Battery

Abstract

The utility model discloses a battery. The battery comprises a battery cell, a shell assembly and an outer coating film, the shell assembly comprises a bottom shell and a cover body, the bottom shell is provided with a first groove, the cover body is arranged on the bottom shell in a covering mode, an installation cavity is defined by the cover body and the first groove, the periphery of the cover body is provided with a first sunken part, the first sunken part is sunken in the direction close to the bottom shell along the surface, away from the bottom shell, of the cover body, and the bottom shell is located at the bottom of the cover body; the bottom shell and the cover body are welded to form a welding seam which is located on the peripheral side wall of the battery and lower than the bottom face of the first concave part. And the battery cell is arranged in the mounting cavity. The outer wrapping film comprises a main body part and a flanging part, the main body part wraps the outer surface of the bottom shell, and the flanging part is arranged on the side, close to the cover body, of the main body part and extends to cover the bottom face of the first concave part. The battery at least solves the problem of low space utilization rate of the battery in the prior art.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular, to a battery. Background Art

[0002] Power batteries have the characteristics of high energy density, long cycle life, no memory effect and environmental friendliness, and are widely used in plug-in hybrid electric vehicles, hybrid electric vehicles and pure electric vehicles. Energy storage batteries are mainly used in solar power generation equipment, wind power generation equipment and renewable energy storage batteries.

[0003] However, in existing batteries, the cover is a plate-like structure and is welded to the top of the battery cell with the bottom shell. The outer periphery of the cover and the bottom shell is covered with an outer film. Since the cover and the outer film have a certain thickness, the volume of the battery cell cannot be too large, resulting in a low battery capacity and low space utilization. Utility Model Content

[0004] The main purpose of the present application is to provide a battery to at least solve the problem of low space utilization of batteries in the prior art.

[0005] According to one aspect of the present application, a battery is provided, comprising:

[0006] A shell assembly, the shell assembly comprising a bottom shell and a cover body, the bottom shell having a first groove, the cover body being covered on the bottom shell and surrounding the first groove to form a mounting cavity, the outer periphery of the cover body being provided with a first recessed portion, the first recessed portion being recessed along a surface of the cover body away from the bottom shell toward a direction close to the bottom shell, and the bottom shell being located at the bottom of the cover body, the bottom shell and the cover body being welded to form a weld, the weld being located at an outer peripheral side wall of the battery and lower than a bottom surface of the first recessed portion;

[0007] A battery cell, wherein the battery cell is arranged in the installation cavity;

[0008] The outer membrane includes a main body and a flange portion, wherein the main body is coated on the outer surface of the bottom shell, and the flange portion is arranged on a side of the main body close to the cover body and extends to cover the bottom surface of the first recessed portion.

[0009] Furthermore, a surface of the flange portion facing away from the main body portion is lower than a surface of the cover body facing away from the first groove.

[0010] Further, along the first direction, the thickness Tm of the flange portion and the maximum depth T4 of the first recessed portion satisfy the relationship: 0.05 mm ≤ Tm ≤ T4 ≤ 20 mm.

[0011] Furthermore, along the first direction, the maximum weld width M1 of the weld satisfies the relationship: 0.3 mm ≤ M1 ≤ 5 mm; and / or,

[0012] Along the inner and outer directions of the cover body, the maximum penetration depth D1 of the weld satisfies the relationship: 0.3 mm ≤ D1 ≤ 10 mm; and / or,

[0013] A first surface is disposed on a side of the cover body facing away from the bottom shell, and along a first direction, a minimum spacing H between the welding seam and the first surface satisfies the relationship: 0.1 mm≤H≤5 mm.

[0014] Further, the first recessed portion includes a first bottom surface, and a length L2 of the first recessed portion along the second direction, a length H3 of the first bottom surface along the inner and outer directions of the cover body, and a length L0 of the cover body along the second direction satisfy the relationship: 5mm≤L2+H3≤L0-0.2mm≤1m; and / or,

[0015] The width W2 of the first recessed portion along the third direction, the length H3 of the first bottom surface along the inner and outer directions of the cover body, and the width W0 of the cover body along the second direction satisfy the relationship: 5mm≤W2+H3≤W0-0.2mm≤1m; and / or,

[0016] Along the first direction, the maximum depth T4 of the first recessed portion satisfies the relationship: 0≤T4≤20mm.

[0017] Furthermore, the cover body comprises:

[0018] A cover plate, wherein a third groove is provided on a side of the cover plate close to the first groove, and the third groove is recessed in a direction away from the bottom shell;

[0019] An insulating sheet is laid on a side of the cover sheet close to the first groove, and a second groove is provided on a side of the insulating sheet away from the cover sheet, and at least a portion of the insulating sheet provided with the second groove is embedded in the third groove.

[0020] Furthermore, the cover plate also includes an outer flange, which extends inward and outward directions of the cover plate, and a first side wall is provided around the outer periphery of the third groove, and a step is provided between the outer flange and the first side wall, and the end surface of the bottom shell overlaps the step, and the outer flange and the bottom shell are welded by a weld.

[0021] Furthermore, along the second direction, the length L3 of the cover sheet and the length L1 of the first side wall, and the distance H2 between the outer edge of the outer flange and the outer surface of the first side wall satisfy the relationship: 5mm≤L1+H2≤L3-0.2mm≤1m; and / or,

[0022] Along the third direction, the width W3 of the cover sheet and the width W1 of the first side wall, and the distance H2 between the outer edge of the outer flange and the outer surface of the first side wall satisfy the relationship: 5mm≤W1+H2≤W3-0.2mm≤1m; and / or,

[0023] Along the first direction, the thickness T0 of the cover sheet, the height T1 of the first side wall, the thickness T2 of the outer flange, and the depth T3 of the third groove satisfy the relationship: 0.5 mm ≤ T1 ≤ T3 ≤ 50 mm, 0.3 mm ≤ T2 ≤ T0 ≤ 10 mm; and / or,

[0024] A distance H2 between the outer edge of the outer flange and the outer surface of the first side wall satisfies the relationship: 0.1 mm ≤ H2 ≤ 25 mm.

