Single battery and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a single battery and a battery pack, the single battery comprises a shell and a cover plate; the shell is provided with a containing cavity with an opening in one end; the shell comprises a side wall and a thickening part, and the thickening part is connected to the side, away from the containing cavity, of the side wall; the thickening part is provided with a first end face close to the opening, the side wall is provided with a second end face close to the opening, and the first end face is connected with the second end face; the cover plate covers the opening and is connected to the second end face; according to the single battery provided by the utility model, the side wall of the opening end of the shell is thickened through the thickening part, so that the stress at the welding seam of the shell and the cover plate can be reduced, and the cracking failure risk at the welding seam is reduced.

Description

Technical Field

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

[0002] The main structural components of a battery include a housing and a cover plate. After the housing and the cover plate are properly fitted, they are hermetically connected. At present, in most cases, the cover plate is welded to the open end of the housing by welding means such as laser welding to achieve the hermetic connection between the housing and the cover plate. However, in the prior art, relatively large stresses are likely to concentrate at the weld seam between the housing and the cover plate, increasing the risk of cracking failure at the weld seam. Summary of the Utility Model

[0003] Aiming to solve at least one of the technical problems existing in the prior art, the utility model provides a single battery and a battery pack including the single battery. The single battery can reduce the stress at the weld seam between the housing and the cover plate and reduce the risk of cracking failure at the weld seam.

[0004] To achieve the above object, the utility model provides a single battery having a first direction, including a housing and a cover plate. The housing is provided with a receiving cavity having an open end. The housing includes a side wall and a thickened portion. The side wall is parallel to the first direction, and the thickened portion is connected to a side of the side wall facing away from the receiving cavity. In the first direction, the thickened portion has a first end face close to the opening, the side wall has a second end face close to the opening, and the first end face and the second end face are connected. The cover plate seals the opening and is connected to the second end face.

[0005] In some embodiments, the thickness of the side wall is a mm, and the thickness of the thickened portion is b mm, satisfying: 0.4 ≤ b / a ≤ 1.

[0006] In some embodiments, the thickness of the side wall is a mm, satisfying: 0.5 ≤ a ≤ 0.7.

[0007] In some embodiments, along the first direction, the size of the side wall is H mm, and the size of the thickened portion is h mm, satisfying: 0.3 ≤ h / H ≤ 1.

[0008] In some embodiments, the side wall includes a plurality of planar walls and a plurality of transition walls. The plurality of planar walls are arranged at intervals, and adjacent two planar walls are connected by the transition walls. The transition walls are provided with rounded corners or chamfers.

[0009] In some embodiments, the plurality of the planar walls include a connected first side surface, a second side surface, a third side surface, and a fourth side surface, the first side surface and the third side surface are parallel and oppositely arranged, and the second side surface and the fourth side surface are parallel and oppositely arranged; wherein, the thickened portion is provided on a side of the first side surface and the third side surface facing away from the accommodation cavity, and / or the thickened portion is provided on a side of the second side surface and the fourth side surface facing away from the accommodation cavity.

[0010] In some embodiments, the thickened portion is connected to a side of the transition wall facing away from the accommodation cavity.

[0011] In some embodiments, the thickened portion has a third end surface away from the opening, and the third end surface has an inclined surface structure or a concave arc surface structure.

[0012] In some embodiments, the first end surface has a planar structure, the second end surface has a planar structure, and the first end surface and the second end surface are flush with each other.

[0013] The present utility model further provides a battery pack, including the single battery according to any one of the above.

[0014] Compared with the prior art, a single battery according to an embodiment of the present utility model has the following beneficial effects: (1), by arranging the thickened portion on a side of the side wall facing away from the accommodation cavity and connecting the first end surface of the thickened portion to the second end surface of the side wall, the side wall of the opening end of the housing can be thickened by the thickened portion, thereby helping to reduce the stress at the weld between the housing and the cover plate and reducing the risk of cracking failure at the weld.

