Battery shell, battery, battery pack and electric equipment

Abstract

The utility model relates to a battery shell, a battery, a battery pack and electric equipment, the battery shell comprises a shell and a cover plate, and the shell comprises an inner cavity with an opening; the cover plate is used for shielding the opening, is welded and fixed with the shell and seals the inner cavity; the profile of the opening comprises a pair of parallel side edges and a pair of arc-shaped side edges, the two side edges of the pair of parallel side edges are parallel to each other, the pair of arc-shaped side edges comprises at least one pair of arcs, and the at least one pair of arcs protrude in the direction away from the geometric center of the opening. The opening outline of the shell of the battery shell comprises the pair of parallel side edges and the pair of arc-shaped side edges, the pair of arc-shaped side edges comprises at least one pair of arcs, and the arcs can replace corners of an existing opening outline, so that welding stress generated by welding is uniformly distributed on the arc-shaped side edges, and the battery shell can be compatible with relatively large deformation; the welding quality of the battery shell is improved.

Description

Technical Field

[0001] The present application relates to the field of battery casings, and particularly to a battery casing, a battery, a battery pack, and an electrical device using the same. Background Art

[0002] After the existing battery casing and the cover plate are welded, large welding stresses are likely to be generated, especially the gaps at the corners. It is difficult for the thinner casing to melt and fill the gaps, resulting in poor welding between the battery casing and the cover plate. Summary of the Utility Model

[0003] In view of the above technical problems, the purpose of the present application is to provide a battery casing capable of improving welding quality, a battery including the above battery casing, a battery pack including the above battery casing or the above battery, and an electrical device including the above battery or battery pack. Specifically, the technical solutions are as follows:

[0004] In a first aspect, an embodiment of the present application provides a battery casing, including a casing and a cover plate. The casing includes an inner cavity with an opening; the cover plate is used to shield the opening, and the cover plate is welded and fixed to the casing to seal the inner cavity; the contour of the opening includes a pair of parallel sides and a pair of arc-shaped sides. The two sides of the pair of parallel sides are parallel to each other, and the pair of arc-shaped sides includes at least a pair of arcs, and at least a pair of arcs protrude in a direction away from the geometric center of the opening.

[0005] The battery casing of the present application is welded and fixed to the casing by the cover plate to seal the inner cavity, so as to separate the components inside the battery from the outside; at the same time, the opening contour of the casing of the battery casing of the present application includes a pair of parallel sides and a pair of arc-shaped sides. The pair of arc-shaped sides includes at least a pair of arcs. The arcs can replace the corners of the existing opening contour, so that the welding stresses generated by welding are evenly distributed on the arc-shaped sides, which can accommodate larger deformations and improve the welding quality of the battery casing.

[0006] In one embodiment, the pair of arc-shaped sides includes a pair of arcs and two pairs of rounded edges. The diameter of the arc is greater than the distance between the pair of parallel sides, and each rounded edge is used to connect an arc and a parallel side.

[0007] In one embodiment, the pair of arc-shaped sides includes multiple pairs of arcs, and the multiple arcs are connected in sequence.

[0008] In this embodiment, each arc-shaped side includes multiple arcs, which can form various different-shaped inner cavities, so that the inner cavity can adapt to more types of battery cell components; at the same time, the multiple arcs connected in sequence can reduce the welding difficulty, improve the welding efficiency, and also reduce the welding deformation during the welding process.

[0009] In one embodiment, both ends of each arc-shaped side are tangent to the pair of parallel sides.

[0010] In this embodiment, the tangency between the arc-shaped side and the parallel side can reduce the welding difficulty, improve the welding efficiency, and also reduce the welding deformation during the welding process; meanwhile, it can also reduce the machining difficulty of the housing.

[0011] In one embodiment, the radius of each arc is greater than the thickness of the housing.

[0012] In this embodiment, the radius of the arc-shaped side is greater than the thickness of the housing to ensure that the deformation generated by welding can be evenly distributed on the arc-shaped side, avoid the accumulation of welding deformation resulting in poor welding, and improve the welding quality of the cover plate and the housing. In one embodiment, the cover plate includes an extending portion that extends towards the housing and is at least partially located in the inner cavity. Along the direction perpendicular to the extension direction of the extending portion, there is a gap between the extending portion and the inner wall of the inner cavity, and the gap is used to form a weld seam.

