Lithium battery charging protection structure

Abstract

The utility model discloses a lithium battery charging protection structure, which relates to the technical field of lithium battery charging structures and comprises a charging head, a power connection assembly and a locking assembly, the power connection assembly comprises a charging unit, a power-off unit and a reset unit. When the charging unit and the charger plug are separated through the power-off unit, the charging unit is unlocked through the locking assembly, and the charging unit in the contraction state is secondarily locked. When the charger plug is separated from the butt joint socket, automatic reset of the charging unit is realized through the reset unit. By arranging the power connection assembly and the locking assembly, after the lithium battery is charged, the power connection column is separated from the charger plug, the safety of the lithium battery after charging is effectively improved, meanwhile, after the charger plug is separated from the butt joint socket, the power connection column can automatically reset to the initial position, subsequent secondary charging is facilitated, and the safety of the lithium battery is improved. The whole operation is simple and convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery charging structures, and specifically relates to a lithium battery charging protection structure. Background Art

[0002] A lithium battery is a type of battery with a lithium metal or lithium alloy as the negative electrode material and using a non-aqueous electrolyte solution. Existing lithium batteries are equipped with a battery protection board. The lithium battery protection board is mainly an integrated circuit board that protects rechargeable batteries (generally referring to lithium batteries). The lithium battery protection board can achieve overcharge protection, over-discharge protection, over-current protection, and short-circuit protection for lithium batteries.

[0003] During the actual charging process of lithium batteries, although there is double overcharge protection by the lithium battery protection board and the charger, after the lithium battery is fully charged, the charger is not unplugged in time, and the charger and the charging head of the lithium battery still remain plugged in. Thus, there are still certain potential safety hazards. Based on this, a lithium battery charging protection structure is provided. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a lithium battery charging protection structure to solve the problems in the above background.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A lithium battery charging protection structure includes a charging head composed of a docking socket and a foolproof convex block. The foolproof convex block is fixed at the bottom of the inner wall of the docking socket. A storage groove and a side-inverted F-shaped sliding groove are opened inside the foolproof convex block. The side-inverted F-shaped sliding groove is distributed at one end of the storage groove and communicates with the storage groove. The top of the side-inverted F-shaped sliding groove penetrates through the top of the foolproof convex block, and the end of the side-inverted F-shaped sliding groove away from the storage groove penetrates to the outer end of the foolproof convex block. A power connection component is arranged inside the docking socket, and a locking component extending into and outside the docking socket is arranged inside the storage groove and the side-inverted F-shaped sliding groove;

[0006] The power connection component includes a charging unit, a power-off unit, and a reset unit;

[0007] The locking component is used to limit the charging unit when the charger plug is inserted into the charging unit;

[0008] When the charging unit and the charger plug are separated by the power-off unit, the locking component unlocks the charging unit and secondarily locks the contracted charging unit;

[0009] When the charger plug is separated from the docking socket, the locking component releases the lock on the contracted charging unit, and the reset unit realizes the automatic reset of the charging unit.

[0010] As a further solution of the utility model: the charging unit includes a sliding seat and a power connection post;

[0011] The sliding seat is horizontally and slidably installed inside the docking socket and sleeved on the outside of the anti-fooling convex block. The power connection post is installed inside the sliding seat and protrudes from both ends of the sliding seat. One end of the power connection post away from the opening of the docking socket penetrates through the outside of the docking socket through a wire and is electrically connected to the lithium battery;

[0012] The charging operation of the lithium battery is realized by inserting the charger plug into the docking socket and plugging it into the power connection post.

[0013] As a further solution of the utility model: the power-off unit includes a magnetic metal sheet and an electromagnet;

[0014] The electromagnet is fixed at one end of the inner wall of the docking socket. The magnetic metal sheet is fixed at one end of the sliding seat close to the electromagnet and is aligned with the electromagnet. The electromagnet is electrically connected to the lithium battery and the lithium battery protection board through a wire and a controller;

[0015] After the lithium battery is fully charged, the lithium battery protection board sends a signal to the controller. The controller connects the circuit of the electromagnet and the lithium battery. The electromagnet generates magnetic attraction after being powered on to adsorb the magnetic metal sheet, realizing the contraction and movement of the sliding seat and the power connection post and separating them from the charger plug.