[0015] (2), the size of the internal space of the accommodation cavity for accommodating the battery cell directly determines the energy density of the battery cell. By arranging the thickened portion on a side of the side wall facing away from the accommodation cavity, it is possible to avoid the thickened portion reducing the size of the internal space of the accommodation cavity, thereby avoiding the thickened portion reducing the energy density of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an exploded view of a single battery provided in Embodiment 1 of the present utility model;

[0017] Figure 2 is Figure 1 an enlarged schematic view of part A of

[0018] Figure 3 is a top view of a single battery provided in Embodiment 1 of the present utility model;

[0019] Figure 4 is a side view of a single battery provided in Embodiment 1 of the present utility model;

[0020] Figure 5It is the front view of a single cell provided by the first embodiment of the present utility model;

[0021] Figure 6 It is the cross-sectional view of a single cell provided by the first embodiment of the present utility model;

[0022] Figure 7 It is Figure 6 the enlarged schematic view at position B of

[0023] Figure 8 It is Figure 6 the enlarged schematic view at position C of

[0024] Figure 9 It is the exploded view of a single cell provided by the second embodiment of the present utility model;

[0025] Figure 10 It is Figure 9 the enlarged schematic view at position D of

[0026] Figure 11 It is the front view of a single cell provided by the second embodiment of the present utility model;

[0027] Figure 12 It is the side view of a single cell provided by the second embodiment of the present utility model;

[0028] Figure 13 It is the exploded view of a single cell provided by the third embodiment of the present utility model;

[0029] Figure 14 It is Figure 13 the enlarged schematic view at position E of

[0030] Figure 15 It is the front view of a single cell provided by the third embodiment of the present utility model;

[0031] Figure 16 It is the side view of a single cell provided by the third embodiment of the present utility model.

[0032] In the figure, 1. housing; 10. accommodating cavity; 11. side wall; 12. thickened part; 13. assembly groove part; 14. bottom wall; 110. opening; 111. flat wall; 112. transition wall; 121. first end face; 122. third end face; 131. limiting wall; 1101. second end face; 1111. first side face; 1112. second side face; 1113. third side face; 1114. fourth side face;

[0033] 2. cover plate; 21. pole post mounting hole; 22. explosion-proof valve mounting hole; 23. liquid injection hole;

[0034] 3. pole post;

[0035] Z, the first direction; X, the second direction; Y, the third direction. Detailed implementation manners

[0036] The following will further describe in detail the specific implementation manners of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0037] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0038] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0039] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on the top" of the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under the bottom" of the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used in the description of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the description and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0042] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the description and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0043] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components shown in the drawings of the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device, are only for illustrative purposes and should not constitute any limitation to this application.

[0044] In the description of the embodiments of the present utility model, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0045] As Figure 1-8 shown, a single battery provided in Embodiment 1 of the present utility model has a first direction Z and includes a housing 1 and a cover plate 2; the housing 1 is provided with a receiving cavity 10 having an opening 110 at one end; the housing 1 includes a side wall 11 and a thickening portion 12, the side wall 11 is parallel to the first direction Z, and the thickening portion 12 is connected to the side of the side wall 11 facing away from the receiving cavity 10; in the first direction Z, the thickening portion 12 has a first end face 121 close to the opening 110, and the side wall 11 has a second end face 1101 close to the opening 110, and the first end face 121 and the second end face 1101 are connected; the cover plate 2 seals the opening 110 and is connected to the second end face 1101.

[0046] Based on this technical solution, by arranging the thickened portion 12 on the side of the side wall 11 away from the accommodating cavity 10 and connecting the first end face 121 of the thickened portion 12 to the second end face 1101 of the side wall 11, the side wall 11 of the opening end of the housing 1 can be thickened by the thickened portion 12, which can help reduce the stress at the weld between the housing 1 and the cover plate 2 and reduce the risk of cracking failure at the weld; the size of the internal space of the accommodating cavity 10 for accommodating the battery cell directly determines the energy density of the single battery. By arranging the thickened portion 12 on the side of the side wall 11 away from the accommodating cavity 10, it is also possible to avoid the thickened portion 12 affecting the size of the internal space of the accommodating cavity 10, thereby avoiding the thickened portion 12 affecting the energy density of the battery cell; therefore, the single battery provided by the present utility model can, through the thickened portion 12, not only reduce the stress at the weld between the housing 1 and the cover plate 2 and reduce the risk of cracking failure at the weld, but also avoid affecting the size of the internal space of the accommodating cavity 10 and not reduce the energy density of the single battery.

