Top cover structure for battery, battery and vehicle

Abstract

The utility model relates to the technical field of batteries, particularly provides a top cover structure for a battery, the battery and a vehicle, and aims to solve the problem that an existing top cover structure cannot provide stable support for a pole column. In order to achieve the purpose, the top cover structure comprises a lower bottom plate, the upper cover plate is connected with the lower bottom plate; a pole hole is formed in the upper cover plate; comprising a base body part and a post body part, and the post body part is arranged in the post hole in a penetrating manner; the sealing ring is arranged at the tail end of the column body part in a sleeving manner and is arranged between the base body part and the upper cover plate; the sealing ring comprises a body part and a protruding part, the bottom of the body part is attached to the base body part, and the top of the protruding part is attached to the upper cover plate. And the crimping part is sleeved on the cylinder part, is connected with the cylinder part and the side wall of the pole hole in a sealing manner, and is connected with the body part of the sealing ring. According to the top cover structure, the height of the crimping part is increased by optimizing the structure of the sealing ring, so that the crimping part provides stable support and protection for the post terminal.

Description

Technical Field

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

[0002] New energy vehicles are being widely promoted both domestically and globally, but many improvements are still needed before they can completely replace gasoline-powered vehicles. For example, the short driving range, high battery pack cost, and reliability of battery packs remain issues that require further resolution. Based on these problems, higher requirements are being placed on the core component of new energy vehicles: the power battery. For instance, the power battery needs to achieve higher energy density and lower cost.

[0003] Currently, the power batteries of new energy vehicles generally adopt a square hard-shell structure. The power battery casing includes the housing and the top cover assembly. The power battery housing provides a sealed space to house the electrode assembly and electrolyte. The electrical energy of the electrode assembly is led out of the sealed space through the terminals of the top cover assembly.

[0004] In existing top cover assemblies, the top cover plate is a metal plate with through holes. To prevent short circuits between the positive and negative terminals, insulating material is typically used to insulate the negative terminal from the top cover plate. To achieve good sealing performance, a sealing element is usually added between the terminal and the top cover plate. During assembly, the terminal consists of a base and an extension, with the cross-sectional area of ​​the base larger than the diameter of the through hole in the top cover plate. The base is located below the top cover plate (i.e., inside the housing), and the extension is fixed to the top cover plate using a welded, separate annular component after passing through the through hole. This method requires welding and involves numerous parts, resulting in high costs and hindering large-scale production.

[0005] Although some improvements have been made to the existing top cover assembly, eliminating the welded ring-shaped component, the thickness of the seal between the pole and the top cover is still limited by the overall height of the top cover assembly. When the pole is subjected to enormous pressure, insufficient seal thickness will fail to provide stable support and protection for the pole. Utility Model Content

[0006] The present invention aims to solve the above-mentioned technical problems, namely, to solve the problem that the thickness of the sealing element in the existing top cover assembly is insufficient, which makes it unable to provide stable support and protection for the pole post.

[0007] In a first aspect, the present invention provides a top cover structure for a battery, comprising: a lower base plate; an upper cover plate connected to the lower base plate, the upper cover plate having an electrode post hole; an electrode post comprising a base portion and a column portion disposed on the base portion, the column portion passing through the electrode post hole; a sealing ring sleeved on the end of the column portion, disposed between the base portion and the upper cover plate; the sealing ring comprising a body portion and a protrusion portion protruding from the periphery of the body portion toward the upper cover plate, the bottom of the body portion fitting against the base portion, the top of the protrusion portion fitting against the upper cover plate; and a pressing member sleeved on the column portion, sealingly connected to the column portion and the side wall of the electrode post hole, and connected to the body portion of the sealing ring.

[0008] Furthermore, the pole post has an annular rib on its side wall.

[0009] Furthermore, the pressing member includes a top plate and a pressing part; the top plate covers the pole hole; the pressing part is disposed on one side of the top plate facing the body portion of the sealing ring and extends towards the body portion, for pressing the body portion of the sealing ring onto the base portion of the pole; a through hole is provided at the center of the pressing part and the top plate, for allowing the pole portion of the pole to pass through the pressing part and the top plate.

[0010] Furthermore, a corresponding first groove is provided on the side wall opposite to the protruding rib of the column portion, for sealing connection between the crimping portion and the protruding rib portion.