[0025] Furthermore, a second recessed portion opposite to the first side wall is provided on the outer periphery of the insulating sheet;

[0026] Wherein, along the inner and outer directions of the insulating sheet, the width H5 of the bottom surface of the second recessed portion and the thickness H1 of the side wall of the third groove satisfy the relationship 0≤H5-H1≤10mm; and / or,

[0027] Along the first direction, the maximum depth T5 of the second recessed portion and the maximum depth T3 of the third groove satisfy the relationship: 0≤T5-T3≤10mm; and / or,

[0028] Along the second direction, the length L1 of the first side wall and the length L5 of the second recessed portion satisfy the relationship: 0≤L1-L5≤2mm; and / or,

[0029] Along the third direction, the width W1 of the first side wall and the width W5 of the second recessed portion satisfy the relationship: 0≤W1-W5≤2mm; and / or,

[0030] Along the first direction, the maximum depth T5 of the second recessed portion satisfies the relationship: 0≤T5≤20mm.

[0031] Furthermore, the thickness Tk of the side wall of the bottom shell and the distance H2 between the outer edge of the outer flange and the outer surface of the first side wall both satisfy the relationship: 0.2mm≤Tk≤H2-0.3mm≤3.5mm.

[0032] Furthermore, along the first direction, the projected area S1 of the first side wall, the projected area S2 of the bottom of the third groove, and the cross-sectional area S3 of the outer flange assembled on the side wall of the bottom shell along the inner and outer directions of the cover plate satisfy the relationship: 150mm2≤S1≤S3≤1m2, 0.015<S1 / S2<0.3, 1≤S2 / S3≤1.5.

[0033] Compared with the prior art, the battery cover of the present application is provided with a first recessed portion, the bottom shell and the cover are connected by welding, the weld is not higher than the bottom surface of the first recessed portion, and the bottom surface of the first recessed portion is coated with a flange portion of an outer film. In the present application, the provision of the first recessed portion facilitates the flange portion to be provided in the first recessed portion, which means that the flange portion will not protrude too much from the surface of the cover away from the bottom shell, and the proportion of the cover and the flange portion in the overall volume of the battery is reduced. At the same time, the weld does not protrude from the bottom surface of the first recessed portion, so that the flange portion can be arranged in contact with the bottom surface of the first recessed portion, avoiding the problem that the flange portion protrudes from the bottom surface of the first recessed portion due to the weld, making the height of the battery in the first direction too large, and the proportion of the cover and the outer film in the overall volume of the battery is too large, resulting in low space utilization of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0035] Figure 1 A schematic diagram of the structure of the battery disclosed in this application;

[0036] Figure 2 A schematic diagram of the explosion structure of the battery disclosed in this application;

[0037] Figure 3 A schematic diagram of the welding structure of a part of the structure of the battery disclosed in this application (without the outer film and the insulating sheet);

[0038] Figure 4 for Figure 3 Enlarged schematic diagram of the middle I area;

[0039] Figure 5 This is a schematic diagram of the welding structure of the battery disclosed in this application;

[0040] Figure 6 for Figure 5 Enlarged schematic diagram of the middle II area;

[0041] Figure 7 This is a schematic structural diagram of the cover body disclosed in the present application at a first viewing angle;

[0042] Figure 8It is a structural schematic diagram of the cover body disclosed in the present application at a second viewing angle;

[0043] Fig. 9 It is a schematic structural diagram of the cover sheet disclosed in the present application at a third viewing angle;

[0044] Fig.10 is a schematic structural diagram of the cover sheet disclosed in the present application at a fourth viewing angle;

[0045] Fig.11 It is a schematic structural diagram of the cover sheet disclosed in the present application at a second viewing angle;

[0046] Fig.12 for Fig.11 Enlarged schematic diagram of the middle III region;

[0047] Fig.13 This is a logo diagram of the cover sheet disclosed in the present application at a fifth viewing angle;

[0048] Fig.14 This is a logo diagram of the cover sheet disclosed in the present application at a sixth viewing angle;

[0049] Fig.15 It is a logo diagram of the cover sheet disclosed in the present application at a second viewing angle;

[0050] Fig.16 for Fig.15 Enlarged schematic diagram of the middle IV region;

[0051] Fig.17 This is a schematic diagram of the structure of the insulating sheet disclosed in this application;

[0052] Fig.18 This is a schematic diagram of the structure of the second battery disclosed in this application;

[0053] Fig.19 This is a schematic diagram of the explosion structure of the third battery disclosed in this application;

[0054] Fig. 20 This is a schematic diagram of the shape of the weld cross section disclosed in this application.

[0055] The above drawings include the following reference numerals:

[0056] 10. Cover body; 11. Cover sheet; 12. Insulating sheet; 13. Positive conductive block; 14. Positive column; 15. Negative conductive block; 16. Negative column; 17. Top cover patch; 20. Bottom shell; 21. First groove; 30. Battery core; 40. Outer film; 41. Flanged portion; 42. Main body; 50. Annular groove; 60. Weld; 111. First surface; 112. Third groove; 113. First recessed portion; 114. Step; 115. External flange; 121. Upper surface of insulating sheet; 122. Second recessed portion; 123. Second groove; 1121. First side wall; 1122. First transition surface; 1131. First bottom surface; 1132. Third transition surface; 1141. First step surface; 1142. Second step surface; 1221. Second transition surface. DETAILED DESCRIPTION

[0057] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0058] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0059] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0060] See also Figures 1 to 8 As shown, according to an embodiment of the present application, a battery is provided, which includes a housing assembly, a battery cell 30 and an outer envelope 40 .

[0061] The housing assembly includes a bottom shell 20 and a cover 10, wherein the bottom shell 20 has a first groove 21, and the cover 10 is covered on the bottom shell 20 and surrounded by the first groove 21 to form an installation cavity, and a first recessed portion 113 is provided on the periphery of the cover 10, and the first recessed portion 113 is recessed along the surface of the cover 10 away from the bottom shell 20 toward the direction close to the bottom shell 20, and the bottom shell 20 is located at the bottom of the cover 10, and the bottom shell 20 is welded with the cover 10 to form a weld 60, and the weld 60 is located on the peripheral side wall of the battery and is lower than the bottom surface of the first recessed portion 113. The battery cell 30 is arranged in the installation cavity. The outer film 40 includes a main body 42 and a flange portion 41, wherein the main body 42 is coated on the outer surface of the bottom shell 20, and the flange portion 41 is arranged on the side of the main body 42 close to the cover 10 and extends to cover the bottom surface of the first recessed portion 113.

