Battery assembly and battery cell
By installing explosion-proof valves in the projection formed on the side wall of the battery case, the problem of thick walls of the shell is solved, lightweight and efficient manufacturing are achieved, and the overall weight and production cost of the battery cell are reduced.
Patent Information
- Application Number
- CN202422287381.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-19
AI Technical Summary
In the prior art, welding of the explosion-proof valve of the battery cell on the side wall of the housing requires that the shell has sufficient wall thickness, resulting in an increase in the weight of the shell, immature production and manufacturing process, low efficiency and high cost.
A projection is formed on the side wall of the housing, an explosion-proof valve is installed inside, and the explosion-proof area is facing the installation through hole. The thin-wall structure replaces the thick wall, and the explosion-proof valve is installed inside the housing to form a complete exhaust passage.
The weight of the housing is reduced, the maturity and efficiency of the production and manufacturing process is improved, and the cost is reduced. At the same time, the explosion-proof valve does not occupy the internal space of the battery cell, reducing the risk of failure.
Smart Images
Figure CN223124117U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of new energy batteries, and in particular to a battery assembly and a battery cell. Background Art
[0002] With the continuous development of technology, users have higher and higher requirements for new energy batteries. In order to improve the safety performance of battery cells, explosion-proof valves are usually provided on the battery cells. When abnormal operation occurs inside the battery cell and gas is generated, the gas can be discharged through the explosion-proof valve to avoid causing major safety accidents.
[0003] Currently, the explosion-proof valve of the battery cell is provided on the cover plate, and the cover plate also contains a pole column with an electrical connection function. As a safety function, the explosion-proof valve will open during thermal runaway of the battery cell to discharge gas, and there may be phenomena such as electrolyte spraying or spark ignition during spraying. In order to improve the safety of the battery as much as possible, in the prior art, the explosion-proof valve of the battery cell is usually adjusted from the cover plate to the side wall of the housing to achieve the effect of thermal and electrical separation.
[0004] However, currently, welding the explosion-proof valve on the side wall of the housing requires the housing to have a sufficient wall thickness to form a stepped hole for installing the explosion-proof valve. During installation, the edge of the explosion-proof valve is welded to the inner wall of the stepped hole to complete the sealed installation of the explosion-proof valve. However, if the wall thickness of the side of the housing where the explosion-proof valve is welded is greater than that of other surfaces, it will not only increase the weight of the housing, but also the manufacturing process of the housing is immature, with low yield and slow efficiency, and it will also increase the cost. Summary of the Utility Model
[0005] The purpose of the present application is to provide a battery assembly and a battery cell, thereby solving the problem that the housing needs to have a sufficient wall thickness when welding the explosion-proof valve on the side wall of the housing.
[0006] According to a first aspect of the present application, there is provided a battery assembly, the battery assembly including a housing and an explosion-proof valve; the housing includes a side wall, and the explosion-proof valve is disposed on the side wall of the housing; the side wall protrudes outward to form a protruding portion, and the protruding portion forms an installation space inside the housing; the protruding portion is provided with an installation through hole communicating with the installation space; the explosion-proof valve is installed in the installation space, and the detonation area of the explosion-proof valve faces the installation through hole.
[0007] In any of the above technical solutions, further, the housing has a width direction and a thickness direction perpendicular to each other; the housing includes two first side walls opposite to each other in the width direction and two second side walls opposite to each other in the thickness direction; the wall thickness of the first side wall is equal to the wall thickness of the second side wall; the explosion-proof valve is disposed on the first side wall, and the first side wall protrudes outward to form the protruding portion.
[0008] In any of the above technical solutions, further, the explosion-proof valve includes a detonating part, a scoring part, and a supporting part. The supporting part is connected to the detonating part via the scoring part, and both the supporting part and the scoring part are arranged around the detonating part in a circle. The supporting part of the explosion-proof valve is welded to the convex part, and the detonating part of the explosion-proof valve faces the installation through-hole.
[0009] In any of the above technical solutions, further, the convex part forms a weld mark penetrating itself, and the supporting part forms a weld mark with a penetration depth of 0.3 mm.
[0010] In any of the above technical solutions, further, the installation space can completely accommodate the explosion-proof valve.
[0011] In any of the above technical solutions, further, an annular limiting extension is provided on the inner side of the convex part; a positioning extension for cooperating with the limiting extension for positioning is provided on the supporting part of the explosion-proof valve.
[0012] In any of the above technical solutions, further, a counterbore communicating with the installation through-hole is provided on the outer side of the convex part; the battery assembly further includes a protective patch, and the protective patch is installed in the counterbore.
