Battery cell shell, battery cell and battery cell module

Abstract

The utility model provides a battery cell shell, a battery cell and a battery cell module, and relates to the field of battery cell structures. The battery cell shell comprises a main body; the cover plate assembly is positioned at the end part of the main body; the cover plate assembly comprises a lower plastic part, assembling parts are arranged at the two ends of the lower plastic part in the length direction, each assembling part comprises a plurality of elastic pieces, and when the cover plate assembly and the main body are assembled, the elastic pieces abut against the inner walls of the two ends of the main body in the length direction.

Description

Technical Field

[0001] The present application relates to the field of battery cell structures, and in particular to a battery cell shell, a battery cell and a battery cell module. Background Art

[0002] The cover plate assembly and the shell in the square battery cell are often connected by laser welding. However, when the gap between the welding surface of the shell and the cover plate assembly is large, defects such as explosion points and pinholes are prone to occur. When the gap between the welding surfaces is small, it will increase the difficulty of assembly, and aluminum wire is prone to appear during the assembly process, affecting the performance of the battery cell. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide a battery cell shell, a battery cell and a battery cell module to solve the problem that the gap between the welding surfaces of the cover plate assembly and the shell in the existing battery cell is difficult to adjust when the cover plate assembly and the shell are assembled.

[0004] According to the above purpose, the utility model provides a battery cell shell, wherein the battery cell shell comprises:

[0005] main body;

[0006] A cover plate assembly is located at the end of the main body; the cover plate assembly includes a lower plastic part, and both ends of the lower plastic part in the length direction are provided with assembly parts, and the assembly parts include a plurality of spring pieces, and the spring pieces are formed with a free end and a fixed end connected to the lower plastic part;

[0007] When the cover plate assembly is assembled with the main body, the free end abuts against the inner walls at both ends of the main body in the length direction.

[0008] Preferably, the assembly portion includes a plurality of recesses located on the end surface of the lower plastic part in the length direction; at each end surface of the lower plastic part, the plurality of recesses are arranged at intervals along the width direction of the lower plastic part.

[0009] Preferably, each of the recesses is formed into a U-shaped open structure; and along the length direction of the lower plastic part, each of the recesses is open in a direction away from the middle of the lower plastic part.

[0010] Preferably, the spring pieces are connected to the recesses in a one-to-one correspondence.

[0011] Preferably, the spring sheet is formed with a matching section, a guiding section and a connecting section which are connected in sequence, so that the spring sheet forms a L-shaped structure.

[0012] Preferably, the matching section is parallel to the inner wall of the main body, the guiding section and the matching section form an angle, and the connecting section is connected to the bottom end of the bottom of the recess.

[0013] Preferably, along the width direction of the lower plastic part, the width of the spring sheet is smaller than the width of the recess, and gaps are formed between the two ends of the spring sheet in the width direction and the corresponding inner walls of the recess respectively.

[0014] Preferably, the assembly portion further comprises grooves located at both ends of the length direction of the lower plastic part, the openings of the grooves are located at the top of the lower plastic part; along the length direction of the lower plastic part, the recess is formed on the outer end surface of the groove away from the middle of the lower plastic part.

[0015] According to a second aspect of the utility model, a battery cell is provided, wherein the battery cell comprises the battery cell shell as described above.

[0016] According to a third aspect of the utility model, a battery cell module is provided, wherein the battery cell module is provided with the battery cell as described above.

[0017] According to the battery cell shell, battery cell and battery cell module of the utility model, assembly parts are set at both ends of the length direction of the lower plastic part in the cover plate assembly, and the assembly part includes a plurality of spring sheets, and when the cover plate assembly is assembled with the main body, the spring sheets can abut against the inner walls at both ends of the length direction of the main body, so that the cover plate assembly can be accurately positioned relative to the main body, so that the gap size between the welding surface of the cover plate assembly and the main body can be accurately controlled, effectively improving the production efficiency and production quality.

[0018] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a partial cross-sectional view of a battery cell housing according to an embodiment of the utility model;

[0021] Figure 2 is a schematic diagram of a lower plastic part according to an embodiment of the utility model;

[0022] Figure 3 It is a top view of the lower plastic part A according to an embodiment of the utility model;

[0023] Figure 4 It is a partial cross-sectional view of the lower plastic part according to an embodiment of the utility model.

