What are the main shortcomings of soft-pack lithium batteries compared to square and cylindrical lithium batteries?

On January 20, 2018, the 2018 Forum of China Electric Vehicles 100 People's Association, the head of the overall expert group of the National 863 Program Energy Conservation and New Energy Vehicles Major Project Ouyang Minggao introduced the research progress of power battery. Among them, CATL, lishen, Guoxuan High-Tech, which are responsible for the new lithium-ion power battery project, have chosen the ternary soft-package technology route, and the energy density has reached 300Wh/kg.

However, this can only indicate that the three companies that undertake the national specialization recognize the high energy density characteristics of the ternary soft-package technology route. The actual expansion is still the enterprise's starting point for itself and seeking a balance between technology and efficiency.

Soft pack batteries currently have two main shortcomings that have an overwhelming advantage for square and cylindrical batteries:

First, the cost problem: the core component of aluminum plastic film is currently less localized, mainly relying on foreign imports, and the cost is high.

The second is the process difficulty: the soft-packed battery core usually adopts the lamination process instead of the winding method. In the process of lamination die-cutting, the traditional metal die-cutting machine often causes burrs on the punched cut surface and easy to drop powder, resulting in the quality of the pole piece. Not good, seriously affecting the safety performance of the finished battery, while the residual dust in the complex use environment, it is easy to cause internal short circuit of the battery, lightly shorten the battery life, and then cause the battery to have safety problems.

The page contains the contents of the machine translation.