First-ever BOPA Membrane Material Specifically For Solid-state Batteries

First-ever BOPA Membrane Material Specifically For Solid-state Batteries

With the development of battery technology, solid-state batteries, due to their high energy density, high safety, and long cycle life, are considered an important development direction for next-generation power battery technology. Unlike traditional liquid batteries, solid-state batteries are expected to adopt a pouch packaging form. Among them, the pouch packaging solution equipped with a BOPA membrane material specifically for solid-state batteries has more significant technical adaptability:

(1) Compared with the winding process used in cylindrical or square batteries, inorganic solid electrolyte membranes have poor flexibility and cannot be wound, so only a pouch stacking process can be used;

(2) The high ductility of the aluminum-plastic film can better adapt to the overall expansion and contraction formed by lithium ions during migration;

(3) Both solid-state batteries and pouch battery solutions have high energy density characteristics, and matching the two can further enhance the advantages of battery life and usage time. Therefore, in terms of battery packaging materials and processes, the use of aluminum-plastic film soft-pack packaging technology is considered a highly suitable and promising technical route. It not only effectively meets the demands of solid-state batteries for high energy density, lightweight design, flexibility to adapt to volume changes, and shape flexibility, but also reduces the risk of battery rupture under pressure or deformation, thus improving safety.

Xiamen Changsu pioneered a dedicated BOPA film material for solid-state batteries in the industry. In September 2025, in collaboration with aluminum-plastic film companies, power battery companies, and vehicle manufacturers, the company drafted, released, and implemented an industry standard for aluminum-plastic composite films for solid-state batteries. The company's dedicated BOPA film material for solid-state batteries is currently the battery packaging solution suitable for the soft-pack solid-state battery technology path. In the future, as the industrialization of solid-state batteries accelerates, the company will closely monitor its market penetration rate and simultaneously promote the step-by-step, large-scale growth of the production and sales volume of dedicated solid-state battery film materials.