Lithium battery top cover

Abstract

The utility model provides a lithium battery top cover which comprises a sealing cover, insulating plates, a positive pole plate, a negative pole plate, an anti-explosion valve, a glue box, a conductive block, a positive pole column, a negative pole column, an expansion sealing mechanism and a sealing ring, the insulating plates are respectively mounted at two ends of the front end surface of the sealing cover, and the positive pole plate and the negative pole plate are mounted on the inner sides of the insulating plates; according to the design, the problems that when a post terminal and a sealing ring are attached too tightly or too loosely in an original device, the sealing ring is possibly deformed, or a gap is formed in the attaching process of a sealing cover, certain liquid leakage risks exist, the requirement for the sizes of the post terminal and the sealing ring is high, and the rejection rate in the part production process is increased are solved; according to the positive and negative pole extension sealing mechanism designed by the utility model, extension reinforcement can be carried out between the pole and the sealing ring after installation is completed, so that the pole, the sealing ring and the sealing cover are better attached, meanwhile, the sealing ring is prevented from being deformed, the risk of liquid leakage of a lithium battery is further reduced, and the rejection rate in pole production is reduced.

Description

Technical Field

[0001] This utility model is a lithium battery top cover, belonging to the field of lithium battery technology. Background Technology

[0002] With the development of electric vehicles, the demand for lithium batteries is gradually increasing. Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. A lithium battery mainly consists of a casing, a cell, and a top cover. The top cover includes a top cover sheet, a lower plastic block, injection-molded parts, terminals, a sealing ring, and an explosion-proof valve. The sealing ring is fitted onto the terminals. The top cover and lower plastic block are fixed together by riveting the terminals and injection-molded parts, maintaining and pressing the sealing ring. The sealing ring is encapsulated between the cover sheet and the terminals, enabling the lithium battery cover structure to achieve insulation and sealing effects.

[0003] Publication number CN219267773U mentions a lithium battery top cover structure. The first sealing ring can buffer the pressure of the pressing component inserted into the mounting hole. With the help of the blocking block, the tightness of the sealing ring structure is limited, which can avoid mechanical damage caused by excessive compression of the first sealing ring to a certain extent. However, if the terminal post and the sealing ring are too tight or too loose, it may cause deformation of the sealing ring or gaps in the sealing cover, both of which may pose a certain risk of leakage. Therefore, the dimensional requirements of the terminal post and the sealing ring are high, which increases the scrap rate of the parts during production. There is an urgent need for a lithium battery top cover to solve the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a lithium battery top cover to solve the problems mentioned in the background. This utility model designs a positive and negative electrode post expansion sealing mechanism, which can expand and reinforce the electrode post and sealing ring after installation, so that the electrode post, sealing ring and sealing cover fit better, while avoiding deformation of the sealing ring, further reducing the risk of lithium battery leakage and reducing the scrap rate in electrode post production.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a lithium battery top cover, comprising a sealing cover, an insulating plate, positive and negative electrode plates, an explosion-proof valve, a plastic box, a conductive block, a positive and negative electrode post extension sealing mechanism, and a sealing ring. Insulating plates are respectively installed at both ends of the front end face of the sealing cover, and positive and negative electrode plates are installed on the inner side of the insulating plates. A plastic box is installed on the rear end face of the sealing cover, and a conductive block is installed on the inner surface of the plastic box. The positive and negative electrode post extension sealing mechanism is installed on the rear end face of the positive and negative electrode plates. A sealing ring is installed on the circumferential surface, and an explosion-proof valve is installed on the front end face of the sealing cover. The positive and negative electrode post expansion sealing mechanism includes positive and negative conductive electrode posts, a drive plate, a ratchet, an expansion plate, a push rod, and a drive rod. The positive and negative conductive electrode posts are installed on the rear end face of the positive and negative electrode posts. The drive plate is installed on the inner surface of the positive and negative conductive electrode posts. The ratchet is installed on the rear end face of the drive plate. Four expansion plates are installed on the circumferential surface of the positive and negative conductive electrode posts. A push rod is installed on the inner surface of each expansion plate. A drive rod is installed on the inner surface of each push rod.

