Cell housing and cell

Abstract

The present invention relates to the technical field of batteries, and particularly to a battery cell housing and a battery cell. The battery cell housing includes a housing and a cover plate. The cover plate includes a plate body portion and a connecting portion surrounding the circumferential side wall of the plate body portion. The plate body portion is assembled in the accommodating cavity; the connecting portion includes a first connecting portion abutting against the cavity wall of the accommodating cavity and a second connecting portion spaced from the cavity wall of the accommodating cavity, so that the connecting portion is bent. One end of the connecting portion is connected to the plate body portion, and the other end of the connecting portion is formed as a sealing portion connected to the end of the housing. In the present invention, the connecting portion on the cover plate is bent twice, offsetting the deformation generated during the stress release process of the cover plate. One end of the connecting portion is connected to the plate body portion, and the other end is formed as a sealing portion connected to the end of the housing, ensuring reliable assembly of the cover plate and the housing, improving the assembly yield of the cover plate and the housing, as well as the welding quality and safety of the cover plate and the housing, thereby improving the production yield of the battery cell and reducing the production cost of the battery cell.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and more particularly to a battery cell housing and a battery cell. Background Art

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing day by day. The housing is an important part of the lithium battery, which is used to carry the electrode group of the battery cell and can be assembled and welded with the cover plate to form a sealed battery cell space. At present, the cover plate of the steel shell battery cell is bent in an L shape and assembled and welded with the housing. After the cover plate of the steel shell battery cell is bent and formed, the position of the bend expands outward due to the release of material stress, and the size of the stamping step assembled with the housing is difficult to control, resulting in poor housing-cover assembly, and the battery cell has problems of low production yield, low production efficiency and high cost. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a battery cell housing and a battery cell to solve the problem that the bent position of the cover plate of the existing steel shell battery cell is prone to expansion after being bent into an L shape, resulting in poor housing-cover assembly, and thus low production yield and low production efficiency of the battery cell.

[0004] The first aspect of the present invention provides a battery cell housing, which includes:

[0005] A housing, which internally forms a receiving cavity with an opening;

[0006] A cover plate, which includes a plate body portion and a connecting portion surrounding the circumferential side wall of the plate body portion. The plate body portion is assembled in the receiving cavity; the connecting portion includes a first connecting portion abutting against the cavity wall of the receiving cavity and a second connecting portion spaced from the cavity wall of the receiving cavity, so that the connecting portion is bent, and one end of the connecting portion is connected to the plate body portion, and the other end of the connecting portion is formed into a sealing portion connected to the end of the housing.

[0007] Preferably, the thickness dimension of the cover plate is T1, 0.2 mm ≤ T1 ≤ 0.4 mm, and / or the wall thickness dimension of the housing is T2, 0.1 mm ≤ T2 ≤ 0.3 mm.

[0008] Preferably, the connecting portion further includes a first rounded corner provided between the sealing portion and the second connecting portion, and the radius of the first rounded corner is R1, 0.5 mm ≤ R1 ≤ 1.2 mm.

[0009] Preferably, the connecting portion further includes a second rounded corner provided between the plate body portion and the first connecting portion, and the radius of the second rounded corner is R2, 0.5 mm ≤ R2 ≤ 1.2 mm.

[0010] Preferably, the distance between the second connecting portion and the cavity wall of the accommodating cavity is N, where 0.3 mm ≤ N ≤ 5 mm.

[0011] Preferably, the connecting portion further includes a third connecting portion disposed between the first connecting portion and the second connecting portion.

[0012] Preferably, the length dimension of the third connecting portion is L, the connecting portion further includes a third fillet disposed between the second connecting portion and the third connecting portion and a fourth fillet disposed between the first connecting portion and the third connecting portion. The radius of the third fillet is R3, the angle of the central angle of the third fillet is X, X ≤ 90°, the radius of the fourth fillet is R4, and N = (R3 - T1 + R4) × (1 - cosX) + L × sinX.

