A sealing assembly and liquid injection apparatus

Abstract

This application discloses a sealing assembly and a liquid injection device. The sealing assembly is used to assist in liquid injection of a battery cell in a liquid injection system. The sealing assembly includes a first sealing body and a second sealing body. The first sealing body has a first channel and is adapted to be inserted into the liquid injection hole to communicate with the battery cell. The second sealing body has a second channel and is adapted to communicate with the liquid injection system. The second sealing body is movably connected to the first sealing body and can move relative to the first sealing body to connect or disconnect the first and second channels. Thus, during the liquid injection process, by moving the second sealing body, the communication state between the first and second channels can be switched, thereby realizing the connection or disconnection between the liquid injection system and the receiving cavity for liquid injection or formation processes of the battery cell, without the need for repeated insertion and removal of the sealing assembly, reducing wear on the sealing assembly, and reducing the operation of the liquid injection process, thus minimizing the impact on battery quality.

Description

Technical Field

[0001] This application belongs to the field of battery manufacturing technology, specifically relating to a sealing component and a liquid injection device. Background Technology

[0002] Battery electrolyte filling is one of the key processes in lithium-ion battery production, directly affecting the battery's electrolyte wettability, cycle life, and safety. Before the battery is fully filled and sealed by welding, the filling port needs to be temporarily sealed to prevent moisture from the air from entering the battery during intermediate processes and affecting the final battery quality.

[0003] In related technologies, rubber sealing pins are typically inserted into the injection port for temporary sealing after one injection is completed. However, since the injection port needs to be opened multiple times in the intermediate process, the rubber sealing pins need to be repeatedly inserted and removed, which can easily damage the rubber sealing pins and affect the quality of the battery. Utility Model Content

[0004] This application aims to provide a sealing component and a liquid injection device that can solve the problem in related technologies where temporary sealing is achieved by inserting a rubber sealing pin into the liquid injection port. However, due to the need to open the liquid injection port multiple times in the intermediate process, the rubber sealing pin needs to be repeatedly inserted and removed, which can easily damage the rubber sealing pin and affect the quality of the battery.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a sealing assembly for assisting in the injection of a battery cell into a liquid injection system, wherein the battery cell has an injection hole; the sealing assembly includes: a first sealing body and a second sealing body; the first sealing body is provided with a first channel, and the first sealing body is adapted to be inserted into the injection hole so that the first channel communicates with the battery cell; the second sealing body is provided with a second channel, and the second channel is adapted to communicate with the liquid injection system.

[0007] The second sealing body is movably connected to the first sealing body, and the second sealing body is movable relative to the first sealing body to make the first channel and the second channel connect or disconnect.

[0008] Optionally, the first sealing body is provided with a mounting groove, the first channel is provided in the groove wall of the mounting groove, and the first channel communicates with the mounting groove;

[0009] The second sealing body includes a main body and a movable part connected to each other. The movable part is inserted into the mounting groove. The main body has a first hole and the movable part has a second hole. One end of the first hole is adapted to communicate with the liquid injection system, and the other end of the first hole communicates with the second hole to form the second channel. The circumferential sidewall of the movable part has a first opening that communicates with the second hole.

[0010] The movable part is capable of moving within the mounting slot to make the first opening connect or disconnect from the first channel.

[0011] Optionally, multiple first channels are provided, and the multiple first channels are spaced apart along the circumferential groove wall of the mounting groove. The first opening can be connected to or disconnected from at least one first channel.

[0012] Alternatively, multiple first openings may be provided, with the multiple first openings spaced apart along the circumferential sidewall of the movable part, and the first channel may be connected to or disconnected from at least one of the first openings.

[0013] Optionally, the second sealing body further includes a sealing portion connected to the circumferential outer side of the main body, the sealing portion being capable of sealing the circumferential direction of the injection hole;

[0014] And / or, the second sealing body further includes an abutment portion connected to the main body portion, the abutment portion being adapted to abut against the wall of the injection hole.

[0015] Optionally, the sealing assembly has a first direction, and the movable part is movable relative to the mounting groove along the first direction to make the first opening connect or disconnect from the first channel.

[0016] Optionally, the mounting groove has a groove opening and a groove bottom arranged opposite to each other along the first direction. The movable part is provided with a first elastic part at one end facing the groove bottom. The first elastic part abuts against the groove bottom. The movable part can move relative to the mounting groove along the first direction so that the first elastic part switches between a deformed state and a natural state. When the first elastic part is in the deformed state, the first opening is connected to the first channel. When the first elastic part is in the natural state, the first opening is disconnected from the first channel.

[0017] Optionally, the mounting groove has a groove opening and a groove bottom disposed opposite to each other along the first direction. The groove bottom is provided with a second elastic part. The movable part can move relative to the mounting groove along the first direction to press the second elastic part, so that the second elastic part switches between a deformed state and a natural state. When the second elastic part is in the deformed state, the first opening is connected to the first channel. When the second elastic part is in the natural state, the first opening is disconnected from the first channel.

[0018] Optionally, the sealing assembly has a first direction, the groove wall of the mounting groove is provided with a second opening and a first partition, the second opening communicates with the first channel, and the first partition and the second opening are arranged adjacent to each other along the circumference of the mounting groove; the second sealing body can rotate relative to the first sealing body about the first direction, so that the second opening communicates with the first opening, or so that the first partition blocks the first opening.

