Battery cell shell, battery cell and battery cell module
By designing a protruding positioning part in the plate assembly of the battery cell shell and abutting with the inner wall of the main shell, the precise positioning of the plate assembly and the main shell is achieved, and the problem of difficult to control the gap between the welding surface is solved, ensuring welding quality and battery cell performance.
Patent Information
- Application Number
- CN202421553080.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-07-02
AI Technical Summary
In the prior art, when the cover assembly of the square battery cell is welded to the shell, the gap between the welding surface cannot be effectively controlled, resulting in possible defects such as blasting points and pinholes, or increasing assembly difficulty, affecting the performance of the battery cell.
A battery cell shell is designed, in which the two end faces in the length direction of the lower plastic part of the plate body assembly form protruding positioning parts. When the plate body assembly is assembled with the main shell, the positioning part is in contact with the inner wall of the main shell, realizing the precise positioning of the plate body assembly and the main shell, thereby adjusting the position of the welding surface and accurately controlling the size of the gap between the welding surface.
By accurately positioning and adjusting the gap between the welding surface, we ensure welding quality, avoid the occurrence of bad phenomena, and at the same time reduce assembly difficulty and improve battery cell performance.
Smart Images
Figure CN222953214U_ABST
Abstract
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. Before the two are welded, they need to be assembled by equipment. However, the gap between the welding surfaces of the two cannot be guaranteed when assembled by equipment. When the gap between the welding surfaces 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 is difficult to adjust when they are assembled.
[0004] According to the above purpose, the utility model provides a battery cell shell, wherein the battery cell shell comprises:
[0005] Main shell;
[0006] A plate assembly is located at the end of the main shell; the plate assembly includes a lower plastic part, and both end faces of the lower plastic part in the length direction are formed with protruding positioning parts; along the height direction of the lower plastic part, both ends of the positioning part are connected to the lower plastic part; when the plate assembly is assembled with the main shell, the positioning part abuts against the inner wall of the main shell accordingly.
[0007] Preferably, grooves are formed at both ends of the lower plastic part in the length direction, and the openings of the grooves are located at the top of the lower plastic part;
[0008] Along the length direction of the lower plastic part, the positioning parts are formed on the outer end surfaces of the two grooves which are away from each other.
[0009] Preferably, a plurality of positioning portions are formed on the end surface of each of the grooves, and the positioning portions are arranged at intervals along the width direction of the lower plastic part.
[0010] Preferably, each of the grooves is formed with a plurality of hollow structures, and the hollow structures penetrate the outer end surface and the bottom surface of the corresponding groove; and each of the positioning parts is respectively arranged at the hollow structures.
[0011] Preferably, the positioning portion includes a first connecting end and a second connecting end connected in sequence, the first connecting end is connected to the outer end surface of the groove, and the second connecting end is connected to the bottom of the groove.
[0012] Preferably, the first connecting end is formed into a U- or C-shaped structure, and along the width direction of the lower plastic part, the two ends of the first connecting end in the extension direction are respectively connected to the edges of the hollow structure, so that the first connecting end is open toward the groove and protrudes from the outer end surface of the groove.
[0013] Preferably, the second connecting end is formed with a straight segment, an inclined segment and a wavy segment connected in sequence, the end of the straight segment away from the inclined segment is connected to the bottom surface of the first connecting end, and the end of the wavy segment away from the inclined segment is connected to the hollow structure;
[0014] When the plate assembly is assembled with the main shell, the first connecting end abuts against the straight line segment and the corresponding inner wall of the main shell.
[0015] Preferably, along the width direction of the lower plastic part, gaps are formed between both ends of the wave segment and the inner wall of the hollow structure.
[0016] 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.
[0017] 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.
[0018] According to the battery cell shell, battery cell and battery cell module of the utility model, both end faces of the lower plastic part in the length direction of the plate body assembly are formed with protruding positioning parts, and along the height direction of the lower plastic part, both ends of the positioning part are connected to the lower plastic part. In this way, when the plate body assembly is assembled with the main shell, the positioning part can be correspondingly abutted with the inner wall of the main shell, thereby realizing precise positioning of the plate body assembly and the main shell, and further, as long as the position of the welding surface of the plate body assembly is adjusted based on the positioning part, the size of the gap between the welding surface of the plate body assembly and the main shell can be accurately adjusted to ensure the welding quality.
