EV battery

Heat generated by reaction during battery charging

by：Vglory 2021-03-24

The important sources of heat after charging are: battery chemical reaction, battery polarization, overcharge side reaction, internal resistance Joule heat. Most of the heat that occurs is due to the side reaction of overcharge. After charging too late and overcharging, side effects of overcharging begin to occur. Important sources of heat during battery discharge are: battery chemical reaction heat, battery polarization heat, and internal resistance Joule heat. It should be pointed out that the chemical reaction of Ni-MH battery discharge is an endothermic reaction, which can absorb part of the heat, so the heating problem is not very serious. The key to the internal resistance of the battery is the policy, which affects the heat generation rate of the battery. It follows the change of the battery SOC. The resistance value in the battery can be obtained through accounting. The internal resistance value of the battery is 12v~80A Ni-MH battery The modules are in different SOCs. Using a specially designed calorimeter can directly measure the heat production of the battery, and can also measure the heat capacity of the battery. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Why does the mobile phone automatically shut down when it is extremely cold?

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