Shell cover, shell, battery shell, battery and electric device

Abstract

The utility model discloses a shell cover, a shell, a battery shell, a battery and an electric device. The battery case comprises a case body and a case cover. The housing is provided with at least one end opening in a first direction. The shell cover is arranged at the end opening of the shell, and the edge of the shell cover is used for being connected with the edge of at least one end opening of the shell. The shell cover comprises a first cover part and a second cover part, and the first cover part protrudes relative to the second cover part so that the first cover part and the second cover part can be staggered in the first direction. According to the utility model, the welding seam in a bending and staggering form is arranged, so that relatively large welding deformation can be compatible, the possibility of occurrence of welding defects is reduced, and the welding quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, and in particular to a shell cover, a shell, a battery shell, a battery and an electrical device. Background Art

[0002] At present, the conventional battery shell cover welding structure is usually composed of a battery shell and a battery cover. When making steel shell batteries, if the shell is thin, the shell will produce a large deformation during welding due to welding stress, resulting in gaps between the shell and the cover during welding. Especially after welding long welds, the assembly gap is concentrated at the corners of the battery, which is prone to laser welding defects such as weld holes and unfused welds.

[0003] Therefore, a case cover, a housing, a battery case, a battery and an electric device are needed to at least partially solve the above problems. Utility Model Content

[0004] A series of simplified concepts are introduced in the utility model content section, which will be further described in detail in the detailed implementation section. The utility model content section of the utility model does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0005] In order to at least partially solve the above problems, the utility model provides a shell cover for a battery shell, the battery shell further comprising a shell, the shell being provided with at least one end opening along a first direction, the shell cover being provided at the end opening, and an edge of the shell cover being provided to be connected with an edge of at least one end opening of the shell;

[0006] The housing cover includes a first cover portion and a second cover portion, wherein the first cover portion protrudes relative to the second cover portion so that the first cover portion and the second cover portion are misaligned along the first direction.

[0007] According to the shell cover of the utility model, a welding seam in the form of bending and dislocation is provided, which can accommodate larger welding deformation, reduce the possibility of welding defects, and improve welding quality.

[0008] Optionally, the shell cover further includes a transition portion, the first cover portion and the transition portion are transitionally connected via a first arc segment, the second cover portion and the transition portion are transitionally connected via a second arc segment, and the first arc segment and the second arc segment are connected via the transition portion.

[0009] Optionally, the transition portion is extended along the first direction.

[0010] Optionally, the radius of the first arc segment and the radius of the second arc segment are both r;

[0011] The first cover portion is parallel to the second cover portion, and the first cover portion and the second cover portion are offset by a dimension L along the first direction;

[0012] Among them, 0<r≤L / 2.

[0013] Optionally, the edge of the shell cover includes:

[0014] a first cover edge, wherein at least a portion of the first cover edge extends along a second direction, and the second direction is orthogonal to the first direction;

[0015] a second cover edge, the second cover edge being disposed adjacent to the first cover edge, the second cover edge extending along a third direction, the third direction being orthogonal to the second direction, and the third direction being orthogonal to the first direction;

[0016] The dimension of the first cover edge along the second direction is greater than the dimension of the second cover edge along the third direction, and the first cover edge is adapted to the second cover edge and the edge shape of the end opening and is welded together.

[0017] Optionally, the shell cover includes: a positive electrode shell cover and a negative electrode shell cover, the first cover portion of the positive electrode shell cover corresponds to the first cover portion of the negative electrode shell cover along the first direction, or the first cover portion of the positive electrode shell cover is offset from the first cover portion of the negative electrode shell cover along the first direction.

[0018] Optionally, the misalignment dimension of the first cover portion and the second cover portion of the positive electrode case cover along the first direction is different from the misalignment dimension of the first cover portion and the second cover portion of the negative electrode case cover along the first direction; and / or

[0019] The radii of the first arc segment and the second arc segment of the positive electrode case cover are different from the radii of the first arc segment and the second arc segment of the negative electrode case cover.

[0020] A second aspect of the utility model provides a shell for a battery shell, the battery shell further comprising a shell cover, the shell being provided with at least one end opening along a first direction, the end opening being used to provide the shell cover, and the edge of the end opening being used to connect to the edge of the shell cover;

[0021] The edge of the end opening includes a first shell edge, the first shell edge includes a first section and a second section, the first section and the second section extend along a second direction, the second direction is orthogonal to the first direction, and the first section and the second section are staggered along the first direction.