[0019] And / or, the movable part is further provided with a second partition, the second partition being disposed adjacent to the first opening along the circumference of the movable part, and the second sealing body being rotatable relative to the first sealing body about the first direction, so that the first opening communicates with the first channel, or the second partition blocks the first channel.

[0020] Optionally, the first sealing body is provided with a connecting groove, the connecting groove is arranged around the outer peripheral surface of the first sealing body, the connecting groove is connected to the first channel, and the portion of the first sealing body with the connecting groove is adapted to extend into the battery cell.

[0021] Secondly, embodiments of this application provide a liquid injection device, including: a sealing assembly as described in any of the preceding claims.

[0022] In embodiments of this application, a sealing assembly is used to assist in electrolyte injection into a battery cell. The battery cell has an injection hole, and the sealing assembly includes a first sealing body and a second sealing body. The first sealing body has a first channel and is adapted to be inserted into the injection hole to communicate with the battery cell. The second sealing body has a second channel and is adapted to communicate with the electrolyte injection system. The second sealing body is movably connected to the first sealing body and can move relative to the first sealing body to connect or disconnect the first and second channels. Thus, during the electrolyte injection process, by moving the second sealing body, the communication state between the first and second channels can be switched, thereby enabling the electrolyte injection system to connect or disconnect from the receiving cavity for electrolyte injection or formation processes of the battery cell. This eliminates the need for repeated insertion and removal of the sealing assembly, reducing wear on the sealing assembly and minimizing the operational steps involved in the electrolyte injection process, thus reducing the impact on battery quality.

[0023] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is a schematic diagram of a sealing assembly according to an embodiment of this application;

[0026] Figure 2 This is an exploded view of the sealing assembly according to an embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the second sealing body in a closed state according to an embodiment of this application;

[0028] Figure 4 This is a schematic diagram of the second sealing body in the conductive state according to an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the first sealing body according to an embodiment of this application;

[0030] Figure 6 It is in accordance with this application along Figure 5 Cross-sectional view of line AA in the middle;

[0031] Figure 7 This is a schematic diagram of the second sealing body according to an embodiment of this application;

[0032] Figure 8 It is in accordance with this application along Figure 7 Cross-sectional view of the middle BB line;

[0033] Figure 9 This is a partial structural schematic diagram of a battery cell according to an embodiment of this application;

[0034] Figure 10 This is a schematic diagram of the installation of the sealing assembly according to an embodiment of this application.

[0035] Figure label:

[0036] 1: Battery cell; 11: Electrolyte filling port; 12: Receiving cavity;

[0037] 2: Sealing assembly; 21: First sealing body; 210: First channel; 211: Mounting groove; 2111: Second opening; 2112: First partition; 213: Connecting groove; 22: Second sealing body; 220: Second channel; 221: Main body; 2210: First hole; 222: Movable part; 2220: Second hole; 2221: First opening; 2222: First elastic part; 2223: Second partition; 223: Sealing part; 224: Abutting part; X: First direction. Detailed Implementation

[0038] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0039] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0040] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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 of this application.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 based on the specific circumstances.

[0042] Before explaining the sealing components and liquid injection devices provided in the embodiments of this application, the application scenarios of the sealing components and liquid injection devices provided in the embodiments of this application will be specifically described:

[0043] After the battery cell is assembled, it generally undergoes the following process: baking → primary electrolyte injection → high-temperature wetting → negative pressure formation → high-temperature aging → secondary electrolyte injection → sealing nail welding → secondary helium test. In this process, after the primary electrolyte injection, rubber sealing nails are usually inserted into the electrolyte injection hole of the battery cell to temporarily seal it, thereby preventing the electrolyte in the battery cell from being exposed to the air. This would allow moisture from the air to enter the electrolyte, causing the water content in the electrolyte and electrode to exceed the standard. This would affect the performance of the battery cell during the charging and activation process in the negative pressure formation process, leading to problems such as poor battery cell interface, abnormal gas production, and blackening of the electrode interface.

[0044] Therefore, after the first electrolyte injection, a rubber sealing pin is inserted into the electrolyte injection hole of the battery cell, changing the above process to: baking → first electrolyte injection → first pin insertion → high temperature wetting → first pin removal → negative pressure formation → second pin insertion → high temperature aging → second pin removal and second electrolyte injection → sealing pin welding → second helium test. In this process, the rubber sealing pin needs to be inserted and removed twice, which can easily damage the rubber sealing pin, and may also lead to low efficiency, missed insertion and removal, and other risks, and may easily affect the quality of the battery.

[0045] Therefore, this application provides a sealing component and a liquid injection device. The sealing component and liquid injection device provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0046] like Figure 1 , Figure 2 and Figure 10 As shown, in some embodiments of the application, the sealing assembly 2 is used to assist in the injection of liquid into the battery cell 1 in the liquid injection system. The battery cell 1 has an injection hole 11. The sealing assembly 2 includes a first sealing body 21 and a second sealing body 22. The first sealing body 21 is provided with a first channel 210 and is adapted to be inserted into the injection hole 11 so that the first channel 210 communicates with the battery cell 1. The second sealing body 22 is provided with a second channel 220 and is adapted to communicate with the liquid injection system. The second sealing body 22 is movably connected to the first sealing body 21 and is movable relative to the first sealing body 21 so that the first channel 210 and the second channel 220 are connected or disconnected.

