85A power-assisted sealed lithium electric connector
By designing the 85A power-sealed lithium battery connector with socket, plug and booster rod structure, the operation difficulties and seal failure problems caused by the high plug-in and pull-out force in the existing technology are solved, efficient sealing and convenient plug-in and pull-out, and the stability of the connector and seal life are improved.
Patent Information
- Application Number
- CN202510487206.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2025-08-08
AI Technical Summary
During the frequent plug-in and unplugging of existing lithium battery connectors, excessive plug-in and unplugging force leads to difficulty in operation, increases manual operation strength, and may accelerate the wear of the seal ring, resulting in seal failure.
An 85A power-sealed lithium battery connector is designed, using a socket, plug and power-sealed rod structure. The power-sealed rod drives the plug into or out of the socket. Combined with the design of the seal, it achieves efficient sealing performance and convenient plug-in and unplugging operations, reducing operation difficulty and manual strength.
It achieves efficient sealing performance in complex environments, prevents moisture and dust from intrusion, extends the service life of the seal, and reduces the operating force by 40%-60%.
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Figure CN120453773A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of lithium battery connectors, and in particular to an 85A power-assisted sealed lithium battery connector. Background Art
[0002] The waterproof performance of the connector directly affects the working stability of the equipment in complex environments such as humidity and water immersion, and is therefore related to the safe operation of the entire battery system.
[0003] Conventional connectors primarily rely on multi-layer O-rings or external injection molding to achieve waterproofing. During insertion and removal, sufficient compressive force must be applied between the plug and socket to ensure compression and deformation of the seal, thereby achieving waterproofing. However, excessive insertion and removal force can easily cause operational difficulties, especially during frequent insertion and removal. Excessive resistance can increase manual labor and even accelerate wear of the seal, leading to seal failure.
[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Summary of the Invention
[0005] In view of at least one of the above technical problems, the present application provides an 85A assisted sealed lithium battery connector, which solves the problem in the prior art that the excessive plugging and unplugging force of the connector easily causes operational difficulties, especially in frequent plugging and unplugging scenarios, excessive resistance will increase the intensity of manual operation and even accelerate the wear of the sealing ring, leading to sealing failure.
[0006] This application provides an 85A power-assisted sealed lithium battery connector, comprising:
[0007] The socket has a slot, the socket has a first contact surface, and the first contact surface is provided with a chamfered inner edge at one end close to the opening of the slot;
[0008] The plug is used to mate with the socket, the plug has a second contact surface opposite to the first contact surface, the plug is provided with a plug-in portion that mates with the socket, and the outer side wall of the plug-in portion is provided with a first sealing member that mates with the chamfered inner edge;
[0009] A power lever, which is rotatably connected to the plug and is used to drive the plug into or out of the socket;
[0010] When the plug is inserted into the socket, the first seal fits against the chamfered inner edge, the first seal is compressed, and the first contact surface fits against the second contact surface; when the plug is removed from the socket, the first seal separates from the chamfered inner edge, the first seal expands, and the first contact surface separates from the second contact surface.
[0011] The 85A power-assisted sealed lithium battery connector of this application achieves efficient sealing performance and convenient plugging and unplugging operations through the socket, plug, and power-assisted lever structure. The socket of the socket and the plug's insertion portion fit tightly together, and the provision of the first seal effectively prevents the intrusion of moisture and dust, improving the connector's operational stability in complex environments. Furthermore, the design of the power-assisted lever makes inserting and removing the plug from the socket more labor-efficient, reducing operational difficulty and labor intensity, and extending the service life of the first seal.
[0012] In some possible implementations, the plug-in portion is provided with a receiving groove that cooperates with the first sealing member.
[0013] In some possible implementations, the plug-in portion is provided with a positioning groove, the positioning groove is communicated with the receiving groove, and the first sealing component is provided with a positioning component that cooperates with the positioning groove.
[0014] In some possible implementations, a rotating shaft is provided on an outer side wall of the plug, and a rotating hole that cooperates with the rotating shaft is provided on the power assist rod.
[0015] In some possible implementations, a limit block is provided on the peripheral wall of the rotating shaft, the limit block is spaced apart from the outer side wall of the plug, the power assist rod is provided with a limit hole that cooperates with the limit block, and the limit hole is connected to the rotating hole.
[0016] In some possible implementations, a stop block is provided on an outer side wall of the plug, and a first abutting groove and a second abutting groove respectively matched with the stop block are provided on the power assist rod.
