Cause Analysis and Solution of Seven Common Problems in Lithium Battery Application

BROOKFIELD, Conn. - April 18, 2022 - PRLog -- 一、 The voltage is inconsistent, and the individual is low

1. Large self-discharge causes low voltage

The self-discharge of the battery cell is large, so that its voltage decreases faster than others, and the low voltage can be eliminated by checking the voltage after storage.

2. Uneven charge causes low voltage

When the battery is charged after testing, the battery is charged unevenly due to the inconsistent contact resistance or the charging current of the testing cabinet. The voltage difference is small in short-term storage (12 hours), but the voltage difference is large in long-term storage. This low voltage has no quality problem and can be solved by charging. After charging during production, store it for more than 24 hours to measure the voltage.

二、Internal resistance is too large

1. Detecting equipment differences

If the detection accuracy is not enough or the contact electric group cannot be eliminated, it will cause the display internal resistance to be too large, and the principle of the AC bridge method should be used to test the internal resistance instrument.

2. storage time too long

Lithium batteries are stored for too long, resulting in excessive capacity loss, internal passivation, and increased internal resistance, which can be solved by charging and discharging activation.

3. Abnormal heat causes large internal resistance

The processing of the cell (spot welding, ultrasonic wave, etc.) makes the battery abnormally heated, which causes the thermal closure of the diaphragm, and the internal resistance increases seriously.

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