SEPLOS BMS CAN RS485 8-16S LiFePO4 Batterie Management System 100A Dis User Manual

SEPLOS BMS CAN RS485 8-16S LiFePO4 Batterie Management System 100A Dis

Product Information

Cell/ambient/MOSFET temperature detection
Charging/discharging current detection
Short circuit protection
Pack capacity and cycle life calculation
Charging/discharging MOSFET
LED indicator for status and fault indication
Standby mode with auto sleeping function
Power on/off with master pack
CAN/RM485/RS485 interface for communication
Battery information storage

Product Usage Instructions

1. Cell and pack voltage detection: The BMS can detect the voltage of individual cells as well as the overall pack voltage.
2. Cell/ambient/MOSFET temperature detection: The BMS can detect the temperature of cells, ambient environment, and MOSFET.
3. Charging/discharging current detection: The BMS can detect the current during charging and discharging processes.
4. Short circuit protection: The BMS features short-circuit detection and protection function.
5. Pack capacity and cycle life calculation: The BMS can calculate pack capacity and estimate cycle life.
6. Charging/discharging MOSFET: The BMS uses low impedance, high current MOSFET for optimized power-on, zero  handoff, and charging voltage withstanding for large capacitive loads backup power supply.
7. LED indicator: There are 6 LED indicators, including 4 white LED indicators for SOC status, 1 red LED indicator for warning, protection, and fault indication, and 1 white LED for battery standby, charging, and discharging status.
8. Standby mode: The BMS features auto sleeping  function. It can enter standby mode automatically if the battery didn’t charge/discharge for 48 hours or if the battery is in discharge protection status and maintains communication for 1 minute. It can also be manually put into standby mode by holding the ‘reset’ button for 6 seconds.
9. Power on/off with master pack: When battery packs are connected in parallel, the BMS can be powered on/off together with one-click if the DIP address is correctly set.
10. CAN/RM485/RS485 interface: The BMS supports communication through CAN, RM485, and RS485 interfaces.
11. Parallel communication: Battery packs can be connected through RS485 interface. The paralleled packs information can be checked by connecting them with a master computer or by connecting the master pack with an inverter via CAN/RM485 interface.
12. Battery information storage: The BMS saves data information whenever the battery system changes status, including warning, protection triggering, and other relevant data.

Application

This is the full-featured Battery Management System (BMS) that designed to monitor 16s LFP battery pack. The BMS offers protection and recovery to individual cell over/under voltage, pack over/under voltage, charge/discharge over current, high/low temperature and short circuit. And accurately calculates the SOC and SOH status. As well as keeps voltage balancing during charging and discharging. And could also monitors parameter settings and data through computer via RS485 interface. (Baud rate 19200. )

Features

• Cell and pack voltage detection
  By detecting the cell voltage in real-time, BMS provides over/under voltage warnings and protections. At the temperature of 0～45℃, the measured voltage difference is about ±10mV. While at the temperature of -20～0℃ and 45～70℃, the measured voltage difference is ±30mV. The warning and protection threshold value can be configurable through software.

• Cell/ambient/MOSFET temperature detection
  By detecting the temperature of cells (4 of the 16 cells), ambient temperature, and temperature of PCB board in real-time via NTC, BMS provides high/low temperature warnings and protections. The measured difference is ±2℃.
  Cell temperature sensor NTC value is 10KΩ, and B-value at 3435.
  The warning and protection threshold value can be configurable through software.

• Charging/discharging current detection
  With the current sense resistors in the charging/discharging circuit, BMS detects and monitors the the input and output current in real-time, and provides over current warnings and protections. When the temperature rise is less than 40℃, the measured accuracy is up to ±1%.
  The warning and protection current threshold can be configurable through software.

• Short circuit protection
  BMS features short-circuit detecting and protecting function.

