Date: 2024-03-20 hits: 205
A. The Role of the Lithium-ion Battery Outer Envelope
Lithium battery outer envelope is a special plastic film, its main role is to protect the lithium battery from the influence of the external environment, to prevent the battery performance decline or safety accidents caused by physical impact, temperature changes, humidity changes and other factors.
The outer envelope can maintain the integrity of the electrolyte and electrode inside the battery, avoid the intrusion of water, oxygen and other harmful substances, thus extending the service life of the battery and ensuring the safety performance of the battery.
B. The Material of the Lithium-ion Battery Outer Envelope
At present, the common lithium battery outer coating materials are mainly polyimide film (PI) and polypropylene film (PP).
1. Polyimide film (PI) : This is a high-performance synthetic resin, with high temperature stability, low specific gravity, good heat resistance, heat insulation, oxygen insulation, corrosion resistance and mechanical properties.
The use of polyimide film in the outer envelope of lithium battery can effectively protect the battery from the influence of external environment.
2. Polypropylene film (PP) : It is also a commonly used plastic film material, with good mechanical properties, heat resistance, insulation and chemical stability.
The use of polypropylene film in the outer envelope of lithium battery can effectively prevent the leakage of electrolyte inside the battery and the intrusion of harmful substances such as water and oxygen outside.
C. The Advantages of the Lithium-ion Battery Outer Envelope
1. Heat insulation: Whether it is polyimide film or polypropylene film, it has excellent heat insulation performance.
This can prevent the battery from overheating to a certain extent and reduce the safety risks caused by high temperatures.
2. Oxygen insulation: The outer envelope can effectively block oxygen from entering the battery, thereby preventing the battery from being damaged by oxidation.
3, corrosion resistance: These two materials have high corrosion resistance to various chemicals, including electrolyte, to ensure that the battery will not be corroded during use.
4, high mechanical strength: the outer envelope of the lithium battery has good mechanical strength and toughness, which can effectively prevent the battery from being broken by external forces such as extrusion and puncture during use.
5. Automatic sealing: The use of polyimide film or polypropylene film as the outer coating of lithium batteries can achieve automatic sealing, simplifying the production process, reducing production costs and labor costs.
6 Environment friendly: lithium battery outer coating material is degradable, environmentally friendly, in line with the concept of green environmental protection.
D. The Caution of the Lithium-ion Battery Outer Envelope
In the use of lithium battery outer envelope, if not properly used or handled, may still cause safety problems.
We need to pay attention to the following points :
1. Do not tear or pinch the outer envelope of the lithium battery at will.
Once the outer envelope is damaged, the battery should be stopped immediately to prevent the occurrence of dangerous situations such as electrolyte leakage or short circuit.
2. When storing lithium batteries, avoid direct exposure to sunlight. Direct sunlight may increase the battery temperature, causing a safety hazard. It is recommended to store the battery in a cool and dry place.
3. When charging lithium batteries, be sure to choose the right charger. Overcharging can cause battery damage and even cause safety accidents. Users should choose the appropriate charger according to the rated capacity of the lithium battery, and avoid charging for a long time or using a mismatched charger.
4. When using lithium batteries, avoid placing them in a humid environment. Water is the natural enemy of lithium batteries, and any battery that comes into contact with water can cause dangerous situations such as short circuits or explosions. Therefore, during use and storage, the lithium battery should be kept dry.
5, regularly check whether the outer envelope of the lithium battery is intact. Any broken or aged outer envelope can degrade battery performance or cause safety issues. If the outer envelope is found to be damaged or aging, a new outer envelope should be replaced in time.
6, waste lithium batteries and their outer coatings should be properly disposed of in accordance with relevant regulations. The wrong way of waste may lead to environmental pollution or safety accidents. Therefore, users should comply with relevant laws and regulations and environmental protection requirements when disposing of discarded lithium batteries and their outer envelopes.
E. Summary
In summary, the lithium batteny envelope is an important element to protect the lithium batery, we should fully understand its role, material and advantages, andstrictly comply with precautions during use. Only in this way can we ensure the safety and stable performance of lithium batteries during use, extend their senvice life, and also contribute to the protection ofthe environment and human safety.
