Top cover assembly of battery and vehicle

Abstract

The utility model relates to a top cover assembly of a battery and a vehicle, the top cover assembly of the battery comprises pole columns, a connecting plate and a connecting assembly, the connecting plate and the connecting assembly are sequentially arranged in a stacked mode, the connecting plate corresponds to the two pole columns, and each pole column comprises a first column section and a second column section which are sequentially connected in the length direction of the pole column; the connecting assembly is provided with an open hole allowing the first column section to penetrate through, the first wall face, facing the connecting assembly, of the connecting plate is provided with a groove matched with the first column section in an inserted mode, and the outer circumferential wall of the first column section is matched with the inner circumferential wall of the groove. And at least part of the outer peripheral wall of the first column section is connected with the corresponding position of the inner peripheral wall of the groove in a welding manner. According to the design, the occupation of a chip welding area on the connecting plate caused by a riveting mode is avoided, the chip welding area is greatly increased, the resistance of a welding position is reduced, in addition, after the welding area is increased, the current bearing capacity is high, and the temperature rise can be reduced to a certain extent.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery top cover assembly and a vehicle. Background Technology

[0002] A battery typically includes a casing, battery cells housed within the casing, and a top cover assembly covering the casing. The top cover assembly includes a connecting plate and terminals. The terminals are fixedly connected to the connecting plate by riveting.

[0003] The above connection method has the following drawbacks: the riveting process involves complex assembly steps, is difficult to operate, and makes it hard to control product quality. Furthermore, because the riveting circle has a large diameter, it occupies the welding area between the connecting plate and the electrode, limiting the welding area and resulting in a smaller current-carrying area for the battery cell, leading to poor heat conduction and excessively high temperatures. Utility Model Content

[0004] Therefore, it is necessary to provide a top cover assembly for the battery that avoids occupying the area for welding the battery plate.

[0005] This application provides a top cover assembly for a battery, including terminals and a connecting plate and a connecting assembly arranged in sequence. The connecting plate corresponds to two terminals. Each terminal includes a first segment and a second segment connected in sequence along its length. The connecting assembly has an opening for the first segment to pass through. The connecting plate has a groove on its first wall facing the connecting assembly that is inserted into the first segment. The outer peripheral wall of the first segment matches the inner peripheral wall of the groove, and at least a portion of the outer peripheral wall of the first segment is connected to the corresponding position of the inner peripheral wall of the groove by welding.

[0006] In one embodiment, the two pole posts are arranged at intervals along a first direction, the cross-sectional area of ​​the first pole post is smaller than that of the second pole post, and the outer peripheral wall of the first pole post includes two first straight walls and a connecting wall connecting the two first straight walls. The first straight walls and the connecting wall are arranged sequentially along the circumference of the first pole post, and the two first straight walls are arranged at intervals relative to each other along a second direction that intersects the first direction. The first sidewall of the groove that matches the first straight wall is connected to the first straight wall by welding.

[0007] In one embodiment, the first straight wall extends along the first direction.

[0008] In one embodiment, the connecting assembly includes a first plastic plate, the periphery of which extends toward the connecting plate to form a flange, the flange having a first clearance groove at a position corresponding to the first straight wall, the first clearance groove extending along the length direction of the first straight wall.

[0009] In one embodiment, each pole post includes two oppositely arranged connecting walls, the connecting walls of the two pole posts being a second straight wall extending along the second direction, and the second sidewall of the groove matching the second straight wall being connected to the second straight wall by welding.

[0010] In one embodiment, the connecting assembly includes a first plastic plate, the periphery of which extends toward the connecting plate to form a flange, the flange having a first clearance groove at a position corresponding to the first straight wall and a second clearance groove at a position corresponding to the second straight wall, the first clearance groove extending along the length direction of the first straight wall and the second clearance groove extending along the length direction of the second straight wall.

[0011] In one embodiment, the connecting plate is a square plate, the first direction is the length direction of the connecting plate, and the first straight wall extends along the length direction of the connecting plate.

