What is the relationship between lithium -ion battery capacity and ambient temperature?

　　The safe use of lithium -ion batteries under different environmental conditions is tight. In all environments. Temperature has the greatest effect on the charging and discharge function of lithium ion batteries. The electrochemical reactions on the electrode/electrolyte interface are related to the ambient temperature. The interface of the electrode/electrolyte is regarded as the blood of the lithium ion battery.

　　If the temperature decreases, the response of the electrode will also decrease: Assume that the voltage of the lithium -ion battery remains stable and the discharge current decreases. The power output of the lithium -ion battery will also decrease. If the temperature rises, the opposite. That is, the output power of lithium ion batteries will rise. Temperature also affects the transmission speed of the electrolyte. The temperature rises accelerated, and the temperature decreases slowly: the charging and discharge function of the lithium -ion battery will also be affected. But the temperature is too high. It will destroy the chemical balance in the lithium -ion battery. If a single lithium -ion battery of 20AH is used as an example, a normal environmental test:

　　1. When the lithium -ion battery is fully electric, it is stored in a low -temperature test box with an environment at a (202) ° C for 20 hours. Under (102) ℃ environmental conditions, the current is discharged at a current of 1 ⅳA. Until the discharge stop voltage 2.OV. The capacity of its lithium ion battery should not be less than 70%of the limited value. After the measurement battery capacity is 20AH. That is, the limited value is declared that at a low temperature of 20 ° C, the capacity value has not changed. Essence

　　2. In a test box with a normal temperature state of the ambient temperature (20_+5) ℃. Lithium -ion batteries are discharged at 1 子A until the discharge stops voltage 2.0V. At this time, this set of batteries is detected. Its capacity value shall not be lower than the limited value or beyond the capacity value. The volume test value is 21AH, which is 105%of the limited value. The statement is in a normal range of the lithium -ion battery in the normal temperature state of (20_+5) ℃.

　　3. In the case of full power of lithium ion batteries, store in a high -temperature test box with a (552) ° C for 5 hours, and then discharge at a current of 1 ⅳ at a (552) ° C, until the voltage of the discharge is stopped 2.0V 2.0V The capacity should not be less than 95%of the limited value. The actual measurement capacity value is 20AH, which is the limited value. The capacity value has not changed at a high temperature of 55 ° C.

　　Although theoretically, the environment has an impact on lithium ion batteries. However, the test statement states that lithium -ion batteries are under the condition of temperature changes. The capacity value has not changed very much. Therefore, changes in the environmental temperature have no impact on lithium ion batteries.

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