Sealing structure and battery cell

Abstract

The application relates to the technical field of lithium battery production, and provides a sealing structure and a battery cell. The sealing structure of the application is arranged at a liquid injection hole of a battery cell cover plate. The sealing structure comprises a connecting seat, a fastener and a sealing element. The connecting seat is fixedly connected to the battery cell cover plate, and a through hole communicating with the liquid injection hole is arranged on the connecting seat. At least part of the hole wall of the through hole is provided with an internal thread. The fastener is provided with an external thread, and the fastener is screwed into the through hole through the internal thread and the external thread. The sealing element is arranged at least between the battery cell cover plate and the fastener, and the sealing element is used for sealing the liquid injection hole. The sealing structure of the application can not only guarantee the sealing effect of the liquid injection hole, but also can remove the sealing of the liquid injection hole through the dismounting of the fastener, so that the battery cell can be injected with liquid or supplemented with liquid for multiple times, and the application has good use effect.

Description

Technical Field

[0001] This application relates to the field of lithium battery technology, and in particular to a sealing structure. This application also relates to a battery cell equipped with the aforementioned sealing structure. Background Technology

[0002] Electrolyte, a crucial component of lithium batteries, plays a vital role in conducting electrons between the positive and negative electrodes, ensuring the high voltage and high specific energy of lithium-ion batteries. During charge-discharge cycles, the electrolyte continuously reacts with the electrodes, being consumed and decomposed. As the amount of electrolyte decreases, the battery's internal electronic conductivity declines, leading to a decrease in electrical performance and consequently, a reduction in battery lifespan.

[0003] In lithium-ion battery structures, after electrolyte injection, formation, and possible top-up operations, the injection port is typically sealed with rubber studs and welded aluminum sealing sheets to prevent electrolyte leakage and the intrusion of external impurities, thereby ensuring battery safety and performance. However, while this method effectively seals the injection port, it is a one-time, non-removable, permanent seal. This means that once the battery has been initially filled and sealed, it cannot be reopened for top-up or multiple filling operations, significantly limiting the battery's reusability and lifespan. Utility Model Content

[0004] In view of this, this application aims to provide a sealing structure to facilitate multiple electrolyte injection and replenishment of the battery cell.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: A sealing structure is installed at the liquid injection hole of the battery cell cover plate, the sealing structure including a connecting seat, fasteners and sealing elements; The connecting seat is fixed to the cell cover plate, and the connecting seat is provided with a through hole connected to the liquid injection hole, and at least a portion of the hole wall of the through hole is provided with internal threads; The fastener has an external thread, and the fastener is screwed into the through hole via the internal thread and the external thread; The sealing element is at least disposed between the cell cover plate and the fastener, and the sealing element is used to seal the injection hole.

[0006] Furthermore, a reinforcing ring is provided in the through hole, and the reinforcing ring is arranged coaxially with the through hole; the internal thread is formed on the inner wall of the reinforcing ring.

[0007] Furthermore, the hardness of the reinforcing ring is greater than the hardness of the connecting seat.

[0008] Furthermore, the reinforcing ring is made of plastic; the reinforcing ring is integrally formed with the connecting seat; and / or, an anti-rotation structure is provided between the reinforcing ring and the connecting seat.

[0009] Furthermore, the sealing element includes a sealing ring disposed on the fastener or the cell cover plate, the inner diameter of the sealing ring being larger than the diameter of the through hole; or, the sealing element includes a sealing gasket disposed between the fastener and the cell cover plate, the sealing gasket being capable of sealing the through hole.

[0010] Furthermore, the seal also includes a rubber plug that is interference-fitted into the injection hole.

[0011] Furthermore, the fastener has an operating part at the end away from the injection hole, which is used to cooperate with an external tool to screw the fastener into the through hole.

[0012] Furthermore, the battery cell cover plate is provided with a sink groove, which is connected to the liquid injection hole; the connecting seat is fixedly connected to the sink groove.

