Cylindrical battery cover body structure

Abstract

The utility model provides a cylindrical battery cover body structure, and aims to solve the technical problem that the anti-rotation limit of a riveting top cover of an existing cylindrical power battery is insufficient. A first mounting groove is formed in the top surface of a top cover, and a first convex part group is arranged in the first mounting groove; the upper plastic part is provided with a first groove matched with the first convex part group, and the first groove is used for limiting the circumferential movement of the upper plastic part; a second mounting groove is formed in the top surface of the upper plastic part; a second convex part group is arranged in the second mounting groove; the riveting block is provided with a second groove matched with the second convex part group, and the second groove is used for limiting the circumferential movement of the riveting block; the lower plastic part is arranged at the bottom end of the top cover; from bottom to top, the pole sequentially penetrates through the lower plastic part, the top cover, the upper plastic part and the riveting block and is hermetically assembled. Through the occlusion assistance between the inner convex parts and the grooves of the components of the battery cover body, stress counteracting / limiting can be carried out when the riveting block / pole is subjected to rotation impact, so that the pole / riveting block can be prevented from rotating, and the service life of the battery is prolonged.

Description

Technical Field

[0001] This application relates to the field of power battery accessory technology, and in particular to a cylindrical battery cover structure. Background Technology

[0002] Currently, lithium-ion / sodium-ion cylindrical batteries are gradually becoming the mainstream product in the new energy industry due to their advantages such as high energy density, good capacity consistency, and ability to support high-rate charging and discharging. More and more manufacturers are choosing cylindrical batteries with riveted top covers to reduce costs and increase production capacity. Common questions:

[0003] 1. The existing cylindrical power battery riveted top cover structure uses circular poles that are riveted to the top cover. If the anti-rotation limit is insufficient, the busbar will drive the poles / connecting pieces to rotate during long-term vibration / torsion or roller testing after installation in the vehicle. This will directly impact the stability of the battery structure, causing damage to the riveted top cover structure (riveting stability, seal wear, etc.), leading to problems such as top cover leakage, inability to charge and discharge normally, and overcurrent, thus affecting the battery's service life.

[0004] 2. When the anti-rotation structure of the riveted top cover is too complex, it is not conducive to the top cover assembly process and the cost of the top cover will also be higher. Simplifying the top cover structure is one of the ways to reduce costs in the lithium battery industry. Utility Model Content

[0005] To address the aforementioned problems, this application provides a cylindrical battery cover structure, comprising:

[0006] The top cover has a first mounting groove on its top surface, and a first protrusion assembly is provided in the first mounting groove.

[0007] The upper plastic part has a first groove that matches the first protrusion group to restrict the circumferential movement of the upper plastic part; the top surface of the upper plastic part has a second mounting groove; the second mounting groove has a second protrusion group.

[0008] The rivet block is provided with a second groove that matches the second protrusion group to restrict the circumferential movement of the rivet block;

[0009] In this configuration, from bottom to top, the pole passes through the top cover, the upper plastic part, and the riveting block in sequence and is then sealed and assembled.

[0010] Furthermore, the first mounting groove has a plurality of first protrusions on its inner wall along its circumference.

[0011] Furthermore, the second mounting groove has a plurality of second protrusions on its inner wall along its circumference.

[0012] Furthermore, the upper plastic part includes a cylindrical portion and a frustum portion;

[0013] The cylindrical portion is fitted into the first mounting groove, and the rivet block is fitted onto its top surface.

[0014] The frustum portion is coaxial with the cylindrical portion, and the diameter of the top circular end face of the frustum portion is larger than the diameter of the bottom circular end face; the frustum portion extends into the top cover.

[0015] Furthermore, the bottom of the first mounting groove is provided with at least two third grooves, and the bottom end of the cylindrical part is provided with a plug-in part that matches the third groove.

[0016] Furthermore, the top cover and the rivet block are both integrally stamped; the upper plastic part is integrally injection molded.