[0062] Compared with the prior art, in the present embodiment, a first recessed portion 113 is provided on the cover body 10 of the battery, and the bottom shell 20 is connected to the cover body 10 by welding. The weld 60 is not higher than the bottom surface of the first recessed portion 113, and the bottom surface of the first recessed portion 113 is covered with the flange portion 41 of the outer film 40. In the present embodiment, the provision of the first recessed portion 113 facilitates the provision of the flange portion 41 in the first recessed portion 113, which means that the flange portion 41 will not protrude too much from the surface of the cover body 10 away from the bottom shell 20, and the proportion of the overall volume of the battery occupied by the cover body 10 and the flange portion 41 is reduced. At the same time, the weld 60 does not protrude from the bottom surface of the first recessed portion 113, so that the flange portion 41 can be arranged in close contact with the bottom surface of the first recessed portion 113, avoiding the flange portion 41 protruding from the bottom surface of the first recessed portion 113 due to the weld, so that the battery in the first direction (such as the attached Figure 3 The height (in the Z direction) of the battery is too large, and the cover 10 and the outer film 40 account for too large a proportion of the overall volume of the battery, resulting in a problem of low space utilization of the battery.

[0063] In this embodiment, if the flange portion 41 protrudes from the surface of the cover 10 away from the first groove 21, the thickness of the battery in the first direction will be too high, and the flange portion 41 and the cover 10 will occupy too much volume of the battery, resulting in low space utilization of the battery and low battery capacity. Therefore, in order to increase the space utilization of the battery, the surface of the flange portion 41 away from the main body 42 is lower than the surface of the cover 10 away from the first groove 21. In some specific embodiments, the thickness of the flange portion 41 can be set lower or the depression depth of the first depression 113 can be set higher.

[0064] Furthermore, a second groove 123 is provided on the side of the cover body 10 close to the first groove 21 . The second groove 123 is recessed in a direction away from the bottom shell 20 and a mounting cavity is formed by surrounding the second groove 123 .

[0065] Compared with the prior art, the cover 10 of this embodiment is provided with a second groove 123, and the second groove 123 can provide a certain installation space for the battery cell 30. This means that when the size of the bottom shell 20 is fixed, the volume of the battery cell 30 can be made larger, thereby increasing the capacity of the battery. In addition, compared with the prior art, the overall volume of the cover 10 of this embodiment is smaller, which will not cause too much problem of reduced battery space utilization.

[0066] Furthermore, the cover body 10 includes a cover sheet 11 and an insulating sheet 12. The insulating sheet 12 is laid on a side of the cover sheet 11 close to the first groove 21, and a second groove 123 is provided on a side of the insulating sheet 12 away from the cover sheet 11, and at least a portion of the insulating sheet 12 provided with the second groove 123 is embedded in the third groove 112.

[0067] Specifically, by providing the third groove 112 on the cover sheet 11, and at least the portion of the insulating sheet 12 provided with the second groove 123 is embedded in the third groove 112, that is, by nesting, the overall thickness of the cover body 10 is reduced, thereby reducing the volume share of the cover body 10 in the battery. The arrangement of this embodiment can increase the volume of the battery cell 30 as much as possible without changing the volume of the battery, thereby further improving the battery capacity and maximizing the battery space utilization.

[0068] As attached Figures 9 to 16 As shown, the cover plate 11 also includes an outer flange 115, which extends in the inner and outer directions of the cover plate 11, and a first side wall 1121 is provided around the outer periphery of the third groove. A step 114 is provided between the outer flange 115 and the outer side wall of the third groove 112, and the end surface of the bottom shell 20 overlaps the step 114, and the outer flange 115 and the bottom shell 20 are welded by a weld 60.

[0069] In this embodiment, as shown in the attached Fig.13 As shown, the inner and outer directions of the cover sheet 11 refer to the projection plane of the cover sheet 11 in the first direction, and the direction from the inner center of the cover sheet 11 to the outer edge of the cover sheet 11 is perpendicular. By setting the outer flange 115 on the cover sheet 11, the outer flange 115 of the cover sheet 11 is partially overlapped on the bottom shell 20, thereby avoiding that the cover sheet 11 occupies too much space in the first groove 21 when the cover sheet 11 and the bottom shell 20 are installed, resulting in less installation space reserved for the battery cell 30. In addition, the provision of the outer flange 115 can also enable the cover sheet 11 to be welded to the bottom shell 20 by side welding, that is, welding is performed along the direction from the side wall of the bottom shell 20 to the cover sheet 11. This welding method can avoid that the weld 60 protrudes from the welding position along the first direction during welding, thereby causing the weld 60 to occupy a certain installation space of the battery cell 30, so that the battery space utilization rate is reduced.

[0070] As attached Fig.12As shown, a first recessed portion 113 is provided along the outer periphery of the surface of the cover sheet 11 facing away from the bottom shell 20 . The first recessed portion 113 is recessed along the surface of the cover sheet 11 facing away from the bottom shell 20 toward the bottom shell 20 . The first recessed portion has a first bottom surface 1131 .

[0071] Specifically, the first recessed portion 113 can reduce the volume of the cover sheet 11. Secondly, the first recessed portion 113 can enable the outer flange 115 to be disposed on the side of the cover sheet 11 close to the first groove 21, so that a smaller portion of the cover body 10 falls into the first groove 21, thereby preventing the cover sheet 11 from occupying too much space in the first groove 21, resulting in a size restriction of the battery cell 30. It is worth mentioning that in some other embodiments, such as the attached Fig.18 As shown, the cover sheet 11 is not provided with the first recessed portion 113 , but an annular groove 50 is provided to reduce the volume and weight of the cover sheet 11 .

[0072] Furthermore, the first recessed portion 113 is disposed along the second direction (such as the Figure 3 The length L2 of the first bottom surface 1131 along the inner and outer directions of the cover body 10, the length H3 of the first bottom surface 1131 along the inner and outer directions of the cover body 10, and the length L0 of the cover body 10 along the second direction satisfy the relationship: 5mm≤L2+H3≤L0-0.2mm≤1m. It should be noted that in this embodiment, the value of H3 is relatively small, that is, the values ​​of L2 and L0 are close, and 0.2mm is a reserved value of H3 to avoid H3 taking a value of 0. When L0 and the sum of L2 and H3 meet the above range, the cover body 10 will not be too long to increase the manufacturing cost of the battery too much, nor will the length of the cover sheet 11 be too short to result in a lower battery capacity. The value of L0 can be 7mm, 100mm, 200mm, 300mm, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm and 1002mm.

