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, and comprises a connecting seat, a plug cover and a sealing element. The connecting seat is provided with a first part and a second part connected with each other, the first part is fixed to the battery cell cover plate, the second part is provided with an external thread, and the connecting seat is provided with a through hole penetrating through the first part and the second part, the through hole is communicated with the liquid injection hole; the plug cover is provided with an internal thread, and the plug cover is screwed on the second part through the internal thread and the external thread; and the sealing element is arranged between the second part and the plug cover at least, and is used for sealing the second part and the plug cover. 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 plug cover, so that the battery cell can be injected with liquid or supplemented with liquid for multiple times.

Description

Technical Field

[0001] This application relates to the field of lithium battery technology, and in particular to a sealing structure. It 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, a plug and a sealing element; The connector has a first part and a second part connected together. The first part is fixed to the cell cover plate, the second part is provided with external threads, and the connector is provided with a through hole that penetrates the first part and the second part. The through hole is connected to the liquid injection hole. The plug has an internal thread, and the plug is screwed onto the second part through the internal thread and the external thread; The sealing element is at least disposed between the second part and the plug, for sealing the second part and the plug.

[0006] Furthermore, the second part includes a base connected to the first part, and a reinforcing ring fixed to the base; the top end of the reinforcing ring is coplanar with the top end of the second part, and the reinforcing ring is provided with the external thread.

[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 on the second part; and / or, an anti-rotation structure is provided between the reinforcing ring and the second part.

[0009] Furthermore, the sealing element includes a sealing ring disposed on the plug or the connecting seat, the inner diameter of the sealing ring being larger than the diameter of the through hole.

[0010] Furthermore, the sealing element includes a sealing gasket disposed between the plug and the connecting seat, the sealing gasket being capable of sealing the through hole.

[0011] Furthermore, the sealing gasket includes a sheet-shaped main body and a protrusion formed on one side of the main body, the protrusion being able to be interference-fitted 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, plug and sealing element, makes the first part of the connecting seat fixed to the cell cover plate, the second part is provided with external thread, and the through hole on the connecting seat is connected to the liquid injection hole on the cell cover plate, and the sealing element can seal between the second part and the plug. The plug is screwed onto the second part through the cooperation of internal thread and external thread. This structure can not only provide a good seal at the liquid injection hole, but also facilitate the disassembly of the plug by the screw connection between the plug and the connecting seat, so that the liquid injection hole can be unsealed, thereby realizing multiple liquid injection or replenishment of the cell, and has a good use effect.

[0015] At the same time, the second part protrudes outward relative to the cell cover plate, which allows the threaded connection part to be designed with a larger radial dimension in the through hole, and the thread length can be set to be longer, which helps to improve the firmness of the threaded connection.

[0016] (2) A reinforcing ring is set on the second part. On the one hand, it is convenient to prepare and form the connecting seat. On the other hand, the reinforcing ring can enhance the structural strength of the threaded connection position, and at the same time, it can improve the overall structural strength of the connecting seat and improve 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.

[0020] (6) The sealing element uses a sealing gasket, which can increase the sealing area and improve the sealing effect compared to a sealing ring.

[0021] (7) The sealing gasket includes a sheet-like main body and a protrusion formed on one side of the main body, such that the protrusion is interference-fitted in the through hole, which can further improve the sealing effect of the injection hole.

[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 release the seal at the injection hole by removing the plug, so as to realize 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 schematic diagram of the reinforcing ring described in an embodiment of this application; Figure 7 This is a schematic diagram of the plug structure described in an embodiment of this application; Figure 8 This is a schematic diagram of the first structure of the battery cell cover plate described in the embodiments of this application; Figure 9 This is a schematic diagram of a second structure of the battery cell cover plate described in an embodiment of this application; Figure 10 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. Seal; 5. Plug; 11. Positive terminal; 12. Negative terminal; 13. Explosion-proof valve; 101. Injection hole; 102. Settling tank; 103. First hole; 104. Second hole; 200. Through hole; 201. First part; 202. Second part; 20. Base; 2021. Anti-rotation groove; 301. External thread; 302. Anti-rotation protrusion; 501. Internal thread. 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 10 As shown, the overall design includes a connecting seat 2, a plug 5, and a seal 4.