[0047] The single battery 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 pairwise.

[0048] In this embodiment, the first direction Z is the height direction of the single battery, the second direction X is the length direction of the single battery, the third direction Y is the width direction of the single battery, and the first direction Z, the second direction X and the third direction Y are perpendicular to each other pairwise.

[0049] The single battery also includes a battery cell (not shown), and the battery cell is arranged in the accommodating cavity 10.

[0050] The single battery also includes a terminal post 3. The cover plate 2 is provided with a terminal post mounting hole 21, an explosion-proof valve mounting hole 22 and a liquid injection hole 23. The terminal post 3 is mounted in the terminal post mounting hole 21 and is connected to the battery cell in the housing 1 through the terminal post mounting hole 21.

[0051] In this embodiment, the material of the housing 1 is an aluminum alloy material.

[0052] In some other embodiments, the material of the housing 1 can also be any metal element such as aluminum or copper, or any metal alloy material such as copper alloy, or can also be any organic material such as ceramic or plastic, which is not limited herein.

[0053] The inner wall surface of the housing 1 can be coated with an anti-corrosion coating to form an anti-corrosion layer, and the anti-corrosion layer can prevent the electrolyte from invading the housing 1. The cover plate 2 and the housing 1 are connected and fixed by welding, and the welding can be welding methods such as arc welding, laser welding, ultrasonic welding, etc. Using welding can ensure the connection strength between the cover plate 2 and the housing 1, and ensure the overall strength of the housing 1. To ensure the welding quality, it is preferred that the material of the cover plate 2 is the same as the material of the housing 1.

[0054] It can be understood that the housing 1 can be an integrally formed part, or it can be formed by connecting multiple side walls 11 separately manufactured.

[0055] It should be noted that in the present utility model, for the convenience of understanding, the area on the side wall 11 where the thickening part 12 is provided is called the thickening area, and the area on the side wall 11 where the thickening part 12 is not provided is called the non-thickening area.

[0056] It should be pointed out that the thickening part 12 and the side wall 11 can be integrally processed by means such as casting or stamping, or they can be separately processed later.

[0057] In addition, the number of the thickening parts 12 can be one, two, three...; when the number of the thickening parts 12 is two or more, the shapes and sizes of the thickening parts 12 can be completely the same, partially the same or completely different; when the number of the thickening parts 12 is two or more, the thickening parts 12 can be independently arranged, partially connected or completely connected to each other.

[0058] It should be pointed out that in the present utility model, when the housing 1 has one side wall, one, two or more thickening parts 12 can be provided on the side wall 11; when the housing 1 has two or more side walls 11, the thickening parts 12 can be provided on one side wall 11, or on some side walls 11, or on all side walls 11, and the number of the thickening parts 12 that can be provided on one side wall 11 can be one, two or more.

[0059] Refer to Figure 1 - Figure 4 , the side wall 11 includes a plurality of flat walls 111 and a plurality of transition walls 112. The plurality of flat walls 111 are arranged at intervals, and adjacent two flat walls 111 are connected by the transition walls 112. The transition walls 112 are provided with rounded corners or chamfers. The transition walls 112 provided with rounded corners or chamfers can not only reduce stress concentration and improve the strength of the housing 1, but also facilitate the operation of inserting the cover plate 2 into the housing, and facilitate the assembly of the housing 1 and the cover plate 2.

[0060] The housing 1 further includes an assembly groove portion 13. The assembly groove portion 13 is opened on the inner wall surface of the side wall 11. The assembly groove portion 13 has a limiting wall 131 facing the opening 110 and abutting against the cover plate 2. By using the assembly groove portion 13 and the limiting wall 131, the assembly groove portion 13 can support and limit the cover plate 2, so as to prevent the cover plate 2 from falling into the interior of the accommodation cavity 10 along the opening 110, and facilitate the assembly between the housing 1 and the cover plate 2.

[0061] The housing 1 further includes a bottom wall 14. The planar wall 111 and the transition wall 112 are both connected to the bottom wall 14. The planar wall 111, the transition wall 112 and the bottom wall 14 enclose a sealed cavity. Preferably, the housing 1 is formed by stamping. In this way, the planar wall 111, the transition wall 112 and the bottom wall 14 are of an integral structure, and the thickness at the connection of the planar wall 111, the transition wall 112 and the bottom wall 14 does not need to meet the design requirements for welding.