• Pack capacity and cycle life calculation
  BMS calculates the remaining capacity in real-time. The BMS get the capacity at the first time when the battery pack complete a full charging and discharging cycle. And the SOC calculating accuracy is ±5%.
  BMS counts the number of how many charging/discharging cycles a battery has experienced as aging. When the accumulated discharge capacity is equal to 80% of the design capacity. The cycle count increases.
  The capacity parameters can be configurable through software.

• Charging/discharging MOSFET
  Low impedance, high current MOSFET is the optimized design for the power-on, zero handoff and charging voltage withstanding for large capacitive loads backup power supply.
  When in charging or standby status, each cell can be equalized. Which will greatly increases battery life span and cycle life. The voltage and voltage difference threshold value can be configurable through software.

• LED indicator
  There are 6 LED indicators. 4 white LED indicators for SOC status. 1 red LED indicator for warning, protection, and fault indicating. And 1 white LED for battery standby, charging and discharging status.

• Standby mode
  BMS features auto sleeping function.

Automatically standby:

• If the battery didn’t charge/discharge for 48 hours. The BMS will enter standby mode automatically.
• If the battery is in discharge protection status, and maintains communication for 1 minutes. The BMS will sleeping automatically.

Manually standby:

• Hold the ‘reset’ button for 6 seconds. The indicators lighten in order. And the BMS enters into sleeping.
• To disconnect the external switch, the battery pack will entering standby mode.

Sleeping mode function is configurable through software.

Power on/off with master pack
Paralleled battery packs could be powered on with one-click. When the battery packs are connected in parallel, BMS needs to setup address via DIP switch. If the DIP address is correctly set, power on/off the master pack, all the slave packs can be powered on/off together. (If each pack with different voltage, and there’s current output between the paralleled packs, slave packs cannot be powered off.)

CAN/RM485/RS485 interface
CAN BUS could realize communication between battery and inverter. And CAN communication has different protocol according to different inverters. (Seplos Default CAN protocol is compatible with Pylontech, Goodwe, DEYE, TBB, protocol. To switch protocols through software, there are optional Growatt, Victron, SMA, Sofar, Solis, and Studer protocols.)
RS485 communication could realize communication between battery and inverter. And CAN communication has different protocol according to different inverters. (RS485 could recognize the Pylontech, Growatt, and SRNE protocol )
RS485 communication could realize data monitoring, operation controlling and parameter setting through computer or other devices via telemetering, telesignalization, remote regulating and remote control commands.

Parallel communication
Connect the battery packs through RS485. And setup address with 8 DIP switches.
Two ways to check the paralleled packs information:

• Connected the paralleled packs with RS485 interface. Then contented with master computer.
• Connected the paralleled packs with RS485 interface. Then connect the master pack with inverter via CAN/RM485 interface.

Battery information storage
Each time the battery system changes status, BMS will save the data information, which including warning, protection triggering and releasing data. BMS can also save the data information of a certain period of time by setting start time, end time and time interval. Up to 300 historical data can be recorded and stored. And all the data can be read, and save as excel through master computer.

Battery parameter configuration
Voltage of individual cell, total voltage, charging and discharging over current, high or low temperature of cell and ambient, cell balancing and equalization, the numbers of cells in series, battery capacity and other battery management parameters can all be configurable through software.

Battery function configuration
Manage voltage, temperature, and current related monitoring and controlling functions, as well as capacity calculating function through software.

Precharge
The pre-charge function will be activated at the moment when BMS or discharge MOSFET powered on. The pre-charge time range is 1mS -5000mS. This function will effectively protect BMS from short circuit. And it is specially designed for the application of capacitive load.

Dry contact
BMS features two circuit of dry contact output for,

• SOC warning and protection, low voltage warning and protection, temperature abnormal warning and protection, over charging/discharging warning and protection, over voltage warning and protection.
• Temperature sensor failure warning, cell voltage difference failure, transience over current protection, short circuit protection, and cell over voltage protection + 30mV.

