Cover plate assembly and battery

Abstract

The utility model provides a kind of cover plate assembly and battery, the cover plate assembly includes cover plate and sealing assembly, is equipped with injection hole on cover plate, sealing assembly includes sealing element, sealing element includes the first sealing subunit and the second sealing subunit being connected with each other, the first sealing subunit is used to seal or open injection hole, the second sealing subunit is located in the side of the first sealing subunit away from injection hole;Wherein, by the axial direction along injection hole, the orthographic projection of the second sealing subunit on the first sealing subunit at least part is located in the circumferential boundary of the first sealing subunit, to reduce the weight of sealing element, improve the operation convenience of sealing assembly in installation and use process;Meanwhile, improve the space utilization of cover plate assembly, provide support for the lightweight, miniaturization design of battery.

Description

Technical Field

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

[0002] As new energy vehicles and energy storage devices develop towards higher power and larger capacity, lithium-ion batteries are widely used due to their advantages such as high energy density and long lifespan. To meet process and sealing requirements, battery covers are usually equipped with injection holes for injecting electrolyte and sealing.

[0003] In related technologies, the sealing structure of the injection hole generally suffers from large structural dimensions and occupies a lot of space, especially in the circumferential or radial directions, occupying a wide layout area, making it difficult to achieve a compact arrangement of the cover plate assembly. On the one hand, the large sealing structure increases the overall size of the cover plate assembly, which is not conducive to the integrated design of the battery module; on the other hand, it limits further optimization of the cover plate in the thickness direction, thus making it difficult to meet the development requirements of lightweight and thin battery systems. Utility Model Content

[0004] The present invention provides a cover plate assembly and a battery to reduce the size of the sealing structure, improve the space utilization of the cover plate assembly, and achieve lightweight and miniaturized battery design.

[0005] To achieve the above functions, the technical solution provided in this embodiment is as follows:

[0006] In a first aspect, this embodiment provides a cover plate assembly, including:

[0007] The cover plate has an injection hole; and

[0008] A sealing assembly includes a seal, the seal including a first sealing sub-part and a second sealing sub-part connected to each other, the first sealing sub-part being adapted to seal or open the injection hole, and the second sealing sub-part being disposed on the side of the first sealing sub-part away from the injection hole;

[0009] Wherein, along the axial direction of the injection hole, at least a portion of the orthographic projection of the second sealing sub-part onto the first sealing sub-part lies within the circumferential boundary of the first sealing sub-part.

[0010] In one embodiment, the sealing assembly further includes an elastic element, wherein one end of the second sealing sub-part away from the first sealing sub-part abuts against the elastic element to drive the first sealing sub-part to reset under the drive of the elastic element to seal the injection hole.

[0011] In one embodiment, the first sealing sub-part includes a sealing outer surface that abuts against the wall of the injection hole;

[0012] The second sealing sub-part includes an abutting bottom surface and an inclined outer surface, the abutting bottom surface being connected to the sealing outer surface via the inclined outer surface, and the abutting bottom surface abutting against the elastic element;

[0013] The angle between the inclined outer surface and the sealed outer surface is greater than or equal to 105 degrees and less than or equal to 175 degrees.

[0014] In one embodiment, the cover plate assembly further includes a baffle plate disposed corresponding to the injection hole, wherein the second sealing sub-part abuts against the baffle plate via the elastic member.

[0015] In one embodiment, the cover plate assembly further includes a support frame disposed between the cover plate and the baffle plate, one end of the support frame being fixedly connected to the cover plate, and the other end of the support frame abutting against the baffle plate;

[0016] The second sealing sub-part abuts against the baffle plate via the elastic element and the support frame in sequence.

[0017] In one embodiment, the support frame includes a support portion and a welding portion connected to each other, the welding portion being disposed between the support portion and the cover plate;

[0018] The support portion is arranged circumferentially around the outside of the elastic member, the welding portion is arranged circumferentially around the support portion, and the welding portion is fixedly connected to the cover plate.

[0019] In one embodiment, the cover plate assembly further includes an insulating member disposed on one side of the cover plate;

[0020] The insulating component has a receiving cavity, and the sealing component, the elastic component, the support frame, and the baffle plate are located within the receiving cavity.