[0013] In this embodiment, part of the weld seam is located between the extending portion and the inner wall of the inner cavity, improving the connection strength between the cover plate and the housing and the sealing effect of the inner cavity.

[0014] In one embodiment, the cover plate includes an exposed portion that is located outside the housing along the extension direction of the extending portion, where: along the direction perpendicular to the extension of the extending portion, the outer side surface of the exposed portion is flush with the outer side surface of the housing, and the weld seam includes a butt weld seam; or along the direction perpendicular to the extension of the extending portion, the outer side surface of the exposed portion is spaced apart from the outer side surface of the housing, and the weld seam includes a fillet weld seam.

[0015] In one embodiment, along the direction of the cover plate towards the geometric center of the housing, the distance between the extending portion and the inner wall of the inner cavity gradually decreases.

[0016] In this embodiment, the gradually decreasing distance between the extending portion and the inner wall of the inner cavity can limit the molten metal during the welding process and avoid the spatter from affecting the internal battery cell assembly.

[0017] In one embodiment, along the extension direction of the extending portion, the size of the extending portion is greater than or equal to half of the size of the cover plate.

[0018] In this embodiment, the size of the extending portion being greater than or equal to half of the size of the cover plate is to increase the size of the weld seam between the extending portion and the inner wall of the inner cavity and ensure the sealing effect of the inner cavity.

[0019] In a second aspect, the embodiments of the present application further provide a battery, which includes a battery cell assembly and the above-mentioned battery housing, and the battery cell assembly is disposed in the inner cavity of the battery housing.

[0020] In one embodiment, the battery cell assembly includes a first battery cell and two second battery cells. Along the arrangement direction of a pair of parallel side edges, the first battery cell is located between the two second battery cells. Along the arrangement direction of a pair of arc-shaped side edges, the size of the first battery cell is larger than that of the two second battery cells.

[0021] In this embodiment, the sizes of the second battery cells on both sides are smaller than that of the first battery cell in the middle, so that the first battery cell and the second battery cells can fill the inner cavity of the housing as much as possible, thereby improving the space utilization rate of the inner cavity and ensuring that the battery has a high energy density.

[0022] In one embodiment, along the arrangement direction of a pair of parallel side edges, the size of the first battery cell is greater than or equal to the sum of the sizes of the two second battery cells.

[0023] In this embodiment, the sizes of the first battery cell and the second battery cells along the arrangement direction of a pair of parallel side edges are limited, so that the first battery cell and the second battery cells can fill the inner cavity of the housing as much as possible, thereby improving the space utilization rate of the inner cavity and ensuring that the battery has a high energy density.

[0024] In a third aspect, an embodiment of the present application further provides a battery pack. The battery pack includes a tray, a battery cell assembly, and the above-mentioned battery housing. The battery housing is disposed in the tray, and the battery cell assembly is disposed in the inner cavity of the battery housing; or the battery pack includes a tray and the above-mentioned battery, and the battery is disposed in the tray.

[0025] In a fourth aspect, an embodiment of the present application further provides an electrical device. The electrical device includes the above-mentioned battery or the above-mentioned battery pack.

[0026] It can be understood that the battery, the battery pack, and the electrical device of the present application have better welding quality and longer service life due to the adoption of the battery housing of the present application. Description of the Drawings

[0027] Figure 1 It is a schematic exploded view of the battery housing provided in an embodiment of the present application;

[0028] Figure 2 It is a schematic structural view of the battery housing provided in an embodiment of the present application;

[0029] Figure 3 It is a schematic structural view of the housing provided in an embodiment of the present application;

[0030] Figure 4 It is a schematic partial structural view of the housing provided in an embodiment of the present application;

[0031] Figure 5 It is a schematic structural view of the housing provided in another embodiment of the present application;

[0032] Figure 6 Schematic diagram of a partial structure of the housing provided in another embodiment of the present application;

[0033] Figure 7 Schematic diagram of the structure of the cover plate provided in an embodiment of the present application;

[0034] Figure 8 Partial cross-sectional view of the cover plate provided in an embodiment of the present application;

[0035] Figure 9 Cross-sectional view of the battery housing provided in an embodiment of the present application;

[0036] Figure 10 Partial cross-sectional view of the battery housing provided in an embodiment of the present application;

[0037] Figure 11 Partial cross-sectional view of the battery housing provided in another embodiment of the present application;

[0038] Figure 12 Exploded view of the battery provided in an embodiment of the present application;

[0039] Figure 13 One cross-sectional view of the battery provided in an embodiment of the present application;

[0040] Figure 14 Another cross-sectional view of the battery provided in an embodiment of the present application.