[0016] As a further solution of the utility model: the locking assembly includes an L-shaped slider, an extrusion convex block, a straight groove, a first W-shaped elastic sheet, a convex-shaped limiting block, a second W-shaped elastic sheet, an extrusion column, and an external force receiving block;

[0017] The L-shaped slider is horizontally and slidably connected inside the side-reversed F-shaped sliding groove. The vertical part of the L-shaped slider protrudes into the docking socket through a vertical groove of the side-reversed F-shaped sliding groove and is located between the electromagnet and the through groove. The extrusion convex block is fixed at the top of the horizontal part of the L-shaped slider. The straight groove penetrates through the horizontal part of the L-shaped slider and the upper and lower ends of the extrusion convex block;

[0018] The first W-shaped elastic sheet is located inside the straight groove and fits against the bottom of the inner wall of the side-reversed F-shaped sliding groove. The convex-shaped limiting block is fixed at the bottom of the first W-shaped elastic sheet and protrudes into the docking socket through another vertical groove of the side-reversed F-shaped sliding groove and is located at one end of the sliding seat;

[0019] The second W-shaped elastic sheets are distributed between the end faces of the inner wall of the side-reversed F-shaped sliding groove and the end face of the vertical part of the L-shaped slider. The extrusion column is horizontally and slidably connected inside the side-reversed F-shaped sliding groove and fits against one end of the horizontal part of the L-shaped slider. The other end of the extrusion column penetrates through the side-reversed F-shaped sliding groove and the storage groove to the outside of the docking socket and is fixedly connected to the external force receiving block;

[0020] When the charger plug is inserted into the docking socket, it exerts force on the external force block, causing the extrusion column, L-shaped slider, and extrusion bump to move. When the extrusion bump moves above the first W-shaped elastic piece, the first W-shaped elastic piece cannot move downward, which is used to limit the movement of the sliding seat.

[0021] As a further solution of the present utility model: when the electromagnet is electrified to generate magnetic suction force to adsorb the magnetic metal sheet, the L-shaped slider is synchronously adsorbed and moved backward, which is used to realize the continuous movement of the extrusion bump to relieve the extrusion on the convex limit block;

[0022] One end of the top of the convex limit block close to the sliding seat is in an arc surface structure, and the end far from the sliding seat is in a vertical surface structure;

[0023] The sliding seat can squeeze the arc surface of the convex limit block to make it contract, and the vertical surface structure of the convex limit block can realize the limit locking of the contracted sliding seat.

[0024] As a further solution of the present utility model: the reset unit includes a reset spring and a through slot, and the locking component further includes an unlocking pressure block;

[0025] The reset springs are distributed between the sliding seat and the inner wall end face of the docking socket and are symmetrically arranged in two groups. The reset springs are used to provide a reset thrust for the contracted and moved-back sliding seat;

[0026] The through slot is opened at one end of the sliding seat and penetrates through both ends of the sliding seat and the magnetic metal sheet. The through slot is aligned with the vertical part of the L-shaped slider in the horizontal direction;

[0027] When the magnetic metal sheet is adsorbed by the electromagnet, the through slot is used to avoid squeezing and blocking the L-shaped slider;

[0028] The unlocking pressure block is fixed to one end of the vertical part of the L-shaped slider close to the convex limit block. After the charger plug is removed from the docking socket, the L-shaped slider resets to the initial position and forms an extrusion on the convex limit block through the unlocking pressure block to make it move downward, which is used to release the locking of the contracted and moved-back sliding seat.

