Pole structure, cover plate assembly and battery

Abstract

The utility model belongs to the technical field of battery structures, and discloses a pole structure, a cover plate assembly and a battery. The pole structure comprises a pole riveting block and a pole body, the pole body comprises a riveting part, a connecting part and an abutting part, the riveting part is connected to one end of the connecting part, the abutting part is connected to the other end of the connecting part, and the riveting part can sequentially penetrate through a pole hole and a riveting hole of a battery cover plate and is riveted with the pole riveting block. And the battery cover plate is clamped and fixed between the pole riveting block and the abutting part. Before riveting, the deformation avoiding space can be formed between one part of the connecting part and the inner circumferential surface of the pole hole, and the deformation avoiding space is used for accommodating deformation of the connecting part in the riveting process, so that the pressure of the pole body on the inner wall of the pole hole in the radial direction after riveting can be reduced, and the deformation degree of the pole hole is reduced; the flatness of the battery cover plate and the end face of the pole body is guaranteed, and the pole body and the pole riveting block can be tightly sealed.

Description

Technical Field

[0001] The utility model relates to the technical field of battery structures, in particular to a pole column structure, a cover plate assembly and a battery. Background Art

[0002] During the assembly of the battery cover plate assembly, it is necessary to rivet the pole column body and the pole column block together. However, in the prior art, after riveting, the entire pole column body has large deformations in both the axial and radial directions. Especially the radial deformation will cause the pole column hole on the battery cover plate to deform, especially expand in its width direction (such as the Y-axis direction shown in Figure 1 ), which will not only affect the sealing performance at the pole column hole, but also make it difficult to weld the battery cover plate to the battery housing.

[0003] Based on the above, there is an urgent need for a pole column structure, a cover plate assembly and a battery to solve the above technical problems. Summary of the Utility Model

[0004] An object of the utility model is to provide a pole column assembly and a cover plate assembly, which can avoid the deformation of the pole column hole when the pole column assembly is riveted and installed on the battery cover plate.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A pole column structure capable of being riveted and installed on a battery cover plate. The pole column structure includes a pole column riveting block and a pole column body. The pole column riveting block has a riveting hole. The pole column body includes a riveting part, a connecting part and an abutting part. The riveting part is connected to one end of the connecting part, and the abutting part is connected to the other end of the connecting part. The riveting part can sequentially pass through the pole column hole of the battery cover plate and the riveting hole and be riveted to the pole column riveting block to sandwich and fix the battery cover plate between the pole column riveting block and the abutting part;

[0007] Moreover, before riveting, a deformation avoidance space can be formed between a part of the outer peripheral surface of the connecting part and the inner peripheral surface of the pole column hole. The deformation avoidance space is used to accommodate the deformation generated by the connecting part during the riveting process.

[0008] Preferably, another part of the outer peripheral surface of the connecting part can abut against the inner peripheral surface of the pole column hole so that the pole column body is limited and inserted into the pole column hole.

[0009] Preferably, the axial direction of the pole post hole is parallel to the thickness direction of the battery cover plate, and the longitudinal cross-sectional shape of the pole post hole is cylindrical. The connecting portion includes at least one large-diameter portion and at least one small-diameter portion, and the large-diameter portion and the small-diameter portion are arranged along the axial direction of the connecting portion. The large-diameter portion can abut against the inner peripheral surface of the pole post hole, and a deformation avoidance space can be formed between the small-diameter portion and the inner peripheral surface of the pole post hole.

[0010] Preferably, a transition portion is further connected between the large-diameter portion and the small-diameter portion, so that the large-diameter portion, the transition portion and the small-diameter portion have uniformly varying diameters.

[0011] Preferably, the large-diameter portion is located at one end of the connecting portion close to the abutting portion, the small-diameter portion is located at one end of the connecting portion close to the riveting portion, and the transition portion is connected between the large-diameter portion and the small-diameter portion.

[0012] Preferably, the connecting portion has a draft angle, and the draft angle is 0-10 degrees.

[0013] Preferably, before riveting, the end face of the connecting portion for abutting against the pole post riveting block is higher than the top surface of the battery cover plate.

[0014] Preferably, the height difference between the end face of the connecting portion for abutting against the pole post riveting block and the top surface of the battery cover plate is 0-0.5 mm.

[0015] A cover plate assembly includes a battery cover plate, an upper plastic, a sealing ring, a lower plastic and the above-mentioned pole post structure. The pole post body of the pole post structure can sequentially pass through the lower plastic, the sealing ring, the battery cover plate, the upper plastic and the pole post riveting block of the pole post structure, and is riveted and connected to the pole post riveting block to fixedly connect the lower plastic, the sealing ring, the battery cover plate, the upper plastic and the pole post structure.

