With the rapid development of electric vehicles, energy storage systems, high-voltage battery pack and other fields, lithium batteries, as the main power source, have gradually become the mainstream. In order to ensure the safety and stability of lithium batteries, primary protection and secondary protection are widely used in power batteries in the battery safety protection system. This article will discuss the significance and function of primary protection and secondary protection of lithium batteries in power batteries.

I. Overview of primary protection and secondary protection

1. primary protection: primary protection usually refers to real-time monitoring and protection of basic parameters such as battery voltage and current. When the battery has abnormal conditions such as overcharge, overdischarge, short circuit, etc., the primary protection system will be cut off immediately. Battery connection with external circuit to prevent safety accident of battery.
2. Secondary protection: secondary protection is to further improve the safety performance on the basis of primary protection, usually including monitoring and protecting more parameters such as battery temperature, internal resistance, charge and discharge rate, etc. When the battery temperature rises abnormally, the internal resistance increases or the charge and discharge rate is too fast, the secondary protection system will take corresponding measures, such as reducing the charge and discharge rate and stopping the charge and discharge, to ensure the safe operation of the battery.

II. Application of primary protection and secondary protection in power batteries

1. electric vehicles: in electric vehicles, power battery is the main power source of vehicles, and safety is particularly important. The primary protection and secondary protection system can effectively monitor the battery status, protect the battery from overcharge, overdischarge, short circuit and other problems, and ensure the safe and stable operation of the vehicle.
2. Energy storage system: energy storage system is used to store electric energy and release electric energy when needed, for the safety and stability of the systemThe requirements are also very high. The primary protection and secondary protection systems can effectively monitor the battery status, prevent battery safety accidents and ensure the normal operation of the energy storage system.
3. High voltage battery pack: high voltage battery pack is usually used in industrial equipment, aerospace and other fields, which requires higher safety of batteries. The primary protection and secondary protection systems can monitor the battery status in time to prevent problems such as overheating and short circuit of the battery and ensure the safe use of battery pack.

III. Summary and Outlook

as an important part of battery safety protection system, primary protection and secondary protection play an important role in power batteries. Through real-time monitoring and protection of electricity, it can effectively prevent battery safety accidents and improve the safety and stability of the battery. In the future, with the development of electric vehicles, energy storage systems and other fields, the requirements for primary protection and secondary protection systems will be further improved, and the protection mechanism needs to be continuously improved and optimized to ensure the safety and reliability of batteries.