[0013] Furthermore, the battery cell cover plate is provided with a first hole, a second hole and the injection hole in sequence along the injection direction. The diameter of the first hole is larger than the diameter of the second hole, and the diameter of the second hole is larger than the diameter of the injection hole. The connecting seat is fixedly connected to the second hole.

[0014] Compared with related technologies, this application has the following advantages: (1) The sealing structure described in this application, through the provided connecting seat, fastener, and sealing element, allows the connecting seat to be fixedly connected to the cell cover plate, and a through hole connected to the liquid injection hole on the cell cover plate is provided on the connecting seat. At least part of the hole wall of the through hole is provided with internal threads, the fastener is provided with external threads, and the sealing element is provided at least between the cell cover plate and the fastener. In this way, the fastener is screwed onto the connecting seat through the cooperation of the internal and external threads, and the sealing element seals the liquid injection hole. This structure not only provides a good seal at the liquid injection hole, but also facilitates the disassembly of the fastener by using the screw connection between the fastener and the connecting seat, so that the liquid injection hole can be unsealed, thereby realizing multiple liquid injections or replenishments of the cell, and has a very good performance.

[0015] Meanwhile, after the connector is fixed to the cell cover, at least a portion of the connector protrudes outward relative to the cell cover. This allows the threaded connection portion to have a larger radial dimension in the through hole, and the thread length to be longer, which helps to improve the firmness of the threaded connection.

[0016] (2) Setting a reinforcing ring in the through hole facilitates the preparation and molding of the reinforcing seat. On the other hand, the reinforcing ring can enhance the structural strength of the threaded connection position and improve the overall structural strength of the connecting seat, thereby increasing the service life of the connecting seat.

[0017] (3) Setting the hardness of the reinforcing ring to be greater than that of the connecting seat can ensure the structural strength of the threaded connection and improve the reliability of the connection.

[0018] (4) The reinforcing ring is made of plastic. On the one hand, it is lightweight, which is conducive to the lightweight design of the product. On the other hand, the reinforcing ring is integrally molded on the second part, which makes the connection between the reinforcing ring and the connecting seat more secure and prevents rotation. The anti-rotation structure set between the reinforcing ring and the connecting seat can effectively prevent the reinforcing ring from rotating relative to the plug when the reinforcing ring and the connecting seat are separate structures, thus improving the performance. On the other hand, when the reinforcing ring and the connecting seat are integrally injection molded, the contact area between the reinforcing ring and the connecting seat can be increased, further enhancing the reliability of the connection between the two.

[0019] (5) The sealing element adopts a sealing ring, which has a simple structure, low cost, and good sealing effect; the sealing element adopts a sealing gasket, which can increase the sealing area and improve the sealing effect compared with the sealing ring.

[0020] (6) In addition to the sealing ring or sealing gasket, a rubber plug is also set in the injection hole, which can further improve the sealing effect of the injection hole.

[0021] (7) An operating part is provided at one end of the fastener, which is conducive to the screw installation and disassembly of the fastener on the connector, making the installation and disassembly easier and less strenuous.

[0022] (8) The recessed groove provided on the cell cover plate can provide an installation position for the connector and help ensure the positional accuracy of the connector on the cell cover plate. At the same time, compared with directly fixing the connector to the upper surface of the cell cover plate, it helps to reduce the overall size of the cell in the thickness direction of the cell cover plate.

[0023] (9) The first hole and the second hole are provided on the cell cover plate so that the connector is fixed in the second hole. When the connector is welded to the cell cover plate, the position of the first hole can provide more space for the solder, and prevent the solder from protruding on the upper surface of the cell cover plate, thereby improving the appearance of the cell.

[0024] This application also proposes a battery cell having a sealing structure as described above.

