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 is arranged at a liquid injection hole of a battery cell cover plate, and comprises a connecting seat fixed to the inner side of the battery cell cover plate, a sealing cover and a sealing piece; the liquid injection hole is provided with a first hole and a second hole in communication, the connecting seat is provided with a through hole in communication with the second hole; the sealing cover can form sealing and blocking of the through hole, the sealing cover and the first hole are provided with a matching structure, the matching structure can enable the sealing cover to pass through the first hole from the outer side of the battery cell cover plate, and when the sealing cover is rotated by a preset angle relative to the battery cell cover plate, the sealing cover can be clamped in the second hole; the sealing piece is arranged between the connecting seat and the battery cell cover plate, and can be pressed by the sealing cover to form sealing of the through hole. The sealing structure provided by the application can guarantee the sealing effect of the liquid injection channel by pressing the sealing piece by the sealing cover, and the sealing of the liquid injection channel can be released by detaching the sealing 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. 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 a battery cell cover plate. The sealing structure includes a connecting seat fixed to the inner side of the battery cell cover plate, a sealing cover, and a sealing element. The injection hole has a first hole and a second hole that are connected along the injection direction, and the connecting seat is provided with a through hole that communicates with the second hole; The sealing cap can form a blockage on the through hole, and a fitting structure is provided between the sealing cap and the first hole. The fitting structure allows the sealing cap to pass through the first hole from the outside of the cell cover plate, and when the sealing cap rotates at a preset angle relative to the cell cover plate, the sealing cap can be locked in the second hole. The sealing element is at least disposed between the connector and the cell cover plate, and the sealing element can be pressed by the sealing cover to form a seal on the through hole.

[0006] Furthermore, it also includes an anti-twist member disposed between the sealing cap and the sealing member; the anti-twist member can pass through the first hole and press against the sealing member, and when the sealing cap rotates relative to the cell cover plate, the anti-twist member can prevent the sealing member from twisting and deforming.

[0007] Furthermore, an anti-rotation structure is provided between the anti-torsion member and the connecting seat, the anti-rotation structure being used to restrict the anti-torsion member from rotating relative to the connecting seat.

[0008] Furthermore, the anti-rotation structure includes anti-rotation protrusions on the anti-torsion member and anti-rotation grooves on the connecting seat; a plurality of anti-rotation protrusions are arranged at intervals along the circumference of the through hole, the number of anti-rotation grooves matches the number of anti-rotation protrusions, and each anti-rotation protrusion is correspondingly inserted into the anti-rotation groove.

[0009] Furthermore, a positioning structure is provided between the anti-torsion component and the sealing cover, the positioning structure being used to position the installation position of the sealing cover.

[0010] Furthermore, the positioning structure includes a positioning protrusion on the sealing cover and a positioning groove on the anti-torsion member, wherein the positioning protrusion is located in the positioning groove.

[0011] Furthermore, the sealing cover is provided with an operating part, which is used to cooperate with an external operating component to operate the sealing cover to rotate relative to the cell cover plate.

[0012] Furthermore, the inner side of the battery cell cover is provided with a mounting groove; the connecting seat has a main body portion covering the injection hole and a connecting flange provided in the circumferential direction of the main body portion, the connecting flange being located in the mounting groove, and the connecting seat being welded to the mounting groove through the connecting flange.

[0013] Furthermore, the mating structure includes a plurality of notches spaced apart on the wall of the first hole, a limiting edge formed between two adjacent notches, and a plurality of protrusions on the sealing cover corresponding to each of the notches; each of the protrusions can pass through the corresponding notch, and when the sealing cover rotates at a preset angle, each of the protrusions is blocked at the corresponding limiting edge.

[0014] Compared with related technologies, this application has the following advantages: (1) The sealing structure described in this application, through the provided connecting seat, sealing cover and sealing element, makes the connecting seat fixed to the inner side of the cell cover plate and provides a through hole that communicates with the second hole of the liquid injection hole. The sealing cover and the first hole of the liquid injection hole are provided with a mating structure. By using the mating structure, the sealing cover can pass through the first hole from the outside of the cell cover plate. When the sealing cover rotates at a preset angle relative to the cell cover plate, the sealing cover can be locked in the second hole and form a blockage of the through hole. The sealing element can be pressed by the sealing cover and form a seal on the through hole, that is, a seal on the liquid injection hole.

