Sealing element

Abstract

The sealing part comprises a shell, a first air bag and a push rod, the shell is provided with an inner cavity, the first air bag is installed on the shell, at least part of the first air bag is located outside the shell and used for stretching into a hole part needing to be sealed, at least part of the push rod is located in the inner cavity, and the push rod can be close to the first air bag in the height direction of the sealing part. The first airbag is expanded and is in interference fit with the side wall of the liquid injection port, so that the risk that the sealing element is separated from the liquid injection port is reduced, the risk that the electrolyte is exposed in a high-humidity environment is further reduced, the performance of the battery cell is improved, and the safety of the battery cell in a processing process and a using process is improved. And the push rod can be far away from the first air bag along the height direction of the sealing element, so that the first air bag shrinks, and the first air bag is released from the side wall of the liquid injection port, so that the sealing element is conveniently taken out from the liquid injection port, and the difficulty of taking down the sealing element from the liquid injection port before secondary liquid injection of the battery cell is reduced.

Description

Technical Field

[0001] This application relates to the field of lithium battery processing technology, and in particular to a sealing element. Background Technology

[0002] The lithium battery manufacturing process requires two separate injections of electrolyte into the cell. After the first injection, the injection port needs to be sealed with rubber nails, and the cell is then transferred to a room where the dew point is not controlled to allow the electrode materials to fully absorb the electrolyte. This ensures that the electrolyte is evenly distributed throughout the battery, promoting the formation of a good solid electrolyte interface film between the electrolyte and the positive and negative electrode materials. This solid electrolyte interface film effectively prevents further decomposition of the electrolyte while allowing lithium ions to pass freely, which is crucial for extending battery life and improving safety.

[0003] If the adhesive pin falls off from the electrolyte filling port during the cell's resting process, the electrolyte will be exposed to a high-humidity environment, affecting cell performance and potentially causing safety issues. To reduce the risk of the adhesive pin falling off, existing adhesive pins are not easily removed while ensuring the filling port remains sealed, increasing the difficulty of removing the adhesive pin before the second electrolyte filling. Utility Model Content

[0004] This application relates to a sealing element that reduces the risk of the sealing element falling off the injection port and also reduces the difficulty of removing the sealing element from the injection port before the second injection.

[0005] This application provides a sealing element, which includes a housing, a first airbag, and a push rod. The housing has an inner cavity, and the first airbag is mounted on the housing. At least a portion of the first airbag is located outside the housing and is used to extend into a hole that needs to be sealed. At least a portion of the push rod is located inside the inner cavity. The push rod can approach the first airbag along the height direction of the sealing element to inflate the first airbag and make it press-fit against the sidewall of the hole to seal the hole. The push rod can also move away from the first airbag along the height direction of the sealing element to contract the first airbag and cancel the sealing of the hole.

[0006] In this application, when the injection port needs to be sealed, the gas inside the inner cavity can enter the first airbag through the first through hole under the action of the push rod. This causes the first airbag to expand and abut against the side wall of the injection port, thereby sealing the injection port. At this time, the first airbag and the side wall of the injection port are interference-fitted, which reduces the risk of the seal separating from the injection port, thereby reducing the risk of electrolyte exposure to a high humidity environment, improving the performance of the battery cell, and enhancing the safety during battery cell processing and use. When it is necessary to remove the seal from the injection port, the push rod can be pushed again, and the gas inside the first airbag can return to the inner cavity through the first through hole, causing the first airbag to contract. The first airbag releases the abutment from the side wall of the injection port, making it easier to remove the seal from the injection port and reducing the difficulty of removing the seal from the injection port before the second electrolyte injection of the battery cell.

[0007] In one possible design, the first airbag includes a first wall, a second wall, and a peripheral wall. The first wall and the second wall are distributed along the height direction of the seal, and the peripheral wall is connected to the first wall and the second wall, respectively. The first wall is connected to the outer shell, and the peripheral wall is elastic and is used to abut against the side wall of the orifice.

[0008] In one possible design, the first airbag also includes a connecting rod located within the space enclosed by the first wall, the second wall, and the peripheral wall, with both ends of the connecting rod connected to the first wall and the second wall, respectively.