[0017] Furthermore, the cylindrical battery cover structure also includes a lower plastic component; the lower plastic component is located at the bottom end of the top cover; from bottom to top, the electrode post passes through the lower plastic component, the top cover, the upper plastic component and the riveting block in sequence and is sealed and assembled.

[0018] Furthermore, the pole includes a base and a post;

[0019] The base is designed to fit against the bottom surface of the lower plastic part;

[0020] The column portion is sequentially matched and assembled from bottom to top, passing through the lower plastic part, the top cover, the upper plastic part, and the riveting block.

[0021] Furthermore, the cylindrical battery cover structure also includes a sealing ring; the sealing ring includes a first ring portion and a second ring portion;

[0022] The first ring portion is sealed between the top cover and the base;

[0023] The second ring is sealed between the top cover, the upper plastic part, and the pillar.

[0024] Furthermore, the riveting block has a riveting hole extending through it along its axial direction for the pole post to pass through; the riveting hole is composed of a frustum hole with a cylindrical hole at each end, such that the diameters of the two circular surfaces of the frustum hole are the same as the diameters of the cylindrical holes connected to it, wherein the diameter of the top circular end face of the frustum hole is larger than the diameter of its bottom circular end face; the top surface of the riveting block has a fourth groove coaxial with it, and the fourth groove communicates with the riveting hole.

[0025] Compared with the prior art, the beneficial effects of this utility model are:

[0026] 1) Through the interlocking assistance between the inner protrusions and grooves of each component of the battery cover, stress relief / limitation can be achieved when the rivet block / terminal is subjected to rotational impact, thereby preventing the terminal / rivet block from rotating and improving the battery life.

[0027] 2) The top cover and the rivet block are stamped together as one piece, and the upper and lower plastic parts are injection molded for direct assembly, which simplifies the battery cover structure and reduces the cost. Attached Figure Description

[0028] 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.

[0029] Figure 1 This is a schematic diagram of a cylindrical battery cover structure according to an embodiment of this application;

[0030] Figure 2 This is a cross-sectional view along the A-A' direction of a cylindrical battery cover structure according to an embodiment of this application;

[0031] Figure 3 This is a bottom view schematic diagram of the upper plastic part of a cylindrical battery cover structure according to an embodiment of this application;

[0032] Figure 4 This is a top view schematic diagram of the upper plastic part of a cylindrical battery cover structure according to an embodiment of this application.

[0033] Figure label:

[0034] 1. Top cover; 10. First protrusion group; 2. Upper plastic part; 20. Cylindrical part; 200. Insertion part; 201. Third protrusion; 202. Second mounting hole; 203. Second protrusion group; 204. Second mounting groove; 21. Frustum part; 3. Riveting block; 30. Second groove; 310. Frustum hole; 311. Cylindrical hole; 32. Fourth groove; 4. Lower plastic part; 50. Base; 51. Column part; 60. First ring part; 61. Second ring part. Detailed Implementation

[0035] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0036] In the description of this utility model, it should be understood that the terms "top", "bottom", "upper", "lower", "inner", "outer", "axial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] 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 one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between 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.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature 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 includes the first feature 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.

[0040] The following disclosure provides many different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the present invention. Furthermore, reference numerals may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments discussed. In addition, examples of various specific processes and materials are provided in the present invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0041] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0042] This utility model embodiment provides a cylindrical battery cover structure; please refer to [reference needed]. Figures 1-4 As shown, the cylindrical battery cover structure includes a top cover 1, an upper plastic part 2, a riveting block 3, a lower plastic part 4, and an electrode post.

[0043] Specifically,

[0044] The top cover 1 has a first mounting groove on its top surface, and a first protrusion group 10 is provided on its inner wall along its circumference. The top cover 1 has a first mounting hole through it along its axial direction.

