Sealing element and sealing assembly

Abstract

The utility model discloses a sealing element and a sealing assembly, and belongs to the technical field of battery manufacturing, the sealing element is used for sealing a liquid injection hole of a secondary battery, the sealing element has a first direction, the sealing element comprises a main body part, a sealing part and an extension part, the sealing part is connected with the main body part along the first direction, and at least part of the sealing part is used for sealing the liquid injection hole; the extension part is connected to the side, away from the main body part, of the sealing part in the first direction and used for stretching into the liquid injection hole. The extension part capable of extending into the liquid injection hole is arranged on the side, away from the main body part, of the sealing part, so that the gravity center of the sealing part can move downwards, the possibility that the sealing part inclines or even topples over in the sealing process can be reduced, the sealing effect of the sealing part when the liquid injection hole is sealed is improved, and the reliability of the sealing part is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery manufacturing, and particularly relates to a sealing element and a sealing assembly. BACKGROUND

[0002] In the process of formation and capacity grading of a secondary battery, a sealing element is needed to close a liquid injection hole to seal electrolyte in the secondary battery and avoid leakage of the electrolyte.

[0003] However, in the prior art, due to unreasonable structure design of the sealing element, a gap is generated between the sealing element and the secondary battery during sealing, resulting in incomplete sealing and poor sealing effect. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims to provide a secondary battery to solve the technical problem that a gap is generated in the sealing process of the sealing element, and another object of the application is to provide a sealing assembly.

[0005] Technical scheme, the application provides a sealing element for sealing a liquid injection hole of a secondary battery, the sealing element has a first direction, and the sealing element comprises:

[0006] a main body part,

[0007] a sealing part connected with the main body part along the first direction, at least part of the sealing part being used for covering the liquid injection hole;

[0008] an extension part connected to one side of the sealing part away from the main body part along the first direction, the extension part being used for extending into the liquid injection hole.

[0009] In some embodiments, the sealing part comprises:

[0010] a first part located between the main body part and the extension part along the first direction and connected with the main body part, the first part being used for covering the liquid injection hole;

[0011] a second part located between the first part and the extension part along the first direction and connected with the first part and the extension part respectively, the second part being used for extending into the liquid injection hole and abutting against a hole wall of the liquid injection hole.

[0012] In some embodiments, the sealing element has a second direction intersecting with the first direction, the sealing part has elasticity, and the sealing part can be elastically deformed along the second direction.

[0013] In some embodiments, the first portion has a second direction intersecting the first direction, the first portion has a maximum dimension D1 along the second direction, the second portion has a maximum dimension D2 along the second direction, and D1>D2 is satisfied.

[0014] In some embodiments, the first portion has a second direction intersecting the first direction, the second portion has a maximum dimension D2 along the second direction, and the extended portion has a maximum dimension D3 along the second direction, satisfying: D2>D3.

[0015] In some embodiments, the main body portion, the sealing portion and the extension portion are integrally formed.

[0016] In some embodiments, the extension portion has a maximum dimension H1 along the first direction, and the sealing portion has a maximum dimension H2 along the first direction, satisfying: H1>H2.

[0017] Correspondingly, the present application also provides a sealing assembly, comprising: a sealing part as described in any one of the above embodiments, the sealing assembly also comprising: a shell wall, the shell wall having an axial direction, an injection hole being provided through the shell wall along the axial direction, and at least a portion of the sealing portion being located in the injection hole to seal the injection hole.

[0018] In some embodiments, a first accommodating groove connected to the injection hole is provided on the shell wall along the axial direction, the first accommodating groove surrounds the injection hole, and at least a portion of the sealing portion is located in the first accommodating groove to seal the injection hole.

[0019] In some embodiments, the housing wall has a first surface and a second surface that are opposite to each other in the axial direction, the injection hole passes through the first surface and the second surface, the first accommodating groove passes through the second surface, the first accommodating groove has a groove wall that is opposite to the first surface, and the groove wall can be connected to the sealing member to limit the sealing member in the axial direction;

[0020] Wherein, along the axial direction, the sealing portion has a maximum size H2, and there is a maximum distance H3 between the sealing portion and the first surface, satisfying: H3>H2.