[0009] In one possible design, the seal further includes a second airbag located within the inner cavity, along the height direction of the seal, between the push rod and the first airbag, with one end of the push rod abutting against the second airbag; the first airbag has a first through hole, and the second airbag has a second through hole, the first through hole communicating with the second through hole, the push rod being able to compress the second airbag along the height direction of the seal, so that the gas in the second airbag enters the first airbag through the first through hole and the second through hole.

[0010] In one possible design, the outer casing is provided with a first limiting groove and a second limiting groove. The first limiting groove has a first limiting surface, and the second limiting groove has a second limiting surface. The first limiting groove and the second limiting groove are alternately distributed along the circumference of the outer casing. Along the height direction of the seal, the distance between the first limiting surface and the first airbag is less than the distance between the second limiting surface and the first airbag. The push rod is rotatable about the height direction of the seal. The push rod has a limiting part. When the limiting part abuts against the first limiting surface, the first airbag is in an inflated state. When the limiting part abuts against the second limiting surface, the first airbag is in a contracted state.

[0011] In one possible design, a first guide surface is provided between the first limiting groove and the second limiting groove along the circumference of the outer shell, the limiting part abuts against the first guide surface, and the first guide surface can guide the limiting part into the first limiting groove and the second limiting groove; the limiting part has a second guide surface, and the second guide surface abuts against the first guide surface.

[0012] In one possible design, the seal includes a button that is driven to a push rod along the height of the seal. The end of the button away from the push rod is located on the outside of the housing. The button can drive the push rod to move along the height of the seal, and the button can also drive the push rod to rotate about the height of the seal.

[0013] In one possible design, the button has a serrated portion, which includes at least a third guide surface and a fourth guide surface arranged opposite each other along the circumference of the housing, with an included angle greater than zero between the third guide surface and the fourth guide surface; multiple serrated portions are distributed along the circumference of the housing, and the limiting portion has a second guide surface that abuts against the third guide surface or the fourth guide surface; when the button approaches the first airbag along the height direction of the seal, the second guide surface can move along the third guide surface or the fourth guide surface to make the push rod rotate along the height direction of the seal and about the height direction of the seal.

[0014] In one possible design, the push rod includes a first body and a second body. Along the height direction of the seal, the first body is located on the side of the second body away from the first airbag. In the height direction of the seal, the projected area of ​​the first body is larger than the projected area of ​​the second body, and a limiting part is disposed on the first body.

[0015] In one possible design, the seal also includes an elastic element, which is located between the first body and the first airbag along the height direction of the seal; the outer shell is provided with a fixing part, and one end of the elastic element abuts against the first body along the height direction of the seal, and the other end of the elastic element abuts against the fixing part.

[0016] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of the sealing element provided in this application in one embodiment;

[0018] Figure 2 for Figure 1 A partial structural perspective view in one embodiment;

[0019] Figure 3 for Figure 1 Perspective view in another embodiment;

[0020] Figure 4 for Figure 3 A schematic diagram of the structure of the first and second airbags in the middle;

[0021] Figure 5 for Figure 3 A schematic diagram of the structure of the first airbag in one embodiment;

[0022] Figure 6 for Figure 3 An exploded view of the seal in one embodiment;

[0023] Figure 7 for Figure 6 A schematic diagram of the structure of the button in one embodiment;

[0024] Figure 8 for Figure 6 A schematic diagram of the structure of the limiting member in one embodiment;

[0025] Figure 9 for Figure 3 A schematic diagram of the push rod and the second airbag in one embodiment.

[0026] Figure label:

[0027] 1-Outer shell; 11-Inner cavity; 12-Limiting component; 121-First limiting groove; 121a-First limiting surface; 122-Second limiting groove; 122a-Second limiting surface; 123-First guide surface; 124-Slide groove; 13-Fixing part; 14-Boss;

[0028] 2-First airbag; 21-First wall; 211-First through hole; 22-Second wall; 23-Peripheral wall; 24-Connecting rod;

[0029] 3-Push rod; 31-Limiting part; 311-Second guide surface; 32-First body; 33-Second body; 34-Third body;

[0030] 4-Second airbag; 41-Second through hole;

[0031] 5-Button; 51-Operating body; 52-Drive body; 521-Serrated part; 521a-Third guide surface; 521b-Fourth guide surface; 522-Protrusion;

[0032] 6-Elastic element.

