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Square lithium-ion batteries usually refer to aluminum or steel shell square batteries. The popularity of square batteries is high in China, because the structure of square batteries is relatively simple, unlike cylindrical batteries that use high-strength stainless steel as shells and accessories with explosion-proof safety valves. Therefore, the overall weight of accessories is lighter and the relative energy density is higher. There are two different processes for square batteries: winding and stacking.

A typical square lithium-ion battery, important components include: top cover, shell, positive plate, negative plate, lamination or winding of separator, insulation parts, safety components, etc. Among them, the two in the red circle are safety structures, NSD needle safety devices; OSD overcharge protection device.

advantage

High reliability of square lithium-ion battery packaging; High system energy efficiency; Relatively light in weight and high in energy density; The structure is relatively simple and the expansion is relatively convenient, making it an important option to increase energy density by increasing monomer capacity; If the capacity of a single unit is large, the system structure is relatively simple, making it possible to monitor the individual units one by one; Another benefit of a simple system is its relatively good stability.

shortcoming

Disadvantages: Due to the fact that square lithium-ion batteries can be customized according to the size of the product, there are thousands of models available on the market, and due to the large number of models, it is difficult to unify the process; The level of processing automation is not high, and the individual differences are significant. In large-scale applications, there is a problem where the system lifespan is much lower than the individual lifespan.

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