How to choose a good and suitable BMS ?

Date: 2022-11-23 17:55:24Downloads: 381

A good bms needs high-quality components, reasonable PCB wiring and peripheral circuit design,

Same port or difference port ？ How to choose?

If it's just an ordinary battery pack, I suggest you still use the difference port. Why?

1. The price is cheaper because BMS manufacturer can use less Charge MOS, The cost of MOS is main cost of BMS

2. More importantly, there is no charge MOS when discharging from P -, You know the MOS raise high temperature, So the temperature will be lower than same port BMS.

3. Circuit reliability, (designed by the same engineer)

I suggest using the same port only in the following cases:

1. There are mutual charges but they have to be used in parallel...

2. Charge and discharge at the same time.

Precautions for BMS installation

No matter which manufacturer's BMS, You only need to connect B - (battery), P - (discharge cathode), C - (charge cathode) and single wire,

The sequence of BMS wiring should be:

1. Be clear about the sequence of several B - P - C - and flat wires, especially where the first one is connected...

2. Weld the B - P - C wires in advance, and do not weld them when they need to be connected. The position is not easy to weld

3. The flat wire is connected as expected at the time of series parallel connection

4. Confirm that the cable arrangement is as expected at 100% (confirm whether the voltage and sequence are OK under the multimeter)

5. Insert the flat cable into the protection plate, measure the voltage of P+(battery positive pole) and B - P+, P - P+and C - to see if they are consistent, and they should be the same under normal conditions

6. Glue and reinforce the row plug to avoid looseness, and fix the protective plate (the protective plate and the battery should not be directly attached to the battery, or the heat transmission should be balanced).

First connect the B-cable of the protection board to the total negative pole of the battery pack

The cable starts from the thin black one connecting B-, the second red cable connects the positive pole of the

first string of batteries, and the next string is connected in turn.The positive pole of the pool; then insert the

cable into the protection board

After finishing the wiring soldering, measure whether the battery B+, B-voltage and P+, P-voltage values are

the same, only same, the protection board works positively.otherwise please follow the above re-operation;

When removing the protection board, first pull out the cable (if there are two cables, pull the high-voltage cable

first, then pull the low-voltage cable), then remove Power cable B-.

Software board connection order

After confirming the welding is correct, the accessories with the product (e. g.: temperature control standard /

battery panel selection / Bluetooth optional / GPS optional / display selection / customized communication

interface selection) are installed on the protective panel, and then the row line is inserted into the protective

panel socket; the blue B-line on the protection board connects the total negative electrode of the battery and

the black P-line to the negative electrode of charge and discharge.

The protection board requires activation for the first time Method:

Method 1: the SOC indicatorActivation, the electricity board above is to have an activation button.

Method 2: Charge and activate.

Method 3: Bluetooth Activation

Parameter modification

The serial number of the protective plate and the protective parameters (Ternary and iron lithium) have the

default value when they leave the factory, but the capacity of the battery pack should be set according to the

actual capacity AH of the battery pack. If the capacity AH is not set correctly, then the percentage of the

remaining power will be inaccurate, the first use of the full 100% as a calibration, other protection parameters

can also be set according to the customer’s own needs (do not recommend any changes to the parameters) .

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