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4.2.3 Cooling of batteries

The life and performance of the battery are related to the temperature generated during the use of power batteries and their control. In order to ensure that electric vehicles can also be reliably operated under the strenuous load changes, high -voltage batteries need to be cooled. In addition, the service life of the battery will be shortened with the average temperature of the power battery. In order to ensure the best working state of power batteries, the temperature of the power battery should be kept below 40 ° C. According to the system usage, the battery temperature should not exceed 45-60 ° C.

In various ways, the battery can be cooled. For example, if the internal air cools the power battery, the internal air temperature is controlled by the battery management system, which can be adjusted within a certain range. The sensor can measure the air intake temperature and compare it with the battery temperature. If the air temperature is higher than the temperature of the power battery, the cooling system will be closed.

Another cooling method is to cool the power battery through the air -conditioning system. A evaporator in the system is placed in a battery, and the cooling temperature is adjusted by the battery management system, but this requires the supply system from the air conditioning system and must be operated more frequently.

Another method is water cooling. The typical power battery water cooling system, such as Tesla, adopts this method. Water cooling is a very high -efficiency cooling method. The circuit can maintain relatively stable temperature.

The temperature of the power battery should not be too low when working normally, and some power battery systems will cause a sudden decline in performance in low temperature environments. This phenomenon can be avoided by raising the temperature of the battery. The environmental temperature of the lithium -ion battery has a very important impact on its cycle life. As the temperature decreases, the battery discharge capacity will decrease.

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