[0012] In one embodiment, the connecting assembly further includes a cover plate and a second plastic plate arranged in sequence, the cover plate being located between the first plastic plate and the second plastic plate, the first plastic plate, the cover plate and the second plastic plate having corresponding openings, and a sealing ring being provided in the opening, the sealing ring being at least sleeved around the periphery of the second column segment.

[0013] In one embodiment, the length of the first column segment is H1, and the depth of the groove is H2, wherein the length H1 and the depth H2 satisfy: H1 < H2.

[0014] In one embodiment, the connecting plate has a first region for welding with a bar sheet, the first region extending along the first direction.

[0015] In one embodiment, the end face of the first column segment away from the second column segment is connected to the corresponding position of the connecting plate by welding.

[0016] In one embodiment, the area where the groove is welded to the end face of the first column segment is defined as the second region, and there are at least two first regions, with the second region located between the two first regions.

[0017] This application also provides a vehicle including a battery, the battery including a top cover assembly and a plate, the top cover assembly being the top cover assembly described in any of the above embodiments, the plate being connected to the connecting plate by welding and electrically connected to the two terminals.

[0018] Compared with the prior art, in the top cover assembly of the battery provided in this application, the first column of the electrode post and the groove of the connecting plate are welded together, which avoids the occupation of the welding area of ​​the connecting plate caused by riveting, greatly increases the welding area of ​​the electrode, reduces the resistance at the welding position, and furthermore, due to the increased welding area, the current carrying capacity is strong, which can reduce the temperature rise to a certain extent. Attached Figure Description

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

[0020] Figure 1 This is a perspective view of a top cover assembly according to an embodiment of this application;

[0021] Figure 2 for Figure 1 The top cover assembly is shown in front view.

[0022] Figure 3 for Figure 2 A magnified view of a section at point I;

[0023] Figure 4 for Figure 1 An exploded view of the top cover assembly is shown.

[0024] Figure 5 for Figure 1 A cross-sectional view of the top cover assembly is shown;

[0025] Figure 6 for Figure 5 Enlarged view of section II in the middle;

[0026] Figure 7 for Figure 1 The diagram shows the structure of the connecting plate in the top cover assembly;

[0027] Figure 8 for Figure 7 A top view of the connecting plate is shown;

[0028] Figure 9 for Figure 7 The bottom view of the connecting plate is shown;

[0029] Figure 10 for Figure 7 A cross-sectional view of the connecting plate is shown;

[0030] Figure 11 for Figure 1The diagram shows the structural schematic of the pole in the top cover assembly;

[0031] Figure 12 for Figure 11 The top view of the pole is shown;

[0032] Figure 13 for Figure 11 The right view of the pole shown;

[0033] Figure 14 for Figure 1 The diagram shows the structure of the first plastic sheet.

[0034] Figure 15 This is a bottom view of the connecting plate in another embodiment of this application;

[0035] Figure 16 This is a schematic diagram of the pole structure in another embodiment of this application.

[0036] Reference numerals: 1. Pole post; 11. First column segment; 111. First straight wall; 112. Arc-shaped wall; 113. Second straight wall; 114. End face; 12. Second column segment; 13. Extension plate; 2. Connecting plate; 2a. First wall surface; 2b. Second wall surface; 21. Groove; 211. First side wall; 212. Second side wall; 213. Third side wall; 22. Second region; 23. First region; 3. Connecting assembly; 30. Opening; 31. First plastic plate; 311. Flange; 3111. First clearance groove; 3112. Second clearance groove; 33. Cover plate; 34. Second plastic plate; 4. Sealing ring. Detailed Implementation

[0037] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0038] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," "side," "top," "bottom," and similar expressions used in this application's specification are merely for describing various exemplary structural parts and elements of this application. However, their use herein is for illustrative purposes only and is determined based on the exemplary orientations shown in the accompanying drawings, and does not represent the only possible implementation. Since the embodiments disclosed in this application can be arranged in different orientations, these terms indicating orientation are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this application, unless otherwise expressly 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 and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates 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 indicates that the first feature is at a lower horizontal level than the second feature.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0042] Please see Figures 1 to 16 This application provides a top cover assembly for a battery, which includes a terminal post 1 and a connecting plate 2 and a connecting component 3 arranged in sequence. The connecting plate 2 and the connecting component 3 are arranged in a stacking direction C, which is the height direction of the top cover assembly. Figure 4 As shown, the connecting plate 2 has two pole posts 1, which are arranged at intervals along the first direction A. The first direction A intersects the stacking direction C.