[0013] In any of the above technical solutions, further, the first side wall, the convex part, and the counterbore are integrally formed into a stamping part.
[0014] In any of the above technical solutions, further, the side wall is a side wall made of aluminum, and the wall thickness of the side wall made of aluminum is 0.3 mm to 0.6 mm; or, the side wall is a side wall made of steel, and the wall thickness of the side wall made of steel is 0.1 mm to 0.3 mm.
[0015] According to a second aspect of the present application, a battery cell is provided, including the battery assembly as described above.
[0016] The battery assembly of the present application includes a housing and an explosion-proof valve; wherein, the housing includes a side wall, and the explosion-proof valve is arranged on the side wall of the housing; the side wall protrudes outward to form a convex part, and the convex part forms an installation space inside the housing; the convex part is provided with an installation through-hole communicating with the installation space; the explosion-proof valve is installed in the installation space, and the detonation area of the explosion-proof valve faces the installation through-hole.
[0017] Based on the above technical features, the beneficial effects of the present application are:
[0018] The side wall of the present application bulges outwards to form a convex part, so as to form an installation space inside the housing. The explosion-proof valve is installed in the installation space inside the housing, and the detonation area is directly opposite to the installation through hole, forming a complete exhaust channel. Compared with the prior art, there is no need to set a sufficient wall thickness for installing the explosion-proof valve. The present application uses a thin wall to replace the previous thick wall, and then the entire housing can be set as a thin-wall structure according to requirements. In this way, not only the weight of the housing is reduced, but also the manufacturing process of the housing is mature and the efficiency is high.
[0019] In order 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, the detailed description is as follows. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.
[0021] Figure 1 Schematic diagram of the overall structure of the housing showing the embodiments of the present application;
[0022] Figure 2 Showing Figure 1 Schematic cross-sectional structure diagram of the convex part of the housing;
[0023] Figure 3 Showing Figure 1 Schematic cross-sectional structure diagram of the convex part of the housing after installing the explosion-proof valve;
[0024] Figure 4 Showing Figure 3 Schematic cross-sectional structure diagram of the convex part after setting the limit extension;
[0025] Figure 5 Schematic cross-sectional structure diagram of the explosion-proof valve showing the embodiments of the present application.
[0026] Reference numerals: 100 - First side wall; 101 - Convex part; 1011 - Installation space; 1012 - Installation through hole; 1013 - Counterbore; 1014 - Limit extension; 200 - Second side wall; 300 - Explosion-proof valve; 301 - Detonation part; 302 - Scoring part; 303 - Support part; 3031 - Positioning extension; L1 - Width direction; L2 - Thickness direction. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0027] The following specific embodiments are provided to assist the reader in obtaining a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein, but rather changes that will be apparent after understanding the disclosure of this application may be made, except for operations that must occur in a specific order. Additionally, descriptions of features known in the art may be omitted for increased clarity and conciseness.
[0028] The features described herein may 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, apparatuses, and / or systems described herein that will be apparent after understanding the disclosure of this application.
[0029] 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" another element, "connected to" another element, "coupled to" another element, "above" another element, or "covering" another element, or there can be one or more other elements between them. 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 between them.
[0030] 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.
[0031] 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 may also be referred to as the second component, element, region, layer, or part without departing from the teachings of the examples.
[0032] 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 depicted in the accompanying drawings. 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 accompanying drawings. For example, if the device in the accompanying drawings is flipped, an element described as "above" or "upper" relative to another element will subsequently 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.
[0033] The terms used herein are for the purpose of describing various examples only and are not intended to limit the disclosure. Unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. The terms "comprises", "comprising", and "having" list 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.
[0034] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the accompanying drawings may occur. Thus, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that occur during manufacturing.
[0035] 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. Additionally, although the examples described herein have a variety of configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.
[0036] With the continuous development of technology, users have higher and higher requirements for new energy batteries. In order to maximize the safety of the battery as much as possible, in the prior art, the explosion-proof valve of the battery cell is usually adjusted from the cover plate to the side wall of the housing to achieve the effect of thermoelectric separation. However, currently, welding the explosion-proof valve on the side wall of the housing requires the housing to have a sufficient wall thickness, and the sufficient wall thickness forms a stepped hole for the welding and installation of the explosion-proof valve. However, if the wall thickness of the side of the housing where the explosion-proof valve is welded is greater than that of other surfaces, it will not only cause an increase in the weight of the housing, but also the housing manufacturing process is not mature, with low yield and slow efficiency, and will also result in an increase in cost.