[0015] Furthermore, the sealing cap can be removed from the first hole, releasing the seal and obstruction on the through hole and the injection hole, thus creating a connected injection channel between the injection hole and the through hole. This facilitates multiple injections or replenishments of the battery cell. Simultaneously, fixing the connector to the inside of the battery cell cover plate also contributes to the flatness design of the injection hole area on the battery cell cover plate.

[0016] (2) The anti-twist component installed between the sealing cap and the sealing element can, on the one hand, effectively press the sealing element tightly, and on the other hand, when the sealing cap rotates relative to the connecting seat during the assembly process, the anti-twist component can effectively prevent the sealing element from twisting and deforming, thereby further improving the reliability of the sealing of the through hole and the injection hole.

[0017] (3) An anti-rotation structure is set between the anti-torsion component and the connecting seat, which can effectively prevent the anti-torsion component from rotating relative to the connecting seat, that is, prevent the anti-torsion component from rotating relative to the battery cell cover. Thus, when the sealing cover rotates, the twisting and deformation of the sealing component can be effectively avoided due to the rotation of the sealing cover causing the anti-torsion component to rotate.

[0018] (4) The anti-rotation structure adopts the combination of anti-rotation protrusion and anti-rotation groove. Its structure is easy to mold and prepare, and can effectively prevent the relative rotation of the anti-torsion parts.

[0019] (5) The positioning structure helps the sealing cover to be accurately installed with the anti-twist component after the sealing cover passes through the first hole, thereby ensuring the installation position of the sealing cover and preventing the sealing cover from being misaligned and affecting the sealing effect of the through hole and the injection hole.

[0020] (6) The positioning structure adopts the insertion fit of positioning protrusion and positioning groove. Its structure is easy to mold and prepare, and can better ensure the installation position of the sealing cover.

[0021] (7) An operating part is provided on the sealing cover, which is conducive to the rotation of the sealing cover relative to the cell cover plate, making the installation and removal of the sealing cover easier and less strenuous.

[0022] (8) The mounting groove provided on the cell cover plate can provide a more precise installation position for the connector to be installed on the cell cover plate. The connector is connected to the mounting groove by welding the connecting flange, which also helps to ensure the reliability of the connector connection on the cell cover plate.

[0023] (9) The structure is provided with multiple notches and multiple limiting edges arranged at intervals on the first hole wall, and multiple protrusions on the sealing cover, so that each protrusion can pass through the corresponding notch, and when the sealing cover is rotated at a preset angle, each protrusion can be blocked at the corresponding limiting edge, thereby fixing the sealing cover axially in the second hole of the battery cell cover plate, preventing it from coming out of the first hole, thus ensuring the reliability of the mechanical locking of the sealing cover. Moreover, by rotating the sealing cover in the opposite direction at a preset angle, the sealing cover can be unlocked and removed, which facilitates the installation and removal of the sealing cover.

[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 use the sealing cover to press the sealing element to ensure the sealing effect of the liquid injection channel, but also release the seal of the liquid injection hole and the through hole by removing the sealing cover, so as to expose the liquid injection channel, which facilitates the multiple liquid injection or replenishment 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 structural diagram showing the connection seat and seal in the form of mating with the battery cell cover plate, as described in the embodiments of this application. Figure 6 This is a diagram showing the installation structure of the anti-torsion component described in an embodiment of this application; Figure 7 This is a diagram showing the installation structure of the sealing cap as described in an embodiment of this application; Figure 8This is a schematic diagram of the connector structure described in the embodiment of this application; Figure 9 This is a schematic diagram of the anti-torsion component described in the embodiments of this application; Figure 10 This is a schematic diagram of the sealing cap structure described in an embodiment of this application; Figure 11 This is a schematic diagram of the injection hole from a first-view perspective, as described in an embodiment of this application. Figure 12 This is a partial structural diagram of the battery cell cover plate described in an embodiment of this application. Figure 13 This is another structural schematic diagram of the mating state of the sealing cap and the anti-torsion component described in the embodiments of this application; Explanation of reference numerals in the attached figures: 1. Cell cover plate; 2. Connector; 3. Sealing cover; 4. Anti-torsion component; 5. Sealing component; 11. Positive terminal; 12. Negative terminal; 13. Explosion-proof valve; 100. Mounting groove; 101. Injection hole; 1011. First hole; 1012. Second hole; 200. Through hole; 201. Main body; 202. Connecting flange; 2011. Anti-rotation groove; 10111. Notch; 10112. Limiting edge; 301. Protrusion; 302. Positioning protrusion; 303. Operating part; 401. Positioning groove; 402. Anti-rotation protrusion. 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 channel well, but also release the seal on the liquid injection channel, 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 13 As shown, the overall structure includes a connecting seat 2 fixed to the inside of the cell cover plate 1, a sealing cover 3, and a sealing element 5.

