The effect of temperature on electric vehicle batteries

Many people have encountered the problem that the battery is particularly not durable when used in a cold winter environment. Originally a fully charged battery can be used for a long time, why can it only be used for more than a dozen hours in winter? Let's talk about the effect of temperature on the battery.　　 1. Under high temperature conditions, 　　 the battery runs in the high temperature season, and there is mainly an overcharge problem. When the battery temperature increases, the activity of each active material increases. As soon as the positive electrode oxygen evolution potential decreases, the negative electrode oxygen evolution potential also decreases (the negative value decreases). Therefore, the charging reaction speed during charging is fast, the charging current is large, and the charging is required during charging. The voltage is low. In order to prevent excessively high charging voltage, the battery temperature should be reduced as much as possible, so that the influence of temperature on the battery will be reduced. Ensure good heat dissipation, prevent charging immediately after exposure to the sun, and keep away from heat sources. 2. Under low temperature conditions, the activity of each active material of the battery is reduced under low temperature conditions, and it becomes difficult to dissolve P on its electrodes. It is difficult to replenish P after consuming P during charging. The charging current is greatly reduced. The charge acceptance current at ℃ is only 70% of the normal temperature, while the negative electrode charge is affected by the expansion agent, and the low temperature charge acceptance is lower. The charge acceptance current at -20°C is only 40% of the normal temperature. Therefore, charging under low temperature conditions mainly has the problems of poor charging acceptance and insufficient charging, and it is required to increase the charging voltage and extend the charging time. The improvement of low temperature performance should mainly start from the negative electrode. Thermal insulation and anti-freezing measures should be taken when using at low temperatures, especially when charging should be placed in a warm environment, which helps to ensure sufficient electricity, prevent the generation of irreversible sulfuric acid, and prolong the service life of the battery. Temperature has the greatest impact on the battery in low temperature conditions.　　 Therefore, I remind everyone that temperature has a great influence on the battery. Whether it is in the cold winter or the sultry summer, the battery must be well protected. Previous: Can electric vehicle batteries be repaired?