[0025] The battery cell described in this application, by adopting the above-mentioned sealing structure, can not only ensure the sealing effect at the injection hole, but also allow the injection hole to be unsealed by removing the fasteners, enabling multiple injections or replenishments of the battery cell, thereby improving the reusability and service life of the battery cell. Attached Figure Description

[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is an exploded view of the application state of the sealing structure described in the embodiments of this application; Figure 2 This is a perspective view of the application state of the sealing structure described in the embodiments of this application; Figure 3 This is a front view of the application state of the sealing structure described in the embodiments of this application; Figure 4 for Figure 3 Sectional view from the AA direction; Figure 5 This is a perspective view of the connector described in the embodiment of this application; Figure 6 This is a cross-sectional view of the connector described in the embodiment of this application; Figure 7 This is a schematic diagram of the reinforcing ring described in an embodiment of this application; Figure 8 This is a schematic diagram of the structure of the fastener described in the embodiments of this application; Figure 9 This is a schematic diagram of the first structure of the battery cell cover plate described in the embodiments of this application; Figure 10 This is a schematic diagram of a second structure of the battery cell cover plate described in an embodiment of this application; Figure 11 This is a schematic diagram of the sealing structure and the second type of battery cell cover plate in the embodiment of this application. Explanation of reference numerals in the attached figures: 1. Cell cover plate; 2. Connector; 3. Reinforcing ring; 4. Fasteners; 5. Seals; 11. Positive terminal; 12. Negative terminal; 13. Explosion-proof valve; 20. Through hole; 51. Sealing ring; 52. Rubber stopper; 101. Injection hole; 102. Settling tank; 103. First hole; 104. Second hole; 201. First through hole; 202. Second through hole; 2021. Anti-rotation groove; 301. Internal thread; 302. Anti-rotation protrusion; 401. External thread; 402. Operating part. Detailed Implementation

[0027] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0029] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0031] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0032] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0033] An embodiment of the first aspect of this application provides a sealing structure installed at the liquid injection hole of the cell cover plate, which can not only seal the liquid injection hole well, but also release the seal on the liquid injection hole, thereby facilitating multiple liquid injections and replenishments of the cell.

[0034] In related technologies, after the electrolyte injection, formation, and possible replenishment operations are completed, the injection hole of a lithium battery is typically sealed using rubber studs and welded aluminum sealing sheets to prevent electrolyte leakage and the intrusion of external impurities, thereby ensuring the battery's safety and performance. However, while this method effectively seals the injection hole, it is a one-time, non-removable, permanent seal. This means that once the battery has been initially injected and sealed, it cannot be opened again for replenishment or multiple injection operations, greatly limiting the battery's reusability and lifespan.

[0035] In view of this, in order to overcome the shortcomings of related technologies, the sealing structure of this embodiment combines... Figures 1 to 11 As shown, the overall design includes a connector 2, a fastener 4, and a seal 5.

[0036] The connecting seat 2 is fixedly connected to the cell cover plate 1, and the connecting seat 2 is provided with a through hole 20 connected to the liquid injection hole 101. At least a portion of the hole wall of the through hole 20 is provided with internal threads 301. The fastener 4 is provided with external threads 401, and the fastener 4 is screwed into the through hole 20 through the internal threads 301 and the external threads 401. The sealing element 5 is provided at least between the cell cover plate 1 and the fastener 4. When the fastener 4 is screwed into the through hole 20, the fastener 4 can press the sealing element 5, so that the sealing element 5 can form a seal against the liquid injection hole 101.

[0037] Thus, the connecting seat 2, fastener 4, and sealing element 5 are configured to fix the connecting seat 2 to the cell cover plate 1. A through hole 20 is provided on the connecting seat 2, which communicates with the liquid injection hole 101 on the cell cover plate 1. At least part of the hole wall of the through hole 20 is provided with internal thread 301. The fastener 4 is provided with external thread 401. The sealing element 5 is provided at least between the cell cover plate 1 and the fastener 4. In this way, the fastener 4 is screwed onto the connecting seat 2 through the cooperation of the internal thread 301 and the external thread 401, and the sealing element 5 seals the liquid injection hole 101.

