RS485 12V/4S 100A battery protection board, BMS system, electric scooter lithium battery without Bluetooth application

1. Introduction

The standard series BMS is mainly designed for lithium battery packs with 12V and working current less than 120A. This solution uses a low-power high-precision processor matched with a high-precision sampling chip to perform dynamic and intelligent management of the battery pack. This series applies a unique SOC&SOH algorithm, which can evaluate the high-precision SOC of large-capacity battery packs. At the same time, the intelligent dynamic balance ensures the stable operation of the lithium battery and prolongs the battery life

2. Scope of application

12V (4S) lithium battery packaging

3. Features

1) Support RS485 & UART for learning battery information and modifying firmware.

2) Support 2 temperature sensors to monitor the battery pack

3) Coulomb SOC algorithm and online self-learning function to provide accurate SOC

4) Intelligent dynamic balance

5) Support extended Bluetooth module and LCD Display

4. Technical specifications

 Note: The basic protection parameters can be modified by the host computer software!

(Please modify under the guidance of professional engineers!)

5. Function description

5.1 Sleep mode:

When the battery is static for 30s. BMS should be in sleep mode and reduce self consumption. At this point, the charging and discharging mosfets are in conduction mode. Once the battery pack is in charging or discharging state, the BMS should be activated again. In sleep mode, its own power consumption is less than 300uA

Activation method in slee6.p mode: (i) Charge the battery; (ii) Communication activation

Note: 1) When the dynamic balance is turned on, the BMS will not enter the sleep mode

5.2 Over-discharge function (sleep mode)

When the battery pack is in sleep mode and the voltage is lower than the protection value, the BMS will reduce the consumption to the minimum value. The BMS should be off and the self-consumption should be less than 10uA.

The activation method is to charge the battery pack through the charger

6. Product picture and wiring diagram

6.1 BMS picture

6.11 RS485 BMS (8 pairs of Mosfet)

6.12 BMS size

6.2 BMS terminal connection diagram

Note: The battery sampling line needs to be connected to the conversion board, and the B7+(B+), B- wire diameter should be 1.5mm or above

7. PC monitoring software

7.1 Information display (pictures are for reference only)

Display information includes voltage, current, temperature and state of charge (SOC)

7.2. Parameter display and modification (pictures are for reference only)

In the more information interface, you can read and modify battery protection parameters

Note: It is not recommended that customers modify the parameters by themselves

9. Accessories:

9.1 PC connector (size: 80*45*25mm)

     This module is TTL to USB function, can be used to communicate with PC

9.2 Bluetooth module (size: 52*20*10mm)

     9.3 LCD Display