Aerosol supportable
BMS supports abnormal information transmit via aerosol dry contact and remind customer about the abnormal status.

Bluetooth
We can monitor and configure the functions, parameters, and warning information through Bluetooth APP.

• Battery information
• The communication between BMS and inverter
• Warning status, parameters, and function switch configuration
• Paralleling information
• English version available

Compensation
Long copper bus bars, or wires would cause large voltage difference. If the voltage difference is too large, check the connectors between the two cells. The voltage difference caused by long bus bars and wires could set voltage compensation through upper computer system. Check the voltage difference between the long bus bars, or wires when discharging, and calculate the resistance compensation according to resistance=voltage difference/current. And set the resistance value with upper computer system. The default resistance compensation is between the anode of 9th battery and cathode of 13th battery. Another two resistance compensation reserved for special occasions.
Note: Please confirm with SEPLOS before setting the resistance compensation value to ensure the consistency of cells.

Charging current limiting
There are two kinds of current limitation to meet different needs. That is active current limitation and passive current limitation.

• Active current limitation:
  When at the charging status, the current limitation MOSFET keeps being connected. And the charging current will be limited to 10A.

• Passive current limitation:
  When at the charging status, the charging MOSFET keeps being connected. Once the charging current reaches over current warning threshold (The default threshold value is 100A.), the charging current limitation will be activate. And the charging current will decrease to 10A. BMS will detect the charging current every 5 minutes, and check whether the charging current could activate passive current limitation.(The default passive current limitation threshold is edible. )

Automatically identification
If the automatically identification functions switched on, each paralleled battery pack can distribute identifications according to wiring connections. No need to dial DIP switches.

BatteryMonitor software
Software name is BatteryMonitor. It is available in Chinese and English version. (Load the corresponding language agreement.) Check the installation guide for installation.
Download the software with this link:
https://drive.google.com/drive/folders/10pxgNLHovcDZRVGrCZsSkfecBrRw-AdW?us p=sharing

Firmware updating
Upgrade the firmware via RS485 interface.

Diagram

Electrical features

Basic parameter

Parameter setting
Individual cell over voltage parameters

Individual cell over voltage parameter

Functions| Status| Item| Default| Configurable Range

Over voltage warning

|

ON

| Over voltage warning|

3500mV

| Over voltage warning recovery – over voltage protection
Over voltage warning recovery| 3400mV| 3000mV – over voltage warning
Under voltage warning|

2900mV

| Under voltage protection – under voltage warning recovery
Under voltage warning recovery| 3100mV| Under voltage warning – 3300mV

over voltage protection

|

ON

| Over voltage protection| 3650mV| Over voltage warning – 4500mV
Over voltage protection recovery|

3400mV

| Over voltage warning

recovery – over voltage protection

Over voltage recovery condition

|

• Individual cell voltage decrease to over voltage recovery threshold.
• The remaining capacity lower than 96% of the intermittent power supply.

Both conditions should be satisfied.

|

Output current ≥1A

Individual cell low voltage parameters

Individual cell low voltage parameter

Functions| Status| Item| Default| Configurable Range
under voltage protection|

ON

| Under voltage protection| 2700mV| 1500mV – under  voltage protection recovery
Under voltage protection recovery| 2900mV| Under voltage protection – under voltage warning

Under voltage protection condition

| When an individual cell gets under voltage protection threshold, BMS maintain communication with inverter for 1 minutes and powered off.
Under voltage protection recovery| Input current≥1A

Pack over voltage parameters

Pack over voltage parameter

Functions| Status| Item| Default| Configurable Range

Over voltage warning

|

ON

|

Over voltage warning

|

56.0V

| Over voltage warning recovery – over voltage protection
Over voltage warning

recovery

|

54.0V

|

53.0V – over voltage warning

Under voltage warning| 46.4V| Under voltage protection – under voltage warning recovery
Under voltage warning recovery|

48.0V

| Under voltage warning – 55.0V
Over voltage protection|

ON

| Over voltage protection| 57.6V| Over voltage warning – 60.0V
Over voltage protection

recovery

|

54.0V

| Over voltage warning recovery – over voltage protection
Over voltage protection recovery conditions|

• Individual cell voltage decrease to over voltage recoverythreshold.
• The remaining capacity is lower than 96% of the intermittent power supply.