[0038] This structural design not only provides a good seal at the injection hole 101, but also facilitates the removal of the fastener 4 by using the screw connection between the fastener 4 and the connecting seat 2, allowing the injection hole 101 to be unsealed and enabling multiple injections or replenishments of the battery cell. Furthermore, after the connecting seat 2 is fixed to the battery cell cover plate 1, at least a portion of the connecting seat 2 protrudes outward relative to the battery cell cover plate 1. This allows for a larger radial dimension of the threaded connection portion in the through hole 20, and also allows for a longer thread length, thus improving the robustness of the threaded connection.

[0039] Based on the above overview, for more details, please refer to... Figures 1 to 11As shown, the cell cover 1 typically has a terminal post, an explosion-proof valve 13, and a liquid injection port 101. The terminal post can be, for example, only a positive terminal post 11, or only a negative terminal post 12, or as... Figures 1 to 3 In this way, a positive terminal 11 and a negative terminal 12 are simultaneously provided on the cell cover plate 1.

[0040] In the aforementioned sealing structure, the connecting seat 2 is fixedly connected to the cell cover plate 1. In a preferred embodiment, the connecting seat 2 is made of the same aluminum material as the cell cover plate 1 and is fixedly connected to the cell cover plate 1 by welding. This ensures the connection strength of the connecting seat 2 and the sealing performance between the connecting seat 2 and the cell cover plate 1. It is understood that the connecting seat 2 can also be fixed to the cell cover plate 1 by bonding, screwing, or other methods to ensure the reliability of the connection between the connecting seat 2 and the cell cover plate 1, as well as the sealing performance between them. This ensures a tight seal inside the cell when the cell cover plate 1 is assembled into the cell housing to form the entire cell, preventing electrolyte leakage.

[0041] Because the material of connector 2 is relatively soft, it is not suitable for repeated disassembly. Therefore, in combination with Figures 1 to 7 As shown, in some exemplary embodiments, for example, a reinforcing ring 3 is provided in the through hole 20, such that the reinforcing ring 3 is arranged coaxially with the through hole 20, and the aforementioned internal thread 301 is specifically formed on the inner wall of the reinforcing ring 3. In this way, the reinforcing ring 3 facilitates the fabrication and forming of the reinforcing seat, and enhances the structural strength of the threaded connection position, thereby improving the overall structural strength of the connecting seat 2 and extending its service life.

[0042] In a specific implementation, the through hole 20 provided on the connecting seat 2 includes, for example, a first through hole 201 and a second through hole 202 connected along the injection direction. The diameter of the first through hole 201 is smaller than the diameter of the second through hole 202, and a connecting end face is formed between the first through hole 201 and the second through hole 202. The height of the reinforcing ring 3 is preferably the same as the height of the second through hole 202, and the reinforcing ring 3 is located in the second through hole 202. In this way, the connecting end face can play a certain limiting role in the axial direction of the reinforcing ring 3, so as to prevent the reinforcing ring 3 from coming out of the through hole 20.

[0043] During assembly, the reinforcing ring 3 is installed into the second through hole 202 from the side of the connecting seat 2, and then the connecting seat 2 is welded to the cell cover plate 1. The fastener 4 can be inserted from the side of the first through hole 201 of the connecting seat 2 and screwed into the reinforcing ring 3.

[0044] It should be noted that in the structure of the connecting seat 2, in addition to the above-mentioned through hole 20 using two connected holes of different diameters, it can also use a hole of the same diameter. In this case, for example, the hole wall of the through hole 20 can be designed to be thick enough to have sufficient structural strength. In this way, the fastener 4 can be directly screwed into the through hole 20 on the connecting seat 2, but it is not as reliable as the structure with the reinforcing ring 3.