[0041] Reference numerals:

[0042] 100 - Battery housing; 10 - Housing; 11 - Opening; 111 - Parallel side; 112 - Arc side; 113 - Rounded corner; 12 - Inner cavity; 20 - Cover plate; 21 - Through hole; 22 - Groove; 23 - Insertion part; 24 - Exposed part; 30 - Terminal; 31 - Outer terminal; 32 - Inner terminal; 110 - Battery cell assembly; 1101 - First battery cell; 1102 - Second battery cell; 120 - Tab; 130 - Seal; 200 - Battery. Detailed description of the invention

[0043] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0044] The following descriptions of various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present application can be implemented. The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The terms "connection" and "coupling" as used in the present application, unless otherwise specified, both include direct and indirect connections (couplings). The directional terms mentioned in the present application, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., are only with reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer illustration and understanding of the present application, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0045] Please refer to Figure 1 and Figure 2 , wherein, Figure 1 schematically shows an exploded structural view of a battery housing 100 provided in an embodiment of the present application; Figure 2 schematically shows a structural view of a battery housing 100 provided in an embodiment of the present application.

[0046] The battery housing 100 of the present application includes a housing 10 and a cover plate 20. The housing 10 includes an inner cavity 12 having an opening 11. The cover plate 20 is used to cover the opening 11. The cover plate 20 is fixedly welded to the housing 10 to seal the inner cavity 12.

[0047] Specifically, in one embodiment, as Figure 1 and Figure 2 shown, the housing 10 includes an inner cavity 12. The inner cavity 12 has two openings 11 respectively provided on both sides. Two cover plates 20 respectively cover the two openings 11 of the inner cavity 12. The housing 10 is fixedly welded to the two cover plates 20 respectively. The housing 10 and the two cover plates 20 seal the inner cavity 12 through welds to separate the inner cavity 12 from the outside.

[0048] Please refer to Figure 3 the structural view of the housing 10 provided in an embodiment of the present application schematically shown.

[0049] The contour of the opening 11 of the battery housing 100 of the present application includes a pair of parallel side edges 111 and a pair of arc-shaped side edges 112. The two side edges of the pair of parallel side edges 111 are parallel to each other. The pair of arc-shaped side edges 112 includes at least a pair of circular arcs. The at least a pair of circular arcs respectively protrude in the direction away from the geometric center of the opening 11.

[0050] Specifically, in one embodiment, as Figure 3As shown, along the extension direction of the parallel side edges 111, a pair of arc-shaped side edges 112 are respectively located on both sides of the pair of parallel side edges 111. Each arc-shaped side edge 112 is connected between the pair of parallel side edges 111, and the arcs in the arc-shaped side edges 112 protrude in the direction away from the geometric center of the opening 11, that is, the arcs protrude in the direction away from the central position of the housing 10.

[0051] The housing 10 of the battery housing 100 of the present application is welded and fixed to the cover plate 20 to seal the inner cavity 12, ensuring that the battery housing 100 can separate the internal components from the outside world and prevent external substances from affecting the normal operation of the components in the inner cavity 12 of the battery housing 100.

[0052] In the existing battery housing, due to the relatively thin thickness of the battery housing, it is often difficult to fill the corner gaps after the battery housing melts, and welding defects such as welding holes are likely to occur, resulting in higher processing accuracy requirements and greater welding difficulty for the existing battery housing.

[0053] In addition, during the welding process of the existing housing and cover plate, some metals in the housing and cover plate melt and fill the gap between the housing and the cover plate to form a weld, which will cause large welding deformation, resulting in large residual stress between the welded housing and cover plate, and cracks are likely to occur, posing a safety hazard to the battery housing and being unfavorable for the long-term use of the battery housing.

[0054] The opening 11 contour of the housing 10 of the battery housing 100 of the present application includes a pair of parallel side edges 111 and a pair of arc-shaped side edges 112. The pair of arc-shaped side edges 112 include at least a pair of arcs, and the arcs replace the corners in the existing battery housing, so that the gap between the housing 10 and the cover plate 20 is smaller, thereby improving the welding quality between the housing 10 and the cover plate 20.

[0055] During the welding process of the housing 10 and the cover plate 20, the welding deformation will be evenly distributed along the arc-shaped side edges, avoiding the concentration of welding deformation resulting in gap tolerance exceeding, and avoiding the failure of the battery housing 100 of the present application due to residual stress, thereby extending its service life.

