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CN-224217569-U - Battery cell and battery pack

CN224217569UCN 224217569 UCN224217569 UCN 224217569UCN-224217569-U

Abstract

The application discloses a battery cell and a battery pack, and relates to the technical field of batteries. The battery cell comprises a pole core and a bottom supporting plate, wherein the bottom supporting plate is arranged at the bottom of the pole core, the bottom supporting plate comprises a first plate body and a second plate body, the first plate body is arranged on at least part of the peripheral outer side of the second plate body in a surrounding mode, the first plate body is connected with the pole core, the second plate body is in contact with the pole core, and the porosity of the second plate body is larger than that of the first plate body. The bottom support plate is divided into two parts with different porosities, the first plate body surrounds at least part of the peripheral outer side of the second plate body, the first plate body is connected with the pole core to form a fixed support for the pole core by using the first plate body, and meanwhile, the porosity of the second plate body is larger than that of the first plate body, so that the second plate body can absorb impact energy through plastic deformation when impacted. Therefore, the whole weight of the bottom support plate can be reduced while the bottom support plate supports the pole core, the weight of the battery core is further reduced, and the reliability and the safety of the battery core can be improved.

Inventors

  • Ye Chengtao

Assignees

  • 欣旺达动力科技股份有限公司

Dates

Publication Date
20260508
Application Date
20250528

Claims (10)

  1. 1. The battery cell is characterized by comprising a pole core (10) and a bottom supporting plate (11), wherein the bottom supporting plate (11) is arranged at the bottom of the pole core (10), the bottom supporting plate (11) comprises a first plate body (111) and a second plate body (112), the first plate body (111) is circumferentially arranged on at least part of the peripheral outer side of the second plate body (112), the first plate body (111) is connected with the pole core (10), the second plate body (112) is in contact with the pole core (10), and the porosity of the second plate body (112) is larger than that of the first plate body (111).
  2. 2. The cell of claim 1, wherein the second plate (112) comprises a homogenized lattice structure.
  3. 3. The cell of claim 2, wherein the homogenized lattice structure of the second plate (112) is one of a Diamond type, a Double pyramid type, an Octet or a Star type lattice.
  4. 4. The cell according to claim 1, characterized in that the height direction of the cell is a first direction (X), the orthographic projection of the second plate (112) on a plane perpendicular to the first direction (X) being located within the orthographic projection of the bottom plate (11) on a plane perpendicular to the first direction (X).
  5. 5. The cell according to any of claims 1-4, wherein the thickness of the first plate (111) is equal to the thickness of the second plate (112).
  6. 6. The cell according to any one of claims 1 to 4, wherein the pole core (10) comprises a pole core body (101) and an insulating film (102), the insulating film (102) is coated on at least part of the outer peripheral surface of the pole core body (101), and the first plate body (111) is at least partially fixedly connected with the insulating film (102).
  7. 7. The battery cell according to claim 6, wherein a plurality of hot-melt portions (1111) are disposed in the first plate body (111), the plurality of hot-melt portions (1111) are arranged around the second plate body (112) at intervals, and the hot-melt portions (1111) are fixedly connected with the insulating film (102).
  8. 8. The cell according to claim 6, characterized in that positioning holes (113) are provided in the first plate (111) and/or the second plate (112), the positioning holes (113) being used for positioning the pole core (10).
  9. 9. The cell of claim 1, further comprising a housing (13) and an explosion-proof valve, the housing (13) having a receiving cavity, the bottom plate (11) and the pole piece (10) being both disposed within the receiving cavity, the bottom plate (11) being disposed between the pole piece (10) and a bottom of the receiving cavity, the explosion-proof valve being mounted in the housing (13), the explosion-proof valve corresponding to the second plate (112); And/or the first plate body (111) and the second plate body (112) are integrated or split-shaped parts.
  10. 10. A battery pack comprising the cell according to any one of claims 1 to 9.

Description

Battery cell and battery pack Technical Field The application belongs to the technical field of batteries, and particularly relates to a battery cell and a battery pack. Background With the wide application of batteries in the fields of mobile phones, digital products, notebook computers, unmanned aerial vehicles, aeromodelling, electric tools, military industry, new energy automobiles, portable energy storage and medical equipment and the like, the domestic battery industry has been rapidly developed. The battery cell comprises a pole core and a bottom supporting plate arranged at the bottom of the pole core, wherein the bottom supporting plate is used for supporting and fixing the pole core. In the related art, the weight of the bottom supporting plate is too large, and meanwhile, the absorption capacity of the bottom supporting plate on impact is poor, so that the pole core cannot be well protected. Disclosure of utility model The application aims to provide a battery cell and a battery pack, which can solve the problems that in the related art, the weight of a bottom supporting plate is too large, the absorption capacity of impact is poor, and the protection of a pole core cannot be well formed. In order to solve the technical problems, the application is realized as follows: In a first aspect, an embodiment of the application provides a battery cell, which comprises a pole core and a bottom supporting plate, wherein the bottom supporting plate is arranged at the bottom of the pole core, the bottom supporting plate comprises a first plate body and a second plate body, the first plate body is circumferentially arranged on at least part of the circumferential outer side of the second plate body, the first plate body is connected with the pole core, the second plate body is in contact with the pole core, and the porosity of the second plate body is larger than that of the first plate body. Optionally, the second plate comprises a homogenized lattice structure. Optionally, the homogenized lattice structure of the second plate is one of a Diamond type, double pyramid type, octet type or Star type lattice. Optionally, the height direction of the battery cell is a first direction, and the orthographic projection of the second plate body on a plane perpendicular to the first direction is located in the orthographic projection of the bottom support plate on a plane perpendicular to the first direction. Optionally, the thickness of the first plate body is equal to the thickness of the second plate body. Optionally, the pole core comprises a pole core body and an insulating film, the insulating film is coated on at least part of the peripheral surface of the pole core body, and the first plate body is at least partially fixedly connected with the insulating film. Optionally, a plurality of hot melt portions are arranged in the first plate body, the hot melt portions are arranged around the second plate body at intervals, and the hot melt portions are fixedly connected with the insulating film. Optionally, a positioning hole is formed in the first plate body and/or the second plate body, and the positioning hole is used for positioning the pole core. Optionally, the battery cell further includes a housing and an explosion-proof valve, the housing has a containing cavity, the bottom support plate and the pole core are both disposed in the containing cavity, the bottom support plate is disposed between the pole core and the bottom of the containing cavity, the explosion-proof valve is installed in the housing, and the explosion-proof valve corresponds to the second plate; And/or the first plate body and the second plate body are integrated or split forming parts. In a second aspect, an embodiment of the present application provides a battery pack, including a battery cell as described in any one of the above. In the embodiment of the application, the battery cell comprises a pole core and a bottom supporting plate, wherein the bottom supporting plate is arranged at the bottom of the pole core, the bottom supporting plate comprises a first plate body and a second plate body, the first plate body is arranged on at least part of the peripheral outer side of the second plate body in a surrounding mode, the first plate body is connected with the pole core, the second plate body is in contact with the pole core, and the porosity of the second plate body is larger than that of the first plate body. The bottom plate is divided into two parts with different porosities, the first plate body surrounds at least part of the peripheral outer side of the second plate body, the first plate body is connected with the insulating film of the pole core to form a fixed support for the pole core by using the first plate body, meanwhile, the larger the porosity is, the better the capability of absorbing impact energy is, the smaller the porosity is, the higher the strength is, the porosity of the second plate body is larger than that of th