[0036] The injection hole 101 has a first hole 1011 and a second hole 1012 connected along the injection direction. The connecting seat 2 has a through hole 200 communicating with the second hole 1012. The sealing cap 3 can block the through hole 200, and a fitting structure is provided between the sealing cap 3 and the first hole 1011. The fitting structure allows the sealing cap 3 to pass through the first hole 1011 from the outside of the cell cover plate 1, and when the sealing cap 3 rotates at a preset angle relative to the cell cover plate 1, the sealing cap 3 can be locked in the second hole 1012. The sealing element 5 is provided at least between the connecting seat 2 and the cell cover plate 1, and the sealing element 5 can be pressed by the sealing cap 3 to form a seal on the through hole 200.

[0037] At this time, the connecting seat 2, sealing cover 3 and sealing element 5 are provided to fix the connecting seat 2 to the inner side of the cell cover plate 1. The connecting seat 2 is provided with a through hole 200 that communicates with the second hole 1012 of the injection hole 101. The sealing cover 3 and the first hole 1011 of the injection hole 101 are provided with a mating structure. With the mating structure, the sealing cover 3 can pass through the first hole 1011 from the outside of the cell cover plate 1. When the sealing cover 3 rotates at a preset angle relative to the cell cover plate 1, the sealing cover 3 can be locked in the second hole 1012. The sealing cover 3 forms a blockage of the through hole 200. The sealing element 5 can be pressed by the sealing cover 3 and form a seal on the through hole 200, that is, a seal on the injection hole 101.

[0038] Furthermore, the sealing cap 3 can be removed from the first hole 1011, releasing the seal and obstruction on the through hole 200 and the injection hole 101, thus forming a connected injection channel between the injection hole 101 and the through hole 200. This facilitates multiple injections or replenishments of the battery cell. Simultaneously, fixing the connecting seat 2 to the inside of the battery cell cover plate 1 also contributes to the flatness design of the injection hole 101 on the battery cell cover plate 1.

[0039] Based on the above overview, specifically, the cell cover plate 1 typically includes 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 As shown, 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 inner side of the cell cover plate 1, that is, the side of the cell cover plate 1 facing the inside of the cell housing is fixedly connected to the connecting seat 2. In a preferred embodiment, the material of the connecting seat 2 is the same as that of the cell cover plate 1, for example, both are made of aluminum or aluminum alloy. Furthermore, the connecting seat 2 is preferably fixed to the cell cover plate 1 by welding, which ensures 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. Specifically, the connecting seat 2 can be directly welded to the inner side of the cell cover plate 1, or it can be welded to the mounting groove 100 on the cell cover plate 1 using the method described below.

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

[0042] Reference Figures 1 to 3 and combined Figure 10 and Figure 11 As shown, in some exemplary embodiments, the aforementioned mating structure includes, for example, a plurality of notches 10111 spaced apart on the wall of the first hole 1011, a limiting edge 10112 formed between two adjacent notches 10111, and a plurality of protrusions 301 provided on the sealing cover 3. Each protrusion 301 corresponds one-to-one with a notch 10111, and each protrusion 301 can pass through its corresponding notch 10111. When the sealing cover 3 rotates at a preset angle, each protrusion 301 is blocked at its corresponding limiting edge 10112.

[0043] Therefore, by utilizing the combination of multiple notches 10111, multiple limiting edges 10112, and multiple protrusions 301, the sealing cover 3 can be circumferentially fixed in the second hole 1012 of the cell cover plate 1, preventing the sealing cover 3 from falling out of the first hole 1011 and ensuring the reliability of the mechanical locking of the sealing cover 3. Moreover, by rotating the sealing cover 3 in the opposite direction by a preset angle, the sealing cover 3 can be unlocked and removed, thereby facilitating the installation and removal of the sealing cover 3.