Both conditions should be satisfied.

| Output current≥1A

Pack low voltage parameters

Pack low voltage parameter

Functions

|

Status

|

Item

|

Default

|

Configurable Range

Under voltage protection

|

ON

|

Under voltage protection

| 41.6V| 36.0V – under voltage warning recovery
Under voltage protection recovery|

46.4V

| Under voltage protection – under voltage warning

Under voltage protection condition

| When the total voltage gets under voltage protection threshold, BMS maintain communication with inverter for 1 minutes and

powered off.

Under voltage protection recovery conditions|

Input current≥1A

Cell high/low temperature (charging) parameters

Cell high/low temperature (charging) parameters

Functions

|

Status

|

Item

|

Default

|

Configurable Range

Cell temperature (Charging)

|

ON

| High temperature warning|

50℃

| High temperature warning recovery – high temperature protection
High temperature warning recovery|

47℃

| 35℃ – high temperature warning
High temperature protection (charging)| 55℃| High temperature protection

recovery – 80℃

High temperature protection recovery|

50℃

| High temperature warning recovery – high temperature

protection

Low temperature warning

|

2℃

| Low temperature protection –

low temperature warning recovery

Low temperature warning recovery

(charging)

|

5℃

|

Low temperature warning – 10℃

Low temperature protection|

-10℃

| -20℃ – low temperature

protection recovery

Low temperature protection recovery

|

0℃

| Low temperature protection – low temperature warning

recovery

Cell high/low temperature (discharging) parameters

Cell high/low temperature (discharging) parameters

Functions

|

Status

|

Item

|

Default

|

Configurable Range

Cell temperature (Discharging)

|

ON

| High temperature warning| 52℃| High temperature warning recovery

– high temperature protection

High temperature warning recovery

|

47℃

| High        temperature        protection recovery – 80℃
High temperature protection| 55℃| High temperature warning recovery

– high temperature protection

High temperature protection recovery

|

50℃

|

High temperature warning recovery

– high temperature protection

Low temperature warning

|

-10℃

| Low temperature protection – low temperature warning recovery
Low temperature warning recovery|

3℃

| Low temperature warning – 10℃
Low temperature protection| -15℃| -30℃ – low temperature protection recovery

Ambient high/low temperature parameters

Ambient high/low temperature parameters

Functions

|

Status

|

Item

|

Default

|

Configurable Range

Ambient temperature

|

ON

| High temperature warning| 50℃| High temperature warning recovery – high temperature protection
High temperature warning recovery| 47℃| -20℃ – high temperature warning recovery
High temperature protection| 60℃| High temperature protection recovery -80℃
High temperature protection recovery| 55℃| High temperature warning recovery – high temperature protection
Low temperature warning| 0℃| Low temperature protection – low temperature warning recovery
Low temperature warning recovery|

3℃

|

Low temperature warning – 60℃

Low temperature protection| -10℃| -30℃ – low temperature protection recovery
Low temperature protection recovery|

0℃

| Low temperature protection – low

temperature warning recovery

MOSFET high/low temperature parameters

MOSFET high/low temperature parameters

Functions

|

Status

|

Item

|

Default

|

Configurable Range

MOSFET

temperature

|

ON

| High temperature warning|

90℃

| High temperature warning recovery – high temperature protection
High temperature warning recovery|

85℃

|

60℃ – high temperature warning

High temperature protection|

100℃

|

High temperature warning – 120℃

High temperature protection recovery|

85℃

| High temperature warning recovery – high temperature protection

Charging current limiting parameters

Charging current limiting parameters

Functions

|

Status

|

Item

|

Default

|

Configurable Range

Current limiting (charging)

|

OFF

|

Active current limiting

|

10A

| When the charger current＞10A, current limiting activated.

