Battery case and battery cell

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery shell and a battery monomer, the battery shell comprises a shell body, the shell body comprises a plurality of side walls formed by bending plates, and the plurality of side walls are enclosed to form an accommodating cavity; the multiple side walls comprise a first wall body formed by bending the head end of the plate and a second wall body formed by bending the tail end of the plate, the side, facing the second wall body, of the first wall body is a first connecting part, and the side, facing the first wall body, of the second wall body is a second connecting part. The side, deviating from the containing cavity, of the first connecting part is fixedly connected with the side, facing the containing cavity, of the second connecting part, the first connecting part protrudes in the direction facing the containing cavity, and / or the second connecting part protrudes in the direction deviating from the containing cavity, and after the first connecting part and the second connecting part are welded, the welding yield and the welding reliability can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery shell and battery monomer. BACKGROUND

[0002] When the battery shell is made of stainless steel plate, the shape of the shell is obtained by bending the stainless steel plate first, and then the first end and the tail end of the plate bending are spliced and welded.

[0003] In order to reduce the overall weight of the battery, thinner stainless steel plate is usually used to make the battery shell, and because the welding position is the splicing position of the first end and the tail end of the plate, the structural strength of the weld is low, and the welding yield and welding reliability are low. In addition, because the thickness of the plate is thin, the structural strength of the plate is low, and the plate near the welding position is easy to deform due to heat during welding, further reducing the welding yield and welding reliability.

[0004] Therefore, it is urgent to provide a battery shell and a battery monomer to solve the above technical problems. UTILITY MODEL CONTENTS

[0005] The first purpose of the utility model is to provide a battery shell, which can improve the welding yield and welding reliability after welding the first connecting part and the second connecting part.

[0006] To achieve this purpose, the utility model adopts the following technical scheme:

[0007] The battery shell comprises a shell body, the shell body comprises a plurality of side walls formed by bending a plate, the plurality of side walls form an accommodating cavity, the plurality of side walls comprise a first wall body formed by bending the first end of the plate and a second wall body formed by bending the tail end of the plate, the side of the first wall body facing the second wall body is a first connecting part, the side of the second wall body facing the first wall body is a second connecting part, the side of the first connecting part away from the accommodating cavity is fixedly connected with the side of the second connecting part facing the accommodating cavity, the first connecting part is protruded in the direction facing the accommodating cavity, and / or the second connecting part is protruded in the direction away from the accommodating cavity.

[0008] Optionally, the battery shell further comprises a sealing plate, both ends of the accommodating cavity are provided with openings, and the sealing plate is plugged at one of the openings.

[0009] Optionally, the first connecting part is protruded in the direction facing the accommodating cavity, and the second connecting part is protruded in the direction away from the accommodating cavity.

[0010] Optionally, the side wall of the sealing plate is fixedly connected with the inner wall of the accommodating cavity, the side wall of the sealing plate is provided with a position avoiding groove, and part of the first connecting part is embedded in the position avoiding groove.

[0011] Optionally, the first connecting part is convex in a direction towards the accommodating cavity, and the second connecting part is in a flat plate structure.

[0012] Optionally, the side wall of the sealing plate is fixedly connected with the inner wall of the accommodating cavity, the side wall of the sealing plate is provided with a position-avoiding groove, and part of the first connecting part is embedded in the position-avoiding groove.

[0013] Optionally, the second connecting part is convex in a direction away from the accommodating cavity, and the first connecting part is in a flat plate structure.

[0014] Optionally, the thickness of the side wall is less than or equal to 0.4 mm.

[0015] Optionally, the first connecting part and the second connecting part are fixed by laser penetration welding.

[0016] The second purpose of the utility model is to provide a battery monomer, the shell of the battery monomer is made through bending process and welding process, and the welding yield and welding reliability of the shell are higher.

[0017] To achieve the purpose, the utility model adopts the following technical scheme:

[0018] The battery monomer comprises a pole group and the battery shell, and the pole group is arranged in the accommodating cavity.