[0019] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] 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.
[0021] Figure 1 is a partial cross-sectional view of a battery cell housing according to an embodiment of the utility model;
[0022] Figure 2 is a schematic diagram of a lower plastic part according to an embodiment of the utility model;
[0023] Figure 3 This is an enlarged schematic diagram of the lower plastic part A according to an embodiment of the utility model.
[0024] Figure 4 It is a partial cross-sectional view of the lower plastic part according to an embodiment of the utility model.
[0025] Icon: 1-main shell; 2-lower plastic part; 21-groove; 22-hollow part; 221-gap; 23-positioning part; 231-first connecting end; 232-second connecting end; 2321-straight section; 2322-inclined section; 2323-wavy section. DETAILED DESCRIPTION
[0026] 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.
[0027] 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.
[0028] 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.
[0029] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.
[0030] 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.
[0031] 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.
[0032] 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.
[0033] 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.
[0034] The features of the examples described herein may 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 the utility model, a battery cell shell is provided, such as Figures 1 to 4 As shown, the battery cell housing in this embodiment includes a main housing 1 and a plate assembly, and the plate assembly is assembled correspondingly with the end of the main housing 1 and fixed by welding. The plate assembly includes a lower plastic part 2, and both end faces of the lower plastic part 2 in the length direction are formed with protruding positioning parts 23. When the plate assembly is assembled with the main housing 1, the positioning parts 23 can be correspondingly abutted with the inner wall of the main housing 1, thereby achieving accurate positioning of the plate assembly and the main housing 1. Further, as long as the position of the welding surface of the plate assembly is adjusted based on the positioning parts 23, the gap size between the welding surface of the plate assembly and the main housing 1 can be accurately adjusted to ensure the welding quality. 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.
[0036] In this embodiment, if Figure 2 As shown, grooves 21 protruding from the bottom of the lower plastic part 2 are formed at both ends of the length direction of the lower plastic part 2, and the opening of the groove 21 is located at the top of the lower plastic part 2. The lower plastic part 2 can be abutted against the pole group through the groove 21 to improve the stability of the overall structure of the battery cell. Along the length direction of the lower plastic part 2, the outer end faces of the two grooves 21 away from each other are formed with the positioning parts 23. Furthermore, a plurality of positioning parts 23 are formed on the end face of each groove 21, and the plurality of positioning parts 23 are arranged at intervals along the width direction of the lower plastic part 2.
[0037] It should be noted that the positioning parts 23 and the grooves 21 in this embodiment are symmetrically arranged to ensure the stability of the structure of the lower plastic part 2 and to improve the smoothness of the assembly of the plate assembly and the main shell 1. There are no specific restrictions on the specifications of the grooves 21, the number and position of the positioning parts 23 (in this embodiment, two positioning parts 23 are respectively provided on the outer end surface of each groove 21), as long as the above technical effects can be achieved.
[0038] Furthermore, if Figure 3 to Figure 4 As shown, each groove 21 is formed with a plurality of hollow structures 22 (two in this embodiment), each hollow structure 22 penetrates the outer end surface and the bottom surface of the corresponding groove 21, that is, the hollow structure 22 is formed into an L-shaped structure, and each positioning portion 23 is arranged at the hollow structure 22 in a one-to-one correspondence. Specifically, each positioning portion 23 includes a first connecting end 231 and a second connecting end 232 connected in sequence, the first connecting end 231 is connected to the outer end surface of the groove 21, and the second connecting end 232 is connected to the bottom of the groove 21.
[0039] More specifically, if Figure 3As shown, the first connection end 231 is formed into a U-shaped structure (it can also be formed into a C-shaped structure). Along the width direction of the lower plastic part 2, the two ends of the first connection end 231 in the extension direction are respectively connected to the edges of the hollow structure 22, so that the first connection end 231 is open to the groove 21 and protrudes from the outer end surface of the groove 21. The arrangement of the first connection end 231 can effectively improve the strength of the overall structure of the positioning part 23. Figure 4 As shown, the second connecting end 232 is formed with a straight segment 2321, an inclined segment 2322 and a wavy segment 2323 connected in sequence, the end of the straight segment 2321 away from the inclined segment 2322 is connected to the bottom surface of the first connecting end 231, and the end of the wavy segment 2323 away from the inclined segment 2322 is connected to the hollow structure 22.
