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The secret to improving the low-temperature performance of lithium-ion batteries

Faced with the limited use of lithium-ion batteries at low temperatures, technicians have found a response strategy of charging and preheating. Although it is a temporary measure, it has a significant effect on improving the low-temperature performance of lithium-ion batteries.

Before charging or using lithium-ion batteries in low-temperature environments, they must be pre heated. The Battery management system (BMS) of electric vehicles can generally be divided into two types: external heating and internal heating.

External heating methods include air heating, liquid heating, phase change material heating, as well as thermal resistance heater or heat pump heating. These heating methods are generally located in battery packs or in containers with thermal cycling media. The internal heating method for heating a battery is to excite the electrochemical substances inside the battery through alternating current, causing heat to appear in the battery itself.

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