[0021] In one embodiment, the injection hole includes a guide hole and a sealing hole that are connected to each other. The guide hole is disposed on the top surface of the cover plate, and the sealing hole penetrates the cover plate and communicates with the receiving cavity. The diameter of the sealing hole is smaller than that of the guide hole.

[0022] When the sealing member seals the sealing hole, the first sealing sub-part is located inside the sealing hole, and the first sealing sub-part abuts against the wall of the injection hole; when the sealing member opens the sealing hole, an injection channel is formed between the sealing member and the wall of the injection hole, and the injection channel communicates with the receiving cavity.

[0023] In one embodiment, the seal further includes a third sealing sub-part, which is disposed on the side of the first sealing sub-part away from the second sealing sub-part, and is connected to the first sealing sub-part;

[0024] Wherein, the outer circle diameter of the third sealing sub-part is smaller than the diameter of the sealing hole, and along the axial direction of the injection hole, the orthographic projection of the third sealing sub-part on the first sealing sub-part is located within the circumferential boundary of the first sealing sub-part.

[0025] Secondly, this utility model also provides a battery, including the cover plate assembly described in the first aspect embodiment.

[0026] The beneficial effects of the embodiments of this utility model are as follows: This utility model provides a cover plate assembly and a battery. The cover plate assembly includes a cover plate and a sealing assembly. The cover plate has an injection hole. The sealing assembly includes a sealing element, which includes a first sealing sub-part and a second sealing sub-part connected to each other. The first sealing sub-part is used to seal or open the injection hole, and the second sealing sub-part is used to drive the first sealing sub-part to reset to seal the injection hole, thereby realizing the opening and sealing of the injection hole and reducing the complexity of battery replenishment operation. In particular, by having at least a portion of the orthographic projection of the second sealing sub-part onto the first sealing sub-part located within the circumferential boundary of the first sealing sub-part along the axial direction of the injection hole, the weight of the sealing element is reduced, and the ease of operation of the sealing assembly during installation and use is improved. At the same time, the space utilization rate of the cover plate assembly is improved, providing support for the lightweight and miniaturized design of the battery. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in this embodiment, the accompanying drawings used in the description of the embodiment will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the cover plate assembly provided in an embodiment of the present utility model;

[0029] Figure 2 A top view of the cover plate assembly provided in an embodiment of this utility model;

[0030] Figure 3 This is a first exploded view of the cover plate assembly provided in an embodiment of the present utility model;

[0031] Figure 4 This is a schematic diagram of the structure of the sealing element provided in the embodiment of this utility model;

[0032] Figure 5Provided for the embodiments of this utility model Figure 2 A schematic diagram of the first type of cross-section at point AA';

[0033] Figure 6 Provided for the embodiments of this utility model Figure 5 Enlarged view of point B in the middle;

[0034] Figure 7 Provided for the embodiments of this utility model Figure 2 A schematic diagram of the second type of cross-section at point AA';

[0035] Figure 8 Provided for the embodiments of this utility model Figure 7 Enlarged view of point C in the middle;

[0036] Figure 9 This is a second exploded view of the cover plate assembly provided in an embodiment of the present utility model;

[0037] Figure 10 Provided for the embodiments of this utility model Figure 2 A schematic diagram of the third cross-section at point AA';

[0038] Figure 11 Provided for the embodiments of this utility model Figure 10 Enlarged view at point D;

[0039] Figure 12 Provided for the embodiments of this utility model Figure 2 A schematic diagram of the fourth cross-section at point AA';

[0040] Figure 13 Provided for the embodiments of this utility model Figure 12 Enlarged view at point E in the middle;

[0041] Figure 14 This is a schematic diagram of the support frame provided in an embodiment of the present utility model;

[0042] Figure 15 This is a schematic diagram of the battery structure provided in an embodiment of the present invention.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1-Cover assembly; 11-Cover; 12-Sealing assembly; 13-Insulator; 14-Terminal post; 15-Sealing ring; 16-Explosion-proof sheet; 17-Explosion-proof hole; 18-Baffle plate; 19-Support frame; 111-Injection hole; 1111-Guide hole; 1112-Sealing hole; 121-Sealing element; 1211-First sealing sub-part; 1211A-Sealing outer surface; 1212-Second sealing sub-part; 1212A-Abutting bottom surface; 1212B-Inclined outer surface; 1213-Third sealing sub-part; 122-Elastic element; 131-Receiving cavity; 123-Injection channel; 191-Support part; 1911-Through hole; 192-Welding part; 2-Battery; 21-Battery casing. Detailed Implementation

