Joint, energy storage device and vehicle

Abstract

The utility model relates to a connector, an energy storage device and a vehicle. The connector comprises a fixing part. The fixing part is at least used for being fixedly connected with one energy accumulator. The fixing part is provided with a positioning surface; the positioning surface is used for positioning and mounting the fixing part to an opening of the energy accumulator; the positioning surface is inserted into the opening of the energy accumulator. According to the technical scheme, the connector is positioned and installed on the energy accumulator through the opening formed in the positioning surface, accurate positioning of the connector on the energy accumulator is facilitated, more contact parts exist between the energy accumulator and the connector, and the stability of connection between the energy accumulator and the connector is improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage devices, and in particular to a connector, an energy storage device, and a vehicle. Background Art

[0002] An accumulator is an energy storage device installed in a hydraulic or pneumatic system. It can absorb pressure shocks, pulses, etc. when needed and store energy. When the system needs it, it can be used as an energy source to replenish and release the energy required by the system. This type of accumulator is widely used in vehicles and other equipment. The shell of the accumulator used to form a chamber for containing fluid is often provided with an opening for introducing fluid into the chamber or leading out the fluid in the chamber, and a joint is provided at the opening to connect to an external pipe for fluid flow. The joint at the opening of the accumulator is mostly connected to the shell by welding or an integrated method. Among them, in the welding connection method, the end of the joint is often welded to the outer wall of the accumulator shell by gas shielded welding. In this connection method, the joint is only welded to the accumulator through its end, and the connection strength is insufficient. Utility Model Content

[0003] The embodiments of the present application provide a connector, an energy storage device, and a vehicle, which improve the stability of the connection between the connector and the energy accumulator, so as to at least partially solve the above-mentioned technical problems.

[0004] In order to achieve the above object, according to a first aspect of the present application, a joint is provided, comprising:

[0005] A fixing portion, used for combining with the accumulator;

[0006] Wherein, the fixing portion is provided with:

[0007] a positioning surface for positioning the fixing portion to be mounted to the opening of the accumulator;

[0008] When the fixing portion is positioned and mounted to the accumulator, the positioning surface is received in the opening of the accumulator.

[0009] Optionally, the positioning surface is in surface contact with at least a portion of the surface of the inner wall of the energy accumulator forming the opening.

[0010] Optionally, the fixing portion further includes:

[0011] a fixing surface, provided at an end of the fixing portion away from the accumulator;

[0012] When the fixing portion is positioned and mounted on the accumulator, the fixing surface is in contact with an outer wall of the accumulator.

[0013] Optionally, the fixing surface is fixedly connected to the outer wall of the accumulator by vacuum electron beam welding.

[0014] Optionally, the fixing surface is connected to an end of the positioning surface away from the accumulator along a first direction; and the opening of the accumulator at least partially extends along the first direction to communicate with the outer wall and the inner wall of the accumulator.

[0015] Optionally, the connector further comprises:

[0016] A limiting portion, provided at one end of the fixing portion away from the fixing surface along the first direction;

[0017] Wherein, in a second direction perpendicular to or inclined to the first direction, the limiting portion is at least partially protruded from the positioning surface.

[0018] Optionally, the limiting portion protrudes from the positioning surface and forms a first end face at an end close to the positioning surface, and the part of the fixing surface accommodated in the opening of the accumulator forms a second end face at an end away from the limiting portion, and the distance between the first end face and the second end face in the first direction ranges from 6 to 12 mm.

[0019] Optionally, the limiting portion is provided with:

[0020] A limiting surface is provided at one end of the positioning surface away from the fixing surface and is used for contacting the inner wall of the accumulator to prevent the positioning surface from being separated from the opening of the accumulator.

[0021] Optionally, the limiting surface is arranged to protrude from the positioning surface in the second direction.

[0022] Optionally, the length of the limiting surface protruding from the positioning surface in the second direction does not exceed 4 mm.

[0023] Optionally, the limiting portion is further provided with:

[0024] a mating surface disposed at one end of the positioning surface;

[0025] The matching surface at least extends along the second direction and protrudes from the positioning surface.

[0026] Optionally, a minimum distance between the matching surface and the limiting surface in the first direction ranges from 0.10 to 0.45 mm.