[0016] The beneficial effects of the pole post structure and the cover plate assembly provided by the present invention: By forming a deformation avoidance space between the connecting portion and the pole post hole, the deformation generated by the connecting portion during the riveting process can be accommodated, the pressure of the pole post body on the inner wall of the pole post hole along its radial direction after riveting can be reduced, thereby reducing the degree of deformation of the pole post hole, ensuring the flatness of the battery cover plate and the end face of the pole post body, being beneficial to the battery cover plate and the sealing ring to achieve good sealing performance, also being beneficial to the assembly and welding between the battery cover plate and the battery housing, and enabling the pole post body and the pole post riveting block to be closely attached, reducing the resistance between the pole post body and the pole post riveting block.

[0017] Another object of the present utility model is to provide a battery with excellent sealing performance to ensure a high production yield rate.

[0018] To achieve this object, the present utility model adopts the following technical solutions:

[0019] The battery includes a battery housing and the above-mentioned cover plate assembly. One end of the battery housing is provided with an opening, and the cover plate assembly is sealingly connected to the opening.

[0020] The beneficial effects of the battery provided by the present utility model are as follows: The cover plate assembly has excellent sealing performance and low deformation degree, which is conducive to the sealing connection with the battery housing, thereby further improving the sealing performance and reliability of the entire battery and enhancing the production yield rate. Description of the Drawings

[0021] Figure 1 is the top view of the battery cover plate provided by the present utility model;

[0022] Figure 2 is the top view of the cover plate assembly provided by the present utility model;

[0023] Figure 3 is along Figure 2 the cross-sectional view in the A-A direction in

[0024] Figure 4 is Figure 3 the partial enlarged view at B in

[0025] Figure 5 is the three-dimensional view of the cover plate assembly provided by the present utility model;

[0026] Figure 6 is the exploded view of the cover plate assembly provided by the present utility model.

[0027] In the figure:

[0028] 100, deformation avoidance space;

[0029] 1, pole post riveting block;

[0030] 2, pole post body; 21, riveting part; 22, connecting part; 221, small diameter part; 222, transition part; 223, large diameter part; 23, abutting part;

[0031] 3, battery cover plate;

[0032] 4, upper plastic;

[0033] 5, sealing ring;

[0034] 6, lower plastic. Detailed Embodiments

[0035] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0036] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0037] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0038] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", and "left" are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0039] The following will introduce the pole structure, cover plate assembly, and battery provided by the present utility model according to the attached Figure 1 to the attached Figure 6 drawings.

[0040] As Figures 1 to 3 shown, in this embodiment, the pole structure can be installed on the battery cover plate 3 in a riveting manner, and the battery cover plate 3, the upper plastic 4, and the sealing ring 5 are fixed together.

[0041] Specifically, the battery cover plate 3 has a pole hole, and the pole structure can pass through the pole hole. Among them, the pole structure includes a pole riveting block 1 and a pole body 2. The pole riveting block 1 has a riveting hole, and the pole body 2 can pass through the riveting hole and be riveted and limitedly connected to the pole riveting block 1. As Figure 3 shown, the pole body 2 includes a riveting portion 21, a connecting portion 22, and an abutting portion 23. The riveting portion 21 is connected to one end of the connecting portion 22, and the abutting portion 23 is connected to the other end of the connecting portion 22. The riveting portion 21 can sequentially pass through the pole hole and the riveting hole of the battery cover plate 3 and deform after applying the riveting process, so as to be riveted to the pole riveting block 1, and the battery cover plate 3 is clamped and fixed between the pole riveting block 1 and the abutting portion 23.

[0042] As Figure 3 、 Figure 4 shown, before riveting, the pole riveting block 1, the pole body 2, the battery cover plate 3, the upper plastic 4, and the sealing ring 5 need to be assembled and positioned together before the riveting process can be applied. At this time, a deformation avoidance space 100 can be formed between a part of the outer peripheral surface of the connecting portion 22 and the inner peripheral surface of the pole hole. The deformation avoidance space 100 is used to accommodate the deformation generated by the connecting portion 22 during the riveting process.

[0043] By forming the deformation avoidance space 100 between the connecting portion 22 and the pole hole, the deformation generated by the connecting portion 22 during the riveting process can be accommodated, the pressure of the pole body 2 on the inner wall of the pole hole along its radial direction after riveting can be reduced, thereby reducing the degree of deformation of the pole hole, ensuring the flatness of the end surfaces of the battery cover plate 3 and the pole body 2, being beneficial to the battery cover plate 3 and the sealing ring 5 to achieve good sealing performance, also being beneficial to the assembly and welding between the battery cover plate 3 and the battery housing, and enabling the pole body 2 and the pole riveting block 1 to be closely attached, reducing the resistance between the pole body 2 and the pole riveting block 1.