[0045] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0046] Please combine Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 It should be noted that, Figure 5 and Figure 6 The attached diagram is a structural schematic of the seal when the seal is sealing the injection hole. At this time, the seal and the hole wall of the injection hole abut against each other, thereby forming a reliable seal for the injection hole. Figure 7 and Figure 8 The attached diagram shows the structure of the seal when the sealing hole is opened, at which point an injection channel is formed between the seal and the wall of the injection hole.

[0047] This embodiment provides a cover plate assembly 1, which is disposed on the top of the battery housing 21 and serves as a sealing structure for the battery 2. Together with the battery housing 21, it forms a sealed cavity environment, thereby providing a stable, sealed and safe working space for the inside of the battery 2 and improving the operational reliability and environmental adaptability of the battery cell.

[0048] The cover plate assembly 1 includes a cover plate 11, a sealing assembly 12, an insulating component 13, an electrode post (not shown in the figure), an electrode post terminal 14, a sealing ring 15, an explosion-proof sheet 16, and an explosion-proof hole 17. The cover plate 11 has an injection hole 111, which is used to inject electrolyte during the battery 2 production process or to replenish the electrolyte in the later stages of battery 2 use. Specifically, the injection hole 111 provides a controllable channel for replenishing electrolyte inside the battery cell, enabling timely replenishment of electrolyte in the later stages of battery 2 cycling, thereby improving ion transport conditions, delaying performance degradation, and improving the convenience of battery 2 maintenance and its service life.

[0049] The sealing assembly 12 is used to seal or open the injection hole 111. The sealing assembly 12 includes a sealing element 121, which includes a first sealing sub-part 1211 and a second sealing sub-part 1212 connected to each other. The first sealing sub-part 1211 is adapted to seal or open the injection hole 111. The second sealing sub-part 1212 is located on the side of the first sealing sub-part 1211 away from the injection hole 111. The second sealing sub-part 1212 is adapted to drive the first sealing sub-part 1211 to reset and seal the injection hole 111, thereby achieving a reliable sealing and reusable opening function for the injection hole 111. When the injection hole 111 is repeatedly opened, the injection hole 111 provides a controllable fluid channel for the electrolyte replenishment operation inside the cell, enabling timely replenishment of electrolyte during the capacity decay stage of the battery 2, thereby improving the wetting state and ion transport conditions of the negative electrode area and avoiding adverse reactions such as "lithium plating" caused by electrolyte drying.

[0050] Specifically, the material of the sealing element 121 includes, but is not limited to, one of fluororubber, silicone rubber, EPDM rubber, polytetrafluoroethylene, or polyurethane elastomer; along the axial direction of the injection hole 111, at least a portion of the orthographic projection of the second sealing sub-part 1212 onto the first sealing sub-part 1211 is located within the circumferential boundary of the first sealing sub-part 1211, thereby making the structure of the sealing element 121 more compact, avoiding space waste caused by the excessive circumferential size of the sealing element 121, thereby reducing the weight of the sealing element 121 and improving the ease of operation of the sealing element 121 during assembly and use (during the electrolyte replenishment process); at the same time, it can also improve the space utilization of the cover plate assembly 1, providing support for the lightweight and miniaturized design of the battery 2.

[0051] In one embodiment, the sealing assembly 12 further includes an elastic element 122, and the second sealing sub-part 1212 is adapted to abut against the elastic element 122 so that the first sealing sub-part 1211 is reset under the drive of the elastic element 122 to seal the injection hole 111, thereby realizing the sealing and opening of the injection hole 111, improving the ease of operation and sealing reliability.

[0052] Specifically, the elastic element 122 includes, but is not limited to, springs, elastic rubber pads, corrugated sheets, or other material structures with elastic recovery function. The elastic element 122 is used to axially compress the seal 121 when it is subjected to pressure from the injection direction (i.e., along the axial direction of the injection hole 111, from the outside of the cover plate assembly 1 to the inside of the battery 2).

