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JP-2026076113-A - Cover plate assembly and cell of secondary battery

JP2026076113AJP 2026076113 AJP2026076113 AJP 2026076113AJP-2026076113-A

Abstract

[Problem] The present invention provides a cover plate assembly and cell for a secondary battery that can prevent the lower insulating plate from twisting relative to the cover plate. [Solution] The cover plate assembly and cell of the secondary battery of the present invention include a cover plate having pole pole mounting holes, having a first side and a second side arranged opposite to each other along a first direction which is the thickness direction of the cover plate, a lower insulating plate located on the first side of the cover plate and having a through hole corresponding to the pole pole mounting hole, and a pole pole passing through the through hole and the pole pole mounting hole, wherein in a second direction perpendicular to the first direction, one of the pole pole and the lower insulating plate includes a convex portion, and the other of the pole pole and the lower insulating plate includes a concave portion that engages with the convex portion, and the pole pole further includes a main body portion, wherein in the second direction, the convex portion is formed by protruding from the main body portion, or the concave portion is formed by recessing from the main body portion. [Selection Diagram] Figure 4A

Inventors

  • 王 振

Assignees

  • 株式会社ＡＥＳＣジャパン

Dates

Publication Date
20260511
Application Date
20250926
Priority Date
20241023

Claims (16)

  1. A cover plate having pole mounting holes, the cover plate having a first side and a second side arranged opposite to each other along a first direction which is the thickness direction of the cover plate, A lower insulating plate located on the first side of the cover plate and having a through hole corresponding to the pole pole mounting hole, A pole that penetrates the aforementioned through hole and the pole pole mounting hole, Includes, In a second direction perpendicular to the first direction, one of the pole column and the lower insulating plate includes a protrusion, and the other of the pole column and the lower insulating plate includes a recess that engages with the protrusion. The pole column further includes a main body, and in the second direction, the convex portion is formed by protruding from the main body, or the recess is formed by recessing the main body. A cover plate assembly for a secondary battery, characterized by the following features.
  2. The projection of the protrusion onto the cover plate in the first direction includes at least one edge portion. The cover plate assembly for the secondary battery according to feature 1.
  3. The number of the aforementioned protrusions is one. The cover plate assembly for a secondary battery according to feature 2.
  4. The projection of the protrusion onto the cover plate in the first direction is an arc. The cover plate assembly for the secondary battery according to feature 1.
  5. The number of the aforementioned protrusions is 2 to 4. The cover plate assembly for a secondary battery according to feature 4.
  6. The length of the protrusion in the second direction is 1/15 to 1/8 of the length of the pole column in the second direction. The cover plate assembly for the secondary battery according to feature 1.
  7. The length range of the protrusion in the second direction is 1.8 to 3.0 mm. The cover plate assembly for a secondary battery according to feature 6.
  8. The lower insulating plate protrudes toward the side opposite to the cover plate to form a housing portion, and at least a part of the main body portion and the protrusion portion is located within the housing portion, or at least a part of the main body portion and the recess portion is located within the housing portion. In the plane perpendicular to the first direction, the housing portion has a shape that engages with the main body portion and the protrusion, or has a shape that engages with the main body portion and the recess. The cover plate assembly for the secondary battery according to feature 1.
  9. The lower insulating plate is positioned on the side facing the cover plate and further includes an electrical connection component that electrically connects the pole column and the electrode assembly, In the first direction, the housing portion of the lower insulating plate engages with the electrical connection component by its shape, at least partially. The cover plate assembly for a secondary battery according to feature 8.
  10. The shape of the main body is at least one of a triangle, a rhombus, or an ellipse. The cover plate assembly for a secondary battery according to feature 8.
  11. The lower insulating plate is positioned on the side facing the cover plate and further includes an electrical connection component that electrically connects the pole column and the electrode assembly, In the first direction, the side of the pole column facing away from the cover plate fits into the electrical connection component. The cover plate assembly for the secondary battery according to feature 1.
  12. The projection of the portion of the pole that fits into the electrical connection component onto the cover plate is circular. The cover plate assembly for a secondary battery according to feature 11.
  13. The portion of the pole that fits into the electrical connection component has a projection that overlaps with the main body and protrusion of the pole, or the projection that overlaps with the main body and recess of the pole. The cover plate assembly for a secondary battery according to feature 11.
  14. The pole pole mounting hole includes a first pole pole mounting hole and a second pole pole mounting hole, The through-hole includes a first through-hole corresponding to the first pole pole mounting hole and a second through-hole corresponding to the second pole pole mounting hole. The pole column includes a first pole column and a second pole column with opposite polarities, the first pole column passing through the first through hole and the first pole column mounting hole, and the second pole column passing through the second through hole and the second pole column mounting hole. In a second direction perpendicular to the first direction, the first pole column includes a first protrusion, the lower insulating plate includes a first recess that engages with the first protrusion, the second pole column includes a second recess, and the lower insulating plate includes a second protrusion that engages with the second recess. The cover plate assembly for the secondary battery according to feature 1.
  15. The length range of the cover plate is 100 to 350 mm. The cover plate assembly for the secondary battery according to feature 1.
  16. A housing having an opening, An electrode assembly disposed within the aforementioned housing, Includes a cover plate assembly according to any one of claims 1 to 15, The cover plate assembly seals the opening of the housing, The cover plate assembly includes a lower insulating plate, and the lower insulating plate is located on the first side of the cover plate that is closer to the electrode assembly. A cell characterized by the following features.