[0045] In some exemplary embodiments, the hardness of the reinforcing ring 3 is greater than that of the connecting seat 2. This ensures the structural strength of the threaded connection and improves the reliability of the connection. In specific implementations, the material of the reinforcing ring 3 can be, for example, 304 stainless steel, hard plastic, etc.

[0046] In some exemplary embodiments, the reinforcing ring 3 is made of plastic, for example, and is integrally formed with the connecting seat 2. This structure, on the one hand, utilizes the lightweight nature of plastic, which is beneficial for lightweight product design; on the other hand, the integral forming of the reinforcing ring 3 on the second part makes the connection between the reinforcing ring 3 and the connecting seat 2 more secure and prevents rotation.

[0047] Combination Figure 5 and Figure 7 As shown, in some exemplary embodiments, an anti-rotation structure is provided between the reinforcing ring 3 and the connecting seat 2. This effectively prevents the reinforcing ring 3 from rotating relative to the connecting seat 2 when the reinforcing ring 3 and the connecting seat 2 are separate structures, thus improving the performance. Furthermore, when the reinforcing ring 3 and the connecting seat 2 are integrally injection molded, the contact area between them is increased, further enhancing the reliability of their connection.

[0048] Reference Figure 5 and Figure 7 As shown, specifically, the aforementioned anti-rotation structure includes, for example, an anti-rotation groove 2021 disposed on the wall of the second through hole 202, and an anti-rotation protrusion 302 disposed on the outer circumferential surface of the reinforcing ring 3. Both the anti-rotation groove 2021 and the anti-rotation protrusion 302 extend axially along the reinforcing ring 3, and the anti-rotation protrusion 302 can be engaged in the anti-rotation groove 2021. Preferably, the anti-rotation groove 2021 and the anti-rotation protrusion 302 are arranged in multiple sets at uniform intervals. This not only facilitates the fabrication of the anti-rotation structure but also effectively prevents the reinforcing ring 3 from rotating relative to the other side in the second through hole 202.

[0049] Combination Figure 1 , Figure 4 and Figure 11As shown, in some exemplary embodiments, the seal 5 includes, for example, a sealing ring 51 disposed on the fastener 4 or the cell cover 1, the inner diameter of which is larger than the diameter of the through hole 20. The seal 5 using the sealing ring 51 has a simple structure, low cost, and good sealing effect.

[0050] In addition to the sealing ring 51, in some exemplary embodiments, the sealing element 5 may also be a gasket disposed between the fastener 4 and the cell cover plate 1, which can block the through hole 20. In this case, the use of a gasket in the sealing element 5 can increase the sealing area and improve the sealing effect compared to the sealing ring 51.

[0051] In practice, the sealing ring 51 or the sealing gasket is pressed onto the cell cover plate 1 by the fastener 4, which can form a seal on the injection hole 101.

[0052] Based on the presence of a sealing ring 51 or a sealing gasket, continue to combine Figure 1 , Figure 4 and Figure 11 As shown, in some exemplary embodiments, the seal 5 further includes, for example, a rubber plug 52 that is interference-fitted into the injection hole 101. Thus, a secondary seal can be formed on the injection hole 101 using the sealing ring 51 or gasket and the rubber plug 52, thereby further improving the sealing effect of the injection hole 101.

[0053] In addition, combined Figure 1 , Figure 4 , Figure 8 and Figure 11 As shown, in some exemplary embodiments, for example, an operating part 402 is provided at the end of the fastener 4 away from the injection hole 101. The operating part 402 is used to operate the fastener 4 to be screwed into the through hole 20 in conjunction with an external tool. In this way, the operating part 402 facilitates the screwing installation and removal of the fastener 4 on the connecting seat 2, making installation and removal easier and less strenuous.

