1. Soft battery
This is a new type of battery structurally packaged in aluminum-plastic film. In the event of a safety risk, the soft battery will only swell. and crack as much as possible. For example: Soft-pack lithium battery is just a liquid lithium-ion battery with a polymer shell.
2. Soft-pack batteries have certain shortcomings:
(1) The existing soft-pack battery cell models are few and cannot meet market demand; (2) The cost of developing new models is high.
Detailed information:
1. Good safety: Soft-pack batteries are structurally packaged in aluminum-plastic film. In the event of loss of thermal management or perforation, soft-pack batteries presentnt the following advantages:
1. The pack will provide buffer space for the battery core, causing bulge and deformation, which will eventually catch fire or smoke, but not explode.
2. Lightweight and high energy density: Soft shell batteries are 40% lighter than steel shell batteries of the same capacity and 20% lighter than aluminum shell batteries. Therefore, they generally have higher energy. However, currently, most domestic battery manufacturers who have exceeded the energy density bar of 300 Wh/kg use soft batteries.
3. Good electrochemical performance and long life: The internal resistance of soft-pack batteries is low, which can significantly reduce the battery's self-consumption in addition to the life of soft-pack batteries; is longer.
Baidu Encyclopedia - S-packaged lithium batteriesouple
Although soft packaging lithium batteries are not popular in China, their share in the international market The rate reaches 70%. Here are the advantages and disadvantages of soft-pack lithium batteries:
1. Advantages
1. Good battery performance Safety: The soft-packaged lithium battery is structurally packaged in an aluminum-plastic film. When there is a safety risk, the soft package lithium battery will usually swell first or crack due to the seal. to release energy. It will not behave like lithium batteries packed in hard packaging. Batteries also pose a risk of explosion.
2. Light weight: The weight of soft batteries is high. 40% lighter than steel-shelled lithium batteries of the same capacity and 20% lighter than aluminum-shelled batteries%;
3.Small internal resistance: The minimum internal resistance. domestic flexible battery cells can be less than 35m?, which significantly reduces battery self-consumption;
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4. Flexible design: the size and shape of the software; Pack batteries can be designed according to actual needs, unlike hard pack batteries which only have round and square options.
2. Disadvantages
1. Imperfect supply chain: purchasing certain raw materials and production equipment for the lithium soft-pack batteries The channel is still relatively single. Once problems arise with suppliers, it will have a certain impact on the production and operation of battery companies and the stability of supply of automobile companies;
2; . High cost: At present, high-g aluminum-plastic filmamme used in soft packaging lithium batteries still depends on imports, and the cost is very high;
3; .Few models: existing soft-pack lithium batteries The models are very limited and the cost of developing new models is too high. At this point, soft-pack lithium batteries can only meet a small portion of market demand.
Will soft lithium batteries explode?
As the above shows, soft lithium batteries will not explode. In extreme cases, this type of battery can crack from the seam to release energy. will not explode like a packed lithium battery to a certain extent. Lithium-ion batteries are at risk of exploding once the energy has accumulated.
In foreign markets, the number of models equipped with soft-pack batteries is still very large. According to incomplete statisticses, more than 30 models are equipped with soft-pack batteries, among which Among the 20 best-selling new energy passenger cars in Europe in 2020, 15 models are equipped with soft-pack lithium batteries, so there are no No need to worry too much about battery safety.