[0027] Optionally, the connector further comprises:

[0028] a threaded portion, disposed at an end of the fixing portion away from the accumulator;

[0029] When the joint is coupled to the accumulator, the threaded portion is located outside the accumulator.

[0030] Optionally, the connector further comprises:

[0031] A step portion is provided between the threaded portion and the fixing portion to separate the threaded portion from the fixing portion.

[0032] Optionally, the step portion is provided with:

[0033] A sealing groove is formed on the outer periphery of the step portion and is used for installing a sealing member.

[0034] Optionally, the sealing groove is provided at one end of the step portion close to the threaded portion.

[0035] Optionally, the joint is provided with a through hole, and the through hole passes through the fixing portion, the step portion and the threaded portion.

[0036] According to a second aspect of the present application, there is provided an energy storage device, comprising:

[0037] An accumulator and a joint according to any one of claims 1 to 4;

[0038] The accumulator is provided with a receiving cavity and an opening communicating with the receiving cavity; the positioning surface of the joint is embedded in the opening.

[0039] According to a third aspect of the present application, a vehicle is provided, comprising the joint as described above, or comprising the energy storage device as described above.

[0040] The beneficial effects of the present application are: providing a joint, an energy storage device, and a vehicle that improve connection stability during welding.

[0041] More specifically, some embodiments of the present application may produce the following specific beneficial effects:

[0042] The connector provided in the present application utilizes a positioning surface set into an opening to position the connector and install it on the accumulator, which is beneficial for accurate positioning of the connector on the accumulator, and enables the accumulator and the connector to have more contact parts, thereby improving the stability of the connection between the accumulator and the connector.

[0043] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0045] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0046] Figure 1 is a schematic diagram of the overall structure of the connector provided in an exemplary embodiment of the present application;

[0047] Figure 2 yes Figure 1 A magnified schematic diagram of part A;

[0048] Figure 3 is a schematic structural diagram of an energy storage device provided in an exemplary embodiment of the present application;

[0049] Figure 4 is an exploded view of an energy storage device provided in an exemplary embodiment of the present application;

[0050] Figure 5 2 is a schematic structural diagram of a vehicle provided in an exemplary embodiment of the present application.

[0051] Description of reference numerals:

[0052] 1. Vehicle;

[0053] 10. Energy storage device;

[0054] 100, connector; 100a, perforation;

[0055] 110. Fixing portion; 111. Positioning surface; 112. Fixing surface;

[0056] 120, limiting portion; 121, limiting surface; 122, mating surface;

[0057] 130, threaded portion;

[0058] 140, step portion; 140a, sealing groove; 141, first step surface; 142, first step structure; 143, second step surface; 144, second step structure;

[0059] 200, accumulator; 210, opening; 220, accommodating chamber; 230, rubber diaphragm;

[0060] 300, seals;

[0061] 400, limiter;

[0062] L1, first direction; L2, second direction. DETAILED DESCRIPTION

[0063] 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 creative work are within the scope of protection of the present application.

[0064] According to the first aspect of this application, referring to Figures 1 to 3 As shown, the present application provides a connector 100, which can at least be used as an interface for connecting an external pipeline on an accumulator 200 to allow fluid to enter or exit the accumulator 200. It should be noted that the connector 100 provided in the present application can also be installed on equipment such as water tanks, oil tanks, water pumps, and compressors. Those skilled in the art can assemble the connector 100 on the corresponding equipment according to actual needs, and this is not limited here.

[0065] The connector 100 provided in this application includes a fixing portion 110. The fixing portion 110 can be used to form a fixed connection with at least one accumulator 200. That is, the connector 100 can be assembled onto the accumulator 200 via the fixing portion 110. As an example of a specific connection method, the connector 100 and the accumulator 200 are integrally connected by, for example, welding.

[0066] To enhance the connection strength of connector 100 on equipment such as accumulator 200, the present application provides a positioning surface 111 on fixing portion 110 of connector 100. Positioning surface 111 is used to position fixing portion 110 within opening 210 of accumulator 200. When fixing portion 110 is positioned and installed in accumulator 200, positioning surface 111 is received within opening 210 of accumulator 200, allowing at least a portion of connector 100 to be inserted into the housing of accumulator 200.