[0029] Compared with the prior art, the beneficial effects of the present utility model are:

[0030] By setting the power connection component and the locking component, after the lithium battery is fully charged, the power connection column is separated from the charger plug, effectively improving the safety after the lithium battery is fully charged. At the same time, after the charger plug is separated from the docking socket, the power connection column can automatically reset to the initial position, facilitating subsequent secondary charging. The overall operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present utility model;

[0032] Figure 2 The structural cross-sectional view of the charger head of the present utility model;

[0033] Figure 3 The structural cross-sectional view of the charger head of the present utility model and the power connection component;

[0034] Figure 4 The disassembled schematic diagram of the locking component of the present utility model.

[0035] In the figure: 1. Charger head; 101. Docking socket; 102. Anti-fooling bump; 103. Storage groove; 104. Side-inverted F-shaped sliding groove; 2. Power connection component; 201. Sliding seat; 202. Power connection post; 203. Return spring; 204. Magnetic attraction metal sheet; 205. Through notch; 206. Electromagnet; 3. Locking component; 301. L-shaped slider; 302. Extrusion bump; 303. Straight notch; 304. Unlock pressing block; 305. First W-shaped elastic sheet; 306. Convex-shaped limiting block; 307. Second W-shaped elastic sheet; 308. Extrusion post; 309. External force receiving block. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0037] Please refer to Figures 1 to 4 , in the embodiment of the present utility model, a lithium battery charging protection structure includes a charger head 1 composed of a docking socket 101 and an anti-fooling bump 102. The anti-fooling bump 102 is fixed to the bottom of the inner wall of the docking socket 101. A storage groove 103 and a side-inverted F-shaped sliding groove 104 are provided inside the anti-fooling bump 102. The side-inverted F-shaped sliding groove 104 is distributed at one end of the storage groove 103 and communicates with the storage groove 103. The top of the side-inverted F-shaped sliding groove 104 penetrates through the top of the anti-fooling bump 102, and the end of the side-inverted F-shaped sliding groove 104 far from the storage groove 103 penetrates to the outer end of the anti-fooling bump 102. A power connection component 2 is provided inside the docking socket 101, and a locking component 3 extending inside and outside the docking socket 101 is provided inside the storage groove 103 and the side-inverted F-shaped sliding groove 104;

[0038] The power connection assembly 2 includes a charging unit, a power-off unit, and a reset unit. The locking assembly 3 is used to limit the charging unit when the charger plug is inserted into the charging unit. When the charging unit and the charger plug are separated by the power-off unit, the locking assembly 3 unlocks the charging unit and secondarily locks the charging unit in the retracted state. When the charger plug is separated from the docking socket 101, the locking of the retracted charging unit is released by the locking assembly 3, and the automatic reset of the charging unit is achieved through the reset unit;

[0039] The charging unit includes a sliding seat 201 and a power connection post 202;

[0040] The sliding seat 201 is horizontally slidably installed inside the docking socket 101 and is sleeved on the outside of the anti-fooling projection 102. The power connection post 202 is installed inside the sliding seat 201 and protrudes from both ends of the sliding seat 201. One end of the power connection post 202 away from the opening of the docking socket 101 penetrates through the outside of the docking socket 101 through a wire and is electrically connected to the lithium battery;

[0041] Inserting the charger plug into the docking socket 101 and plugging it into the power connection post 202 is used to realize the charging operation of the lithium battery;

[0042] The power-off unit includes a magnetic metal sheet 204 and an electromagnet 206;

[0043] The electromagnet 206 is fixed to one end of the inner wall of the docking socket 101. The magnetic metal sheet 204 is fixed to one end of the sliding seat 201 close to the electromagnet 206 and is aligned with the electromagnet 206. The electromagnet 206 is electrically connected to the lithium battery and the lithium battery protection board through a wire and a controller;

[0044] After the lithium battery is fully charged, the lithium battery protection board sends it to the controller. The controller connects the circuit of the electromagnet 206 and the lithium battery, and generates a magnetic attraction force through the energization of the electromagnet 206 to adsorb the magnetic metal sheet 204, realizing the contraction movement of the sliding seat 201 and the power connection post 202 and separating them from the charger plug;