[0037] In view of this, in the first aspect of the present application, a battery assembly is provided, thus solving the problem that currently welding the explosion-proof valve on the side wall of the housing requires the housing to have a sufficient wall thickness.
[0038] The following refers toFigures 1 to 5 Describe the battery assembly according to some embodiments of the present application.
[0039] As Figure 1 and Figure 2 shown, the battery assembly of the present application includes a housing and an explosion-proof valve 300; wherein, the housing includes a side wall, and the explosion-proof valve 300 is disposed on the side wall of the housing; the side wall protrudes outward to form a protruding portion 101, and the protruding portion 101 forms an installation space 1011 inside the housing; the protruding portion is provided with an installation through hole 1012 communicating with the installation space. As Figure 3 shown, the explosion-proof valve 300 is installed in the installation space 1011, and the initiation area of the explosion-proof valve 300 faces the installation through hole 1012.
[0040] The side wall of the present application protrudes outward to form a protruding portion 101 to form an installation space 1011 inside the housing. The explosion-proof valve 300 is installed in the installation space 1011 inside the housing, and the initiation area faces the installation through hole 1012, forming a complete exhaust channel. Compared with the prior art, there is no need to set a sufficient wall thickness for installing the explosion-proof valve. The present application uses a thin wall to replace the previous thick wall, and then the entire housing can be set as a thin-wall structure according to requirements. In this way, not only the weight of the housing is reduced, but also the production and manufacturing process of the housing is mature and the efficiency is high.
[0041] Continue to refer to Figure 1 and Figure 2 , the figure shows the housing structure with equal wall thickness of the present application. Specifically, the housing of the present application has a width direction L1 and a thickness direction L2 that are perpendicular to each other; the housing includes two first side walls 100 that are opposite to each other in the width direction L1 and two second side walls 200 that are opposite to each other in the thickness direction L2; the wall thickness of the first side wall 100 is equal to the wall thickness of the second side wall 200; the explosion-proof valve 300 is disposed on the first side wall 100 (narrow wall), and the installation portion of the explosion-proof valve 300 on the first side wall 100 protrudes outward to form a protruding portion 101. That is, when the housing of the present application is specifically manufactured, all four side walls of the housing can be side walls and have equal wall thickness. In this way, not only the weight of the housing is reduced, but also the production and manufacturing process of the housing is mature and the efficiency is high.
[0042] As an example, the first side wall 100 of the present application can be a side wall made of aluminum material, and the wall thickness of the side wall made of aluminum material is 0.3 mm to 0.6 mm; or, the first side wall 100 is a side wall made of steel material, and the wall thickness of the side wall made of steel material is 0.1 mm to 0.3 mm. In addition, one or more explosion-proof valves can be provided on the two relatively narrow first side walls 100 of the housing as required, and a protruding portion 101 needs to be processed at the position where the explosion-proof valve is provided.
[0043] In the embodiments of the present application, as Figure 5As shown in the figure, the explosion-proof valve includes a detonating part 301, a scoring part 302, and a supporting part 303. The supporting part 303 is connected to the detonating part 301 via the scoring part 302. Both the supporting part 303 and the scoring part 302 are arranged around the detonating part 301 for one week.
[0044] As Figure 3 shown in the figure, the supporting part 303 of the explosion-proof valve 300 is welded to the convex part 101, and the detonating part 301 of the explosion-proof valve 300 faces the installation through hole 1012. For example, the convex part 101 and the supporting part 303 are laser welded, the convex part 101 forms a weld mark penetrating itself, and the supporting part 303 forms a weld mark with a penetration depth of 0.3 mm.
[0045] During installation, the explosion-proof valve 300 positions the explosion-proof valve 300 and the installation through hole 1012 from inside the housing to outside the housing, and then completes fixation and sealing through welding. In addition, after installation, the installation space 1011 can completely accommodate the explosion-proof valve 300, that is, as Figure 3 shown in the figure, the lower surface of the installation space 1011 is lower than the lower surface of the explosion-proof valve 300. In this way, the explosion-proof valve 300 does not occupy the internal space of the electrode group.
[0046] Furthermore, in the embodiment of the present application, in order to facilitate the installation and positioning of the explosion-proof valve 300, as Figure 4 shown in the figure, an annular limiting extension 1014 is provided on the inner side part of the convex part 101, and the explosion-proof valve 300 is provided with a positioning extension 3031 that cooperates with the limiting extension 1014 for positioning. During installation, the explosion-proof valve 300 positions the explosion-proof valve 300, the limiting extension 1014, and the installation through hole 1012 from inside the housing to outside the housing. After positioning, the explosion-proof valve 300 (supporting part 303) and the convex part 101 of the housing are penetrated and welded for fixation and sealing.
