What is an electric vehicle BMS battery management system?

2021-10-09 09:10:34 0

What is BMS battery management system

The battery management system is an electronic device that can monitor and manage the battery. Through the collection and calculation of parameters such as voltage, current, temperature, and SOC, it controls the charging and discharging process of the battery to realize the protection of the battery and improve the integration of the battery. Performance management system.

Why do lithium batteries need BMS battery management system

Safety requirements:

1. An over-discharge will cause permanent damage to the lithium-ion battery.

2. In extreme cases, overheating or overcharging of the lithium battery will cause thermal runaway, and the battery may rupture or even explode.

3. BMS is required to strictly control the charging and discharging process to avoid battery overcharging, overdischarging, and overheating.

Functional Requirements:

1. It is necessary to know the remaining power and other parameters of the lithium battery during the reuse process, and the BMS can correctly display the remaining power through the SOC prediction.

2. BMS can improve the inconsistency of battery cells through equalization and improve the performance of the entire lithium battery pack.

3. The battery will have different working performance under the temperature that the battery does not pass. The best working temperature of the lithium battery is 25~40℃. The BMS battery management system can detect the temperature of the battery pack. If the temperature exceeds the safe temperature, the battery pack can be disconnected from charging and discharging. .

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Functions of BMS

1. Single battery voltage collection

2. Single battery temperature collection

3. Battery pack current detection

4. SOC measurement of the remaining power of the cell/battery pack

5. SOH evaluation of battery pack

6. Charge and discharge balance function of the battery pack

7. Insulation detection and leakage protection

8. Thermal management control and communication

9. Key data record

10. Battery pack failure analysis and online alarm

label: BMS for car BMS