The charger and the rechargeable battery should be matched, and too much charging voltage will cause too much current, and the battery will be damaged or even explode.
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2, the general lithium battery is equipped with a protection board (that is, a stable pressure board), to prevent the battery from overcharging, chip control, and the battery voltage will stop charging when it reaches a certain limit. Add: There are also many kinds of charging circuits, because the one used by the charger and the value of the battery are not provided. So it's hard to judge. The charging circuit has the output voltage and current will have the limit value and the protection board, and the regular charger will mark 4.2V. That means the charger output voltage to the battery will not exceed 4.2V. Check the rated voltage on the charger and battery, for example, the battery is 3.7V, if the charger is written to output 12V or more, it is obviously not matched. This is also why there is a rectangular box in the middle of the notebook power supply, that is the transformer, the plug of 220V civil electricity, through the transformer into about 19V laptop battery acceptable voltage range. It is best to use the original charger to charge the battery or phone
Yes, excessive charging voltage can cause the lithium battery protection board to burn out. Because lithium batteries have a maximum charging voltage limit, if this limit is exceeded, lithium batteries will overheat, and even have the risk of explosion or fire. The role of the protection board is to protect the lithium battery, and cut off the circuit in time when the voltage is too high or too low to avoid damage to the lithium battery.
If excessive charging voltage continues to be applied to the lithium battery, it will cause the protection function of the protection board to fail, and eventually lead to the protection board burning out.
Therefore, when using lithium batteries, we should follow the relevant charging specifications, use a suitable charger to charge, and avoid excessive voltage damage to lithium batteries and protection boards.
The charging voltage is too high, the lithium battery protection board will burn out, the lithium battery should be charged with the rated voltage, if the voltage is too high, it will cause the battery to heat, and then the protection board will burn out
Protection plate normal
1, the lithium battery through the protection board voltage becomes low, which is caused by the abnormal protection board.
2, lithium battery most of the time, the voltage drop after the protection board is negligible, after the completion of the lithium battery pack assembly, debugging with a multimeter DC voltage file test board before the voltage and over the board voltage are the same.
3, in use due to the failure of the protection board itself, will lead to lithium battery over the board voltage will be reduced a lot.