Battery case

Abstract

The utility model relates to the field of batteries, in particular to a battery shell which is formed by enclosing a plurality of side walls, a first splicing seam is formed between two adjacent side walls, and the two adjacent side walls are connected together by welding at the first splicing seam. Splicing parts are arranged at the positions, located at the two ends of the first splicing seam, of the two adjacent side walls, and the two adjacent side walls are limited to be in a splicing state through the splicing parts. According to the utility model, the splicing part capable of limiting the two to-be-welded side walls in the splicing state is arranged, so that the two side walls can be more tightly attached without skewing, the welding yield is higher, and meanwhile, the groove and the bump which can be clamped with each other are also arranged between the first splicing block and the second splicing block of the splicing part, so that the welding quality is improved. And two adjacent surfaces to be welded can be prevented from expanding outwards, so that the appearance of the shell is more regular, and the yield of processed finished products is higher.

Description

Technical Field

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

[0002] With the rapid development of lithium batteries, major car companies and battery developers have higher and higher requirements for battery safety performance. Not only are they more stringent in the selection of battery shell materials, but they also have higher requirements for the processing technology of battery shells. In the prior art, the power battery shell is usually stamped into a specified shape and size, and then the stamped material is bent into a target shape, and then the two ends of the material are welded to form a complete power battery shell. In the prior art, the material bent into the target shape is placed on a welding jig for welding, but neither the welding jig nor the power battery shell to be welded itself has a positioning device that can accurately align the two ends of the weld formed on the material and will not move relative to each other, which makes the welding quality at the weld unstable and may cause misalignment. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a battery housing.

[0004] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a battery casing, which is surrounded by a plurality of side walls, and a first splicing seam is formed between adjacent side walls, and the two adjacent side walls are connected together by welding at the first splicing seam, and splicing parts are provided on the adjacent two side walls at both ends of the first splicing seam, and the splicing parts limit the adjacent two side walls in a splicing state.

[0005] Furthermore, the two adjacent side walls are located in different planes; and the two adjacent side walls form a predetermined angle after being spliced.

[0006] Furthermore, the two adjacent side walls are located in the same plane.

[0007] Furthermore, the first joint seam is formed between any two adjacent side walls.

[0008] Furthermore, the joint portion includes a first joint block disposed at a corresponding end of a first side wall of the adjacent two side walls and a second joint block disposed at a corresponding end of a second side wall of the adjacent two side walls.

[0009] Furthermore, the first assembling block and the second assembling block both protrude from the end sides of the corresponding side walls;

[0010] The lateral dimensions of the first and second splicing blocks are both smaller than the lateral dimensions of the corresponding side walls, and the first splicing block is located on a side of the first side wall close to the second side wall, and the second splicing block is located on a side of the second side wall close to the first side wall.

[0011] Furthermore, a second joint seam is formed between the first joint block and the second joint block;

[0012] The second joint seam and the first joint seam are located on the same straight line; or

[0013] The second joint seam is in a curve shape and / or a fold line shape.

[0014] Further, a groove opening toward the second splicing block is provided on the side of the first splicing block facing the second splicing block, and a convex block matching with the groove is provided on the side of the second splicing block facing the first splicing block, and the convex block is matched in the groove to form the second splicing seam in a zigzag shape;

[0015] The groove is defined as a dovetail groove with a small mouth and a large bottom, and the shape of the protrusion is adapted to the shape of the dovetail groove.

[0016] Furthermore, the second splicing seam includes a first seam section located in the same straight line as the first splicing seam and connected to each other, a second seam section formed between the first groove wall of the groove and the first side edge of the protrusion, a third seam section formed between the groove bottom wall of the groove and the convex edge of the protrusion, a third seam section formed between the second groove wall of the groove and the second side edge of the protrusion, and a fourth seam section connected to the third seam section and located in the same straight line as the first seam section; the fourth seam section runs through the splicing portion outwardly.