[0047] In this embodiment, the second sealing body 22 is movable relative to the first sealing body 21 to make the first channel 210 and the second channel 220 connected or disconnected. In this way, after the first liquid injection process of the battery cell, the second sealing body 22 can be moved as needed to realize the connection or disconnection between the battery cell 1 and the liquid injection system, thereby eliminating the need to repeatedly insert and remove the sealing component 2, reducing the wear of the sealing component 2, reducing the operation of the liquid injection process, and reducing the impact on the quality of the battery.

[0048] In a specific application, for example, after one liquid injection process, the first sealing body 21 of the sealing assembly 2 is inserted into the liquid injection hole 11 of the battery cell 1. Before the high-temperature wetting process, the relative position between the second sealing body 22 and the first sealing body 21 is adjusted so that the first channel 210 and the second channel 220 are disconnected, that is, the liquid injection hole 11 is sealed. After the high-temperature wetting process and before the negative pressure formation process, the relative position between the second sealing body 22 and the first sealing body 21 is adjusted so that the first channel 210 and the second channel 220 are connected, and the battery cell 1 is connected through the first channel 210 and the second channel 220. The second channel 220 can be connected to the electrolyte injection system, thereby enabling the formation of the battery cell 1. Between the negative pressure formation process and the high-temperature aging process, the second sealing body 22 is adjusted to disconnect the first channel 210 and the second channel 220 again, thereby enabling the battery cell 1 to undergo high-temperature aging and reducing the possibility of water entering the electrolyte. Before the second electrolyte injection after the high-temperature aging process, the second sealing body 22 is adjusted to reconnect the first channel 210 and the second channel 220. The battery cell 1 can be connected to the electrolyte injection system through the first channel 210 and the second channel 220, thereby enabling the battery cell 1 to be injected with electrolyte.

[0049] It should be explained that the sealing component 2 has a conductive state and a closed state. When the sealing component 2 is in the conductive state, the first channel 210 is connected to the second channel 220. When the sealing component 2 is in the closed state, the first channel 210 is disconnected from the second channel 220. The second channel 220 is suitable for connection with the liquid injection system. Thus, when the sealing component 2 switches to the conductive state, the liquid injection system can connect to the battery cell 1 through the second channel 220 and the first channel 210, thereby enabling the battery cell 1 to undergo a negative pressure formation process or a secondary liquid injection process. The liquid injection system can specifically be a formation tube or a liquid injection tube. The formation tube or liquid injection tube is connected to the battery cell 1 through the sealing component 2, thus avoiding direct pressing on the liquid injection hole 11, reducing the possibility of electrolyte residue in the liquid injection hole 11 of the battery cell 1, eliminating the need to clean the liquid injection hole 11, and improving the processing efficiency of the battery cell. Those skilled in the art can configure it according to actual needs, and this application does not impose any restrictions on this.

[0050] Understandably, the second sealing body 22 is movably connected to the first sealing body 21, and can be at least one of the following connection methods: sliding connection, plug-in connection, rotational connection, etc. Those skilled in the art can set it according to actual needs, and this application does not limit it.

[0051] Specifically, the second sealing body 22 can move relative to the first sealing body 21, either by moving along the first direction X or by rotating around the first direction X, thereby switching the first channel 210 and the second channel 220 between being on and off.

[0052] It should be noted that the battery cell 1 has a receiving cavity 12, the liquid injection hole 11 is connected to the receiving cavity 12, and the first channel 210 is connected to the battery cell 1. Specifically, this means that the first channel 210 is connected to the receiving cavity 12 of the battery cell 1. In actual use, such as... Figure 10 As shown, the first sealing body 21 is inserted into the injection hole 11, so that the first channel 210 is connected to the receiving cavity 12 of the battery cell 1.

[0053] like Figures 1 to 10 As shown, in some embodiments of this application, the first sealing body 21 is provided with a mounting groove 211, and a first channel 210 is provided in the groove wall of the mounting groove 211, and the first channel 210 communicates with the mounting groove 211; the second sealing body 22 includes a main body 221 and a movable part 222 connected to each other, the movable part 222 is inserted into the mounting groove 211, the main body 221 is provided with a first hole 2210, the movable part 222 is provided with a second hole 2220, one end of the first hole 2210 is adapted to communicate with the liquid injection system, and the other end of the first hole 2210 communicates with the second hole 2220 to form a second channel 220, and the circumferential sidewall of the movable part 222 is provided with a first opening 2221 communicating with the second hole 2220; the movable part 222 can move in the mounting groove 211 so that the first opening 2221 is connected to or disconnected from the first channel 210.

[0054] In the embodiments of this application, such as Figure 3 and Figure 4 As shown, when the second sealing body 22 moves or rotates relative to the first sealing body 21, the first channel 210 can sequentially communicate with the liquid injection system through the first opening 2221, the second hole 2220, and the first hole 2210, thereby changing the relative position between the movable part 222 and the mounting groove 211, thus achieving connection or disconnection. The structure is simpler and the operation is more convenient.

[0055] It should be noted that the first opening 2221 is correspondingly provided with the first channel 210, so that when the second sealing body 22 moves or rotates relative to the first sealing body 21, the first opening 2221 can connect or disconnect with the first channel 210. The second sealing body 22 can move relative to the first sealing body 21, which can be sliding relative to the first sealing body 21 along the first direction X, or rotating relative to the first sealing body 21 around the first direction X, or other movable connection forms, as long as the first opening 2221 and the first channel 210 can be switched between connected or disconnected states. Those skilled in the art can set it according to actual needs.