[0036] The connecting seat 2 has a first part 201 and a second part 202 connected together. The first part 201 is fixed to the cell cover plate 1, and a seal is formed between the first part 201 and the cell cover plate 1. The second part 202 is provided with an external thread 301, and the connecting seat 2 is provided with a through hole 200 that passes through the first part 201 and the second part 202, and the through hole 200 is connected to the injection hole 101. The plug 5 is provided with an internal thread 501, and the plug 5 is screwed onto the second part 202 through the internal thread 501 and the external thread 301, that is, the plug 5 is screwed onto the connecting seat 2. The sealing element 4 is provided at least between the second part 202 and the plug 5. When the plug 5 is screwed into the through hole 200, the plug 5 can press the sealing element 4, so that the sealing element 4 can form a seal between the second part 202 and the plug 5, that is, the sealing element 4 can seal the injection hole 101.

[0037] Thus, through the connection seat 2, the plug 5, and the seal 4, the first part 201 of the connection seat 2 is fixedly connected to the cell cover plate 1, the second part 202 is provided with external thread 301, the plug 5 is provided with internal thread 501, and the through hole 200 on the connection seat 2 is connected to the liquid injection hole 101 on the cell cover plate 1. The seal 4 is installed at least between the top of the second part 202 and the plug 5. When the plug 5 is screwed onto the second part 202, that is, when the plug 5 is screwed and fixed onto the connection seat 2, the seal 4 is pressed between the second part 202 and the plug 5 to seal the liquid injection hole 101 and the gap between the second part 202 and the plug 5.

[0038] This structural design not only provides a good seal at the injection hole 101, but also facilitates the removal of the plug 5 by screwing it onto the connecting seat 2, allowing the injection hole 101 to be unsealed and enabling multiple injections or replenishments of the battery cell. Simultaneously, the second part 202 protrudes outward relative to the battery cell cover plate 1, allowing for a larger radial dimension of the threaded connection portion in the through hole 200, and also enabling a longer thread length, thereby improving the robustness of the threaded connection.

[0039] Based on the above overview, for more details, please refer to... Figures 1 to 10 As 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 above-mentioned sealing structure, the connecting seat 2 is fixedly connected to the cell cover plate 1. As 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 can ensure the connection strength of the connecting seat 2 and the sealing performance of the connection between the connecting seat 2 and the cell cover plate 1.

[0041] It is understood that the connector 2 can be fixed to the cell cover 1 by means of bonding, screwing, etc., so as to ensure the reliability of the connection between the connector 2 and the cell cover 1, as well as the sealing between them. In this way, when the cell cover 1 is assembled into the cell housing to form the whole cell, the sealing effect inside the cell can be guaranteed to prevent electrolyte leakage.

[0042] In this embodiment, the connecting seat 2 has a first part 201 and a second part 202 connected in structure. The first part 201 and the second part 202 are preferably cylindrical, and the outer diameter of the first part 201 is smaller than the outer diameter of the second part 202. Since the plug 5 is screwed onto the second part 202, the second part 202 can only be cylindrical, while the first part 201 can be other shapes such as a cuboid with a central opening. Furthermore, the outer contour of the first part 201 should match the contour of the groove 102 or the second hole 104 on the cell cover plate 1.

[0043] Because the material of connector 2 is relatively soft, it is not suitable for repeated disassembly. Therefore, in combination with Figures 1 to 6 As shown, in some exemplary embodiments, for example, the second part 202 includes a base 20 connected to the first part, and a reinforcing ring 3 fixed to the base 20. The top end of the reinforcing ring 3 is coplanar with the top end of the second part 202, and the reinforcing ring 3 is provided with the aforementioned external thread 301.

