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JP-2026514264-A - Inner polarity poles, battery cells, and battery modules

JP2026514264AJP 2026514264 AJP2026514264 AJP 2026514264AJP-2026514264-A

Abstract

This invention relates to an inner pole, a battery cell, and a battery module, and belongs to the field of new energy. The inner pole includes a pole body, at least one pole connection projection, and at least one pole tab, the pole tab and pole connection projection being fixed to both sides of the pole body, respectively. The battery cell includes an inner pole. The battery module includes a battery cell. This invention enables precise mounting, reduces the difficulty of positioning, and improves assembly efficiency.

Inventors

  • ▲陳▼ ▲劍▼▲偉▼
  • 李 文▲亮▼
  • ▲楊▼ 新星
  • 黄 奕棋
  • 李 水源
  • ▲劉▼ ▲偉▼
  • 郭 元

Assignees

  • 孚能科技（▲ガン▼州）股▲フン▼有限公司

Dates

Publication Date
20260508
Application Date
20231027
Priority Date
20230227

Claims (18)

  1. It includes a pole column body, at least one pole column connecting projection, and at least one pole column tab, wherein the pole column tab and the pole column connecting projection are fixed to both sides of the pole column body, The pole column connecting projection has an injection hole that penetrates the pole column body and the pole column connecting projection. An inner pole column, wherein a conductive sheet is welded to each pole column tab, and a plating layer is provided on the outside of each pole column tab and the corresponding conductive sheet.
  2. The inner pole column according to claim 1, wherein there are multiple pole column tabs, the multiple pole column tabs are divided into at least one group of tabs arranged sequentially in the Y direction, at least two pole column tabs in each tab group are spaced apart along the Z direction, and two adjacent pole column tabs are offset in the Y direction.
  3. Including the case, outer poles, and inner poles, The inner pole post comprises a pole post body, at least one pole post connecting projection, and at least one pole post tab, the pole post tab and the pole post connecting projection being fixed to both sides of the pole post body, The inner pole is mounted inside the case, and the pole connecting projection penetrates the case and is fixedly connected to the outer pole located outside the case to conduct electricity. The pole column connecting projection has an injection hole that penetrates the pole column body and the pole column connecting projection. A battery cell having a conductive sheet welded to each of the pole tabs, and a plating layer on the outside of each of the pole tabs and the corresponding conductive sheet.
  4. The battery cell according to claim 3, wherein there are multiple pole column tabs, the multiple pole column tabs are divided into at least one group of tabs arranged sequentially in the Y direction, at least two pole column tabs of each tab group are spaced apart along the Z direction, and two adjacent pole column tabs are offset in the Y direction.
  5. The battery cell further comprises a rubber nail and a sealing top cover, wherein one of the pole-connecting projections in the inner pole has an injection hole that penetrates the pole body and the pole-connecting projection, the rubber nail is attached to one end of the injection hole facing the outside of the case, and the sealing top cover is fixedly connected to the pole-connecting projection to restrict the rubber nail, as described in claim 3.
  6. The battery cell according to claim 3, further comprising a cell stack assembly, the cell stack assembly being mounted within the case, the cell stack assembly comprising at least one cell stack, the inner poles located at the ends of the case, and the current collectors of the cell stack being connected in one-to-one correspondence with the pole tabs of the inner poles.
  7. The battery cell further includes a pressure plate, the case includes a base case and an upper cover, the upper cover has a pressure relief groove, the upper wall of the base case is open, the upper cover is fixedly connected to the base case by closing the opening in the upper wall of the base case, the pressure plate is located between the upper cover and the connection portion of the current collector corresponding to the uppermost pole column tab, the pressure plate has a relief groove, and the pressure relief groove is correspondingly located within the relief groove, as per claim 6.
  8. The battery cell according to claim 7, wherein the pole tab is plate-shaped, the base case is a rectangular parallelepiped with the upper wall being the largest surface area, and the pole tab is parallel to the upper cover.
  9. The battery cell according to claim 3, wherein the inner electrode posts are two in number, one being a positive electrode inner electrode post and the other a negative electrode inner electrode post; the outer electrode posts are two in number, one being a positive electrode outer electrode post and the other a negative electrode outer electrode post; the electrode post connecting projection of the positive electrode inner electrode post penetrates the case and connects to the positive electrode outer electrode post to conduct electricity; and the electrode post connecting projection of the negative electrode inner electrode post penetrates the case and connects to the negative electrode outer electrode post to conduct electricity.
  10. The battery cell further includes an inner insulating member, a positive electrode column conductive plastic member, and a negative electrode outer insulating member, wherein there are two inner insulating members. The two inner insulating members are fixed between the positive inner pole and the inner wall of the case, and between the negative inner pole and the inner wall of the case, The battery cell according to claim 9, wherein the positive electrode pole conductive plastic member is fixed between the positive electrode outer pole and the outer wall of the case, and the negative electrode outer insulating member is fixed between the negative electrode outer pole and the outer wall of the case.
  11. The battery cell according to claim 3, wherein the case is provided with a rupture mark.
  12. The battery cell according to claim 4, wherein the case is provided with a rupture mark.
  13. The battery cell according to claim 5, wherein the case is provided with a rupture mark.
  14. The battery cell according to claim 6, wherein the case is provided with a rupture mark.
  15. The battery cell according to claim 7, wherein the case is provided with a rupture mark.
  16. The battery cell according to claim 8, wherein the case is provided with a rupture mark.
  17. The battery cell according to claim 9, wherein the case is provided with a rupture mark.
  18. A battery module comprising the battery cell described in claim 3.