[0021] Beneficial Effects: Compared to the prior art, the sealing member provided in the embodiments of the present application comprises a main body, a sealing member, and an extension member. The sealing member is connected to the main body along a first direction, and at least a portion of the sealing member is used to seal the liquid injection hole. The extension member is connected to a side of the sealing member away from the main body along the first direction, and is used to extend into the liquid injection hole. By providing an extension member capable of extending into the liquid injection hole on the side of the sealing member away from the main body, the present application enables the center of gravity of the seal to move downward, thereby reducing the possibility of the seal tilting or even tipping during the sealing process, thereby improving the sealing effect of the seal when sealing the liquid injection hole and enhancing the reliability of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0023] Figure 1 A schematic structural diagram of a sealing member provided in an embodiment of the present application;

[0024] Figure 2 An axonometric view of a seal provided in an embodiment of the present application;

[0025] Figure 3 A schematic diagram of the structure of the sealing assembly provided in this application;

[0026] Figure 4 A cross-sectional view of a sealing assembly provided for this application;

[0027] Figure 5 for Figure 4 Detailed view of the middle frame A;

[0028] Figure numbers, 1000-seal, 1100-main body, 1200-sealing part, 1210-first part, 1220-second part, 1300-extension part, 2000-sealing assembly, 2100-shell wall, 2111-liquid injection hole, 2112-first accommodating groove, 2114-first surface, 2115-second surface. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly specified and specifically limited. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0031] It should also be noted that in the drawings of the embodiments of the present application, the arrows marked X, Y, and O respectively represent the first direction X, the second direction Y, and the axial direction O. The description of the present application introduces the first direction X, the second direction Y, and the axial direction O to more clearly express the relative positional relationship involved in the present application, wherein the first direction X and the second direction Y intersect, rather than being absolute directions. In actual applications, the first direction X, the second direction Y, and the axial direction O can point to any direction in space.

[0032] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application.

[0033] During the process of converting the secondary battery into a different capacity, a sealant 1000 is required to seal the injection hole 2111 to seal the electrolyte inside the secondary battery and prevent the electrolyte from leaking out.

[0034] However, in the prior art, due to the unreasonable structural design of the seal 1000, the seal 1000 may tilt or even fall during the sealing process, and a gap may be generated between the seal 1000 and the secondary battery, resulting in incomplete sealing and poor sealing effect.

[0035] In order to solve the technical problem that the sealing member 1000 may generate gaps during the sealing process, the first embodiment of the present application provides a sealing member 1000, see Figure 1 and Figure 2The sealing member 1000 is used to seal the liquid injection hole 2111 of the secondary battery. The sealing member 1000 has a first direction X. The sealing member 1000 includes a main body 1100, a sealing portion 1200 and an extension portion 1300. The sealing portion 1200 is connected to the main body 1100 along the first direction X. At least a portion of the sealing portion 1200 is used to cover the liquid injection hole 2111; the extension portion 1300 is connected to a side of the sealing portion 1200 away from the main body 1100 along the first direction X. The extension portion 1300 is used to extend into the liquid injection hole 2111.

[0036] In the above-described embodiment, the extension portion 1300 that can extend into the injection hole 2111 can move the center of gravity of the seal 1000 away from the main body 1100 along the first direction X, thereby reducing the probability of incomplete sealing caused by the seal 1000 tilting or tipping over. Specifically, in some embodiments, the first direction X is a direction perpendicular to the horizontal plane, and the main body 1100 is located above the sealing portion 1200. By arranging the extension portion 1300 below the sealing portion 1200, the center of gravity of the seal 1000 is lowered, thereby reducing the probability of the seal 1000 tilting or tipping over, thereby improving the reliability of the seal 1000. In addition, the extension portion 1300 is capable of extending into the injection hole 2111, so as to better lower the center of gravity and improve the reliability of the seal 1000.