[0033] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0034] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0035] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0036] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0037] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0038] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when referring to an element being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element.

[0039] This application provides a sealing element, such as... Figure 1 As shown, the sealing element includes a housing 1, a sealing element mounted on the housing 1, and a push rod 3 mounted on the housing 1. Figure 2 As shown, the outer casing 1 has an inner cavity 11. At least a portion of the first airbag 2 is located outside the outer casing 1 and is used to extend into a hole that needs to be sealed (e.g., the liquid filling port of a lithium battery). At least a portion of the push rod 3 is located inside the inner cavity 11. The push rod 3 can approach the first airbag 2 along the height direction Z of the seal to inflate the first airbag 2 and make it press-fit against the sidewall of the hole to seal the hole. The push rod 3 can also move away from the first airbag 2 along the height direction Z of the seal to contract the first airbag 2 and cancel the sealing of the hole.

[0040] In this embodiment, when a seal is required to seal the injection port, the seal is first inserted into the injection port, and then the push rod 3 is pushed along the height direction Z of the seal, so that the push rod 3 approaches the first airbag 2. Under the action of the push rod 3, the gas in the inner cavity 11 can enter the interior of the first airbag 2 through the first through hole 211 on the first airbag 2, thereby increasing the air pressure inside the first airbag 2 and causing the first airbag 2 to expand. The expanded first airbag 2 can abut against the side wall of the injection port, thereby achieving the sealing of the injection port. At this time, the first airbag 2 and the side wall of the injection port are interference-fitted, thereby reducing the risk of the seal separating from the injection port, thereby reducing the risk of the electrolyte being exposed to a high humidity environment, improving the performance of the battery cell, and improving the safety during the battery cell processing and use.

[0041] When it is necessary to remove the seal from the injection port, the push rod 3 can be pushed again to move the push rod 3 away from the first airbag 2. The gas in the first airbag 2 can return to the inner cavity 11 through the first through hole 211, which reduces the air pressure inside the first airbag 2, thereby causing the first airbag 2 to contract. The first airbag 2 releases its contact with the side wall of the injection port, making it easier to remove the seal from the injection port and reducing the difficulty of removing the seal from the injection port before the second injection of the battery cell.

[0042] like Figure 2 and Figure 5 As shown, the first airbag 2 includes a first wall 21, a second wall 22 and a peripheral wall 23. The first wall 21 and the second wall 22 are distributed along the height direction Z of the seal. The peripheral wall 23 is connected to the first wall 21 and the second wall 22 respectively. The first wall 21 is connected to the outer shell 1. The peripheral wall 23 is elastic and is used to abut against the side wall of the hole.

[0043] In this embodiment, the peripheral wall 23 is made of elastic materials such as rubber and plastic, which reduces the difficulty of the first airbag 2 contracting and expanding, thereby reducing the force required to push the push rod 3 and thus reducing the difficulty of operating the seal.

[0044] like Figure 5 As shown, the first airbag 2 also includes a connecting rod 24, which is located in the space enclosed by the first wall 21, the second wall 22 and the peripheral wall 23. The two ends of the connecting rod 24 are connected to the first wall 21 and the second wall 22 respectively.

[0045] In this embodiment, the first wall 21 and the second wall 22 are fixedly connected by a connecting rod 24. During the process of increasing air pressure inside the first airbag 2, the first connecting rod 24 can reduce the risk of the second wall 22 deforming away from the first wall 21, thereby reducing the risk of the peripheral wall 23 deforming by a small amount or even zero, and thus improving the reliability of the seal of the sealing element to the injection port.

[0046] The elasticity of the first wall 21 and the second wall 22 is lower than that of the peripheral wall 23, so as to facilitate the outward expansion of the peripheral wall 23, thereby improving the reliability of the seal of the sealing component to the injection port.

