According to the case of the battery, the lithium-ion batteries on the market are mainly divided into:cylindric lithium-ion battery, pouch cell,aluminum shell battery and coin cell.
The first three are mainstream finished batteries on the market,and the coin cell case is mainly used for materials research.The coin cell case is mainly made by stainless steel 304 and stainless steel 316.(Abbreviated as SS304 and SS316),SS316 contains more alloying elements than SS304, so the corrosion resistance of SS316 is better than SS304.So SS316 coin cell case will be a little more expensive than SS304.
According the model of the coin cell case,it can divided to:CR2016, CR2025, CR2032, CR1620, CR1632, CR2325 etc.CR20XX are more common in the market, especially CR2032, so this type of battery case has some other processing,like aluminized coin cell case, gold-coated coin cell case and air mesh coin cell case etc.
After introduce about the coin cell case,let's start talking about cylindric lithium-ion battery case,which is the is the earliest commercialization, the highest degree of production automation, and the lowest cost current power battery,and Tesla also choose the 18650 cylinder cell.The cylinder battery case is similar to coin cell case,also is made by SS316 or SS304.Most cylindrical cell steel can manufacturers use steel as the battery shell material, because the physical stability of the steel material is much higher than the aluminum shell material, and after the optimization of the design structure of each manufacturer, the safety device has been placed inside the battery core. The safety of the cylinder stainless steel battery has reached a new height.
The cylinder battery case model have 14500, 18650, 21700, 26650 etc. First two number represent the diameter about the battery,and the next two number represent the height of the battery case.And 0 means the battery case is a cylinder.Like 18650 battery case means diameter is 18mm height is 65mm cylinder battery case.
Although stainless steel case have so many advantage,but stainless steel case has low weight-to-energy ratio and poor safety.So have many factory choose the battery aluminum case.And now these case always is big.And due to the higher cost of battery aluminum case mold opening, there are fewer models and higher order quantity requirements.
Aluminum laminated film can be said that it is an upgraded version of the aluminum shell,lighter quality, lower mold opening cost and higher safety than aluminum case,which is another popular battery case except cylinder battery case.But the aluminum laminated film is weak against pressure and bulging easily.
All model of the battery case we have provide,if you have any need of it,fill free to contact us.
We are TOB NEW ENERGY, we are not only provide the equipment of the battery,but also provide the knowledge of battery.
Contacts: Miss carol(Sales&Engineer)
E-mail:tob.mae@tobmachine.com
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