[0037] In some embodiments, please refer again to Figure 1 and Figure 2 The sealing portion 1200 includes a first portion 1210 and a second portion 1220. The first portion 1210 is located between the main portion 1100 and the extension portion 1300 along the first direction X, and is connected to the main portion 1100. The first portion 1210 is used to cover the liquid injection hole 2111; the second portion 1220 is located between the first portion 1210 and the extension portion 1300 along the first direction X, and is respectively connected to the first portion 1210 and the extension portion 1300. The second portion 1220 is used to extend into the liquid injection hole 2111 and abut against the hole wall of the liquid injection hole 2111.

[0038] Specifically, the first portion 1210 is used to cover the liquid injection hole 2111, and the second portion 1220 is used to plug the liquid injection hole 2111 and abut against the wall of the liquid injection hole 2111 to block the liquid injection hole 2111. The first portion 1210 and the second portion 1220 are both capable of independently sealing the liquid injection hole 2111. In the above embodiment, the provision of the first portion 1210 and the second portion 1220, each capable of independently sealing the liquid injection hole 2111, further enhances the sealing effect and reliability of the seal 1000. Furthermore, the second portion 1220, capable of extending into the liquid injection hole 2111 and abutting against the wall of the liquid injection hole 2111, also reduces the possibility of the seal 1000 tilting or falling, thereby enhancing the reliability of the seal 1000.

[0039] In some embodiments, please refer again to Figure 1 and Figure 2 The sealing member 1000 has a second direction Y intersecting with the first direction X, the sealing portion 1200 is elastic, and the sealing portion 1200 can generate elastic deformation along the second direction Y.

[0040] Specifically, the sealing portion 1200 is made of one or more of polypropylene (PP), polyethylene (PE), polycarbonate (PC), polystyrene (PS), natural rubber, butyl rubber, styrene-butadiene rubber and silicone rubber.

[0041] In some embodiments, the first portion 1210 is elastic and can be elastically deformed along the second direction Y. Specifically, the first portion 1210 can be compressed from the sidewalls toward the central axis along the second direction Y and can return to its original shape after compression. In other embodiments, the second portion 1220 is elastic and can be elastically deformed along the second direction Y. Specifically, the second portion 1220 can be compressed from the sidewalls toward the central axis along the second direction Y and can return to its original shape after compression.

[0042] In some embodiments, the seal 1000 has a central axis disposed along the first direction X, and the seal 1000 is obtained by rotating a circle around the central axis.

[0043] In some embodiments, the main body 1100 and the sealing portion 1200 are transitioned through an arc surface, that is, the connection between the main body 1100 and the sealing portion 1200 has rounded corners to improve the mechanical properties of the connection between the main body 1100 and the sealing portion 1200, thereby avoiding breakage between the main body 1100 and the sealing portion 1200 when the sealing member 1000 is inserted into the injection hole 2111 or the sealing member 1000 is pulled out from the injection hole 2111.

[0044] In some embodiments, the sealing portion 1200 and the extension portion 1300 are transitioned through an arc surface, that is, the connection between the sealing portion 1200 and the extension portion 1300 is rounded to improve the mechanical properties of the connection between the sealing portion 1200 and the extension portion 1300, thereby avoiding breakage between the sealing portion 1200 and the extension portion 1300 when the sealing portion 1000 is inserted into the injection hole 2111 or the sealing portion 1000 is pulled out from the injection hole 2111.

[0045] In the above embodiment, the elastically deformable sealing portion 1200 can exert pressure on the wall of the liquid injection hole 2111, thereby forming a tighter connection with the wall and achieving a better sealing effect. In actual use, the sealing portion 1200 entering the liquid injection hole 2111 is compressed. The elastic potential energy generated by the compression of the sealing portion 1200 causes the sealing portion 1200 to adhere closely to the wall of the liquid injection hole 2111, thereby sealing the liquid injection hole 2111.

[0046] In some embodiments, the maximum dimension D2 of the second portion 1220 along the second direction Y gradually decreases from the main portion 1100 to the extension portion 1300 to facilitate placement of the second portion 1220 into the liquid injection hole 2111 .

[0047] In some embodiments, at least the second portion 1220 of the sealing portion 1200 is elastic, and the second portion 1220 can generate elastic deformation along the second direction Y, thereby squeezing the hole wall of the injection hole 2111 to produce a better sealing effect.