[0053] When an external force is applied to the seal 121, causing the seal 121 to move axially downward along the injection hole 111, the elastic element 122 is compressed accordingly, forming a gap between the seal 121 and the wall of the injection hole 111, thereby forming an injection channel 123 for replenishing electrolyte. Electrolyte is injected from the outside of the battery 2 into the inside of the battery 2 through the injection channel 123, realizing the electrolyte replenishment operation of the battery 2.

[0054] After the operation is completed and the external force is released, the elastic element 122 returns to its original state, and the sealing element 121 rebounds upward along the axial direction of the injection hole 111 under the drive of the elastic element 122. During this process, the first sealing sub-part 1211 moves upward along the axial direction of the injection hole 111 from the area below the injection hole 111 (i.e., the area located below the opening of the injection hole 111 and close to the inside of the battery 2) until the sealing outer surface 1211A is tightly fitted again with the hole wall of the injection hole 111, thereby completing the resealing of the injection hole 111 and ensuring the airtightness and safety of the battery 2.

[0055] Furthermore, the first sealing sub-part 1211 includes a sealing outer surface 1211A, which is adapted to abut against the wall of the injection hole 111; the second sealing sub-part 1212 includes an abutting bottom surface 1212A and an inclined outer surface 1212B, the abutting bottom surface 1212A being connected to the sealing outer surface 1211A via the inclined outer surface 1212B, and the abutting bottom surface 1212A being adapted to abut against the elastic member 122, thereby pushing the first sealing sub-part 1211 back to its original position when the elastic member 122 releases its elastic force, while reducing wear on the end region of the elastic member 122.

[0056] The angle between the inclined outer surface 1212B and the sealing outer surface 1211A is greater than or equal to 105 degrees and less than or equal to 175 degrees. Specifically, the angle between the inclined outer surface 1212B and the sealing outer surface 1211A can be any one of 105 degrees, 115 degrees, 125 degrees, 135 degrees, 145 degrees, 155 degrees, 165 degrees, or 175 degrees. By setting the above angle, the transition area between the second sealing sub-part 1212 and the first sealing sub-part 1211 forms a relatively gentle inclined profile, avoiding sharp corners or abrupt structural changes. This allows the sealing element 121 to maintain a smooth and stable movement path during pressing or rebound reset, improving the guiding performance and force uniformity of the sealing element 121, and preventing problems such as jamming or displacement of the sealing element 121 within the injection hole 111 during pressing or reset.

[0057] It is understood that by providing an inclined outer surface 1212B on the second sealing sub-part 1212, the sealing member 121 can adaptively enter the injection hole 111 under the guidance of the inclined outer surface 1212B during insertion or pressing, avoiding the occurrence of jamming, thereby reducing the friction and interference between the sealing member 121 and the hole wall of the injection hole 111, reducing potential damage to the hole wall of the injection hole 111, and improving the smoothness and reliability during initial installation or electrolyte replenishment.

[0058] In one embodiment, the insulating member 13 is disposed on one side of the cover plate 11. The insulating member 13 can serve as a plastic part in the cover plate assembly 1 to achieve electrical isolation between the battery cell and the external circuit. The insulating member 13 has a receiving cavity 131, which is adapted to accommodate the sealing member 121 and the elastic member 122 and is connected to the injection hole 111. During the replenishment process, the electrolyte can enter the battery 2 through the injection hole 111 and the receiving cavity 131 in sequence, reducing flow resistance, improving injection efficiency and uniformity, and improving the wetting effect and electrochemical performance of each functional area inside the battery 2.

[0059] Furthermore, the cover plate assembly 1 also includes a baffle plate 18, which is disposed in the receiving cavity 131 and corresponds to the injection hole 111. The baffle plate 18 can be used to block the direct upward rush of electrolyte during the injection process, preventing the liquid from entering an irregular movement state due to excessive flow rate or bubble disturbance, thereby reducing the probability of liquid backflow, splashing or air resistance, and improving the stability and fluid control accuracy of the injection process.