[0019] The utility model has the advantages of:

[0020] The battery shell provided by the utility model is characterized in that one side of the first connecting part away from the accommodating cavity is fixedly connected with one side of the second connecting part towards the accommodating cavity, thereby forming the structure that the first connecting part and the second connecting part are arranged in overlap, when the first connecting part and the second connecting part are welded, the structure arranged in overlap increases the width of the welding position, and welding yield and welding reliability can be improved. In addition, the first connecting part is convex in a direction towards the accommodating cavity, so that the first connecting part forms a convex rib structure, the structural strength of the region of the first wall body close to the first connecting part is improved, when the first connecting part and the second connecting part are welded, the probability of thermal deformation of the region of the first wall body close to the first connecting part can be reduced, and welding yield and welding reliability are further improved. The second connecting part is convex in a direction away from the accommodating cavity, so that the second connecting part forms a convex rib structure, the structural strength of the region of the second wall body close to the second connecting part is improved, when the first connecting part and the second connecting part are welded, the probability of thermal deformation of the region of the second wall body close to the second connecting part can be reduced, and welding yield and welding reliability are further improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is an explosion structure schematic view of the battery shell provided by the utility model embodiment one;

[0022] Figure 2 It is Figure 1The enlarged structure schematic view of the middle A;

[0023] Figure 3 The first enlarged structure schematic view of the weld provided by the embodiment one of the utility model is shown in the figure;

[0024] Figure 4 The second enlarged structure schematic view of the weld provided by the embodiment one of the utility model is shown in the figure;

[0025] Figure 5 The structure schematic view of the battery shell provided by the embodiment one of the utility model is shown in the figure;

[0026] Figure 6 The first structure schematic view of the battery shell provided by the embodiment two of the utility model is shown in the figure; Figure 5 The enlarged structure schematic view of the middle B;

[0027] Figure 7 The first structure schematic view of the battery shell provided by the embodiment two of the utility model is shown in the figure;

[0028] Figure 8 The enlarged structure schematic view of the middle C; Figure 7 The enlarged structure schematic view of the middle C;

[0029] Figure 9 The enlarged structure schematic view of the weld provided by the embodiment two of the utility model is shown in the figure;

[0030] Figure 10 The second structure schematic view of the battery shell provided by the embodiment two of the utility model is shown in the figure;

[0031] Figure 11 The enlarged structure schematic view of the middle D; Figure 10 The enlarged structure schematic view of the middle D;

[0032] Figure 12 The first structure schematic view of the battery shell provided by the embodiment three of the utility model is shown in the figure;

[0033] Figure 13 The enlarged structure schematic view of the middle E; Figure 12 The enlarged structure schematic view of the middle E;

[0034] Figure 14 The enlarged structure schematic view of the weld provided by the embodiment three of the utility model is shown in the figure;

[0035] Figure 15 The second structure schematic view of the battery shell provided by the embodiment three of the utility model is shown in the figure;

[0036] Figure 16 The enlarged structure schematic view of the middle F; Figure 15 The enlarged structure schematic view of the middle F.

[0037] In the figure:

[0038] 1, shell; 11, containing cavity; 12, first wall body; 121, first connecting part; 13, second wall body; 131, second connecting part; 2, sealing plate; 21, avoiding slot; 3, welding seam. DETAILED DESCRIPTION

[0039] The utility model will be described in further detail below in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.

[0040] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0041] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0042] In the description of the embodiment, the terms "upper", "lower", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0043] Example one

[0044] The embodiment provides a battery shell, which can improve the welding yield and welding reliability after welding the first connecting part and the second connecting part.

[0045] Specifically, as Figure 1 and Figure 2As shown, the battery shell comprises a shell body 1, the shell body 1 comprises a plurality of side walls formed by bending a plate material, the plurality of side walls enclose a receiving cavity 11, the plurality of side walls comprise a first wall body 12 formed by bending a first end of the plate material and a second wall body 13 formed by bending a second end of the plate material, a first connecting portion 121 is formed on a side of the first wall body 12 facing the second wall body 13, a second connecting portion 131 is formed on a side of the second wall body 13 facing the first wall body 12, the first connecting portion 121 is fixedly connected to the second connecting portion 131 on a side of the first connecting portion 121 facing away from the receiving cavity 11 and on a side of the second connecting portion 131 facing the receiving cavity 11, the first connecting portion 121 is protruded in a direction facing the receiving cavity 11, and / or the second connecting portion 131 is protruded in a direction facing away from the receiving cavity 11. It should be noted that the plate material is made of sheet metal by stamping process. The specific stamping process is prior art in the field, which will not be described here. In the embodiment, the plate material is a stainless steel plate material, of course, in other embodiments, an aluminum or other material plate material can also be selected.

[0046] Based on the above design, the first connecting portion 121 is fixedly connected to the second connecting portion 131 on a side of the first connecting portion 121 facing away from the receiving cavity 11 and on a side of the second connecting portion 131 facing the receiving cavity 11, thereby forming a structure in which the first connecting portion 121 and the second connecting portion 131 are overlapped, as shown in Figure 3 When the first connecting portion 121 and the second connecting portion 131 are welded, the overlapped structure increases the width of the welding position, thereby increasing the width of the welding seam 3, achieving the effect of improving the welding yield and welding reliability.

