Battery case and battery

Abstract

The utility model relates to power battery technical field provides a kind of battery shell and battery.The battery shell includes shell body and joint structure;Shell body is formed by bending metal sheet material, and two joint edges of shell body are formed by bending and are oppositely arranged and are welded connection;Joint structure is located between two joint edges, and joint structure includes multiple joint units arranged at interval along the length direction of joint edge, and joint unit includes joint convex part and joint concave part matched with each other, in each joint unit, joint convex part is located in one joint edge, and joint concave part is located in another joint edge.The battery shell and battery provided by the utility model can significantly improve the length of weld by using the cooperation of joint convex part and joint concave part in multiple joint units, thereby improving the strength of weld, and at the same time, the cooperation of joint convex part and joint concave part can avoid weld stress concentration on a single straight line, effectively avoid fatigue cracks in weld, and also improve the sealing performance of shell body.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a battery casing and a battery. Background Technology

[0002] The casing of a power battery is an important component of the battery, and its main functions include protecting the battery electrode assembly, providing structural support, heat dissipation, and ensuring battery safety.

[0003] In existing technologies, the casing of a power battery is typically made by bending a metal sheet into a predetermined shape, and then welding the two free edges of the bent sheet together to ensure the casing's sealing performance. However, in existing systems, both free edges of the bent sheet are straight, resulting in low weld strength and poor sealing performance after welding. Utility Model Content

[0004] This utility model provides a battery casing and a battery to solve the defects in the prior art, such as low weld strength and poor sealing performance after the battery casing is welded.

[0005] This utility model provides a battery casing, including: a casing body and a joining structure.

[0006] The housing body is formed by bending a metal sheet, and the bending of the housing body forms two opposing and welded joint edges; the joint structure is disposed between the two joint edges, and the joint structure includes a plurality of joint units spaced apart along the length direction of the joint edges, the joint unit including a joint protrusion and a joint recess that cooperate with each other, in each joint unit, the joint protrusion is disposed on one of the joint edges, and the joint recess is disposed on the other joint edge.

[0007] According to the battery casing provided by this utility model, the spacing between adjacent joining units is the same, so that the plurality of joining units are evenly spaced along the length direction of the joining edge.

[0008] According to the battery housing provided by this utility model, in all the said joining units, the joining protrusions have the same shape, and the joining recesses have the same shape.

[0009] According to the battery casing provided by this utility model, the spacing between at least some of the adjacent joining units is different.

[0010] According to the battery casing provided by this utility model, at least some of the joining units have different shapes of the joining protrusions.

[0011] According to the battery casing provided by this utility model, along the length direction of the joint edge, the outer length of the joint protrusion and the joint recess at both ends is greater than the outer length of the joint protrusion and the joint recess at the middle.

[0012] According to the battery housing provided by this utility model, all the joint protrusions are located on the same joint edge, and all the joint recesses are located on another joint edge.

[0013] According to the battery housing provided by this utility model, at least a portion of the engagement protrusion and at least a portion of the engagement recess are located on the same engagement edge.

[0014] According to the battery casing provided by this utility model, the joining protrusion is a rectangular protrusion, a triangular protrusion, or an arc-shaped protrusion, and the joining recess is a rectangular recess, a triangular recess, or an arc-shaped recess.

[0015] Another aspect of this utility model provides a battery, including: a battery casing, a top cover, and a battery electrode assembly.

[0016] The battery casing has ports at both ends along its length; each port has a top cover; the battery electrode assembly is located inside the battery casing.

[0017] The battery casing and battery provided by this utility model form multiple joint units spaced apart along the length direction between two joint edges of the casing body. The cooperation of the joint protrusions and joint recesses in the multiple joint units can significantly increase the weld length, thereby improving the weld strength. At the same time, the cooperation of the joint protrusions and joint recesses can avoid the weld stress concentration on a single straight line, which can effectively prevent fatigue cracks in the weld and also improve the sealing performance of the casing body.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is one of the schematic diagrams of the housing body in the battery housing provided in one embodiment of the present utility model.

[0021] Figure 2 yes Figure 1 A magnified view of part A in the diagram.

[0022] Figure 3 This is the second schematic diagram of the battery casing body provided in one embodiment of the present utility model.

[0023] Figure 4 This is a schematic diagram of the battery casing body provided in the second embodiment of this utility model.

[0024] Figure 5 This is a schematic diagram of the battery casing body provided in Embodiment 3 of this utility model.

[0025] Figure 6 This is a schematic diagram of the battery casing body provided in Embodiment 4 of this utility model.