[0060] Specifically, the baffle 18 is disposed between the elastic member 122 and the insulating member 13. The second sealing sub-part 1212 is adapted to abut against the baffle 18 via the elastic member 122. The baffle 18 can provide a stable support reference surface for the elastic member 122, thereby providing a reliable reverse support force for the elastic member 122 during the rebound process of the sealing member 121, guiding the sealing member 121 to accurately reset to the sealing position along the axial direction of the injection hole 111, thereby improving the sealing reliability and reusability of the sealing assembly 12. At the same time, the elastic member 122 can be directly supported by the baffle 18 without the need for additional fixing parts, thereby simplifying the structural design of the cover plate assembly 1, reducing manufacturing and assembly costs, and improving the compactness and production efficiency of the cover plate assembly 1.

[0061] Furthermore, the injection hole 111 includes a guide hole 1111 and a sealing hole 1112 that are connected to each other. The guide hole 1111 is disposed on the top surface of the cover plate 11, and the sealing hole 1112 penetrates the cover plate 11 and communicates with the receiving cavity 131. The diameter of the sealing hole 1112 is smaller than the diameter of the guide hole 1111, thereby forming a stepped hole structure in the injection hole 111 that gradually shrinks from large to small along its axial direction. This achieves precise guidance for the insertion process of the sealing member 121 and improves the alignment accuracy between the sealing member 121 and the injection hole 111. At the same time, it provides sufficient space for the downward movement of the sealing member 121 during the pressing process, avoiding jamming due to interference or friction, and improving the smoothness of operation and sealing reliability of the sealing assembly 12.

[0062] It is understood that when the sealing member 121 seals the sealing hole 1112, the first sealing sub-part 1211 is located inside the sealing hole 1112, and the first sealing sub-part 1211 abuts against the hole wall of the injection hole 111; when the sealing member 121 opens the sealing hole 1112, the first sealing sub-part 1211 is spaced apart from the injection hole 111, and an injection channel 123 is formed between the sealing member 121 and the hole wall of the injection hole 111. The injection channel 123 communicates with the receiving cavity 131, and electrolyte can be injected from the outside of the battery 2 into the inside of the battery 2 through the injection channel 123 to realize the electrolyte replenishment operation of the battery 2.

[0063] Specifically, the guide hole 1111 and the sealing hole 1112 are coaxially arranged, thereby reducing the risk of interference or misalignment when the injection nozzle of the injection machine is aligned with the injection hole 111 during the battery 2 replenishment process, and improving the accuracy and efficiency of the injection operation.

[0064] The guide hole 1111 is a conical hole, and the diameter of the guide hole 1111 gradually decreases along its axial direction, forming a funnel-shaped structure from wide to narrow. This facilitates the smooth insertion of the injection nozzle of the injection machine into the guide hole 1111 without deviation or jamming. The sealing hole 1112 is a circular hole structure, which facilitates the movement of the sealing element 121 up and down along the thickness direction of the cover plate assembly 1. At the same time, it ensures that a stable and reliable sealing fit is formed between the sealing element 121 and the hole wall of the sealing hole 1112, thereby improving sealing performance and reusability.

[0065] It is understood that when the sealing element 121 seals the sealing hole 1112, the first sealing sub-part 1211 is located inside the sealing hole 1112, and the first sealing sub-part 1211 abuts against the hole wall of the injection hole 111 to form a reliable sealing structure, preventing electrolyte leakage or external impurities from entering the battery 2, and ensuring the airtightness and safety of the internal environment of the battery 2. At the same time, by designing the guide hole 1111 as a tapered structure that gradually tapers from top to bottom, the injection nozzle of the injection machine can be more easily aligned with the axis of the guide hole 1111, reducing the risk of interference or misalignment during the alignment process, simplifying the injection operation steps, and improving the efficiency and controllability of the replenishment operation. Furthermore, it can also reduce the contact friction between the injection nozzle and the sealing element 121 and its surrounding structure, thereby extending the service life of the sealing assembly 12 and improving the reliability and reusability of the sealing assembly 12.