[0017] Further, it comprises two oppositely disposed first side walls and second side walls, two oppositely disposed third side walls and fourth side walls, wherein the first side walls, the second side walls, the third side walls and the fourth side walls enclose a shell having a rectangular cross section, and the shell has a through cavity; the first joint seam may be defined as being formed between the first side wall and the third side wall, between the first side wall and the fourth side wall, between the second side wall and the third side wall and / or between the second side wall and the fourth side wall; or

[0018] The first side wall, the second side wall, the third side wall and the fourth side wall are all formed by bending a plate. The first half side wall of one of the side walls is formed by bending the head end of the plate, and the second half side wall of one of the side walls is formed at the tail end of the plate. The first half side wall and the second half side wall are spliced ​​on the same plane to form a completed side wall. The first half side wall and the second half side wall are adjacent to each other and the first splicing seam is formed therebetween. The splicing parts are provided at both ends of the first half side wall and the second half side wall.

[0019] The battery shell of the utility model has at least the following beneficial effects: a splicing portion is provided that can limit the two side walls to be welded in a splicing state, so that the two side walls can fit more closely without being skewed, and the welding yield rate is higher; at the same time, grooves and protrusions that can be engaged with each other are provided between the first splicing block and the second splicing block of the splicing portion, which can prevent the two adjacent surfaces to be welded from expanding outward, so that the appearance of the shell is more regular and the yield rate of the finished product is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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:

[0021] Figure 1 This is a schematic structural diagram of an embodiment of a battery housing of the utility model;

[0022] Figure 2 for Figure 1 Schematic diagram of the local structure at A in the middle;

[0023] Figure 3 This is a schematic structural diagram of a battery housing in an embodiment of the utility model when the second joint seam is a broken line type;

[0024] Figure 4 This is a schematic structural diagram of a battery housing in an embodiment of the utility model when the second joint seam is a curved shape;

[0025] Figure 5 It is a structural schematic diagram of an embodiment of a battery housing of the utility model.

[0026] The meanings of the symbols in the accompanying drawings are:

[0027] First side wall 1, second side wall 2, third side wall 3, fourth side wall 4, first half side wall 41, second half side wall 42, cavity 5, first splicing seam 6a, first splicing seam 6b, splicing portion 7a, splicing portion 7b, first splicing block 71a, first splicing block 71b, second splicing block 72a, second splicing block 72b, groove 73, protrusion 74, first chamfer 75, second chamfer 76, second splicing seam 8a, second splicing seam 8b, first seam section 81, second seam section 82, third seam section 83, fourth seam section 84, fifth seam section 85. DETAILED DESCRIPTION

[0028] The utility model will be further described below in conjunction with the accompanying drawings.

[0029] Embodiment 1:

[0030] Please refer to Figure 1, Figure 1 It is a structural schematic diagram of an embodiment of a battery housing of the utility model. Figure 1 In the illustrated embodiment, the battery housing is enclosed by four side walls (in other embodiments, the number of the side walls is not limited to four). The four side walls include two oppositely disposed first side walls 1 and second side walls 2, two oppositely disposed third side walls 3 and fourth side walls 4, and the first side walls 1, the second side walls 2, the third side walls 3 and the fourth side walls 4 can be together to enclose a shell having a rectangular cross-section. The shell is distributed along the longitudinal direction, and its length is greater than its width. The shell has a cavity 5 that passes through the shell inside, and the cavity 5 is opened along the length direction of the shell. It should be understood that in other embodiments, the shell can also be distributed along the transverse width direction, and its width is greater than its length. Correspondingly, the cavity passes through the shell along the width direction of the shell.