[0062] The plurality of planar walls 111 include a connected first side surface 1111, a second side surface 1112, a third side surface 1113 and a fourth side surface 1114. The first side surface 1111 and the third side surface 1113 are parallel and opposite to each other, and the second side surface 1112 and the fourth side surface 1114 are parallel and opposite to each other.

[0063] In this embodiment, the inner wall areas of the first side surface 1111 and the third side surface 1113 are larger than the inner wall areas of the second side surface 1112 and the fourth side surface 1114. The first side surface 1111 and the third side surface 1113 are the large surfaces of the housing 1, and the second side surface 1112 and the fourth side surface 1114 are the small surfaces of the housing 1.

[0064] In this embodiment, a thickening portion 12 is provided on the side of the first side surface 1111 and the third side surface 1113 facing away from the accommodating cavity 10, and a thickening portion 12 is provided on the side of the second side surface 1112 and the fourth side surface 1114 facing away from the accommodating cavity 10, and a thickening portion 12 is provided on the side of the transition wall 112 facing away from the accommodating cavity 10. In this way, the thickness of the first side surface 1111, the second side surface 1112, the third side surface 1113, the fourth side surface 1114 and the transition wall 112 can be increased, and the overall strength of the housing 1 can be improved to fully meet the welding processing requirements of the housing 1 and the cover plate 2, avoid poor welding between the cover plate 2 and the housing 1, and improve the welding yield.

[0065] In this embodiment, the assembly groove portion 13 is opened on the inner wall surface of the second side surface 1112, the inner wall surface of the transition wall 112 and the inner wall surface of the fourth side surface 1114; in this way, the cover plate 2 can be limited by the assembly groove portion 13 to prevent the cover plate 2 from falling into the interior of the accommodating cavity 10 along the opening 110, which is convenient for the assembly between the housing 1 and the cover plate 2; because the more concave parts there are on the side wall 11 of the housing 1 near the opening 110, the more areas of the housing 1 will be deformed during processing, and at this time, the stress generated by mechanical processing will be greater. By only opening the assembly groove portion 13 on the inner wall surfaces of the small surfaces of the first side surface 1111 and the third side surface 1113 and the transition wall 112, the area of the housing 1 that needs to be recessed to form the assembly groove portion 13 can be reduced, so that the area of the housing 1 deformed during processing can be reduced, the stress concentration at the weld of the housing 1 and the cover plate 2 can be reduced, and the risk of cracking failure at the weld can be reduced.

[0066] The assembly groove portion 13 can be recessed on the inner wall of the side wall 11 facing the accommodation cavity 10 by any processing method such as thinning or cutting.

[0067] Refer to Figure 5 - Figure 8 , the thickening portion 12 has a third end face 122 away from the opening 110.

[0068] Optionally, the third end face 122 has an inclined surface structure or a concave arc surface structure.

[0069] In some embodiments, the third end face 122 has an inclined surface structure. The high position of the inclined surface structure is connected to the thickening area, and the low position of the inclined surface structure is connected to the non-thickening area. The inclined surface structure is used to make the thickening area smoothly transition to the non-thickening area. The inclined surface structure is simple and convenient for processing, and can effectively reduce the manufacturing cost.

[0070] It should be noted that the third end face 122 with the inclined surface structure can be integrally processed with the housing 1 by means such as casting, or can be processed separately later.

[0071] In some other embodiments, the third end face 122 has a concave arc surface structure, that is, the high position of the concave arc surface structure is the thickening area, and the low position of the concave arc surface structure is connected to the non-thickening area. The concave arc surface structure is used to make the thickening area smoothly transition to the non-thickening area. The surface of the concave arc surface structure is smoother and rounder, and there is no corresponding sharp structure, thereby avoiding interference or scratching of the battery cell assembly during the installation process of the battery cell assembly.

[0072] It should be noted that the third end face 122 with the concave arc surface structure can be integrally processed with the housing 1 by means such as casting and stamping, or can be processed separately later.