Description

This application relates to the battery technology field, and more specifically, to cover plate assemblies and cells for secondary batteries. Rechargeable batteries are widely used in electronic devices such as mobile phones, laptops, electric bicycles, electric vehicles, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes, and power tools. Currently, common rechargeable batteries include nickel-cadmium batteries, nickel-metal hydride batteries, lithium-ion batteries, and rechargeable alkaline zinc-manganese batteries. Of these, lithium-ion batteries have become the mainstream power battery for new energy vehicles due to their advantages such as high specific energy, high specific efficiency, long lifespan, and low cost. The cover plate assembly of a secondary battery includes a lower insulating plate to electrically insulate the electrode assembly from the cover plate. Fixing the position of the lower insulating plate is particularly important, as twisting or instability of its position relative to the cover plate can affect the sealing performance of the electrode poles. To more clearly illustrate the embodiments of this application or the prior art, the drawings used in the embodiments are briefly introduced below. Clearly, the drawings described below represent only a few embodiments of this application, and those skilled in the art can obtain other drawings based on these without any creative effort. This is an exploded view of a conventional cover plate assembly.This is an exploded view of a cover plate assembly according to one embodiment of the present invention.This is a bottom view of a cover plate assembly according to one embodiment of the present invention.This is a front view of a cover plate assembly and an electrode assembly according to one embodiment of the present invention.This is a bottom view of a pole column according to one embodiment of the present invention.This is an isometric side view of a pole column according to one embodiment of the present invention.This is a front view of a pole column according to one embodiment of the present invention.This is a bottom view of the lower insulating plate according to one embodiment of the present application.This is an isometric side view of a lower insulating plate according to one embodiment of the present application.This is a bottom view of the second insulating plate portion according to one embodiment of the present application.This is an isometric side view of the second insulating plate portion according to one embodiment of the present application.This is an exploded view of a cover plate assembly according to another embodiment of the present application.An isometric side view of a cover plate assembly according to another embodiment of the present application.This is a bottom view of the lower insulating layer and pole column of a cover plate assembly according to another embodiment of the present application.This is an isometric side view of the lower insulating layer and pole column of a cover plate assembly according to one embodiment of the present invention.This is an isometric side view of pole columns with opposite polarities in a cover plate assembly according to another embodiment.This is a bottom view of the first insulating plate portion and the second insulating plate portion of a cover plate assembly according to another embodiment.This is an isometric side view of the electrical connection component of a cover plate assembly according to another embodiment of the present application.An isometric side view of the pole column of a cover plate assembly according to another embodiment of the present application.An isometric side view of the pole column of a cover plate assembly according to another embodiment of the present application. The technical inventions of the embodiments of this application will be described clearly and completely below with reference to the drawings of the embodiments. Clearly, the embodiments described are only some, and not all, embodiments of this application. All other embodiments that a person skilled in the art can obtain based on the embodiments of this application are within the scope of protection of this application. The following disclosure provides many different embodiments or examples for realizing different features of the subject matter provided. Hereinafter, specific examples of elements and arrangements are described for the sake of brevity of the invention. Naturally, these are merely examples and are not intended to limit the invention. For example, in the following description, forming the first member above or on top of the second member may include embodiments in which the first and second members are in direct contact, and also include embodiments in which an additional member is formed between the first and second members, and the first and second members are not in direct contact. Furthermore, the invention may repeat ref