[0056] It can be understood that there is no corner gap between the housing 10 and the cover plate 20 of the battery housing 100 of the present application, which can reduce the processing accuracy requirements and welding difficulty of the battery housing 100, improve the production efficiency of the battery housing 100 and reduce its production cost.

[0057] The embodiment of the present application further provides a battery 200, which includes a battery cell assembly 110 and the above-mentioned battery housing 100, and the battery cell assembly 110 is disposed in the inner cavity 12 of the battery housing 100.

[0058] An embodiment of the present application further provides a battery pack, which includes a tray, a battery cell assembly 110, and the above-mentioned battery housing 100. The battery housing 100 is disposed in the tray, and the battery cell assembly 110 is disposed in the inner cavity 12 of the battery housing 100; or the battery pack includes a tray and the above-mentioned battery 200, and the battery 200 is disposed in the tray.

[0059] An embodiment of the present application further provides an electrical device, which includes the above-mentioned battery 200 or the above-mentioned battery pack.

[0060] Since the battery 200, the battery pack, and the electrical device of the present application adopt the above-mentioned battery housing 100, they have better welding quality and longer service life.

[0061] In addition, in an embodiment where multiple batteries 200 are stacked or in an embodiment where multiple battery housings 100 in the battery pack are stacked in the tray, a gap is left between the arc-shaped sides 112 of the multiple battery housings 100. The gap can serve as a heat dissipation channel for the multiple batteries 200 or the battery pack to improve its heat dissipation efficiency.

[0062] In some other embodiments, the arc-shaped sides 112 of the multiple battery housings 100 enclose to form a cooling channel, and a cooling medium is filled in the cooling channel to improve its heat dissipation efficiency.

[0063] In some other embodiments, along the arrangement direction of a pair of parallel sides 111, multiple batteries 200 are arranged in sequence or multiple battery housings 100 are arranged in sequence in the tray to ensure the energy density.

[0064] It should be noted that the battery housing 100 of the present application can not only be applied to the battery 200 or the battery pack, but also be equally applicable to other structures or devices that require welding and sealing. The structures or devices adopting the battery housing 100 of the present application have better welding quality and longer service life. Please refer to Figures 4 - 6 , where Figure 4 shows a partial structural schematic diagram of the housing 10 provided in an embodiment of the present application; Figure 5 shows a structural schematic diagram of the housing 10 provided in another embodiment of the present application; Figure 6 shows a partial structural schematic diagram of the housing 10 provided in another embodiment of the present application.

[0065] In one embodiment, both ends of each arc-shaped side 112 are tangent to a pair of parallel sides 111 respectively. In another embodiment, a pair of arc-shaped sides 112 further includes two pairs of rounded edges 113. Each rounded edge 113 is connected between one end of an arc-shaped side 112 and a parallel side 111. Both ends of each rounded edge are tangent to an arc-shaped side 112 and a parallel side 111 respectively.

[0066] In one embodiment, both ends of each arc-shaped side 112 are respectively tangent to a pair of parallel sides 111.

[0067] In Figure 4 In the provided battery housing 100, a pair of arc-shaped sides 112 includes a pair of circular arcs, and both ends of the circular arcs are respectively tangent to a pair of parallel sides 111. At this time, the diameter of the circular arc is equal to the distance between the pair of parallel sides 111.

[0068] In one embodiment, a pair of arc-shaped sides 112 includes a pair of circular arcs and two pairs of rounded edges 113. The diameter of the circular arc is greater than the distance between a pair of parallel sides 111. Each rounded edge 113 is used to connect a circular arc and a parallel side 111.

[0069] In Figure 5 and Figure 6 In the provided battery housing 100, both ends of an arc-shaped side 112 are respectively connected to a pair of parallel sides 111 through two rounded edges 113. The rounded edges 113 are respectively tangent to the arc-shaped side 112 and the parallel side 111. At this time, the diameter of the circular arc is greater than or less than the distance between the pair of parallel sides 111.

[0070] In one embodiment, a pair of arc-shaped sides 112 includes multiple pairs of circular arcs. The multiple circular arcs are connected in sequence and form inner cavities 12 of various different shapes, so that the inner cavities 12 can be adapted to more types of battery cell assemblies 110; at the same time, the multiple circular arcs connected in sequence can reduce the welding difficulty, improve the welding efficiency, and also reduce the welding deformation during the welding process.