ON

|

Passive current limiting

| When the charger current＞charging over current warning (configurable), current limiting activated.

Charging current limiting time delay

|

5 min

|

After the current limiting being activated, BMS re-check the current to judge whether to maintain current

limiting.

Charging over current parameters

Charging current limiting parameters

Functions

|

Status

|

Item

|

Default

|

Configurable Range

Over current warning (charging)

|

ON

|

Over current warning

|

105A

| Charging over current warning recovery –

charging over current protection

Over current warning recovery|

103A

|

0A – charging over current warning

Over current protection (charging)

|

ON

|

Over current protection

|

110A

|

0A~150A

Over current protection time delay|

10S

|

Configurable

Over current protection recovery conditions|

BMS detects any output discharge current.

After 60 seconds, the protection recovers automatically.

Effective

charging current

|

Charging current (in)

|

600mA

Charging current (out)

|

500mA

Discharging over current parameters

Discharging over current parameters

Functions

|

Status

|

Item

|

Default

|

Configurable Range

Over current warning

|

ON

|

Over current warning

|

-105A

| Over current protection – over current

warning recovery

Over current warning

recovery

|

-103A

|

Over current warning -0A

Over current protection

|

ON

|

Over current protection

|

-110A

|

Transient over current protection – 0A

Over current protection time delay|

10S

|

Configurable

Over current protection recovery conditions| 1.    BMS detects any inputcharge current.

2.    After 60 seconds, the protection recovers automatically.

Transient over current parameters

Transient over current parameters

Functions| Status| Item| Default| Configurable Range
| | Over current protection| -250A| Discharge over current protection – 300A
| | Over current protection time delay| 30mS| Configurable
| ON| | BMS detects any input charge current.
Over| | Over  current  protection| After 60 seconds, the protection recovers
current protection| | recovery| automatically.
| |
(Transient)| | Over current lock|  Continuously over current for 2 times.
| | |  The over current lock times exceeded.
| OFF| Over current lock times| 5 times
| | Over current lock release| Connected with charger

Short circuit parameters

Short circuit parameters

Functions| Status| Item| Default| Configurable Range
Short circuit protection|

ON

| Short circuit protection current value and time delay|

• Programmed into the software (can not be edited)
• Cannot be turned off

Short circuit protection recovery| BMS detects any input charge current.
After 60 seconds, the protection recovers automatically.
ON|

Short circuit protection lock

|

• Continuously short in the output circuit.
• The over current protection lock times exceeded.

Short circuit protection lock times| 5 times
Short circuit protection lock release| Connected with charger
Effective discharging current| Discharge current (in)| -500mA
Discharge current (out)| -400mA

Cell balance parameters

Short circuit parameters

Functions

|

Status

|

Item

|

Default

|

Configurable Range

Cell balance

|

ON

|

Standby balance

| When there is no charging and discharging current flow,

the standby equalization will be activated.

Standby time

|

10 hours

|

configurable

ON

|

Charging equalization

| When at the charging or float charging status, the

charging equalization will be activated.

Balance conditions

|

Activate voltage

|

3350mV

|

Configurable

Activate voltage difference|

30mV

|

End voltage

|

20mV

|

ON

|

Temperature

| According to the temperature range of no equalization (ambient temperature)
No equalization high temperature|

50℃

|

Configurable

No equalization low temperature|

0℃

Cell failure

|

ON

| Voltage difference|

500mV

|

Configurable

Voltage difference recovery|

300mV

Cell balance parameters

Capacity parameters

Capacity

|

Nominal capacity

|

100AH

|

5-300Ah

Remaining capacity

|

Calculated accordingly to the cell voltage

|

Configurable

Cycle life accumulated capacity|

80%

|

Cycle life (configurable)

ON

| Remaining capacity warning|

15%

ON

| Remaining capacity protection|

5%

| Output current flow

will be cut off.