[0047] Specifically, the first wall 21 is fixedly connected to the outer shell 1 by means of bonding, welding, riveting, etc., to simplify the connection method between the first wall 21 and the outer shell 1. The first wall 21 can be directly connected to the outer shell 1, or a bracket can be fixedly connected to the outer shell 1 by means of bonding, welding, riveting, etc., and the first wall 21 and the bracket can be fixedly connected by means of bonding, welding, riveting, etc. This embodiment of the application does not impose special limitations on the connection method between the first airbag 2 and the outer shell 1.

[0048] In one embodiment, push rod 3 is Figure 2 The structure shown is such that the push rod 3 and the outer shell 1 form a piston structure. The push rod 3 can push the gas in the inner cavity 11 into the first airbag 2 by moving along the height direction Z of the seal.

[0049] In another embodiment, such as Figure 3 As shown, a second airbag 4 is provided inside the inner cavity 11. Along the height direction Z of the seal, the second airbag 4 is located between the push rod 3 and the first airbag 2, and one end of the push rod 3 abuts against the second airbag 4; Figure 4 As shown, the second airbag 4 has a second through hole 41, and the first through hole 211 communicates with the second through hole 41. The push rod 3 can squeeze the second airbag 4 along the height direction Z of the seal so that the gas in the second airbag 4 enters the first airbag 2 through the first through hole 211 and the second through hole 41.

[0050] In this embodiment, as the push rod 3 approaches the first airbag 2 along the height direction Z of the seal, the push rod 3 squeezes the second airbag 4, causing the gas in the second airbag 4 to enter the first airbag 2 through the second through hole 41 and the first through hole 211, thereby causing the pressure in the first airbag 2 to deform, and then causing the peripheral wall 23 of the first airbag 2 to expand outward, so as to seal the injection port.

[0051] In this embodiment, the expansion of the first airbag 2 can be achieved simply by moving the push rod 3 to drive the contraction of the second airbag 4. Figure 2 Compared to the illustrated embodiment, there is no need to consider the seal between the push rod 3 and the housing 1, thereby reducing the difficulty of installing the push rod 3 inside the housing 1. At the same time, the deformation degree of the first airbag 2 can be flexibly adjusted by adjusting parameters such as the size and deformation capability of the second airbag 4, so that the seal can seal injection ports of various sizes, thereby improving the applicability of the seal.

[0052] like Figure 3 , Figure 6 and Figure 8As shown, the outer casing 1 is provided with a first limiting groove 121 and a second limiting groove 122. The first limiting groove 121 has a first limiting surface 121a, and the second limiting groove 122 has a second limiting surface 122a. The first limiting groove 121 and the second limiting groove 122 are alternately distributed along the circumference of the outer casing 1. Along the height direction Z of the seal, the distance between the first limiting surface 121a and the first airbag 2 is less than the distance between the second limiting surface 122a and the first airbag 2. The push rod 3 can rotate around the height direction Z of the seal. The push rod 3 has a limiting part 31. When the limiting part 31 abuts against the first limiting surface 121a, the first airbag 2 is in an inflated state. When the limiting part 31 abuts against the second limiting surface 122a, the first airbag 2 is in a contracted state.

[0053] In this embodiment, the first limiting groove 121 can limit the push rod 3 to the lowest position in the height direction Z of the seal, thereby keeping the first airbag 2 in an inflated state and improving the reliability of the seal of the first airbag 2 to the injection port. The second limiting groove 122 can limit the push rod 3 to the highest position in the height direction Z of the seal, thereby keeping the first airbag 2 in a contracted state, so as to facilitate the removal of the seal from the injection port and the insertion of the seal into the injection port. The first limiting groove 121 and the second limiting groove 122 can improve the stability of the first airbag 2 in the inflated and contracted states, thereby reducing the risk of injection port seal failure caused by changes in the state of the first airbag 2 and the risk of the seal being unable to be inserted into the injection port.

[0054] The first limiting groove 121 and the second limiting groove 122 are distributed along the circumference of the outer shell 1. The switching between the two states can be achieved simply by controlling the rotation of the push rod 3, thereby simplifying the operation of the seal.