[0011] Furthermore, multiple anti-rotation portions are provided at intervals on the convex rib portion to limit the rotation of the pole post.

[0012] Furthermore, a flange is provided around the periphery of the pole hole; a second groove corresponding to the flange is provided on the surface of the top plate opposite to the upper cover plate, for sealing connection between the top surface of the top plate and the top cover plate.

[0013] Furthermore, a through hole is provided on the lower base plate, and the base portion of the pole post is disposed in the through hole.

[0014] Furthermore, it also includes: an explosion-proof valve disposed on the upper cover plate; and an explosion-proof valve patch covering the explosion-proof valve.

[0015] In a second aspect, the present invention also provides a battery, comprising: a housing having an open end; a battery cell disposed within the housing; and a top cover structure for the battery as described in any of the preceding claims, which covers the open end of the housing.

[0016] In a third aspect, the present invention provides a vehicle comprising the battery as described above.

[0017] With the above technical solution adopted, compared with the height of the upper sealing member corresponding to the convex sealing ring in the existing top cover structure, the height of the pressing part in the pressing member that connects with the body of the sealing ring is increased by setting the sealing ring as a recessed platform structure composed of a body part and a protrusion part. This makes the height of the pressing part in the pressing member able to provide stable support and protection for the pole when the pole is subjected to great pressure. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application 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 only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] In the attached image:

[0020] Figure 1 This is a structural diagram of the existing top cover assembly;

[0021] Figure 2 This is a schematic diagram of the overall structure of the top cover structure for the battery in an embodiment of this application;

[0022] Figure 3 This is an exploded view of the top cover structure for the battery in an embodiment of this application;

[0023] Figure 4 This is a top view of the top cover structure for the battery in an embodiment of this application;

[0024] Figure 5 for Figure 4 Cross-sectional view of AA;

[0025] Figure 6 This is a schematic diagram of the pole structure in the embodiments of this application;

[0026] Figure 7A This is a schematic diagram of the sealing ring structure in an embodiment of this application;

[0027] Figure 7B for Figure 7A Cross-sectional view of the central sealing ring;

[0028] Figure 8A and Figure 8B This is a schematic diagram of the structure of the crimping member in the embodiments of this application;

[0029] Figure 8C for Figure 8A Cross-sectional view of the medium-pressure connector;

[0030] Figure 9 for Figure 5 Enlarged view of the medium-pressure connector mating with the pole, upper cover plate, and sealing ring.

[0031] Figure label:

[0032] 10. Bottom plate; 11. Through hole; 20. Top cover plate; 21. Pole post hole; 211. Flanged part; 30. Pole post; 31. Base part; 32. Column part; 321. Raised rib part; 322. Anti-rotation part; 40. Sealing ring; 41. Body part; 42. Protrusion part; 50. Press-fit part; 51. Top plate; 52. Press-fit part; 53. First groove; 54. Second groove; 60. Explosion-proof valve; 70. Explosion-proof valve patch. Detailed Implementation

[0033] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0034] First, it should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "vertical," "horizontal," "longitudinal," "inner," and "outer," which indicate directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] Figure 1 The diagram shows the existing top cover assembly structure, in which the bottom of the upper seal, located between the pole and the top cover, abuts against the top of a sealing ring fitted onto the end of the pole. This sealing ring is U-shaped, and the bottom of the upper seal abuts against the protruding top of this U-shaped sealing ring. This U-shaped sealing ring restricts the space for the upper sealing component to increase in height downwards.

[0037] like Figures 2 to 5 As shown in the figure, this application provides a top cover structure for a battery, including: a lower base plate 10, an upper cover plate 20, terminals 30, a sealing ring 40, and a pressing member 50. Specifically, the upper cover plate 20 is fixedly connected to the lower base plate 10, for example, by snap-fit ​​and / or fasteners. The upper cover plate 20 has a terminal hole 21, and the lower base plate 10 has a through hole 11. The upper cover plate 20 is typically made of metal.

