BMS function allocation under the trend of in-vehicle electronic integration

Lin Xuechang is talking about the evolution of the function of BMS, will it evolve into the VCU/HCU of the vehicle/hybrid controller. I think this is worth discussing. First let's take a look at the battery structure of VW.

The high probability here is that the battery management system detects a high current pulse and then protects it. The level of this fault defines a high price.

When we consider this matter, we can take a look at the structure of the German system. In fact, it belongs to the battery management system to a relatively high level (BMS main module ASIL C).

I think that many algorithms of BMS can be directly placed in the VCU. We do the following analysis:

a) Measurement function:

1) Basic information measurement: battery voltage, current signal monitoring, battery pack temperature detection The battery management system has the most basic function is to measure the battery cell voltage, current and temperature, which is the top calculation and control logic of all battery management systems. basis.

2) Insulation resistance detection: Insulation testing of the entire battery system and high voltage system is required in the battery management system.

3) High-voltage interlock detection (HVIL): used to confirm the integrity of the entire high-voltage system, when the high-voltage system loop integrity is damaged, start safety measures.

b) Estimation function

1) SOC and SOH estimation: the core is also the hardest part

2) Equilibrium: When there is a SOC&TImes between the cells; when the capacity is not balanced, the adjustment is performed by the equalization circuit.

3) Battery power limitation: The battery has a certain limit on the input and output power at different SOC & temperature.

c) Other functions

1) Relay control: including main +, main -, charging relay +, charging relay -, pre-charge relay

2) Thermal control

3) Communication function:

4) Fault diagnosis and alarm

5) Fault tolerant operation

For detailed, you can see the following picture:

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