Single battery, battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, and discloses a single battery, a battery pack and electric equipment, the single battery comprises a shell and a cover plate piece; the shell is provided with an accommodating cavity and an opening communicated with the accommodating cavity; the shell comprises side walls, and the side walls comprise a first side wall and a second side wall; the shell further comprises a matching groove part, and the matching groove part is formed in the first side wall or the second side wall. The cover plate piece comprises a main body part and a matching part, the main body part is connected to the side wall and covers the opening, and the matching part is connected to the main body part and is limited in the matching groove part; according to the single battery provided by the utility model, the matching part can be limited through the matching groove part, so that the assembly between the shell and the cover plate piece is facilitated, a positioning function can be provided in the welding process between the shell and the cover plate piece, the welding performance between the shell and the cover plate piece is improved, and the risk of welding failure is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a single cell and a battery pack. Background Art

[0002] The main structural parts of the battery include a shell and a cover plate, which are sealed and connected after being matched together. Currently, in most cases, the cover plate and the shell are sealed by welding methods such as laser welding. Before welding the cover plate to the shell, the cover plate needs to be placed in the opening of the shell. The cover plate can easily fall into the interior of the shell through the opening of the shell, which is not convenient for assembly between the cover plate and the shell. Utility Model Content

[0003] Aiming to solve at least one of the technical problems existing in the prior art, the utility model provides a single cell, a battery pack including the single cell, and an electrical device including the battery pack.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a single cell battery, which has a first direction, and the single cell battery includes a shell and a cover plate; the shell is provided with a accommodating cavity, and one end of the shell along the first direction is open to form an opening connected to the accommodating cavity; the shell includes a side wall parallel to the first direction, and the side wall includes two first side walls arranged opposite to each other and two second side walls arranged opposite to each other; the first side wall and the second side wall are alternately arranged, and the area of ​​the first side wall is larger than the area of ​​the second side wall, and the shell also includes a matching groove portion, and the matching groove portion is opened on the side of the first side wall facing the accommodating cavity or the side of the second side wall facing the accommodating cavity; the cover plate includes a main body and a matching portion, the matching portion is connected to the main body, the main body is welded to the side wall and covers the opening, and the matching portion is limited to the matching groove portion.

[0005] In some embodiments, the mating groove portion is opened on the side of the first side wall facing the accommodating cavity, the single battery has a second direction, the first direction intersects with the second direction, the first side wall is parallel to the second direction, and along the second direction, the size of the first side wall is a mm, and the size of the mating groove portion is b mm, satisfying: 0.1≤b / a≤1.

[0006] In some embodiments, 0.1≤b / a<0.25.

[0007] In some embodiments, the mating groove portion is opened on the side of the second side wall facing the accommodating cavity, the single battery has a third direction, the first direction intersects with the third direction, the second side wall is parallel to the third direction, and along the third direction, the size of the second side wall is g mm, and the size of the mating groove portion is b mm, satisfying: 0.1≤b / g≤1.

[0008] In some embodiments, 0.1 ≤ b / g < 0.25.

[0009] In some embodiments, the thickness of the cover plate is d mm, and the maximum wall thickness of the second side wall is e mm, satisfying: e<d.

[0010] In some embodiments, the mating groove has a first mating wall facing the opening; the mating portion has a second mating wall, and the second mating wall is attached to the first mating wall.

[0011] In some embodiments, the side wall further includes a transition portion, and the adjacent first side wall and the second side wall are connected by the transition portion, and the transition portion is a rounded transition or a chamfered transition.

[0012] The utility model also provides a battery pack, which includes any of the above-mentioned single cells.

[0013] The utility model also provides an electrical device, wherein the electrical device comprises the battery pack described in any one of the above items.

[0014] Compared with the prior art, the advantageous effects of a single cell battery in an embodiment of the utility model are as follows: (1) by opening a matching groove on the side wall and arranging a matching portion on the cover plate to limit the matching groove, when the cover plate is assembled to the opening of the shell, the matching groove can limit the matching portion to prevent the cover plate from falling along the opening into the interior of the shell, thereby facilitating the assembly between the shell and the cover plate; and the matching groove can also provide a positioning effect during the welding process between the shell and the cover plate, thereby improving the welding performance between the shell and the cover plate and reducing the risk of welding failure.

[0015] (2) A matching groove is provided on the first side wall or on the second side wall, which is different from the conventional method of providing a top cover limiter with an inwardly protruding side wall. This can reduce stress concentration at the weld between the shell and the cover plate, and reduce the risk of cracking and failure at the weld between the cover plate and the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of a single cell provided in the first embodiment of the utility model;

[0017] Figure 2 This is an exploded diagram of a single cell provided in the first embodiment of the utility model;

[0018] Figure 3 yes Figure 2 A magnified schematic diagram of point A;

[0019] Figure 4 yes Figure 2 An enlarged schematic diagram of point B;

[0020] Figure 5 It is a top view of the housing provided in the first embodiment of the utility model;

[0021] Figure 6 It is a top view of the cover plate member provided in the first embodiment of the utility model;

[0022] Figure 7 This is a first side cross-sectional view of a single cell provided in the first embodiment of the utility model;

[0023] Figure 8 This is a second side cross-sectional view of a single cell provided in the first embodiment of the utility model.