[0056] In a specific application, the main body 221 is provided with a first hole 2210, and the movable part 222 is provided with a second hole 2220. One end of the first hole 2210 is adapted to communicate with the liquid injection system, and the other end of the first hole 2210 communicates with the second hole 2220 to form a second channel 220. The circumferential sidewall of the movable part 222 is provided with a first opening 2221 that communicates with the second hole 2220. Thus, when the first channel 210 and the second channel 220 are connected, the formation tube or liquid injection tube of the liquid injection system can communicate with the receiving cavity 12 of the battery cell 1 in sequence through the first hole 2210, the second hole 2220, the first opening 2221, and the first channel 210. Thus, negative pressure can be drawn into the receiving cavity 12 of the battery cell 1 during the negative pressure formation process, or electrolyte can be injected into the receiving cavity 12 of the battery cell 1 during the secondary liquid injection process.

[0057] It should be noted that, as Figure 3 , Figure 4 and Figure 8 As shown, the first hole 2210 penetrates the main body 221 to form a connection port on the side of the main body 221 away from the movable part 222, so as to facilitate connection with the formation tube or injection tube of the injection system.

[0058] Understandably, the formation tube or injection tube of the liquid injection system can sequentially communicate with the receiving cavity 12 of the battery cell 1 through the first hole 2210, the second hole 2220, the first opening 2221, and the first channel 210, thereby allowing electrolyte to be injected through the injection hole 11, or positive and negative pressure to be drawn. The receiving cavity 12 contains an electrode assembly and electrolyte. The electrode assembly is mainly formed by winding or stacking positive and negative electrode plates, and a separator is usually provided between the positive and negative electrode plates to separate them and prevent internal short circuits. The active material portions of the positive and negative electrode plates constitute the main body of the electrode assembly.

[0059] Understandably, an electrolyte is a solution containing free ions that can conduct electricity. It plays a crucial role in electrochemical reactions; the ions in the electrolyte can conduct charge, while the electrolyte ensures the stability of the electrochemical reaction. Electrolytes can include at least one of the following: acidic electrolytes, such as sulfuric acid; alkaline electrolytes, such as potassium hydroxide; and organic electrolytes, such as lithium salts dissolved in organic solvents. Those skilled in the art can configure the electrolyte according to actual needs, and this application does not impose any limitations on this.

[0060] In specific applications, such as Figure 4 , Figure 8 and Figure 10 As shown, the second sealing body 22 includes a main body 221 and a movable part 222. The movable part 222 is located on the side of the main body 221 facing the first sealing body 21. The movable part 222 is inserted into the mounting groove 211. The movable part 222 can move relative to the mounting groove 211, thereby allowing the first opening 2221 on the movable part 222 to communicate or disconnect from the first channel 210 on the mounting groove 211.

[0061] It should be explained that the first channel 210 is disposed on the circumferential sidewall of the mounting groove 211, and the first opening 2221 is disposed on the circumferential sidewall of the movable part 222. In this way, when the movable part 222 moves relative to the mounting groove 211, it can achieve connection or disconnection. For example, when the movable part 222 moves relative to the mounting groove 211 along the first direction X, the first channel 210 and the first opening 2221 can be connected or disconnected; or the movable part 222 rotates relative to the mounting groove 211 around the first direction X, the first channel 210 and the first opening 2221 can be connected or disconnected. The specific movable connection form between the movable part 222 and the mounting groove 211 can realize the connection or disconnection between the first channel 210 and the first opening 2221. Those skilled in the art can set it according to actual needs, and this application does not limit it.

[0062] like Figures 3 to 8 As shown, in some embodiments of this application, a plurality of first channels 210 are provided, and the plurality of first channels 210 are spaced apart along the circumferential groove wall of the mounting groove 211. The first opening 2221 can be connected to or disconnected from at least one first channel 210.

[0063] In this embodiment of the application, by setting multiple first channels 210, the structure of the sealing component 2 becomes more flexible and can be set according to actual needs, thereby improving the operability of the sealing component 2.

[0064] In specific applications, multiple first channels 210 are provided, and one or more first openings 2221 can be provided. When the sealing assembly 2 is in the conducting state (i.e., the first channel 210 is connected to the second channel 220), the first opening 2221 can be connected to one of the first channels 210. When the sealing assembly 2 is in the closed state, multiple first channels 210 are blocked by the second sealing body 22 except for the first opening 2221.

[0065] In specific applications, the number of first channels 210 can be set to any value such as 1, 2, 3, 4, 5, 6, etc. The specific number of first channels 210 depends on the circumferential dimension of the mounting slot 211; those skilled in the art can set it according to actual needs, and this application does not limit it in this regard.

[0066] like Figures 3 to 8 As shown, in some embodiments of this application, multiple first openings 2221 are provided, and multiple first openings 2221 are spaced apart along the circumferential sidewall of the movable part 222. The first channel 210 can be connected to or disconnected from at least one first opening 2221.

[0067] In this embodiment of the application, by setting multiple first openings 2221, the structure of the sealing component 2 becomes more flexible and can be set according to actual needs, thereby improving the operability of the sealing component 2.

[0068] In specific applications, multiple first openings 2221 are provided, and one or more first channels 210 can be provided. When the sealing component 2 is in the conducting state, the first channel 210 can communicate with one of the first openings 2221. When the sealing component 2 is in the closed state, multiple first openings 2221 are blocked by the part of the first sealing body 21 except for the first channel 210.