[0044] In terms of specific structure, such as Figure 10 and Figure 11As shown, preferably, the circumferential edge of the first hole 1011 has four evenly distributed notches 10111 and four limiting edges 10112, which are arranged alternately. The sealing cover 3 has a flat plate structure and is provided with a plurality of protrusions 301 corresponding one-to-one with each notch 10111, that is, four protrusions 301 are provided, each of which can pass through the corresponding notch 10111. When the sealing cover 3 is rotated by a preset angle, that is, each protrusion 301 is offset from the corresponding notch 10111 and is respectively positioned opposite to the corresponding limiting edge 10112, at which time the sealing cover 3 presses against the sealing member 5, and the sealing cover 3 can be blocked at the limiting edge 10112, so that the sealing cover 3 is mechanically locked in the second hole 1012, that is, the sealing cover 3 is mechanically locked on the cell cover plate 1.

[0045] It is understood here that, in addition to the above-mentioned four notches 10111 and four limiting edges 10112, the number of notches 10111 and limiting edges 10112 can also be two, three, five or other multiples. This embodiment does not limit this, as long as the number of protrusions 301 on the sealing cover 3 matches the number of notches 10111.

[0046] Reference Figures 4 to 8 and combined Figure 12 As shown, as an exemplary structure, the inner side of the cell cover plate 1 is provided with a mounting groove 100. The connecting seat 2, in its longitudinal section, is approximately inverted "U"-shaped and has a main body 201 covering the injection hole 101, and a connecting flange 202 formed on the circumferential edge of the main body 201. The connecting flange 202 is located in the mounting groove 100, and the connecting seat 2 is welded to the mounting groove 100 on the cell cover plate 1 via the connecting flange 202. The aforementioned through hole 200 is specifically provided on the main body 201 and is preferably coaxially arranged with the injection hole 101.

[0047] At this time, the mounting groove 100 provided on the cell cover plate 1 can provide a more precise installation position for the connector 2 to be installed on the cell cover plate 1. Furthermore, the connector 2 is welded to the mounting groove 100 through the connecting flange 202, which also helps to ensure the reliability of the connection of the connector 2 to the cell cover plate 1.

[0048] In this embodiment, an installation space is formed between the main body 201 of the connector 2 and the inner side of the cell cover 1. The seal 5 is specifically located in this installation space and is interference-fitted between the connector 2 and the cell cover 1. As an exemplary structure, the seal 5 is preferably a sealing ring, with the outer portion of the seal 5 disposed between the connector 2 and the cell cover 1, and the inner portion disposed between the connector 2 and the sealing cover 3. The seal 5 can be pressed tightly by the sealing cover 3.

[0049] In practice, the seal 5 can be pre-fixed to the connector 2 by means of adhesive or snap-fit, or pre-fixed to the inside of the cell cover 1. Then the connector 2 is assembled into the mounting groove 100 on the cell cover 1, and then the connector 2 is welded to the cell cover 1.

[0050] It is worth noting that, in addition to the sealing ring, the sealing element 5 may also include a sealing plug that is interference-fitted into the through hole 200. In this case, the sealing ring and the sealing plug may adopt a separate structure. By utilizing the dual sealing effect of the sealing ring and the sealing plug, the sealing performance of the injection channel can be better guaranteed.

[0051] Reference Figure 1 , Figure 2 as well as Figures 4 to 7 and combined Figure 8 As shown, in some exemplary embodiments, the sealing structure further includes an anti-twist member 4 disposed between the sealing cover 3 and the sealing member 5. The anti-twist member 4 can pass through the first hole 1011 and press against the sealing member 5. And when the sealing cover 3 rotates relative to the cell cover 1, the anti-twist member 4 can prevent the sealing member 5 from twisting and deforming.

[0052] At this time, the anti-twist component 4 set between the sealing cover 3 and the sealing element 5 can, on the one hand, effectively press the sealing element 5 tightly, and on the other hand, when the sealing cover 3 rotates relative to the battery cell cover plate 1 during the assembly process, the anti-twist component 4 can effectively prevent the sealing element 5 from twisting and deforming, further improving the reliability of the liquid injection hole 101 and the sealing of the liquid injection hole 101, that is, further improving the reliability of the liquid injection channel sealing.

