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Adaptability of polymer battery to temperature environment

长兴新能源 2021-07-09 16:22 Company

The safe use of polymer battery in different environmental conditions is very important. Of all the environmental factors. Temperature has the greatest influence on the charge discharge performance of polymer battery. The electrochemical reaction at the electrode / electrolyte interface is related to the ambient temperature. The interface between electrode and electrolyte is regarded as the heart of polymer battery. If the temperature decreases, the reaction rate of the electrode will also decrease: assuming that the voltage of the polymer battery remains constant, the discharge current will decrease. The power output of polymer battery will also decrease. If the temperature rises, the opposite is true. That is to say, the output power of polymer battery will increase. The results show that the temperature also affects the transmission speed of the electrolyte, the increase of temperature will accelerate, and the decrease of temperature will slow down: the charge discharge performance of the polymer battery will also be affected. But the temperature is too high. It will destroy the chemical balance in the polymer battery.
 
After the battery is assembled and filled with liquid, it will be charged and activated once, which is called formation. The specified temperature of formation is 45 ± 5 ℃.
 
After formation, after standing for a period of time, capacity test will be carried out, that is to charge the battery. The specified temperature for capacity test is 35 ± 5 ℃.
 
The storage temperature of the battery is generally 25 ± 5 ℃, and the temperature will affect the activity of lithium ion. The higher the temperature is, the higher the activity is. However, when the temperature exceeds 60 ℃, it may cause irreversible damage to the internal isolation film of the polymer battery, resulting in the scrapping of the battery. If the temperature is too low, the lithium ion activity will be too low, resulting in the battery capacity can not be released, that is, there is no power. In the winter of the north, when the indoor mobile phone with full power reaches the outdoor, it can't make a call, which is the reason. But as long as it returns to normal temperature, it will recover, and the impact on the battery is not great. When the battery is used at 35 ℃, the capacity is relatively high. If the temperature rises again, the impact on the capacity is relatively small. If the temperature exceeds 60 ℃, the battery may be damaged, thus affecting the battery life. If the temperature is too low, the capacity will be low, that is, some power is not discharged. In general, the capacity difference is not too big when the battery is in normal use. Taking LiFePO4 as an example, the capacity at 20 ℃ is only 0.95% lower than that at 45 ℃, less than 1%.
 
In conclusion, the effect of temperature on polymer battery is minimal, and it is also safe.
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