Since there is no need to use liquid, the solid-state battery casing and assembly process are simplified, and the soft-packing technology suitable for solid-state battery packaging is expected to open up new growth space for the development of soft-pack batteries.

　　According to the state of electrolyte, soft-pack batteries can be divided into soft-pack liquid batteries and soft-pack polymer batteries. The former uses liquid electrolyte, while the latter currently uses colloidal electrolyte. All-solid-state batteries using solid substances as electrolytes are still in the R&D demonstration stage, which will further improve the energy density and safety of power batteries. Since liquid electrolytes are not used, the battery can be packaged in soft packs. Soft-packed liquid batteries are widely used in domestic mobile phones and power banks. The well-known Nissan Leaf is equipped with laminated soft-packed liquid batteries provided by AESC; soft-packed polymer batteries are used in notebook computers and branded mobile phones.

　　In the long run, all-solid-state batteries have high energy density and strongest safety, and are expected to drive the further development of flexible packaging. All-solid-state batteries replace separators and electrolytes with solid electrolytes such as polymers, oxides or sulfides to fundamentally solve battery safety issues; the energy density of battery cells is expected to increase to 400-500Wh/kg. All-solid-state batteries are still in the research and development stage. BMW, Toyota, Bosch and some domestic companies are actively deploying them, and they are expected to become the mainstream battery route in the future. German Kolibri has developed a large-capacity polymer solid-state lithium battery for Audi. The battery has a total weight of 300kg and a driving range of 600 kilometers. Since there is no need to use liquids, the solid-state battery casing and assembly process are simplified, and the soft-pack encapsulation technology suitable for solid-state battery packaging is expected to open up new growth space for the development of soft-pack batteries.

　　We believe that in the short term, flexible packaging, as a means of battery lightweight and high-energy, will occupy a relatively high proportion of the incremental market. In the long-term, we are optimistic about the trend of soft packaging for all solid-state batteries. The new policy of new energy vehicles has released signals that promote the improvement of battery performance and increase the energy density. As the subsidy threshold continues to increase, flexible packaging can help more battery companies increase energy density and enhance product competitiveness, and flexible packaging will occupy a place in the incremental market.