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The Influence of Temperature on the Lithium Cell Testing Equipment Test Battery

2021-07-03

The influence of temperature on the detection of lithium battery testing equipment

1. The internal resistance of the battery will change due to changes in the ambient temperature. For example, when the temperature of the battery decreases, the internal resistance of the battery gradually increases. On the contrary, when the temperature of the battery rises, the internal resistance of the battery gradually decreases. The battery discharge working temperature is in the range of 0℃-30℃. The electrolyte has the best conductivity. At the same time, the hydrogen ion and sulfate ion in the electrolyte diffuse to the active material at a higher speed, which not only improves the effect of concentration polarization , The electrode reaction speed is increased, and the influence of electrochemical polarization is further improved.

2. When using the lithium battery test equipment to test the battery capacity, the viscosity of the sulfuric acid solution will be different at different temperatures. If the temperature continues to decrease, the resistance of the sulfuric acid solution will continue to increase, which will increase the influence of electrode polarization, and the battery capacity will be obvious Decrease.

3. When using the lithium battery test equipment to test the charge and discharge of the battery, we need to repeat the cycle of discharge and low-voltage constant-voltage charging. For example, the temperature of the battery is not high due to the thermal conduction of the battery at the beginning. If the charge and discharge cycle is repeated, the electrolyte The temperature will be very high. However, when charging at low temperature, the diffusion current density is significantly reduced, while the exchange current density is not reduced much, so the concentration polarization is intensified, which causes a decrease in charging efficiency. On the other hand, the saturation of the lead sulfate discharged last time at low temperature increases the resistance of the battery charge and discharge reaction, thus further reducing the charging efficiency.

4. When Lithium cell testing equipment to test the battery, if the temperature is too high, it will destroy the chemical balance in the battery and cause side reactions. The performance of rechargeable battery materials at high temperatures will degrade and the battery cycle life will be greatly shortened.

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