[0073] Preferably, the length L2 of the first recessed portion 113 along the second direction, the length H3 of the first bottom surface 1131 along the inner and outer directions of the cover body 10, and the length L0 of the cover body 10 along the second direction satisfy the relationship: 10mm≤L2+H3≤L0-0.2mm≤1m. When L0 and the sum of L2 and H3 are within this range, the manufactured battery has wide versatility. For example, the manufactured small-sized battery can be used for mobile phone batteries, watch batteries or laptop batteries; the manufactured large-sized battery can be used in electric vehicles or other larger equipment. The preferred values ​​of L0 include: 12mm, 100mm, 200mm, 300mm, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm and 1002mm

[0074] Furthermore, the first recessed portion 113 is disposed along the third direction (eg, Figure 3 The width W2 of the first bottom surface 1131 along the inner and outer directions of the cover body 10, the length H3 of the first bottom surface 1131 along the inner and outer directions of the cover body 10, and the width W0 of the cover body 10 along the second direction satisfy the relationship: 5mm≤W2+H3≤W0-0.2mm≤1m. Similarly, when W0 satisfies the above relationship, the width of the cover sheet 11 will not be too large, resulting in low versatility and high cost of the manufactured battery. In this range, the width of the battery will not be too narrow, resulting in a lower overall capacity of the battery. The value of W0 can be 7mm, 100mm, 200mm, 300mm, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm and 1002mm.

[0075] Preferably, the width W2 of the first recessed portion 113 along the third direction, the length H3 of the first bottom surface 1131 along the inner and outer directions of the cover sheet 11, and the width W0 of the cover sheet 11 along the second direction satisfy the relationship: 10mm≤W2+H3≤W0-0.2mm≤1m. Similarly, when W0 and the sum of W2 and H3 satisfy the above range, the manufactured battery is more versatile. Preferred values ​​of W0 include: 12mm, 100mm, 200mm, 300mm, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm and 1002mm

[0076] Furthermore, along the first direction, the maximum depth T4 of the first recessed portion 113 satisfies the relationship: 0≤T4≤20mm. When T4 satisfies the above range, the first recessed portion 113 can effectively reduce the overall volume of the cover sheet 11, and will not make the strength of the cover sheet 11 too low, causing the battery to be prone to safety hazards. The value of T4 can be 0mm, 2mm, 4mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm and 200mm. When T4 is greater than 20mm, the setting of the first recessed portion 113 makes the structural strength of the cover sheet 11 too low, which easily causes the cover sheet 11 to be damaged when the battery is bumped.

[0077] Preferably, along the first direction, the maximum depth T4 of the first recessed portion 113 satisfies the relationship: 0≤T4≤5mm. When T4 satisfies the above range, the cover sheet 11 can effectively improve the space utilization of the battery and increase the capacity of the battery without causing the overall strength of the cover sheet 11 to be too low, causing safety hazards to the battery. The preferred values ​​of T4 are 0, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm and 5mm.

[0078] Furthermore, along the second direction, the length L3 of the cover sheet 11 and the length L1 of the first side wall 1121 , and the distance H2 between the outer edge of the outer flange 115 and the outer surface of the first side wall 1121 satisfy the relationship: 5mm≤L1+H2≤L3-0.2mm≤1m.

[0079] It should be noted that in the above relationship, 0.2 mm is a reserved value of H2. When the value of H2 is not fixed, at least the distance between the outer edge of the flange and the outer surface of the first side wall 1121 is guaranteed to be 0.2 mm. When the value of L1 meets the above range, the size of the third groove 112 in the second direction is larger, and the insulating sheet 12 can be better nested. In addition, when the value of H2 is close to 0, the value of L1 is close to the value of L3. At this time, the size of the third groove 112 in the second direction is the largest, and the space utilization rate of the battery is higher.

[0080] Preferably, along the second direction, the length L3 of the cover sheet 11 and the length L1 of the first side wall 1121 , and the distance H2 between the outer edge of the outer flange 115 and the outer surface of the first side wall 1121 satisfy the relationship: 10mm≤L1+H2≤L3-0.2mm≤1m.

[0081] Furthermore, along the third direction, the width W3 of the cover sheet 11 and the width W1 of the first side wall 1121, as well as the distance H2 between the outer edge of the outer flange 115 and the outer surface of the first side wall 1121 satisfy the relationship: 5mm≤W1+H2≤W3-0.2mm≤1m. Similarly, when the value of W1 satisfies the above range, the size of the third groove 112 in the third direction is larger, which can effectively improve the space utilization of the battery.

[0082] Preferably, along the third direction, the width W3 of the cover plate 11 and the width W1 of the first side wall 1121 , and the distance H2 between the outer edge of the outer flange 115 and the outer surface of the first side wall 1121 satisfy the relationship: 10mm≤W1+H2≤W3-0.2mm≤1m.

[0083] It should be noted that the length L0 of the cover body 10 along the second direction is the same as the length L3 of the cover sheet 11 along the third direction, and the width W0 of the cover body 10 along the third direction is the same as the width W3 of the cover sheet 11 along the third direction.

[0084] Furthermore, along the first direction, the thickness T0 of the cover sheet 11, the height T1 of the first side wall 1121, the thickness T2 of the outer flange 115 and the depth T3 of the third groove 112 satisfy the relationship: 0.5mm≤T1≤T3≤50mm, 0.3mm≤T2≤T0≤10mm.

[0085] Specifically, the values ​​of T1 and T3 can be 0.5mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm and 50mm. When T1 meets the above range, the first side wall 1121 has a certain height and can provide a certain support force for the insulating sheet 12 installed in the third groove 112 to prevent the insulating sheet 12 from separating from the cover sheet 11. When T3 meets the above range, the third groove 112 has a certain accommodation space, which can accommodate the insulating sheet 12, thereby reducing the overall volume of the cover body 10 and improving the space utilization of the battery. The values ​​of T2 and T0 can be 0.3mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm and 10mm. When T2 meets the above value, the outer flange 115 has a certain thickness and strength, and can overlap on the side wall of the bottom shell 20. When T0 satisfies the above value, the thickness of the cover sheet 11 will not be too thick, resulting in low battery space utilization, and the thickness of the cover sheet 11 will not be too thin, resulting in low structural strength of the cover sheet 11 and easy damage.

[0086] Preferably, along the first direction, the thickness T0 of the cover sheet 11, the height T1 of the first side wall 1121, the thickness T2 of the outer flange 115 and the depth T3 of the third groove 112 satisfy the relationship: 0.6mm≤T1≤T3≤10mm, 0.5mm≤T2≤T0≤5mm.