[0013] Preferably, the dimension of the connecting portion in the depth direction of the accommodating cavity is H, where 2.2 mm ≤ H ≤ 6 mm.

[0014] Preferably, the end of the sealing portion away from the second connecting portion is coplanar with the outer wall of the housing;

[0015] and / or, the material of the battery cell housing is steel.

[0016] A second aspect of the present invention provides a battery cell, including the battery cell housing according to any one of the above technical solutions.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] For the battery cell housing of the present invention, the cover plate includes a plate body portion and a connecting portion surrounding the circumferential side wall of the plate body portion. The plate body portion is assembled in the accommodating cavity of the housing; the connecting portion includes a first connecting portion abutting against the cavity wall of the accommodating cavity and a second connecting portion spaced from the cavity wall of the accommodating cavity, so that the connecting portion is bent twice, offsetting the deformation generated during the stress release process of the cover plate. One end of the connecting portion is connected to the plate body portion, and the other end forms a sealing portion connected to the end of the housing, ensuring reliable assembly of the cover plate and the housing, improving the assembly yield of the cover plate and the housing, as well as the welding quality and safety of the cover plate and the housing, thereby improving the production yield of the battery cell and reducing the production cost of the battery cell.

[0019] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 Schematic structural diagram of the battery cell housing provided by an embodiment of the present invention;

[0022] Figure 2 Schematic structural diagram of the battery cell housing provided by an embodiment of the present invention from another perspective;

[0023] Figure 3 Along Figure 2 Cross-sectional view taken along the A-A line in

[0024] Figure 4 For Figure 3 Enlarged structural diagram at position B in

[0025] Reference numerals: 10 - housing; 11 - accommodating cavity; 20 - cover plate; 21 - plate body part; 22 - connecting part; 221 - first connecting part; 222 - second connecting part; 223 - third connecting part; 224 - sealing part; 225 - first rounded corner; 226 - second rounded corner; 227 - third rounded corner; 228 - fourth rounded corner; 30 - pole post. Specific Embodiments

[0026] The following specific embodiments are provided to assist the reader in obtaining a comprehensive understanding of the methods, devices, and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent. For example, the order of the operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, changes that will be apparent after understanding the disclosure of the present application can be made, except for operations that must occur in a specific order. In addition, for the sake of clarity and conciseness, descriptions of features known in the art may be omitted.

[0027] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices, and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0028] Throughout the specification, when an element such as a layer, region, or substrate is described as being "on" another element, "connected to" another element, "coupled to" another element, "above" another element, or "covering" another element, it can be directly "on" the other element, "connected to" the other element, "coupled to" the other element, "above" the other element, or "covering" the other element, or there can be one or more other elements intervening therebetween. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly coupled to" another element, "directly above" another element, or "directly covering" another element, there can be no other elements intervening therebetween.

[0029] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0030] Although terms such as "first", "second", and "third" may be used herein to describe various components, elements, regions, layers, or parts, these components, elements, regions, layers, or parts are not limited by these terms. Rather, these terms are only used to distinguish one component, element, region, layer, or part from another. Thus, the first component, element, region, layer, or part described in the examples herein could also be termed the second component, element, region, layer, or part without departing from the teachings of the examples.

[0031] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another as shown in the figures. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as "above" or "upper" relative to another element will then be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientation of "above" and "below" depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relationship terms used herein will be interpreted accordingly.

[0032] The terms used herein are for describing various examples only and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. The terms "comprising," "including," and "having" enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the existence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0033] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Accordingly, the examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing.

[0034] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible, as will be apparent after understanding the disclosure of the present application.

[0035] According to a first aspect of the present invention, a battery cell housing is provided, which includes a housing 10 and a cover plate 20.

[0036] Hereinafter, the specific structure of the battery cell housing according to the present embodiment will be described as above.