[0038] like Figure 6 As shown, the terminal post 30 includes a base portion 31 and a cylindrical portion 32 disposed on the base portion 31. The base portion 31 is typically disc-shaped, and the cylindrical portion 32 is typically cylindrical; the base portion 31 and the cylindrical portion 32 are typically integrally formed. The top cover structure for the battery typically includes two terminal posts 30, one positive terminal post and the other negative terminal post. These two terminal posts 30 have identical structures and are connected to the positive and negative electrodes inside the battery, respectively. Correspondingly, two terminal post holes 21 are formed in the upper cover plate 20, and two through holes 11 are formed in the lower base plate 10, with one terminal post hole 21 and one through hole 11 coaxially corresponding.

[0039] like Figure 3 , Figure 5 , Figure 6 and Figure 9 As shown, the column portion 32 passes through the pole post hole 21, and the base portion 31 is disposed on the lower base plate 10. The through hole 11 in the lower base plate 10 corresponds to the shape and size of the base portion 31 of the pole post 30, so that the column portion 32 of the pole post 30 can pass through the through hole 11 from the bottom of the lower base plate 10 into the pole post hole 21 in the upper cover plate 20. Furthermore, by placing the base portion 31 of the pole post 30 in the through hole 11 in the lower base plate 10, the pole post 30 is fixed in place. The area of ​​the base portion 31 of the pole post 30 is larger than the area of ​​the pole post hole 21, thereby preventing the base portion 31 of the pole post 30 from detaching from the pole post hole 21 in the upper cover plate 20.

[0040] like Figure 5 , Figure 7A , Figure 7B and Figure 9 As shown, the sealing ring 40 is fitted onto the end of the cylindrical portion 32 of the pole post 30, and is disposed between the base portion 31 of the pole post 30 and the upper cover plate 20. The sealing ring 40 includes a body portion 41 and a protrusion portion 42 that protrudes from the periphery of the body portion 41 toward the upper cover plate 20, such that the body portion 41 and the protrusion portion 42 of the sealing ring 40 form a recessed platform structure. The bottom of the body portion 41 of the sealing ring 40 is in contact with the base portion 31 of the pole post 30, and the top of the protrusion portion 42 of the sealing ring 40 is in contact with the upper cover plate 20.

[0041] like Figure 5, Figures 8A to 8C as well as Figure 9 As shown, the crimping member 50 is sleeved on the cylindrical portion 32 of the pole post 30, sealingly connected to the cylindrical portion 32 and the side wall of the pole post hole 21, and crimped against the body portion 41 of the sealing ring 40. The crimping member 50 includes a top plate 51 and a crimping portion 52. The top plate 51 covers the pole post hole 21; the crimping portion 52 is disposed on the side of the top plate 51 facing the body portion 41 of the sealing ring 40 and extends towards the body portion 41, for pressing the body portion 41 of the sealing ring 40 onto the base portion 31 of the pole post 30. A through hole is provided at the center of the top plate 51 and the crimping portion 52, for allowing the cylindrical portion 32 of the pole post 30 to pass through the crimping portion 52 and the top plate 51.

[0042] like Figure 6 As shown, an annular rib 321 is provided on the side wall of the column portion 32 of the pole post 30. (As shown...) Figure 8B and Figure 8C As shown, the crimping portion 52 of the crimping member 50 has a corresponding first groove 53 on the side wall that mates with the protruding rib 321 provided on the side wall of the column portion 32 of the pole post 30. For example... Figure 9 As shown, the crimping portion 52 of the crimping member 50 is sealed and connected to the column portion 32 of the pole post 30.

[0043] like Figure 3 and Figure 9 As shown, the periphery of the pole hole 21 on the upper cover plate 20 is provided with a flange 211. Figure 8B and Figure 8C As shown, the top plate 51 of the crimping member 50 has a second groove 54 corresponding to the flange 211 on the surface opposite to the upper cover plate 20. The second groove 54 on the top plate 51 cooperates with the flange 211 around the pole hole 21, so that the top plate 51 of the crimping member 50 is sealed and connected to the top surface of the upper cover plate 20.

[0044] like Figure 6 As shown, multiple anti-rotation portions 322 are provided at intervals in the rib portion 321, so that the continuous, annular rib portion 321 is divided into several segments of rib portion 321 by the multiple anti-rotation portions 322, which serves to restrict the pole post 30 from rotating around its central axis.