[0054] Specifically, the operating part 402 can be, for example, a cross-shaped groove formed on the end of the fastener 4, or an internal hexagonal groove or hexagonal prism formed on the end of the fastener 4. This allows the use of external tools such as screwdrivers, external hex wrenches or internal hex wrenches to facilitate the fastener 4 to be smoothly screwed onto or removed from the connecting seat 2, which also facilitates the screwing and unscrewing of the fastener 4 on the connecting seat 2.

[0055] Combination Figure 4 and Figure 9As shown, in some exemplary embodiments, the cell cover plate 1 is provided with a recess 102, which is connected to the injection hole 101, and the aforementioned connecting seat 2 is fixedly connected to the recess 102. In this case, the recess 102 provided on the cell cover plate 1 can provide an installation position for the connecting seat 2 and help ensure the positional accuracy of the connecting seat 2 on the cell cover plate 1. At the same time, compared with directly fixing the connecting seat 2 to the upper surface of the cell cover plate 1, it helps to reduce the overall size of the cell in the thickness direction of the cell cover plate 1.

[0056] Combination Figure 10 and Figure 11 As shown, in some exemplary embodiments, the cell cover plate 1 is provided with a first hole 103, a second hole 104, and an injection hole 101 sequentially along the injection direction. The diameter of the first hole 103 is larger than the diameter of the second hole 104, and the diameter of the second hole 104 is larger than the diameter of the injection hole 101. The connecting seat 2 is fixedly connected to the second hole 104. In this way, when the connecting seat 2 is welded to the cell cover plate 1, the position of the first hole 103 can provide more space for the solder joint, preventing the solder joint from protruding from the upper surface of the cell cover plate 1, thereby improving the appearance of the cell.

[0057] Specifically, a first stepped surface is formed between the first hole 103 and the second hole 104, and a second stepped surface is formed between the second hole 104 and the injection hole 101. The connecting seat 2 is located in the second hole 104 and is supported on the second stepped surface. The connecting seat 2 is welded to the first stepped surface, so that the solder mark is contained in the first hole 103, thereby preventing the solder mark from protruding outward on the upper surface of the cell cover plate 1 and improving the appearance of the cell.

[0058] It is worth noting that, regarding the sealing structure of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still composed of... Figures 1 to 11 As shown, it includes a connecting seat 2, a fastener 4, and a sealing element 5. The connecting seat 2 is welded to the cell cover plate 1, and the connecting seat 2 has a through hole 20 connected to the injection hole 101. A reinforcing ring 3 is provided in the through hole 20, and the reinforcing ring 3 is coaxially arranged with the through hole 20. An internal thread 301 is formed on the inner wall of the reinforcing ring 3. The fastener 4 has an external thread 401, and the fastener 4 is screwed into the reinforcing ring 3 through the internal thread 301 and the external thread 401. The sealing element 5 is provided at least between the cell cover plate 1 and the fastener 4. When the fastener 4 is screwed into the through hole 20, the fastener 4 can press the sealing element 5, so that the sealing element 5 can form a seal against the injection hole 101.

[0059] The hardness of the reinforcing ring 3 is greater than that of the connecting seat 2. The reinforcing ring 3 is preferably made of plastic, and it is integrally formed with the connecting seat 2. An anti-rotation structure is provided between the reinforcing ring 3 and the connecting seat 2.

[0060] The sealing element 5 includes a sealing ring 51 disposed on the fastener 4 or the cell cover plate 1, the inner diameter of the sealing ring 51 being larger than the diameter of the through hole 20. The sealing element 5 also includes a rubber plug 52 that is interference-fitted into the injection hole 101.

[0061] Among them, the end of the fastener 4 away from the injection hole 101 is provided with an operating part 402, which is used to cooperate with external tools to operate the fastener 4 to be screwed into the through hole 20.