[0017] In some possible implementations, when the plug and the socket are in an initial stage of docking, the stop block is located in the first abutting groove and abuts against the first abutting groove;
[0018] When the plug and the socket are in the locking stage, the stop block is located in the second abutting groove and abuts against the second abutting groove.
[0019] In some possible implementations, a second sealing member that cooperates with the plug-in portion is provided in the slot.
[0020] In some possible implementations, the outer side wall of the plug is provided with a first retaining groove, a travel groove and a second retaining groove, the first retaining groove and the second retaining groove are located on both sides of the travel groove, and the power assist rod is provided with a protrusion, which can respectively cooperate with the first retaining groove, the travel groove and the second retaining groove.
[0021] In some possible implementations, the travel groove is an arc-shaped groove, and the first retaining groove and the second retaining groove are circular grooves.
[0022] The present application is further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0024] Figure 1 A schematic diagram of the structure of the 85A power-assisted sealed lithium battery connector provided in an embodiment of the present application;
[0025] Figure 2 for Figure 1 Schematic diagram of the structure of the middle socket;
[0026] Figure 3 This is a schematic diagram of the structural decomposition of the plug and sealing ring;
[0027] Figure 4 for Figure 3 An enlarged structural diagram of the shift block in FIG.
[0028] Figure 5 for Figure 1 Schematic diagram of the structure of the middle plug;
[0029] In the figure: 100, socket; 110, slot; 120, first contact surface; 130, chamfered inner edge;
[0030] 200, plug; 210, second contact surface; 220, plug-in portion; 230, first sealing member; 240, rotating shaft; 250, shift block;
[0031] 260, first retaining groove; 270, travel groove; 280, second retaining groove;
[0032] 221, receiving groove; 222, positioning groove; 231, positioning member; 241, limiting block;
[0033] 300, power lever; 310, rotation hole; 320, limiting hole; 330, first abutting groove; 340, protrusion; 350, second abutting groove; DETAILED DESCRIPTION
[0034] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.
[0035] like Figures 1 to 5As shown, this embodiment provides an 85A power-assisted sealed lithium battery connector, including: a socket 100, a plug 200 and a power-assisted rod 300.
[0036] Among them, the socket 100 has a slot 110, the socket 100 has a first contact surface 120, and the upper contact surface is provided with a chamfered inner edge 130 near the opening end of the slot 110; the plug 200 is used to be plugged into and matched with the socket 100, the plug 200 has a second contact surface 210 opposite to the first contact surface 120, the plug 200 is provided with a plug-in portion 220 that cooperates with the slot 110, and the outer side wall of the plug-in portion 220 is provided with a first sealing member 230 that cooperates with the chamfered inner edge 130; the power assist rod 300 is rotatably connected to the plug 200, and the power assist rod 300 is used to drive the plug 200 to be inserted into or removed from the socket 100.
[0037] When the plug 200 is inserted into the socket 100, the first seal 230 is in contact with the chamfered inner edge 130, the first seal 230 is compressed, and the first contact surface 120 is in contact with the second contact surface 210; when the plug 200 is removed from the socket 100, the first seal 230 is separated from the chamfered inner edge 130, the first seal 230 is expanded, and the first contact surface 120 is separated from the second contact surface 210.
[0038] More specifically, during the connection process of the 85A power-assisted sealed lithium battery connector in this embodiment, the user manipulates the power-assisted rod 300 to drive the plug 200, so that the plug-in portion 220 gradually enters the slot 110. During the entry process, the first seal 230 first contacts the chamfered inner edge 130 at the opening of the slot 110 and begins to undergo elastic compression. As the plug 200 continues to advance, the first seal 230 is gradually compressed to a preset deformation amount under the action of the chamfered inner edge 130, and eventually the second contact surface 210 of the plug 200 is completely flatly fitted with the first contact surface 120 of the socket 100, forming stable electrical conduction and sealed isolation. When separating, the power-assisted rod 300 is operated in reverse, and the plug-in portion 220 is driven out of the slot 110, and the first seal 230 is unfolded to its natural state due to elastic recovery.
[0039] The 85A power-assisted sealed lithium battery connector of this embodiment achieves efficient sealing performance and convenient plugging and unplugging operations through the structure of the socket 100, plug 200, and power-assisted rod 300. The slot 110 of the socket 100 and the plug-in portion 220 of the plug 200 fit tightly together. In addition, the provision of the first seal 230 effectively prevents the intrusion of moisture and dust, thereby improving the working stability of the connector in complex environments. At the same time, the design of the power-assisted rod 300 makes it easier to insert or remove the plug 200 from the socket 100, reduces the difficulty and labor intensity of the operation, and extends the service life of the sealing ring. The lever transmission mechanism designed with the power-assisted rod 300 converts the linear thrust required for traditional plugging and unplugging into a rotational torque, reducing the operating force by 40%-60%.