[0024] Icon: 1-main body; 2-cover assembly; 20-lower plastic part; 201-assembly part; 202-groove; 203-reinforcement rib; 204-recess; 205-spring; 2051-matching section; 2052-guide section; 2053-connecting section; 206-gap. DETAILED DESCRIPTION

[0025] The following specific embodiments are provided to help the reader obtain 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 operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0026] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been 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.

[0027] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0028] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0029] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0030] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations 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 relational terms used herein will be interpreted accordingly.

[0031] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0032] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0033] 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.

[0034] According to the utility model, a battery cell shell is provided, such as Figures 1 to 4As shown, the battery cell housing in this embodiment includes a main body 1 and a cover plate assembly 2, and the cover plate assembly 2 is assembled at the end of the main body 1. The cover plate assembly 2 includes a lower plastic part 20, and both ends of the lower plastic part 20 in the length direction are provided with an assembly part 201. The assembly part 201 can accurately control the gap between the welding surfaces of the cover plate assembly 2 and the main body 1 after they are assembled, thereby improving the welding quality of the two to ensure the production efficiency and production quality of the battery cell. In the following, the specific structure of the above-mentioned parts of the battery cell housing according to the utility model will be described in detail.

[0035] like Figure 1 to Figure 2 As shown, the assembly part 201 in this embodiment is symmetrically arranged at both ends of the length direction of the lower plastic part 20 to avoid deflection during the assembly of the cover plate assembly 2. Specifically, the assembly part 201 includes grooves 202 located at both ends of the length direction of the lower plastic part 20, the opening of the groove 202 is located at the top of the lower plastic part 20, and the groove 202 protrudes from the bottom surface of the lower plastic part 20 to facilitate contact with the pole group. Furthermore, a plurality of reinforcing ribs 203 are also arranged inside the groove 202 to increase the stability and structural strength of the assembly part 201.

[0036] In addition, the assembly portion 201 further includes a plurality of recesses 204 located at the end surface of the lower plastic part 20 in the length direction. Further, along the length direction of the lower plastic part 20, the recesses 204 are formed at the outer end surface of the groove 202 away from the middle of the lower plastic part 20 (the middle of the lower plastic part 20 actually refers to the center of its length direction). Specifically, each recess 204 is formed as a U-shaped open structure; and along the length direction of the lower plastic part 20, each recess 204 is open in a direction away from the middle of the lower plastic part 20; more specifically, at each end surface of the lower plastic part 20, a plurality of recesses 204 are arranged at intervals along the width direction of the lower plastic part 20.

[0037] It should be noted that there is no specific restriction on the specifications of the groove 202, and there is no specific restriction on the specifications, quantity and setting position of the recess 204 (for example, in this embodiment, two recesses 204 are set at both ends of the lower plastic part 20), as long as they can cooperate with the following spring piece 205 to achieve the technical effect of abutting against the inner wall of the main body 1.

[0038] In this embodiment, the assembly portion 201 further includes a plurality of spring pieces 205, and the spring pieces 205 are connected to the above-mentioned recesses 204 in a one-to-one correspondence. Figure 4As shown, each spring piece 205 is formed with a matching section 2051, a guide section 2052 and a connecting section 2053 which are connected in sequence, so that the spring piece 205 is formed into a L-shaped structure; the matching section 2051 is parallel to the inner wall of the main body 1, the guide section 2052 forms an angle with the matching section 2051, that is, the guide section 2052 is inclined, and the connecting section 2053 is connected to the bottom end of the bottom of the recess 204. The guide section 2052 can improve the smoothness of the assembly of the cover plate assembly 2 and the main body 1, so as to avoid the situation that the cover plate assembly 2 cannot be assembled due to the deviation caused by the accuracy of the equipment (the equipment refers to the equipment used to assemble the cover plate assembly 2 and the shell correspondingly); and when the cover plate assembly 2 is assembled with the main body 1, the matching section 2051 can be in contact with the inner wall of the main body 1, so as to accurately control the size of the gap 206 between the welding surfaces of the cover plate assembly 2 and the main body 1, and effectively improve the production efficiency and production quality.