[0067] With this solution, when the joint 100 and the accumulator 200 are welded, the positioning surface 111 is set in the opening 210 to assist in positioning the joint 100 on the accumulator 200. The positioning surface 111 can also be used to increase the proportion of the contact portion between the joint 100 and the accumulator 200 to the total surface area of ​​the joint 100, thereby improving the connection strength between the joint 100 and the accumulator 200.

[0068] In some embodiments, the positioning surface 111 is in surface contact with at least a portion of the inner wall of the accumulator 200 forming the opening 210. Figure 3The figure shows the specific mating method between the connector 100 and an accumulator 200. The opening 210 of the accumulator 200 is configured as a cylindrical hole, for example. The positioning surface 111 is configured as a cylindrical surface formed on the connector 100. The positioning surface 111 is inserted into the opening 210 and mates with the inner wall forming the opening 210. The surface contact between the positioning surface 111 and the inner wall forming the opening 210 of the accumulator 200 further enhances the connection strength of the connector on the accumulator 200.

[0069] In some embodiments, the fixing portion 110 further includes a fixing surface 112. The fixing surface 112 is disposed at an end of the fixing portion 110 away from the accumulator 200, i.e., the fixing surface is disposed outside the accumulator 200. When the fixing portion 110 is positioned and mounted on the accumulator 200, the fixing surface 112 abuts against the outer wall of the accumulator 200. When the connector 100 and the accumulator 200 are fixed by welding, the fixing surface 112 is the portion of the connector 100 that is welded to the accumulator 200. The abutment of the fixing surface 112 against the outer wall of the accumulator 200 ensures proper welding.

[0070] It should be noted that the fixing surface 112 is adjacent to the outer wall of the accumulator 200, which can be used to achieve welding fixation between the connector 100 and the accumulator 200. Based on this consideration, the fixing surface 112 is adjacent to the outer wall of the accumulator 200, which includes both the situation where the fixing surface 112 and the accumulator 200 abut against each other and the situation where there is an assembly gap between the connector 100 and the accumulator 200. As long as it can be ensured that the connector 100 and the accumulator 200 can be fixedly combined, it can be used.

[0071] In some embodiments, the fixed surface 112 is fixedly connected to the outer wall of the accumulator 200 by vacuum electron beam welding. Welding the interface on the outside of the accumulator 200 can facilitate the welding operation. Compared with the gas shielded welding commonly used in the field, during vacuum electron beam welding, the cathode in the welding gun emits electrons, and under the action of the magnetic field, a high-speed electron beam is formed to hit the surface of the joint 100 and the accumulator 200. The kinetic energy of the electron beam is converted into heat energy to melt the surface of the joint 100 and the accumulator 200, forming a weld. This welding method has the advantages of precision and high controllability. Welding under vacuum conditions can effectively prevent oxidation of the hot melt surface of the joint 100 and the accumulator 200 during the welding process. The purity of the weld is high, the generation of pores is reduced, and the firmness of the weld of the joint 100 can be effectively guaranteed.

[0072] As a specific embodiment, the opening 210 of the accumulator 200 often extends at least partially along the first direction L1 to connect the inner and outer walls of the accumulator 200, thereby achieving communication between the interior and exterior of the accumulator 200. Based on this, the fixing surface 112 is connected to the end of the positioning surface 111 that is away from the accumulator 200 along the first direction L1. That is, the fixing surface 112 is disposed outside the accumulator 200 shell, and when welding is completed, the fixing surface 112 and the outer wall of the accumulator 200 shell are integrally connected by a weld. It will be understood that this application illustrates the first direction L1 using the structure of the accumulator 200. When the connector 100 is used to connect to other equipment, the first direction L1 can also be considered the direction in which the opening on the other equipment for fluid entry and exit extends. In other words, the fact that the opening 210 of the accumulator 200 extends through the accumulator 200 along the first direction L1 should be considered as a schematic description of the first direction L1, and not the sole limitation of the first direction L1 itself.

[0073] In some embodiments, the connector 100 further includes a stopper 120. The stopper 120 is disposed at one end of the fixing portion 110 away from the fixing surface 112 along the first direction L1. Specifically, a chamber 220 communicating with the opening 210 is formed within the accumulator 200. The chamber 220 can be used to accommodate fluids such as hydraulic oil and compressed gas. The stopper 120 is disposed within the chamber 220 of the accumulator 200. Furthermore, in a second direction L2 perpendicular or oblique to the first direction L1, the stopper 120 at least partially protrudes from the positioning surface 111. Specifically, the second direction L2 can be configured to be perpendicular to the first direction L1. This arrangement allows the inner wall of the accumulator 200 to prevent the stopper 120 from moving outside the chamber 220, facilitating positioning and mounting the connector 100 to the accumulator 200 during welding. Furthermore, the connection strength of the connector 100 can be further enhanced after welding.