[0006] Furthermore, the rear end face of the positive and negative electrode plates is connected to the front end face of the positive and negative conductive electrode posts, the rear end face of the positive and negative conductive electrode posts is connected to the front end face of the conductive block, the explosion-proof valve passes through the space between the two insulating plates, and the explosion-proof valve passes through the surface of the sealing cover.

[0007] Furthermore, the surface of the drive plate is provided with a drive groove, and each drive rod is installed inside the corresponding drive groove. The inner side of the positive and negative conductive electrode posts is provided with four expansion grooves, and the position of each expansion groove is located inside the corresponding expansion plate. Each push rod is located inside the corresponding expansion groove.

[0008] Furthermore, limiting grooves are respectively formed on the surfaces of the push rod and the drive rod that are close to each other. A corresponding telescopic rod is installed inside each set of limiting grooves. A top pressure spring is installed on the circumferential surface of each telescopic rod, and each top pressure spring is connected to the push rod and the drive rod respectively.

[0009] Furthermore, a drive nut is installed on the rear end face of the ratchet, a pawl seat is installed on the rear end face of the drive plate, a limit pawl is installed at one end of the pawl seat, a return spring is installed on the front and rear end faces of the limit pawl, the return spring is connected to the limit pawl and the pawl seat respectively, the limit pawl meshes with the ratchet, and a nut groove is opened on the rear end face of the positive and negative conductive electrode posts at the position of the drive nut.

[0010] The beneficial effects of this utility model are as follows: This utility model provides a lithium battery top cover. Because it incorporates positive and negative conductive electrode posts, a drive plate, a ratchet, a drive nut, a pawl seat, a limiting pawl, a return spring, an extension plate, a push rod, a telescopic rod, a top pressure spring, and a drive rod, our design improvements and practical use have shown that this device has a reasonable structure and good practicality. The design of a positive and negative electrode post expansion and sealing mechanism enables the expansion and reinforcement between the electrode post and the sealing ring after installation, resulting in a better fit between the electrode post, the sealing ring, and the sealing cover. This also prevents deformation of the sealing ring, further reducing the risk of lithium battery leakage and lowering the scrap rate in electrode post production. Attached Figure Description

[0011] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0012] Figure 1 This is a three-dimensional schematic diagram of the overall structure of a lithium battery top cover according to the present invention;

[0013] Figure 2 This is a rear perspective view of a lithium battery top cover according to the present invention;

[0014] Figure 3 This is a schematic diagram of the connection of the positive and negative electrode extension sealing mechanism of the lithium battery top cover according to this utility model;

[0015] Figure 4 This is a three-dimensional schematic diagram of the positive and negative conductive electrode posts of a lithium battery top cover according to the present invention;

[0016] Figure 5 This is a cross-sectional schematic diagram of the positive and negative conductive electrode posts of a lithium battery top cover according to the present invention.

[0017] Figure 6 This is a schematic diagram of the connection of a lithium battery top cover drive rod according to the present invention;

[0018] Figure 7 This is a three-dimensional schematic diagram of a lithium battery top cover extension plate according to the present invention;

[0019] Figure 8 This is a schematic diagram of the connection of a limiting ratchet for a lithium battery top cover according to the present invention;