[0055] Specifically, the first limiting groove 121 and the second limiting groove 122 can be directly disposed on the side wall of the outer shell 1, that is, the first limiting groove 121 and the outer shell 1, and the second limiting groove 122 and the outer shell 1 are integrally formed, thereby simplifying the structure of the outer shell 1. In another embodiment, such as Figure 3 , Figure 6 and Figure 8 As shown, a limiting member 12 is provided inside the outer shell 1. The first limiting groove 121 and the second limiting groove 122 are both provided in the limiting member 12. The limiting member 12 is fixedly installed inside the outer shell 1 to reduce the processing difficulty of the first limiting groove 121 and the second limiting groove 122.

[0056] like Figure 8 As shown, along the circumference of the outer shell 1, a first guide surface 123 is provided between the first limiting groove 121 and the second limiting groove 122. The limiting part 31 abuts against the first guide surface 123, and the first guide surface 123 can guide the limiting part 31 into the first limiting groove 121 and the second limiting groove 122.

[0057] In this embodiment, the first guide surface 123 can guide the limiting part 31 into the first limiting groove 121 or the second limiting groove 122, reducing the risk that the guide part cannot enter the first limiting groove 121 or the second limiting groove 122, thereby improving the accuracy of the contact between the guide part and the first limiting surface 121a and the second limiting surface 122a.

[0058] The limiting part 31 has a second guide surface 311, which abuts against the first guide surface 123.

[0059] In this embodiment, the limiting part 31 abuts against the first guide surface 123 through the second guide surface 311, which increases the contact area between the limiting part 31 and the first guide surface 123. When the limiting part 31 abuts against the first guide surface 123, the force exerted by the limiting part 31 on the first guide surface 123 is reduced, thereby reducing the risk of damage to the first guide surface 123 under the action of the limiting part 31, and thus extending the service life of the limiting member 12 and the seal.

[0060] Specifically, the first guide surface 123 can be an inclined plane or an arc surface. This embodiment does not impose any special limitation on the outline shape of the first guide surface 123. The second guide surface 311 matches the outline shape of the first guide surface 123. For example, both the first guide surface 123 and the second guide surface 311 are inclined planes with parallel inclination directions, thereby further increasing the contact area between the first guide surface 123 and the second guide surface 311.

[0061] like Figure 1 and Figure 3 As shown, the seal includes a button 5. Along the height direction Z of the seal, the button 5 is driven to connect with the push rod 3. The end of the button 5 away from the push rod 3 is located outside the housing 1. The button 5 can drive the push rod 3 to move along the height direction Z of the seal. The button 5 can also drive the push rod 3 to rotate around the height direction Z of the seal.

[0062] In this embodiment, the push rod 3 is moved and rotated by the button 5, which helps to shorten the length of the push rod 3 in the height direction Z of the seal. This reduces the risk of the push rod 3 breaking or being damaged due to its long length, thereby improving the structural strength of the push rod 3 and extending its service life.

[0063] In one embodiment, the button 5 and the push rod 3 are detachably connected, and there is no relative movement between the button 5 and the push rod 3. That is, the push rod 3 is driven to move by controlling the movement of the button 5 in the height direction Z of the seal, and the push rod 3 is driven to rotate by controlling the rotation of the button 5 around the height direction Z of the seal. This simplifies the structure of the button 5 and the push rod 3 and reduces the cost of the button 5, the push rod 3 and the seal.

[0064] In another embodiment, such as Figure 3 , Figure 6 and Figure 7 As shown, button 5 has a serrated portion 521, which includes at least a third guide surface 521a and a fourth guide surface 521b arranged opposite each other along the circumference of housing 1. The included angle between the third guide surface 521a and the fourth guide surface 521b is greater than zero. Multiple serrated portions 521 are distributed along the circumference of housing 1. Limiting portion 31 has a second guide surface 311, which abuts against the third guide surface 521a or the fourth guide surface 521b. When button 5 approaches the first airbag 2 along the height direction Z of the seal, the second guide surface 311 can move along the third guide surface 521a or the fourth guide surface 521b, so that push rod 3 rotates along the height direction Z of the seal and around the height direction Z of the seal.