[0069] In specific applications, the number of first openings 2221 can be set to any value such as 1, 2, 3, 4, 5, 6, etc. The specific number of first openings 2221 depends on the circumferential dimension of the movable part 222; those skilled in the art can set it according to actual needs, and this application does not limit it in this regard.

[0070] Of course, multiple first channels 210 and multiple first openings 2221 can be set one-to-one, so that when the movable part 222 moves relative to the mounting slot 211, the connection or disconnection between each first channel 210 and a first opening 2221 can be switched.

[0071] like Figure 4 and Figure 8As shown, in some embodiments of this application, the second sealing body 22 further includes a sealing part 223, which is connected to the circumferential outer side of the main body 221 and can seal the circumferential direction of the injection hole 11.

[0072] In this embodiment of the application, by connecting the sealing part 223 to the circumferential outer side of the main body 221, the circumferential of the injection hole 11 can be sealed, thereby improving the sealing effect of the sealing assembly 2 on the injection hole 11, reducing the possibility of external moisture entering the receiving cavity 12 of the cell 1, and improving the production quality of the battery.

[0073] In a specific application, the sealing part 223 is arranged in a ring on the circumferential outer side of the main body 221. When the second sealing body 22 moves toward the first sealing body 21, the sealing part 223 abuts against the outer periphery of the battery cell 1, thereby forming a circumferential seal on the injection hole 11.

[0074] like Figure 4 and Figure 8 As shown, in some embodiments of this application, the second sealing body 22 further includes an abutment portion 224, which is connected to the main body portion 221 and abuts against the wall of the injection hole 11.

[0075] In this embodiment, the abutment portion 224 is arranged around the movable portion 222, and the abutment portion 224 abuts against the wall of the injection hole 11, thereby sealing the gap between the sealing assembly 2 and the injection hole 11 and reducing the possibility of external moisture entering the cell 1.

[0076] In practical applications, there is a gap between the abutting part 224 and the movable part 222, which allows at least a portion of the first sealing body 21 to move within the gap, that is, to give the first sealing body 21 sufficient travel so that the first channel 210 and the first opening 2221 can be fully connected or isolated.

[0077] It needs to be explained that, such as Figure 4 , Figure 8 , Figure 9 and Figure 10 As shown, the sidewall of the injection hole 11 is stepped. The first sealing body 21 is inserted into the hole at the lower end of the step, and the abutment portion 224 is adapted to abut against the hole wall at the upper end of the step, thereby sealing the injection hole 11. Furthermore, since there is a gap between the abutment portion 224 and the movable portion 222, at least a portion of the first sealing body 21 can move within the gap when the second sealing body 22 moves downward relative to the first sealing body 21.

[0078] In specific applications, the outer peripheral shape of the abutment portion 224 is adapted to a portion of the outer peripheral shape of the injection hole 11. For example, such as... Figure 8 , Figure 9 and Figure 10 As shown, the injection hole 11 is partially inclined, and the outer periphery of the contact portion 224 is also inclined, so that the contact portion 224 can form a better sealing connection with the injection hole 11, reducing the entry of water.

[0079] like Figures 1 to 10 As shown, in some embodiments of this application, the sealing assembly 2 has a first direction X, and the movable part 222 is movable relative to the mounting groove 211 along the first direction X to make the first opening 2221 connected to or disconnected from the first channel 210.

[0080] In this embodiment, by moving the movable part 222 relative to the mounting groove 211 along the first direction X, the first opening 2221 is connected or disconnected from the first channel 210, resulting in a simpler structure and more convenient operation.

[0081] It should be noted that the first direction X specifically refers to the height direction of the sealing component 2. In actual use, the first direction X is the vertical direction.

[0082] In a specific application, the first sealing body 21 is inserted into the injection hole 11, and the second sealing body 22 can move relative to the first sealing body 21 in a direction away from the battery cell 1 or in the direction of the battery cell 1 under the action of external force; that is, the first opening 2221 on the movable part 222 can move relative to the first channel 210 on the wall of the mounting groove 211, thereby realizing the connection or isolation between the first opening 2221 and the first channel 210.

[0083] like Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown, in some embodiments of this application, the mounting groove 211 has a groove opening and a groove bottom arranged opposite to each other along the first direction X. The movable part 222 is provided with a first elastic part 2222 at one end facing the groove bottom. The first elastic part 2222 abuts against the groove bottom. The movable part 222 can move relative to the mounting groove 211 along the first direction X so that the first elastic part 2222 switches between a deformed state and a natural state. When the first elastic part 2222 is in the deformed state, the first opening 2221 is connected to the first channel 210. When the first elastic part 2222 is in the natural state, the first opening 2221 is disconnected from the first channel 210.

[0084] In this embodiment, a first elastic part 2222 is provided at one end of the movable part 222 facing the bottom of the mounting groove 211. This elastic part can be deformed under pressure, thereby causing the second sealing body 22 to move downward, so that the first opening 2221 communicates with the first channel 210. The structure is simpler and the operation is more convenient.

[0085] It should be noted that when the second sealing body 22 is installed inside the first sealing body 21, the first opening 2221 corresponds to the position of the first channel 210 along the first direction X, so that when the first elastic part 2222 is in a deformed state (deformed under pressure), the first opening 2221 can be connected to the first channel 210; when the first elastic part 2222 is in a natural state (rebounded without force), the first opening 2221 is disconnected from the first channel 210.