[0073] Preferably, the first end face 121 has a flat surface structure, the second end face 1101 has a flat surface structure, and the first end face 121 and the second end face 1101 are flush. In this way, the first end face 121 and the second end face 1101 with flat surface structures and flush with each other are simpler in the design and manufacturing process, reduce the production cost, and improve the production efficiency. The first end face 121 and the second end face 1101 with flat surface structures and flush with each other also make the connection between the open end of the housing 1 and the cover plate 2 simpler. Due to the characteristics of the flat surface, the end face of the housing 1 is not easily deformed when subjected to external forces, thus ensuring the stability and safety of the internal structure of the housing.

[0074] The thickness of the side wall 11 is a mm, and the thickness of the thickening portion 12 is b mm, satisfying: 0.4a ≤ b ≤ a, that is, 0.4 ≤ b / a ≤ 1.

[0075] Optionally, b can be any value such as 0.4a, 0.42a, 0.44a, 0.46a, 0.48a, 0.5a, 0.52a, 0.54a, 0.56a, 0.58a, 0.6a, 0.62a, 0.64a, 0.66a, 0.68a, 0.7a, 0.72a, 0.74a, 0.76, 0.78a, 0.8a, 0.82a, 0.84a, 0.86a, 0.88a, 0.9a, 0.92a, 0.94a, 0.96a, 0.98a, a, etc. that satisfy 0.4a ≤ b ≤ a, and no specific limitation is made here.

[0076] The thickness of the side wall 11 is a mm, satisfying: 0.5 ≤ a ≤ 0.7.

[0077] Optionally, a can be any value such as 0.5, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.7, etc. that satisfy 0.5 ≤ a ≤ 0.7, and no specific limitation is made here.

[0078] It should be noted that in this application, the first side surface 1111, the second side surface 1112, the third side surface 1113, and the fourth side surface 1114 all have a uniform wall thickness, and the wall thicknesses between the first side surface 1111, the second side surface 1112, the third side surface 1113, and the fourth side surface 1114 can be all the same, partially the same, or completely different; the thickened portion 12 also has a uniform wall thickness. As a specific implementation manner, the wall thickness of the first side surface 1111 is the same as that of the third side surface 1113, and the wall thicknesses of the second side surface 1112 and the fourth side surface 1114 are the same to improve the processing convenience.

[0079] Along the first direction Z, the dimension of the side wall 11 is H mm, and the dimension of the thickened portion 12 is h mm, satisfying: 0.3H ≤ h ≤ H, that is, 0.3 ≤ h / H ≤ 1.

[0080] Specifically, in this embodiment,

[0081] Optionally, h can be any value that satisfies 0.3H ≤ h ≤ H, such as 0.3H, 0.32H, 0.34H, 0.36H, 0.38H, 0.4H, 0.42H, 0.44H, 0.46H, 0.48H, 0.5H, 0.52H, 0.54H, 0.56H, 0.58H, 0.6H, 0.62H, 0.64H, 0.66H, 0.68H, 0.7H, 0.72H, 0.74H, 0.76, 0.78H, 0.8H, 0.82H, 0.84H, 0.86H, 0.88H, 0.9H, 0.92H, 0.94H, 0.96H, 0.98H, H, etc., and no further limitations are made here.

[0082] On the basis of keeping other conditions unchanged, tests were carried out with different values of b in the examples, and the stress at the weld between the cover plate 2 and the housing 1 was tested using the residual stress measurement method in GB / T 24179-2023. The test results are shown in Table 1 below:

[0083]

[0084]

[0085] Table 1

[0086] As can be seen from Table 1, when b / a = 0, the stress at the weld reaches 228.872 MPa. When b / a > 0, the stress at the weld decreases. Therefore, by providing a thickened portion 12 on the side wall 11, the stress at the weld between the housing 1 and the cover plate 2 can be reduced. Further, when 0.4 ≤ b / a ≤ 1 is satisfied, the stress at the weld is smaller and the welding quality is better.

