What effect does ambient temperature have on lithium batteries?
Among all environmental factors, temperature has the greatest impact on the charge and discharge performance of lithium batteries. The electrochemical reaction at the electrode/electrolyte interface is related to the ambient temperature.
If the temperature drops, the reaction rate of the electrode also decreases: assuming that the voltage of the lithium battery is kept constant, the discharge current is lowered. Then the power output of the lithium battery will also drop. If the temperature rises, the opposite is true. That is, the output power of the lithium battery will rise. The temperature also affects the transfer rate of the electrolyte, the temperature rises faster, and the temperature decreases slower: the charge and discharge performance of the lithium battery is also affected. But the temperature is too high. Will destroy the chemical balance in the lithium battery. Lead to side reaction.
1. In a test chamber where the ambient temperature is (20_+5) °C normal temperature. The lithium ion battery was discharged at a current of 1 IVA until the discharge termination voltage was 2.0 V. At this time, the battery was tested. The capacity value should not be lower than the rated value or exceed 110% of the capacity value. The resulting capacity test value is 21 Ah, which is 105% of the rated value, indicating that the lithium ion battery is qualified at (20_+5) °C normal temperature. Within the scope.
2. After the lithium ion battery is fully charged, it will be stored in the low temperature test chamber of environment (20_+2) °C for 20 h. Discharge at a current of 1 IVA at (20 + 2) °C ambient conditions. Until the discharge termination voltage is 2.O V. The capacity of the lithium ion battery should not be lower than 70% of the rated value. The measured battery capacity is 20 Ah. It is the rated value, indicating the capacity value at a low temperature of 20 ° C. no change.
3. Under the condition that the lithium ion battery is fully charged, store it in the high temperature test chamber with environment (55_+2) °C for 5 h, then discharge it at lIVA current at (55±2) °C until the discharge is terminated. The voltage is 2.0 V. Its capacity should not be lower than 95% of the rated value. The actual measured capacity value is 20 Ah, which is the rated value. It shows that the capacity value does not change at a high temperature of 55 °C.
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