[0086] In specific applications, the first elastic part 2222 can be at least one of rubber, silicone, thermoplastic elastomer, foam material, etc., capable of deformation under pressure and rebound under no pressure. At the same time, the first elastic part 2222 can be integrally formed with the movable part 222 or separately formed. For example, both the first elastic part 2222 and the movable part 222 are rubber, and the elastic modulus of the first elastic part 2222 is smaller than that of the movable part 222 excluding the first elastic part 2222. It is processed by injection molding. Those skilled in the art can set it according to actual needs, and this application does not limit it.

[0087] It should be explained that the pressure on the first elastic part 2222 is transmitted from the second sealing body 22. In specific applications, for example, the operator may apply pressure to the top of the second sealing body 22 to connect the first channel 210 and the first opening 2221; or the pressure may be applied to the second sealing body 22 by an external connecting pipe, such as an injection pipe or a formation pipe, when connected to the second sealing body 22, thereby connecting the first channel 210 and the first opening 2221. The specific pressure application method can be selected by those skilled in the art according to actual needs, and this application does not limit it.

[0088] In some embodiments of this application, the mounting groove 211 has a groove opening and a groove bottom arranged opposite to each other along the first direction X. The groove bottom is provided with a second elastic part (not shown in the figure). The movable part 222 can move relative to the mounting groove 211 along the first direction X to press the second elastic part, so that the second elastic part switches between a deformed state and a natural state. When the second elastic part is in the deformed state, the first opening 2221 is connected to the first channel 210. When the second elastic part is in the natural state, the first opening 2221 is disconnected from the first channel 210.

[0089] In this embodiment, by providing a second elastic part at the end of the mounting groove 211 away from the second sealing body 22, pressure can be applied to the second sealing body 22 to connect the first opening 2221 with the first channel 210, resulting in a simpler structure and more convenient operation.

[0090] It should be noted that when the second sealing body 22 is installed inside the first sealing body 21, the first opening 2221 corresponds to the position of the first channel 210 along the first direction X, so that when the second elastic part is deformed by pressure, the first opening 2221 can be connected to the first channel 210; when the second elastic part rebounds, the first opening 2221 is disconnected from the first channel 210.

[0091] In specific applications, the second elastic part can be at least one of rubber, silicone, thermoplastic elastomer, foam material, etc., capable of deformation under pressure and rebound under no pressure. At the same time, the second elastic part can be integrally formed with the first sealing body 21 or separately formed. For example, the second elastic part and the first sealing body 21 can both be rubber, and the elastic modulus of the second elastic part is less than that of the part of the first sealing body 21 excluding the second elastic part. It is processed by injection molding. Those skilled in the art can set it according to actual needs, and this application does not limit it.

[0092] It should be explained that the pressure on the second elastic part is transmitted from the second sealing body 22. In specific applications, for example, the operator may apply pressure to the top of the second sealing body 22 to connect the first channel 210 and the first opening 2221; or the pressure may be applied to the second sealing body 22 by an external connecting pipe, such as an injection pipe and a formation pipe, when connected to the second sealing body 22, thereby connecting the first channel 210 and the first opening 2221. The specific pressure application method can be selected by those skilled in the art according to actual needs, and this application does not limit it.

[0093] like Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown, in some embodiments of this application, the movable part 222 is provided with a sealing part (not shown in the figure) at one end facing the bottom of the mounting groove 211. When the movable part 222 abuts against the bottom of the mounting groove 211, the first opening 2221 is connected to the first channel 210. When the movable part 222 separates from the bottom of the mounting groove 211, the sealing part blocks the first channel 210.

[0094] In this embodiment, by providing a sealing part at one end of the movable part 222 facing the bottom of the mounting groove 211, the first channel 210 of the sealing part can be blocked by lifting or pressing down the second sealing body 22, or the first opening 2221 can be connected to the first channel. The structure is simpler and the operation is more convenient.

[0095] It should be explained that the sealing part is specifically located on the side of the movable part 222 facing the bottom of the mounting groove 211, and the sealing part can completely block the first channel 210 when the movable part 222 moves relative to the mounting groove 211; at this time, the minimum distance between the first channel 210 and the end of the mounting groove 211 away from the second sealing body 22 is greater than the size of the sealing part along the first direction X.

[0096] like Figures 6 to 8 As shown, in some embodiments of this application, the sealing assembly 2 has a first direction X, the groove wall of the mounting groove 211 is provided with a second opening 2111 and a first partition 2112, the second opening 2111 communicates with the first channel 210, and the first partition 2112 and the second opening 2111 are arranged adjacent to each other along the circumference of the mounting groove 211; the second sealing body 22 can rotate relative to the first sealing body 21 about the first direction X, so that the second opening 2111 communicates with the first opening 2221, or the first partition 2112 blocks the first opening 2221.

[0097] In this embodiment of the application, by providing a second opening 2111 and a first partition 2112 that are circumferentially adjacent to each other on the wall of the mounting groove 211, the first channel 210 and the first opening 2221 can be connected or disconnected by rotating the second sealing body 22. When the first partition 2112 blocks the first opening 2221, the first channel 210 is disconnected from the first opening 2221; when the second opening 2111 is connected to the first opening 2221, the first channel 210 is connected to the first opening 2221 through the second opening 2111.