Description

This application claims priority to Chinese Patent Application No. 202310170501.3, entitled “Inner Electrode Column, Battery Cell, and Battery Module,” filed with the China National Intellectual Property Office on February 27, 2023, the entire contents of which are incorporated herein by reference. This invention relates to the field of battery manufacturing, and more specifically to inner electrode posts, battery cells, and battery modules. A battery cell generally includes a case, a top cover, and a core (or cell stack). The core is located inside the case, which has an opening at the top of the case. The poles on the top cover of the battery are connected to the current collectors of the core, and the core is then placed inside the case. The top cover of the battery is sealed at the opening at the top of the case by laser welding, and the poles formed on the top cover of the battery allow it to be electrically connected to external electronic components to supply power. Currently, determining the mounting positions of the polarity poles and top cover, and the winding core and polarity poles, is difficult, making the assembly of battery cells highly complex. When welding the top cover to the case, high precision is required in the assembly of the case and top cover, resulting in higher costs. This is a perspective view of the inner pole column according to the present invention.This is an exploded perspective view of the battery cell according to the present invention.Figure 2 is a magnified view of a portion of the battery cell.This is a front view of the battery cell according to the present invention.This is a plan view of a battery cell according to the present invention.Figure 5 is a left side view of the battery cell.Figure 5 is a partially enlarged view of the cross-sectional view of the battery cell along the D direction. The components represented by each symbol in the drawing are shown below. 100, Inner pole column; 101, Policing column body; 102, Policing column connecting projection; 103, Policing column tab; 104, Injection hole; 105, Positive inner pole column; 106, Negative inner pole column; 107, Conductive sheet; 200, Cell stack; 300, Case; 301, Base case; 302, Top cover; 303, Pressure relief groove; 400, Outer pole column; 401, Positive outer pole column; 402, Negative outer pole column; 500, Inner insulating member; 501, Positive inner insulating member; 502, Negative inner insulating member; 503, Restricting projection; 601, Positive pole column conductive plastic member; 602, Negative outer insulating member; 603, Rib; 700, Rubber nail; 800, Sealing top cover; 900, Pressure plate; 901, Separator; 1000, Mylar film. The principles and features of the present invention are described below, but the examples given are merely for interpretation purposes and do not limit the scope of the present invention. Example 1 As shown in Figure 1, this embodiment provides an inner pole post, the inner pole post 100 comprising a pole post body 101, at least one pole post connecting projection 102, and at least one pole post tab 103, the pole post tab 103 and the pole post connecting projection 102 being fixed to both sides of the pole post body 101, respectively. The pole tabs 103 of the inner pole post 100 are used to conduct electricity by connecting to the cell stack 200. The placement of the pole tabs 103 allows for the identification of the connection position between the cell stack 200 and the inner pole post 100, ensuring secure mounting. The pole post connection projections 102 protrude from the battery cell case 300 and are used to supply power to external electronic components. Furthermore, the relative position of the pole post connection projections 102 to the case 300 can be accurately determined, reducing the difficulty of positioning and improving assembly efficiency. Specifically, the pole column tab 103 extends outward from the pole column body 101 in the X direction and has a tab surface for conducting electricity by being connected to the current collector of the cell stack 200. Here, the number of pole column connecting protrusions 102 can be one or more. In one specific example, as shown in Figures 2 and 3, the number of pole column connecting protrusions 102 is two. Of course, in other examples, the number of pole column connecting protrusions 102 may be three or four or more. Here, there may be one or more pole column tabs 103. If there are multiple pole column tabs 103, the arrangement may be as follows: the multiple pole column tabs 103 are divided into at least one tab group sequentially arranged in the Y direction, and at least two of the pole column tabs 103 in each tab group are spaced apart along the Z direction, with two adjacent pole column tabs 103 offset in the Y direction. Since at least two pole column tabs 103 are spaced apart along the Z direction, in this way, when at least two cell stacks 200 are sequentially connected to at least two pole column tabs 103, a stack