[0045] The upper plastic part 2 includes a cylindrical portion 20 and a frustum portion 21. The cylindrical portion 20 has a first groove on its outer wall along its circumference that matches the first protrusion group 10, thereby restricting the circumferential movement of the upper plastic part 2 placed at the top cover 1. The top surface of the cylindrical portion has a second mounting groove, and the second mounting groove has a second protrusion group 203 on its inner wall along its circumference. The frustum portion 20 is coaxial with the cylindrical portion 21, and the diameter of the top circular end face of the frustum portion is larger than the diameter of the bottom circular end face. The frustum portion 20 is disposed within a first mounting hole. The upper plastic part 2 has a second mounting hole 202 extending through it along its axial direction.

[0046] Furthermore, at least two third grooves are provided at the bottom of the first mounting groove, and at least two insertion parts 200 that match the third grooves are provided at the bottom of the cylindrical part. The alignment of the first groove and the first protrusion group 10 can be achieved by inserting the insertion parts 200 and the third grooves.

[0047] The rivet block 3 is placed in the second mounting groove to allow it to be positioned on the upper plastic part 2. The rivet block 3 has a second groove 30 on its outer wall along its circumference, which matches the second protrusion assembly 203, thus restricting the circumferential movement of the rivet block 3 positioned on the upper plastic part 2. The rivet block 3 has a rivet hole extending through it along its axial direction. The top surface of the rivet block has a fourth groove 32 coaxial with it, and the fourth groove 32 communicates with the rivet hole.

[0048] Furthermore, the riveting hole is composed of a frustum hole 310 with a cylindrical hole 311 at each end, such that the diameters of the two circular surfaces of the frustum hole 310 are the same as the diameters of the cylindrical holes 311 connected to it.

[0049] The lower plastic part 4 is located at the bottom of the top cover and is made of an insulating material, such as plastic. The lower plastic part 4 has a third mounting hole along its axial direction.

[0050] From bottom to top, after the lower plastic part 4, top cover 1, upper plastic part 2, and rivet block 3 are placed in sequence, the third mounting hole, the first mounting hole, the second mounting hole 202 and the rivet hole are set coaxially.

[0051] Furthermore, the top cover 1 and the rivet block 3 are both integrally stamped; the upper plastic part 2 and the lower plastic part 4 are integrally injection molded.

[0052] The terminal post includes a base 50 and a post portion 51. The base 50 is fitted to the bottom surface of the lower plastic part. The post portion 51 is provided to sequentially match and pass through the third mounting hole, the first mounting hole, the second mounting hole 202 and the riveting hole from bottom to top. A sealing ring is provided on the outer side of the post portion to seal the connection between the terminal post and the cylindrical battery cover structure. At the same time, the outer wall of the post portion 51 is fitted to the second mounting hole 202 and the riveting hole.

[0053] Furthermore, the sealing ring includes a first ring portion 60 and a second ring portion 61. The first ring portion 60 seals between the lower plastic part 4 and the base 50, and the second ring portion 61 seals between the top cover 1, the upper plastic part 2 and the pillar portion 51.

[0054] Based on the above embodiments, the assembly steps and working principle of the cylindrical battery cover structure of this application are as follows:

[0055] The assembly steps of the cylindrical battery cover structure are as follows: 1) After the sealing ring is put into the terminal post, the terminal post is placed into the riveting mold for fixture positioning; 2) The base 50 of the terminal post is put into the third mounting hole of the lower plastic part 4, so that the lower plastic part 4 is placed into the riveting mold; 3) The terminal post is put into the first mounting hole, so that the top cover 1 is placed into the riveting mold; 4) The upper plastic part 2 is placed into the first mounting groove on the top surface of the top cover. At this time, the first groove of the upper plastic part 2 is adapted to the first protrusion group 10 of the top cover 1, so that the upper plastic part 2 is placed into the riveting mold; 5) The riveting block 3 is placed into the upper plastic part 2. At this time, the second groove 30 of the riveting block 3 is adapted to the second protrusion group 203 of the upper plastic part 2, so that the riveting block 3 is placed into the riveting mold; 6) The riveting fixture presses down on the riveting block 3 to complete the expansion riveting; the connection between the upper edge of the terminal post and the riveting block 3 can be fixed by laser welding.

