Battery cover plate and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cover plate and a battery, the battery cover plate comprises a cover plate body provided with a pole hole, the hole wall of the pole hole is recessed to form a mounting groove, and the upper surface of the cover plate body is provided with an anti-rotation groove; the pole body penetrates through the pole hole, the periphery of the pole body protrudes to form a limiting convex rib, the limiting convex rib is suitable for penetrating through the mounting groove, the limiting convex rib is located above the upper surface, and the projection of the limiting convex rib and the projection of the mounting groove on the upper surface in the z direction are arranged in a staggered mode; and the upper insulating part is provided with a limiting groove, the limiting convex rib is located in the limiting groove, the outer wall of the upper insulating part protrudes to form an anti-rotation convex rib, and the anti-rotation convex rib is located in the anti-rotation groove. According to the utility model, the limiting convex ribs and the mounting grooves are arranged in a staggered manner, so that the limiting convex ribs and the cover plate body are limited in the z direction, and the stress of the pole body in the z direction is improved; and moreover, through the matching of the limiting convex ribs and the limiting grooves and the matching of the anti-rotation convex ribs and the anti-rotation grooves, the anti-torsion capability of the pole body is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery cover and a battery. Background Technology

[0002] With the development of new energy sources, the market demand for batteries is increasing, and battery safety performance has become a top priority. A battery typically consists of a casing and electrode arrays. The electrode arrays are housed within the casing, which includes a cover plate with terminals on it. The electrode arrays are electrically connected to the terminals. The terminals are usually inserted through the cover plate and secured with plastic to ensure insulation between the terminals and the cover plate. However, in existing technologies, the load-bearing capacity of the terminals is relatively weak, making them prone to rotation and loosening under stress, thus affecting battery safety performance. Utility Model Content

[0003] In view of this, the present invention provides a battery cover and a battery to solve the problem that the load-bearing capacity of the terminals in the prior art is weak, which can easily lead to the rotation and loosening of the terminals under stress, thus affecting the safety performance of the battery.

[0004] In a first aspect, this utility model provides a battery cover, comprising: a cover body having a terminal hole, the wall of the terminal hole being recessed to form a mounting groove, and an anti-rotation groove being formed on the upper surface of the cover body; a terminal body penetrating the terminal hole, the outer periphery of the terminal body protruding to form a limiting rib, the limiting rib being adapted to pass through the mounting groove, the limiting rib being located above the upper surface, and the limiting rib and the mounting groove being misaligned along the z-direction projection on the upper surface; and an upper insulating member surrounding the terminal body and at least partially disposed between the wall of the terminal hole and the outer wall of the terminal body, the upper insulating member forming a limiting groove, the limiting rib being located within the limiting groove, and an anti-rotation rib protruding from the outer wall of the upper insulating member, the anti-rotation rib being located within the anti-rotation groove.

[0005] In one optional embodiment, the pole hole includes a first hole and a second hole that are connected along the z-direction. The first hole is located above the second hole, and the diameter of the first hole is larger than the diameter of the second hole, so that the pole hole forms a stepped hole structure. The hole wall of the second hole is recessed to form the mounting groove, and the hole wall of the first hole is recessed to form the anti-rotation groove.

[0006] In one optional embodiment, the mounting groove is provided with a plurality of circumferentially spaced along the wall of the second hole, and the limiting rib is provided with a plurality of circumferentially spaced along the pole body; and / or, the anti-rotation groove is provided with a plurality of circumferentially spaced along the wall of the first hole, and the anti-rotation rib is provided with a plurality of circumferentially spaced along the upper insulating member.

[0007] In one alternative embodiment, the mounting groove and the anti-rotation groove are misaligned along the circumferential direction of the pole hole; or, the mounting groove and the anti-rotation groove are located in the same radial direction of the pole hole.

[0008] In one optional embodiment, the pole body includes a protruding section, a transition section, and a supporting section connected sequentially along the z-direction. The protruding section is located above the upper surface, the limiting rib is disposed on the outer periphery of the protruding section, the transition section is disposed corresponding to the hole wall of the pole hole, and the outer periphery of the supporting section extends beyond the outer periphery of the transition section to be disposed opposite to the lower surface of the cover plate body.

[0009] In one alternative implementation, the thickness of the support segment along the z-direction is t, which satisfies t≥1.0mm.

[0010] In one alternative embodiment, the battery cover further includes a lower insulating member that is fitted to the lower surface, with at least a portion of the lower insulating member located between the lower surface and the support section.

