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　　Definition of battery management system, analysis of lithium battery thermal management system

　　Definition of battery management system, analysis of lithium battery thermal management system. The battery management system can conduct an in-depth assessment of the status of the battery system based on the monitored information. In order to meet the actual operating needs of electric vehicles, the battery management system has made important contributions in terms of functionality, reliability, practicality, and safety. effort. The lithium battery thermal management system is a management system used to ensure that the battery system operates within a suitable temperature range from a user perspective.

　　Battery management system definition

　　As we all know, the basis of management is a comprehensive grasp of real information. Therefore, sensitive sensing capability is the prerequisite for the battery management system to achieve optimal control. Only by fully understanding the battery usage can we better manage the battery. The battery management system monitors the voltage of each battery in the system and can identify changes as small as 1mv. The main task of the lithium battery management system is to ensure the design performance of the battery system, which can be broken down into the following three aspects:

　　1) Safety, protect battery cells or battery packs from damage and prevent safety accidents;

　　2) Durability, allowing the battery to operate in a reliable and safe area and extending the service life of the battery;

　　3) Dynamic performance, maintaining the battery working in a state that meets the requirements of the vehicle.

　　The main task of the battery management system is to ensure the design performance of the battery system, including:

　　1) Sense the battery status: read the voltage, current and temperature information of the battery cells;

　　2) Safety: Based on known status information, protect battery cells or battery packs from damage and prevent safety accidents;

　　3) Durability: Make the lithium battery work within a reliable design range, ensure the working temperature and SoC range, and extend the service life of the battery;

　　4) Power and power: Maintain the battery working in a state that meets the requirements of the vehicle, and determine the charging and discharging power of the battery.

　　Lithium battery thermal management system analysis

　　In new energy vehicles, the main goal of the lithium battery thermal management system is to ensure that the lithium battery pack can work within the optimal temperature range. Battery thermal management refers to the temperature control of lithium battery systems through cooling or heating. Different from the thermal management system of traditional automobiles, in the context of new energy vehicles, lithium battery thermal management, motor electronic control thermal management, and other equipment cooling systems together constitute a thermal management system.

　　Battery thermal management is essentially divided into two parts: one is to cool the battery when it is discharged, and the other is to heat and keep the battery warm when it is charging or resting. Under normal circumstances, the battery thermal management system controls the battery temperature in three aspects:

　　When the lithium battery temperature is high, effective heat dissipation is performed to prevent thermal runaway events.

　　When the lithium battery temperature is low, it is preheated to increase the battery temperature to ensure charging and discharging performance and safety at low temperatures.

　　Reduce the temperature difference within the lithium battery pack and prevent overheating.

　　Summary: Lithium batteries are very sensitive to temperature. Too high or too low operating temperature will affect the performance and life of the battery. Effective and compact thermal management systems (TMS) are required to manage their extreme temperature rises.

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