[0074] Considering the occupation of the space of the fluid accommodating cavity 220 by the limiting portion 120, Figure 1 As shown, for the first end face of the limiting portion 120 protruding from the positioning surface 111 and formed close to the positioning surface 111, and the second end face of the fixing surface 112 accommodated in the opening 210 of the accumulator 200 and away from the limiting portion 120, the distance h1 between the first end face and the second end face in the first direction L1 is in the range of 6-12 mm, so as to limit the influence of the volume of the joint 100 on the ability of the accumulator 200 to accommodate fluid, and the wall thickness of the limiting portion 120 can also reduce the possibility of the joint 100 and the accumulator 200 being welded through during welding, thereby improving the product yield.

[0075] In some embodiments, the limiting portion 120 is provided with a limiting surface 121. The limiting surface 121 is disposed at the end of the positioning surface 111 away from the fixing surface 112 and is configured to contact the inner wall of the accumulator 200 to prevent the positioning surface 111 from disengaging from the opening 210 of the accumulator 200. By providing the limiting surface 121 to contact the inner wall of the accumulator 200, the relative position of the connector 100 and the accumulator 200 is limited in the first direction L1, further improving the positioning accuracy of the connector 100 and the accumulator 200. In a specific embodiment, the limiting surface 121 is configured to protrude from the positioning surface 111 in the second direction L2, thereby preventing the limiting portion 120 from being removed from the accumulator 200.

[0076] Considering that the inner wall of the accommodating chamber 220 for accommodating fluid formed by the accumulator 200 and other devices is often a curved surface, Figure 2 and Figure 3 As shown, in the present application, the length a of the limiting surface 121 protruding from the positioning surface 111 in the second direction L2 does not exceed 4 mm, so as to limit the size of the gap formed between the limiting surface 121 and the inner wall of the accumulator 200 when the limiting surface 121 contacts the inner wall of the accumulator 200, thereby ensuring the processing accuracy of the contour of the energy storage device 10 composed of at least the accumulator 200 and the joint 100, and also reducing the possibility of being welded through during welding.

[0077] In some embodiments, the stopper 120 further comprises a mating surface 122. The mating surface 122 is disposed at an end of the stopper surface 121 away from the positioning surface 111. The mating surface 122 extends at least along the second direction L2 and protrudes from the positioning surface 111. The provision of the mating surface 122 further ensures that the stopper 120 has sufficient wall thickness in the second direction L2, thereby reducing the possibility of weld penetration.

[0078] When the mating surface 122 is configured, the mating surface 122 and the limiting surface 121 should be spaced apart in the first direction L1 so that the mating surface 122 does not necessarily contact the inner wall of the accumulator 200, thereby reducing the requirements for the contour processing accuracy of the joint 100 and the accumulator 200. However, a large distance between the mating surface 122 and the limiting surface 121 in the first direction L1 will increase the distance between the mating surface 122 and the inner wall of the accumulator 200, resulting in the active structure of the accumulator 200 itself (such as the inner wall) for storing and releasing fluid being larger. Figure 3 The rubber diaphragm 230 shown in the figure is embedded in the gap between the mating surface 122 and the inner wall of the accumulator 200 during the movement, causing the rubber diaphragm 230 to be damaged during the movement. Figure 2As shown, in this application, the minimum distance h2 between the matching surface 122 and the limiting surface 121 in the first direction L1 can be limited to a range of 0.10-0.45 mm, thereby reducing the possibility of damage to the accumulator 200 during use while lowering the requirements for assembly accuracy.

[0079] In some embodiments, the connector 100 further includes a threaded portion 130. The threaded portion 130 is disposed on the end of the fixing portion 110 distal from the accumulator 200. Specifically, when the connector 100 is coupled to the accumulator 200, the threaded portion 130 is located externally of the accumulator 200, allowing the connector 100 to connect to an external pipe or device transporting fluid. The threaded portion 130 may be, for example, an internal or external thread formed on the connector 100.