[0053] In terms of specific structure, combined Figures 4 to 7 ,as well as Figure 9 As shown, the anti-twist component 4 is also, for example, flat and is located between the sealing cap 3 and the sealing component 5. In this case, the outer portion of the sealing component 5 is sandwiched between the connecting seat 2 and the cell cover plate 1, while the inner portion is specifically sandwiched between the connecting seat 2 and the anti-twist component 4. Thus, after the sealing cap 3 is installed, the force applied by the sealing cap 3 to the anti-twist component 4 presses the sealing component 5 tightly against the connecting seat 2. In this way, the anti-twist component 4 not only presses the sealing component 5 tightly, but also effectively prevents the sealing component 5 from twisting or deforming when the sealing cap 3 rotates relative to the cell cover plate 1, thereby further improving the sealing reliability of the injection channel.

[0054] In specific implementation, on the longitudinal section of the injection hole 101, the pressing dimension L1 between the battery cell cover plate 1 and the sealing element 5 should be no less than 0.5mm, and the pressing dimension L2 between the anti-torsion element 4 and the sealing element 5 should be no less than 0.7mm. This setting can better fix the sealing element 5 and improve the sealing reliability at the through hole 200.

[0055] Combination Figures 4 to 9 As shown, in some exemplary embodiments, for example, an anti-rotation structure is provided between the anti-torsion member 4 and the connecting seat 2. This anti-rotation structure is used to restrict the anti-torsion member 4 from rotating relative to the connecting seat 2. In this case, by using the provided anti-rotation structure, the anti-torsion member 4 can be effectively prevented from rotating relative to the cell cover 1. Thus, when the sealing cover 3 rotates, the twisting and deformation of the sealing member 5 caused by the rotation of the sealing cover 3 driving the anti-torsion member 4 to rotate can be effectively avoided.

[0056] For details, please refer to the following: Figures 4 to 9 As shown, the anti-rotation structure includes, for example, an anti-rotation protrusion 402 disposed on the side of the anti-torsion member 4 near the connecting seat 2, and an anti-rotation groove disposed on the connecting seat 2. Multiple anti-rotation protrusions 402 are arranged at intervals along the circumference of the through hole 200. The number of anti-rotation grooves 2011 matches the number of anti-rotation protrusions 402, and each anti-rotation protrusion 402 is correspondingly inserted into the anti-rotation groove 2011. In this case, the anti-rotation structure utilizes the cooperation between the anti-rotation protrusions 402 and the anti-rotation grooves 2011, making its structure easy to manufacture and effectively preventing relative rotation of the anti-torsion member 4.

[0057] In this embodiment, preferably, two anti-rotation protrusions 402 are arranged at intervals, and two corresponding anti-rotation grooves 2011 are also arranged. In this way, after the anti-torsion member 4 passes through the first hole 1011, each anti-rotation protrusion 402 can be inserted into the corresponding anti-rotation groove 2011 to realize the relative rotation of the anti-torsion member 4, and also to make the force on the anti-torsion member 4 more balanced.

[0058] It is worth noting that, besides providing an anti-rotation protrusion 402 on the anti-torsion component 4 and an anti-rotation groove 2011 on the connecting seat 2, the anti-rotation protrusion 402 can also be provided on the connecting seat 2, and the anti-rotation groove on the anti-torsion component 4; this arrangement is also acceptable. Furthermore, the number of anti-rotation protrusions 402 and anti-rotation grooves 2011 can be either two each, or three or four each, etc. Of course, it is understandable that there can also be only one anti-rotation protrusion 402 and one anti-rotation groove 2011. In this case, the cross-section of the anti-rotation protrusion 402 can be set to a regular shape such as a triangle, rectangle, pentagon, or hexagon, or other irregular shapes. Correspondingly, the cross-sectional shape of the anti-rotation groove 2011 must match the cross-sectional shape of the anti-rotation protrusion 402; this arrangement is also acceptable.

[0059] In some exemplary embodiments, a positioning structure is provided between the anti-twist member 4 and the sealing cap 3. This positioning structure is used to position the sealing cap 3 in place. The positioning structure helps the sealing cap 3 to be accurately installed with the anti-twist member 4 after it passes through the first hole 1011, thereby better ensuring the installation position of the sealing cap 3 and preventing misalignment that could affect the sealing effect of the injection channel.

[0060] In terms of specific structure, refer to Figure 13 As shown, the positioning structure includes, for example, a positioning groove 401 provided on the anti-torsion member 4 and a positioning protrusion 302 provided on the sealing cover 3. When the sealing cover 3 is installed, the positioning protrusion 302 can be inserted into the positioning groove 401. At this time, the installation position of the second cover plate can be well guaranteed by the cooperation of the positioning protrusion 302 and the positioning groove 401.

