Search

CN-224204208-U - Battery cell

CN224204208UCN 224204208 UCN224204208 UCN 224204208UCN-224204208-U

Abstract

The application provides a battery, which relates to the technical field of batteries and is used for solving the problems of high cost and poor sealing performance of a metal shell in the related art, and the battery comprises a battery core, a bottom shell, a sealing cover and a sealing adhesive layer, wherein the battery core comprises a battery core main body and a tab assembly extending from one side of the battery core main body; the battery cell is positioned in the sealing cavity, the sealing cover comprises a body and a side wall extending from one surface of the body, which is close to the bottom shell, the side wall surrounds the opening, a bending structure is arranged at the opening, the bending structure comprises a bending part and a flanging which are connected, the bending part is connected with the edge of the opening, the bending part and/or the flanging are connected with the side wall through a sealing adhesive layer, and at least one end of the sealing adhesive layer exceeds the overlapping area of the bending structure and the side wall. And a sealant layer is arranged between the bending structure and the sealing cover, so that the cost is reduced, the tightness of the battery is improved, and external water vapor is prevented from entering the sealing cavity.

Inventors

  • WEI ZHIDA
  • ZENG YUXIANG

Assignees

  • 珠海冠宇电池股份有限公司

Dates

Publication Date
20260505
Application Date
20250401

Claims (11)

  1. 1. The battery is characterized by comprising a battery core, a battery cover and a battery cover, wherein the battery core comprises a battery core main body and a tab assembly extending from one side of the battery core main body; a bottom case having an opening; The sealing cover is covered on the opening to form a sealing cavity in the bottom shell, and the battery cell is positioned in the sealing cavity; The sealing cover comprises a body and a side wall extending from one surface of the body, which is close to the bottom shell, wherein the side wall is arranged around the opening; the opening is provided with a bending structure, the bending structure comprises a bending part and a flanging which are connected, the bending part is connected with the edge of the opening, and the bending part and/or the flanging are connected with the side wall through a sealant layer; At least one end of the sealant layer exceeds the overlapping area of the bending structure and the side wall.
  2. 2. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells, The bending part comprises an arc-shaped bulge, the vertex of the arc-shaped bulge faces the body, one end of the arc-shaped bulge is connected with the edge of the opening, the other end of the arc-shaped bulge is connected with the head end of the flanging, and the tail end of the flanging extends away from the body; The intersection of the side wall and the body is provided with a first arc-shaped corner, one end of the sealant layer overflows from between the arc-shaped bulge and the first arc-shaped corner, and/or the other end of the sealant layer overflows from between the tail end of the flanging and the side wall.
  3. 3. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells, The bending part comprises a first horizontal connecting section, a second arc-shaped corner and a third arc-shaped corner, wherein the second arc-shaped corner and the third arc-shaped corner are arranged at two ends of the first horizontal connecting section, the second arc-shaped corner is connected with the edge of the opening, the third arc-shaped corner is connected with the head end of the flanging, and the tail end of the flanging is close to the body and extends; The flange surrounds the periphery of the side wall, and one end of the sealant layer overflows from the tail end of the flange to the side wall.
  4. 4. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells, The bending part comprises a first horizontal connecting section, a second arc-shaped corner and a third arc-shaped corner, wherein the second arc-shaped corner and the third arc-shaped corner are arranged at two ends of the first horizontal connecting section, the second arc-shaped corner is connected with the edge of the opening, the third arc-shaped corner is connected with the head end of the flanging, and the tail end of the flanging is close to the body and extends; The side wall surrounds the periphery of the flanging; the intersection of the side wall and the body is provided with a first arc-shaped corner, one end of the sealant layer overflows from the position between the tail end of the flanging and the first arc-shaped corner and extends to the body, and/or, And the other end of the sealant layer overflows from between the flanging and the side wall.
  5. 5. The battery of claim 4, wherein the battery is provided with a plurality of electrodes, The tail end of the flanging is also connected with a second horizontal connecting section opposite to the first horizontal connecting section, the second horizontal connecting section is connected with the body through the sealant layer, and one end of the sealant layer overflows from between the second horizontal connecting section and the body.
  6. 6. The battery of claim 4, wherein the battery is provided with a plurality of electrodes, The end part of the side wall, which is far away from the body, comprises a fastening flanging which is bent towards the sealing cavity, and the fastening flanging is attached to part of the first horizontal connecting section.
  7. 7. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells, The bottom shell comprises a bottom surface, the bottom surface is opposite to the body, a boss protruding towards the body is arranged on the bottom surface, and the boss is close to the edge of the bottom surface; The sealing cavity formed between the bottom surface and the body is a first accommodating cavity; The sealing cavity formed between the boss and the body is a second accommodating cavity, and the second accommodating cavity is communicated with the first accommodating cavity; The tab assembly comprises a positive tab and a negative tab, and the positive tab is positioned in the second accommodating cavity; The boss is also provided with a pole hole, a positive pole is penetrated in the pole hole, and the positive pole is connected with the positive pole lug; the negative electrode lug is connected with the sealing cavity.
  8. 8. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells, The surface of the sealant layer is provided with a nickel plating layer; the thickness of the nickel plating layer is 0.5um-5um.
  9. 9. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells, The sealing adhesive layer comprises a first adhesive layer, a second adhesive layer and a third adhesive layer which are sequentially laminated, and the melting points of the first adhesive layer, the second adhesive layer and the third adhesive layer are different; The difference between the highest melting point of the first glue layer and the lowest melting point of the third glue layer is larger than 15 ℃, and/or the melting point of the second glue layer is larger than the melting points of the first glue layer and the third glue layer.
  10. 10. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells, The battery cell main body comprises a plurality of positive plates, a plurality of negative plates, a positive soft lug extending from the edges of the positive plates and a negative soft lug extending from the edges of the negative plates, wherein the positive soft lug is welded with the positive hard lug, and the negative soft lug is welded with the bottom shell; the battery cell also comprises a protective gummed paper for covering the welding marks of the positive electrode soft lug and the positive electrode hard lug; In the thickness direction of the battery, the projection of the sealant layer beyond the overlapping area of the bending structure and the side wall is overlapped with the projection part of the positive electrode soft lug, and/or, And the projection of the sealant layer beyond the overlapping area of the bending structure and the side wall is not overlapped with the projection of the positive plate.
  11. 11. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells, The sealant layer covers the entire sealing cap, and/or, The width of the sealant layer beyond the overlapping area of the bending structure and the sidewall is <2mm, and/or, The height of the side wall is >0.5mm in the cell thickness direction, and/or The battery cell main body comprises a plurality of positive electrode plates and a plurality of negative electrode plates, wherein the negative electrode plates comprise a negative electrode current collector and a negative electrode active layer positioned on the negative electrode current collector.