[0065] In this embodiment, reference is also made to Figure 7 and Figure 8 When button 5 is pressed, the serrated part 521 abuts against the second guide surface 311, and simultaneously, the fourth guide surface 521b abuts against the second guide surface 311. Driven by button 5, push rod 3 moves downward along the height direction Z of the seal (i.e., closer to the first airbag 2), while the second guide surface 311 moves along the fourth guide surface 521b, causing push rod 3 to rotate around the height direction Z of the seal, so that the second guide surface 311 rotates to below the first guide surface 123. Afterward, push rod 3 is driven to move upward along the height direction Z of the seal (i.e., away from the first airbag 2), and the second guide surface 311 abuts against the fourth guide surface 521b and moves along the fourth guide surface 521b until the limiting part 31 enters the first limiting groove 121 or the second limiting groove 122, thereby limiting push rod 3 to the lowest or highest position by the first limiting surface 121a or the second limiting surface 122a.

[0066] In this embodiment, a serrated part 521 is provided, which allows the push rod 3 to move and rotate simply by pressing the button 5, reducing the operation during the use of the seal and thus reducing the difficulty of using the seal.

[0067] Among them, such as Figure 6 , Figure 7 and Figure 8 As shown, one of the button 5 and the limiting member 12 is provided with a groove 124, and the other is provided with a protrusion 522. The protrusion 522 is located in the groove 124 and abuts against the side wall of the groove 124. During the movement of the button 5 along the height direction Z of the seal, the protrusion 522 can move along the groove 124, thereby improving the accuracy of the movement direction of the button 5.

[0068] In addition, such as Figure 7As shown, button 5 includes an operating body 51 and a driving body 52. ​​A serrated portion 521 and a protrusion 522 are both disposed on the driving body 52. ​​The driving body 52 is located inside the housing 1, and can abut against the housing 1 or the limiting member 12 in the height direction Z of the seal, thereby reducing the risk of button 5 detaching from the housing 1. The operating body 51 protrudes from the outside of the housing 1, and the operator controls the movement of button 5 through the operating body 51, reducing the difficulty of operation for the operator.

[0069] like Figure 3 As shown, the sealing element also includes an elastic element 6. Along the height direction Z of the sealing element, the elastic element 6 is located between the push rod 3 and the first airbag 2. The outer shell 1 is provided with a fixing part 13. Along the height direction Z of the sealing element, one end of the elastic element 6 abuts against the push rod 3, and the other end of the elastic element 6 abuts against the fixing part 13.

[0070] In this embodiment, when the push rod 3 is pressed down by the button 5, the elastic element 6 is compressed and generates a rebound force. When the second guide surface 311 rotates to below the first guide surface 123, the downward pressure on the button 5 and the push rod 3 is released. Under the action of the rebound force of the elastic element 6, the push rod 3 can automatically move upward along the height direction Z of the seal, thereby causing the push rod 3 to automatically move into the first limiting groove 121 or the second limiting groove 122. Therefore, the elastic element 6 further simplifies the operation of the seal during use and reduces the difficulty of using the seal. In addition, the elastic element 6 keeps the limiting part 31 in contact with the first limiting surface 121a and the second limiting surface 122a, reducing the risk that the state of the first airbag 2 will change due to the disengagement of the limiting part 31 from the first limiting surface 121a and the second limiting surface 122a, thereby further improving the stability of the expansion or contraction state of the first airbag 2.

[0071] like Figure 3 As shown, the push rod 3 includes a first body 32 and a second body 33. Along the height direction Z of the seal, the first body 32 is located on the side of the second body 33 away from the first airbag 2. In the height direction Z of the seal, the projected area of ​​the first body 32 is larger than the projected area of ​​the second body 33, and the limiting part 31 is provided on the first body 32.

[0072] In this embodiment, the limiting part 31 is disposed on the first body 32, which increases the setting space of the limiting part 31, thereby increasing the size of the limiting part 31 and facilitating the increase of the number of limiting parts 31, thereby increasing the strength of the limiting part 31 and extending the service life of the push rod 3.