[0071] In one embodiment, a pair of arc-shaped sides 112 includes multiple pairs of circular arcs, and two adjacent circular arcs are tangent to each other. Two adjacent circular arcs among the multiple circular arcs are tangent to each other, avoiding the occurrence of corner gaps, so that the welding deformation during the welding process of the housing 10 and the cover plate 20 can be evenly distributed on the arc-shaped side 112, avoiding the accumulation of welding deformation, and thus improving the welding quality of the battery housing 100.

[0072] In one embodiment, a pair of arc-shaped sides 112 includes multiple pairs of circular arcs. The two circular arcs located at both ends of the arc-shaped side 112 among the multiple pairs of circular arcs are respectively tangent to the parallel sides 111. At this time, the sum of the diameters of the multiple circular arcs is equal to the distance between the pair of parallel sides 111.

[0073] In one embodiment, a pair of arc-shaped sides 112 includes multiple pairs of circular arcs and two pairs of rounded edges 113. Both ends of an arc-shaped side 112 are respectively connected to a pair of parallel sides 111 through two rounded edges 113. The two circular arcs located at both ends of the arc-shaped side 112 among the multiple pairs of circular arcs are respectively tangent to the two rounded edges 113. At this time, the sum of the diameters of the multiple circular arcs is greater than or less than the distance between the pair of parallel sides 111.

[0074] In one embodiment, the radius of each arc is greater than the thickness of the housing 10.

[0075] In one embodiment, as Figure 4 shown, the arc of the arc-shaped side 112 enables the gap between the housing 10 and the cover plate 20 to be evenly distributed. The radius of the arc being greater than the thickness of the housing 10 enables the housing 10 and the cover plate 20 to evenly fill the gap, and the welding deformation can be evenly distributed along the arc, avoiding the accumulation of welding deformation, thereby improving the welding quality of the battery housing 100.

[0076] In one embodiment, the range of the thickness t1 of the housing 10 is 0.05 mm - 0.3 mm.

[0077] In one embodiment, the range of the radius R of the arc of the arc-shaped side 112 is 7 mm - 25 mm.

[0078] In one embodiment, the radius of the arc of the arc-shaped side 112 is greater than the radius of the rounded corner side 113. In Figure 6 the provided battery housing 100, the radius of the arc of the arc-shaped side 112 is R1, the radius of the arc is greater than the distance between a pair of parallel sides 111, the radius of the rounded corner side 113 is R2, and R1 is greater than R2.

[0079] Please refer to Figure 7 the schematic structural diagram of the cover plate 20 provided in one embodiment of the present application.

[0080] In one embodiment, as Figure 7 shown, the cover plate 20 includes a through hole 21. Please combine Figure 1 , the battery housing 100 includes a pole post 30. The pole post 30 is at least partially located in the through hole 21, and a part of the pole post 30 is exposed outside the cover plate 20. One end of the pole post 30 is electrically connected to the battery cell assembly 110 in the inner cavity 12, and the other end is used to conduct electricity to an external electrical device.

[0081] Please refer to Figure 8 the partial cross-sectional schematic diagram of the cover plate 20 provided in one embodiment of the present application.

[0082] In one embodiment, as Figure 8 shown, the cover plate 20 is provided with a groove 22. The groove 22 is located on the side of the cover plate 20 away from the housing 10. The groove 22 facilitates welding the housing 10 and the cover plate 20 by means of top welding, so as to reduce the welding difficulty between the housing 10 and the cover plate 20 and improve the welding efficiency.

[0083] In other embodiments, the housing 10 and the cover plate 20 are welded by side welding to form the battery housing 100, so as to reduce the spatter during the welding process and avoid affecting the battery cell assembly 110.

[0084] In one embodiment, as Figure 8 shown, along the arrangement direction of the housing 10 and the cover plate 20, the dimension of the cover plate 20 located outside the inner cavity 12 is h2, and h2 ≥ 2 × t1. It can be understood that sufficient h2 in the cover plate 20 can ensure that the gap between the housing 10 and the cover plate 20 is fully filled when welding by the method of top welding.

[0085] In one embodiment, the depth of the groove is greater than or equal to twice of h2 to ensure that during the welding process of the housing 10 and the cover plate 20, the clamping force of the fixture causes less deformation of the cover plate 20.