[0098] like Figures 6 to 8 As shown, in some embodiments of this application, the movable part 222 is further provided with a second partition part 2223. The second partition part 2223 and the first opening 2221 are arranged adjacent to each other in the circumferential direction of the movable part 222. The second sealing body 22 can rotate relative to the first sealing body 21 about the first direction X, so that the first opening 2221 communicates with the first channel 210, or the second partition part 2223 blocks the first channel 210.

[0099] In this embodiment of the application, by providing an adjacent second partition 2223 along the circumference of the movable part 222 in the first opening 2221, the first channel 210 and the first opening 2221 can be connected or disconnected by rotating the second sealing body 22. When the second partition 2223 blocks the first channel 210, the first channel 210 is disconnected from the first opening 2221.

[0100] Alternatively, there can be a first partition 2112 between two adjacent first channels 210, and a second partition 2223 between two adjacent first openings 2221. The second sealing body 22 can rotate relative to the first sealing body 21 around the first direction X. When the sealing assembly 2 is in the conducting state, each first channel 210 is connected to a first opening 2221. When the sealing assembly 2 is in the closed state, the second partition 2223 blocks the second opening 2111, which means it blocks the first channel 210, and the first partition 2112 blocks the first opening 2221.

[0101] It should be noted that when the sealing assembly 2 is in a closed state, the second partition 2223 blocks the second opening 2111, which is to block the first channel 210, and the first partition 2112 blocks the first opening 2221. The sealing assembly 2 seals the liquid injection hole 11, reducing the possibility of external moisture entering the cell 1.

[0102] It should be explained that, in practical applications, the second sealing body 22 has corresponding graduations on the side face opposite to the first sealing body 21. During installation, the first channel 210 and the second channel 220 are kept in communication so that the first sealing body 21 can be inserted into the injection hole 11. When it is necessary to seal the injection hole 11, the second sealing body 22 is rotated by a preset angle so that the first channel 210 and the second channel 220 are disconnected, thereby making the sealing assembly 2 in a closed state to seal the injection hole 11. Of course, it is also possible to keep the first channel 210 and the second channel 220 disconnected during installation, and the method of adjusting the continuity of the sealing assembly 2 is the same as described above, which will not be repeated here.

[0103] It should be explained that during actual installation, when the first opening 2221 corresponds to the first channel 210 along the first direction X, the second sealing body 22 is installed into the first sealing body 21. At this time, the sealing assembly 2 is in a conductive state. Rotating the second sealing body 22 causes the second opening 2111 (first channel 210) to correspond to the second partition 2223, and the first opening 2221 to correspond to the first partition 2112. At this time, the sealing assembly 2 is in a closed state.

[0104] Understandably, the circumferential dimension of the first channel 210 along the mounting groove 211 can be the same as the circumferential dimension of the first partition 2112 along the mounting groove 211, or the circumferential dimension of the first partition 2112 can be greater than the circumferential dimension of the first channel 210, thereby facilitating the sealing of the first channel 210; the circumferential dimensions of the first opening 2221 and the second partition 2223 are similarly set.

[0105] like Figures 3 to 6As shown, in some embodiments of this application, the first sealing body 21 is provided with a connecting groove 213, the connecting groove 213 is arranged around the outer peripheral surface of the first sealing body 21, the connecting groove 213 communicates with the first channel 210, and the portion of the first sealing body 21 with the connecting groove 213 is adapted to extend into the battery cell 1.

[0106] In this embodiment of the application, by providing a connecting groove 213 around the outer peripheral surface of the first sealing body 21, the overall weight of the first sealing body 21 can be reduced, and the communication path between the first channel 210 and the receiving cavity 12 can be reduced. Thus, when the battery cell 1 is injected with electrolyte through the sealing assembly 2, the flow path of the electrolyte can be reduced, and the efficiency of electrolyte injection can be improved.

[0107] In specific applications, the connecting groove 213 is arranged around the outer peripheral surface of the first sealing body 21 in the first direction X. It can be partially arranged, for example, only arranged at the location where the first channel 210 is provided; or it can be arranged around the entire periphery, that is, the connecting groove 213 surrounds the outer periphery of the first sealing body 21.

[0108] It should be explained that the portion of the first sealing body 21 with the connecting groove 213 extends into the receiving cavity 12, thereby facilitating the connection between the external connecting pipe and the receiving cavity 12 when the sealing assembly 2 is in the conductive state.

[0109] In some embodiments of this application, a liquid injection device is also proposed, which includes a sealing component 2 as described in any of the above embodiments.

[0110] In this embodiment, the sealing assembly 2 is used to assist in the electrolyte injection of the battery cell 1. The battery cell 1 has an injection hole 11. The sealing assembly 2 includes a first sealing body 21 and a second sealing body 22. The first sealing body 21 has a first channel 210 and is adapted to be inserted into the injection hole 11 so that the first channel 210 communicates with the battery cell 1. The second sealing body 22 has a second channel 220 and is adapted to communicate with the electrolyte injection system. The second sealing body 22 is movably connected to the first sealing body 21 and can move relative to the first sealing body 21 so that the first channel 210 and the second channel 220 are connected or disconnected. In this way, after one electrolyte injection process of the battery cell, the second sealing body 22 can be moved as needed to realize the connection or disconnection between the battery cell 1 and the electrolyte injection system, thereby eliminating the need to repeatedly insert and remove the sealing assembly 2, reducing the wear of the sealing assembly 2, reducing the operation of the electrolyte injection process, and reducing the impact on the quality of the battery.