[0044] As Figure 3 、 Figure 4 shown, in this embodiment, the axial direction of the pole hole is parallel to the thickness direction of the battery cover plate 3, and the longitudinal cross-sectional shape of the pole hole is cylindrical. The diameter of a part of the outer peripheral surface of the connecting portion 22 is smaller than the diameter of the pole hole, thus forming the above-mentioned deformation avoidance space 100. And, the diameter of another part of the outer peripheral surface of the connecting portion 22 is the same as the diameter of the pole hole, so that the connecting portion 22 can abut against the inner peripheral surface of the pole hole, realizing the limit insertion and assembly of the pole body 2 and the pole hole, being beneficial to improving the installation accuracy of the pole body 2 and the structural stability after riveting.

[0045] Exemplarily, the connecting portion 22 includes at least one large-diameter portion 223 and at least one small-diameter portion 221, and the large-diameter portion 223 and the small-diameter portion 221 are arranged along the axial direction of the connecting portion 22. The diameter of the large-diameter portion 223 is larger than that of the small-diameter portion 221, such that the large-diameter portion 223 can abut against the inner peripheral surface of the pole hole, and a deformation avoidance space 100 can be formed between the small-diameter portion 221 and the inner peripheral surface of the pole hole.

[0046] Specifically, in this embodiment, as Figure 4 shown, a transition portion 222 is further connected between the large-diameter portion 223 and the small-diameter portion 221, so that the large-diameter portion 223, the transition portion 222, and the small-diameter portion 221 have a uniformly varying diameter, that is, the connecting portion 22 is in the shape of a frustum of a cone. The uniformly varying diameter enables the deformation of the connecting portion 22 to be relatively uniform during the riveting process, avoiding the phenomenon of poor fluidity of the material of the connecting portion 22 during the riveting process. Preferably, in this embodiment, the connecting portion 22 has a draft angle, and the draft angle is 0 - 10 degrees, so that the material of the connecting portion 22 has better fluidity during the riveting process and enables the connecting portion 22 to vary uniformly.

[0047] Furthermore, the large-diameter portion 223 is located at one end of the connecting portion 22 close to the abutting portion 23, the small-diameter portion 221 is located at one end of the connecting portion 22 close to the riveting portion 21, and the transition portion 222 is connected between the large-diameter portion 223 and the small-diameter portion 221. During the riveting process, the material closer to the riveting end deforms more. Therefore, setting the deformation avoidance space 100 at a position closer to the riveting end can be more conducive to avoiding the inner peripheral surface of the pole hole from being squeezed by the connecting portion 22 during the riveting process, thereby facilitating the prevention of the pole hole from expanding.

[0048] As Figure 4 shown, in this embodiment, before riveting, the end face of the connecting portion 22 for abutting against the pole riveting block 1 is set higher than the top surface of the battery cover plate 3, so that after riveting, the material of the connecting portion 22 can deform and fill the above-mentioned deformation avoidance space 100, such that a large contact area is formed between the connecting portion 22 and the pole hole, thereby ensuring the structural stability after riveting.

[0049] Specifically, the height difference between the end face of the connecting portion 22 for abutting against the pole riveting block 1 and the top surface of the battery cover plate 3 can be determined according to the volume of the connecting portion 22 and the above-mentioned draft angle. Exemplarily, in this embodiment, the draft angle of the connecting portion 22 is 0 - 10 degrees, and the height difference between the end face of the connecting portion 22 for abutting against the pole riveting block 1 and the top surface of the battery cover plate 3 is 0 - 0.5 mm, so that the volume difference between this connecting portion 22 and the "connecting portion 22" of the conventional pole body 2 in the prior art is within ±100 mm³, so that after riveting, the material of the connecting portion 22 can deform and fill the above-mentioned deformation avoidance space 100.

[0050] The present utility model further provides a cover plate assembly, which includes a battery cover plate 3, an upper plastic 4, a sealing ring 5, a lower plastic 6 and the above-mentioned pole column structure. Among them, the pole column body 2 can sequentially pass through the lower plastic 6, the sealing ring 5, the battery cover plate 3, the upper plastic 4 and the pole column riveting block 1, and is riveted and connected to the pole column riveting block 1 to fixedly connect the lower plastic 6, the sealing ring 5, the battery cover plate 3, the upper plastic 4 and the pole column structure.