Other parameters

Pre-charging

|

2000ms

|

0-5000ms

| The pre-charging function will be activated once the BMS powered on.
---|---|---|---
BMS      power consumption|

ON

| Longest standby time| 48 hours (Do not connected with charger, and no effective charging current.)

Heating

|

ON

| Start heating temperature|

0℃

|

Configurable

Stop heating temperature|

10℃

|

Heating function activation

| When connected with charger, and the cell temperature reaches the setting value, the heating function activated. Heating function disabled when at standby and discharge

status.

External

switch

|

OFF

| When at the standby status, the BMS can be powered on/off through external switches.

LCD screen

|

ON

| Monitoring software to check the cell voltage, temperature and current.

Charging activating

|

ON

|

1 minutes

| The BMS powered off after under voltage protection. Press the button for recovering from protection status and

activate output current.

|

Configurable

Compensating impedance|

Compensation 1

| 0mΩ| 9|

Configurable

Compensation 2

| 0mΩ|

13

Working mode
Charging mode
When a charger was detected, and the charger voltage is 0.5V+ more than the battery voltage, BMS will turn on the charging MOSFET. And when the charging current reaches the effective charging current value, BMS enters charging mode. At charging mode, charging and discharging MOSFET are both turned on.

Discharging mode
When a loads was detected, and the discharging current reaches the effective charging current value, BMS enters discharging mode.

Standby mode
When the BMS not in charging mode, nor discharging mode, it enters standby mode.

Power off mode
When the battery standby for 48 hours, and the battery is in under voltage protection status, or to press the reset/external switches, then the BMS will enter power off mode.
BMS activation conditions:

1. Charging to activate
2. Activate with 48V voltage
3. Press the power switches

LED indicator
LED lights
One running indicator (Green) One warning indicator (Red)
And four capacity indicator (Green)

| | | | |
---|---|---|---|---|---
SOC| ALARM| RUN

Capacity indicators

Lights blinking explanation A

Running status indicators

SYSTEM

|

RUNNING

|

RUN

|

ALM

|

SOC

|

REMARK

---|---|---|---|---|---
| | | | |

OFF

|

SLEEPING

|

OFF

|

OFF

|

OFF

|

OFF

|

OFF

|

OFF

|

OFF

STANDBY

|

RUNNING

|

Blink A

|

OFF

|

OFF

|

OFF

|

OFF

|

OFF

|

Standby

CHARGE

|

RUNNING

|

Green

|

OFF

|

According to the remaining

capacity

|

LED Blink B

Over current

warning

|

Green

|

Blink B

|

According to the remaining

capacity

|

LED Blink B

Over voltage

protection

|

Blink A

|

OFF

|

OFF

|

OFF

|

OFF

|

OFF

|
Temp. And over

current protection

|

Blink A

|

Blink A

|

OFF

|

OFF

|

OFF

|

OFF

|

DISCHARGE

|

RUNNING

|

Blink C

|

OFF

|

According to the remaining

capacity

|

warning

|

Blink C

|

Blink C

|
Temp. Over current, short circuit

protection

|

OFF

|

RED

|

OFF

|

OFF

|

OFF

|

OFF

|

Under voltage

protection

|

OFF

|

OFF

|

OFF

|

OFF

|

OFF

|

OFF

|

No discharge

Function intoduction

Standby
When the BMS is well-connected, and the battery is not in over/under voltage, over current, short circuit or high/low temperature protection status, press the reset button to activate the BMS. Then the LED indicator lighten in order. And the BMS is in standby status.
At standby status, the running indicator blinks. And the battery pack can be charged and discharged.

over charging protection and recovery
Cell over charging protection and recovery
When an individual cell voltage exceeds the setting over charging protection threshold, BMS enters over charging protection status. And the battery can not be charged.
Conditions to release the over discharge protection status.