[0061] It is worth mentioning that, in addition to setting the positioning groove 401 on the anti-torsion component 4 and the positioning protrusion 302 on the sealing cover 3, the positioning groove 401 can also be set on the sealing cover 3 and the positioning protrusion 302 can be set on the anti-torsion component 4. Such a setting is also feasible.

[0062] In addition, combined Figure 3 , Figure 4 , Figure 7 and Figure 10 As shown, in some exemplary embodiments, for example, an operating part 303 is provided on the sealing cover 3. The operating part 303 is used to cooperate with an external operating component to operate the sealing cover 3 to rotate relative to the cell cover plate 1. The provision of the operating part 303 facilitates the operation of the rotation of the sealing cover 3 relative to the cell cover plate 1, making the installation and removal of the sealing cover 3 easier and less strenuous.

[0063] Specifically, the operating part 303 can be, for example, a cross-shaped groove formed on the upper surface of the sealing cover 3, or an internal hexagonal groove or hexagonal prism formed on the upper surface of the sealing cover 3. This allows the use of external tools such as screwdrivers, external hex wrenches or internal hex wrenches to facilitate the smooth rotation of the sealing cover 3, thereby facilitating the installation and removal of the sealing cover 3.

[0064] 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 13 As shown, it includes a connecting seat 2 fixed to the inner side of the cell cover plate 1, as well as a sealing cover 3, an anti-twist component 4, and a sealing component 5. The liquid injection hole 101 on the cell cover plate 1 has a first hole 1011 and a second hole 1012 that are connected along the liquid injection direction, and the connecting seat 2 is provided with a through hole 200 that communicates with the second hole 1012.

[0065] The sealing cap 3 can block the through hole 200, and a mating structure is provided between the sealing cap 3 and the first hole 1011. The mating structure allows the sealing cap 3 to pass through the first hole 1011 from the outside of the cell cover plate 1, and when the sealing cap 3 rotates at a preset angle relative to the cell cover plate 1, the sealing cap 3 can be locked in the second hole 1012. The sealing element 5 is at least provided between the connecting seat 2 and the cell cover plate 1, and the sealing element 5 can be pressed by the anti-twist element 4 to form a seal against the through hole 200. The anti-twist element 4 is provided between the sealing cap 3 and the sealing element 5, and the anti-twist element 4 can pass through the first hole 1011. When the sealing cap 3 rotates relative to the cell cover plate 1, the anti-twist element 4 can prevent the sealing element 5 from twisting and deforming.

[0066] The mating structure includes a plurality of notches 10111 spaced apart on the wall of the first hole 1011, a limiting edge 10112 formed between two adjacent notches 10111, and a plurality of protrusions 301 on the sealing cover 3 corresponding to each notch 10111. Each protrusion 301 can pass through the corresponding notch 10111, and when the sealing cover 3 rotates at a preset angle, each protrusion 301 is blocked at the corresponding limiting edge 10112.

[0067] The anti-torsion component 4 is provided with an anti-rotation structure between itself and the connecting seat 2. The anti-rotation structure is used to restrict the rotation of the anti-torsion component 4 relative to the connecting seat 2. In addition, a positioning structure is provided between the anti-torsion component 4 and the sealing cover 3. The positioning structure is used to position the sealing cover 3 in its installation position.

[0068] The sealing cap 3 is provided with an operating part 303, which is used to cooperate with an external operating component to operate the sealing cap 3 to rotate relative to the cell cover plate 1. Furthermore, a mounting groove 100 is provided on the inner side of the cell cover plate 1. The connecting seat 2 has a main body 201 covering the injection hole 101 and a connecting flange 202 provided in the circumferential direction of the main body 201. The connecting flange 202 is located in the mounting groove 100, and the connecting seat 2 is welded to the mounting groove 100 through the connecting flange 202.

[0069] In the above preferred embodiments, the specific settings and arrangements of the connecting seat 2, sealing cover 3, anti-torsion component 4 and sealing component 5, as well as the anti-rotation structure, positioning structure and the liquid injection hole 101 on the battery 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, sealing cover 3, anti-torsion component 4 and sealing component 5, as well as the anti-rotation structure, positioning structure and the liquid injection hole 101 on the battery cell cover 1, can also be referred to the descriptions in the above exemplary embodiments.