[0111] In specific applications, the liquid injection device includes a formation tube and a liquid injection tube, which are connected to the second channel 220. The specific tube that the second channel 220 is connected to can be selected by those skilled in the art according to the actual situation, and this application does not impose any restrictions on this.

[0112] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example 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. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0113] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A sealing assembly for assisting in the injection of a battery cell (1) into a liquid injection system, the battery cell (1) having an injection port (11), characterized in that, The sealing assembly (2) includes: a first sealing body (21) and a second sealing body (22); The first sealing body (21) is provided with a first channel (210), and the first sealing body (21) is adapted to be inserted into the injection hole (11) so that the first channel (210) is connected to the battery cell (1); the second sealing body (22) is provided with a second channel (220), and the second channel (220) is adapted to be connected to the injection system; The second sealing body (22) is movably connected to the first sealing body (21), and the second sealing body (22) is movable relative to the first sealing body (21) to make the first channel (210) and the second channel (220) connected or disconnected.

2. The sealing assembly according to claim 1, characterized in that, The first sealing body (21) is provided with a mounting groove (211), and the first channel (210) is provided on the groove wall of the mounting groove (211), and the first channel (210) communicates with the mounting groove (211); The second sealing body (22) includes a main body (221) and a movable part (222) connected to each other. The movable part (222) is inserted into the mounting groove (211). The main body (221) has a first hole (2210) and the movable part (222) has a second hole (2220). One end of the first hole (2210) is adapted to communicate with the liquid injection system, and the other end of the first hole (2210) communicates with the second hole (2220) to form the second channel (220). The circumferential sidewall of the movable part (222) has a first opening (2221) that communicates with the second hole (2220). The movable part (222) is movable within the mounting groove (211) to make the first opening (2221) connect or disconnect from the first channel (210).

3. The sealing assembly according to claim 2, characterized in that, The first channel (210) is provided in multiple ways, and the multiple first channels (210) are spaced apart along the circumferential groove wall of the mounting groove (211). The first opening (2221) can be connected to or disconnected from at least one first channel (210). Alternatively, multiple first openings (2221) may be provided, with multiple first openings (2221) spaced apart along the circumferential sidewall of the movable part (222), and the first channel (210) may be connected to or disconnected from at least one first opening (2221).

4. The sealing assembly according to claim 2, characterized in that, The second sealing body (22) further includes a sealing part (223), which is connected to the circumferential outer side of the main body (221) and can seal the circumferential direction of the injection hole (11); And / or, the second sealing body (22) further includes an abutment portion (224) connected to the main body portion (221), the abutment portion (224) being adapted to abut against the wall of the injection hole (11).

5. The sealing assembly according to any one of claims 2-4, characterized in that, The sealing assembly (2) has a first direction (X), and the movable part (222) is movable relative to the mounting groove (211) along the first direction (X) to make the first opening (2221) connected to or disconnected from the first channel (210).

6. The sealing assembly according to claim 5, characterized in that, The mounting groove (211) has a groove opening and a groove bottom arranged opposite each other along the first direction (X). The movable part (222) has a first elastic part (2222) at one end facing the groove bottom. The first elastic part (2222) abuts against the groove bottom. The movable part (222) can move relative to the mounting groove (211) along the first direction (X) so that the first elastic part (2222) switches between a deformed state and a natural state. When the first elastic part (2222) is in the deformed state, the first opening (2221) is connected to the first channel (210). When the first elastic part (2222) is in the natural state, the first opening (2221) is disconnected from the first channel (210).

7. The sealing assembly according to claim 5, characterized in that, The mounting groove (211) has a groove opening and a groove bottom arranged opposite to each other along the first direction (X). The groove bottom is provided with a second elastic part. The movable part (222) can move relative to the mounting groove (211) along the first direction (X) to press the second elastic part, so that the second elastic part switches between a deformed state and a natural state. When the second elastic part is in the deformed state, the first opening (2221) is connected to the first channel (210). When the second elastic part is in the natural state, the first opening (2221) is disconnected from the first channel (210).

8. The sealing assembly according to any one of claims 2-4, characterized in that, The sealing assembly (2) has a first direction (X), and the groove wall of the mounting groove (211) is provided with a second opening (2111) and a first partition (2112). The second opening (2111) communicates with the first channel (210), and the first partition (2112) and the second opening (2111) are arranged adjacent to each other along the circumference of the mounting groove (211). The second sealing body (22) can rotate relative to the first sealing body (21) about the first direction (X) so that the second opening (2111) communicates with the first opening (2221), or so that the first partition (2112) blocks the first opening (2221). And / or, the movable part (222) is further provided with a second partition part (2223), the second partition part (2223) is disposed adjacent to the first opening (2221) along the circumferential direction of the movable part (222), and the second sealing body (22) is rotatable relative to the first sealing body (21) about the first direction (X) so that the first opening (2221) communicates with the first channel (210), or the second partition part (2223) blocks the first channel (210).

9. The sealing assembly according to any one of claims 1-4, characterized in that, The first sealing body (21) is provided with a connecting groove (213), the connecting groove (213) is arranged around the outer peripheral surface of the first sealing body (21), the connecting groove (213) is connected to the first channel (210), and the part of the first sealing body (21) with the connecting groove (213) is adapted to extend into the battery cell (1).

10. A liquid injection device, characterized in that, include: The sealing assembly as described in any one of claims 1-9.

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