[0044] In specific implementation, for example, the base 20 and the first part 201 are made of the same material, and the base 20 and the first part 201 are integrally formed. The reinforcing ring 3 is sleeved on the base 20, and is fixed to the base 20 by, for example, injection molding the reinforcing ring 3, the base 20 and the first part 201 into one piece, as described below, and the external thread 301 is specifically formed on the outer peripheral surface of the reinforcing ring 3.

[0045] Here, a reinforcing ring 3 is provided on the second part 202, which can facilitate the preparation and molding of the connecting seat 2, and enhance the structural strength of the threaded connection position by using the reinforcing ring 3. This is beneficial for the reliable screwing of the plug 5 onto the second part 202, and also helps to improve the reliability of the seal. At the same time, it can also improve the overall structural strength of the connecting seat 2 and extend the service life of the connecting seat 2.

[0046] Additionally, it should be noted that the through hole 200 provided on the connector 2 can have the same diameter as the injection hole 101, or it can be slightly larger to facilitate the smooth injection of electrolyte. The through hole 200 can be a round hole or a tapered hole, and its specific design can be tailored to the actual application requirements.

[0047] 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 reinforcing ring 3 can be made of materials such as stainless steel or rigid plastic.

[0048] In some exemplary embodiments, the reinforcing ring 3 is made of plastic, and the reinforcing ring 3 is integrally formed with the connecting seat 2. This structural form, on the one hand, utilizes the lightweight nature of plastic material, which is beneficial for lightweight product design, and on the other hand, the integral forming of the reinforcing ring 3 on the second part 202 makes the connection between the reinforcing ring 3 and the connecting seat 2 more secure and prevents rotation.

[0049] Combination Figure 5 and Figure 6 As shown, in some exemplary embodiments, an anti-rotation structure is provided between the reinforcing ring 3 and the connecting seat 2. This anti-rotation structure 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, 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.

[0050] Specifically, refer to Figure 5 and Figure 6As shown, the aforementioned anti-rotation structure includes, for example, an anti-rotation slot provided on the outer peripheral surface of the second part 202, and an anti-rotation protrusion 302 provided on the outer peripheral surface of the reinforcing ring 3. Both the anti-rotation slot 2021 and the anti-rotation protrusion 302 extend circumferentially along the reinforcing ring 3, and the anti-rotation protrusion 302 can be engaged in the anti-rotation slot 2021. Preferably, the anti-rotation slot 2021 and the anti-rotation protrusion 302 are arranged in multiple sets at intervals.

[0051] This not only facilitates the fabrication of the anti-rotation structure, but also, when the reinforcing ring 3 and the connecting seat 2 are separate structures, the anti-rotation protrusion 302 and the anti-rotation groove 2021 effectively prevent the reinforcing ring 3 from rotating relative to the second part 202, thus effectively preventing the reinforcing ring 3 from rotating relative to the connecting seat 2 and improving the performance. Furthermore, when the reinforcing ring 3 and the connecting seat 2 are integrally injection molded, the cooperation between the anti-rotation protrusion 302 and the anti-rotation groove 2021 increases the contact area between the reinforcing ring 3 and the connecting seat 2, further enhancing the reliability of their connection.

[0052] Combination Figure 4 and Figure 10 As shown, in some exemplary embodiments, the seal 4 includes, for example, a sealing ring disposed on the plug 5 or the connecting seat 2, the inner diameter of which is larger than the diameter of the through hole 200. In this case, the seal 4 uses a sealing ring, which has a simple structure, low cost, and good sealing effect.

[0053] In addition to using a sealing ring, in some exemplary embodiments, the sealing element 4 can also be a sealing gasket disposed between the plug 5 and the connecting seat 2, which can seal the through hole 200. In this case, using a sealing gasket as the sealing element 4 can increase the sealing area and improve the sealing effect compared to a sealing ring. Furthermore, in specific implementations, the sealing ring or sealing gasket is pressed against the cell cover plate 1 by the plug 5, thus forming a seal on the injection hole 101.