[0037] In the present embodiment, as Figures 1 to 3 shown, an accommodation cavity 11 with an opening is formed inside the housing 10 for accommodating components such as a pole group disposed inside the battery cell. The cover plate 20 is assembled to the opening to close the accommodation cavity 11. The cover plate 20 is welded to the housing 10. A protruding pole 30 is provided on the cover plate 20, and the pole 30 is connected to a tab on the pole group to achieve power transmission.

[0038] In the present embodiment, as Figure 2 and Figure 3 shown, the cover plate 20 includes a plate body portion 21 and a connecting portion 22 surrounding the circumferential side wall of the plate body portion 21. The plate body portion 21 is formed into a plate-like structure. The plate body portion 21 is assembled inside the accommodation cavity 11 such that the plate body is embedded in the housing 10 to a preset depth. The connecting portion 22 is provided on the side of the plate body portion 21 facing the outside of the battery cell and is formed into an annular structure capable of abutting against the cavity wall of the accommodation cavity 11. In this way, a groove is formed at one end of the cover plate 20 facing the outside of the battery cell. The plate body portion 21 is the bottom of the groove, and the connecting portion 22 is the wall of the groove.

[0039] Specifically, as Figure 3 and Figure 4As shown, the connecting portion 22 includes a first connecting portion 221 abutting against the wall of the accommodating cavity 11 and a second connecting portion 222 spaced from the wall of the accommodating cavity 11, such that the connecting portion 22 is bent twice, thus offsetting the deformation generated during the stress release process of the cover plate 20. One end of the connecting portion 22 is connected to the plate body portion 21, and the other end of the connecting portion 22 is formed into a sealing portion 224 connected to the end of the housing 10, eliminating the stamping step on the traditional steel shell cover plate 20, ensuring reliable assembly of the cover plate 20 and the housing 10, improving the assembly yield of the cover plate 20 and the housing 10, as well as the welding quality and safety of the cover plate 20 and the housing 10, thereby improving the production yield of the battery cell and reducing the production cost of the battery cell.

[0040] Preferably, as Figure 3 and Figure 4 shown, the end of the sealing portion 224 away from the second connecting portion 222 is coplanar with the outer wall of the housing 10, thus ensuring effective overlap of the cover plate 20 and the housing 10 and facilitating welding of the cover plate 20 and the housing 10. In this embodiment, the sealing portion 224 is formed into an annular plate-like structure parallel to the plate body portion 21.

[0041] In this embodiment, the material of the cover plate 20 is steel, such as stainless steel, specifically 304 stainless steel, and the cover plate 20 is formed by stamping and bending with a mold. Preferably, the material of the housing 10 is also steel.

[0042] In a preferred embodiment, as Figure 4 shown, the thickness dimension of the cover plate 20 is T1, 0.2 mm ≤ T1 ≤ 0.4 mm, so as to facilitate the forming of the cover plate 20 and ensure that the formed cover plate 20 has sufficient structural strength, meet the welding requirements and avoid occupying excessive space of the battery cell due to too large size. In this embodiment, the wall thickness dimension of the housing 10 is T2, 0.1 mm ≤ T2 ≤ 0.3 mm, so as to ensure that the housing 10 can protect the components inside the battery cell and meet the welding connection requirements between the housing 10 and the cover plate 20.

[0043] In this embodiment, as Figure 3 and Figure 4 shown, the connecting portion 22 further includes a first rounded corner 225 provided between the sealing portion 224 and the second connecting portion 222 to achieve a smooth transition between the sealing portion 224 and the second connecting portion 222 and avoid stress concentration. The radius of the first rounded corner 225 is R1, 0.5 mm ≤ R1 ≤ 1.2 mm, which helps to release stress and is convenient for processing.

[0044] Furthermore, in this embodiment, as Figure 3 and Figure 4As shown, the connecting portion 22 further includes a second rounded corner 226 disposed between the plate body portion 21 and the first connecting portion 221 to achieve a smooth transition between the plate body portion 21 and the second connecting portion 222. The radius of the second rounded corner 226 is R2, where 0.5 mm ≤ R2 ≤ 1.2 mm, which helps to release stress and is convenient for processing.