[0040] like Figures 1 to 5 As shown, in some embodiments, the plug-in portion 220 is provided with a receiving groove 221 that cooperates with the first sealing member 230 .
[0041] It will be appreciated that the provision of the receiving groove 221 allows the first sealing member 230 to be better secured and positioned when the plug 200 is inserted into or removed from the receptacle 100, thereby enhancing sealing performance. When the plug 200 is inserted into the receptacle 100, the first sealing member 230 is squeezed by the chamfered inner edge 130 of the slot 110, compressing and fitting tightly within the receiving groove 221, forming an effective waterproof and dustproof barrier. When the plug 200 is removed from the receptacle 100, the first sealing member 230 expands with the movement of the plug 200, returning to its original position and preparing for the next insertion and removal operation.
[0042] Furthermore, the design of the receiving groove 221 also allows for easy installation and replacement of the first sealing member 230. The first sealing member 230 is sleeved onto the plug-in portion 220, allowing the user to easily install the first sealing member 230 into the receiving groove 221 or remove it from the receiving groove 221 for replacement, thereby improving the maintainability and service life of the connector.
[0043] like Figures 1 to 5 As shown, in some embodiments, the plug-in portion 220 is provided with a positioning groove 222 , which is communicated with the receiving groove 221 , and the first sealing member 230 is provided with a positioning member 231 that cooperates with the positioning groove 222 .
[0044] It is understood that the coordinated design of the positioning groove 222 and the positioning member 231 ensures the stability and accuracy of the first seal 230 within the receiving groove 221. When the first seal 230 is installed in the receiving groove 221, the positioning member 231 accurately snaps into the positioning groove 222, thereby preventing the first seal 230 from shifting or loosening during insertion and removal. This design not only improves sealing performance but also ensures the stability and reliability of the connector. Furthermore, the coordinated design of the positioning groove 222 and the positioning member 231 makes the installation and replacement of the first seal 230 more convenient and quick, further improving the maintainability and service life of the connector.
[0045] There are multiple positioning grooves 222, which are distributed in pairs. The two positioning grooves 222 are spaced apart and distributed at the same end of the plug-in portion 220, and are located at both ends of the receiving groove 221. It is understood that the two positioning grooves 222 located at the same end of the plug-in portion 220 are arranged along the plugging direction of the plug-in portion 220, and can be arranged in a straight line or staggered, to ensure the stability of the first sealing member 230 in all directions and effectively prevent displacement.
[0046] There are multiple positioning members 231, and the number is the same as the positioning grooves 222. The positioning members 231 are distributed on the first sealing member 230, ensuring that each positioning member 231 precisely matches the corresponding positioning groove 222, forming a multi-point fixation, further enhancing the stability and sealing effect of the first sealing member 230. It is understood that the positioning members 231 are shaped to match the positioning grooves 222 and can be arranged directly opposite the long ends of the first sealing member 230, or they can be arranged offset from the long ends of the first sealing member 230.
[0047] The arrangement of the above positioning members 231 and the positioning grooves 222 ensures that during the plugging and unplugging process, each positioning member 231 can accurately enter the corresponding positioning groove 222, ensuring that the first sealing member 230 always remains stable when the plug 200 is inserted or removed, effectively preventing moisture and dust from entering, and improving the overall performance and durability of the connector.
[0048] like Figures 1 to 5 As shown, in some embodiments, a rotating shaft 240 is provided on the outer wall of the plug 200, and a rotating hole 310 is provided on the power-assisting lever 300 to cooperate with the rotating shaft 240. The rotating shaft 240 cooperates with the rotating hole 310 to connect the power-assisting lever 300 to the plug 200, and the power-assisting lever 300 can rotate around the rotating shaft 240 on the outer wall of the plug 200, thereby driving the plug 200 into or out of the socket 100.
[0049] like Figures 1 to 5 As shown, in some embodiments, a limit block 241 is provided on the peripheral wall of the rotating shaft 240, and the limit block 241 is spaced apart from the outer wall of the plug 200. A limit hole 320 cooperating with the limit block 241 is provided on the power rod 300, and the limit hole 320 is connected to the rotating hole 310.