[0045] The locking assembly 3 includes an L-shaped slider 301, an extrusion projection 302, a straight slot 303, a first W-shaped elastic sheet 305, a convex-shaped limit block 306, a second W-shaped elastic sheet 307, an extrusion post 308, and an external force block 309;

[0046] The L-shaped slider 301 is horizontally slidably connected to the inside of the side-reversed F-shaped chute 104, and the vertical part of the L-shaped slider 301 protrudes into the docking socket 101 through a vertical slot of the side-reversed F-shaped chute 104 and is located between the electromagnet 206 and the through slot 205. The extrusion projection 302 is fixed to the top of the horizontal part of the L-shaped slider 301, and the straight slot 303 penetrates through the upper and lower ends of the horizontal part of the L-shaped slider 301 and the extrusion projection 302;

[0047] The first W-shaped elastic piece 305 is located inside the straight notch 303 and fits against the bottom of the inner wall of the side-inverted F-shaped sliding groove 104. The convex-shaped limiting block 306 is fixed to the bottom of the first W-shaped elastic piece 305 and protrudes into the docking socket 101 through the other vertical notch of the side-inverted F-shaped sliding groove 104, and is located at one end of the sliding seat 201.

[0048] The second W-shaped elastic piece 307 is distributed between the end face of the inner wall of the side-inverted F-shaped sliding groove 104 and the end face of the vertical part of the L-shaped slider 301. The extrusion column 308 is horizontally slidably connected to the inside of the side-inverted F-shaped sliding groove 104 and fits against one end of the horizontal part of the L-shaped slider 301. The other end of the extrusion column 308 penetrates through the side-inverted F-shaped sliding groove 104 and the storage groove 103 to the outside of the docking socket 101 and is fixedly connected to the external force receiving block 309.

[0049] When the charger plug is inserted into the docking socket 101, it squeezes the external force receiving block 309, causing the extrusion column 308, the L-shaped slider 301, and the extrusion convex block 302 to move. By moving the extrusion convex block 302 above the first W-shaped elastic piece 305, the first W-shaped elastic piece 305 cannot move downward, which is used to limit the movement of the sliding seat 201.

[0050] When the magnet 206 is electrified to generate a magnetic attraction force to adsorb the magnetic attraction metal piece 204, the L-shaped slider 301 is synchronously adsorbed and moved backward, which is used to enable the extrusion convex block 302 to continue to move to relieve the extrusion on the convex-shaped limiting block 306.

[0051] One end of the top of the convex-shaped limiting block 306 close to the sliding seat 201 has an arc surface structure, and the end far from the sliding seat 201 has a vertical surface structure.

[0052] The sliding seat 201 can squeeze the arc surface of the convex-shaped limiting block 306 to make it contract, and the vertical surface structure of the convex-shaped limiting block 306 can limit and lock the contracted sliding seat 201.

[0053] In this embodiment: It should be noted that: The charging head 1 is installed inside the lithium battery box, and the opening of the docking socket 101 is located outside the lithium battery box (the fixed structure of the docking socket 101 and the lithium battery box is an existing structure and is not shown in the figure). The charger plug is formed with an anti-fooling groove matching the anti-fooling convex block 102.

[0054] When the charger plug is inserted into the docking socket 101, the outer edge of the charger plug will contact the external force receiving block 309 and apply an extrusion force to it, causing the external force receiving block 309 to move and be received inside the receiving groove 103. At the same time, the external force receiving block 309 squeezes the L-shaped slider 301 to move through the extrusion post 308. The movement of the L-shaped slider 301 drives the extrusion bump 302 to move to the bottom of the convex-shaped limiting block 306, making the convex-shaped limiting block 306 unable to move downward. The top of the convex-shaped limiting block 306 protrudes above the anti-fooling bump 102 and fits against the end face of the sliding seat 201, thereby realizing the movement limit of the sliding seat 201. When the charger plug is inserted into the power connection post 202, the sliding seat 201 can maintain a stable and immobile state, thus ensuring stable charging;