[0045] In this embodiment, as Figure 3 and Figure 4 shown, the distance between the second connecting portion 222 and the cavity wall of the accommodating cavity 11 is N, where 0.3 mm ≤ N ≤ 5 mm, to ensure that the sealing portion 224 and the housing 10 are effectively overlapped at one end in the depth direction of the accommodating cavity 11 to meet the assembly requirements of the patch on the cover plate 20 to form effective protection, and to ensure that the connecting portion 22 has sufficient structural strength so that it is not easily deformed during the assembly process with the housing 10.

[0046] It should be noted that Figure 3 the vertical direction in the perspective is the depth direction of the accommodating cavity 11.

[0047] In this embodiment, as Figure 4 shown, the connecting portion 22 further includes a third connecting portion 223 disposed between the first connecting portion 221 and the second connecting portion 222, such that the first connecting portion 221 and the second connecting portion 222 are spaced apart in the depth direction of the accommodating cavity 11, ensuring that the connecting portion 22 after secondary bending can effectively offset the deformation during the stress release process.

[0048] Further, in this embodiment, as Figure 4 shown, the length dimension of the third connecting portion 223 is L. The connecting portion 22 further includes a third rounded corner 227 disposed between the second connecting portion 222 and the third connecting portion 223 and a fourth rounded corner 228 disposed between the first connecting portion 221 and the third connecting portion 223, thus achieving a smooth transition between the second connecting portion 222 and the third connecting portion 223 and between the first connecting portion 221 and the third connecting portion 223, facilitating bending and forming and avoiding stress concentration. The radius of the third rounded corner 227 is R3, the angle of the central angle of the third rounded corner 227 is X, X ≤ 90°. The radius of the fourth rounded corner 228 is R4. In this embodiment, the calculation method for the distance N between the second connecting portion 222 and the cavity wall of the accommodating cavity 11 is: N = (R3 - T1 + R4) × (1 - cosX) + L × sinX.

[0049] In this embodiment, as Figure 4 shown, the dimension of the connecting portion 22 in the depth direction of the accommodating cavity 11 is H, where 2.2 mm ≤ H ≤ 6 mm, so as to facilitate the bending of the connecting portion 22 and avoid the situation that an excessive size will occupy the space of the accommodating cavity 11 and reduce the cell capacity. In this embodiment, as Figure 4As shown in the figure, the calculation method for the dimension H of the connecting portion 22 in the depth direction of the accommodating cavity 11 is: H = R1 + R2 + Y1 + Y2 + L×cosX + (R3 - T1 + R4)×sinX, where Y1 is the dimension of the second connecting portion 222 in the depth direction of the accommodating cavity 11, and Y2 is the dimension of the first connecting portion 221 in the depth direction of the accommodating cavity 11.

[0050] Next, the cover plate 20 with different dimensions is assembled with the housing 10 with the same dimensions to detect the assembly quality of the housing 10 and the cover plate 20. The detection results are shown in Table 1 below.

[0051] Table 1

[0052]

[0053] Note: In the table, the detection result of "OK" indicates that the cover plate 20 and the housing 10 are assembled qualified, and the detection result of "NG" indicates that the cover plate 20 and the housing 10 are assembled unqualified.

[0054] In Embodiment 1, Embodiment 2, Embodiment 6, and Embodiments 8 to 11, each parameter is within the defined range, and the cover plate 20 and the housing 10 are assembled qualified. However, in Embodiment 3, the cover plate 20 occupies too much space in the accommodating cavity 11, which is not conducive to the design of the battery cell capacity, and the bending strength of the cover plate 20 is poor, and it is easy to deform, affecting its assembly with the housing 10. In Embodiment 4, the distance between the second connecting portion 222 and the cavity wall of the accommodating cavity 11 is too large, affecting the assembly and protection of the patch and the cover plate 20, and the service life of the mold for stamping the cover plate 20 is low, and the development cost is high. In Embodiment 5, the bending strength of the cover plate 20 is poor, it is easy to deform, and the welding yield of the cover plate 20 and the housing 10 is low. In Embodiment 7, the bending strength of the cover plate 20 is poor, it is easy to deform, and the mold is easy to wear and has a lower service life.