[0080] In some embodiments, the connector 100 further includes a step portion 140 . The step portion 140 is disposed between the threaded portion 130 and the fixing portion 110 to separate the threaded portion 130 from the fixing portion 110 . This can reduce the negative impact on the threaded portion 130 during welding and ensure the integrity of the threaded portion 130 .

[0081] In some embodiments, the step portion 140 is provided with a sealing groove 140a. The sealing groove 140a is formed on the outer periphery of the step portion 140 and is used to install a sealing member 300 to ensure the sealing between the joint 100 and the external pipe or equipment by installing the sealing member 300. The sealing member 300 can be, for example, a rubber sealing ring. Figure 1 and Figure 2 A stopper 400 may also be provided within the sealing groove 140a. This stopper 400 is embedded in the sealing groove 140a and can be used to limit the position of the sealing member 300, ensuring its stable installation on the step portion 140. The stopper 400 may, for example, be a metal ring with a notch. During use, the metal ring's deformation is utilized to snap the metal ring into the sealing groove 140a through the notch, thereby achieving installation of the stopper 400 within the sealing groove 140a. Those skilled in the art may also adopt other matching forms of the stopper 400 and the sealing member 300, depending on actual circumstances, and this is not a limitation herein.

[0082] The sealing groove 140 a is provided at one end of the step portion 140 close to the threaded portion 130 , which reduces the possibility of damage to the sealing groove 140 a during welding and ensures the sealing between the joint 100 and the external pipe during subsequent use.

[0083] In a specific embodiment, the step portion 140 includes a first step surface 141 and a second step surface 143. The first step surface 141 is located at the end of the step portion 140 closest to the fixing portion 110 and is spaced apart from the end surface of the fixing portion 110. More specifically, the first step surface 141 is spaced apart from the fixing surface 112, thereby forming a first step structure 142 between the fixing surface 112 and the first step surface 141. The first step structure 142 can be used as a fixture to position and clamp the joint 100 and accumulator 200 after welding. The second step surface 143 is located at the end of the first step surface 141 away from the fixing portion 110 and is spaced apart from the first step surface 141, thereby forming a second step structure 144 between the two. The second step structure 144 can be used to separate the threaded portion 130 from the fixing portion 110, thereby ensuring sufficient spacing between the threaded portion 130 and the fixing portion 110. At the same time, the threaded portion 130 can be separated from the first step structure 142 to prevent the threaded portion 130 from being accidentally damaged when an external clamp clamps the first step structure 142 .

[0084] In a specific solution, the connector 100 is provided with a through-hole 100a, which passes through the fixing portion 110, the step portion 140 and the threaded portion 130. The through-hole 100a is further connected to the accommodating cavity 220, so that the fluid can be transported inside and outside the accommodating cavity 220 by utilizing the through-hole 100a. The extension direction of the through-hole 100a can be flexibly configured according to the relative positions of the pipeline and the accumulator 200, for example, extending along the first direction L1.

[0085] According to the second aspect of this application, referring to Figure 3 and Figure 4 As shown, an energy storage device 10 is provided, comprising an accumulator 200 and the aforementioned connector 100. The accumulator 200 has a fluid-holding cavity 220 and an opening 210 communicating with the cavity 220. The positioning surface 111 of the connector 100 is embedded in the opening 210. By improving the connection between the connector 100 and the accumulator 200, the stability of the connection between the two is enhanced, thereby improving the structural strength of the energy storage device 10.

[0086] It should be noted that other structures of the accumulator 200 are not the focus of improvement in this application. Those skilled in the art can flexibly configure them according to actual needs, and they will not be described in detail here.

[0087] According to the third aspect of this application, referring to Figure 5 As shown, a vehicle 1 is also provided, comprising the above-mentioned connector 100, or comprising the above-mentioned energy storage device 10. The vehicle 1 has all the beneficial effects of the above-mentioned connector 100 or the above-mentioned energy storage device 10, which will not be described in detail in this application.

[0088] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0089] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0090] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other unless there is any conflict.

[0091] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A joint (100), characterized in that: include: A fixing portion (110) for combining with the accumulator (200); Wherein, the fixing portion (110) is provided with: a positioning surface (111) for positioning the fixing portion (110) to be mounted on the opening (210) of the accumulator (200); When the fixing portion (110) is positioned and mounted on the accumulator (200), the positioning surface (111) is accommodated in the opening (210) of the accumulator (200).

