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CN-224232708-U - Battery monomer, battery device and power utilization device

CN224232708UCN 224232708 UCN224232708 UCN 224232708UCN-224232708-U

Abstract

The application discloses a battery monomer, a battery device and an electricity utilization device, and belongs to the technical field of batteries. The electrode terminal arranged on the first wall is electrically connected with the electrode assembly in the shell, the electrode terminal is arranged between the electrode assembly and the corresponding target surface, the target surface is arranged in an area surrounded by the radiating surface, and the target surface is used for installing the bus piece. The phase change device is laid on the outer side of the first wall and the outer side of the radiating surface. By the arrangement of the phase change device, heat is radiated to the electrode terminal and the case wall of the case facing the side of the corresponding electrode terminal.

Inventors

  • HUANG WEIHONG
  • XU LIANGFAN
  • ZHANG QIANQIAN
  • XU HU
  • LI XING

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20250403

Claims (17)

  1. 1. A battery cell, comprising: a housing comprising a first wall; An electrode assembly located within the housing; An electrode terminal provided on the first wall and electrically connected to the electrode assembly, the electrode terminal having a target surface exposed to the case and a heat radiation surface, the electrode terminal being located between the electrode assembly and the corresponding target surface, the target surface being located in an area surrounded by the heat radiation surface, the target surface being for mounting a bus bar; the phase change device is laid on the outer side of the first wall and the outer side of the radiating surface.
  2. 2. The battery cell of claim 1, wherein the phase change device comprises a phase change body for generating a phase change to dissipate heat from the electrode terminal in a normal operating state, the phase change body having a phase change temperature of 28 ℃ to 78 ℃.
  3. 3. The battery cell according to claim 1, wherein the phase change device comprises a phase change body for generating a phase change to dissipate heat from the electrode terminal in a normal operation state, and the phase change body is made of a crystalline hydrated salt or an organic phase change material.
  4. 4. The battery cell according to any one of claims 1 to 3, further comprising an insulating film, at least part of the insulating film is coated on the outer side of the first wall, the insulating film is provided with an avoidance port arranged on the first wall, and the electrode terminal and the phase change device are both located in the range of the avoidance port.
  5. 5. The battery cell according to any one of claims 1 to 3, wherein the first wall is an end cap, the housing further comprises a case, the end cap is covered on the case, the electrode assembly is located in a space defined by the end cap and the case, the phase-change device comprises a phase-change body for generating a phase change to dissipate heat from the electrode terminal in a normal operating state, and the phase-change body comprises: A first phase change body covering a side of the end cap facing away from the electrode assembly; and the second phase change body is covered on the outer side of the radiating surface and protrudes out of one side of the first phase change body, which is away from the electrode assembly.
  6. 6. A battery cell according to any one of claims 1 to 3, wherein the first wall has a liquid injection hole for injecting electrolyte into the housing, the battery cell further comprises a pressure release mechanism mounted on the first wall, and the phase change device is located outside the area where the liquid injection hole is located and the area where the pressure release mechanism is located.
  7. 7. A battery cell according to any one of claims 1 to 3, wherein the electrode terminal comprises: a first insulating member; A support skeleton partially within the first insulator, the support skeleton being connected to the first wall; And a main terminal electrically connected with the electrode assembly, the main terminal portion being mounted between the first wall and the first insulating member, the main terminal being exposed to the outside portion of the first insulating member.
  8. 8. The battery cell according to any one of claims 1 to 3, wherein the phase change device further comprises a holder and a phase change body for generating a phase change to dissipate heat to the electrode terminal in a normal operation state, the phase change body being provided to the holder to restrain the phase change body from being separated from the holder.
  9. 9. The battery cell of claim 8, wherein the holder has a receiving cavity in which the phase change body is located, or wherein the holder is a porous carrier capable of generating a capillary phenomenon.
  10. 10. The battery cell according to any one of claims 1 to 3, wherein the electrode assembly has a flat region, the electrode assembly includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode, the direction in which the positive electrode, the separator, and the negative electrode are stacked in the flat region is a thickness direction, and the dimension of the battery cell in the thickness direction is 25mm to 35mm.
  11. 11. A battery cell according to any one of claims 1 to 3, wherein the first wall is a bottom wall of the housing in the direction of gravity.
  12. 12. The battery cell according to any one of claims 1 to 3, wherein the electrode assembly has a tab electrically connected to the electrode terminal.
  13. 13. The battery cell of claim 12, further comprising an adapter member connected to the tab and the electrode terminal, respectively, to electrically connect the tab and the electrode terminal.
  14. 14. A battery cell according to any one of claims 1 to 3, wherein the portion of the electrode terminal located in the region surrounded by the heat dissipation surface is a solid structure.
  15. 15. A battery device, characterized by comprising: a case; The battery cell according to any one of claims 1-14, wherein the battery cell is installed in the box body, and the battery cell is used for storing or providing electric energy; and the converging piece is electrically connected with at least two battery monomers and is contacted with the target surface.
  16. 16. The battery device according to claim 15, wherein the bus bar is welded to the electrode terminal at the target surface; the phase change device is partially arranged on the bus piece and is positioned outside the welding area of the bus piece, or the phase change device is separated from contact with the bus piece.
  17. 17. An electrical device comprising a battery cell according to any one of claims 1 to 14 or a battery device according to claim 15 or 16, the battery cell or the battery device being adapted to store or provide electrical energy.