[0048] In some embodiments, please refer again to Figure 1 The first portion 1210 has a second direction Y intersecting the first direction X, the first portion 1210 has a maximum dimension D1 along the second direction Y, and the second portion 1220 has a maximum dimension D2 along the second direction Y, satisfying: D1>D2.

[0049] In the above embodiment, by setting the maximum dimension of the first part 1210 along the second direction Y to be larger than the maximum dimension of the second part 1220 along the second direction Y, so that the first part 1210 will not enter the injection hole 2111, the sealing area of ​​the first part 1210 can be further expanded, thereby improving the sealing performance of the seal 1000.

[0050] In some embodiments, please refer again to Figure 1 The first portion 1210 has a second direction Y intersecting with the first direction X, the second portion 1220 has a maximum dimension D2 along the second direction Y, and the extension portion 1300 has a maximum dimension D3 along the second direction Y, satisfying: D2>D3.

[0051] In the above embodiment, setting the dimension of the extension portion 1300 along the second direction Y to be smaller than the dimension of the second portion 1220 along the second direction Y can reduce the contact area between the seal 1000 and the wall of the injection hole 2111 when the sealing pin is placed, thereby reducing the friction between the seal 1000 and the wall of the injection hole 2111 and reducing the difficulty of using the seal 1000 to seal the injection hole 2111.

[0052] In some embodiments, see Figure 1 and Figure 2 The main body 1100, the sealing portion 1200 and the extension portion 1300 are integrally formed.

[0053] Since the elastic potential energy generated by the elastic deformation of the sealing part 1200 squeezes the hole wall of the injection hole 2111 to achieve the sealing of the injection hole 2111, it is necessary to overcome the friction between the seal 1000 and the hole wall when placing the seal 1000 into the injection hole 2111 and pulling the seal 1000 out of the injection hole 2111.

[0054] In the above embodiment, the one-piece molded seal 1000 has better mechanical properties and service life, can increase the number of times the seal 1000 overcomes friction and does work, and reduce the probability of fracture and failure between the main body 1100 and the sealing part 1200 and between the sealing part 1200 and the extension part 1300 when the seal 1000 is inserted into the injection hole 2111 and pulled out of the injection hole 2111, thereby further improving the reliability of the seal 1000.

[0055] In some embodiments, please refer again to Figure 1 The extension portion 1300 has a maximum dimension H1 along the first direction X, and the sealing portion 1200 has a maximum dimension H2 along the first direction X, satisfying: H1>H2.

[0056] In the above embodiment, by making the size of the extension portion 1300 along the first direction X larger than the size of the sealing portion 1200 along the first direction X, the volume of the extension portion 1300 can be increased while the size of the extension portion 1300 along the second direction Y remains unchanged, thereby increasing the mass of the extension portion 1300, thereby making the effect of the extension portion 1300 in changing the center of gravity position of the seal 1000 more obvious, thereby further reducing the possibility of the seal 1000 tilting or falling when sealing the liquid injection hole 2111.

[0057] In some embodiments, the main body 1100 has a maximum dimension H4 along the first direction X, satisfying: 5 mm < H4 < 15 mm.

[0058] Specifically, the value of H4 can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, or 15 mm. When the value of H4 is within the range specified in the embodiments of the present application, the main body 1100 can be easily grasped while maintaining a small volume and mass, preventing the seal 1000 from tilting or falling.

[0059] In some embodiments, the main body 1100 has a maximum dimension D4 along the second direction, satisfying: 6 mm < D4 < 10 mm.

[0060] Specifically, the value of D4 can be 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm. When the value of H4 is within the range specified in the embodiments of the present application, the main body 1100 can be easily grasped while maintaining a small volume and mass, preventing the seal 1000 from tilting or falling.

[0061] Accordingly, this application also provides a sealing assembly 2000, see Figure 3 and Figure 4 , including: a seal 1000 as any one of the above embodiments, the sealing assembly 2000 also includes: a shell wall 2100, the shell wall 2100 has an axial direction O, and an injection hole 2111 is provided on the shell wall 2100 along the axial direction O, and at least a part of the sealing part 1200 is located in the injection hole 2111 to seal the injection hole 2111.