[0024] Fig. 9 This is an exploded diagram of a single cell provided in the second embodiment of the present utility model;

[0025] Fig.10 yes Fig. 9 An enlarged schematic diagram of point C;

[0026] Fig.11 yes Fig. 9 An enlarged schematic diagram of point D;

[0027] Fig.12 It is a top view of the shell provided in the second embodiment of the present utility model.

[0028] In the figure, 1, housing; 10, accommodating cavity; 11, side wall; 111, first side wall; 112, second side wall; 113, transition part; 100, opening; 12, matching groove; 13, bottom plate; 121, first matching wall;

[0029] 2. Cover plate; 21. Main body; 22. Matching part; 211. Explosion-proof valve mounting hole; 212. Liquid injection hole; 213. Through hole; 221. Second matching wall;

[0030] 3. Pole;

[0031] Z, first direction; X, second direction; Y, third direction. DETAILED DESCRIPTION

[0032] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0038] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0039] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0040] Embodiment 1

[0041] See also Figure 1-Figure 8 , Embodiment 1 of the present invention provides a single cell battery, the single cell battery has a first direction Z, the single cell battery comprises a shell 1, a cover plate member 2 and a battery cell (not shown); the shell 1 is provided with a accommodating cavity 10, one end of the shell 1 along the first direction Z is open to form an opening 100 connected to the accommodating cavity 10, the shell 1 comprises a side wall 11 parallel to the first direction Z, the side wall 11 comprises two first side walls 111 arranged oppositely and two second side walls 112 arranged oppositely; the shell 1 also comprises a matching groove portion 12, the matching groove portion 12 is arranged on a side of the first side wall 111 facing the accommodating cavity 10, and the matching groove portion 12 is connected to the opening 100 of the accommodating cavity 10; the cover plate member 2 comprises a main body portion 21 and a matching portion 22, the main body portion 21 is connected to the side wall 11 and covers the opening 100, the matching portion 22 is connected to the main body portion 21 and is limited to the matching groove portion 12; the battery cell is arranged in the accommodating cavity 10.

[0042] Based on this technical solution, by opening the matching groove portion 12 on the first side wall 111 and providing a matching portion 22 on the cover member that is limited by the matching groove portion 12, when the cover member 2 is assembled to the opening 100 of the shell 1, the matching groove portion 12 can limit the matching portion 22 to prevent the cover member 2 from falling into the interior of the shell 1 along the opening 100, thereby facilitating the assembly between the shell 1 and the cover member 2; at the same time, the matching groove portion 12 and the matching portion 22 can also provide a positioning effect during the welding process between the shell 1 and the cover member 2, thereby improving the welding performance between the shell 1 and the cover member 2 and reducing the risk of welding failure; compared with the traditional method of convexing the entire battery shell side wall inward to form a top cover limiter, the present application can reduce welding stress while positioning the top cover and improve welding performance.

[0043] It is understandable that the matching groove 12 can be opened on the side of the first side wall 111 facing the accommodating cavity 10 by any processing method such as thinning and cutting.

[0044] In this embodiment, the shell 1 is made of aluminum alloy.

[0045] In some other embodiments, the material of the shell 1 may also be a single metal such as aluminum, copper, or any metal alloy material such as a copper alloy, which is not limited here.

[0046] The inner wall surface of the housing 1 may be coated with an anti-corrosion coating to form an anti-corrosion coating, which can prevent the electrolyte from corroding the housing 1. The cover plate 2 and the housing 1 are connected and fixed by welding, and the welding may be arc welding, laser welding, ultrasonic welding, etc. In order to ensure the welding quality, the material of the cover plate 2 is preferably the same as that of the housing 1.

[0047] It can be understood that the housing 1 can be an integrally formed part, or a plurality of side walls 111 are separately manufactured and then connected.

[0048] See also Figure 2-Figure 3 The side wall 11 further includes a transition portion 113 , and the adjacent first side wall 111 and the second side wall 112 are connected via the transition portion 113 .

[0049] Optionally, the transition portion 113 is a rounded transition portion or a chamfered transition portion. The use of the rounded transition portion 113 or the chamfered transition portion can not only reduce stress concentration and improve the strength of the shell 1, but also facilitate the operation of inserting the cover plate 2 into the shell, and facilitate the assembly of the shell 1 and the cover plate 2.