[0043] The aforementioned top cover assembly is used in a battery, which includes the top cover assembly and a battery plate. The battery plate is connected to the connecting plate 2 by welding and is electrically connected to the two terminals 1. This battery is used in vehicles, such as passenger cars.

[0044] The two pole posts 1 described above have the same structure; we will use one of pole posts 1 as an example for explanation. Figure 6 , Figure 9 and Figure 11 As shown, the pole post 1 includes a first pole segment 11 and a second pole segment 12 connected sequentially along its length. The connecting assembly 3 has an opening 30 through which the first pole segment 11 passes. The connecting plate 2 has a groove 21 on its first wall surface 2a facing the connecting assembly 3, which engages with the first pole segment 11; that is, the groove 21 is a blind groove. The outer peripheral wall of the first pole segment 11 matches the inner peripheral wall of the groove 21, and at least a portion of the outer peripheral wall of the first pole segment 11 is connected to the corresponding position of the inner peripheral wall of the groove 21 by welding.

[0045] It is understandable that the first column segment 11 of the pole post 1 is welded to the groove 21 of the connecting plate 2, which avoids the occupation of the welding area of ​​the plate on the connecting plate 2 caused by riveting. This greatly increases the welding area of ​​the plate and reduces the resistance at the welding position. In addition, since the welding area is increased, the current carrying capacity is stronger, which can reduce the temperature rise to a certain extent.

[0046] The welding area of ​​the connecting plate in this application can be increased by about 47% while keeping the external dimensions of the connecting plates in other top cover assemblies unchanged.

[0047] In one embodiment, the cross-sectional area of ​​the first column segment 11 and the cross-sectional area of ​​the second column segment 12 are equal. In this embodiment, as... Figure 11 As shown, the cross-sectional area of ​​the first column segment 11 is smaller than the cross-sectional area of ​​the second column segment 12.

[0048] In one implementation, such as Figure 4 , Figures 8-13 The outer peripheral wall of the first column segment 11 shown includes two first straight walls 111 arranged opposite to each other and two connecting walls arranged opposite to each other. The first straight walls 111 and the connecting walls are arranged sequentially along the circumference of the first column segment 11. The direction intersecting the first direction A is defined as the second direction B. The two first straight walls 111 are arranged at intervals along the second direction B. The two connecting walls are arranged at intervals along the first direction A, and the two ends of the connecting walls are respectively connected to the two ends of the corresponding first straight walls 111, that is, the connecting walls connect the two first straight walls 111.

[0049] In one implementation, such as Figure 11 As shown, the first straight wall 111 extends along the first direction A. The connecting plate 2 is a square plate. In one embodiment, the first direction A is a direction that intersects the length direction of the connecting plate 2 and is not the width direction of the square plate, and the second direction B is the width direction of the square plate, or a direction other than the width and length directions of the square plate. In this embodiment, as... Figure 4 As shown, the first direction A is the length direction of the connecting plate 2, and the second direction B is the width direction of the connecting plate 2. At this time, the two pole posts 1 are arranged at intervals along the length direction of the connecting plate 2, the two first straight walls 111 are arranged at intervals along the width direction of the connecting plate 2, the two connecting walls are arranged at intervals along the length direction of the connecting plate 2, and the first straight wall 111 extends along the length direction of the connecting plate 2.