[0062] In some embodiments, the shell wall 2100 is a top cover of the secondary battery; in some embodiments, the shell wall 2100 is a bottom wall of the shell of the secondary battery; in some embodiments, the shell wall 2100 is a side wall of the shell of the secondary battery.

[0063] In some embodiments, when the seal 1000 seals the injection hole 2111 , the axial direction O is parallel to the first direction X, that is, when the seal 1000 seals the injection hole 2111 , the main body 1100 is located along the axial direction O on the side of the sealing portion 1200 away from the extension portion 1300 .

[0064] In some embodiments, at least a portion of the sealing portion 1200 is elastic and capable of elastic deformation, allowing it to abut against the wall of the injection hole 2111 after entering the injection hole 2111. Specifically, in some embodiments, the second portion 1220 of the sealing portion 1200 can enter the injection hole 2111 and abut against the wall of the injection hole 2111 after entering the injection hole 2111, thereby blocking the injection hole 2111. Specifically, when not entering the injection hole 2111, the maximum dimension D2 of the second portion 1220 along the second direction Y is greater than the outer diameter of the injection hole 2111, so that the second portion 1220 is in a compressed state after entering the injection hole 2111, thereby abutting against the wall of the injection hole 2111.

[0065] Specifically, at least a portion of the sealing portion 1200 can abut against the wall of the injection hole 2111 along the circumference of the injection hole 2111 to seal the injection hole 2111. Specifically, the second portion 1220 of the sealing portion 1200 is compressed along the second direction Y after entering the injection hole 2111 and can abut against the wall of the hole under the action of elastic potential energy, thereby sealing the injection hole 2111.

[0066] In some embodiments, the housing wall 2100 comprises a first surface 2114 and a second surface 2115 facing away from each other along the axial direction O, the liquid injection hole 2111 penetrates the first surface 2114 and the second surface 2115 along the axial direction O, and at least part of the sealing part 1200 is attached to at least one of the first surface 2114 or the second surface 2115 to cover the liquid injection hole 2111. Specifically, the first part 1210 of the sealing part 1200 is attached to at least one of the first surface 2114 or the second surface 2115 to cover the liquid injection hole 2111. In the case where the housing wall 2100 is part of a secondary battery, the first part 1210 of the sealing part 1200 is attached to the surface of the first surface 2114 or the second surface 2115 facing away from the electrode assembly.

[0067] In the above embodiments, by arranging at least part of the sealing part 1200 at the liquid injection hole 2111 to seal the liquid injection hole 2111, a better sealing effect can be achieved.

[0068] In some embodiments, referring to Figure 4 and Figure 5 , the housing wall 2100 is provided with a first accommodating groove 2112 along the axial direction O, the first accommodating groove 2112 is in communication with the liquid injection hole 2111, the first accommodating groove 2112 surrounds the liquid injection hole 2111, and at least part of the sealing part 1200 is located in the first accommodating groove 2112 to cover the liquid injection hole 2111.

[0069] In some embodiments, the first part 1210 has elasticity and can be elastically deformed along the second direction Y, the maximum dimension of the first accommodating groove 2112 in a direction perpendicular to the axial direction O is smaller than the maximum dimension D1 of the first part 1210 in the second direction Y, the first part 1210 needs to be compressed in the second direction Y when entering the first accommodating groove 2112, and abuts against the housing wall 2100 after entering the first accommodating groove 2112, further increasing the length of the sealing path and limiting the sealing part 1000 in the circumferential direction.

[0070] In the above embodiments, the first accommodating groove 2112 can extend the sealing path of the sealing assembly 2000, improving the sealing effect.

[0071] In some embodiments, referring again to Figure 5The shell wall 2100 has a first surface 2114 and a second surface 2115 that are opposite to each other along the axial direction O, the injection hole 2111 passes through the first surface 2114 and the second surface 2115, the first accommodating groove 2112 passes through the second surface 2115, the first accommodating groove 2112 has a groove wall, the groove wall is opposite to the first surface 2114, and the groove wall can be connected to the seal 1000 to limit the seal 1000 along the axial direction O; wherein, along the axial direction O, the sealing part 1200 has a maximum size H2, and there is a maximum distance H3 between the sealing part 1200 and the first surface 2114, satisfying: H3>H2.