[0031] The first side wall 1, the second side wall 2, the third side wall 3 and the fourth side wall 4 are all formed by bending a plate. In the embodiment shown, the fourth side wall 4 includes a first half side wall 41 and a second half side wall 42 along its length direction. Specifically, the first end of the plate is bent to form the first half side wall 41 of the fourth side wall 4, and the tail end of the plate is bent to form the second half side wall 42 of the fourth side wall 4. The first half side wall 41 and the second half side wall 42 are adjacent and located on the same plane, and a first joint seam 6a is formed between the first half side wall 41 and the second half side wall 42. The first half side wall 41 and the second half side wall 42 are connected together at the first joint seam 6a by welding to form a complete fourth side wall 4, so that the fourth side wall 4 and the first side wall 1, the second side wall 2, and the third side wall 3 are enclosed to form a complete shell with a rectangular cross section.

[0032] On the adjacent two side walls, splicing portions 7a are provided at both ends of the first splicing seam 6a to limit the adjacent two side walls in a splicing state. The splicing portions 7a include a first splicing block 71a arranged at the corresponding end of the first side wall of the adjacent two side walls and a second splicing block 72a arranged at the corresponding end of the second side wall of the adjacent two side walls.

[0033] Please refer to Figure 2In this embodiment, the splicing portion 7a is provided at positions corresponding to the two ends of the first splicing seam 6a on the first half side wall 41 and the second half side wall 42. The splicing portion 7a has two groups provided at the two ends of the length direction of the first splicing seam 6a. Each group of the splicing portion 7a includes a first splicing block 71a provided at the end of the first half side wall 41 and a second splicing block 72a provided at the second half side wall 42. The first splicing block 71a and the second splicing block 72a of each group are located at the same end of the first splicing seam 6a. The first splicing block 71a is formed by the end of the first half side wall 41 protruding outward along the length direction of the first half side wall 41, and the width (i.e., the transverse dimension) of the first splicing block 71 is smaller than the width of the first half side wall 41a. An end surface of the first splicing block 71a close to the second half side wall 42 and an end surface of the first half side wall 41 close to the second half side wall 42 are located on the same plane. The second splicing block 72a is formed by the end portion of the second half side wall 42 protruding outward along the length direction of the second half side wall 42, and the width of the second splicing block 72a is smaller than the width of the second half side wall 42, and an end surface of the second splicing block 72a close to the first half side wall 41 and an end surface of the second half side wall 42 close to the first half side wall 41 are located on the same plane.

[0034] See also Figure 2 , Figure 3 and Figure 4, a second splicing seam 8a is formed between the first splicing block 71a and the second splicing block 72a, and the second splicing seam 8a can be a straight line located on the same straight line as the first splicing seam 6a, or a curved line or a folded line with one end connected to the first splicing seam 6a and the other end connected to the outside. In the illustrated embodiment, a groove 73 with an opening facing the second splicing block 72a is provided on the side of the first splicing block 71a facing the second splicing block 72a, and a convex block 74 that matches the groove 73 is provided on the side of the second splicing block 72a facing the first splicing block 71a. The groove 73 is defined as a dovetail groove with a small mouth and a large bottom, and the shape of the convex block 74 is also a dovetail shape that matches the groove 73. Therefore, after the convex block 74 is matched in the groove 73, the second splicing seam 8a in a folded line is formed. The second joint seam 8a includes a first seam section 81 which is in the same straight line as the first joint seam 6a and is interconnected, a second seam section 82 formed between the first groove wall of the groove 73 and the first side of the protrusion 74, a third seam section 83 formed between the groove bottom wall of the groove 73 and the convex edge of the protrusion 74, a fourth seam section 84 formed between the second groove wall of the groove 73 and the second side of the protrusion 74, and a fifth seam section 85 connected to the third seam section 83 and in the same straight line as the first seam section 81; the fifth seam section 85 penetrates the joint portion 7a outwardly. A first chamfer 75 is provided between the first groove wall and the second groove wall of the groove 73 and an end face of the first joint block 71a close to the second joint block 72a, and a second chamfer 76 is provided at the two end corners of the protrusion 74 extending into the groove 73. The first chamfer 75 and the second chamfer 76 can make it easier for the protrusion 74 to engage with the groove 73.

