What are the possible reasons for zero or low voltage in polymer lithium batteries?

What causes zero or low voltage in polymer lithium batteries? Possible reasons include the following: high-capacity lithium batteries:

1. External short circuit of polymer lithium batteries, such as a pile of batteries falling to the ground, overlapping and short circuiting of the terminal ears, and the positive and negative terminal ears being clamped on the same side when the batteries are placed in the cabinet.

2. Internal short circuits or micro short circuits in polymer lithium batteries, such as burrs penetrating the positive and negative electrodes and contacting the separator paper for short circuits, or the separator paper not wrapping the electrode or just being level with the electrode causing short circuits, etc

3. Polymer lithium battery pole ear breakage

4. The ear glue does not expose the packaging film, and the ear is connected to the short-circuit high-capacity lithium battery through the aluminum foil in the middle layer of the packaging.

5. Polymer lithium batteries have not been fully charged

The above five points are possible reasons for zero or low voltage in polymer lithium batteries. When this situation occurs, everyone can conduct a thorough investigation to see where the problem lies!