[0072] Specifically, along the axial direction O, the sealing portion 1200 does not extend beyond the plane of the first surface 2114. When the housing wall 2100 is a part of the secondary battery, the sealing portion 1200 does not extend into the accommodating cavity.

[0073] It can be understood that, in some embodiments, the shell wall 2100 is a part of the secondary battery, and a current collecting sheet is further connected to the side of the shell wall 2100 facing the secondary battery receiving cavity.

[0074] In addition, in some embodiments, the maximum dimension D3 of the extension portion 1300 along the second direction Y is smaller than the maximum dimension D2 of the second portion 1220 along the second direction Y, which can also avoid the extension portion 1300 colliding with the current collecting piece when the seal 1000 is inserted into the injection hole 2111, causing the current collecting piece to fall off.

[0075] In the above embodiment, by preventing the sealing portion 1200 from extending into the accommodating cavity, it is possible to prevent the sealing member 1000 from squeezing the current collecting piece connected to the housing wall 2100 facing the accommodating cavity and causing the current collecting piece to become desoldered.

[0076] The above is a detailed introduction to a seal and a sealing assembly provided in the embodiments of the present application. Specific examples are used in this application to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A seal, characterized in that: A sealing member for sealing a liquid injection hole of a secondary battery, wherein the sealing member has a first direction and comprises: Main body, a sealing portion, the sealing portion being connected to the main body portion along the first direction, and at least a portion of the sealing portion being used to seal the liquid injection hole; An extension portion is connected to a side of the sealing portion away from the main body portion along the first direction, and the extension portion is used to extend into the liquid injection hole.

2. The seal according to claim 1, wherein: The sealing portion includes: a first portion, the first portion being located between the main portion and the extension portion along the first direction and connected to the main portion, the first portion being used to cover the liquid injection hole; The second part is located between the first part and the extension part along the first direction and connects the first part and the extension part respectively. The second part is used to extend into the injection hole and abut against the hole wall of the injection hole.

3. The seal according to claim 1, wherein: The sealing member has a second direction intersecting with the first direction, the sealing portion has elasticity, and the sealing portion can generate elastic deformation along the second direction.

4. The seal according to claim 2, characterized in that The first portion has a second direction intersecting the first direction. The first portion has a maximum dimension D1 along the second direction. The second portion has a maximum dimension D2 along the second direction, satisfying: D1>D2.

5. The seal according to claim 2, wherein: The first portion has a second direction intersecting the first direction, the second portion has a maximum dimension D2 along the second direction, and the extended portion has a maximum dimension D3 along the second direction, satisfying: D2>D3.

6. The seal according to claim 1, wherein: The main body, the sealing portion and the extension portion are integrally formed.

7. The seal according to claim 1, wherein: The extension portion has a maximum dimension H1 along the first direction, and the sealing portion has a maximum dimension H2 along the first direction, satisfying: H1>H2.

8. A sealing assembly, characterized in that: include: The seal according to any one of claims 1 to 7, wherein the sealing assembly further comprises: a shell wall, the shell wall having an axial direction, an injection hole being provided through the shell wall along the axial direction, and at least a portion of the sealing portion being located in the injection hole to seal the injection hole.

9. The sealing assembly according to claim 8, wherein: A first accommodating groove communicating with the liquid injection hole is provided on the shell wall along the axial direction. The first accommodating groove surrounds the liquid injection hole. At least a portion of the sealing portion is located in the first accommodating groove to cover the liquid injection hole.

10. The sealing assembly according to claim 9, wherein: The housing wall has a first surface and a second surface that are opposite to each other in the axial direction, the injection hole passes through the first surface and the second surface, the first receiving groove passes through the second surface, the first receiving groove has a groove wall that is opposite to the first surface, and the groove wall can be connected to the sealing member to limit the sealing member in the axial direction; Wherein, along the axial direction, the sealing portion has a maximum size H2, and there is a maximum distance H3 between the sealing portion and the first surface, satisfying: H3>H2.

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