[0035] Embodiment 2:

[0036] Please refer to Figure 5, this embodiment has a first side wall 1, a second side wall 2, a third side wall 3 and a fourth side wall 4 having the same or similar structure or function as the first embodiment, and the first side wall 1, the second side wall 2, the third side wall 3 and the fourth side wall 4 can enclose together a shell with a rectangular cross section. The shell has a cavity 5 that passes through the shell, and the cavity 5 is opened along the length direction of the shell. The first side wall 1, the second side wall 2, the third side wall 3 and the fourth side wall 4 are all formed by bending a plate. In the embodiment shown, the first end of the plate is bent to form the first side wall 1, and the tail end of the plate is bent to form the second side wall 2. The first side wall 1 and the fourth side wall 4 are adjacent and not located on the same plane. A first joint seam 6b is formed between the first side wall 1 and the fourth side wall 4. The first side wall 1 and the fourth side wall 4 are connected together at the first joint seam 6b by a welding process so that the first side wall 1, the second side wall 2, the third side wall 3 and the fourth side wall 4 enclose a complete shell with a rectangular cross section.

[0037] On the adjacent two side walls, at both ends of the first splicing seam 6b, there are splicing parts 7b for limiting the adjacent two side walls in a splicing state, and each of the splicing parts 7b includes a first splicing block 71b provided at the corresponding end of the first side wall of the adjacent two side walls and a second splicing block 72b provided at the corresponding end of the second side wall of the adjacent two side walls. In this embodiment, the splicing parts 7b are provided at the positions corresponding to the two ends of the first splicing seam 6b on the first side wall 1 and the fourth side wall 4, and each of the splicing parts 7b has two groups provided at both ends of the length direction of the first splicing seam 6b, and each group of the splicing parts 7b includes a first splicing block 71b provided at the end of the first side wall 1 and a second splicing block 72b provided at the fourth side wall 4. The first splicing block 71b and the second splicing block 72b of each group are located at the same end of the first splicing seam 6b, the first splicing block 71b is formed by the end of the first side wall 1 protruding outward along the length direction of the first side wall 1, and the width (i.e., the transverse dimension) of the first splicing block 71b is smaller than the width of the first side wall 1. An end surface of the first splicing block 71b close to the fourth side wall 4 and an end surface of the first side wall 1 close to the fourth side wall 4 are located on the same plane. The second splicing block 72b is formed by the end of the fourth side wall 4 protruding outward along the length direction of the fourth side wall 4, and the width of the second splicing block 72b is smaller than the width of the fourth side wall 4, and an end surface of the second splicing block 72b close to the first side wall 1 and an end surface of the fourth side wall 4 close to the first side wall 1 are located on the same plane. A second splicing seam 8b is formed between the first splicing block 71b and the second splicing block 72b, and the second splicing seam 8b is in a straight line shape located on the same straight line as the first splicing seam 6b.

[0038] The working method of the embodiment 1 of the battery shell of the utility model is as follows: for the embodiment 1, when it is necessary to weld the first splicing seam 6a, the first half side wall 41 is aligned with the second half side wall 42 to form the first splicing seam 6a, and at the same time, the first splicing block 71a and the second splicing block 72a are also in contact on one side close to each other, and the protrusion 74 is inserted into the groove 73 to form a second splicing seam 8a connected to the first splicing seam 6a. The second splicing seam 8a can produce a precise positioning effect for the process of welding the first splicing seam 6a. The staff can keep the first half side wall 41 and the second half side wall 42 in a splicing state by fixing the first splicing block 71a and the second splicing block 72a, so as to avoid directly fixing the first side wall 1, the second side wall 2, the third side wall 3 or the fourth side wall 4, which may cause damage to the finished product of the battery shell. At the same time, the protrusion 74 is also snapped into the groove 73. The engagement of the protrusion 74 and the groove 73 can prevent the first half side wall 41 and the second half side wall 42 from expanding outward when welding the plate, so as to avoid the problem of feeding swing and poor welding yield caused by the first half side wall 41 and the second half side wall 42 not forming a flat surface. When the welding is completed, the two splicing parts 7a are cut out by laser or stamping, leaving only the processed rectangular shell. The working method of the second embodiment of the utility model is similar to that of the first embodiment, so it will not be repeated here.