[0020] In the diagram: 1-Sealing cover, 2-Insulating plate, 3-Positive and negative electrode plates, 4-Explosion-proof valve, 5-Plastic box, 6-Conductive block, 7-Positive and negative electrode post extended sealing mechanism, 71-Positive and negative conductive electrode posts, 711-Extension groove, 72-Drive plate, 721-Drive groove, 73-Ratchet, 731-Drive nut, 732-Pawl seat, 733-Limiting pawl, 734-Reset spring, 74-Extension plate, 75-Push rod, 751-Telescopic rod, 752-Top pressure spring, 76-Drive rod, 8-Sealing ring. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] Please see Figures 1-8 This utility model provides a technical solution: a lithium battery top cover, including a sealing cover 1, an insulating plate 2, positive and negative electrode plates 3, an explosion-proof valve 4, a plastic box 5, a conductive block 6, a positive and negative electrode post extension sealing mechanism 7, and a sealing ring 8. Insulating plates 2 are respectively installed at both ends of the front end face of the sealing cover 1, and positive and negative electrode plates 3 are installed on the inner side of the insulating plates 2. A plastic box 5 is installed on the rear end face of the sealing cover 1, and a conductive block 6 is installed on the inner surface of the plastic box 5. The positive and negative electrode post extension sealing mechanism 7 is installed on the rear end face of the positive and negative electrode plates 3, and a sealing ring 8 is installed on the circumferential surface of the positive and negative electrode post extension sealing mechanism 7. An explosion-proof valve 4 is installed on the front end face of the sealing cover 1. The positive and negative electrode post extension sealing mechanism 7 includes positive and negative conductive electrode posts 71, a drive plate 72, and a ratchet 73. The device includes an extension plate 74, a push rod 75, and a drive rod 76. Positive and negative conductive electrode posts 71 are mounted on the rear end face of the positive and negative electrode plates 3. A drive plate 72 is mounted on the inner surface of the positive and negative conductive electrode posts 71. A ratchet 73 is mounted on the rear end face of the drive plate 72. Four extension plates 74 are mounted on the circumferential surface of the positive and negative conductive electrode posts 71. A push rod 75 is mounted on the inner surface of each extension plate 74. A drive rod 76 is mounted on the inner surface of each push rod 75. This design solves the problem that when the electrode posts and sealing rings are fitted too tightly or too loosely in the original device, the sealing rings may deform or gaps may appear in the sealing cover, which may lead to a certain risk of leakage. Therefore, the size requirements for the electrode posts and sealing rings are high, which increases the scrap rate of parts during production.

[0023] As the first embodiment of this utility model: the rear end face of the positive and negative electrode plates 3 is connected to the front end face of the positive and negative conductive electrode posts 71, the rear end face of the positive and negative conductive electrode posts 71 is connected to the front end face of the conductive block 6, the explosion-proof valve 4 passes through the space between the two insulating plates 2, and the explosion-proof valve 4 passes through the surface of the sealing cover 1, the surface of the drive plate 72 is provided with a drive groove 721, each drive rod 76 is installed inside the corresponding drive groove 721, the inner side of the positive and negative conductive electrode posts 71 is provided with four expansion grooves 711, and the position of each expansion groove 711 is located inside the corresponding expansion plate 74, each push rod 75 is located inside the corresponding expansion groove 711, the surfaces of the push rod 75 and the drive rod 76 that are close to each other are respectively provided with limit grooves, and each set of limit grooves is equipped with a pair of The telescopic rod 751 is equipped with a top pressure spring 752 on its circumferential surface, and each top pressure spring 752 is connected to the push rod 75 and the drive rod 76 respectively. By adding the telescopic rod 751, the push rod 75 and the drive rod 76 can be prevented from shifting. The rear end face of the ratchet 73 is equipped with a drive nut 731, and the rear end face of the drive plate 72 is equipped with a pawl seat 732. One end of the pawl seat 732 is equipped with a limit pawl 733. The front and rear end faces of the limit pawl 733 are respectively equipped with a return spring 734. The return spring 734 is connected to the limit pawl 733 and the pawl seat 732 respectively. The limit pawl 733 and the ratchet 73 mesh with each other. The rear end face of the positive and negative conductive electrode post 71 is provided with a nut groove at the position of the drive nut 731.