[0011] In one alternative embodiment, the battery cover further includes a seal that is compressed between the lower surface and the support section.

[0012] In one optional embodiment, the upper end face of the pole body has a busbar welding position, and along the z-direction, the thickness of the pole body corresponding to the busbar welding position is T, which satisfies T≥1.5mm.

[0013] Secondly, this utility model also provides a battery, including the aforementioned battery cover.

[0014] The technical solution of this application has the following advantages:

[0015] When inserting the terminal body into the terminal hole of the cover plate body, the limiting rib is aligned with the mounting groove so that the limiting rib passes through the mounting groove and is located above the upper surface of the cover plate body. Then, by rotating the terminal body, the limiting rib and the mounting groove are misaligned, thereby limiting the limiting rib and the cover plate body in the z-direction and improving the force resistance of the terminal body in the z-direction. Furthermore, the cooperation between the limiting rib and the limiting groove, as well as the cooperation between the anti-rotation rib and the anti-rotation groove, improves the torsional resistance of the terminal body. Thus, it prevents the terminal body from rotating or loosening under force, ensuring the safety performance of the battery. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific 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.

[0017] Figure 1 This is a schematic diagram of the overall structure of a battery cover according to an embodiment of the present utility model;

[0018] Figure 2 for Figure 1 A magnified view of part A in the diagram;

[0019] Figure 3 for Figure 1 A top view of the battery cover shown;

[0020] Figure 4 This is a schematic diagram of the structure of the cover plate body according to an embodiment of the present utility model;

[0021] Figure 5 for Figure 3 Partial sectional view along the CC direction;

[0022] Figure 6 for Figure 3 Partial sectional view along the DD direction;

[0023] Figure 7 for Figure 4 A magnified view of part B in the diagram;

[0024] Figure 8 This is a schematic diagram of the structure of the pole body and the limiting rib in an embodiment of the present utility model;

[0025] Figure 9 This is a schematic diagram of the upper insulating component and the anti-rotation rib in an embodiment of the present utility model;

[0026] Figure 10 This is a top view of the battery cover and connecting piece according to the first embodiment of the present utility model;

[0027] Figure 11 for Figure 10 A cross-sectional view along the EE direction;

[0028] Figure 12 This is a top view of the battery cover and connecting piece according to the second embodiment of the present utility model;

[0029] Figure 13 for Figure 12 A cross-sectional view along the FF direction;

[0030] Figure 14 This is a top view of the battery cover and connecting piece according to the third embodiment of this utility model.

[0031] Figure 15 for Figure 14 A cross-sectional view along the GG direction.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Cover plate body; 11. Pole post hole; 111. First hole body; 112. Second hole body; 12. Mounting groove; 13. Anti-rotation groove; 14. Upper surface; 15. Lower surface; 2. Pole post body; 21. Protruding section; 22. Transition section; 23. Supporting section; 24. Insertion hole; 3. Limiting rib; 4. Upper insulating component; 41. Limiting groove; 5. Anti-rotation rib; 6. Lower insulating component; 7. Sealing component; 8. Connecting piece; 81. Protrusion. Detailed Implementation

[0034] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0035] The following combination Figures 1 to 15 , describing the embodiments of the present utility model.

[0036] According to an embodiment of the present invention, a battery cover is provided, comprising: a cover body 1, a terminal post body 2, and an upper insulating member 4. The cover body 1 has a terminal post hole 11, the hole wall of which is recessed to form a mounting groove 12. An anti-rotation groove 13 is formed on the upper surface 14 of the cover body 1. The terminal post body 2 extends through the terminal post hole 11, and a limiting rib 3 protrudes from its outer periphery. The limiting rib 3 is adapted to pass through the mounting groove 12 and is located above the upper surface 14. The limiting rib 3 and the mounting groove 12 are misaligned along the z-direction on the upper surface 14. The upper insulating member 4 surrounds the terminal post body 2 and is at least partially disposed between the hole wall of the terminal post hole 11 and the outer wall of the terminal post body 2. The upper insulating member 4 forms a limiting groove 41, the limiting rib 3 is located within the limiting groove 41, and an anti-rotation rib 5 protrudes from the outer wall of the upper insulating member 4, located within the anti-rotation groove 13.