[0086] Please refer to Figure 9 and Figure 10 , wherein, Figure 9 schematically shows a cross-sectional view of the battery housing 100 provided in one embodiment of the present application; Figure 10 schematically shows a partial cross-sectional view of the battery housing 100 provided in one embodiment of the present application.

[0087] In one embodiment, the cover plate 20 includes an extending portion 23. The extending portion 23 extends towards the housing 10 and is at least partially located in the inner cavity 12. A gap is left between the extending portion 23 and the inner wall of the inner cavity 12 along the direction perpendicular to the extending direction of the extending portion 23, and the gap is used to form a weld seam.

[0088] In one embodiment, as Figure 9 and Figure 10 shown, the extending portion 23 extends into the inner cavity 12, and part of the weld seam is located between the extending portion 23 and the inner wall of the inner cavity 12, improving the connection strength between the cover plate 20 and the housing 10 and the sealing effect of the inner cavity 12.

[0089] In one embodiment, along the direction of the cover plate 20 towards the geometric center of the housing 10, that is, along the direction of the cover plate 20 towards the central position of the housing 10, the distance between the extending portion 23 and the inner wall of the inner cavity 12 gradually decreases, thereby restricting the molten metal during the welding process and avoiding the spatter from affecting the internal cell assembly 110.

[0090] In another embodiment, the inner wall of the inner cavity 12 is provided with protruding portions. The protruding portions and the extending portion 23 are spaced from each other along the extending direction of the extending portion 23. The protruding portions are used to shield at least part of the gap between the extending portion 23 and the inner wall of the inner cavity 12 to prevent the spatter from entering the interior and affecting the cell assembly 110.

[0091] In one embodiment, along the extending direction of the extending portion 23, the dimension of the extending portion 23 is greater than or equal to half of the dimension of the cover plate 20. In Figure 8In the provided battery housing 100, the size of the cover plate 20 is h1, the size of the exposed portion 24 is h2, and the difference between h1 and h2 is greater than or equal to half of h1, that is, h1 - h2 ≥ h1 / 2, so as to increase the size of the weld between the extending portion 23 and the inner wall of the inner cavity 12 and ensure the sealing effect of the inner cavity 12.

[0092] In one embodiment, as Figure 8 shown, the cover plate 20 includes an exposed portion 24. Along the extending direction of the extending portion 23, the exposed portion 24 is located outside the housing 10. Along the direction perpendicular to the arrangement direction of the housing 10 and the cover plate 20, the outer side surface of the extending portion 23 and the outer side surface of the exposed portion 24 are spaced apart from each other, and the spacing dimension is t2.

[0093] In one embodiment, as Figure 10 shown, t2 is equal to t1. The weld formed by welding is located between the end face of the exposed portion 24 facing the housing 10 and the end face of the housing 10 facing the exposed portion 24, and between the extending portion 23 and the inner wall of the inner cavity 12, which can realize the welding of the cover plate 20 and the housing 10 and seal the inner cavity 12.

[0094] Please refer to Figure 11 the partial cross-sectional schematic diagram of the battery housing 100 provided in another embodiment of the present application shown in the schematic diagram.

[0095] In one embodiment, the cover plate 20 includes an exposed portion 24. Along the extending direction of the extending portion 23, the exposed portion 24 is located outside the housing 10, wherein: along the direction perpendicular to the extension of the extending portion 23, the outer side surface of the exposed portion 24 is flush with the outer side surface of the housing 10, and the weld includes a butt weld. In Figure 10 the provided battery housing 100, the cover plate 20 and the housing 10 are fixedly connected by a butt weld and seal the inner cavity 12.

[0096] In one embodiment, along the direction perpendicular to the extension of the extending portion 23, the outer side surface of the exposed portion 24 and the outer side surface of the housing 10 are spaced apart from each other, and the weld includes a fillet weld. In Figure 11 the provided battery housing 100, t1 is greater than t2. The cover plate 20 and the housing 10 can be welded by fillet welding. The weld formed by welding is located between the outer side surface of the exposed portion 24 and the end face of the housing 10 facing the exposed portion 24, and can also realize the welding of the cover plate 20 and the housing 10 and seal the inner cavity 12.

[0097] In another embodiment, t1 is less than t2. The cover plate 20 and the housing 10 can be welded by fillet welding. The weld formed by welding is located between the end face of the exposed portion 24 facing the housing 10 and the outer side surface of the housing 10, and can also realize the welding of the cover plate 20 and the housing 10 and seal the inner cavity 12.