[0026] Figure 7 This is a schematic diagram of the battery casing body provided in Embodiment 5 of this utility model.

[0027] Figure 8 This is a schematic diagram of the battery casing body provided in Embodiment 6 of this utility model.

[0028] Figure label: 100. Housing body; 110. Joining edge; 200. Joining structure; 210. Joining unit; 211. Joining protrusion; 212. Joining recess. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0032] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0034] The following is combined with Figures 1 to 8 This invention describes the battery casing and battery provided by this utility model.

[0035] See Figures 1 to 3 As shown, the battery casing provided in this embodiment of the present invention includes: a casing body 100 and a joining structure 200.

[0036] The housing body 100 is formed by bending a metal sheet, and the housing body 100 is bent to form two opposing and welded joint edges 110; the joint structure 200 is disposed between the two joint edges 110, and the joint structure 200 includes a plurality of joint units 210 spaced apart along the length direction of the joint edges 110. The joint unit 210 includes a joint protrusion 211 and a joint recess 212 that cooperate with each other. In each joint unit 210, the joint protrusion 211 is disposed on one of the joint edges 110, and the joint recess 212 is disposed on the other joint edge 110.

[0037] The battery casing and battery provided by this utility model form a plurality of joint units 210 spaced apart along the length direction between two joint edges 110 of the casing body 100. The cooperation of the joint protrusions 211 and joint recesses 212 in the plurality of joint units 210 can significantly increase the weld length, thereby improving the weld strength. At the same time, the cooperation of the joint protrusions 211 and joint recesses 212 can avoid the weld stress concentration on a single straight line, effectively preventing fatigue cracks in the weld and improving the sealing performance of the casing body 100.

[0038] Specifically, the joining structure 200 includes a plurality of joining units 210 spaced apart along the length of the joining edge 110. Each joining unit 210 includes a matching joining protrusion 211 and a joining recess 212. The plurality of joining units 210 may be spaced apart along the length of the joining edge 110 in a uniform or non-uniform manner, and there is no particular limitation thereto.

[0039] For example, when multiple joining units 210 are evenly spaced along the length of the joining edge 110, the joining protrusions 211 and joining recesses 212 in all joining units 210 have the same shape and size, and the spacing between adjacent joining units 210 is the same.

[0040] When multiple joining units 210 are spaced apart in a non-uniform manner along the length direction of the joining edge 110, there are various methods. For example, the spacing between at least some of the joining units 210 is different, or the shape and / or size of the joining protrusions 211 and joining recesses 212 in at least some of the joining units 210 are different.

[0041] It should be noted that in different joining units 210, the joining protrusions 211 can be located on the same joining edge 110 or on different joining edges 110. That is, there are two cases: first, the joining protrusions 211 of all joining units 210 are located on the same joining edge 110, and the joining recesses 212 of all joining units 210 are located on another joining edge 110; second, the joining protrusions 211 of some joining units 210 and the joining recesses 212 of the remaining joining units 210 are located on the same joining edge 110.

[0042] As described above, the arrangement of the various joining units 210, as well as the positions of the joining protrusions 211 and joining recesses 212 in the joining units 210, can be configured according to actual needs, and no specific limitations are imposed. For example, if the battery casing requires better sealing (e.g., waterproof or dustproof design), the joining units 210 can be evenly spaced to ensure that each part of the joining edge 110 is uniformly welded, thereby improving the overall sealing effect and avoiding gaps caused by uneven distribution of the joining units 210. In some applications that require the battery to work for a long time and avoid weld cracks due to fatigue (such as high-frequency charging and discharging equipment), the joining units 210 can be non-uniformly spaced. In high-stress areas, the number of joining units 210 can be increased or the shape and size of the protrusions and recesses can be adjusted to reduce stress concentration and avoid the generation of fatigue cracks.

[0043] In each joining unit 210, the outer contours of the joining protrusion 211 and the joining recess 212 are matched. For example, when the joining protrusion 211 is a rectangular protrusion, the joining recess 212 is a rectangular recess; when the joining protrusion 211 is a triangular protrusion, the joining recess 212 is a triangular recess; and when the joining protrusion 211 is an arc-shaped protrusion, the joining recess 212 is an arc-shaped recess.

[0044] See Figures 1 to 3 As shown, according to some embodiments of the present invention, the spacing between adjacent joining units 210 is the same, so that multiple joining units 210 are evenly spaced along the length direction of the joining edge 110.