[0055] According to an electric core housing provided by the present invention, it includes a cover plate and a housing. The cover plate includes a plate body portion and a connecting portion surrounding the circumferential side wall of the plate body portion. The plate body portion is assembled in the accommodating cavity of the housing; the connecting portion includes a first connecting portion abutting against the cavity wall of the accommodating cavity and a second connecting portion spaced from the cavity wall of the accommodating cavity, so that the connecting portion is bent twice to present an S-shaped cross-section, offsetting the deformation generated during the stress release process of the cover plate. One end of the connecting portion is connected to the plate body portion, and the other end is formed into a sealing portion connected to the end of the housing, ensuring reliable assembly of the cover plate and the housing, improving the assembly yield of the cover plate and the housing, as well as the welding quality and safety of the cover plate and the housing.

[0056] According to an electric core provided by the present invention, it includes the above-mentioned electric core housing. The cover plate and the housing are assembled reliably, thus improving the assembly yield of the cover plate and the housing, thereby improving the production yield of the electric core and reducing the production cost of the electric core.

[0057] Finally, it should be noted that the above-described embodiments are only specific implementation manners of the present application, used to illustrate the technical solutions of the present application, rather than limiting it. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any person skilled in the technical field of the present application can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery cell housing, characterized in that, The battery cell housing includes: a housing, which has an accommodating cavity with an opening formed therein; a cover plate, including a plate body portion and a connecting portion surrounding the circumferential side wall of the plate body portion, the plate body portion being assembled in the accommodating cavity; the connecting portion includes a first connecting portion abutting against the cavity wall of the accommodating cavity and a second connecting portion spaced from the cavity wall of the accommodating cavity, such that the connecting portion is bent, and one end of the connecting portion is connected to the plate body portion, and the other end of the connecting portion is formed into a sealing portion connected to the end of the housing; the thickness dimension of the cover plate is T1, and the wall thickness dimension of the housing is T2; 0.2 mm ≤ T1 ≤ 0.4 mm, and / or 0.1 mm ≤ T2 ≤ 0.3 mm; the distance between the second connecting portion and the cavity wall of the accommodating cavity is N, 0.3 mm ≤ N ≤ 5 mm; the connecting portion further includes a third connecting portion disposed between the first connecting portion and the second connecting portion; the length dimension of the third connecting portion is L, the connecting portion further includes a third fillet disposed between the second connecting portion and the third connecting portion and a fourth fillet disposed between the first connecting portion and the third connecting portion, the radius of the third fillet is R3, the central angle of the third fillet is X, X ≤ 90°, the radius of the fourth fillet is R4, and N = (R3 - T1 + R4) × (1 - cosX) + L × sinX; 2. The cell housing according to claim 1, characterized in that, the connecting portion further includes a first fillet disposed between the sealing portion and the second connecting portion, the radius of the first fillet is R1, 0.5 mm ≤ R1 ≤ 1.2 mm; 3. The cell housing according to claim 1, wherein the connecting portion further includes a second fillet disposed between the plate body portion and the first connecting portion, the radius of the second fillet is R2, 0.5 mm ≤ R2 ≤ 1.2 mm; 4. The cell housing according to claim 1, wherein, the dimension of the connecting portion in the depth direction of the accommodating cavity is H, 2.2 mm ≤ H ≤ 6 mm; 5. The cell housing according to claim 1, characterized in that, the end of the sealing portion away from the second connecting portion is coplanar with the outer wall of the housing; and / or, the material of the cover plate is steel.

6. A battery cell, characterized in that, including the battery cell housing according to any one of claims 1 to 5.

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