[0073] In one embodiment, push rod 3 is Figure 3 The "T"-shaped structure shown simplifies the structure of push rod 3 and reduces the material and processing costs of push rod 3.

[0074] Among them, such as Figure 3 As shown, the elastic element 6 can be sleeved on the second body 33, with one end of the elastic element 6 abutting against the first body 32 and the other end abutting against the fixing part 13. Sleeving the elastic element 6 on the second body 33 reduces the risk of movement of the elastic element 6 during compression, thereby improving the working stability of the elastic element 6.

[0075] In another embodiment, such as Figure 9 As shown, the push rod 3 also includes a third body 34. Along the height direction Z of the seal, the third body 34 is connected to the side of the second body 33 away from the first body 32, that is, the push rod 3 is... Figure 9 The "I"-shaped structure shown has a third body 34 that abuts against the second airbag 4, which increases the contact area between the push rod 3 and the second airbag 4, reduces the risk of damage to the second airbag 4 under the force of the push rod 3, and thus extends the service life of the second airbag 4 and the seal.

[0076] In any of the above embodiments, such as Figure 1 As shown, a boss 14 is provided on the outer side of the outer shell 1. When the seal is inserted into the liquid injection port, the boss 14 can abut against the surface of the battery cell to limit the insertion depth of the seal. This reduces the risk that the first airbag 2 will detach from the liquid injection port due to a large insertion depth of the seal, thereby improving the reliability of the seal of the liquid injection port.

[0077] In summary, the sealing process of the sealing element provided in this application in one embodiment is as follows:

[0078] When button 5 is pressed down along the height direction Z of the seal, the serrated part 521 of button 5 abuts against the limiting part 31 of push rod 3. At the same time, the fourth guide surface 521b of serrated part 521 abuts against the second guide surface 311 of limiting part 31. As button 5 moves down, the second guide surface 311 moves along the fourth guide surface 521b, causing push rod 3 to move down along the height direction Z of the seal and rotate around the height direction Z of the seal, thereby causing the second guide surface 311 to move below the first guide surface 123 of limiting member 12.

[0079] When the button 5 is released, the elastic element 6 rebounds. Under the push of the elastic element 6, the push rod 3 moves upward along the height direction Z of the seal, causing the second guide surface 311 of the limiting part 31 to abut against the fourth guide surface 521b. Under the push of the rebound force of the elastic element 6, the second guide surface 311 moves along the fourth guide surface 521b, causing the limiting part 31 to enter the first limiting groove 121 until the limiting part 31 abuts against the first limiting surface 121a of the first limiting groove 121. This causes the push rod 3 to be limited to the lowest position in the height direction Z of the seal. At this time, the second airbag 4 is compressed and deformed by the push rod 3. The gas in the second airbag 4 enters the first airbag 2 through the second through hole 41 and the first through hole 211. The pressure in the first airbag 2 increases, causing the peripheral wall 23 of the first airbag 2 to expand outward. Finally, the peripheral wall 23 is press-fitted with the side wall of the injection port, achieving a seal on the injection port.

[0080] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A sealing element, characterized in that, The sealing element includes: The outer shell (1) has an inner cavity (11); A first airbag (2) is mounted on the outer shell (1), at least a portion of which is located outside the outer shell (1) and is used to extend into a hole that needs to be sealed. A push rod (3), at least a portion of which is located within the inner cavity (11), is capable of approaching the first airbag (2) along the height direction (Z) of the seal to inflate the first airbag (2) and press against the sidewall of the hole to seal the hole. The push rod (3) is also capable of moving away from the first airbag (2) along the height direction (Z) of the seal to contract the first airbag (2) and release the seal from the hole.

2. The seal according to claim 1, characterized in that, The first airbag (2) includes a first wall (21), a second wall (22) and a peripheral wall (23). The first wall (21) and the second wall (22) are distributed along the height direction (Z) of the seal. The peripheral wall (23) is connected to the first wall (21) and the second wall (22) respectively. The first wall (21) is connected to the outer shell (1), and the peripheral wall (23) is elastic and is used to abut against the side wall of the hole.