[0066] Furthermore, the sealing element 121 further includes a third sealing sub-part 1213, which is disposed on the side of the first sealing sub-part 1211 away from the second sealing sub-part 1212, and is connected to the first sealing sub-part 1211; wherein, the outer diameter of the third sealing sub-part 1213 is smaller than the diameter of the sealing hole 1112, and along the axial direction of the injection hole 111, the orthographic projection of the third sealing sub-part 1213 on the first sealing sub-part 1211 is located within the circumferential boundary of the first sealing sub-part 1211.

[0067] It is understood that when an external force is applied to the seal 121, causing the seal 121 to move downward along the axial direction of the injection hole 111, the elastic element 122 is compressed accordingly, causing the first sealing sub-part 1211 to be spaced apart from the injection hole 111. At the same time, the third sealing sub-part 1213 moves downward with the first sealing sub-part 1211 and enters the sealing hole 1112. During this process, a gap is formed between the first sealing sub-part 1211 and the hole wall of the injection hole 111, thereby forming an injection channel 123 for replenishing electrolyte. Electrolyte is injected from the outside of the battery 2 to the inside of the battery 2 through the injection channel 123, realizing the electrolyte replenishment operation of the battery 2.

[0068] After the operation is completed and the external force is removed, the elastic element 122 returns to its original state, and the sealing element 121 rebounds upward along the axial direction of the injection hole 111 under the drive of the elastic element 122. During this process, since the outer diameter of the third sealing sub-part 1213 is smaller than the diameter of the sealing hole 1112, the third sealing sub-part 1213 can smoothly disengage from the sealing hole 1112 without jamming, so that the first sealing sub-part 1211 returns to the inside of the injection hole 111 and fits tightly against the hole wall, thereby completing the resealing of the injection hole 111 and ensuring the airtightness and long-term reliability of the battery 2 structure.

[0069] Please combine Figure 1 , Figure 2 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 and Figure 14 It should be noted that, Figure 10 and Figure 11 The attached figure is a structural schematic diagram of the sealing element 121 sealing the injection hole 111. At this time, the sealing element 121 abuts against the hole wall of the injection hole 111, thereby forming a reliable seal on the injection hole 111. Figure 12 and Figure 13 The attached figure is a schematic diagram of the structure of the seal 121 when the sealing hole 1112 is opened. At this time, a liquid injection channel 123 is formed between the seal 121 and the hole wall of the liquid injection hole 111.

[0070] In one embodiment, the cover plate assembly 1 further includes a support frame 19, which is disposed between the cover plate 11 and the baffle plate 18 and located within the receiving cavity 131. One end of the support frame 19 is fixedly connected to the cover plate 11, and the other end of the support frame 19 abuts against the baffle plate 18. The second sealing sub-part 1212 is adapted to abut against the baffle plate 18 sequentially via the elastic member 122 and the support frame 19. This provides rigid support for the elastic member 122 by providing the support frame 19, preventing displacement, fatigue deformation, or crushing of the elastic member 122 due to lack of effective support during prolonged use or repeated pressure. Simultaneously, it prevents the elastic member 122 from directly acting on the baffle plate 18, thus preventing local deformation or material failure of the baffle plate 18 due to continuous stress, thereby improving the structural strength and long-term reliability of the cover plate assembly 1.

[0071] Furthermore, the receiving cavity 131 is adapted to accommodate the sealing element 121, the elastic element 122, the support frame 19, and the baffle plate 18. The support frame 19 is arranged circumferentially around the sealing assembly 12. That is, the support frame 19 can be arranged in a ring or frame structure surrounding the sealing element 121, so as to provide stable lateral limiting support for the sealing assembly 12 without interfering with the up and down movement of the sealing assembly 12, preventing the sealing assembly 12 from shifting or tilting laterally during the force process, and improving the guiding accuracy and reset stability of the sealing assembly 12 in the axial direction of the injection hole 111.

[0072] Specifically, the support frame 19 can be made of high-strength materials (such as stainless steel, aluminum alloy, reinforced nylon, or glass fiber reinforced plastic) to ensure that the support frame 19 will not deform or break during long-term use, and to maintain structural stability and support strength when subjected to stress generated by repeated elastic deformation of the elastic element 122; the support frame 19 positions and supports the elastic element 122, thereby enhancing the mechanical strength of the sealing assembly 12 and improving the movement guidance and stability of the sealing element 121 during compression or rebound.