[0022] According to the shell of the present application, a welding seam in the form of a bending and dislocation is provided, which can accommodate larger welding deformation, reduce the possibility of welding defects, and improve welding quality.

[0023] Optionally, the first shell edge also includes a bending segment, the first segment is transitionally connected to the bending segment via a third arc segment, the second segment is transitionally connected to the bending segment via a fourth arc segment, and the third arc segment is connected to the fourth arc segment via the bending segment.

[0024] Optionally, the radius of the third arc segment and the radius of the fourth arc segment are both r;

[0025] The first section is parallel to the second section, and the first section and the second section are offset by a dimension L along the first direction;

[0026] Among them, 0<r≤L / 2.

[0027] Optionally, the edge of the end opening also includes a second shell edge, the second shell edge extends along a third direction, the second direction is orthogonal to the third direction, and the third direction is orthogonal to the first direction, the size of the first shell edge along the second direction is larger than the size of the second shell edge along the third direction, and the first shell edge is adapted to the shape of the second shell edge and the shell cover edge and is welded together.

[0028] Optionally, the thickness of the wall of the shell is less than 0.3 mm.

[0029] Optionally, the thickness of the wall of the shell is less than or equal to 0.15 mm.

[0030] A third aspect of the present utility model provides a battery case, the battery case comprising:

[0031] The housing cover as described in the first aspect above; and

[0032] The housing described in the second aspect above;

[0033] Wherein, the shell body is connected to the shell cover by welding.

[0034] The battery shell according to the utility model has the technical effects similar to those of the shell cover and the shell body described in the first aspect, with fewer defects and high welding quality.

[0035] A fourth aspect of the present invention provides a battery, comprising the battery shell described in the first aspect.

[0036] The battery according to the utility model has a technical effect similar to that of the battery shell described in the third aspect above, with fewer defects and high welding quality.

[0037] A fifth aspect of the present invention provides an electrical device, which includes the battery described in the fourth aspect.

[0038] The electrical device according to the utility model has a technical effect similar to that of the battery described in the fourth aspect above. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The following drawings of the present invention are used as a part of the present invention for understanding the present invention. The drawings show the embodiments of the present invention and their descriptions, and are used to explain the principle of the present invention.

[0040] In the attached figure:

[0041] Figure 1 is a three-dimensional schematic diagram of a battery according to the present application;

[0042] Figure 2 is a perspective schematic diagram of a battery according to the present application;

[0043] Figure 3 is a schematic diagram of a battery shell according to the present application; and

[0044] Figure 4 It is a schematic diagram of a shell cover of a battery shell according to the present application.

[0045] Description of reference numerals:

[0046] 10: Battery 11: Battery cell 100: Battery case

[0047] 110: Shell 111: First shell side 112: Second shell side

[0048] 113: First section 114: Second section 115: Bend section

[0049] 130: Shell cover 130A: Positive electrode shell cover 130B: Negative electrode shell cover

[0050] 131: first cover part 132: second cover part 133: transition part

[0051] 134: First cover edge 135: Second cover edge 136: Pole

[0052] 136A: positive pole 136B: negative pole D1: first direction

[0053] D2: Second direction D3: Third direction DETAILED DESCRIPTION

[0054] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0055] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of the features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0056] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifiers and do not have any other meaning, such as a specific order. Moreover, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component". It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inner", "outer" and similar expressions used in this document are for illustrative purposes only and are not limiting.

[0057] Now, refer to the attached Figure 1 To the attached Figure 4 Exemplary embodiments according to the present invention are described in more detail.

[0058] refer to Figure 1 and Figure 2 On one hand, the present application provides a battery 10 , which includes a battery shell 100 and a battery cell 11 , wherein the battery cell 11 is disposed in the battery shell 100 .

[0059] Among them, the battery shell 100 includes a shell 110 and a shell cover 130. The shell 110 has a accommodating cavity that runs through along the first direction D1. In other words, the end of the shell 110 along the first direction D1 is provided with at least one end opening, preferably two. The accommodating cavity is used to accommodate the battery cell 11. The shell cover 130 is arranged at the end opening of the shell 110, and the shell cover 130 includes a first cover portion 131 and a second cover portion 132. The first cover portion 131 protrudes relative to the second cover portion 132, so that the first cover portion 131 and the second cover portion 132 are misaligned along the first direction D1.