• When the cell voltage decreases to individual cell over charging recovery threshold, and the SOC is lower than 96%.
• When connected with loads.
• Pack over charging protection and recovery

Conditions to release the over discharge protection status.

• When the cell voltage decreases to individual cell over charging recovery threshold, and the SOC is lower than 96%.
• When connected with loads.

over discharging protection and recovery
Cell over discharging protection and recovery
Whenever an individual cell voltage lower than the over discharge protection threshold, BMS enters over discharge protection status. And the battery can not be charged. After maintaining communication with inverter for one minutes, the BMS will power off.
BMS can be activate by pressing reset button, or charging. And BMS will detects the voltage and check whether the voltage reaches the recovery threshold.

Pack over discharging protection and recovery
When the pack total voltage decrease to the over discharging protection threshold, discharging MOSFET will be disconnected and battery pack can not be discharged. The BMS enters over discharge protection status. After maintain communication for one minutes, BMS will shut off automatically.
BMS can be activated by pressing ‘reset’ button or charging. After being activated, BMS detects the pack total voltage, and check whether the total voltage reach the recovery threshold.

Charging over current protection and recovery
If the charging limitation function is turned off, the charging over current protection will be activated once the charge current being too large. When charging current value exceeds the setting over current threshold, and with enough the time delay, BMS enters charging over current protection. And the battery can not be charged.
Two ways to recover from charging over current protection.

• BMS will recover charging automatically after a certain time (default time). And detects the charging current value at the same time to check whether the current value reaches recovery threshold.
• Charging over current protection can be released by discharging.

Discharging over current protection and recovery
When the discharging current exceeds over current protection threshold, and with enough time delay, BMS enters discharging over current protection. And the battery can not be discharged.
BMS will recover discharging automatically after a certain time (default time). And detects the discharging current value at the same time to check whether the current value reaches recovery threshold.
For discharging over current protection, there’s transient current and discharge current. The recovery condition is the same. But when the transient over current protection times reaches the lock time threshold, only charging or restarting could release the protection.

Temperature protection and recovery
There are six temperature sensing leads to detects and monitors the temperature in real-time.

High temperature protection and recovery
When at the discharging status, any cell temperature (There are four NTC for cell temperature detecting.) exceeds the high temperature protection threshold, BMS enters high temperature protection status. And the battery can not be charged or discharged.
When detecting the cell temperature decreased to high temperature recovery threshold, BMS recovers charging/discharging functions.

Low temperature protection and recovery
When at the charging status, any cell temperature decreased to the low temperature protection threshold, BMS enters low temperature protection status. And the battery can not be charged or discharged. When detecting the cell temperature exceeds the low temperature recovery threshold, BMS recovers charging/discharging functions.

Ambient temperature and MOSFET temperature
When detecting the ambient temperature exceeds ambient temperature warning threshold, BMS enters high temperature warning status. When detecting the MOSFET temperature exceeds the MOSFET temperature protection threshold, BMS enters Mosfet high temperature protection status.

Cell balance
BMS could balancing individual cell at standby and charging mode through power consumption circuit. When any individual cell voltage is higher than equalization start voltage and the voltage difference exceeds the threshold, the equalization circuit flows. The equalization start voltage threshold is configurable.
When connected with charger or the voltage difference lower than setting threshold, equalization stops.

Power on/off

mode. The LED indicators will be lighten one by one. Then the BMS enters running status.
2| Power off/Sleep| BMS will enter sleep mode if hold the reset button for 3 seconds at standby or discharging mode. The LED indicators will blink one by one. Then enters sleep mode.

Storage
BMS comes with data storage module, the data includes protection and warning status, protection and warning recovery time, individual cell voltage, pack cell total voltage, charging/discharging capacity, current and temperature. BMS could record the information of a certain period of time through upper computer system. No less than 300 pieces of information can be stored. And all the data can be saved into your computer as excel files.

