The design of the battery thermal management system is the key to improving the life of 18650 2000mah battery

　　The design of the battery thermal management system is the key to improving the life of 18650 2000mah battery. Thermal management of lithium battery systems is an indispensable link to ensure battery safety, extend battery service life, and improve battery system performance. With the leap-forward development of new energy vehicles in recent years, the capacity and size of lithium battery cells have gradually increased, and high-power operating conditions have gradually increased, which has brought severe challenges to the design and optimization of lithium battery thermal management systems.

　　The design of the battery thermal management system is the key to improving the life of 18650 2000mah battery

　　Battery thermal management systems are necessary for most high-power applications and high-temperature batteries. The goal of a thermal management system is to equalize temperatures between cells, cool the cells, and in some cases heat the cells. In a UPS system, equalizing the temperature between cells is the most important function of the thermal management system.

　　In a closed unit containing a rectifier and an inverter, high temperature gradients in the battery are possible. The difference between high and varying temperatures in reducing battery life. Therefore, the design of the button system has a certain impact on battery life. The application of high currents and a closed thermal management system can be used to extend battery life.

　　For the application of heat pipes in lithium battery thermal management systems, the main function is to quickly transfer heat away from the high-temperature system. However, corresponding heat dissipation measures must be used to provide good condensation conditions for the heat pipes, so that the heat pipes can function normally. effect. Therefore, heat pipes can be used as auxiliary efficiency measures for traditional thermal management systems such as air cooling and water cooling.

　　The necessity of battery thermal management system

　　Temperature has a great impact on battery life. For the same battery cell, when the ambient temperature is 23°C, the remaining capacity of the battery is 80% after 6238 days. However, when the battery is exposed to an environment of 55°C, the remaining capacity of the battery has reached 80% after 272 days. When the temperature rises by 32°C, the life of the battery core decreases by more than 95%. Therefore, temperature has a great impact on life. The higher the temperature, the more serious the life span decline.

　　1. Generation of battery heat: Due to the existence of battery impedance, during the battery charging and discharging process, current passes through the battery, causing heat to be generated inside the battery. In addition, a certain amount of heat will be generated due to the electrochemical reaction inside the battery.

　　2. The impact of rising temperature on battery life: rising temperature has an impact on the calendar life and cycle life of the battery.

　　3. Too low or too high temperature will affect the performance and service life of 18650 2000mah battery, so a thermal management system is necessary. According to different heat transfer media, battery thermal management systems can be divided into air cooling, direct cooling and liquid cooling. Liquid cooling has lower cost than direct cooling, and the cooling effect is better than air cooling, so it has a mainstream application trend.

　　The battery supplies power to the motor and the motor drives the load. The heat generated by the battery is exchanged between the coolant and the refrigerant through the heat exchanger between the liquid cooling cycle and the air conditioning system, and then transferred to the engine compartment through the air conditioning system. Finally, the heat is Air is taken away.

　　The main functions of battery thermal management include: accurate measurement and monitoring of battery temperature; effective heat dissipation when the battery pack temperature is too high; rapid heating under low temperature conditions; ensuring the uniform distribution of the battery pack temperature field; and the coordination between the battery cooling system and other heat dissipation units. match.

　　The temperature of the battery directly affects the safety of the battery, so the design research of the battery thermal management system is one of the most critical tasks in battery system design. The design and verification of battery system thermal management must be carried out strictly in accordance with the battery thermal management design process, battery thermal management system and component types, thermal management system component selection, and thermal management system performance evaluation. Only in this way can the performance and safety of the battery be guaranteed.

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