3. The seal according to claim 2, characterized in that, The first airbag (2) also includes a connecting rod, which is located in the space enclosed by the first wall (21), the second wall (22) and the peripheral wall (23), and the two ends of the connecting rod are respectively connected to the first wall (21) and the second wall (22).

4. The seal according to any one of claims 1 to 3, characterized in that, The sealing element also includes a second airbag (4), which is located in the inner cavity (11) along the height direction (Z) of the sealing element. The second airbag (4) is located between the push rod (3) and the first airbag (2), and one end of the push rod (3) abuts against the second airbag (4). The first airbag (2) has a first through hole (211), and the second airbag (4) has a second through hole (41). The first through hole (211) communicates with the second through hole (41). The push rod (3) can squeeze the second airbag (4) along the height direction (Z) of the seal so that the gas in the second airbag (4) enters the first airbag (2) through the first through hole (211) and the second through hole (41).

5. The seal according to any one of claims 1 to 3, characterized in that, The outer shell (1) is provided with a first limiting groove (121) and a second limiting groove (122). The first limiting groove (121) has a first limiting surface (121a), and the second limiting groove (122) has a second limiting surface (122a). The first limiting groove (121) and the second limiting groove (122) are alternately distributed along the circumferential interval of the outer shell (1). Along the height direction (Z) of the seal, the distance between the first limiting surface (121a) and the first airbag (2) is less than the distance between the second limiting surface (122a) and the first airbag (2). The push rod (3) is rotatable about the height direction (Z) of the seal. The push rod (3) has a limiting part (31). When the limiting part (31) abuts against the first limiting surface (121a), the first airbag (2) is in an inflated state. When the limiting part (31) abuts against the second limiting surface (122a), the first airbag (2) is in a contracted state.

6. The seal according to claim 5, characterized in that, Along the circumference of the outer shell (1), a first guide surface (123) is provided between the first limiting groove (121) and the second limiting groove (122), the limiting part (31) abuts against the first guide surface (123), and the first guide surface (123) can guide the limiting part (31) into the first limiting groove (121) and the second limiting groove (122); The limiting part (31) has a second guide surface (311) that abuts against the first guide surface (123).

7. The seal according to claim 5, characterized in that, The seal includes a button (5) along the height direction (Z) of the seal. The button (5) is driven to connect with the push rod (3). The end of the button (5) away from the push rod (3) is located outside the housing (1). The button (5) can drive the push rod (3) to move along the height direction (Z) of the seal. The button (5) can also drive the push rod (3) to rotate around the height direction (Z) of the seal.

8. The seal according to claim 7, characterized in that, The button (5) has a serrated portion (521), the serrated portion (521) including at least a third guide surface (521a) and a fourth guide surface (521b) arranged opposite to each other in the circumference of the housing (1), the included angle between the third guide surface (521a) and the fourth guide surface (521b) being greater than zero; Multiple serrated portions (521) are distributed circumferentially along the outer shell (1). The limiting portion (31) has a second guide surface (311). The second guide surface (311) abuts against the third guide surface (521a) or the fourth guide surface (521b). When the button (5) approaches the first airbag (2) along the height direction (Z) of the seal, the second guide surface (311) can move along the third guide surface (521a) or the fourth guide surface (521b) so that the push rod (3) rotates along the height direction (Z) of the seal and around the height direction (Z) of the seal.

9. The seal according to claim 8, characterized in that, The seal also includes an elastic element (6), which is located between the push rod (3) and the first airbag (2) along the height direction (Z) of the seal. The outer casing (1) is provided with a fixing part (13). Along the height direction (Z) of the seal, one end of the elastic member (6) abuts against the push rod (3), and the other end of the elastic member (6) abuts against the fixing part (13).

10. The seal according to claim 8, characterized in that, The push rod (3) includes a first body (32) and a second body (33). Along the height direction (Z) of the seal, the first body (32) is located on the side of the second body (33) away from the first airbag (2). In the height direction (Z) of the seal, the projected area of ​​the first body (32) is greater than the projected area of ​​the second body (33), and the limiting part (31) is disposed on the first body (32).

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