JP-7857064-B2 - Cells, housings, battery modules, and battery packs

JP7857064B2JP 7857064 B2JP7857064 B2JP 7857064B2JP-7857064-B2

Inventors

趙功威

Assignees

株式会社ＡＥＳＣジャパン

Dates

Publication Date: 20260512
Application Date: 20241223
Priority Date: 20240208

Claims (13)

A housing having sides and a bottom, The composite layer comprises a shear prevention layer and a connecting layer, wherein the shear prevention layer is connected to the housing via the connecting layer, and at least one of the shear prevention layer and the connecting layer is an insulating layer, and the composite layer covers at least one of at least a portion of the side surface and at least a portion of the bottom surface. The aforementioned connecting layer is a photocuring layer or a temperature curing layer . A cell characterized by the following features.
The shear prevention layer and the connecting layer are each arranged as a single layer. Alternatively, the shear prevention layer and the connecting layer are arranged in multiple layers, and the multiple shear prevention layers and the multiple connecting layers are arranged in an alternating stacking arrangement. The cell according to claim 1, characterized in that it is a cell according to claim 1.
The shear prevention layer is a PET layer. And /or, when the shear prevention layer and the connecting layer are each arranged as one layer, the thickness range of both the shear prevention layer and the connecting layer is 40 to 60 μm. The cell according to claim 2, characterized in that
The shear strength of the composite layer is 1.4 MPa or more. and/or, the thickness range of the composite layer is 80 to 120 μm. A cell according to any one of claims 1 to 3, characterized in that
The composite layer covers the entire bottom surface, and/or, the composite layer covers a portion of the side surface, and the area on the side surface not covered by the composite layer is covered with gel. A cell according to any one of claims 1 to 3, characterized in that
The composite layers on the side surface and the bottom surface are arranged integrally. A cell according to any one of claims 1 to 3, characterized in that
The aforementioned side surface includes a first side surface and a second side surface, and the housing has two of the first side surfaces arranged opposite to each other, and two of the second side surfaces arranged opposite to each other. The first side and the second side are arranged to intersect each other, the area of the first side is larger than the area of the second side, and the composite layer covers at least a portion of the side, so both the first side and the second side are covered by the composite layer. A cell according to any one of claims 1 to 3, characterized in that
The composite layer covering the first side extends to the second side, covering a portion of the second side, and the area on the second side not covered by the composite layer is a window region, and the window region is covered with gel. The area of the window region occupies 40% to 80% of the area of the second side surface, and/or the gap between the bottom edge of the window region and the bottom surface is 5 mm or more. The cell according to claim 7, characterized in that
The composite layer has a folding region on the second side surface, and the composite layer is folded and arranged in the folding region. The cell according to claim 7, characterized in that
The maximum number of folded layers in the aforementioned folded region of the composite layer shall not exceed five layers. The cell according to claim 9, characterized in that it is a cell according to claim 9.
Having sides and a bottom, at least one of at least a portion of the sides and at least a portion of the bottom is covered with a composite layer. The composite layer includes a shear prevention layer and a connecting layer, the shear prevention layer is connected to the housing via the connecting layer, and at least one of the shear prevention layer and the connecting layer is an insulating layer. The aforementioned connecting layer is a photocuring layer or a temperature curing layer . A housing characterized by the following features.
A cell assembly comprising a cell according to any one of claims 1 to 3, wherein a plurality of the cells are arranged and the plurality of cells are connected to form a cell assembly. A battery module characterized by the following features.
The invention includes a battery box and a battery module according to claim 12, wherein the battery box has a housing cavity inside, and the battery module is disposed within the housing cavity. A battery pack characterized by the following features.

Description

This application relates to the technology of batteries, and more particularly to cells, housings, battery modules, and battery packs. With the development of new energy vehicles, the demand for power batteries continues to increase. A power battery pack typically consists of multiple battery modules, and each battery module is composed of multiple cells. In one method known to those skilled in the art, the surface of a cell is covered with an insulating film, and when the cells are connected to each other, the insulating film maintains insulation between two adjacent cells. To more clearly describe the embodiments of this application or the technical solutions of the prior art, the drawings necessary for describing the embodiments or the prior art are briefly introduced below. Clearly, the drawings in the following description are some embodiments of this application. Those skilled in the art can obtain other drawings based on these without any creative effort. This is a three-dimensional view of a cell provided by an embodiment of the present application.This is a front view of a cell provided according to an embodiment of the present application.This is a cross-sectional view at position A-A in Figure 2.This is a magnified view of position B in Figure 3.This is another drawing corresponding to Figure 4.This is a left side view of a cell provided according to an embodiment of the present application.This is a drawing of Figure 6 after the composite layer has been removed.This is another drawing corresponding to Figure 6. In methods known to those skilled in the art, when cells within a battery module are interconnected, an insulating film covering the cell surface maintains insulation between adjacent cells. However, conventional insulating films covering cell surfaces suffer from low shear strength. When a cell is subjected to shear force from the outside, the insulating film is prone to rupture, affecting the reliability of the cell during use. Based on the above problems, embodiments of the present invention provide a cell, a housing, a battery module, and a battery pack. Both the battery module and the battery pack include a cell. Here, the cell includes a housing and a composite layer, the composite layer includes a shear-resistant layer and a connecting layer, and the shear-resistant layer is connected to the housing via the connecting layer. At least one of the shear-resistant layer and the connecting layer is an insulating layer. The composite layer covers at least one of at least a portion of the side and at least a portion of the bottom surface of the housing. Therefore, after the shear-resistant layer is connected to the surface of the housing via the connecting layer, the shear strength of the composite layer covering the cell surface is ensured, thereby improving the reliability of the cell during use. To further clarify the purpose, technical solutions, and advantages of the embodiments of this application, the technical solutions in the embodiments of this application are described below clearly and completely, together with the drawings of the embodiments. Clearly, the embodiments described are part of, but not all, the embodiments of this application. All other embodiments derived by those skilled in the art without creative effort based on the embodiments of this application are within the scope of protection of this application. The technical solution of this application and how it solves the above-mentioned technical problems will be described in detail below using specific embodiments. The following specific embodiments can be combined with each other, and some of the same or similar concepts or processes may not be described again in some embodiments. The structure of the cell provided by the embodiment of this application will be described in detail below, using a combination of Figures 1 to 8. As shown in Figures 1 to 4, the cell provided by this embodiment of the present invention includes a housing 100. The housing 100 has a side surface 110 and a bottom surface 120. The housing 100 further has a top surface 130, and the side surface 110 is connected to the bottom surface 120 and the top surface 130. An electrolyte 600 is disposed inside the housing 100. The composite layer 200 includes a shear prevention layer 210 and a connecting layer 220. The shear prevention layer 210 is connected to the housing 100 via the connecting layer 220. At least one of the shear prevention layer 210 and the connecting layer 220 is an insulating layer. The composite layer 200 covers at least one of at least a portion of the side surface 110 and at least a portion of the bottom surface 120. The side surface 110 and bottom surface 120 of the housing 100 are susceptible to external forces, and after the composite layer 200 covers at least one of at least a portion of the side surface 110 and at least a portion of the bottom surface 120, the composite layer 200 can form protection against the side surfac