[0047] Furthermore, in the embodiment of the present application, as Figure 3 and Figure 4 shown in the figure, a counterbore 1013 communicating with the installation through hole 1012 is provided on the outer side part of the convex part 101; the battery assembly further includes a protective patch (such as an explosion-proof valve patch), and the protective patch is installed in the counterbore 1013. Specifically, a step can be formed on the convex part 101 by processing and thinning for adhesively fixing the explosion-proof valve patch. In this way, the explosion-proof valve patch is used to protect the explosion-proof valve 300 and prevent scratching.
[0048] In summary, aiming at the deficiencies of the prior art, the battery assembly of the present application has the following advantages:
[0049] The side wall of the present application bulges outwards to form a convex portion 101, so as to form an installation space 1011 inside the housing. The explosion-proof valve 300 is installed in the installation space 1011 inside the housing, and the detonation area is facing the installation through-hole 1012 to form a complete exhaust passage. Compared with the prior art, there is no need to set a sufficient wall thickness for installing the explosion-proof valve. The present application uses a thin wall to replace the previous thick wall, and thus the entire housing can be set as a thin-wall structure according to requirements. In this way, not only the weight of the housing is reduced, but also the manufacturing process of the housing is mature and the efficiency is high.
[0050] In addition, the explosion-proof valve 300 does not occupy the internal space of the battery cell.
[0051] In addition, the explosion-proof valve 300 does not protrude from the outer wall of the housing, reducing the risk of explosion-proof valve failure.
[0052] In addition, the first side wall 100 on the narrow side of the present application forms a convex portion 101 outwards through a stamping process, and then forms a counterbore 1013 by stamping inwards, that is, the first side wall 100, the convex portion 101 and the counterbore 1013 are integrally formed into a stamping part. In this way, the processing is convenient and the structural strength is good.
[0053] According to a second aspect of the present application, a battery cell is provided, including the battery assembly as described above.
[0054] Finally, it should be noted that: the above-mentioned 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 art within the technical scope disclosed by 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 by the protection scope of the present application.
Claims
1. A battery assembly, characterized in that, The battery assembly includes a housing and an explosion-proof valve; The housing includes side walls, and the explosion-proof valve is disposed on the side walls of the housing; The side walls bulge outwards to form a protruding portion, and the protruding portion forms an installation space inside the housing; The protruding portion is provided with an installation through hole communicating with the installation space; The explosion-proof valve is installed in the installation space, and the detonation area of the explosion-proof valve faces the installation through hole.
2. The battery assembly according to claim 1, characterized in that, The housing has a width direction and a thickness direction perpendicular to each other; The housing includes two first side walls opposite to each other in the width direction and two second side walls opposite to each other in the thickness direction; The wall thickness of the first side wall is equal to the wall thickness of the second side wall; The explosion-proof valve is disposed on the first side wall, and the first side wall bulges outwards to form the protruding portion.
3. The battery assembly according to claim 2, wherein, The explosion-proof valve includes a detonation portion, a scoring portion and a support portion. The support portion is connected to the detonation portion via the scoring portion, and both the support portion and the scoring portion are arranged around the detonation portion for one week; The support portion of the explosion-proof valve is welded to the protruding portion, and the detonation portion of the explosion-proof valve faces the installation through hole.
4. The battery assembly according to claim 3, wherein, The protruding portion forms a weld mark penetrating itself, and the support portion forms a weld mark with a penetration depth of 0.3 mm.
5. The battery assembly according to claim 3, wherein, The installation space can completely accommodate the explosion-proof valve.
6. The battery assembly according to claim 5, characterized in that, An annular limiting extension is provided on the inner side portion of the protruding portion; The support portion of the explosion-proof valve is provided with a positioning extension for cooperating with the limiting extension for positioning.
7. The battery assembly according to claim 2, wherein, A counterbore communicating with the installation through hole is provided on the outer side portion of the protruding portion; The battery assembly further includes a protective patch, and the protective patch is installed on the counterbore.
8. The battery assembly according to claim 7, characterized in that, The first side wall, the protruding portion and the counterbore are integrally formed as a stamping part.
9. The battery assembly according to any one of claims 1-8, characterized in that, The side wall is a side wall made of aluminum material, and the wall thickness of the side wall made of aluminum material is 0.3 mm to 0.6 mm; Or, the side wall is a side wall made of steel material, and the wall thickness of the side wall made of steel material is 0.1 mm to 0.3 mm.
10. A battery cell, characterized in that, Including the battery assembly according to any one of claims 1-9.