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Polymer lithium-ion battery is a kind of lithium-ion battery with gel shaped electrolyte and soft package. It is often called soft package lithium-ion battery in the civil market, which makes the lithium-ion battery cell different from the ordinary liquid lithium-ion battery. Therefore, there are some special notes. The following notes are put forward for the possible incorrect practices in the use and assembly of the battery cell.

1、 In terms of battery cell usage, measures include protecting the aluminum-plastic composite film, top sealing edge (pole end sealing edge), side sealing edge, pole handle, and preventing mechanical impact and short circuit.

1. Aluminum plastic composite film outer packaging protection: It is important to prevent damage caused by sharp parts piercing. For this reason, the surrounding environment of the battery should be regularly cleaned, and sharp parts should not come into contact or collide with the battery cell. When using it, gloves can be worn to prevent fingernails from scratching the surface of the battery cell.

2. Top and side edge protection: To prevent damage to the top and side edges and damage to the sealing effect, bending the top and side edges should be prohibited; At the same time, reliable insulation isolation measures must be taken in the design of the battery cell to prevent short circuits between the negative electrode and the aluminum-plastic composite film.

3. Pole handle protection: The positive terminal of polymer lithium-ion battery cells adopts an aluminum pole handle, and the negative terminal adopts a nickel pole handle. Due to the thin handle, bending should be prohibited; At the same time, it is necessary to prevent contact between the pole handle and the aluminum-plastic composite film during the production process, and strictly isolate it with a ring film.

4. Prevent mechanical impacts such as falling, striking, bending battery cells, and accidentally stepping on batteries.

5. It is prohibited to short-circuit the positive and negative poles with metal objects or wires.

2、 After completing a battery cell, the next step is to correctly combine it with the casing and cell protection circuit module to make it a polymer battery. The precautions during this process include:

1. Shell design: (1) Sufficient mechanical strength to prevent external mechanical damage to the battery cell, (2) When installing the battery cell inside the shell, prevent sharp edges and corners of the shell from scratching the battery cell; (3) To prevent short circuits caused by pure aluminum in the aluminum plastic composite film interlayer and external contact.

2. A battery cell protection circuit must be designed, including scientific settings for the highest/lowest voltage, overcurrent protection, and overcharging and discharging protection for battery cells (single cells) when used in combination.

3. The transfer of the positive aluminum pole handle through nickel strips and the connection between the battery cell and the circuit board should be carried out using ultrasonic welding or spot welding technology.

4. The reliable positioning of the battery cells, after assembly, should be securely fastened inside the shell without movement, so that the entire lithium-ion battery structure is in a consolidated state.

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