[0024] As a second embodiment of this utility model: After assembling the sealing cover 1, simply insert an Allen wrench into the drive nut 731 and rotate it counterclockwise. The drive nut 731 drives the drive plate 72 to rotate counterclockwise, and the drive plate 72 drives the drive rod 76 to move outward. The drive rod 76 drives the push rod 75 and the extension plate 74 to move outward until the extension plate 74 is in contact with the sealing ring 8 and the top pressure spring 752 is compressed. Then, stop rotating the drive nut 731. When the ratchet 73 rotates, it will push the limit pawl 733 to rotate. The return spring 734 will drive the limit pawl 733 to always be in contact with the surface of the ratchet 73. After the ratchet 73 stops rotating, the limit pawl 733 abuts against the ratchet 73, causing the ratchet 73 to be unable to rotate clockwise, thereby controlling the extension plate 74 to be unable to move inward. At this time, the positive and negative pole extension sealing mechanism 7 will be fully extended and can better fit with the sealing ring 8.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A lithium battery top cover, comprising a sealing cover, an insulating plate, positive and negative electrode plates, an explosion-proof valve, a plastic box, a conductive block, a positive and negative electrode post extended sealing mechanism, and a sealing ring, characterized in that: Insulating plates are installed at both ends of the front end face of the sealing cover. Positive and negative electrode plates are installed on the inner side of the insulating plates. A glue box is installed on the rear end face of the sealing cover. A conductive block is installed on the inner surface of the glue box. A positive and negative electrode post expansion sealing mechanism is installed on the rear end face of the positive and negative electrode plates. A sealing ring is installed on the circumferential surface of the positive and negative electrode post expansion sealing mechanism. An explosion-proof valve is installed on the front end face of the sealing cover. The positive and negative electrode post expansion sealing mechanism includes positive and negative electrode posts, a drive plate, a ratchet, an expansion plate, a push rod, and a drive rod. The positive and negative electrode posts are installed on the rear end face of the positive and negative electrode posts. The drive plate is installed on the inner surface of the positive and negative electrode posts. The ratchet is installed on the rear end face of the drive plate. Four expansion plates are installed on the circumferential surface of the positive and negative electrode posts. A push rod is installed on the inner surface of each expansion plate. A drive rod is installed on the inner surface of each push rod.

2. The top cover of the lithium battery according to claim 1, characterized in that: The rear end face of the positive and negative electrode plates is connected to the front end face of the positive and negative conductive electrode posts, the rear end face of the positive and negative conductive electrode posts is connected to the front end face of the conductive block, the explosion-proof valve passes through the space between the two insulating plates, and the explosion-proof valve passes through the surface of the sealing cover.

3. The top cover of lithium battery according to claim 1, characterized in that: The surface of the drive plate is provided with a drive groove, and each drive rod is installed inside the corresponding drive groove. The inner side of the positive and negative conductive electrode posts is provided with four expansion grooves, and the position of each expansion groove is located inside the corresponding expansion plate. Each push rod is located inside the corresponding expansion groove.

4. The top cover of lithium battery according to claim 1, characterized in that: Limiting grooves are respectively formed on the surfaces of the push rod and the drive rod that are close to each other. A corresponding telescopic rod is installed inside each set of limiting grooves. A top pressure spring is installed on the circumferential surface of each telescopic rod, and each top pressure spring is connected to the push rod and the drive rod respectively.

5. The top cover of lithium battery according to claim 1, characterized in that: A drive nut is installed on the rear end face of the ratchet, and a pawl seat is installed on the rear end face of the drive plate. A limit pawl is installed at one end of the pawl seat. A return spring is installed on the front and rear end faces of the limit pawl, respectively. The return spring is connected to the limit pawl and the pawl seat, respectively. The limit pawl meshes with the ratchet. A nut groove is opened on the rear end face of the positive and negative conductive electrode posts at the position of the drive nut.

Images