[0056] Once the battery cover is installed, its working principle is as follows: during vehicle vibration or roller testing, the plate brings rotational impact to the rivet block 3 / terminal. Through the adaptation between the first groove of the upper plastic part 2 and the first protrusion group 10 of the top cover, and the adaptation between the second protrusion group 203 of the upper plastic part and the second groove 30 of the rivet block, the rotation of the cylindrical battery cover structure is effectively prevented.

[0057] Based on the above embodiments, the advantages of this application are:

[0058] 1) Through the interlocking assistance between the inner protrusions and grooves of each component of the battery cover, stress relief / limiting can be achieved when the rivet block 3 / terminal is subjected to rotational impact, thereby preventing the terminal / rivet block 3 from rotating and improving the battery life.

[0059] 2) The top cover 1 and the rivet block 3 are both integrally stamped and formed, and the upper and lower plastic parts are injection molded and directly assembled, which simplifies the battery cover structure and reduces the cost.

Claims

1. A cylindrical battery cover structure, characterized in that, It includes: The top cover has a first mounting groove on its top surface, and a first protrusion assembly is provided in the first mounting groove. The upper plastic part has a first groove that matches the first protrusion group to restrict the circumferential movement of the upper plastic part; the top surface of the upper plastic part has a second mounting groove; the second mounting groove has a second protrusion group. The rivet block is provided with a second groove that matches the second protrusion group to restrict the circumferential movement of the rivet block; In this configuration, from bottom to top, the pole passes through the top cover, the upper plastic part, and the riveting block in sequence and is then sealed and assembled.

2. The cylindrical battery cover structure according to claim 1, characterized in that: The first mounting groove has a plurality of first protrusions on its inner wall along its circumference.

3. The cylindrical battery cover structure according to any one of claims 1 or 2, characterized in that: The second mounting groove has a plurality of second protrusions on its inner wall along its circumference.

4. The cylindrical battery cover structure according to claim 3, characterized in that: The upper plastic part includes a cylindrical part and a frustum part; The cylindrical portion is fitted into the first mounting groove, and the rivet block is fitted onto its top surface. The frustum portion is coaxial with the cylindrical portion, and the diameter of the top circular end face of the frustum portion is larger than the diameter of the bottom circular end face; the frustum portion extends into the top cover.

5. The cylindrical battery cover structure according to claim 4, characterized in that: The bottom of the first mounting groove is also provided with at least two third grooves, and the bottom end of the cylindrical part is provided with a plug-in part that matches the third groove.

6. The cylindrical battery cover structure according to claim 5, characterized in that: The top cover and the rivet block are both integrally stamped; the upper plastic part is integrally injection molded.

7. The cylindrical battery cover structure according to claim 6, characterized in that: The cylindrical battery cover structure also includes a lower plastic part; the lower plastic part is located at the bottom of the top cover; from bottom to top, the electrode post passes through the lower plastic part, the top cover, the upper plastic part and the riveting block in sequence and is sealed and assembled.

8. The cylindrical battery cover structure according to claim 7, characterized in that: The pole consists of a base and a post. The base is designed to fit against the bottom surface of the lower plastic part; The column portion is sequentially matched and assembled from bottom to top, passing through the lower plastic part, the top cover, the upper plastic part, and the riveting block.

9. The cylindrical battery cover structure according to claim 8, characterized in that: The cylindrical battery cover structure also includes a sealing ring; the sealing ring includes a first ring portion and a second ring portion; The first ring portion is sealed between the top cover and the base; The second ring is sealed between the top cover, the upper plastic part, and the pillar.

10. The cylindrical battery cover structure according to claim 9, characterized in that: The riveting block has a riveting hole extending through it along its axial direction for the pole post to pass through; the riveting hole is composed of a frustum hole with a cylindrical hole at each end, such that the diameters of the two circular surfaces of the frustum hole are the same as the diameters of the cylindrical holes connected to it, wherein the diameter of the top circular end face of the frustum hole is larger than the diameter of its bottom circular end face; the top surface of the riveting block has a fourth groove coaxial with it, and the fourth groove communicates with the riveting hole.

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