[0037] In this embodiment, when the terminal body 2 is inserted into the terminal hole 11 of the cover body 1, the limiting rib 3 is positioned correspondingly to the mounting groove 12, so that the limiting rib 3 passes through the mounting groove 12 and is located above the upper surface 14 of the cover body 1. Then, by rotating the terminal body 2, the limiting rib 3 and the mounting groove 12 are misaligned, thereby limiting the limiting rib 3 and the cover body 1 in the z-direction and improving the force on the terminal body 2 in the z-direction. Furthermore, the cooperation between the limiting rib 3 and the limiting groove 41 and the cooperation between the anti-rotation rib 5 and the anti-rotation groove 13 improves the torsional resistance of the terminal body 2. Thus, the terminal body 2 is prevented from rotating or loosening under force, ensuring the safety performance of the battery.

[0038] It is worth noting that when the pole body 2 is inserted into the pole hole 11 of the cover plate body 1, the limiting rib 3 and the mounting groove 12 are on the same straight line along the z-direction, thus allowing the limiting rib 3 to pass through the mounting groove 12. After the pole body 2 is inserted into place, the pole body 2 is rotated a certain angle around its own axis. At this time, the limiting rib 3 and the mounting groove 12 are not on the same straight line along the z-direction (i.e., misaligned). Therefore, when the pole body 2 is subjected to a force in the z-direction, the limiting rib 3 can interfere with the cover plate body 1, hindering the z-direction movement of the pole body 2.

[0039] It should be noted that in this embodiment, after the pole body 2 is assembled, the upper insulating part 4 is formed by injection molding, so that the upper insulating part 4 forms a limiting groove 41 for cooperating with the limiting rib 3, and the outer wall of the upper insulating part 4 protrudes to form an anti-rotation rib 5 for cooperating with the anti-rotation groove 13.

[0040] It should be further explained that after injection molding, the outer wall of the upper insulating part 4 is also formed with a raised rib that fits into the mounting groove 12, which can also play a role in preventing rotation.

[0041] In one embodiment, Figure 7 As shown, the pole post hole 11 includes a first hole body 111 and a second hole body 112 connected along the z-direction. The first hole body 111 is located above the second hole body 112. The diameter of the first hole body 111 is larger than the diameter of the second hole body 112, so that the pole post hole 11 forms a stepped hole structure. The hole wall of the second hole body 112 is recessed to form an installation groove 12, and the hole wall of the first hole body 111 is recessed to form an anti-rotation groove 13.

[0042] It is worth noting that the diameter corresponding to the outer contour of the limiting rib 3 is greater than the diameter of the second hole 112.

[0043] Of course, in other alternative embodiments, the pole hole 11 can also be a cylindrical hole with a constant diameter. In this case, the mounting groove 12 penetrates the cover plate body 1 along the z direction, and the anti-rotation groove 13 is opened downward from the upper surface 14 of the cover plate body 1 but does not penetrate the cover plate body 1 along the z direction.

[0044] Furthermore, in one embodiment, such as Figures 1 to 9 As shown, several mounting grooves 12 are spaced apart circumferentially along the wall of the second hole 112, and several limiting ribs 3 are spaced apart circumferentially along the pole body 2; several anti-rotation grooves 13 are spaced apart circumferentially along the wall of the first hole 111, and several anti-rotation ribs 5 are spaced apart circumferentially along the upper insulating member 4. This arrangement further improves the load-bearing capacity of the pole body 2.

[0045] Specifically, the number of mounting grooves 12 and the number of limiting ribs 3 are the same and correspond one-to-one, so that several limiting ribs 3 can pass through several mounting grooves 12 respectively. The anti-rotation ribs 5 are injection molded simultaneously during the injection molding process of the upper insulating part 4. Therefore, the injection molding material fills several anti-rotation grooves 13, and the number of anti-rotation ribs 5 is the same as the number of anti-rotation grooves 13. The number of mounting grooves 12 and the number of anti-rotation grooves 13 can be the same or different; and, along the circumference of the pole hole 11, the mounting grooves 12 and the anti-rotation grooves 13 can be staggered (that is, the mounting grooves 12 and the anti-rotation grooves 13 are not in the same radial direction of the pole hole 11), or the mounting grooves 12 and the anti-rotation grooves 13 can be located in the same radial direction of the pole hole 11.