[0060] According to the battery shell of the utility model, a welding seam in the form of a bending and dislocation is provided, which can accommodate larger welding deformation, reduce the possibility of welding defects, and improve welding quality.

[0061] Specifically, refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The edge of the end opening of the shell 110 along the first direction D1 has a first shell edge 111 and a second shell edge 112 arranged adjacent to each other, the first shell edge 111 at least partially extends along the second direction D2, and the second shell edge 112 at least partially extends along the third direction D3. The size of the first shell edge 111 along the second direction D2 is greater than the size of the second shell edge 112 along the third direction D3, wherein the second direction D2 is orthogonal to the third direction D3, and the first direction D1 is orthogonal to the second direction D2. The first direction D1 may be the length direction of the battery 10, the second direction D2 may be the width direction of the battery 10, and the third direction D3 may be the thickness direction of the battery 10.

[0062] The edge of the shell cover 130 has a first cover edge 134 and a second cover edge 135 which are adjacently arranged. The first cover edge 134 is adapted to the shape of the first shell edge 111 and is welded together. The second cover edge 135 is adapted to the shape of the second shell edge 112 and is welded together. The first cover edge 134 at least partially extends along the second direction D2, and the second cover edge 135 extends along the third direction D3 and is located at the second cover portion 132.

[0063] Furthermore, the first shell edge 111 and the first cover edge 134 extend at least partially along the first direction D1. That is, the first shell edge 111 and the first cover edge 134 are edges with bending and dislocation. In other words, the first shell edge 111 and the first cover edge 134 are roughly constructed in an "S" shape. Among them, the first shell edge 111 has a first section 113, a second section 114 and a bending section 115. Among them, the first section 113 and the bending section 115 have an arc transition, and the second section 114 and the bending section 115 have an arc transition. In other words, the bending section 115 is connected between the first section 113 and the second section 114, and the first section 113 and the second section 114 are dislocated along the first direction D1. The position of the first section 113 corresponds to the first cover portion 131 of the shell cover 130, the position of the second section 114 corresponds to the second cover portion 132 of the shell cover 130, and the position of the bending section 115 corresponds to the transition portion 133 of the shell cover 130. In the illustrated embodiment, the first section 113 is located at a protruding portion of the housing 110 , and the second section 114 is located at a recessed portion of the housing 110 .

[0064] Optionally, the thickness of the housing 110 is less than 0.3 mm. Preferably, the thickness of the housing 110 is less than or equal to 0.15 mm. The housing 110 may be made of aluminum or steel, and the housing cover 130 may be made of aluminum or steel.

[0065] In the general welding of battery shells and battery cover plates, due to welding stress, the battery shell will produce large deformation, resulting in gaps between the battery shell and the battery cover plate during welding, especially after welding long welds. The assembly gap is concentrated at the corners of the battery. When the battery shell is thicker (such as greater than 0.3mm), the battery shell (such as aluminum shell) melts to fill the corner gaps, thereby achieving the sealing of the weld. However, when the battery shell is thinner (for example, less than or equal to 0.15mm), especially the shells of steel shell batteries are mostly thinner, it is difficult for the shell to melt during welding to fill the gaps, and laser welding defects such as weld holes and unfused welds are prone to occur. Even if the thin shell is melted and fills the gaps, residual stress and cracking are easily generated at the corners and short side welds of the battery due to the large gap compensation of the parent material during welding, and the battery 10 has a high risk of failure during use.

[0066] The "S"-shaped edge design of the present application, due to the presence of the rounded corners of the bent portion, can accommodate larger welding deformations and improve assembly quality, thereby increasing the feasibility of welding thin shell structures.

[0067] In the present application, the gap at the corner of the shell cover 130 is transferred to the fillet of the long weld (first shell edge 111), and the welding deformation generated during the welding process can be evenly distributed at the fillet to prevent the welding deformation from accumulating at one point and causing the gap in individual areas to exceed the tolerance. The structure in the present application does not require a thinner shell to melt and compensate for the large weld gap during welding, so the welding residual stress is small, the risk of delayed cracks is small, and the risk of battery welding failure is low. In addition, because this structure can accommodate larger welding deformations, the processing accuracy of the battery welding tooling can be reduced, thereby reducing the difficulty and cost of production.