[0098] Please refer to Figures 12 - 14, wherein, Figure 12 shows an exploded view of the battery 200 provided in an embodiment of the present application; Figure 13 shows a cross-sectional view of the battery 200 provided in an embodiment of the present application; Figure 14 shows another cross-sectional view of the battery 200 provided in an embodiment of the present application.

[0099] In one embodiment, the battery 200 includes a battery cell assembly 110 and the above-mentioned battery housing 100, and the battery cell assembly 110 is disposed in the inner cavity 12 of the battery housing 100.

[0100] In one embodiment, as Figure 12 and Figure 13 shown, the battery cell assembly 110 is disposed in the inner cavity 12. The battery cell assembly 110 includes a first battery cell 1101 and a second battery cell 1102. Please refer to Figure 1 , the two openings 11 on both sides of the inner cavity 12 are respectively shielded by two cover plates 20 to separate the battery cell assembly 110 from the outside. Each cover plate 20 is respectively provided with a terminal post 30 and a tab 120. Both the first battery cell 1101 and the second battery cell 1102 are electrically connected to the terminal post 30 through the tab 120, so that the battery cell assembly 110 can supply power to external electrical devices.

[0101] It can be understood that one of the first battery cell 1101 and the second battery cell 1102 can be used as the positive electrode of the battery 200, and the other as the negative electrode, and they are electrically connected to the electrical device through the tab 120 and the terminal post 30.

[0102] In one embodiment, as Figure 12 and Figure 13 shown, the terminal post 30 includes an outer terminal post 31 and an inner terminal post 32. Both the outer terminal post 31 and the inner terminal post 32 are partially located in the through hole 21 and the outer terminal post 31 is electrically connected to the inner terminal post 32. The outer terminal post 31 is partially exposed outside the cover plate 20 for electrical connection to an external electrical device, and the inner terminal post 32 is partially located in the inner cavity 12 and is electrically connected to the battery cell assembly 110 through the tab 120.

[0103] In one embodiment, as Figure 12 and Figure 13 shown, the battery 200 includes a seal 130. The seal 130 cooperates with the inner terminal post 32 to shield the through hole 21 and prevent the gap between the inner terminal post 32 and the through hole 21 from causing seal failure.

[0104] In one embodiment, the material of the seal 130 includes an insulating material to prevent the inner terminal post 32 from directly contacting the cover plate 20 and causing the cover plate 20 to be charged.

[0105] In one embodiment, as Figure 12 andFigure 13 As shown, the first battery cell 1101 is located between two second battery cells 1102. The battery housing 100 includes two cover plates 20, and each cover plate 20 is provided with a pole column 30. One of the pole columns 30 is electrically connected to the first battery cell 1101 through a tab 120, and the other pole column 30 is electrically connected to the two second battery cells 1102 through two tabs 120 respectively.

[0106] In one embodiment, the battery cell assembly 110 includes a first battery cell 1101 and two second battery cells 1102. Along the arrangement direction of a pair of parallel sides 111, the first battery cell 1101 is located between the two second battery cells 1102. Along the arrangement direction of a pair of arc-shaped sides 112, the size of the first battery cell 1101 is larger than that of the two second battery cells 1102, so that the first battery cell 1101 and the second battery cells 1102 can fill the inner cavity 12 of the housing 10 as much as possible, thereby improving the space utilization rate of the inner cavity 12 and ensuring that the battery 200 has a high energy density.

[0107] In one embodiment, as Figure 12 shown, the first battery cell 1101 is located between two second battery cells 1102. Please refer to Figure 14 , along the arrangement direction of a pair of arc-shaped sides 112, the size of the second battery cell 1102 is smaller than that of the first battery cell 1101. It can be understood that the distance between the middle parts of a pair of arc-shaped sides 112 is larger than that between the two ends. That is, along the arrangement direction of a pair of arc-shaped sides 112, the first battery cell 1101 located in the middle has more accommodation space. Setting the size of the first battery cell 1101 to be larger than that of the two second battery cells 1102 enables the first battery cell 1101 to make full use of the space formed by a pair of arc-shaped sides 112, thereby improving the space utilization rate of the inner cavity 12 and the energy density of the battery 200.

[0108] In one embodiment, along the arrangement direction of a pair of parallel sides 111, the size of the first battery cell 1101 is greater than or equal to the sum of the sizes of the two second battery cells 1102.