[0045] The press-fit part 50 can be formed by injection molding. After the sealing ring 40 is fitted onto the pole post 30 and the pole post 30 is inserted into the pole post hole 21 on the upper cover plate 20, injection molding material is injected into the space enclosed by the pole post 30, the sealing ring 40 and the side wall of the pole post hole 21, and the injection molding material covers the flange portion 211 of the pole post hole 21, thereby forming the press-fit part 50.

[0046] like Figure 3As shown, an explosion-proof valve 60 is also provided on the upper cover plate 20 to provide explosion protection. The upper cover plate 20 has corresponding openings for installing the explosion-proof valve 60, and an explosion-proof valve patch 70 covers the explosion-proof valve 60 to protect it.

[0047] Compared to the height of the upper sealing element corresponding to the convex sealing ring in the existing top cover structure, the top cover structure in this embodiment increases the height of the pressing portion 52 in the pressing member 50 that connects to the body portion 41 of the sealing ring 40 by setting the sealing ring 40 as a recessed structure composed of a body portion 41 and a protrusion portion 42. This ensures that when the pole post 30 is subjected to enormous pressure, the height of the pressing portion 52 in the pressing member 50 can provide stable support and protection for the pole post 30.

[0048] This application provides another battery (not shown in the figures), which includes a housing, a battery cell, and a top cover structure for the battery as described in any of the above embodiments. The housing has an open end, the battery cell is disposed inside the housing, and the top cover structure for the battery covers the open end of the housing.

[0049] This application also provides a vehicle (not shown in the figures) that includes the battery described above.

[0050] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A top cover structure for a battery, characterized in that, include: Bottom plate (10); The upper cover plate (20) is connected to the lower bottom plate (10), and the upper cover plate (20) is provided with pole hole (21); The pole post (30) includes a base portion (31) and a column portion (32) disposed on the base portion (31), the column portion (32) being inserted into the pole post hole (21); A sealing ring (40) is fitted onto the end of the column portion (32) and disposed between the base portion (31) and the upper cover plate (20); The sealing ring (40) includes a body part (41) and a protrusion (42) that protrudes from the periphery of the body part (41) toward the upper cover plate (20). The bottom of the body part (41) is in contact with the base part (31), and the top of the protrusion (42) is in contact with the upper cover plate (20). A crimping member (50) is fitted onto the cylindrical part (32), and is sealed to the side wall of the cylindrical part (32) and the pole hole (21), and is connected to the body part (41) of the sealing ring (40).

2. The top cover structure according to claim 1, characterized in that, The pole post (30) has an annular rib (321) on the side wall of the column part (32).

3. The top cover structure according to claim 2, characterized in that, The crimping member (50) includes a top plate (51) and a crimping part (52); The top plate (51) covers the pole hole (21); The crimping part (52) is disposed on one side of the top plate (51) facing the body part (41) of the sealing ring (40) and extends toward the body part (41) for pressing the body part (41) of the sealing ring (40) onto the base part (31) of the pole post (30). The center of the crimping part (52) and the top plate (51) is provided with a through hole for the column part (32) of the pole post (30) to pass through the crimping part (52) and the top plate (51).

4. The top cover structure according to claim 3, characterized in that, The crimping part (52) has a corresponding first groove (53) on the side wall opposite to the rib (321) of the column part (32), which is used to seal the crimping part (52) and the rib (321) together.

5. The top cover structure according to claim 4, characterized in that, Multiple anti-rotation portions (322) are provided at intervals on the convex rib portion (321) to limit the rotation of the pole post (30).

6. The top cover structure according to claim 3, characterized in that, The periphery of the pole post hole (21) is provided with a flange (211); The top plate (51) is provided with a second groove (54) corresponding to the flange (211) on the surface opposite to the upper cover plate (20), which is used to seal the top surface of the top plate (51) and the upper cover plate (20).

7. The top cover structure according to claim 1, characterized in that, The bottom plate (10) has a through hole (11), and the base part (31) of the pole post (30) is disposed in the through hole (11).

8. The top cover structure according to any one of claims 1 to 7, characterized in that, Also includes: An explosion-proof valve (60) is disposed on the upper cover plate (20); An explosion-proof valve patch (70) covers the explosion-proof valve (60).

9. A battery, characterized in that, include: The housing has an open end; The battery cell is disposed within the housing; The top cover structure for a battery as described in any one of claims 1 to 8, which covers the opening end of the housing.

10. A vehicle, characterized in that, Includes the battery as described in claim 9.

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