[0047] On the other hand, the first connecting portion 121 is protruded in a direction facing the receiving cavity 11, so that the first connecting portion 121 forms a protruding rib structure, improving the structural strength of the area of the first wall body 12 close to the first connecting portion 121, when the first connecting portion 121 and the second connecting portion 131 are welded, the probability of thermal deformation of the area of the first wall body 12 close to the first connecting portion 121 is reduced, further improving the welding yield and welding reliability; and / or the second connecting portion 131 is protruded in a direction facing away from the receiving cavity 11, so that the second connecting portion 131 forms a protruding rib structure, improving the structural strength of the area of the second wall body 13 close to the second connecting portion 131, when the first connecting portion 121 and the second connecting portion 131 are welded, the probability of thermal deformation of the area of the second wall body 13 close to the second connecting portion 131 is reduced, further improving the welding yield and welding reliability.

[0048] Further, the first connecting portion 121 and the second connecting portion 131 are fixed by laser penetration welding, as shown in Figure 4As shown, the weld 3 formed by the laser penetration welding penetrates from the side of the second connecting portion 131 away from the first connecting portion 121 to the side of the first connecting portion 121 away from the second connecting portion 131, obviously increasing the thickness of the weld 3, and further improving the reliability of the welding of the first connecting portion 121 and the second connecting portion 131. It should be noted that the laser penetration welding process is prior art in the field, and the specific process flow is not described here.

[0049] Further, as shown in Figure 2 and Figure 3 , the first connecting portion 121 is convex in the direction towards the accommodating cavity 11, and the second connecting portion 131 is convex in the direction away from the accommodating cavity 11, i.e. the first connecting portion 121 and the second connecting portion 131 both form a convex rib structure, while improving the structural strength of the region of the first wall body 12 close to the first connecting portion 121 and the structural strength of the region of the second wall body 13 close to the second connecting portion 131, and when welding the first connecting portion 121 and the second connecting portion 131, the probability of thermal deformation of the above two regions is relatively low, which provides a strong guarantee for the welding yield and welding reliability.

[0050] Optionally, as shown in Figure 1 , the battery shell further comprises a sealing plate 2, and both ends of the accommodating cavity 11 are provided with openings, and the sealing plate 2 is sealed at one of the openings.

[0051] Further, as shown in Figure 5 and Figure 6 , the side wall of the sealing plate 2 and the inner wall of the accommodating cavity 11 are fixedly connected by welding process to realize the structure of the sealing plate 2 sealing the opening of the accommodating cavity 11, and the side wall of the sealing plate 2 is provided with a position avoiding groove 21, and part of the first connecting portion 121 is embedded in the position avoiding groove 21 to realize the position avoiding of the first connecting wall.

[0052] Optionally, the thickness of the side wall is less than or equal to 0.4mm, and exemplarily, the thickness of the side wall can be 0.4mm, 0.3mm, 0.2mm or 0.15mm, etc., and preferably, the thickness of the side wall is less than or equal to 0.3mm, and limiting the thickness of the side wall to below 0.4mm can reduce the weight and volume of the shell 1, and further improve the energy density of the battery monomer.

[0053] The embodiment also provides a battery monomer, which comprises a pole group and the battery shell, the pole group is arranged in the accommodating cavity 11, and the battery monomer adopts the battery shell, the shell body 1 of the battery shell is manufactured through a bending process and a welding process, the thickness and width of the welding seam 3 can be increased when welding due to the overlapping arrangement of the first connecting part 121 and the second connecting part 131, and the welding yield and welding reliability are further improved; in addition, the first connecting part 121 is protruded in the direction towards the accommodating cavity 11, and / or the second connecting part 131 is protruded in the direction away from the accommodating cavity 11, and the welding yield and welding reliability are further improved.

[0054] Embodiment two

[0055] The embodiment provides a battery shell, which is different from the battery shell provided in the embodiment one in that:

[0056] As shown in Figures 7 to 9 , the first connecting part 121 is protruded in the direction towards the accommodating cavity 11, and the second connecting part 131 is in a flat plate structure, so that the structure of the overlapping arrangement of the first connecting part 121 and the second connecting part 131 is formed, the width of the welding position can be increased when welding the first connecting part 121 and the second connecting part 131, and the width of the welding seam 3 can be further increased, so that the welding yield and welding reliability are improved. In addition, the first connecting part 121 is protruded in the direction towards the accommodating cavity 11, so that the first connecting part 121 forms a protruding rib structure, the structural strength of the region of the first wall body 12 close to the first connecting part 121 is improved, the probability of the region of the first wall body 12 close to the first connecting part 121 being deformed by heat when welding the first connecting part 121 and the second connecting part 131 is reduced, and the welding yield and welding reliability are further improved.