[0109] In one embodiment, as Figure 14 shown, along the arrangement direction of a pair of parallel sides 111, the size of the first battery cell 1101 is larger than the sum of the sizes of the two second battery cells 1102, so that the first battery cell 1101 can make full use of the space formed by a pair of arc-shaped sides 112, and similarly, the space utilization rate of the inner cavity 12 and the energy density of the battery 200 can be improved.

[0110] In some embodiments, the specific sizes of the first battery cell 1101 and the second battery cells 1102 can be set according to the specific shape of the opening 11, so that the first battery cell 1101 and the second battery cells 1102 can fill the inner cavity 12 as much as possible to improve the energy density of the battery 200.

[0111] In one embodiment, the battery 200 includes a wound battery cell and the above-described battery housing 100. The wound battery cell is disposed in the inner cavity 12 of the battery housing 100. Since the wound battery cell can be adapted to inner cavities 12 of various shapes, the battery 200 of the present application can also obtain a relatively high energy density by using the wound battery cell.

[0112] In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A battery casing, characterized in that: include: a housing including an inner cavity having an opening; A cover plate, used for covering the opening, the cover plate being welded and fixed to the shell and sealing the inner cavity; The outline of the opening includes a pair of parallel sides and a pair of arcuate sides, the two sides of the pair of parallel sides are parallel to each other, the pair of arcuate sides includes at least one pair of arcs, and the at least one pair of arcs protrude in a direction away from the geometric center of the opening.

2. The battery casing according to claim 1, characterized in that: Two ends of each of the arc-shaped sides are respectively tangent to the pair of parallel sides.

3. The battery housing according to claim 1, characterized in that: The pair of arc-shaped side edges include a pair of circular arcs and two pairs of rounded edges, the diameter of the circular arc is greater than the distance between the pair of parallel side edges, and each of the rounded edges is used to connect one of the circular arcs and one of the parallel side edges.

4. The battery housing according to claim 1, characterized in that: The pair of arc-shaped sides includes multiple pairs of arcs, and the multiple arcs are connected in sequence.

5. The battery housing according to claim 1, characterized in that: The radius of each of the arcs is greater than the thickness of the shell.

6. The battery housing according to any one of claims 1 to 5, characterized in that: The cover plate includes an extending portion, which extends toward the shell and is at least partially located in the inner cavity. A gap is left between the extending portion and the inner wall of the inner cavity along an extending direction perpendicular to the extending portion, and the gap is used to form a weld.

7. The battery housing according to claim 6, characterized in that: The cover plate includes an exposed portion, and the exposed portion is located outside the housing along the extension direction of the protruding portion, wherein: An outer side surface of the exposed portion is flush with an outer side surface of the shell along a direction perpendicular to the extending direction of the protruding portion, and the weld comprises a butt weld; or An outer side surface of the exposed portion and an outer side surface of the shell are spaced apart from each other along a direction perpendicular to an extension direction of the protruding portion, and the weld includes a fillet weld.

8. The battery casing according to claim 6, characterized in that: Along the direction from the cover plate toward the geometric center of the shell, the distance between the protruding portion and the inner wall of the inner cavity gradually decreases.

9. The battery casing according to claim 6, characterized in that: Along the extending direction of the protruding portion, the size of the protruding portion is greater than or equal to half of the size of the cover plate.

10. A battery, characterized in that: It comprises a battery cell assembly and the battery casing according to any one of claims 1 to 9, wherein the battery cell assembly is arranged in the inner cavity of the battery casing.

11. The battery according to claim 10, characterized in that: The battery cell assembly includes a first battery cell and two second battery cells. The first battery cell is located between the two second battery cells along the arrangement direction of the pair of parallel sides. The size of the first battery cell is larger than that of the two second battery cells along the arrangement direction of the pair of arc-shaped sides.

12. The battery according to claim 11, characterized in that: A size of the first battery cell along an arrangement direction of the pair of parallel sides is greater than or equal to a sum of sizes of the two second battery cells.

13. A battery pack, characterized in that: Comprising a tray, a battery cell assembly and the battery housing according to any one of claims 1 to 9, wherein the battery housing is arranged in the tray, and the battery cell assembly is arranged in the inner cavity of the battery housing; or The invention comprises a tray and the battery according to any one of claims 10 to 12, wherein the battery is arranged in the tray.

14. An electrical device, characterized in that: A battery comprising any one of claims 10 to 12; or Comprising the battery pack as claimed in claim 13.

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