[0050] In one implementation, such as Figure 10 , Figure 11 , Figure 14 and Figure 15 As shown, the first sidewall 211, which matches the first vertical wall 111, is connected to the first vertical wall 111 by welding. This improves the strength of the connection between the pole and the connecting plate, and enhances torsional resistance. The connecting assembly 3 includes a first plastic plate 31, with a flange 311 extending from the periphery of the first plastic plate 31 towards the connecting plate 2. The flange 311 has a first clearance groove 3111 at a position corresponding to the first vertical wall 111, and the first clearance groove 3111 extends along the length of the first vertical wall 111.

[0051] In one implementation, such as Figure 9 and Figure 11 As shown, both connecting walls of the pole post 1 are arc-shaped walls 112, and the third side wall 213 of the groove 21, which matches the arc-shaped wall 112, is also arc-shaped.

[0052] In one implementation, such as Figure 15 and Figure 16 As shown, the connecting wall of the two pole posts 1, away from each other, is a second straight wall 113 extending along the second direction B, that is, the second straight wall 113 extends along the width direction of the connecting plate 2. The two second straight walls 113 are arranged at intervals along the length direction of the connecting plate 2. The second side wall 212 of the groove 21, which matches the second straight wall 113, is also a straight wall, and the second side wall 212 is connected to the second straight wall 113 by welding. Figure 14 As shown, the flange 311 has a second clearance groove 3112 at the position corresponding to the second straight wall 113, and the second clearance groove 3112 extends along the length direction of the second straight wall 113. In another embodiment, both connecting walls of each pole post 1 are straight walls.

[0053] Understandably, the connection wall adopts the second straight wall 113 method, which increases the flow area compared to the curved wall method.

[0054] In one implementation, such as Figure 6 , Figure 11 and Figure 16 As shown, the end face 114 of the first column segment 11 away from the second column segment 12 is connected to the corresponding position of the connecting plate 2 by welding. It can be understood that when it is necessary to further increase the flow area, the end face of the first column segment 11 can be welded to the connecting plate 2.

[0055] like Figures 6-8 As shown, the connecting plate 2 has a first region 23 for welding with the plate, and the region where the connecting plate 2 is welded to the end face 114 of the first column segment 11 is defined as the second region 22. Both the first region 23 and the second region 22 extend along the first direction A, and there are at least two first regions 23, with the second region 22 located between the two first regions 23. The first region 23 is located on the second wall surface 2b of the connecting plate 2 facing away from the groove.

[0056] In one implementation, such as Figures 4-6 As shown, the connecting assembly 3 includes, in addition to the first plastic plate 31, a cover plate 33 and a second plastic plate 34 arranged in sequence. The cover plate 33 is located between the first plastic plate 31 and the second plastic plate 34. The first plastic plate 31, the cover plate 33, and the second plastic plate 34 are respectively provided with openings 30. A sealing ring 4 is provided in the opening 30. The sealing ring 4 is at least fitted around the second column segment 12. That is, it can be fitted only around the second column segment 12, or it can be fitted around both the first column segment and the second column segment 12. Each pole post 1 corresponds to one sealing ring 4. The second column segment 12 of the pole post 1 is provided with an extension plate 13 extending along the first direction A at the end away from the first column segment 11. The cover plate 33 assembly is located between the connecting plate 2 and the extension plate 13.

[0057] like Figure 10 and Figure 13 As shown, the length of the first column segment 11 is H1, and the depth of the groove 21 is H2. The length H1 and the depth H2 satisfy: H1 < H2. It can be understood that when the length of the first column segment 11 is less than the depth of the groove 21, it is convenient to control the compression of the sealing ring 4.

[0058] The welding methods described in the above embodiments are all laser welding. Other welding methods commonly used in battery top cover assemblies can also be used, but will not be described in detail in this embodiment.

[0059] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A top cover assembly for a battery, characterized in that, The assembly includes poles (1) and connecting plates (2) and connecting components (3) arranged in sequence. The connecting plate (2) corresponds to two poles (1). Each pole (1) includes a first column segment (11) and a second column segment (12) connected in sequence along its own length. The connecting component (3) has an opening (30) through which the first column segment (11) passes. The connecting plate (2) has a groove (21) on its first wall surface (2a) facing the connecting component (3) that is inserted and fitted with the first column segment (11). The outer peripheral wall of the first column segment (11) matches the inner peripheral wall of the groove (21), and at least a portion of the outer peripheral wall of the first column segment (11) is connected to the corresponding position of the inner peripheral wall of the groove (21) by welding.