[0055] When the lithium battery is fully charged, the lithium battery protection board sends a signal to the controller. The controller controls the connection of the circuit between the electromagnet 206 and the lithium battery, enabling the electromagnet 206 to be energized to generate a magnetic attraction force and attract the magnetic adsorption metal sheet 204 and the L-shaped slider 301 (it should be noted that the L-shaped slider 301 is also made of a metal material and can be attracted by the magnetic attraction force like the magnetic adsorption metal sheet 204);

[0056] At this time, the L-shaped slider 301 is attracted and moves again to fit against the electromagnet 206. The extrusion bump 302 moves through the lower part of the convex-shaped limiting block 306 and is in a misaligned state with it, enabling the convex-shaped limiting block 306 to have a downward movement space. At the same time, the magnetic adsorption metal sheet 204 is attracted to drive the sliding seat 201 and the power connection post 202 to move synchronously. The sliding seat 201 squeezes the arc surface of the convex-shaped limiting block 306, causing the convex-shaped limiting block 306 to move downward and squeeze the first W-shaped elastic sheet 305 to contract, enabling the sliding seat 201 to smoothly move through the upper part of the convex-shaped limiting block 306, and then the separation of the power connection post 202 from the charger plug;

[0057] When the sliding seat 201 completely passes through the upper part of the convex-shaped limiting block 306, the convex-shaped limiting block 306 will reset and move upward under the elastic force of the first W-shaped elastic sheet 305. At this time, the electromagnet 206 is powered off, and the sliding seat 201 contacts the vertical end face at the top of the convex-shaped limiting block 306, preventing the convex-shaped limiting block 306 from moving downward, and then maintaining this position, keeping the separation state of the power connection post 202 and the charger plug stable, effectively improving the safety after the lithium battery is fully charged.

[0058] Please refer specifically to Figures 1 to 4 , the reset unit includes a reset spring 203 and a through notch 205. The locking assembly 3 further includes an unlocking pressing block 304;

[0059] The reset springs 203 are distributed between the sliding seat 201 and the inner wall end face of the docking socket 101 and are symmetrically arranged in two groups. The reset springs 203 are used to provide a reset thrust for the sliding seat 201 that has contracted and moved backward;

[0060] The through slot 205 is opened at one end of the sliding seat 201, passing through both ends of the sliding seat 201 and the magnetic metal sheet 204. The through slot 205 is aligned with the vertical part of the L-shaped slider 301 in the horizontal direction;

[0061] When the magnetic metal sheet 204 is adsorbed by the electromagnet 206, the through slot 205 is used to prevent extrusion and blockage of the L-shaped slider 301;

[0062] The unlocking pressing block 304 is fixed to one end of the vertical part of the L-shaped slider 301 close to the convex limiting block 306. After the charger plug is removed from the inside of the docking socket 101, the L-shaped slider 301 resets to the initial position and forms an extrusion on the convex limiting block 306 through the unlocking pressing block 304 to make it move downward, so as to release the locking of the sliding seat 201 after contraction and backward movement.

[0063] In this embodiment, it should be noted that when the electromagnet 206 is powered off, the L-shaped slider 301 will be replicated to the position before being adsorbed and moved under the action of the second W-shaped elastic piece 307. At this time, the vertical part of the L-shaped slider 301 can pass through the through slot 205 without colliding with the magnetic metal sheet 204 and the sliding seat 201. At the same time, the extrusion convex block 302 moves to below the convex limiting block 306 again, further improving the locking stability of the sliding seat 201;