Size and dimension

Appearance

Wire introduction

Wire Harness A (Black connector)

| ****

CELL1-

| ****

The negative terminals of 1st cell

CELL1+

| ****

The positive terminals of 1st cell

CELL2+

| ****

The positive terminals of 2nd cell

CELL3+

| ****

The positive terminals of 3rd cell

CELL4+

| ****

The positive terminals of 4th cell

NTC1+

| ****

The temperature sensor NTC1

NTC1-

| ****

The temperature sensor NTC1

CELL5+

| ****

The positive terminals of 5th cell

CELL6+

| ****

The positive terminals of 6th cell

CELL7+

| ****

The positive terminals of 7th cell

CELL8+

| ****

The positive terminals of 8th cell

NTC2+

| ****

The temperature sensor NTC2

NTC2-

| ****

The temperature sensor NTC2

Wire Harness B (White connector)

| ****

CELL9-

| ****

The negative terminals of 9th cell

CELL9+

| ****

The positive terminals of 9th cell

CELL10+

| ****

The positive terminals of 10th cell

CELL11+

| ****

The positive terminals of 11th cell

CELL12+

| ****

The positive terminals of 12th cell

NTC3+

| ****

The temperature sensor NTC3

NTC3-

| ****

The temperature sensor NTC3

CELL13+

| ****

The positive terminals of 13th cell

CELL14+

| ****

The positive terminals of 14th cell

CELL15+

| ****

The positive terminals of 15th cell

CELL16+

| ****

The positive terminals of 16th cell

NTC4+

| ****

The temperature sensor NTC3

NTC4-

| ****

The temperature sensor NTC3

Wiring
Connection: B- → WIRE HARNESS A → WIRE HARNESS B → B+ → P+ → charger/loads → P- (After wiring, press the reset button to activate the BMS.)
Disconnection: unconnected charger or loads, turn off the BMS and disconnect WIRE HARNESS B → WIRE HARNESS A → B-

Input and output:
Charging: Connect the positive of charger with BMS P+, and the negative of the charger with BMS P-.
Discharging: Connect the positive of loads with BMS P+, and the negative of the loads with BMS P-.

 Communication introduction

CAN and RM485
BMS transmit information through CAN interface. Buad rate 500KBITS/S. CAN interface applies 8P8C connectors. And CAN connector communicates with inverter or CAN TEST. RS485 collect the information. Then CAN transmit the battery pack information to PCS.

CAN connector definition:

RS485
BMS could collect battery pack information through RS485 communication.
Baud rate: 19200bps. RS485 interface applies 8p8c connectors.
RS485 connectors definition:

Parallel
When connected in parallel with RS485 connectors. CAN connectors act as upper communication interface. End devices could get the collected battery information through CAN interface.
RS485 connector connection:

DIP switch
DIP ADDRESS: If the battery packs is connected in parallel, the DIP address identifies each pack with different addresses.
Bit 1 to 4 for different address of paralleled packs. Bit 5 to 8 for the quantity of slave packs. Check Appendix for details.

Auto-identification

 LCD screen

Safety precautions

• The BMS can not be connected in series.
• The components of the BMS withstand voltage of 100V most.
• Do not connect the external switch with other devices without permission. Or SEPLOS will not responsible for any damage that cause.
• Do not make any contact with the surface of battery cell when installing. Or the cell may be damaged.
• Do not make any contact with the components of the PCB. Or the PCB may be damaged.
• Operating at dry and dust free room.
• Check if the BMS is correctly connected if no voltage input and output after instillation.
• Follow the guidance and use of conditions specified in the data sheet.
• All right reserved.

©2022 SEPLOS Technology
Room 301, Building 6, No. 179 Kangyi Road, Qingxi Town, Dongguan, Guangdong, China
TEL : (86) 15079804024
E-mail: info@seplos.com
Site: www.seplos.com

References

• Energy Storage Battery Manufacturer – Seplos Technology

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