[0051] By forming a deformation avoidance space 100 between the connecting portion 22 and the pole column hole, the deformation generated by the connecting portion 22 during the riveting process can be accommodated, the pressure of the pole column body 2 on the inner wall of the pole column hole along its radial direction after riveting can be reduced, thereby reducing the degree of deformation of the pole column hole, ensuring the flatness of the end face of the battery cover plate 3 and the pole column body 2, being beneficial to the battery cover plate 3 and the sealing ring 5 to achieve good sealing performance, also being beneficial to the assembly and welding between the battery cover plate 3 and the battery housing, and enabling the pole column body 2 and the pole column riveting block 1 to be closely attached to each other, reducing the resistance between the pole column body 2 and the pole column riveting block 1.

[0052] The present utility model further provides a battery, which includes a battery housing and the above-mentioned cover plate assembly. One end of the battery housing is provided with an opening, and the cover plate assembly is hermetically connected to the opening. This cover plate assembly has better sealing performance and lower deformation degree, can be beneficial to the sealing connection with the battery housing, thereby further improving the sealing performance and reliability of the whole battery and improving the yield rate of production.

[0053] Obviously, the above-mentioned embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limiting the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A pole structure capable of being riveted and mounted on a battery cover (3), characterized in that: The pole structure comprises a pole riveting block (1) and a pole body (2), the pole riveting block (1) having a riveting hole, the pole body (2) comprising a riveting portion (21), a connecting portion (22) and an abutting portion (23), the riveting portion (21) being connected to one end of the connecting portion (22), the abutting portion (23) being connected to the other end of the connecting portion (22), the riveting portion (21) being able to sequentially pass through the pole hole and the riveting hole of the battery cover plate (3) and be riveted to the pole riveting block (1), so as to clamp and fix the battery cover plate (3) between the pole riveting block (1) and the abutting portion (23); Furthermore, before riveting, a deformation avoidance space (100) can be formed between a portion of the outer circumference of the connecting portion (22) and the inner circumference of the pole hole, and the deformation avoidance space (100) is used to accommodate the deformation of the connecting portion (22) generated during the riveting process.

2. The pole structure according to claim 1, characterized in that: Another part of the outer circumference of the connecting portion (22) can abut against the inner circumference of the pole hole, so that the pole body (2) is inserted into the pole hole in a limited position.

3. The pole structure according to claim 2, characterized in that: The axial direction of the pole hole is parallel to the thickness direction of the battery cover plate (3), and the longitudinal cross-section of the pole hole is cylindrical. The connecting portion (22) includes at least one large-diameter portion (223) and at least one small-diameter portion (221), and the large-diameter portion (223) and the small-diameter portion (221) are arranged along the axial direction of the connecting portion (22). The large-diameter portion (223) can abut against the inner circumferential surface of the pole hole, and the small-diameter portion (221) can form the deformation avoidance space (100) with the inner circumferential surface of the pole hole.

4. The pole structure according to claim 3, characterized in that: A transition portion (222) is also connected between the large diameter portion (223) and the small diameter portion (221), so that the large diameter portion (223), the transition portion (222) and the small diameter portion (221) have uniformly changing diameters.

5. The pole structure according to claim 4, characterized in that: The large diameter portion (223) is located at one end of the connecting portion (22) close to the abutting portion (23), the small diameter portion (221) is located at one end of the connecting portion (22) close to the riveting portion (21), and the transition portion (222) is connected between the large diameter portion (223) and the small diameter portion (221).

6. The pole structure according to claim 5, characterized in that: The connecting portion (22) has a draft angle, and the draft angle is 0 degrees to 10 degrees.

7. The pole structure according to any one of claims 1 to 6, characterized in that: Before riveting, the end surface of the connecting portion (22) used for abutting against the pole riveting block (1) is arranged higher than the top surface of the battery cover plate (3).

8. The pole structure according to claim 7, characterized in that: The height difference between the end surface of the connecting portion (22) used to abut against the pole riveting block (1) and the top surface of the battery cover plate (3) is 0 mm-0.5 mm.

9. A cover plate assembly, characterized in that: The invention comprises a battery cover (3), an upper plastic (4), a sealing ring (5), a lower plastic (6) and a pole structure as described in any one of claims 1 to 8, wherein a pole body (2) of the pole structure can sequentially pass through the lower plastic (6), the sealing ring (5), the battery cover (3), the upper plastic (4) and a pole riveting block (1) of the pole structure, and be riveted to the pole riveting block (1) to fix the lower plastic (6), the sealing ring (5), the battery cover (3), the upper plastic (4) and the pole structure.

10. A battery, characterized in that It comprises a battery housing and the cover plate assembly as claimed in claim 9, wherein one end of the battery housing is open and the cover plate assembly is sealed and connected to the opening.

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