[0050] Specifically, the stop hole 320 is located near the plug 200. When installing the power-assisting lever 300 into the plug 200, the lever 300 is first rotated to a position such that the stop block 241 can pass through the stop hole 320 and be positioned in the rotation hole 310. As the power-assisting lever 300 rotates relative to the plug 200, the rotating shaft 240 and the stop block 241 on the rotating shaft 240 rotate relative to the rotation hole 310. Simultaneously, the stop block 241 also prevents the rotating shaft 240 from disengaging from the rotation hole 310 along its axis, thereby preventing the power-assisting lever 300 from disengaging from the plug 200.
[0051] Furthermore, the power-assisting rod has a symmetrical structure, and a rotation hole and a limit hole are provided on both the left and right halves of the power-assisting rod. Among them, the rotation hole of the left half of the power-assisting rod and the rotation hole of the right half of the power-assisting rod are coaxially arranged, and the axis is defined as the rotation axis. The limit hole of the left half of the power-assisting rod and the limit hole of the right half of the power-assisting rod are staggered, that is, they extend along different circumferential directions of the rotation axis. Correspondingly, the positions of the limit blocks on the two rotating shafts on different sides are also staggered. With this arrangement, when the power-assisting rod is installed or disassembled, it needs to be installed or disassembled on one side separately, thereby improving the connection stability between the power-assisting rod and the plug.
[0052] like Figures 1 to 5 As shown, in some embodiments, a stop block 250 is provided on the outer side wall of the plug 200 , and a first abutting groove 330 and a second abutting groove 350 respectively cooperating with the stop block 250 are provided on the power lever 300 .
[0053] It can be understood that by setting a stop block 250 on the outer wall of the plug 200 and configuring a first abutment groove 330 or a second abutment groove 350 matching it on the power-assisting rod 300, when the operator drives the power-assisting rod 300 to rotate to realize the connection or separation of the plug 200 and the socket 100, the stop block 250 forms a limiting fit in the first abutment groove 330 or the second abutment groove 350 of the power-assisting rod 300.
[0054] For example, when the power lever rotates and the plug and socket are in the locked position, the stop block abuts the second abutment groove, limiting excessive rotation of the power lever, ensuring that the plug is fully inserted and the first seal reaches a preset compression amount at the chamfered inner edge. For another example, when the power lever rotates in the opposite direction, placing the plug and socket in the initial stage, the stop block abuts the first abutment groove, limiting excessive rotation of the power lever and simultaneously limiting the position of the power lever, allowing it to remain in the initial position, facilitating mating between the plug and socket.
[0055] It can be understood that when the plug and the socket are in the initial stage of docking, the shift block is located in the first abutment groove and abuts against the first abutment groove; when the plug and the socket are in the locking stage, the shift block is located in the second abutment groove and abuts against the second abutment groove.
[0056] like Figures 1 to 5 As shown, in some embodiments, a second sealing member that cooperates with the plug-in portion is provided in the slot.
[0057] It is understandable that the second sealing member is annular and fits snugly against the inner wall of the slot. When the plug and the socket are in the locking stage, the plug-in portion of the plug abuts against the second sealing member, thus forming a seal.
[0058] like Figures 1 to 5As shown, in some embodiments, the outer wall of the plug 200 is provided with a first retaining groove 260, a travel groove 270 and a second retaining groove 280, the first retaining groove 260 and the second retaining groove 280 are located on both sides of the travel groove 270, and the power assist rod 300 is provided with a protrusion 340, which can respectively cooperate with the first retaining groove 260, the travel groove 270 and the second retaining groove 280.
[0059] During the initial mating of the plug 200 and the socket 100, the protrusion 340 engages with the first retaining groove 260, securing the assist lever 300 relative to the plug 200. This facilitates alignment of the plug 200 and the socket 100, eliminating the need for additional support for the assist lever 300 and facilitating operation. By rotating the assist lever 300, the protrusion 340 disengages from the first retaining groove 260 and enters the travel groove 270, where it slides along the travel groove 270. When the plug 200 and the socket 100 are fully assembled, the protrusion 340 disengages from the travel groove 270 and engages with the second retaining groove 280.
[0060] Specifically, the travel groove 270 is an arc-shaped groove, and the first retaining groove 260 and the second retaining groove 280 are circular grooves.
[0061] like Figures 1 to 5 As shown, in some embodiments, the socket 100 is provided with a mating piece, and the booster lever 300 is provided with a sliding groove that slidably cooperates with the mating piece. The sliding groove is partially in the form of an arc-shaped groove. The mating piece on the socket 100 cooperates with the sliding groove of the booster lever 300, making it easier for the booster lever 300 to drive the plug 200 into or out of the socket 100.