Description

Battery monomer, battery device and power utilization device Technical Field The present application relates to the field of battery technologies, and in particular, to a battery unit, a battery device, and an electric device. Background Batteries are increasingly used in life and industry, for example, new energy automobiles having the batteries mounted therein have been widely used, and in addition, the batteries are increasingly used in the field of energy storage and the like. In the related art, in the normal operation of the battery cell, the heat generation amount of the electrode terminal of the battery cell and the case wall of the case facing to one side of the corresponding electrode terminal is large. Disclosure of Invention In order to solve the technical problems, the application provides a battery cell, a battery device and an electric device, which are used for radiating heat to an electrode terminal and a shell wall of a shell facing one side of the corresponding electrode terminal in the normal working process of the battery cell. The application is realized by the following technical scheme. A first aspect of an embodiment of the present application provides a battery cell, including: a housing comprising a first wall; An electrode assembly located within the housing; an electrode terminal provided on the first wall and electrically connected to the electrode assembly, the electrode terminal having a target surface exposed to the case and a heat radiation surface, the electrode terminal being located between the electrode assembly and the corresponding target surface, the target surface being located in a region surrounded by the heat radiation surface, the target surface being for mounting a bus bar; the phase change device is laid on the outer side of the first wall and the outer side of the radiating surface. In the embodiment of the application, the phase change device is arranged on the outer side of the first wall, and the phase change device generates phase change in the normal working process of the battery cell to take away heat released by the structure used for electrically connecting the electrode assembly and the electrode terminal at the first wall. Because the target surface is positioned in the area surrounded by the heat dissipation surface, the heat dissipation surface is positioned at a position which is relatively outer to the electrode terminals in the direction perpendicular to the arrangement direction of the electrode assembly and the corresponding electrode terminals, so that the heat dissipation surface of the electrode terminals has a relatively large heat dissipation area, and heat dissipation is facilitated. The phase change device is arranged on the heat radiating surface and positioned at the outer side of the heat radiating surface, and the phase change device on the heat radiating surface is utilized to generate phase change in the normal working process of the battery cell and take away heat released by the electrode terminal through the heat radiating surface. Because the heat radiating surface is exposed out of the shell, the phase change of the phase change device arranged on the heat radiating surface does not basically influence the contact between the electrode terminal and the shell, and the battery cell can still basically keep normal operation in the phase change process of the phase change device. Therefore, under the condition that the normal operation of the battery cell is basically not affected by the arrangement of the phase change device, the embodiment of the application can radiate heat through the phase change device on the radiating surface with larger radiating area on the electrode terminal, thereby being beneficial to better radiating heat of the electrode terminal, and better radiating heat through the phase change device on the first wall on the structure for electrically connecting the electrode assembly and the electrode terminal. In some embodiments, the phase change device includes a phase change body for generating a phase change to dissipate heat from the electrode terminal in a normal operating state, the phase change body having a phase change temperature of 28 ℃ to 78 ℃. In the embodiment of the application, the phase-change temperature of the phase-change main body is 28-78 ℃, so that the phase-change temperature of the phase-change main body is proper, and the phase-change main body can basically generate phase-change absorption heat under the temperature condition of the battery monomer in the normal working state. In some embodiments, the phase change device comprises a phase change body for generating a phase change to dissipate heat of the electrode terminal in a normal operating state, wherein the phase change body is made of crystalline hydrated salt or organic phase change material. In the embodiment of the application, the phase transition temperature of the crystalline hydrated salt and the organic phase transi