[0064] When the charger plug is taken out from the inside of the docking socket 101, at this time, the external force receiving block 309 loses the external extrusion force, and the L-shaped slider 301, the extrusion column 308, and the external force receiving block 309 reset to the initial position under the elastic force of the second W-shaped elastic piece 307. The L-shaped slider 301 drives the extrusion convex block 302 away from the convex limiting block 306, thereby releasing the limit on the convex limiting block 306. At the same time, the L-shaped slider 301 drives the unlocking pressing block 304 to insert between the convex limiting block 306 and the top of the inner wall of the side-lying F-shaped sliding groove 104. At this time, the convex limiting block 306 receives a downward extrusion force, so that the convex limiting block 306 moves downward and contracts into the anti-fooling convex block 102, thus releasing the limit on the sliding seat 201. At this time, the sliding seat 201 resets to the initial position under the elastic force of the reset spring 203, so as to facilitate subsequent secondary charging operations;

[0065] It should be added that the sliding seat 201 is formed with a convex block, and a sliding groove for limiting the sliding of the convex block is opened at the top of the inner wall of the docking socket 101, so as to provide a limit for the reset of the sliding seat 201 and avoid excessive pulling on the wire of the docking electric column 202 caused by excessive movement of the sliding seat 201.

[0066] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. A lithium battery charging protection structure, comprising a charging head (1) consisting of a docking socket (101) and an anti-fool-proofing protrusion (102), wherein the anti-fool-proofing protrusion (102) is fixed to the bottom of the inner wall of the docking socket (101), characterized in that: The anti-mistake protrusion (102) is provided with a storage groove (103) and a side-falling F-shaped slide groove (104) inside, the side-falling F-shaped slide groove (104) is distributed at one end of the storage groove (103) and is connected to the storage groove (103), the top of the side-falling F-shaped slide groove (104) passes through the top of the anti-mistake protrusion (102), and the end of the side-falling F-shaped slide groove (104) away from the storage groove (103) passes through the outer end of the anti-mistake protrusion (102), the inner side of the docking socket (101) is provided with a power connection component (2), and the storage groove (103) and the side-falling F-shaped slide groove (104) are provided with a locking component (3) extending to the inside and outside of the docking socket (101); The power connection component (2) comprises a charging unit, a power-off unit, and a reset unit; The locking assembly (3) is used to achieve a limiting effect on the charging unit when the charger plug is plugged into the charging unit; When the charging unit is separated from the charger plug by the power-off unit, the charging unit is unlocked by the locking assembly (3) and the retracted charging unit is locked for the second time; When the charger plug is separated from the docking socket (101), the locking assembly (3) releases the locking of the retracted charging unit, and the resetting unit automatically resets the charging unit.

2. A lithium battery charging protection structure according to claim 1, characterized in that: The charging unit comprises a sliding seat (201) and a charging post (202); The sliding seat (201) is horizontally slidably mounted on the inner side of the docking socket (101) and is sleeved with the outer side of the fool-proof protrusion (102); the power connection post (202) is mounted on the inner side of the sliding seat (201) and protrudes from both ends of the sliding seat (201); one end of the power connection post (202) away from the opening of the docking socket (101) passes through the outside of the docking socket (101) through a wire and is electrically connected to the lithium battery; The charging operation of the lithium battery is realized by inserting the charger plug into the docking socket (101) and plugging it into the power connection post (202).

3. A lithium battery charging protection structure according to claim 2, characterized in that: The power-off unit comprises a magnetic metal sheet (204) and an electromagnet (206); The electromagnet (206) is fixed to one end of the inner wall of the docking socket (101), the magnetic metal sheet (204) is fixed to one end of the sliding seat (201) close to the electromagnet (206) and is aligned with the electromagnet (206), and the electromagnet (206) is electrically connected to the lithium battery and the lithium battery protection board through a wire and a controller; After the lithium battery is charged, the lithium battery protection board sends the information to the controller, and the controller connects the circuit between the electromagnet (206) and the lithium battery. The electromagnet (206) is powered to generate a magnetic attraction force to adsorb the magnetic metal sheet (204), thereby achieving the contraction and movement of the sliding seat (201) and the power connection post (202) and separating them from the charger plug.

