There are two main reasons for the failure of electric vehicle ion batteries: the crystallization of lead sulfate on the negative plate and the softening of active substances on the positive plate. The crystallization salinization of lead sulfate on the negative plate is mostly caused by water loss, undercharging and other reasons, which causes the formation of coarse particles of crystallized lead sulfate on the surface of the negative plate, resulting in a rapid decline in charging acceptance and a slow electrochemical reaction. The softening of the active material of the positive plate is the main reason for the decline of battery capacity.
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There are several ways to repair this type of battery:
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1. High current repair: by increasing the charging current to 0.3C~0.5C, and then using a small current to supplement the charging; Fully charged batteries are best stored at 40 ° C ~ 60 ° C; Discharge to 0V with a small current of less than 0.05C. This is repeated several times, and the battery capacity can be restored.
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2. Small current pulse repair: Through the use of special overcharge, pulse current method, more than 90% of the salinized battery can be activated. This method is basically non-destructive repair, but the repair time is too long.
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3. \"Spa\" method: For sulphated batteries, they can be repaired by replenishing tools, but be careful not to use metal-containing appliances.
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It should be noted that the above method is not applicable to all types of batteries, such as the repair method of lean lead-acid batteries and rich liquid batteries is different. Therefore, before deciding which method to take, it is recommended to determine the type of battery and the specific cause of failure.