[0062] The cell cover plate 1 has a recessed groove 102, which is connected to the injection hole 101. The connecting seat 2 is welded and fixed in the recessed groove 102. Alternatively, the cell cover plate 1 has a first hole 103, a second hole 104 and an injection hole 101 arranged sequentially along the injection direction. The diameter of the first hole 103 is larger than the diameter of the second hole 104, and the diameter of the second hole 104 is larger than the diameter of the injection hole 101. The connecting seat 2 is welded and fixed in the second hole 104.

[0063] In the above preferred embodiments, the specific settings and arrangements of the connecting seat 2, fastener 4, sealing element 5, and the structure of the liquid injection hole 101 on the cell cover 1 can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the connecting seat 2, fastener 4, sealing element 5, and the structure of the liquid injection hole 101 on the cell cover 1 can also be referred to the descriptions in the above exemplary embodiments.

[0064] The sealing structure of this embodiment adopts the above design. The fastener 4 is screwed into the through hole 20 on the connecting seat 2, so that the sealing element 5 is pressed between the fastener 4 and the cell cover plate 1. In this way, not only can the sealing effect at the injection hole 101 be guaranteed, but the injection hole 101 can also be unsealed by removing the fastener 4, so as to realize multiple injections or replenishment of the cell, and at the same time, it has a good performance.

[0065] An embodiment of the second aspect of this application provides a battery cell having a sealing structure as described above.

[0066] In this embodiment, the battery cell, by adopting the above-mentioned sealing structure, can not only ensure the sealing effect at the injection hole 101, but also release the seal of the injection hole 101 by disassembling the fastener 4, so as to realize multiple injections or replenishments of the battery cell, thereby improving the reusability and service life of the battery cell.

[0067] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A sealing structure, installed at the liquid injection hole of the battery cell cover plate, characterized in that: The sealing structure includes a connecting seat, as well as fasteners and seals; The connecting seat is fixed to the cell cover plate, and the connecting seat is provided with a through hole connected to the liquid injection hole, and at least a portion of the hole wall of the through hole is provided with internal threads; The fastener has an external thread, and the fastener is screwed into the through hole via the internal thread and the external thread; The sealing element is at least disposed between the cell cover plate and the fastener, and the sealing element is used to seal the injection hole.

2. The sealing structure according to claim 1, characterized in that: A reinforcing ring is provided in the through hole, and the reinforcing ring is arranged coaxially with the through hole; The internal thread is formed on the inner wall of the reinforcing ring.

3. The sealing structure according to claim 2, characterized in that: The hardness of the reinforcing ring is greater than that of the connecting seat.

4. The sealing structure according to claim 2, characterized in that: The reinforcing ring is made of plastic; The reinforcing ring is integrally formed with the connecting seat; and / or, an anti-rotation structure is provided between the reinforcing ring and the connecting seat.

5. The sealing structure according to claim 1, characterized in that: The sealing element includes a sealing ring disposed on the fastener or the cell cover plate, the inner diameter of the sealing ring being larger than the diameter of the through hole; or, the sealing element includes a sealing gasket disposed between the fastener and the cell cover plate, the sealing gasket being capable of sealing the through hole.

6. The sealing structure according to claim 5, characterized in that: The sealing element also includes a rubber plug that is interference-fitted into the injection hole.

7. The sealing structure according to claim 1, characterized in that: The fastener has an operating part at the end away from the injection hole, which is used to operate the fastener to be screwed into the through hole in conjunction with an external tool.

8. The sealing structure according to any one of claims 1 to 7, characterized in that: The cell cover plate is provided with a groove, which is connected to the liquid injection hole; The connecting seat is fixedly connected to the settling tank.

9. The sealing structure according to any one of claims 1 to 7, characterized in that: The cell cover plate is provided with a first hole, a second hole and the injection hole in sequence along the injection direction. The diameter of the first hole is larger than the diameter of the second hole, and the diameter of the second hole is larger than the diameter of the injection hole. The connector is fixedly connected to the second hole.

10. A battery cell, characterized in that: The battery cell is provided with a sealing structure as described in any one of claims 1 to 9.

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