[0068] For a more detailed structure of the housing cover 130, refer to Figure 1 , Figure 2 and Figure 4 The shell cover 130 includes a first cover portion 131, a transition portion 133 connected to the first cover portion 131, and a second cover portion 132 connected to the transition portion 133. In other words, the transition portion 133 is connected between the first cover portion 131 and the second cover portion 132. Among them, the first cover portion 131 and the transition portion 133 are transitionally connected through a first arc segment, and the second cover portion 132 and the transition portion 133 are transitionally connected through a second arc segment, that is, the first arc segment and the second arc segment are connected through the transition portion 133. The transition portion 133 preferably extends along the first direction D1. The shell cover 130 also includes a pole 136, which is arranged through the shell cover 130 and is electrically connected to the battery cell 11. Among them, the pole 136 is preferably arranged on the first cover portion 131. Optionally, the pole 136 can also be arranged on the second cover portion 132. The material of the pole 136 can be copper.

[0069] The edge of the first cover portion 131 extending along the second direction D2, the edge of the transition portion 133 extending along the first direction D1 and the edge of the second cover portion 132 extending along the second direction D2 together form the first cover edge 134. The edge of the second cover portion 132 extending along the third direction D3 forms the second cover edge 135.

[0070] As an optional embodiment, the first cover portion 131 is parallel to the second cover portion 132, and the radius of the first arc segment and the radius of the second arc segment are both r. The offset dimension of the first cover portion 131 and the second cover portion 132 along the first direction D1 is L, in other words, the dimension of the transition portion 133 along the first direction D1 is L. Among them, 0<r≤L / 2 must be satisfied.

[0071] It can be understood that the first shell edge 111 corresponds to the first cover edge 134, the dimension of the misalignment in the first direction D1 between the first section 113 and the second section 114 is L, the radius of the transition arc between the first section 113 and the bending section 115 is r, and the radius of the transition arc between the second section 114 and the bending section 115 is r. The first section 113 is parallel to the second section 114. In other words, the first shell edge 111 also includes the bending section 115, the first section 113 and the bending section 115 are transitionally connected through the third arc section, and the second section 114 and the bending section 115 are transitionally connected through the fourth arc section, wherein the radius of the third arc section and the radius of the fourth arc section are both r. Similarly, L and r satisfy 0<r≤L / 2.

[0072] In other optional implementations, the transition portion 133 may also extend along other directions intersecting the first direction D1 , but the prerequisite is that the transition portion 133 and the first cover portion 131 and the second cover portion 132 are all required to form an arc transition.

[0073] As an optional embodiment, the shell cover 130 includes a positive shell cover 130A and a negative shell cover 130B, and the first cover portion 131 of the positive shell cover 130A and the first cover portion 131 of the negative shell cover 130B are offset along the first direction D1. For example, as shown in the figure, the first cover portions 131 of the shell covers 130 at both ends of the battery shell 100 along the first direction D1 are located on both sides of the battery shell 100 along the second direction D2. It can also be understood that the positive electrode column 136A on the positive shell cover 130A and the negative electrode column 136B on the negative shell cover 130B are staggered in the first direction D1, or the positive electrode column 136A and the negative electrode column 136B are not collinear. Reflected in Figure 1 and Figure 2 In the embodiment, the positive electrode column 136A and the negative electrode column 136B are both located on the protruding portion of the battery case 100 .

[0074] As another optional embodiment, the first cover portion 131 of the positive electrode shell cover 130A corresponds to the first cover portion 131 of the negative electrode shell cover 130B in the first direction D1. In other words, the first cover portions 131 of the shell covers 130 at both ends of the battery shell 100 in the first direction D1 are located on the same side of the battery shell 100 in the second direction D2. This is generally reflected in the figure as "convex to convex and concave to concave" in the first direction D1.

[0075] Optionally, the size of the misalignment of the first cover portion 131 and the second cover portion 132 of the positive electrode case cover 130A along the first direction D1 is different from the size of the misalignment of the first cover portion 131 and the second cover portion 132 of the negative electrode case cover 130B along the first direction D1. That is, the size of the transition portion 133 of the positive electrode case cover 130A along the first direction D1 is different from the size of the transition portion 133 of the negative electrode case cover 130B along the first direction D1. The radius of the first arc segment and the second arc segment of the positive electrode case cover 130A is different from the radius of the first arc segment and the second arc segment of the negative electrode case cover 130B.

[0076] The utility model also provides an electric device, which includes the above-mentioned battery. The battery according to the utility model has similar technical effects as the above-mentioned battery.

[0077] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. The features described herein in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable or otherwise specified in the other embodiment.

