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CN-224217665-U - Diaphragm, electrode assembly, battery and electric equipment

CN224217665UCN 224217665 UCN224217665 UCN 224217665UCN-224217665-U

Abstract

The embodiment of the application provides a diaphragm, an electrode assembly, a battery and electric equipment. The diaphragm comprises a structural layer, wherein the structural layer comprises a base film and a solid electrolyte layer, and the solid electrolyte layer is arranged on at least one side of the base film. The bonding layer is provided with two and sets up in the both sides of structural layer respectively, and the bonding layer includes a plurality of cold pressing glue groups, and the glue group of colding pressing is lattice form and distributes. The solid electrolyte layer and the cold-pressed glue clusters distributed in a lattice form eliminate the impedance influence of the cold-pressed glue on the diaphragm, so that the direct-current internal resistance of the battery adopting the diaphragm is reduced, and the production and processing cost of the battery adopting the diaphragm is reduced.

Inventors

  • CHEN YANG
  • LIU ZHIMIN
  • LI YANG

Assignees

  • 北京车和家汽车科技有限公司

Dates

Publication Date
20260508
Application Date
20250327

Claims (12)

  1. 1. A separator, comprising: -a structural layer (11), the structural layer (11) comprising a base film (111) and a solid electrolyte layer (112), the solid electrolyte layer (112) being arranged on at least one side of the base film (111); The bonding layer (12), bonding layer (12) are provided with two and set up respectively in the both sides of structural layer (11), bonding layer (12) include a plurality of cold pressing glue groups (121), cold pressing glue groups (121) are lattice form and distribute.
  2. 2. The membrane according to claim 1, characterized in that the coating radius of the cold-pressed micelles (121) is a,0cm < a < 0.5cm.
  3. 3. The membrane according to claim 1, characterized in that the spacing between two adjacent cold pressed micelles (121) is b,0cm < b≤1 cm.
  4. 4. The membrane according to claim 1, characterized in that the thickness of the adhesive layer (12) is c,0.5 μm c 10 μm.
  5. 5. The separator according to claim 1, wherein the solid electrolyte layer (112) has a thickness d of 0.5 μm and d 10 μm.
  6. 6. The separator according to claim 1, wherein the solid electrolyte particles of the solid electrolyte layer (112) have a particle diameter e of 0.1 μm≤e≤3 μm.
  7. 7. The membrane according to any one of claims 1-6, characterized in that the structural layer (11) further comprises a ceramic layer (113), the ceramic layer (113) being arranged on the side of the base film (111) facing away from the solid electrolyte layer (112).
  8. 8. The membrane of claim 7, wherein the ceramic layer (113) has a thickness f,0.5 μm and f and 10 μm.
  9. 9. The membrane according to claim 7, characterized in that the ceramic particles of the ceramic layer (113) have a particle size g,0.1 μm≤g≤3 μm.
  10. 10. An electrode assembly is characterized by comprising a positive plate (2), a negative plate (3) and the diaphragm (1) according to any one of claims 1-9, wherein the positive plate (2) and the negative plate (3) are respectively arranged on two sides of the diaphragm (1).
  11. 11. A battery comprising the electrode assembly of claim 10.
  12. 12. A powered device comprising the battery of claim 11.

Description

Diaphragm, electrode assembly, battery and electric equipment Technical Field The application belongs to the technical field of batteries, and particularly relates to a diaphragm, an electrode assembly, a battery and electric equipment. Background Composite separator is a commonly used battery separator structure. The existing composite diaphragm is generally provided with an adhesive layer, wherein the adhesive layer is hot-pressed adhesive with viscosity at 100 ℃, and is adhered with the positive plate and the negative plate through a hot-pressing process. The hot-pressing glue in the composite diaphragm is replaced by cold-pressing glue with viscosity at room temperature, and the hot-pressing process in the processing process can be changed into the cold-pressing process. Thus, the production cost of the battery is reduced, and the safety performance of the battery is improved to a certain extent. However, the cold-pressed glue is an inactive area in the battery, which easily causes a significant increase in DCR (Direct Current Resistance, direct current internal resistance) of the battery, thereby affecting the rapid charge and discharge performance of the battery. Disclosure of utility model In view of the above, the present utility model provides a separator, an electrode assembly, a battery, and an electrical device that overcome or at least partially solve the above problems. In order to solve the technical problems, the application is realized as follows: in a first aspect, an embodiment of the present application provides a separator, including: The structure layer comprises a base film and a solid electrolyte layer, and the solid electrolyte layer is arranged on at least one side of the base film; The bonding layer is provided with two and sets up respectively the both sides of structural layer, the bonding layer includes a plurality of cold pressing glue groups, the glue group that colds pressing is lattice form and distributes. Optionally, the coating radius of the cold-pressed glue mass is a,0cm < a is less than or equal to 0.5cm. Optionally, the interval between two adjacent cold-pressed rubber clusters is b,0cm < b is less than or equal to 1cm. Optionally, the thickness of the adhesive layer is c, and c is more than or equal to 0.5 μm and less than or equal to 10 μm Alternatively, the thickness of the solid electrolyte layer is d,0.5 μm≤d≤10 μm. Optionally, the solid electrolyte particles of the solid electrolyte layer have a particle size e of 0.1 μm≤e≤3 μm. Optionally, the structural layer further comprises a ceramic layer, and the ceramic layer is arranged on one side of the base film, which is opposite to the solid electrolyte layer. Optionally, the thickness of the ceramic layer is f, and f is more than or equal to 0.5 μm and less than or equal to 10 μm. Optionally, the ceramic particles of the ceramic layer have a particle size g,0.1 μm≤g≤3 μm. In a second aspect, an embodiment of the present application provides an electrode assembly, where the electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator as described in the first aspect, and the positive electrode sheet and the negative electrode sheet are respectively disposed on two sides of the separator. In a third aspect, embodiments of the present application provide a battery comprising an electrode assembly as described in the second aspect. In a fourth aspect, an embodiment of the present application proposes a powered device, comprising a battery as described in the third aspect. In an embodiment of the application, the separator includes a structural layer and an adhesive layer. The structure layer comprises a base film and a solid electrolyte layer, and the solid electrolyte layer is arranged on at least one side of the base film. The adhesive layer sets up in the both sides of structural layer, and the adhesive layer of every side all includes a plurality of cold pressing glue groups that are lattice distribution. The cold-pressed glue group can replace hot-pressed glue in the prior art to be bonded with the positive plate and the negative plate, so that a hot-pressing process is avoided being introduced in the production process, the production and processing cost of the battery is reduced, and the safety performance of the battery is guaranteed. The cold-pressed glue groups are arranged in a plurality of lattice shapes, so that the distribution area of the cold-pressed glue groups on the surface of the structural layer can be reduced while the bonding effect is ensured, and the air permeability of the diaphragm is increased, so that the impedance of the diaphragm is reduced. The solid electrolyte layer can improve the transmission efficiency of lithium ions when passing through the diaphragm, thereby reducing the direct current internal resistance of the battery. The solid electrolyte layer and the cold-pressed glue clusters distributed in a lattice mode can eliminate the influence