[0046] In one embodiment, Figure 8 As shown, the pole body 2 includes a protruding section 21, a transition section 22, and a supporting section 23 connected sequentially along the z-direction. The protruding section 21 is located above the upper surface 14, and a limiting rib 3 is disposed on the outer periphery of the protruding section 21. The transition section 22 is disposed corresponding to the hole wall of the pole hole 11. The outer periphery of the supporting section 23 extends beyond the outer periphery of the transition section 22, so as to be disposed opposite to the lower surface 15 of the cover plate body 1. With this arrangement, the limiting rib 3 and the supporting section 23 limit the pole body 2 on both the upper and lower surfaces of the cover plate body 1, thereby improving the load-bearing capacity of the pole body 2 in the z-direction. Furthermore, the pole body 2 is installed and fixed on the cover plate body 1 by injection molding the upper insulating part 4, which is simple to assemble and easy to process.

[0047] Furthermore, in one embodiment, such as Figure 5 As shown, the thickness of the support section 23 along the z-direction is t, which satisfies t≥1.0mm. If the value of t is too small, that is, the support section 23 is too thin, the structural strength of the support section 23 is weak and cannot meet the stress requirements of the pole body 2 in the z-direction.

[0048] It should be noted that, in this embodiment, under the combined action of the limiting rib 3 and the supporting section 23, the force on the pole body 2 in the z direction can exceed 1200N.

[0049] In one embodiment, Figure 5 As shown, the battery cover also includes a lower insulating member 6, which is fitted to the lower surface 15, with at least a portion of the lower insulating member 6 located between the lower surface 15 and the supporting section 23. By providing the lower insulating member 6, insulation is achieved between the cover body 1 and the terminal post body 2, as well as between the cover body 1 and the electrode assembly.

[0050] Furthermore, in one embodiment, such as Figure 5 As shown, the battery cover also includes a seal 7, which is compressed and disposed between the lower surface 15 and the support section 23. With this arrangement, the compression of the seal 7 is not affected by the thickness of the cover body 1, but only by the thickness of the lower insulating member 6 located between the cover body 1 and the support section 23 during the manufacturing process, reducing influencing factors and improving sealing reliability.

[0051] It is worth noting that in related technologies, in order to detect battery short circuits and prevent casing corrosion, the upper insulating component 4 corresponding to the positive electrode post 2 contains carbon fiber. The positive electrode post 2 and the cover plate 1 achieve weak conductivity by simultaneously contacting the upper insulating component 4 (conductive). In this embodiment, when the sealing component 7 expands due to heat, it can apply a force to the supporting section 23 and the lower surface 15 of the cover plate 1, making the contact between the post 2 and the cover plate 1 and the upper insulating component 4 more reliable.

[0052] It should be noted that part of the upper insulating element 4 extends between the lower surface 15 of the cover plate body 1 and the supporting section 23.

[0053] When the battery pack is formed, the terminal bodies 2 of adjacent batteries are electrically connected by welding to the busbar. Therefore, in one embodiment, as... Figure 5 As shown, the upper end face of the electrode body 2 has a busbar welding position. Along the z-direction, the thickness of the electrode body 2 at the busbar welding position is T, which satisfies T≥1.5mm. This setting satisfies the penetration depth requirement for welding the electrode body 2 to the busbar. That is, if the value of T is too small, the electrode body 2 may not be able to accommodate the penetration depth of the weld in the thickness direction, resulting in the electrode body 2 being welded through.

[0054] It is worth noting that the assembly sequence of the battery cover in this embodiment is as follows: cover body 1 - lower insulating component 6 - sealing component 7 - terminal body 2 - upper insulating component 4 (injection molding). The upper insulating component 4 is injection molded after the sealing component 7 and the terminal body 2 are assembled, so that the upper insulating component 4 can have good contact with both the terminal body 2 and the cover body 1.

[0055] In this embodiment, as Figures 1 to 4 As shown, the cover plate body 1 has two pole hole 11 and two pole bodies 2 are provided. The polarities of the two pole bodies 2 are opposite (positive and negative respectively). The two pole bodies 2 are respectively provided with the two pole hole 11.

[0056] According to an embodiment of the present invention, another aspect provides a battery including the aforementioned battery cover.

[0057] In one embodiment, the battery further includes an electrode assembly, which includes tabs that are electrically connected to the terminal body 2. Specifically, the tabs can be directly welded to the terminal body 2; alternatively, the tabs can be connected to the terminal body 2 via a connecting piece 8, that is, the tabs are welded to the connecting piece 8, and then the connecting piece 8 is welded to the terminal body 2.