[0054] Based on the use of a sealing gasket in the sealing element 4, as one feasible implementation, the sealing gasket includes, for example, a sheet-shaped main body and a protrusion formed on one side of the main body, the protrusion being able to be interference-fitted into the through hole 200. In this case, by utilizing the gap between the sealing plug 5 and the connecting seat 2 in the main body and the fit of the protrusion to seal the through hole 200, the sealing effect of the injection hole 101 can be further improved.

[0055] Combination Figure 4 and Figure 8As 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 9 and Figure 10 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 10 As shown, it includes a connecting seat 2, a plug 5, and a sealing element 4. The connecting seat 2 has a first part 201 and a second part 202 connected together. The first part 201 is welded to the cell cover plate 1. The second part is provided with an external thread 301. The connecting seat 2 is provided with a through hole 200 that passes through the first part 201 and the second part 202. The through hole 200 is connected to the liquid injection hole 101.

[0059] The plug 5 is provided with an internal thread 501, and the plug 5 is screwed onto the second part 202 through the internal thread 501 and the external thread 301. The sealing element 4 is provided at least between the second part 202 and the plug 5. When the plug 5 is screwed onto the second part 202, the plug 5 can press the sealing element 4, so that the sealing element 4 can seal the second part 202 and the plug 5, thereby forming a seal on the through hole 200 and the injection hole 101.

[0060] 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 on the second part 202, meaning the reinforcing ring 3 and the connecting seat 2 are integrally formed. An anti-rotation structure is provided between the reinforcing ring 3 and the second part 202.

[0061] The sealing element 4 includes a sealing ring disposed on the plug 5 or the connecting seat 2, wherein the inner diameter of the sealing ring is larger than the diameter of the through hole 200. Alternatively, the sealing element 4 includes a sealing gasket disposed between the plug 5 and the connecting seat 2.

[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, the plug 5, the sealing element 4, and the structure of the liquid injection hole 101 on the battery cell cover plate 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, the plug 5, the sealing element 4, and the structure of the liquid injection hole 101 on the battery cell cover plate 1 can also be referred to the descriptions in the above exemplary embodiments.

[0064] The sealing structure of this embodiment adopts the above design. By screwing the plug 5 to the second part 202 on the connecting seat 2, the sealing element 4 is pressed between the plug 5 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 plug 5, 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, not only can the sealing effect at the injection hole 101 be guaranteed, but also the injection hole 101 can be unsealed by removing the plug 5, 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, a plug, and a seal; The connector has a first part and a second part connected together. The first part is fixed to the cell cover plate, the second part is provided with external threads, and the connector is provided with a through hole that penetrates the first part and the second part. The through hole is connected to the liquid injection hole. The plug has an internal thread, and the plug is screwed onto the second part through the internal thread and the external thread; The sealing element is at least disposed between the second part and the plug, for sealing the second part and the plug.

2. The sealing structure according to claim 1, characterized in that: The second part includes a base connected to the first part, and a reinforcing ring fixed to the base; The top end of the reinforcing ring is coplanar with the top end of the second part, and the reinforcing ring is provided with the external thread.

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 on the second part; and / or, an anti-rotation structure is provided between the reinforcing ring and the second part.

5. The sealing structure according to claim 1, characterized in that: The sealing element includes a sealing ring disposed on the plug or the connecting seat, wherein the inner diameter of the sealing ring is larger than the diameter of the through hole.

6. The sealing structure according to claim 1, characterized in that: The sealing element includes a sealing gasket disposed between the plug and the connecting seat, the sealing gasket being capable of sealing the through hole.

7. The sealing structure according to claim 6, characterized in that: The sealing gasket includes a sheet-shaped main body and a protrusion formed on one side of the main body, the protrusion being able to be interference-fitted into the through hole.

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.

Images