[0050] See also Figure 2-Figure 5The matching groove 12 has a first matching wall 121 facing the opening 100; the matching portion 22 has a second matching wall 221, and the second matching wall 221 is attached to the first matching wall 121. The first matching wall 121 and the second matching wall 221 are adopted, so that the matching groove 12 can support and limit the matching portion 22, thereby preventing the cover plate 2 from falling into the inside of the shell 1 along the opening, facilitating the assembly between the shell 1 and the cover plate 2. The first matching wall 121 and the second matching wall 221 are attached, which can ensure that the cover plate is firmly and reliably limited, ensure that the cover plate and the shell remain relatively stable and flat during welding, reduce welding stress, and improve welding quality.

[0051] In this embodiment, the first side wall 111 and the second side wall 112 are alternately arranged, and the inner wall area of ​​the first side wall 111 is larger than the inner wall area of ​​the second side wall 112. The first side wall 111 is the large side of the housing 1, and the second side wall 112 is the small side of the housing 1.

[0052] The housing 1 further includes a bottom plate 13, and the first side wall 111, the second side wall 112 and the transition portion 113 are all connected to the bottom plate 13. The bottom plate 13, the first side wall 111, the second side wall 112, the transition portion 113 and the cover plate member 2 enclose a sealed accommodating cavity 10. Preferably, the housing 1 is formed by stamping, so that the first side wall 111, the second side wall 112, the transition portion 113 and the bottom plate 13 are an integrated structure, and the thickness of the connection between the first side wall 111, the second side wall 112, the transition portion 113 and the bottom plate 13 does not need to meet the design requirements of welding.

[0053] The single battery cell also has a second direction X and a third direction Y, and the second direction X, the third direction Y and the first direction Z intersect in pairs.

[0054] In this embodiment, the first direction Z is the height direction of the single cell, the second direction X is the length direction of the single cell, the third direction Y is the width direction of the single cell, and the first direction Z, the second direction X and the third direction Y are perpendicular to each other.

[0055] See also Figure 5 , Figure 7 and Figure 8 Along the second direction X, the size of the first side wall 111 is amm, and the size of the matching groove 12 is bmm, satisfying: 0.1≤b / a≤1, that is, 0.1a≤b≤a.

[0056] Optionally, b / a can be 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, or any other value satisfying 0.1≤b / a≤1, and is not limited here.

[0057] Preferably, 0.1≤b / a<0.25, that is, 0.1a≤b<0.25a.

[0058] On the basis of keeping other conditions unchanged, different values ​​of b / a in the example are used for testing, and the residual stress determination method in GB / T24179-2023 is used to test the stress at the weld between the cover plate 2 and the shell 1. The test results are shown in Table 1 below:

[0059]

[0060] Table 1

[0061] It can be seen from Examples 1-6 in Table 1 that when b / a is less than 0.05, the size of the matching groove is too small, resulting in poor stability when the cover plate and the shell are fixed, and it is difficult to ensure flatness during welding, resulting in large welding stress. However, when 0.1≤b / a≤1, the stability between the cover plate and the shell can be well guaranteed, the welding quality is good, and the welding stress is reduced.

[0062] Furthermore, when 0.1≤b / a<0.25, the welding stress is smaller and the welding quality between the top cover and the shell is better.

[0063] In this embodiment, the maximum wall thickness of the second side wall 112 is e, the maximum wall thickness of the first side wall 111 is f, e=f, ​​and the first side wall 111 is set with a uniform wall thickness, and the second side wall 112 is set with a uniform wall thickness. By making the thickness of the first side wall 111 equal to that of the second side wall 112 and adopting a uniform wall thickness, the convenience of processing the shell 1 can be improved.

[0064] In some embodiments, the thickness of the cover plate 2 is d mm, and the maximum wall thickness of the second side wall 112 is e mm, satisfying: e<d. The setting of e<d can ensure that the connection between the cover plate 2 and the housing 1 has a sufficient cross-sectional area to strengthen the connection strength between the two and reduce the risk of cracking failure at the weld.

[0065] In this embodiment, the main body 21 is provided with an explosion-proof valve installation hole 211 for installing the explosion-proof valve. The main body 21 is provided with a liquid injection hole 212 extending along the main body 21. The main body 21 is provided with a through hole 213 extending along the first direction Z. The pole 3 is installed in the through hole 213 and connected to the battery cell in the housing 1 through the through hole 213.

[0066] Embodiment 2

[0067] See also Figure 9-12 Different from the first embodiment, the matching groove 12 of the single battery provided in the second embodiment of the present invention is opened on the side of the second side wall 112 facing the accommodating cavity 10.