[0040] In this way, the inclined section 2322 can facilitate the improvement of the smoothness of the assembly of the plate body assembly and the main shell 1, so as to avoid the situation where the plate body assembly cannot be assembled due to the deviation caused by the precision of the equipment (the equipment refers to the equipment used to assemble the plate body assembly and the main shell 1 accordingly); and when the plate body assembly and the main shell 1 are assembled, the straight section 2321 and the end face of the first connecting end 231 away from the groove 21 can be correspondingly abutted against the inner wall of the main shell 1, thereby realizing the precise positioning of the plate body assembly and the main shell 1, and then, as long as the position of the welding surface of the plate body assembly is adjusted based on the positioning portion 23, the size of the gap between the welding surface of the plate body assembly and the main shell 1 can be accurately adjusted.
[0041] In addition, along the width direction of the lower plastic part 2, gaps 221 are formed between the two ends of the wave section 2323 and the inner wall of the hollow structure 22. Under the cooperation of the gap 221 and the wave section 2323 structure, and combined with its plastic material, the positioning portion 23 has a certain elasticity, which is more conducive to the smooth assembly of the plate assembly.
[0042] According to the battery cell shell of the present invention, both end faces of the lower plastic part 2 in the length direction of the plate body assembly are formed with protruding positioning parts 23, and along the height direction of the lower plastic part 2, both ends of the positioning parts 23 are connected to the lower plastic part 2, so that when the plate body assembly is assembled with the main shell 1, the positioning parts 23 can be correspondingly abutted with the inner wall of the main shell 1, thereby realizing the precise positioning of the plate body assembly and the main shell 1, and then, as long as the position of the welding surface of the plate body assembly is adjusted based on the positioning parts 23, the size of the gap between the welding surface of the plate body assembly and the main shell 1 can be accurately adjusted to ensure the welding 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 shell; A plate assembly is located at the end of the main shell; the plate assembly includes a lower plastic part, and both end faces of the lower plastic part in the length direction are formed with protruding positioning parts; along the height direction of the lower plastic part, both ends of the positioning part are connected to the lower plastic part; when the plate assembly is assembled with the main shell, the positioning part abuts against the inner wall of the main shell accordingly.
2. The battery cell casing according to claim 1, characterized in that: Grooves are formed at both ends of the lower plastic part in the length direction, and 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 positioning parts are formed on the outer end surfaces of the two grooves which are away from each other.
3. The battery cell casing according to claim 2, characterized in that: A plurality of positioning portions are formed on the end surface of each groove, and the positioning portions are arranged at intervals along the width direction of the lower plastic part.
4. The battery cell casing according to claim 3, characterized in that: Each of the grooves is formed with a plurality of hollow structures, and the hollow structures penetrate the outer end surface and the bottom surface of the corresponding groove; and each of the positioning parts is respectively arranged at the hollow structures.
5. The battery cell casing according to claim 4, characterized in that: The positioning portion includes a first connection end and a second connection end connected in sequence, the first connection end is connected to the outer end surface of the groove, and the second connection end is connected to the bottom of the groove.
6. The battery cell casing according to claim 5, characterized in that: The first connecting end is formed into a U- or C-shaped structure, and along the width direction of the lower plastic part, the two ends of the first connecting end in the extension direction are respectively connected to the edges of the hollow structure, so that the first connecting end is open toward the groove and protrudes from the outer end surface of the groove.
7. The battery cell casing according to claim 6, characterized in that: The second connecting end is formed with a straight segment, an inclined segment and a wavy segment connected in sequence, the end of the straight segment away from the inclined segment is connected to the bottom surface of the first connecting end, and the end of the wavy segment away from the inclined segment is connected to the hollow structure; When the plate assembly is assembled with the main shell, the first connecting end abuts against the straight line segment and the corresponding inner wall of the main shell.
8. The battery cell casing according to claim 7, characterized in that: Along the width direction of the lower plastic part, gaps are formed between both ends of the wave segment and the inner wall of the hollow structure.
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.