[0045] By evenly spacing multiple joining units 210 along the length of the joining edge 110, the welding force distribution of the joining structure 200 along the entire joining edge 110 can be ensured, effectively improving the overall strength and stability of the joining edge 110 after welding and avoiding joint failure or structural deformation caused by uneven local welding force. In applications with stringent requirements for battery casing sealing and structural stability, such as battery casings for new energy vehicles, the evenly spaced joining units 210 can fully ensure the reliability and durability of the casing.

[0046] See Figures 1 to 3 As shown, according to some embodiments of the present invention, in all the joining units 210, the joining protrusions 211 have the same shape, and the joining recesses 212 have the same shape.

[0047] By setting the shapes of the joining protrusions 211 and the joining recesses 212 in all joining units 210 to be identical, a high degree of consistency in the joining units 210 can be achieved. After welding, the uniformity of stress distribution in the weld can be significantly improved. At the same time, it can also simplify the production process, making mold design and manufacturing simpler in the bending process of metal sheets.

[0048] Specifically, after welding, since the geometry and size of the weld area corresponding to each joint unit 210 are consistent, the distribution of mechanical stress on the entire joint edge 110 is more uniform, which can improve the fatigue resistance and fracture resistance of the weld.

[0049] See Figure 4 As shown, according to some embodiments of the present invention, at least some of the adjacent joining units 210 have different spacing.

[0050] By setting the spacing of at least adjacent joint units 210 to be different, the mechanical properties of the joint structure 200 after welding can be optimized to a certain extent. For example, in some high-load areas (such as the area near the port of the housing body 100), by appropriately shortening the spacing between the joint units 210, the weld strength in the high-load area can be improved, thereby improving the deformation resistance of the high-load area; while in other low-load areas (such as the middle area of ​​the housing body 100) where the stress is lighter, the spacing of the joint units 210 can be appropriately increased.

[0051] See Figure 4 As shown in the figure, as an example, in this embodiment, the joining structure 200 includes a plurality of joining units 210 groups spaced apart along the length direction of the joining edge 110. Each joining unit 210 group includes a plurality of joining units 210 spaced apart, and the spacing between adjacent joining unit 210 groups is greater than the spacing between adjacent joining units 210 within the same joining unit 210. The arrangement of the plurality of joining units 210 as described above can improve the weld strength at the position of the housing body 100 near the port after welding.

[0052] See Figure 5 As shown, according to some embodiments of the present invention, at least some of the joining units 210 have different shapes for the joining protrusions 211.

[0053] By designing the shape of the engagement protrusion 211 in at least some of the engagement units 210 to be different, flexible adjustments can be made to meet different load requirements and welding process adaptability, so as to meet diverse engineering needs.

[0054] Specifically, in some battery casing structures, the stress conditions in different areas of the joint edge 110 may vary significantly. For example, in areas subjected to large battery electrode expansion forces, it is necessary to strengthen the joint area. In this case, the local load-bearing capacity can be optimized by designing joint protrusions 211 with different shapes.

[0055] See Figure 5 As shown in the example, in this embodiment, the joining protrusion 211 in the joining unit 210 near the two side ports of the joining edge 110 is a rectangular protrusion, while the joining protrusion 211 in the joining unit 210 located in the middle of the joining edge 110 is a triangular protrusion. Since the top cover needs to be interferometry-fitted into the battery casing near the two side ports, which is a high-load area, setting the joining protrusion 211 in this area as a rectangular protrusion ensures a simple structure and facilitates die stamping while extending the weld length. Simultaneously, since the load on the middle area of ​​the joining edge 110 is smaller than that on the two side ports, in this example, setting the joining protrusion 211 in the joining unit 210 located in the middle of the joining edge 110 as a triangular protrusion appropriately shortens the weld length while ensuring weld strength.

[0056] See Figure 6 As shown, according to some embodiments of the present invention, along the length direction of the joint edge 110, the outer contour length of the joint protrusion 211 and the joint recess 212 located at both ends is greater than the outer contour length of the joint protrusion 211 and the joint recess 212 located in the middle.

[0057] By setting the outer contour lengths of the joint protrusions 211 and joint recesses 212 located at both ends of the joint edge 110 to be greater than the outer contour lengths of the joint protrusions 211 and joint recesses 212 in the middle, flexible adjustments can be made to meet different load requirements and welding process adaptability to satisfy diverse engineering needs.

[0058] Specifically, in some battery casing structures, the stress conditions in different areas of the joint edge 110 may vary significantly. For example, in areas subjected to greater battery electrode expansion forces, the strength of the joint area needs to be reinforced. In this case, the local load-bearing capacity can be optimized by designing joint protrusions 211 with different outer contour lengths. Since the top cover needs to be interferometrically fitted near the two side ports of the battery casing, which is a high-load area, and the area of ​​the joint edge 110 in the middle bears a smaller load compared to the two side ports, by setting the outer contour length of the joint protrusions 211 and joint recesses 212 at both ends of the joint edge 110 to be greater than the outer contour length of the joint protrusions 211 and joint recesses 212 in the middle, the weld length can be minimized while meeting the weld strength requirements, avoiding the processing complexity and increased cost caused by excessively long welds.