[0087] In this embodiment, the preferred values ​​of T1 and T3 are 0.6 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm and 10 mm. The preferred values ​​of T2 and T0 are 0.5 mm, 1 mm, 1.5 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm and 10 mm.

[0088] Further, the distance H2 between the outer edge of the outer flange 115 and the outer surface of the first side wall 1121 satisfies the relationship: 0.1mm≤H2≤25mm. When the value of H2 is within the above range, the step 114 between the outer flange 115 and the third groove 112 has a certain width, that is, the step 114 can overlap the side wall surface of the bottom shell 20. The value of H2 can be 0.1mm, 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm and 25mm.

[0089] Preferably, the distance H2 between the outer edge of the outer flange 115 and the outer surface of the first side wall 1121 satisfies the relationship: 0.3mm≤H2≤3mm. When the value of H2 is within the above range, the width of the step 114 will not be too large, that is, the width of the step 114 will not be much larger than the thickness of the side wall of the bottom shell 20, thereby causing a large gap between the step 114 and the side wall of the bottom shell 20, reducing the space utilization of the battery. The preferred value of H2 can be 0.3mm, 0.5mm, 0.8mm, 1mm, 1.3mm, 1.5mm, 1.8mm, 2mm, 2.3mm, 2.5mm, 2.8mm and 3mm.

[0090] As attached Fig.17 As shown, the outer periphery of the insulating sheet 12 is provided with a second recessed portion 122 opposite to the first side wall 1121. In the inner and outer directions of the insulating sheet 12, the width H5 of the bottom surface of the second recessed portion 122 and the thickness H1 of the first side wall 1121 satisfy the relationship 0≤H5-H1≤10mm.

[0091] Specifically, the inner and outer directions of the insulating sheet 12 refer to the direction of the tangent line perpendicular to the outer edge of the insulating sheet 12 from the inside of the insulating sheet 12 in the projection plane of the insulating sheet 12 in the first direction. The difference between H1 and H5 should be as small as possible to avoid that after the insulating sheet 12 and the cover sheet 11 are assembled, there is a certain gap between the second recessed portion 122 and the first side wall 1121 when the first side wall 1121 and the second recessed portion 122 are overlapped, resulting in a large amount of vacant space in the bottom shell 20, thereby making the space utilization rate of the battery too low. The difference between H5 and H1 can be 0, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm. It is worth noting that in other embodiments, the value of H5 can be greater than H1 or less than H1. In this embodiment, the value of H5 is greater than the value of H1.

[0092] Preferably, along the direction from the inside of the cover sheet 11 to the outside of the cover sheet 11, the width H5 of the second recessed portion 122 and the thickness H1 of the first side wall 1121 satisfy the relationship 0≤H5-H1≤1mm. The preferred value of the difference between H5 and H1 can be 0, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm and 1mm.

[0093] In order to adapt the assembly of the insulating sheet 12 and the cover sheet 11, along the first direction, the maximum depth T5 of the second recessed portion 122 and the maximum depth T3 of the third groove 112 satisfy the relationship: 0≤T5-T3≤10mm. When the difference between T5 and T3 satisfies the above relationship, the insulating sheet 12 and the cover sheet 11 will not cause the overall thickness of the cover body 10 to be excessive after assembly, thereby affecting the space utilization rate and capacity of the battery. The difference between T5 and T3 can be 0, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm and 10mm.

[0094] Preferably, along the first direction, the maximum depth T5 of the second recessed portion 122 and the maximum depth T3 of the third groove 112 satisfy the relationship: 0≤T5-T3≤1mm. The preferred value of the difference between T5 and T3 is 0, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm and 1mm.

[0095] Optionally, along the second direction, the length L1 of the first side wall 1121 and the length L5 of the second recessed portion 122 satisfy the relationship: 0≤L1-L5≤2mm.

[0096] Specifically, the length L1 of the first side wall 1121 and the length L5 of the second recessed portion 122 should be nearly consistent, so that after the insulating sheet 12 and the cover sheet 11 are assembled, there will not be too much empty space in the first groove 21. The difference between L1 and L5 can be 0, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm and 2mm.

[0097] Preferably, along the second direction, the length L1 of the first side wall 1121 and the length L5 of the second recessed portion 122 satisfy the relationship: 0≤L1-L5≤1mm. Preferred values ​​of the difference between L1 and L5 include 0, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm and 1mm.

[0098] Similarly, in order to avoid excessive vacant gaps in the first groove 21 in the third direction after the insulating sheet 12 and the cover sheet 11 are assembled, along the third direction, the width W1 of the first side wall 1121 and the width W5 of the second recessed portion 122 satisfy the relationship: 0≤W1-W5≤2mm, and the difference between W1 and W5 can be 0, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm and 2mm.

[0099] Preferably, along the third direction, the width W1 of the first side wall 1121 and the width W5 of the second recessed portion 122 satisfy the relationship: 0≤W1-W5≤1mm. Preferred values ​​of the difference between W1 and W5 include 0, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm and 1mm.

[0100] Optionally, along the first direction, the maximum depth T5 of the second recessed portion 122 satisfies the relationship: 0≤T5≤20mm. Specifically, when T5 satisfies the above relationship, the depth of the second recessed portion 122 will not be too large, resulting in too low structural strength of the second recessed portion 122, thereby causing damage to the insulating sheet 12. The value of T5 can be 0, 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm and 20mm.

[0101] Preferably, along the first direction, the maximum depth T5 of the second recessed portion 122 satisfies the relationship: 0≤T5≤5mm. Preferred values ​​of T5 may be 0, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm and 5mm.

[0102] Furthermore, along the outer circumferential direction of the cover plate 11 , a distance H2 between the outer edge of the outer flange 115 and the outer surface of the first side wall 1121 remains constant.

[0103] In this embodiment, the shape of the projection of the cover sheet 11 along the first direction can be a circle, an ellipse, a quadrilateral, a triangle, or a hexagon, and the projection surface of the outer flange 115 in the first direction can be a corresponding circular ring, an elliptical ring, a quadrilateral ring, a triangular ring, or a hexagonal ring. Similarly, the structure of the bottom shell 20 can be set to a corresponding cylindrical structure, an elliptical cylindrical structure, a quadrilateral prism structure, a triangular prism structure, or a hexagonal prism structure. In this embodiment, the distance H2 between the outer edge of the outer flange 115 at each location of the cover sheet 11 and the outer surface of the first side wall 1121 is the same, which facilitates the production of the cover sheet 11 and reduces the production difficulty.

