In fact, there are two situations in which electric vehicle batteries heat up, one is discharge heat, and the other is charging heat.
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1. Discharge heat
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The main reasons for discharge heating are: discharge too fast, it may be that the battery capacity is small, and the discharge current exceeds 0.5C for a long time.
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1) When the rated voltage of the motor is low, the battery capacity is small, and the working current is large, the voltage will be sharply reduced, and the capacity will be quickly consumed, which is most unfavorable to the battery.
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2) The electrochemical reaction speed of the battery can only maintain the driving, often do the whole cycle charge and discharge, a little attention will be consumed. When facing the wind uphill, the power consumption is very large, forcing the battery plate to react sharply, the heat of the battery shell is high, which will cause the battery to be damaged and shorten the life.
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3) It is more ideal that the electrochemical reaction speed of the battery is sufficient to supply enough electrical energy. The case of the battery has no abnormal heat, indicating that the battery capacity is sufficient.
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2. Charging heat
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Heat during charging, possible causes of failure are:
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1) The battery itself is a problem, the aging of the battery, the internal resistance increases, the electrolyte dries up, and the internal short circuit causes heat.
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The battery increases with the number of times it is used, including discharge and charging, and the water molecules in the battery are gradually lost, which is what we call the battery gas out and water loss, resulting in the battery heating in the electrochemical reaction.
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In addition, sulfuric acid crystallization is formed in the battery solution during the charging and discharging process, which precipitates and sticks on the lead plate, resulting in increased battery resistance and heating.
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These two kinds of problems can be solved by technical means such as adding water and desulfur. If the battery is due to sprint break caused by the battery heat, it is best to replace the new battery.
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2) Charger problem, this is the most common.
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Most families will have one or more electric vehicles, and many families of electric vehicles are different brands, battery chargers are naturally different. In the process of use, often mixed with the use, so the mismatched charger will cause the battery to move the heat of the power supply when charging, so there is a hot hot situation, in this regard, it is recommended not to easily use other brands of chargers, only their own.
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If your charger is broken, then it is recommended to buy and configure the original purchase point, which can prevent you from buying the right one.
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Of course, if you can buy a customized battery charger, it is more consistent with the characteristics of the battery you use, whether it is in the number of charges and discharges, or safety and stability, it is more compatible with the battery you use!
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In order to fundamentally solve the battery heat caused by the charger problem, it is necessary to correctly choose the electric vehicle charger, the battery charging process is an electrochemical reaction process, in this process, if the battery appears trace fever is normal fever, if the fever is abnormal, it is necessary to check whether the charger matches, if the charger has no problem, it is necessary to consider the battery itself.