[0039] It should be noted that the assembly of the lower plastic part 20 with other components to form the cover assembly 2 is a conventional technical means in the art, so it will not be described in detail. In addition, the welding surface of the cover assembly 2 and the main body 1 and the end surface of the above-mentioned matching section 2051 are at different positions, so the position of the welding surface of the cover assembly 2 is adjusted based on the matching section 2051, that is, the size of the gap 206 between the welding surfaces of the cover assembly 2 and the main body 1 can be accurately controlled.

[0040] Furthermore, along the width direction of the lower plastic part 20, the width of the spring piece 205 is smaller than the width of the corresponding recess 204, and gaps 206 are formed between the two ends of the spring piece 205 in the width direction and the corresponding inner walls of the recess 204. Through the cooperation of the gap 206 and the above-mentioned connecting section 2053, the spring piece 205 has a certain structural strength, so as to facilitate the assembly positioning with the main body 1.

[0041] It should be noted that the spring piece 205 is made of the same plastic material as the lower plastic part 20 , and combined with its bent structure, it has a certain elasticity to achieve the technical effect of assembly positioning.

[0042] According to the battery cell shell of the present invention, assembly parts 201 are set at both ends of the length direction of the lower plastic part 20 in the cover plate assembly 2, and the assembly part 201 includes a plurality of spring pieces 205, and when the cover plate assembly 2 is assembled with the main body 1, the spring pieces 205 can abut against the inner walls at both ends of the length direction of the main body 1, so that the cover plate assembly 2 can be accurately positioned relative to the main body 1, so that the size of the gap 206 between the welding surfaces of the cover plate assembly 2 and the main body 1 can be accurately controlled, thereby effectively improving the production efficiency and production quality.

[0043] According to a second aspect of the utility model, a battery cell is provided, wherein the battery cell comprises the battery cell shell as described above.

[0044] According to a third aspect of the utility model, a battery cell module is provided, wherein the battery cell module is provided with the battery cell as described above.

[0045] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; 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 be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A battery cell casing, characterized in that: The battery cell housing comprises: main body; A cover plate assembly is located at the end of the main body; the cover plate assembly includes a lower plastic part, and both ends of the lower plastic part in the length direction are provided with assembly parts, and the assembly parts include a plurality of spring pieces, and the spring pieces are formed with a free end and a fixed end connected to the lower plastic part; When the cover plate assembly is assembled with the main body, the free end abuts against the inner walls at both ends of the main body in the length direction.

2. The battery cell casing according to claim 1, characterized in that: The assembly portion includes a plurality of recesses located on the end surface of the lower plastic part in the length direction; at each end surface of the lower plastic part, the plurality of recesses are arranged at intervals along the width direction of the lower plastic part.

3. The battery cell casing according to claim 2, characterized in that: Each of the recesses is formed into a U-shaped open structure; and along the length direction of the lower plastic part, each of the recesses is open in a direction away from the middle of the lower plastic part.

4. The battery cell casing according to claim 2, characterized in that: The spring pieces are connected to the recesses in a one-to-one correspondence.

5. The battery cell casing according to claim 4, characterized in that: The spring sheet is formed with a matching section, a guiding section and a connecting section which are connected in sequence, so that the spring sheet is formed into an L-shaped structure.

6. The battery cell casing according to claim 5, characterized in that: The matching section is parallel to the inner wall of the main body, the guiding section and the matching section form an angle, and the connecting section is connected to the bottom end of the bottom of the recess.

7. The battery cell casing according to claim 6, characterized in that: Along the width direction of the lower plastic part, the width of the spring sheet is smaller than the width of the recess, and gaps are formed between the two ends of the spring sheet in the width direction and the corresponding inner walls of the recess respectively.

8. The battery cell casing according to claim 2, characterized in that: The assembly portion also includes grooves located at both ends of the lower plastic part in the length direction, and the opening of the groove is located at the top of the lower plastic part; along the length direction of the lower plastic part, the recess is formed on the outer end surface of the groove away from the middle of the lower plastic part.

9. A battery cell, characterized in that: The battery cell comprises the battery cell casing according to any one of claims 1 to 8.

10. A battery cell module, characterized in that: The battery cell module is provided with the battery cell as claimed in claim 9.

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