[0104] Optionally, the shape of the projection surface of the cover plate 11 in the first direction is a quadrilateral, and the shape of the projection surface of the outer flange 115 in the first direction is a quadrilateral ring. Along the inward and outward directions of the cover plate 11, the distances H2 between the outer edges of the outer flanges 115 opposite to each other on each side of the cover plate 11 and the outer surface of the first side wall 1121 are not the same, or the distances H2 between the outer edges of the outer flanges 115 opposite to each other on at least two sides and the outer surface of the first side wall 1121 are the same.

[0105] Furthermore, the thickness Tk of the side wall of the bottom shell 20 and the distance H2 between the outer edge of the outer flange 115 and the outer surface of the first side wall 1121 both satisfy the relationship: 0.2mm≤Tk≤H2-0.3mm≤3.5mm. In this embodiment, 0.3mm is a reserved value to prevent the side wall of the bottom shell 20 from hitting the step 114, which may cause the cover body 10 to be easily damaged. When Tk meets the above range, a large gap between the bottom shell 20 and the step 114 can be avoided, while ensuring the rigidity of the side wall of the bottom shell 20. The value of Tk can be 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm and 3.5mm

[0106] Preferably, the thickness Tk of the side wall of the bottom shell 20 and the distance H2 between the outer edge of the outer flange 115 and the outer surface of the first side wall 1121 both satisfy the relationship: 0.35mm≤Tk≤H2-0.3mm≤1.5mm. The preferred value of Tk can be 0.35mm, 0.5mm, 0.65mm, 0.8mm, 1mm, 1.1mm, 1.35mm, 1.5mm.

[0107] As attached Fig. 20 As shown, the cross-sectional area of ​​the weld 60 has a shape of at least one of a semicircle, an acute triangle, a trapezoid, a double-peak shape, and a columnar shape.

[0108] Specifically, when the cross-sectional area of ​​the weld 60 is in the shape of a semicircle, an acute triangle, a trapezoid, a double wave peak or a column, the welding process is simple and convenient for manufacturing the battery. At the same time, when the weld 60 is in the above shape, the welding area between the bottom shell 20 and the cover sheet 11 is large, and the stability of the battery is high.

[0109] Further, along the first direction, the maximum weld width M1 of the weld 60 satisfies the relationship: 0.3mm≤M1≤5mm. It should be noted that the present embodiment adopts side welding for welding, that is, welding is performed along the outer side wall of the bottom shell 20 toward the cover sheet 11. In the present embodiment, when the maximum weld width M1 of the weld 60 satisfies the above relationship, the welding strength between the bottom shell 20 and the cover sheet 11 is high, and the weld 60 will not be too wide, causing the weld 60 to protrude from the side wall surface of the bottom shell 20 or the surface of the outer flange 115, thereby reducing the battery space utilization. The value of M1 can be 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm and 5mm.

[0110] To ensure the welding strength between the bottom shell 20 and the cover plate 11, preferably, along the first direction, the maximum weld width M1 of the weld 60 satisfies the relationship: 0.5mm≤M1≤5mm. Preferred values ​​of M1 include 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm and 5mm.

[0111] Furthermore, along the inner and outer directions of the cover body 10, the maximum penetration depth D1 of the weld 60 satisfies the relationship: 0.3mm≤D1≤10mm. Similarly, the inner and outer directions of the cover body 10 are consistent with the inner and outer directions of the cover sheet 11. When the maximum penetration depth D1 of the weld 60 satisfies the above relationship, the welding strength between the bottom shell 20 and the cover body 10 is high, and the penetration depth of the weld 60 will not be too large, causing the weld 60 to reduce the structural strength of the cover body 10. The value of D1 can be 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm and 5mm.

[0112] Preferably, along the inner and outer directions of the cover body 10, the maximum penetration depth D1 of the weld 60 satisfies the relationship: 0.5 mm ≤ D1 ≤ 3 mm. When D1 satisfies the above relationship, the welding strength between the bottom shell 20 and the cover body 10 can be further improved. The preferred values ​​of D1 include 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm and 5 mm.

[0113] Furthermore, the cover body 10 is provided with a first surface 111 along a side away from the first groove 21 , and along the first direction, a minimum spacing H between the welding seam 60 and the first surface 111 satisfies the relationship: 0.1 mm≤H≤5 mm.

[0114] Specifically, if H>5mm, the structural strength of the cover sheet 11 will be reduced. When H<0.1mm, the welding strength between the cover sheet 11 and the bottom shell 20 is low. When H satisfies the relationship: 0.1mm≤H≤5mm, the weld 60 will not cause the structural strength of the cover sheet 11 to decrease, and the welding strength between the cover sheet 11 and the bottom shell 20 is high. The value of H can be 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm and 5mm.

[0115] Preferably, along the first direction, the minimum spacing H between the weld 60 and the first surface 111 satisfies the relationship: 0.2 mm ≤ H ≤ 2 mm. Preferred values ​​of H include 0.2 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm and 5 mm.

[0116] Furthermore, along the first direction, the projection area S1 of the first side wall 1121, the projection area S2 of the bottom of the third groove 112, and the cross-sectional area S3 of the outer flange 115 assembled on the side wall of the bottom shell 20 along the inner and outer directions of the cover sheet 11 satisfy the relationship: 150mm 2 ≤S1≤S3≤S2≤1m 2 , 0.015<S1 / S2<0.3, 1≤S2 / S3≤1.5.

[0117] Specifically, the values ​​of S1, S2 and S3 include 150 mm 2 , 500mm 2 , 1000mm 2 、1500mm 2 , 2000mm 2 , 2500mm 2 、3000mm 2 、3500mm 2 , 4000mm 2 、4500mm 2 , 5000mm 2 、5500mm 2 、6000mm 2 、6500mm 2 、7000mm 2 、7500mm 2 , 8000mm 2 、8500mm 2 , 9000mm 2 、9500mm 2 and 10000mm 2 When S2 is larger, for example, 9000mm 2 or 10000mm 2 , the battery is larger in size and can be used in devices such as electric vehicles. When S2 is smaller, for example 150mm 2 When the battery is small in size, it can power small instruments. Secondly, when the ratio of S1 to S2 satisfies the relationship 0.015<S1 / S2<0.3, the area of ​​the third groove 112 is large, which is convenient for the assembly of the insulating sheet 12 and the cover sheet 11. The ratio of S1 to S2 can be 0.02, 0.05, 0.1, 0.15, 0.2, 0.25 and 0.28. When S2 and S3 satisfy the relationship 1≤S2 / S3≤1.5, the area of ​​the bottom shell 20 and the cover sheet 11 for assembly is large, that is, the area available for welding is large, so as to improve the welding strength between the cover sheet 11 and the bottom shell 20. The ratio of S2 to S3 can be 1, 1.1, 1.2, 1.3, 1.4 and 1.5.