Claims

1. A battery housing, formed by enclosing a plurality of side walls, with a first joint seam formed between adjacent side walls, and welding at the first joint seam to connect the two adjacent side walls together, characterized in that: Splicing parts are provided on the adjacent two side walls at both ends of the first splicing seam, and the splicing parts limit the adjacent two side walls in a splicing state.

2. The battery housing according to claim 1, characterized in that: The two adjacent side walls are located in different planes; and the two adjacent side walls form a predetermined angle after being spliced.

3. The battery housing according to claim 1, characterized in that: The two adjacent side walls are located in the same plane.

4. The battery housing according to claim 1, wherein: The first joint seam is formed between any two adjacent side walls.

5. The battery housing according to claim 1, wherein: The splicing portion includes a first splicing block arranged at a corresponding end of a first side wall of two adjacent side walls and a second splicing block arranged at a corresponding end of a second side wall of the two adjacent side walls.

6. The battery housing according to claim 5, characterized in that: The first assembling block and the second assembling block both protrude from the end sides of the corresponding side walls; The lateral dimensions of the first and second splicing blocks are both smaller than the lateral dimensions of the corresponding side walls, and the first splicing block is located on a side of the first side wall close to the second side wall, and the second splicing block is located on a side of the second side wall close to the first side wall.

7. The battery housing according to claim 5, characterized in that: A second splicing seam is formed between the first splicing block and the second splicing block; The second joint seam and the first joint seam are located on the same straight line; or The second joint seam is in a curve shape and / or a fold line shape.

8. The battery housing according to claim 7, characterized in that: A groove opening toward the second splicing block is provided on the side of the first splicing block facing the second splicing block, and a convex block matching with the groove is provided on the side of the second splicing block facing the first splicing block, and the convex block is matched with the groove to form the second splicing seam in a folded line shape; The groove is defined as a dovetail groove with a small mouth and a large bottom, and the shape of the protrusion is adapted to the shape of the dovetail groove.

9. The battery housing according to claim 8, characterized in that: The second splicing seam includes a first seam section located in the same straight line as the first splicing seam and connected to each other, a second seam section formed between the first groove wall of the groove and the first side edge of the protrusion, a third seam section formed between the groove bottom wall of the groove and the convex edge of the protrusion, a third seam section formed between the second groove wall of the groove and the second side edge of the protrusion, and a fourth seam section connected to the third seam section and located in the same straight line as the first seam section; the fourth seam section runs through the splicing portion outwardly.

10. The battery housing according to any one of claims 1 to 9, characterized in that: The invention comprises two oppositely disposed first side walls and a second side wall, and two oppositely disposed third side walls and a fourth side wall, wherein the first side wall, the second side wall, the third side wall and the fourth side wall together form a shell having a rectangular cross section, and the shell has a through cavity; the first joint seam may be defined as being formed between the first side wall and the third side wall, between the first side wall and the fourth side wall, between the second side wall and the third side wall and / or between the second side wall and the fourth side wall; or The first side wall, the second side wall, the third side wall and the fourth side wall are all formed by bending a plate. The first half side wall of one of the side walls is formed after the head end of the plate is bent, and the second half side wall of one of the side walls is formed at the tail end of the plate. The first half side wall and the second half side wall are spliced ​​on the same plane to form a complete one of the side walls; the first half side wall and the second half side wall are adjacent to each other and the first splicing seam is formed therebetween, and the splicing parts are provided at both ends of the first half side wall and the second half side wall.

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