Analysis of the structure, composition, and performance advantages of Power battery cells
Apr 10, 2026
Overview and Classification of Power battery cells
Lithium solar batteries can be divided into square lithium batteries, cylindrical lithium batteries, and button type lithium batteries according to their appearance; According to the shell material, it can be divided into aluminum shell lithium batteries, steel shell lithium batteries, and soft pack batteries; According to the positive electrode material, it is divided into types such as lithium cobalt oxide, lithium iron phosphate, lithium manganese oxide, and lithium polymer.
At present, the mainstream packaging forms of Lithium-ion batteries mainly include cylindrical, square, and soft pack. Among them, square lithium batteries usually refer to aluminum or steel shell square batteries, which have a high penetration rate in the domestic market. The structure of square batteries is relatively simple, unlike cylindrical batteries that use high-strength stainless steel shells and explosion-proof safety valves and other accessories. Therefore, the overall weight of the accessories is relatively light and the energy density is relatively high.
Structure composition of Power battery cell
A typical Lithium superpack batteries mainly consists of: top cover, shell, laminated or wound structure composed of positive electrode plate, negative electrode plate, and separator, insulation components, and safety components. Among them, needle safety protection device (NSD) and overcharge protection device (OSD) are important safety structures. The needle punching safety protection device is a metal layer (such as copper foil) added to the outermost layer of the core. When needle punching occurs, the local high current generated at the needle punching position can be quickly dispersed through the large-area metal foil, reducing the unit area current and preventing local overheating, thus slowing down the occurrence of thermal runaway.
The overcharge protection device is usually a metal foil used in conjunction with a fuse, which can be designed on the positive current collector. When overcharged, the pressure generated inside the Solar energy storage systems lithium batteries pack triggers the OSD device to cause an internal short circuit, generating an instantaneous high current that causes the fuse to melt, thereby cutting off the internal current circuit of the battery. The shell is generally made of steel or aluminum, and with the market's pursuit of energy density and advances in production technology, aluminum shells have gradually become mainstream.
Main advantages
Lithium battery pack has multiple performance advantages. Firstly, its packaging reliability is high and the system energy efficiency is high. Secondly, due to its relatively simple structure and lightweight accessories, square batteries have a higher energy density. Furthermore, the expansion of square batteries is relatively convenient and is currently an important technological path to improve energy density by increasing the capacity of individual cells. The large capacity of each unit simplifies the system composition, making it easier to monitor each unit one by one. Another advantage brought by system simplification is better overall stability.
summary
In summary, Lithium-ion battery pack has become one of the mainstream packaging forms in the current lithium battery market due to its advantages of simple structure, high energy density, reliable packaging, and good system stability. The safety design of its needle punching safety protection device and overcharge protection device further enhances the reliability of the battery during use. With the continuous maturity of aluminum shell technology and the market's continued pursuit of high energy density, Battery pack kits will continue to play an important role in the future of power batteries and energy storage.
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