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Soft pack lithium-ion battery

The key materials used in soft pack lithium-ion batteries include positive electrode materials, negative electrode materials, and separators, which are not significantly different from traditional steel and aluminum shell lithium-ion batteries. The biggest difference lies in the soft packaging material (aluminum plastic composite film), which is the most critical and technically challenging material in soft pack lithium-ion batteries. Flexible packaging materials are usually divided into three layers, namely the outer barrier layer (usually an outer protective layer composed of nylon bOPA or PET), the barrier layer (middle layer of aluminum foil), and the inner layer (multi-functional high barrier layer).

The packaging material and structure of the flexible battery make it have a series of advantages. The official account of the electric expert summarizes that, for example, the safety performance is good, and the flexible battery is packaged with aluminum plastic film on the structure. When a safety problem occurs, the flexible battery will generally burst, rather than explode like the steel shell or aluminum shell cell; Lightweight, soft pack batteries are 40% lighter than steel shell lithium-ion batteries of the same capacity and 20% lighter than aluminum shell lithium-ion batteries; Low internal resistance, the internal resistance of soft pack batteries is smaller than that of lithium-ion batteries, which can greatly reduce the battery's self consumption; Good cycling performance, the cycle life of the soft pack battery is longer, and the attenuation after 100 cycles is 4% to 7% less than that of the aluminum shell; Flexible design, variable shape, and can be thinner. New battery cell models can be customized according to customer needs. The shortcomings of soft pack batteries are poor consistency, high cost, and easy leakage. High costs can be addressed through large-scale processing, while leakage can be addressed by improving the quality of the aluminum plastic film.

Comparison and decomposition of technical characteristics

1. Battery shape: Square lithium-ion batteries can be of any size, so they cannot be compared to cylindrical batteries.

2. Multiplication characteristics: Due to the process limitations of welding multipole ears for cylindrical lithium-ion batteries, the multiplication characteristics are slightly inferior to those of the square multipole ear method

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