The polymer battery finally uses a flexible packaging material to form the battery. Strictly speaking, it cannot be called “packaging†because in the field of polymer lithium-ion batteries, the “soft packaging material†forms a battery core together with the contents, and the battery core is assembled to form a battery. Therefore, the “soft packaging material†can be Think of it as an integral part of the battery. However, the material it uses is the common packaging material for people, and it really does play a role in protecting the contents. Therefore, people are still used to calling it "packaging."
Just because the flexible packaging material can be seen as an integral part of the battery, it has an important influence on the performance of the battery. When the content of water and oxygen in the battery reaches a certain level, the capacity of the polymer lithium-ion battery will become smaller, the voltage drop will increase, the battery will not be charged, the battery will not be discharged, and the cycle life will decline. This may eventually lead to the failure of the battery. .
The flexible packaging material achieves the maintenance of the battery performance by blocking water and oxygen. Therefore, the barrier property of the flexible packaging material has an important influence on the battery. In addition, some of the organic substances in the flexible packaging material may dissolve in the electrolyte to cause electrochemical reactions and destroy the performance of the battery; if the electrolyte is swollen by the flexible packaging material, the mixing ratio of the electrolyte will be changed, which is unfavorable for the battery performance.
General Requirements for Polymeric Ion Batteries for Flexible Packaging Materials The flexible packaging material used for polymer lithium-ion batteries is an aluminum-plastic composite film. The general requirements are as follows:
1 has excellent heat sealing polymer lithium-ion battery is very sensitive to high temperatures, the general use temperature is lower than 60 °C, requiring flexible packaging materials in the heat sealing strength is sufficient, the lower the heat sealing temperature, the better. In general, the heat sealing temperature should not exceed 150°C. When a higher heat sealing temperature is used, appropriate edge cooling measures must be used to prevent conduction and radiation during heat sealing from damaging the battery.
2 The heat sealable material does not react with the plating solution The inner layer material of the flexible packaging material can neither be dissolved by the electrolyte nor swell with the electrolyte. If the flexible packaging material is dissolved by the electrolyte, since the working voltage of the battery is as high as 3.6V or more, the dissolved components will undergo electrochemical reaction to generate gas; if the flexible packaging material swells the electrical liberation, the concentration of the electrolyte will be changed and the battery will be affected. Performance.
3 Water-blocking and oxygen-barrier performance with high weight Water vapor permeability coefficient required to reach 10-4～10-6g/m2·d·1atm
Oxygen permeability coefficient required to reach 10-1~10-3cm3/m2·d·1atm
4 The production and assembly of polymer lithium-ion batteries with high flexibility and mechanical strength puts higher requirements on the flexibility of flexible packaging materials; and the safety guarantees during use of the mechanical strength and heat seal strength of flexible packaging materials Made high demands.
5 Has good anti-electrolyte ability to infiltrate the foam After the flexible packaging material is packed in the battery core, the electrolyte cannot leak during long-term storage and turnover.
Just because the flexible packaging material can be seen as an integral part of the battery, it has an important influence on the performance of the battery. When the content of water and oxygen in the battery reaches a certain level, the capacity of the polymer lithium-ion battery will become smaller, the voltage drop will increase, the battery will not be charged, the battery will not be discharged, and the cycle life will decline. This may eventually lead to the failure of the battery. .
The flexible packaging material achieves the maintenance of the battery performance by blocking water and oxygen. Therefore, the barrier property of the flexible packaging material has an important influence on the battery. In addition, some of the organic substances in the flexible packaging material may dissolve in the electrolyte to cause electrochemical reactions and destroy the performance of the battery; if the electrolyte is swollen by the flexible packaging material, the mixing ratio of the electrolyte will be changed, which is unfavorable for the battery performance.
General Requirements for Polymeric Ion Batteries for Flexible Packaging Materials The flexible packaging material used for polymer lithium-ion batteries is an aluminum-plastic composite film. The general requirements are as follows:
1 has excellent heat sealing polymer lithium-ion battery is very sensitive to high temperatures, the general use temperature is lower than 60 °C, requiring flexible packaging materials in the heat sealing strength is sufficient, the lower the heat sealing temperature, the better. In general, the heat sealing temperature should not exceed 150°C. When a higher heat sealing temperature is used, appropriate edge cooling measures must be used to prevent conduction and radiation during heat sealing from damaging the battery.
2 The heat sealable material does not react with the plating solution The inner layer material of the flexible packaging material can neither be dissolved by the electrolyte nor swell with the electrolyte. If the flexible packaging material is dissolved by the electrolyte, since the working voltage of the battery is as high as 3.6V or more, the dissolved components will undergo electrochemical reaction to generate gas; if the flexible packaging material swells the electrical liberation, the concentration of the electrolyte will be changed and the battery will be affected. Performance.
3 Water-blocking and oxygen-barrier performance with high weight Water vapor permeability coefficient required to reach 10-4～10-6g/m2·d·1atm
Oxygen permeability coefficient required to reach 10-1~10-3cm3/m2·d·1atm
4 The production and assembly of polymer lithium-ion batteries with high flexibility and mechanical strength puts higher requirements on the flexibility of flexible packaging materials; and the safety guarantees during use of the mechanical strength and heat seal strength of flexible packaging materials Made high demands.
5 Has good anti-electrolyte ability to infiltrate the foam After the flexible packaging material is packed in the battery core, the electrolyte cannot leak during long-term storage and turnover.
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