[0068] The single cell provided in the second embodiment of the utility model can reduce the area of ​​the shell 1 that needs to be recessed to form the matching groove 12 by only opening the matching groove 12 on the inner wall surface of the second side wall 112, thereby reducing the area of ​​the shell 1 that is deformed during processing, reducing the stress concentration at the weld between the shell 1 and the cover plate 2, and reducing the risk of cracking and failure at the weld.

[0069] The first direction Z intersects the third direction Y. Along the third direction Y, the dimension of the second side wall 112 is g, and the dimension of the matching groove 12 is b, which satisfies: 0.1≤b / g≤1, that is, 0.1g≤b≤g.

[0070] In this embodiment, the first direction Z and the third direction Y are perpendicular to each other, and the first direction Z is the height direction of the single battery, and the third direction Y is the width direction of the single battery.

[0071] Optionally, b / g can be 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, or any other value satisfying 0.1≤b / g≤1, and is not limited here.

[0072] Preferably, 0.1≤b / g<0.25, that is, 0.1g≤b<0.25g.

[0073] On the basis of keeping other conditions unchanged, different values ​​of b / g in the example are used for testing, and the residual stress determination method in GB / T24179-2023 is used to test the stress at the weld between the cover plate 2 and the shell 1. The test results are shown in Table 2 below:

[0074]

[0075] Table 2

[0076] It can be seen from Examples 7-12 in Table 2 that when b / a is less than 0.05, the size of the matching groove is too small, resulting in poor stability when the cover plate and the shell are fixed, and it is difficult to ensure flatness during welding, resulting in large welding stress. However, when 0.1≤b / a≤1, the stability between the cover plate and the shell can be well guaranteed, the welding quality is good, and the welding stress is reduced.

[0077] Furthermore, when 0.1≤b / a<0.25, the welding stress is smaller and the welding quality between the top cover and the shell is better.

[0078] The utility model also provides a battery pack, which includes any one of the above-mentioned single cells.

[0079] The utility model also provides an electrical device, which comprises any one of the above-mentioned battery packs.

[0080] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A single cell battery, the single cell battery having a first direction (Z), characterized in that: include: A housing (1), the housing (1) being provided with a receiving cavity (10), and one end of the housing (1) along the first direction (Z) being open to form an opening (100) communicating with the receiving cavity (10); The housing (1) comprises a side wall (11) parallel to the first direction (Z), the side wall comprising two first side walls (111) arranged opposite to each other and two second side walls (112) arranged opposite to each other, the first side walls (111) and the second side walls (112) being arranged alternately, and the area of ​​the first side wall (111) being greater than the area of ​​the second side wall (112); The housing (1) further comprises a matching groove portion (12), wherein the matching groove portion (12) is provided on a side of the first side wall (111) facing the accommodating cavity (10) or on a side of the second side wall (112) facing the accommodating cavity (10); The cover plate member (2) comprises a main body portion (21) and a matching portion (22), wherein the main body portion (21) is welded to the side wall (11) and covers the opening (100), and the matching portion (22) is connected to the main body portion (21) and is limited in the matching groove portion (12).

2. The single cell according to claim 1, characterized in that: The matching groove portion (12) is opened on a side of the first side wall (111) facing the accommodating cavity (10), the single battery has a second direction (X), the first direction (Z) intersects with the second direction (X), the first side wall (111) is parallel to the second direction (X), along the second direction (X), the size of the first side wall (111) is a mm, the size of the matching groove portion (12) is b mm, and the following is satisfied: 0.1≤b / a≤1.

3. The single cell according to claim 2, characterized in that: 0.1≤b / a<0.

25.

4. The single cell according to claim 1, characterized in that: The matching groove portion (12) is opened on a side of the second side wall (112) facing the accommodating cavity (10), the single battery has a third direction (Y), the first direction (Z) intersects with the third direction (Y), the second side wall (112) is parallel to the third direction (Y), along the third direction (Y), the size of the second side wall (112) is g mm, the size of the matching groove portion (12) is b mm, and the following condition is satisfied: 0.1≤b / g≤1.

5. The single cell according to claim 4, characterized in that: 0.1≤b / g<0.25 。 6. The single cell according to claim 1, characterized in that: The thickness of the cover plate (2) is d mm, and the maximum wall thickness of the second side wall (112) is e mm, satisfying: e<d.

7. The single cell according to claim 1, characterized in that: The matching groove portion (12) has a first matching wall (121) facing the opening (100); the matching portion (22) has a second matching wall (221), and the second matching wall (221) is attached to the first matching wall (121).

8. The single cell according to claim 1, characterized in that: The side wall (11) further comprises a transition portion (113), and the adjacent first side wall (111) and the second side wall (112) are connected via the transition portion (113), and the transition portion (113) is a chamfered transition or a beveled transition.

9. A battery pack, characterized in that: A single cell battery comprising any one of claims 1 to 8.

10. An electrical device, characterized in that: A battery pack comprising the battery pack of claim 9.

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