[0087] On the basis of keeping other conditions unchanged, tests were carried out with different values of h in the examples, and the stress at the weld between the cover plate 2 and the housing 1 was tested using the residual stress measurement method in GB / T 24179-2023. The test results are shown in Table 2 below:

[0088]

[0089] Table 2

[0090] As can be seen from Table 2, when h / H = 0, the stress at the weld reaches 228.872 MPa. When h / H > 0, the stress at the weld decreases. Therefore, by providing a thickened portion 12 on the side wall 11, the stress at the weld between the housing 1 and the cover plate 2 can be reduced. Further, when 0.3 ≤ h / H ≤ 1 is satisfied, the stress at the weld is smaller and the welding quality is better.

[0091] Example 2

[0092] Refer to Figure 9 - Figure 12 , different from the first embodiment, a thickening portion 12 is provided on the side of the first side surface 1111 and the third side surface 1113 away from the accommodation cavity 10. In this way, the large surface of the housing 1 can be thickened through the thickening portion 12, which helps to reduce the stress at the weld between the housing 1 and the cover plate 2 and reduce the risk of cracking failure at the weld. At the same time, the area on the housing 1 where the thickening portion 12 needs to be provided can be reduced, saving material costs and reducing the weight of the housing 1.

[0093] Embodiment III

[0094] Refer to Figure 13 - Figure 16 , different from the first embodiment, a thickening portion 12 is provided on the side of the second side surface 1112 and the fourth side surface 1114 away from the accommodation cavity 10. In this way, the small surface of the housing 1 can be thickened through the thickening portion 12, which helps to reduce the stress at the weld between the housing 1 and the cover plate 2. At the same time, the area on the housing 1 where the thickening portion 12 needs to be provided can be further reduced, further saving material costs and reducing the weight of the housing 1.

[0095] The present utility model also provides a battery pack, including the single battery of any one of the above.

[0096] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present utility model.

Claims

1. A single battery having a first direction (Z), characterized in that: include: The housing (1) is provided with a receiving chamber (10) with an opening at one end (110); The housing (1) comprises a side wall (11) and a thickened portion (12); the side wall (11) is parallel to the first direction (Z); the thickened portion (12) is connected to a side of the side wall (11) facing away from the accommodating cavity (10); in the first direction (Z), the thickened portion (12) has a first end surface (121) close to the opening (110); the side wall (11) has a second end surface (1101) close to the opening (110); the first end surface (121) and the second end surface (1101) are connected; A cover plate (2) covering the opening (110) and connected to the second end surface (1101); The thickness of the side wall (11) is a mm, and the thickness of the thickened portion (12) is b mm, satisfying: 0.4≤b / a≤1.

2. The single cell according to claim 1, characterized in that: The thickness of the side wall (11) is a mm, satisfying: 0.5≤a≤0.

7.

3. The single cell according to claim 1, characterized in that: Along the first direction (Z), the size of the side wall (11) is H mm, and the size of the thickened portion (12) is h mm, satisfying: 0.3≤h / H≤1.

4. The single cell according to claim 1, characterized in that: The side wall (11) comprises a plurality of plane walls (111) and a plurality of transition walls (112); the plurality of plane walls (111) are arranged at intervals; two adjacent plane walls (111) are connected via the transition wall (112); and the transition wall (112) is rounded or chamfered.

5. The single cell according to claim 4, characterized in that: The plurality of plane walls (111) include a first side surface (1111), a second side surface (1112), a third side surface (1113) and a fourth side surface (1114) which are connected, the first side surface (1111) and the third side surface (1113) being parallel and opposite to each other, and the second side surface (1112) and the fourth side surface (1114) being parallel and opposite to each other; The first side surface (1111) and the third side surface (1113) are provided with the thickened portion (12) on the side facing away from the accommodating cavity (10), and / or the second side surface (1112) and the fourth side surface (1114) are provided with the thickened portion (12) on the side facing away from the accommodating cavity (10).

6. The single cell according to claim 4, characterized in that: The thickened portion (12) is connected to a side of the transition wall (112) facing away from the accommodating cavity (10).

7. The single cell according to claim 1, characterized in that: The thickened portion (12) has a third end surface (122) away from the opening (110), and the third end surface (122) is in an inclined surface structure or a concave arc surface structure.

8. The single cell according to claim 1, characterized in that: The first end surface (121) is a planar structure, the second end surface (1101) is a planar structure, and the first end surface (121) and the second end surface (1101) are flush with each other.

9. A battery pack, characterized in that: The invention comprises a single cell according to any one of claims 1 to 8.

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