[0070] The sealing structure of this embodiment adopts the above design. With the help of the set mating structure, the sealing cover 3 can pass through the first hole 1011 from the outside of the battery cell cover plate 1. When the sealing cover 3 rotates at a preset angle relative to the battery cell cover plate 1, the sealing cover 3 can be locked in the second hole 1012 and form a blockage of the through hole 200. The sealing member 5 can be pressed by the sealing cover 3 and form a seal on the through hole 200, that is, a seal on the injection hole 101.

[0071] Furthermore, the sealing cap 3 can be removed from the first hole 1011, releasing the seal and obstruction on the through hole 200 and the injection hole 101, thus forming a connected injection channel between the injection hole 101 and the through hole 200. This facilitates multiple injections or replenishments of the battery cell. At the same time, fixing the connecting seat 2 to the inside of the battery cell cover plate 1 also contributes to the flatness design of the injection hole 101 on the battery cell cover plate 1.

[0072] An embodiment of the second aspect of this application provides a battery cell having a sealing structure as described above.

[0073] In this embodiment, the battery cell, by adopting the above-mentioned sealing structure, can not only use the sealing cover 3 to press the sealing element 5 to ensure the sealing effect of the liquid injection channel, but also, by removing the sealing cover 3, the sealing of the liquid injection hole 101 and the through hole 200 can be released, exposing the liquid injection channel, which facilitates multiple liquid injections or replenishments of the battery cell, thereby improving the reusability and service life of the battery cell.

[0074] 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 fixed to the inner side of the cell cover plate, as well as a sealing cover and a sealing element; The injection hole has a first hole and a second hole that are connected along the injection direction, and the connecting seat is provided with a through hole that communicates with the second hole; The sealing cap can form a blockage on the through hole, and a fitting structure is provided between the sealing cap and the first hole. The fitting structure allows the sealing cap to pass through the first hole from the outside of the cell cover plate, and when the sealing cap rotates at a preset angle relative to the cell cover plate, the sealing cap can be locked in the second hole. The sealing element is at least disposed between the connector and the cell cover plate, and the sealing element can be pressed by the sealing cover to form a seal on the through hole.

2. The sealing structure according to claim 1, characterized in that: It also includes an anti-twist component disposed between the sealing cap and the sealing element; The anti-torsion member can pass through the first hole and press the seal, and when the sealing cover rotates relative to the cell cover, the anti-torsion member can prevent the seal from twisting and deforming.

3. The sealing structure according to claim 2, characterized in that: An anti-rotation structure is provided between the anti-torsion member and the connecting seat, and the anti-rotation structure is used to restrict the anti-torsion member from rotating relative to the connecting seat.

4. The sealing structure according to claim 3, characterized in that: The anti-rotation structure includes an anti-rotation protrusion on the anti-torsion member and an anti-rotation groove on the connecting seat; The anti-rotation protrusions are arranged at intervals along the circumference of the through hole, and the number of anti-rotation grooves matches the number of anti-rotation protrusions, with each anti-rotation protrusion correspondingly inserted into the anti-rotation groove.

5. The sealing structure according to claim 2, characterized in that: A positioning structure is provided between the anti-torsion component and the sealing cover, and the positioning structure is used to position the installation position of the sealing cover.

6. The sealing structure according to claim 5, characterized in that: The positioning structure includes a positioning protrusion on the sealing cover and a positioning groove on the anti-torsion member, wherein the positioning protrusion is located in the positioning groove.

7. The sealing structure according to claim 1, characterized in that: The sealing cover is provided with an operating part, which is used to cooperate with an external operating component to operate the sealing cover to rotate relative to the cell cover plate.

8. The sealing structure according to claim 1, characterized in that: The inner side of the battery cell cover is provided with a mounting groove; The connector has a main body portion covering the injection hole and a connecting flange disposed on the circumference of the main body portion. The connecting flange is located in the mounting groove, and the connector is welded to the mounting groove through the connecting flange.

9. The sealing structure according to any one of claims 1 to 8, characterized in that: The mating structure includes a plurality of notches spaced apart on the wall of the first hole, a limiting edge formed between two adjacent notches, and a plurality of protrusions on the sealing cover corresponding to each of the notches. Each of the protrusions can pass through the corresponding notch, and when the sealing cover rotates at a preset angle, each of the protrusions is blocked at the corresponding limiting edge.

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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