[0058] Furthermore, when welding the electrode tab to the electrode post body 2 via the connecting piece 8, there are three implementation methods. In the first implementation method, as follows... Figure 10 and Figure 11 As shown, the lower end of the pole body 2 has an insertion hole 24, and a protrusion 81 is formed on the connecting piece 8. The protrusion 81 is inserted into the insertion hole 24 and welded to the wall of the insertion hole 24. In the second embodiment, as... Figure 12 and Figure 13 As shown, the connecting piece 8 is directly welded to the lower end face of the pole body 2. In this case, the pole body 2 may have a socket 24 (for weight reduction and material reduction), or it may not have a socket 24. In the third embodiment, as... Figure 14 and Figure 15 As shown, the connecting piece 8 is welded to the outer peripheral surface of the supporting section 23. At this time, the pole body 2 can have a socket 24 (for weight reduction and material reduction) or it can be without a socket 24.

[0059] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery cover, characterized in that, include: The cover plate body (1) has an electrode post hole (11), the hole wall of the electrode post hole (11) is recessed to form an installation groove (12), and the upper surface (14) of the cover plate body (1) has an anti-rotation groove (13). The pole body (2) is provided through the pole hole (11). The outer periphery of the pole body (2) protrudes to form a limiting rib (3). The limiting rib (3) is adapted to pass through the mounting groove (12). The limiting rib (3) is located above the upper surface (14). The limiting rib (3) and the mounting groove (12) are misaligned along the z-direction on the upper surface (14). An upper insulating member (4) is disposed around the pole body (2) and at least partially disposed between the hole wall of the pole hole (11) and the outer wall of the pole body (2). The upper insulating member (4) forms a limiting groove (41). The limiting rib (3) is located in the limiting groove (41). The outer wall of the upper insulating member (4) protrudes to form an anti-rotation rib (5). The anti-rotation rib (5) is located in the anti-rotation groove (13).

2. The battery cover according to claim 1, characterized in that, The pole post hole (11) includes a first hole body (111) and a second hole body (112) connected along the z-direction. The first hole body (111) is located above the second hole body (112). The diameter of the first hole body (111) is larger than the diameter of the second hole body (112) so that the pole post hole (11) forms a stepped hole structure. The hole wall of the second hole body (112) is recessed to form the mounting groove (12), and the hole wall of the first hole body (111) is recessed to form the anti-rotation groove (13).

3. The battery cover according to claim 2, characterized in that, The mounting groove (12) is provided with a plurality of circumferentially spaced along the wall of the second hole (112), and the limiting rib (3) is provided with a plurality of circumferentially spaced along the pole body (2); and / or, The anti-rotation groove (13) is provided in a plurality of spaces along the circumferential direction of the hole wall of the first hole (111), and the anti-rotation rib (5) is provided in a plurality of spaces along the circumferential direction of the upper insulating member (4).

4. The battery cover according to claim 3, characterized in that, Along the circumferential direction of the pole hole (11), the mounting groove (12) and the anti-rotation groove (13) are misaligned; or, The mounting groove (12) and the anti-rotation groove (13) are located in the same radial direction of the pole hole (11).

5. The battery cover according to any one of claims 1 to 4, characterized in that, The pole body (2) includes a protruding section (21), a transition section (22) and a supporting section (23) connected sequentially along the z-direction. The protruding section (21) is located above the upper surface (14). The limiting rib (3) is disposed on the outer periphery of the protruding section (21). The transition section (22) is disposed corresponding to the hole wall of the pole hole (11). The outer periphery of the supporting section (23) extends out of the outer periphery of the transition section (22) and is disposed opposite to the lower surface (15) of the cover plate body (1).

6. The battery cover according to claim 5, characterized in that, Along the z-direction, the thickness of the supporting section (23) is t, which satisfies t≥1.0mm.

7. The battery cover according to claim 5, characterized in that, The battery cover also includes a lower insulating member (6), which is fitted to the lower surface (15), and at least part of the lower insulating member (6) is located between the lower surface (15) and the supporting section (23).

8. The battery cover according to claim 7, characterized in that, The battery cover also includes a seal (7), which is compressed between the lower surface (15) and the support section (23).

9. The battery cover according to any one of claims 1 to 4, characterized in that, The upper end face of the pole body (2) has a busbar welding position. Along the z direction, the thickness of the pole body (2) at the busbar welding position is T, which satisfies T≥1.5mm.

10. A battery, characterized in that, The battery cover includes any one of claims 1 to 9.

Images