[0059] See Figure 3As shown, according to some embodiments of the present invention, all the joint protrusions 211 are located on the same joint edge 110, and all the joint recesses 212 are located on another joint edge 110.

[0060] By placing all the engagement protrusions 211 on the same engagement edge 110 and all the engagement recesses 212 on another engagement edge 110, the design of the engagement structure 200 can be effectively simplified, reducing the complexity of the manufacturing process.

[0061] For example, since the layout of the engagement protrusion 211 and engagement recess 212 is more uniform and symmetrical, the mold structure for stamping the shell sheet can be simplified, avoiding complex mold structures and precision requirements, thereby reducing the difficulty and cost of mold manufacturing.

[0062] Of course, to meet the practical application requirements of the battery casing, in some embodiments, at least part of the engagement protrusion 211 and at least part of the engagement recess 212 may be provided on the same engagement edge 110, see [reference]. Figure 7 As shown.

[0063] See Figure 3 , Figure 5 or Figure 8 As shown, according to some embodiments of the present invention, the joining protrusion 211 is a rectangular protrusion, a triangular protrusion, or an arc-shaped protrusion, and the joining recess 212 is a rectangular recess, a triangular recess, or an arc-shaped recess.

[0064] By setting the joint protrusion 211 and the joint recess 212 to rectangular, triangular or arc shapes, the joint structure 200 is kept simple in shape and easy to process and manufacture, while ensuring the strength and sealing performance of the weld structure after welding.

[0065] The battery provided by this utility model is described below. The battery described below and the battery casing described above can be referred to in correspondence.

[0066] The battery provided in this embodiment includes: a battery casing, a top cover, and a battery electrode assembly. The battery casing has ports at both ends along its length, and each port has a top cover. The battery electrode assembly is disposed inside the battery casing.

[0067] The battery provided by this utility model, by adopting the battery casing as described in any of the previous embodiments, can also significantly increase the weld length by utilizing the cooperation of the joint protrusions 211 and joint recesses 212 in the multiple joint units 210, thereby improving the weld strength. At the same time, the cooperation of the joint protrusions 211 and joint recesses 212 can avoid the weld stress concentration on a single straight line, effectively preventing fatigue cracks in the weld and improving the sealing performance of the casing body 100.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery casing, characterized in that, include: The housing body is formed by bending a metal sheet, and the bending of the housing body forms two opposing and welded joint edges; A joining structure is provided between two joining edges. The joining structure includes a plurality of joining units spaced apart along the length direction of the joining edges. Each joining unit includes a joining protrusion and a joining recess that cooperate with each other. In each joining unit, the joining protrusion is provided on one of the joining edges, and the joining recess is provided on the other joining edge.

2. The battery casing according to claim 1, characterized in that, The spacing between adjacent joining units is the same, so that the plurality of joining units are evenly spaced along the length direction of the joining edge.

3. The battery casing according to claim 1, characterized in that, In all the aforementioned joining units, the joining protrusions have the same shape, and the joining recesses have the same shape.

4. The battery casing according to claim 1, characterized in that, The spacing between at least some of the adjacent joining units is different.

5. The battery casing according to claim 1, characterized in that, In at least some of the said joining units, the shape of the joining protrusions is different.

6. The battery casing according to claim 1, characterized in that, Along the length direction of the joint edge, the outer length of the joint protrusion and the joint recess at both ends is greater than the outer length of the joint protrusion and the joint recess at the middle.

7. The battery casing according to claim 1, characterized in that, All the said engagement protrusions are located on the same said engagement edge, and all the said engagement recesses are located on another said engagement edge.

8. The battery casing according to claim 1, characterized in that, At least a portion of the engagement protrusion and at least a portion of the engagement recess are located on the same engagement edge.

9. The battery casing according to claim 1, characterized in that, The joining protrusion is a rectangular protrusion, a triangular protrusion, or an arc-shaped protrusion, and the joining recess is a rectangular recess, a triangular recess, or an arc-shaped recess.

10. A battery, characterized in that, include: The battery casing as described in any one of claims 1 to 9, wherein the battery casing has ports at both ends along its length; Top cover, each of the ports is provided with a top cover; A battery electrode assembly, wherein the battery electrode assembly is disposed within the battery casing.

Images