[0073] Furthermore, the support frame 19 includes a support portion 191 and a welding portion 192 connected together. The welding portion 192 is disposed between the support portion 191 and the cover plate 11. One end of the support portion 191 is fixedly connected to the welding portion 192, and the other end of the support portion 191 abuts against the baffle plate 18. The support portion 191 and the welding portion 192 can be integrally formed to simplify the processing and assembly process and improve the structural strength and stability. The support portion 191 is circumferentially arranged around the outside of the elastic member 122 to provide uniform lateral support and axial limiting for the elastic member 122. The welding portion 192 is circumferentially arranged around the support portion 191 and is firmly connected to the cover plate 11, thereby reliably fixing the support frame 19 in the receiving cavity 131 and improving the structural integrity and long-term reliability of the cover plate assembly 1.

[0074] Specifically, the support portion 191 is a sleeve-type structure that surrounds the periphery of the sealing member 121 in the circumferential direction, providing lateral limiting and stable support for the sealing member 121 and the elastic member 122; the welding portion 192 is disposed on the side of the support portion 191 near the cover plate 11 and surrounds the opening of the support portion 191; wherein, the side of the welding portion 192 near the cover plate 11 is flush with the side of the insulating member 13 near the cover plate 11, thereby ensuring that the support frame 19 and the insulating member 13 maintain the same positioning reference in the vertical direction, and improving the fitting and installation accuracy between the support frame 19 and the insulating member 13.

[0075] It should be noted that the welding part 192 can be fixedly connected to the cover plate 11 by spot welding, laser welding or ultrasonic welding to ensure that the welding is firm and reliable and to avoid the support frame 19 from loosening or failing due to long-term use or thermal stress.

[0076] Furthermore, the support portion 191 is provided with a plurality of liquid passage holes 1911, which are distributed circumferentially along the support portion 191 and surround the sealing member 121; the baffle plate 18 is provided with a plurality of mesh holes corresponding to the liquid passage holes 1911, and the liquid passage holes 1911 and the mesh holes are interconnected, thereby forming a through liquid flow path between the support frame 19 and the baffle plate 18. Thus, during the replenishment process, the electrolyte can pass through the support frame 19 and the baffle plate 18 and enter the battery 2, improving the replenishment efficiency and fluid distribution uniformity.

[0077] Specifically, the liquid passage 1911 can be circular, elliptical or strip-shaped, and its distribution position and number can be flexibly set according to the liquid replenishment efficiency and structural strength requirements; the mesh is used to allow liquid to pass through while performing preliminary filtration of particulate impurities or foam, ensuring the purity of the electrolyte injected into the battery cell, and preventing foreign objects from entering the battery cell and causing performance degradation or safety hazards.

[0078] Please continue, please combine Figures 1 to 15 This embodiment also provides a battery 2, including a battery casing 21, a cell assembly (not shown in the figure), a protective film (not shown in the figure), and a cover plate assembly 1 as described in any of the above embodiments.

[0079] The battery housing 21 has a mounting cavity; the battery cell assembly is mounted in the mounting cavity; the protective film is located in the mounting cavity and covers the outer surface of the battery cell assembly; the cover plate assembly 1 is used to seal the mounting cavity.

[0080] It is understood that the cover plate assembly 1 has been described in detail in the above embodiments and will not be repeated here; in particular, since the battery 2 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated here.

[0081] It should be noted that the type of battery 2 can be flexibly selected according to the needs of the actual application scenario, and the battery 2 can be adapted to a variety of electrical devices. Specifically, since the battery 2 provided in this embodiment has the characteristics of stable structure and high assembly precision, it can meet the differentiated performance requirements of different electrical devices for the battery 2. Therefore, the electrical devices can include, but are not limited to, at least one of vehicles, energy storage power supplies, consumer electronics, medical devices, or smart city devices. In this embodiment, the specific type of electrical device is not limited, and can be adapted and selected according to the actual application scenario.