4. A lithium battery charging protection structure according to claim 3, characterized in that: The locking assembly (3) comprises an L-shaped sliding block (301), an extrusion convex block (302), a straight notch (303), a first W-shaped spring piece (305), a convex limiting block (306), a second W-shaped spring piece (307), an extrusion column (308), and an external force bearing block (309); The L-shaped slider (301) is horizontally slidably connected to the inner side of the side-falling F-shaped slide groove (104), and the vertical portion of the L-shaped slider (301) protrudes into the interior of the docking socket (101) through a vertical slot of the side-falling F-shaped slide groove (104) and is located between the electromagnet (206) and the through slot (205), the extrusion protrusion (302) is fixed to the top of the horizontal part of the L-shaped slider (301), and the straight slot (303) penetrates the horizontal part of the L-shaped slider (301) and the upper and lower ends of the extrusion protrusion (302); The first W-shaped spring piece (305) is located inside the straight slot (303) and fits with the bottom of the inner wall of the inverted F-shaped slide groove (104); the convex stopper (306) is fixed to the bottom of the first W-shaped spring piece (305) and protrudes into the interior of the docking socket (101) through another vertical slot of the inverted F-shaped slide groove (104), and is located at one end of the sliding seat (201); The second W-shaped spring sheet (307) is distributed between the inner wall end face of the side-inverted F-shaped slide groove (104) and the end face of the vertical part of the L-shaped slider (301); the extrusion column (308) is horizontally slidably connected to the inner side of the side-inverted F-shaped slide groove (104) and fits with one end of the horizontal part of the L-shaped slider (301); the other end of the extrusion column (308) passes through the side-inverted F-shaped slide groove (104), the storage groove (103) to the outside of the docking socket (101) and is fixedly connected to the external force-bearing block (309); When the charger plug is inserted into the docking socket (101), the external force bearing block (309) is pressed, so that the pressing column (308), the L-shaped sliding block (301), and the pressing protrusion (302) move, and the pressing protrusion (302) moves to the top of the first W-shaped spring sheet (305), so that the first W-shaped spring sheet (305) cannot move downward, thereby realizing the movement limit of the sliding seat (201).

5. A lithium battery charging protection structure according to claim 4, characterized in that: When the electromagnet (206) is powered to generate a magnetic attraction force to adsorb the magnetic metal sheet (204), the L-shaped slider (301) is synchronously adsorbed and moved backwards, so as to enable the extrusion convex block (302) to continue to move to release the extrusion of the convex limit block (306); The top of the convex limiting block (306) has an end close to the sliding seat (201) with an arc surface structure, and an end away from the sliding seat (201) with a vertical surface structure; The sliding seat (201) can squeeze the arc surface of the convex limiting block (306) to shrink it, and the vertical surface structure of the convex limiting block (306) can achieve limiting locking of the sliding seat (201) after shrinkage.

6. A lithium battery charging protection structure according to claim 4, characterized in that: The reset unit comprises a reset spring (203) and a through notch (205), and the locking assembly (3) further comprises an unlocking pressing block (304); The return springs (203) are distributed between the sliding seat (201) and the inner wall end surface of the docking socket (101) and are symmetrically arranged in two groups. The return springs (203) are used to provide a return thrust for the sliding seat (201) that is retracted and moved backwards; The through slot (205) is provided at one end of the sliding seat (201) and penetrates the sliding seat (201) and both ends of the magnetic metal sheet (204). The through slot (205) and the vertical portion of the L-shaped sliding block (301) are aligned in the horizontal direction. When the magnetic metal sheet (204) is attracted by the electromagnet (206), the through-notch (205) is used to avoid squeezing or blocking the L-shaped slider (301); The unlocking pressing block (304) is fixed to one end of the vertical portion of the L-shaped slider (301) close to the convex limiting block (306). After the charger plug is removed from the docking socket (101), the L-shaped slider (301) is reset to the initial position and the convex limiting block (306) is pressed downward by the unlocking pressing block (304), thereby releasing the locking of the retracted and backward-moving sliding seat (201).

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