[0062] When the plug 200 is mated with the socket 100, the plug 200 is moved so that the mating piece enters the opening of the chute. The power lever 300 is rotated, and the mating piece moves along the chute and away from the opening of the chute. The distance between one end of the power lever 300 and the plug 200 gradually decreases, and the power lever 300 drives the plug 200 into the socket 100.
[0063] When the plug 200 is disengaged from the socket 100, the assist rod 300 is rotated in the opposite direction, and the mating part moves along the slide groove and toward the opening of the slide groove. The distance between one end of the assist rod 300 and the plug 200 gradually increases, and the assist rod 300 drives the plug 200 to disengage from the socket 100.
[0064] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.
[0065] In the description of this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.
[0066] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.
[0067] In the description of this application, it should be understood that 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 at least one of such features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.
[0068] In the embodiments of the present application, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections; direct connections, or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.
[0069] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. Any person skilled in the art can, without departing from the scope of the technical solution of the present application, use the methods and technical contents disclosed above to make many possible changes and modifications to the technical solution of the present application, or modify it into an equivalent embodiment with equivalent changes. Therefore, all equivalent changes made based on the shape, structure and principle of the present application without departing from the content of the technical solution of the present application should be included in the scope of protection of the present application.
Claims
1. An 85A power-assisted sealed lithium battery connector, characterized in that: include: A socket, the socket having a slot, the socket having a first contact surface, and the first contact surface having a chamfered inner edge at one end close to the opening of the slot; a plug, the plug being adapted to engage with the socket, the plug having a second contact surface opposite to the first contact surface, the plug being provided with an inserting portion engaged with the socket, the outer sidewall of the inserting portion being provided with a first sealing member engaged with the chamfered inner edge; A power-assisting rod, the power-assisting rod being rotatably connected to the plug and used to drive the plug to be inserted into or removed from the socket; When the plug is inserted into the socket, the first sealing member is in contact with the inner edge of the chamfer, the first sealing member is compressed, and the first contact surface is in contact with the second contact surface; When the plug is moved out of the socket, the first sealing member is separated from the chamfered inner edge, the first sealing member is unfolded, and the first contact surface is separated from the second contact surface.
2. The 85A power-assisted sealed lithium battery connector according to claim 1, characterized in that: The plug-in portion is provided with a receiving groove that cooperates with the first sealing member.
3. The 85A power-sealed lithium battery connector according to claim 2, characterized in that: The plug-in portion is provided with a positioning groove, the positioning groove is communicated with the receiving groove, and the first sealing component is provided with a positioning component that matches the positioning groove.
4. The 85A power-sealed lithium battery connector according to claim 1, characterized in that: A rotating shaft is provided on the outer side wall of the plug, and a rotating hole matched with the rotating shaft is provided on the power-assisting rod.
5. The 85A power-assisted sealed lithium battery connector according to claim 4, characterized in that: A limiting block is provided on the peripheral wall of the rotating shaft, and the limiting block is spaced apart from the outer side wall of the plug. A limiting hole is provided on the power assist rod to cooperate with the limiting block, and the limiting hole is communicated with the rotating hole.
6. The 85A power-assisted sealed lithium battery connector according to claim 1, characterized in that: A stop block is provided on the outer side wall of the plug, and a first abutting groove and a second abutting groove respectively matched with the stop block are provided on the power rod.
7. The 85A power-assisted sealed lithium battery connector according to claim 6, characterized in that: When the plug and the socket are in the initial stage of docking, the stop block is located in the first abutting groove and abuts against the first abutting groove; When the plug and the socket are in the locking stage, the stop block is located in the second abutting groove and abuts against the second abutting groove.
8. The 85A power-assisted sealed lithium battery connector according to claim 1, characterized in that: A second sealing member cooperating with the plug-in portion is provided in the slot.
9. The 85A power-assisted sealed lithium battery connector according to claim 1, characterized in that: The outer side wall of the plug is provided with a first retaining groove, a travel groove and a second retaining groove, the first retaining groove and the second retaining groove are located on both sides of the travel groove, and the power assist rod is provided with a protrusion, which can respectively cooperate with the first retaining groove, the travel groove and the second retaining groove.
10. The 85A power-assisted sealed lithium battery connector according to claim 9, characterized in that: The travel groove is an arc groove, and the first retaining groove and the second retaining groove are circular grooves.