2. The top cover assembly according to claim 1, characterized in that, Two pole posts (1) are arranged at intervals along a first direction. The cross-sectional area of ​​the first column segment (11) is smaller than that of the second column segment (12). The outer peripheral wall of the first column segment (11) includes two first straight walls (111) and a connecting wall connecting the two first straight walls (111). The first straight walls (111) and the connecting wall are arranged sequentially along the circumference of the first column segment (11). The two first straight walls (111) are arranged at intervals relative to each other along a second direction that intersects the first direction. The first side wall (211) of the groove (21) that matches the first straight wall (111) is connected to the first straight wall (111) by welding.

3. The top cover assembly according to claim 2, characterized in that, The first straight wall (111) extends along the first direction.

4. The top cover assembly according to claim 2, characterized in that, The connecting component (3) includes a first plastic plate (31), and a flange (311) is formed on the periphery of the first plastic plate (31) extending toward the connecting plate (2). The flange (311) has a first clearance groove (3111) at a position corresponding to the first straight wall (111), and the first clearance groove (3111) extends along the length direction of the first straight wall (111).

5. The top cover assembly according to claim 2, characterized in that, Each pole post (1) includes two oppositely arranged connecting walls. The connecting walls of the two pole posts (1) away from each other are second straight walls (113) extending along the second direction. The groove (21) and the second side wall that match the second straight wall (113) are connected to the second straight wall (113) by welding.

6. The top cover assembly according to claim 5, characterized in that, The connecting assembly (3) includes a first plastic plate (31), the periphery of which extends toward the connecting plate (2) to form a flange (311). The flange (311) has a first clearance groove (3111) corresponding to the first straight wall (111) and a second clearance groove (3112) corresponding to the second straight wall (113). The first clearance groove (3111) extends along the length direction of the first straight wall (111), and the second clearance groove (3112) extends along the length direction of the second straight wall (113).

7. The top cover assembly according to claim 2, characterized in that, The connecting plate (2) is a square plate, the first direction is the length direction of the connecting plate (2), and the first straight wall (111) extends along the length direction of the connecting plate (2).

8. The top cover assembly according to claim 4, characterized in that, The connecting assembly (3) further includes a cover plate (33) and a second plastic plate (34) arranged in sequence. The cover plate (33) is located between the first plastic plate (31) and the second plastic plate (34). The first plastic plate (31), the cover plate (33), and the second plastic plate (34) are respectively provided with the opening (30). A sealing ring (4) is provided in the opening (30). The sealing ring (4) is at least sleeved on the periphery of the corresponding second column segment (12).

9. The top cover assembly according to claim 8, characterized in that, The length of the first column segment (11) is H1, and the depth of the groove (21) is H2. The length H1 and the depth H2 satisfy: H1 < H2.

10. The top cover assembly according to any one of claims 2 to 9, characterized in that, The connecting plate (2) has a first region (23) on a second wall surface (2b) opposite to the groove (21) for welding with a bar sheet, the first region (23) extending along the first direction.

11. The top cover assembly according to claim 10, characterized in that, The end face (114) of the first column segment (11) away from the second column segment (12) is connected to the corresponding position of the connecting plate (2) by welding.

12. The top cover assembly according to claim 11, characterized in that, The area where the connecting plate (2) is welded to the end face (114) of the first column segment (11) is defined as the second region (22). There are at least two first regions (23), and the second region (22) is located between the two first regions (23).

13. A vehicle comprising a battery, said battery including a top cover assembly and a battery plate, characterized in that, The top cover assembly is the top cover assembly according to any one of claims 1 to 12, wherein the plate is connected to the connecting plate (2) by welding and is electrically connected to the two pole posts (1).

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