[0118] Preferably, along the first direction, the projection area S1 of the first side wall 1121, the projection area S2 of the bottom of the third groove 112, and the cross-sectional area S3 of the outer flange 115 assembled on the side wall of the bottom shell 20 along the inner direction of the cover sheet 11 to the inner and outer directions of the cover sheet 11 satisfy the relationship: 3000mm 2 ≤S1≤S3≤S2≤50000mm 2 , 0.01<S1 / S2<0.2,1≤S2 / S3≤1.2. The preferred value of S1 includes 3000mm 2 、3200mm 2 、3400mm 2 、3600mm 2 、3800mm 2 , 4000mm 2 、4200mm 2 、4400mm 2 、4600mm 2 、4800mm 2 and 5000mm 2 Preferred values ​​of the ratio of S1 to S2 include 0.011, 0.012, 0.013, 0.014, 0.015, 0.016, 0.017, 0.018 and 0.019. Preferred values ​​of the ratio of S2 to S3 include 1, 1.02, 1.04, 1.06, 1.08, 1.1, 1.12, 1.14, 1.16, 1.18 and 1.2.

[0119] Furthermore, along the first direction, the thickness Tm of the flange portion 41 of the outer film 40 and the maximum depth T4 of the first recessed portion 113 satisfy the relationship: 0.05mm≤Tm≤T4≤20mm. In addition, a top cover patch 17 is provided at the top of the cover sheet 11 to improve the protectiveness of the cover sheet 11.

[0120] Specifically, compared to the prior art, the flange portion 41 of the outer film 40 of this embodiment is arranged on the first recessed portion 113, and the height of the first end does not protrude from the first surface 111, which means that the outer film 40 is arranged in the first recessed portion 113, and does not cause the volume of the battery to increase in the height direction. In addition, when T4 and Tm satisfy the above relationship, the outer film 40 can have a good insulation effect, and the outer film 40 will not increase the overall volume of the battery too much. The values ​​of T4 and Tm can be 0.05mm, 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm and 20mm.

[0121] In order to avoid the first concave portion 113 being too deep, resulting in a decrease in the structural strength of the cover sheet 11 and an over-thickness of the outer film 40. Preferably, along the first direction, the thickness Tm of the flange portion 41 of the outer film 40 and the maximum depth T4 of the first concave portion 113 satisfy the relationship: 0.05mm≤Tm≤T4≤5mm. Preferred values ​​of Tm and T4 include 0.05mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm and 5mm.

[0122] Further, the cover sheet 11 includes an aluminum cover sheet 11, a stainless steel cover sheet 11, a copper cover sheet 11, a steel-aluminum cover sheet 11, and a copper-aluminum cover sheet 11. The housing includes an aluminum housing, a stainless steel housing, a copper housing, a steel-aluminum housing, and a copper-aluminum housing. In this embodiment, the cover sheet 11 is a stainless steel cover sheet 11, and the bottom shell 20 is a stainless steel housing, which is easy to process and has low cost. In this embodiment, the insulating sheet 12 includes a plastic insulating sheet 12.

[0123] Further, the insulating sheet includes a second surface away from the first groove 21. The third groove 112 also includes a first transition surface 1122, which is arranged between the bottom surface of the third groove 112 and the first side wall 1121, and the second recessed portion 122 also includes a second transition surface 1221 adapted to the first transition surface 1122, and the second transition surface 1221 is arranged between the second surface and the bottom surface of the second recessed portion 122. The first recessed portion 113 also includes a third transition surface 1132, which is arranged between the first bottom surface 1131 and the first surface 111.

[0124] Specifically, the first transition surface 1122 and the second transition surface 1221 can prevent the insulating sheet 12 and the cover sheet 11 from colliding at the top corners during assembly, thereby preventing the insulating sheet 12 from damaging the cover sheet 11. The third transition surface 1132 is used to reduce the stress at the corner between the first surface 111 and the first recessed portion 113, thereby preventing the cover sheet 11 from being damaged due to excessive stress at the corner when the cover sheet 11 collides.

[0125] Further, the step 114 includes a first step surface 1141 and a second step surface 1142, the first step surface 1141 is an outer surface of the outer flange 115, the second step surface 1142 is a surface of the first side wall 1121, and the angle C between the first step surface 1141 and the second step surface 1142 satisfies the relationship: 85°≤C≤95°. When the angle C between the first step surface 1141 and the second step surface 1142 is too large or too small, that is, when C>95° or C<85°, a large inclined gap will appear between the cover sheet 11 and the bottom shell 20 during welding, which reduces the space utilization of the battery and also reduces the welding strength of the welding point. The value of C can be 85°, 86°, 87°, 88°, 89°, 90°, 91°, 92°, 93°, 94° and 95°. Preferably, the value of C is 90°.

[0126] In addition, if attached Figure 8 As shown, in this embodiment, the cover sheet 11 is also provided with a positive electrode connection hole and a negative electrode connection hole, in which a positive electrode conductive block 13 is provided, and in which a negative electrode conductive block 15 is provided. The insulating sheet 12 is provided with corresponding through holes corresponding to the positive electrode connection hole and the negative electrode connection hole of the cover sheet 11, in which positive electrode posts 14 and negative electrode posts 16 are respectively provided, and the positive electrode posts 14 and negative electrode posts 16 are connected to the tab assembly of the battery cell 30. In some other embodiments, as shown in the attached Fig.19 As shown, the above-mentioned cover body 10 structure is disposed on both the upper and lower sides of the bottom shell 20 .