Description

Battery cell Technical Field The application relates to the technical field of batteries, in particular to a battery. Background A metal-packed battery is a type of battery that uses a metal casing as a packaging material, the metal casing including a bottom case and a sealing cover, which are typically made of aluminum or steel, capable of providing a robust protection structure for the battery. In the related art, the sealing cover is welded on the bottom shell by adopting a laser welding mode, however, the manufacturing cost is high by adopting the laser welding mode, and the condition of missing welding or false welding can occur frequently, so that the sealing performance of the metal shell is poor. Disclosure of utility model In view of the above, embodiments of the present application provide a battery to solve the problems of high manufacturing cost and poor sealability of a metal case in the related art. In order to achieve the above object, the embodiment of the present application provides the following technical solutions: The embodiment of the application provides a battery, which comprises a battery core, a bottom shell, a sealing cover and a bending structure, wherein the battery core comprises a battery core main body and a tab assembly extending from one side of the battery core main body, the bottom shell is provided with an opening, the sealing cover covers the opening to form a sealing cavity in the bottom shell, the battery core is positioned in the sealing cavity, the sealing cover comprises a body and a side wall extending from one side of the body, which is close to the bottom shell, the side wall surrounds the opening, the bending structure is arranged at the opening and comprises a bending part and a flanging which are connected, the bending part is connected with the edge of the opening, the bending part and/or the flanging is connected with the side wall through a sealing glue layer, and at least one end of the sealing glue layer exceeds the overlapping area of the bending structure and the side wall. In one embodiment of the application, the bending part comprises an arc-shaped bulge, the vertex of the arc-shaped bulge faces the body, one end of the arc-shaped bulge is connected with the edge of the opening, the other end of the arc-shaped bulge is connected with the head end of the flanging, the tail end of the flanging extends away from the body, a first arc-shaped corner is arranged at the intersection of the side wall and the body, one end of the sealant layer overflows from between the arc-shaped bulge and the first arc-shaped corner, and/or the other end of the sealant layer overflows from between the tail end of the flanging and the side wall. In one embodiment of the application, the bending part comprises a first horizontal connecting section, a second arc-shaped corner and a third arc-shaped corner, wherein the second arc-shaped corner and the third arc-shaped corner are arranged at two ends of the first horizontal connecting section, the second arc-shaped corner is connected with the edge of the opening, the third arc-shaped corner is connected with the head end of the flanging, the tail end of the flanging is close to the body and extends, the flanging surrounds the periphery of the side wall, and one end of the sealant layer overflows from between the tail end of the flanging and the side wall. In one embodiment of the application, the bending part comprises a first horizontal connecting section, a second arc corner and a third arc corner, wherein the second arc corner and the third arc corner are arranged at two ends of the first horizontal connecting section, the second arc corner is connected with the edge of the opening, the third arc corner is connected with the head end of the flanging, the tail end of the flanging is close to the body and extends, the side wall surrounds the periphery of the flanging, the first arc corner is arranged at the intersection of the side wall and the body, one end of the sealant layer overflows from the position between the tail end of the flanging and the first arc corner and extends to the body, and/or the other end of the sealant layer overflows from the position between the flanging and the side wall. In one embodiment of the present application, a second horizontal connecting section opposite to the first horizontal connecting section is further connected to the tail end of the flange, the second horizontal connecting section is connected to the body through the sealant layer, and one end of the sealant layer overflows from between the second horizontal connecting section and the body. In one embodiment of the application, the end of the side wall remote from the body comprises a fastening flange bent towards the sealing cavity, and the fastening flange is fitted with a part of the first horizontal connecting section. In one embodiment of the application, the bottom shell comprises a bottom surface, the bottom surface is oppos