Interlocking type all-solid-state lithium ion battery membrane blank and forming method and forming device thereof

Abstract

The invention discloses an interlocking type all-solid-state lithium ion battery membrane blank and a forming method and a forming device thereof. The lithium ion battery membrane blank is of an integrated multilayer structure with an integral interlocking structure and comprises a positive pole piece and a polymer solid electrolyte membrane which are connected with each other, and the integral interlocking structure is of a groove-shaped or convex embedded structure formed by superposing multilayer structures. The forming method of the interlocking structure comprises the following steps: co-extruding and forming the polymer solid electrolyte membrane, a cathode active layer and an anode active layer in a co-extrusion manner, and then carrying out tape-casting and hot-pressing forming onthe polymer solid electrolyte membrane, the cathode active layer and the anode active layer with a positive current collector and a negative current collector by adopting an imprinting machine, so asto form the groove-shaped or convex integral interlocking structure while compounding. The device comprises a plurality of extruders, a multi-layer co-extrusion die head, positive and negative currentcollector sleeves and the imprinting machine, the plurality of extruders are jointly connected with the multi-layer co-extrusion die head, and a plurality of grooves are distributed in the surface ofa vacuum forming roller in the imprinting machine. According to the invention, the production period of the lithium ion battery can be effectively shortened, and the structural stability of the lithium ion battery can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of new energy lithium-ion batteries, in particular to an interlocking all-solid-state lithium-ion battery membrane blank, a forming method and a forming device thereof. Background technique [0002] In recent years, lithium-ion batteries with high energy density, high output voltage, and long cycle life with low capacity fade have achieved great success as the main power source for electric vehicles and modern energy storage systems. However, lithium-ion batteries containing organic liquid electrolytes are prone to dangerous phenomena such as chemical side reactions, lithium dendrites, leakage, and internal short circuits. All-solid-state lithium-ion batteries containing solid-state polymer electrolytes are considered to be a very promising alternative due to their high safety. [0003] All-solid-state lithium-ion batteries are mainly composed of positive and negative electrodes and solid polymer electrolyt...

AI Technical Summary

Problems solved by technology

[0007] In the production process of the above-mentioned lithium-ion battery, the battery is prepared by solution casting method, the production cycle of the battery is long, and the solid electrolyte film and the positive and negative pole pieces are in a two-dimensional solid-solid contact mode, even if the formula of the adhesive is changed and the adhesive is improved. However, the interface contact area and interface contact effect between the polymer solid electrolyte membrane and the positive and negative electrode sheets are still not ideal, which in turn affects the preparation of flexible batteries and the overall performance of the entire battery.

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