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This layer is an aluminum-plastic film that wraps the flexible battery, similar to the battery case, to reduce and avoid the risk of explosion if your battery is short-circuited. If the aluminum-plastic film is damaged, its covering properties will not be very good. In the event of a short circuit, it may explode directly instead of inflating into a small package.
Common shapes in the explosion-proof membrane market are: round, oval, etc. The material is pure aluminum or aluminum alloy; the thickness is 0.01-0.05mm; the explosion-proof disc is fixed to the exhaust opening by welding: the exhaust hole is formed on the side wall: there is a placement groove around the exhaust opening. , and the explosion-proof disk is fixed inside the tank. When the internal battery pressure increases and exceeds the pressureWhen the explosion-proof valve is opened, the explosion-proof valve breaks from the notch and opens to release the pressure, thereby playing an explosion-proof role.
All lithium-ion batteries, whether in the past or recent years, including: polymer lithium-ion batteries, lithium iron phosphate batteries, etc., are very afraid short circuits inside the battery. and external damage to the battery. Short circuit and overload.
Since the chemical properties of lithium are very active and easy to burn, when the battery is discharged and charged, the temperature inside the battery continues to rise. The gas generated during the activation process expands and. the internal pressure of the battery will increase. The pressure reaches To a certain extent, if the outer shell is damaged, it will break, causing leakage, fire or even explosion.
In order to mitigate the dangers of batlithium-ion series, technicians have added ingredients that can inhibit the activity of lithium elements (such as cobalt, manganese, iron, etc.), but these do not fundamentally change the dangers of lithium-ion batteries. ion.
When ordinary lithium-ion batteries are overcharged, short-circuited, etc., the temperature inside the battery may rise, the positive electrode material decomposes, the materials of the battery The negative electrode and electrolyte are oxidized, etc., which in turn leads to gas expansion and internal pressure of the battery. When the pressure reaches a certain level, an explosion can occur. Since lithium-ion polymer batteries use colloidal electrolytes, they will not produce a large amount of gas due to liquid boiling, eliminating the possibility of violent explosions.
At present, most polymer batteries domestics are only soft batteries, using aluminum-plastic film as the casing, but the electrolyte has not changed. This type of battery can also be diluted, and its low temperature discharge characteristics are better than polymer batteries. The energy density of the material is basically the same as that of liquid lithium batteries and ordinary polymer batteries. However, due to the use of aluminum-plastic film. , it is more durable than ordinary liquid lithium batteries. In terms of safety, when the liquid boils, the aluminum-plastic film of the soft battery will naturally swell or rupture, and it will not explode.
It should be noted that new batteries can still burn, expand and crack, so safety is not foolproof.
So everyone should pay attention to safety when using various lithium-ion batteries.