2. The joint (100) according to claim 1, characterized in that The positioning surface (111) is in surface contact with at least a portion of the inner wall of the energy accumulator (200) forming the opening (210).

3. The joint (100) according to claim 2, characterized in that The fixing portion (110) further includes: a fixing surface (112) provided at an end of the fixing portion (110) away from the accumulator (200); When the fixing portion (110) is positioned and mounted on the accumulator (200), the fixing surface (112) is adjacent to the outer wall of the accumulator (200).

4. The joint (100) according to claim 3, characterized in that The fixing surface (112) and the outer wall of the accumulator (200) are fixedly connected by vacuum electron beam welding.

5. The joint (100) according to claim 3, characterized in that The fixing surface (112) is connected to one end of the positioning surface (111) away from the accumulator (200) along a first direction (L1); the opening (210) of the accumulator (200) at least partially extends along the first direction (L1) to communicate with the outer wall and the inner wall of the accumulator (200).

6. The joint (100) according to claim 5, characterized in that Also includes: a limiting portion (120) disposed at one end of the fixing portion (110) away from the fixing surface (112) along the first direction (L1); Wherein, in a second direction (L2) perpendicular to or inclined to the first direction (L1), the limiting portion (120) is at least partially protruded from the positioning surface (111).

7. The joint (100) according to claim 6, characterized in that The limiting portion (120) protrudes from the positioning surface (111) and forms a first end face at an end close to the positioning surface (111); a portion of the fixing surface (112) accommodated in the opening (210) of the accumulator (200) forms a second end face at an end away from the limiting portion (120); and a distance between the first end face and the second end face in the first direction (L1) ranges from 6 mm to 12 mm.

8. The joint (100) according to claim 6, characterized in that The limiting portion (120) is provided with: A limiting surface (121) is provided at one end of the positioning surface (111) away from the fixing surface (112) and is used for contacting the inner wall of the accumulator (200) to prevent the positioning surface (111) from being separated from the opening (210) of the accumulator (200).

9. The joint (100) according to claim 8, characterized in that The limiting surface (121) is arranged to protrude from the positioning surface (111) in the second direction (L2).

10. The joint (100) according to claim 9, characterized in that The length of the limiting surface (121) protruding from the positioning surface (111) in the second direction (L2) does not exceed 4 mm.

11. The joint (100) according to claim 6, characterized in that The limiting portion (120) is further provided with: A matching surface (122) is provided at an end of the limiting surface (121) away from the positioning surface (111); Wherein, the matching surface (122) extends at least along the second direction (L2) and protrudes from the positioning surface (111).

12. The joint (100) according to claim 11, characterized in that The minimum distance between the matching surface (122) and the limiting surface (121) in the first direction (L1) ranges from 0.10 to 0.45 mm.

13. The joint (100) according to any one of claims 1 to 12, characterized in that: Also includes: a threaded portion (130) disposed at an end of the fixing portion (110) away from the accumulator (200); When the joint (100) is coupled to the accumulator (200), the threaded portion (130) is located outside the accumulator (200).

14. The joint (100) according to claim 13, characterized in that Also includes: A step portion (140) is provided between the threaded portion (130) and the fixing portion (110) to separate the threaded portion (130) and the fixing portion (110).

15. The joint (100) according to claim 14, characterized in that The step portion (140) is provided with: A sealing groove (140a) is formed on the outer periphery of the step portion (140) and is used for installing a sealing member (300).

16. The joint (100) according to claim 15, characterized in that The sealing groove (140a) is provided at one end of the step portion (140) close to the threaded portion (130).

17. The connector (100) according to claim 14, characterized in that The joint (100) is provided with a through hole (100a), and the through hole (100a) passes through the fixing portion (110), the step portion (140) and the threaded portion (130).

18. An energy storage device (10), characterized in that include: An accumulator (200) and a joint (100) according to any one of claims 1 to 17; The accumulator (200) is provided with a receiving cavity (220) and an opening (210) communicating with the receiving cavity (220); and the positioning surface (111) of the joint (100) is embedded in the opening.

19. A vehicle (1), characterized in that It comprises the joint (100) according to any one of claims 1 to 17, or comprises the energy storage device (10) according to claim 18.

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