[0057] Further, as shown in Figure 10 and Figure 11 , the side wall of the sealing plate 2 and the inner wall of the accommodating cavity 11 are fixedly connected through a welding process, so that the structure of the sealing plate 2 sealing the opening of the accommodating cavity 11 is realized, the side wall of the sealing plate 2 is provided with a position-avoiding groove 21, and part of the first connecting part 121 is embedded in the position-avoiding groove 21, so that the position of the first connecting wall is avoided.

[0058] Embodiment three

[0059] The embodiment provides a battery shell, which is different from the battery shell provided in the embodiment one in that:

[0060] As shown in Figures 12 to 14As shown, the second connecting part 131 is protruded in the direction away from the accommodating cavity 11, and the first connecting part 121 is in a flat plate structure, thereby forming the structure that the first connecting part 121 and the second connecting part 131 are overlapped, when welding the first connecting part 121 and the second connecting part 131, the width of the welding position can be increased, and then the width of the welding seam 3 can be increased, thereby improving the welding yield and welding reliability. Moreover, the second connecting part 131 is protruded in the direction away from the accommodating cavity 11, so that the second connecting part 131 forms a protruding rib structure, thereby improving the structural strength of the second wall 13 near the second connecting part 131, when welding the first connecting part 121 and the second connecting part 131, the probability of the second wall 13 near the second connecting part 131 being deformed by heat can be reduced, thereby further improving the welding yield and welding reliability.

[0061] Further, as shown in Figs. 1 and 2, Figure 15 and Figure 16 As shown, the side wall of the sealing plate 2 is fixedly connected with the inner wall of the accommodating cavity 11 through the welding process, so as to realize the structure that the sealing plate 2 blocks the opening of the accommodating cavity 11, in the embodiment, the first connecting part 121 is in a flat plate structure, that is, the first connecting part 121 is not protruded towards the accommodating cavity 11, therefore, the avoiding slot 21 does not need to be arranged on the side wall of the sealing plate 2.

[0062] Obviously, the above embodiments of the present application are only examples for clearly explaining the present application, and are not the limitation to the embodiments of the present application. For the ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the present application. Here, all the embodiments do not need to be exhausted. Any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery casing, characterized in that, The device includes a housing (1), which includes a plurality of sidewalls formed by bending a sheet metal, the plurality of sidewalls enclosing a receiving cavity (11). The plurality of sidewalls include a first wall (12) formed by bending from the first end of the sheet metal and a second wall (13) formed by bending from the end of the sheet metal. The side of the first wall (12) facing the second wall (13) is a first connecting portion (121), and the side of the second wall (13) facing the first wall (12) is a second connecting portion (131). The side of the first connecting portion (121) away from the receiving cavity (11) is fixedly connected to the side of the second connecting portion (131) facing the receiving cavity (11). The first connecting portion (121) protrudes in the direction toward the receiving cavity (11), and / or the second connecting portion (131) protrudes in the direction away from the receiving cavity (11).

2. The battery casing according to claim 1, characterized in that, The battery casing also includes a sealing plate (2), and the receiving cavity (11) has openings at both ends, with the sealing plate (2) sealing one of the openings.

3. The battery casing according to claim 2, characterized in that, The first connecting portion (121) protrudes in the direction toward the receiving cavity (11), and the second connecting portion (131) protrudes in the direction away from the receiving cavity (11).

4. The battery casing according to claim 3, characterized in that, The side wall of the sealing plate (2) is fixedly connected to the inner wall of the receiving cavity (11). The side wall of the sealing plate (2) is provided with a clearance groove (21), and part of the first connecting part (121) is embedded in the clearance groove (21).

5. The battery casing according to claim 2, characterized in that, The first connecting part (121) protrudes in the direction toward the receiving cavity (11), and the second connecting part (131) has a flat plate structure.

6. The battery casing according to claim 5, characterized in that, The side wall of the sealing plate (2) is fixedly connected to the inner wall of the receiving cavity (11). The side wall of the sealing plate (2) is provided with a clearance groove (21), and part of the first connecting part (121) is embedded in the clearance groove (21).

7. The battery casing according to claim 1, characterized in that, The second connecting part (131) protrudes in a direction away from the receiving cavity (11), and the first connecting part (121) has a flat plate structure.

8. The battery casing according to any one of claims 1-7, characterized in that, The thickness of the sidewall is less than or equal to 0.4 mm.

9. The battery casing according to any one of claims 1-7, characterized in that, The first connecting part (121) and the second connecting part (131) are fixed by laser penetration welding.

10. A single battery cell, characterized in that, Includes an electrode assembly and a battery case according to any one of claims 1-9, wherein the electrode assembly is disposed within the receiving cavity (11).

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