[0127] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0128] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0129] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery, characterized in that: include: A shell assembly, the shell assembly comprising a bottom shell (20) and a cover body (10), the bottom shell (20) having a first groove (21), the cover body (10) being covered on the bottom shell (20) and surrounding the first groove (21) to form a mounting cavity, the outer periphery of the cover body being provided with a first recessed portion (113), the first recessed portion (113) being recessed along a surface of the cover body away from the bottom shell (20) toward a direction close to the bottom shell (20), and the bottom shell (20) being located at the bottom of the cover body (10), the bottom shell (20) and the cover body (10) being welded to form a weld (60), the weld (60) being located on the outer peripheral side wall of the battery and lower than the bottom surface of the first recessed portion (113); A battery core (30), the battery core (30) being arranged in the installation cavity; The outer membrane comprises a main body (42) and a flange portion (41), wherein the main body (42) is coated on the outer surface of the bottom shell (20), and the flange portion (41) is arranged on a side of the main body (42) close to the cover body (10) and extends to cover the bottom surface of the first recessed portion (113).

2. The battery according to claim 1, characterized in that The surface of the flange portion (41) facing away from the main body portion (42) is lower than the surface of the cover body (10) facing away from the first groove (21).

3. The battery according to claim 1, characterized in that Along the first direction, the thickness Tm of the flange portion (41) and the maximum depth T4 of the first recessed portion (113) satisfy the relationship: 0.05 mm ≤ Tm ≤ T4 ≤ 20 mm.

4. The battery according to claim 1, characterized in that Along the first direction, the maximum weld width M1 of the weld (60) satisfies the relationship: 0.3 mm ≤ M1 ≤ 5 mm; and / or, Along the inner and outer directions of the cover body (10), the maximum penetration depth D1 of the weld (60) satisfies the relationship: 0.3 mm ≤ D1 ≤ 10 mm; and / or, A first surface (111) is provided on a side of the cover body facing away from the bottom shell, and along a first direction, a minimum spacing H between the welding seam (60) and the first surface (111) satisfies the relationship: 0.1 mm ≤ H ≤ 5 mm.

5. The battery according to claim 1, characterized in that The first recessed portion comprises a first bottom surface (1131), a length L2 of the first recessed portion (113) along the second direction, a length H3 of the first bottom surface (1131) along the inner and outer directions of the cover body (10), and a length L0 of the cover body (10) along the second direction satisfy the relationship: 5mm≤L2+H3≤L0-0.2mm≤1m; and / or, The width W2 of the first recessed portion (113) along the third direction, the length H3 of the first bottom surface (1131) along the inner and outer directions of the cover body (10), and the width W0 of the cover body (10) along the second direction satisfy the relationship: 5mm≤W2+H3≤W0-0.2mm≤1m; and / or, Along the first direction, the maximum depth T4 of the first recessed portion (113) satisfies the relationship: 0≤T4≤20mm.

6. The battery according to claim 1, characterized in that The cover body (10) comprises: A cover plate (11), wherein a third groove (112) is provided on a side of the cover plate (11) close to the first groove (21), and the third groove (112) is recessed in a direction away from the bottom shell (20); An insulating sheet (12), the insulating sheet (12) being laid on a side of the cover sheet (11) close to the first groove (21), and a second groove (123) being provided on a side of the insulating sheet (12) facing away from the cover sheet (11), and at least a portion of the insulating sheet (12) provided with the second groove (123) being embedded in the third groove (112).

7. The battery according to claim 6, characterized in that The cover plate (11) further comprises an outer flange (115), the outer flange (115) extending in the inner and outer directions of the cover plate (11), a first side wall (1121) being provided on the outer periphery of the third groove, a step (114) being provided between the outer flange (115) and the first side wall (1121), an end surface of the bottom shell (20) being overlapped on the step (114), and the outer flange (115) and the bottom shell (20) being welded via a weld (60).

8. The battery according to claim 7, characterized in that Along the second direction, the length L3 of the cover sheet (11) and the length L1 of the first side wall (1121), and the distance H2 between the outer edge of the outer flange (115) and the outer surface of the first side wall (1121) satisfy the relationship: 5mm≤L1+H2≤L3-0.2mm≤1m; and / or, Along the third direction, the width W3 of the cover sheet (11) and the width W1 of the first side wall (1121), and the distance H2 between the outer edge of the outer flange (115) and the outer surface of the first side wall (1121) satisfy the relationship: 5mm≤W1+H2≤W3-0.2mm≤1m; and / or, Along the first direction, the thickness T0 of the cover sheet (11), the height T1 of the first side wall (1121), the thickness T2 of the outer flange (115), and the depth T3 of the third groove (112) satisfy the relationship: 0.5 mm ≤ T1 ≤ T3 ≤ 50 mm, 0.3 mm ≤ T2 ≤ T0 ≤ 10 mm; and / or, A distance H2 between the outer edge of the outer flange (115) and the outer surface of the first side wall (1121) satisfies the relationship: 0.1 mm ≤ H2 ≤ 25 mm.

9. The battery according to claim 7, characterized in that The outer periphery of the insulating sheet (12) is provided with a second recessed portion (122) opposite to the first side wall (1121); Wherein, along the inner and outer directions of the insulating sheet (12), the width H5 of the bottom surface of the second recessed portion (122) and the thickness H1 of the side wall of the third groove (112) satisfy the relationship 0≤H5-H1≤10mm; and / or, Along the first direction, the maximum depth T5 of the second recessed portion (122) and the maximum depth T3 of the third groove (112) satisfy the relationship: 0≤T5-T3≤10mm; and / or, Along the second direction, the length L1 of the first side wall (1121) and the length L5 of the second recessed portion (122) satisfy the relationship: 0≤L1-L5≤2mm; and / or, Along the third direction, the width W1 of the first side wall (1121) and the width W5 of the second recessed portion (122) satisfy the relationship: 0≤W1-W5≤2mm; and / or, Along the first direction, the maximum depth T5 of the second recessed portion (122) satisfies the relationship: 0≤T5≤20mm.

10. The battery according to any one of claims 7 to 9, characterized in that The thickness Tk of the side wall of the bottom shell (20) and the distance H2 between the outer edge of the outer flange (115) and the outer surface of the first side wall (1121) both satisfy the relationship: 0.2mm≤Tk≤H2-0.3mm≤3.5mm.

11. The battery according to any one of claims 7 to 9, characterized in that Along the first direction, the projection area S1 of the first side wall (1121), the projection area S2 of the bottom of the third groove (112), and the cross-sectional area S3 of the outer flange (115) mounted on the side wall of the bottom shell (20) along the inner and outer directions of the cover sheet (11) satisfy the relationship: 150mm 2 ≤S1≤S3≤1m 2 , 0.015<S1 / S2<0.3, 1≤S2 / S3≤1.5.

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