[0078] The present invention has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and explanation, and the present invention is not limited to the above-mentioned embodiments. According to the teachings of the present invention, more variations and modifications can be made, and these variations and modifications all fall within the scope of protection required by the present invention.

Claims

1. A shell cover for a battery shell, wherein the battery shell further comprises a shell, characterized in that: The shell is provided with at least one end opening along a first direction, the shell cover is used to be arranged at the end opening, and the edge of the shell cover is used to be connected with the edge of at least one end opening of the shell; The housing cover includes a first cover portion and a second cover portion, wherein the first cover portion protrudes relative to the second cover portion so that the first cover portion and the second cover portion are misaligned along the first direction.

2. The housing cover according to claim 1, characterized in that: The shell cover also includes a transition portion, the first cover portion and the transition portion are transitionally connected via a first arc segment, the second cover portion and the transition portion are transitionally connected via a second arc segment, and the first arc segment and the second arc segment are connected via the transition portion.

3. The housing cover according to claim 2, characterized in that: The transition portion is extended along the first direction.

4. The housing cover according to claim 2, characterized in that: The radius of the first arc segment and the radius of the second arc segment are both r; The first cover portion is parallel to the second cover portion, and the first cover portion and the second cover portion are offset by a dimension L along the first direction; Among them, 0<r≤L / 2.

5. The housing cover according to claim 1, characterized in that: The edge of the shell cover includes: a first cover edge, wherein at least a portion of the first cover edge extends along a second direction, and the second direction is orthogonal to the first direction; a second cover edge, the second cover edge being disposed adjacent to the first cover edge, the second cover edge extending along a third direction, the third direction being orthogonal to the second direction, and the third direction being orthogonal to the first direction; The dimension of the first cover edge along the second direction is greater than the dimension of the second cover edge along the third direction, and the first cover edge is adapted to the second cover edge and the edge shape of the end opening and is welded together.

6. The housing cover according to claim 2, characterized in that: The case cover includes: a positive case cover and a negative case cover, the first cover portion of the positive case cover corresponds to the first cover portion of the negative case cover along the first direction, or the first cover portion of the positive case cover is offset from the first cover portion of the negative case cover along the first direction.

7. The housing cover according to claim 6, characterized in that: The offset dimension of the first cover portion and the second cover portion of the positive electrode case cover along the first direction is different from the offset dimension of the first cover portion and the second cover portion of the negative electrode case cover along the first direction; and / or The radii of the first arc segment and the second arc segment of the positive electrode case cover are different from the radii of the first arc segment and the second arc segment of the negative electrode case cover.

8. A shell for a battery shell, the battery shell also comprising a shell cover, characterized in that: The shell is provided with at least one end opening at the end along the first direction, the end opening is used to set the shell cover, and the edge of the end opening is used to connect to the edge of the shell cover; The edge of the end opening includes a first shell edge, the first shell edge includes a first section and a second section, the first section and the second section extend along a second direction, the second direction is orthogonal to the first direction, and the first section and the second section are staggered along the first direction.

9. The housing according to claim 8, characterized in that The first shell edge also includes a bending segment, the first segment is transitionally connected to the bending segment via a third arc segment, the second segment is transitionally connected to the bending segment via a fourth arc segment, and the third arc segment is connected to the fourth arc segment via the bending segment.

10. The housing according to claim 9, characterized in that The radius of the third arc segment and the radius of the fourth arc segment are both r; The first section is parallel to the second section, and the first section and the second section are offset by a dimension L along the first direction; Among them, 0<r≤L / 2.

11. The housing according to claim 8, characterized in that The edge of the end opening also includes a second shell edge, which extends along a third direction, the second direction is orthogonal to the third direction, and the third direction is orthogonal to the first direction, the size of the first shell edge along the second direction is larger than the size of the second shell edge along the third direction, and the first shell edge is adapted to the shape of the second shell edge and the shell cover edge and is welded together.

12. The housing according to claim 8, characterized in that The thickness of the wall of the housing is less than 0.3 mm.

13. The housing according to claim 12, characterized in that The thickness of the wall of the housing is less than or equal to 0.15 mm.

14. A battery case, characterized in that: The battery case comprises: A housing cover according to any one of claims 1 to 7; and A housing according to any one of claims 8 to 13; Wherein, the shell body is connected to the shell cover by welding.

15. A battery, characterized in that: The battery comprises the battery case according to claim 14.

16. An electrical device, characterized in that: The electric device comprises the battery according to claim 15.

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