Troubleshooting for lithium battery:

1. Why does the battery have zero voltage (low voltage)? And how?

1) Whether the battery is subject to external short circuit, over discharge or reverse charging (the positive and negative poles of the battery or charger are reversed, which is equivalent to forced over discharge during battery charging); Whether the circuit is normal; Check whether the battery of the spot welding product is burned again.
2) Whether the battery is continuously overcharged by high rate and large current, resulting in the movement and expansion of the battery and the direct contact and short circuit of the internal positive and negative electrodes.

3) Whether the battery is in good condition.

method:
1) Understand the specific purpose of the customer's battery;
2) Charge the battery of the same type, connect it to the electrical appliance, and judge whether the electrical appliance is normal;

3) Charge the battery with 1C current for 30 minutes and open circuit for about 10 minutes. If the open circuit voltage of the battery is stable within the normal voltage range of the battery, the battery can basically return to normal. If the battery is damaged, the voltage cannot be recovered; If this phenomenon occurs after the battery is not used, 1c charging cannot recover the voltage, which needs further analysis by professional technicians.

4) It is recommended that the customer pay attention to the distance between the spot welding current and the welding needle, and try to reduce the number of back and forth folding.

2. How is the zero voltage (low voltage) of the battery pack or battery with circuit board caused? How?
1) Check whether the battery has zero (low) voltage;
2) Check whether the connection of battery pack, electronic components and protection circuit is abnormal.

3) Check whether the charging equipment or charging circuit has charging voltage / current output under charging state;

4) Whether the ambient temperature is too high and whether the charging efficiency is low;

method:
1) Understand customers' specific use and conditions of battery;
2) Single cell step-by-step analysis process;
3) According to the amount of charging current, the battery and multimeter of the same type are connected in series to the circuit for charging.
This value determines whether the charging device is normal.
4) It is recommended that customers choose charging equipment or charging circuit to have better stability and performance;
5) Find out if the customer is a self-assembled battery pack. If not, or have this before use
This phenomenon needs further analysis by professionals and technicians.