[0082] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A cover plate assembly (1) characterized in that, include: The cover plate (11) has an injection hole (111); and A sealing assembly (12) includes a sealing element (121), the sealing element (121) including a first sealing sub-part (1211) and a second sealing sub-part (1212) connected to each other, the first sealing sub-part (1211) being adapted to seal or open the injection hole (111), and the second sealing sub-part (1212) being disposed on the side of the first sealing sub-part (1211) away from the injection hole (111); Wherein, along the axial direction of the injection hole (111), at least a portion of the orthographic projection of the second sealing sub-part (1212) onto the first sealing sub-part (1211) lies within the circumferential boundary of the first sealing sub-part (1211).

2. The cover plate assembly (1) according to claim 1, characterized in that The sealing assembly (12) further includes an elastic element (122), and the end of the second sealing sub-part (1212) away from the first sealing sub-part (1211) abuts against the elastic element (122) so that the first sealing sub-part (1211) is reset under the drive of the elastic element (122) to seal the injection hole (111).

3. The cover plate assembly (1) according to claim 2, characterized in that The first sealing sub-part (1211) includes a sealing outer surface (1211A), which abuts against the wall of the injection hole (111); The second sealing sub-part (1212) includes an abutting bottom surface (1212A) and an inclined outer surface (1212B). The abutting bottom surface (1212A) is connected to the sealing outer surface (1211A) through the inclined outer surface (1212B). The abutting bottom surface (1212A) abuts against the elastic member (122). The angle between the inclined outer surface (1212B) and the sealing outer surface (1211A) is greater than or equal to 105 degrees and less than or equal to 175 degrees.

4. The cover plate assembly (1) according to claim 2, characterized in that The cover plate assembly (1) further includes a baffle plate (18) which is provided corresponding to the injection hole (111), wherein the second sealing sub-part (1212) abuts against the baffle plate (18) through the elastic member (122).

5. The cover plate assembly (1) according to claim 4, characterized in that The cover plate assembly (1) further includes a support frame (19), which is disposed between the cover plate (11) and the baffle plate (18). One end of the support frame (19) is fixedly connected to the cover plate (11), and the other end of the support frame (19) abuts against the baffle plate (18). The second sealing sub-part (1212) abuts against the baffle plate (18) in sequence through the elastic member (122) and the support frame (19).

6. The cover plate assembly (1) according to claim 5, characterized in that The support frame (19) includes a support part (191) and a welding part (192) connected to each other, and the welding part (192) is disposed between the support part (191) and the cover plate (11); The support part (191) is arranged circumferentially around the outside of the elastic member (122), the welding part (192) is arranged circumferentially around the support part (191), and the welding part (192) is fixedly connected to the cover plate (11).

7. The cover plate assembly (1) according to claim 5, characterized in that The cover plate assembly (1) further includes an insulating member (13), which is disposed on one side of the cover plate (11); The insulating component (13) has a receiving cavity (131), and the sealing component (121), the elastic component (122), the support frame (19) and the baffle plate (18) are located in the receiving cavity (131).

8. The cover plate assembly (1) according to claim 7, characterized in that The injection hole (111) includes a guide hole (1111) and a sealing hole (1112) that are connected. The guide hole (1111) is located on the top surface of the cover plate (11). The sealing hole (1112) penetrates the cover plate (11) and communicates with the receiving cavity (131). The diameter of the sealing hole (1112) is smaller than that of the guide hole (1111). When the sealing member (121) seals the sealing hole (1112), the first sealing sub-part (1211) is located inside the sealing hole (1112), and the first sealing sub-part (1211) abuts against the wall of the injection hole (111); when the sealing member (121) opens the sealing hole (1112), an injection channel (123) is formed between the sealing member (121) and the wall of the injection hole (111), and the injection channel (123) communicates with the receiving cavity (131).

9. The cover plate assembly (1) according to claim 8, characterized in that The sealing element (121) further includes a third sealing sub-part (1213), which is disposed on the side of the first sealing sub-part (1211) away from the second sealing sub-part (1212), and the third sealing sub-part (1213) is connected to the first sealing sub-part (1211). Wherein, the outer circle diameter of the third sealing sub-part (1213) is smaller than the diameter of the sealing hole (1112), and along the axial direction of the injection hole (111), the orthographic projection of the third sealing sub-part (1213) on the first sealing sub-part (1211) is located within the circumferential boundary of the first sealing sub-part (1211).

10. A battery (2) characterized by Includes the cover plate assembly (1) as described in any one of claims 1 to 9.

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