Device for preventing battery from being overcharged

Abstract

The invention discloses a device for preventing a battery from being overcharged, and belongs to the technical field of stainless steel plate machining.The device for preventing the battery from being overcharged comprises a child protection barrel and a mother protection barrel which are symmetrically arranged, and the inner side of the child protection barrel and the inner side of the mother protection barrel are provided with two symmetrically-arranged fixed supporting seats; the child protection barrel and the mother protection barrel can form a cylindrical structure to protect an internal structure, the fixed supporting seats fixedly support the internal structure, the two fixed supporting seats are rotationally connected with two symmetrically arranged splitting power-off groove plates, the splitting power-off groove plates can control on-off of a circuit, overcharging of a battery is avoided, and the safety of the battery is improved. And an electromagnetic on-off structure is arranged between the splitting power-off groove plate and the fixed supporting seat. By arranging the electromagnetic on-off structure, the charging circuit can be disconnected under the condition of trickle charging, and the situation that the service life of a battery is shortened or electric shock is caused by overheating short circuit due to trickle charging after the battery is fully charged is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of battery charging protection, and in particular relates to a device for preventing a battery from being overcharged. Background Art

[0002] In order to improve the charging efficiency of the battery in the prior art, the battery is mostly supplemented with electric energy in the form of fast charging. In the initial stage of charging, the charger usually provides a higher current to quickly charge the battery. When the battery is close to being fully charged, the charging current will gradually decrease. Once the battery is fully charged, the charging current will further decrease to a very small value, which is called "trickle charging" or "floating charging" to compensate for the self-discharge of the battery.

[0003] Even in the case of a protection mechanism, long-term trickle charging will put a certain amount of pressure on the battery, which will reduce the overall life of the battery in the long run. At the same time, long-term "trickle charging" or "floating charging" will cause the battery and charger circuits to heat up, causing the battery or charger to overheat. Overheating may cause an internal short circuit in the battery, which in turn poses a risk of fire or explosion, causing the charger circuit to age, affecting charging efficiency and service life. At the same time, long-term "trickle charging" or "floating charging" will also cause unnecessary waste of electricity.

[0004] In the prior art, most people will directly unplug the battery or electrical appliance after charging is completed, while the charger remains in a charging state, which may easily cause an electric spark effect or a short circuit at the charging head, causing electric shock to nearby people or even a fire. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a charging device which cuts off the power after charging to prevent overcharging.

[0006] The technical solution adopted to solve the above technical problem is: a device for preventing battery overcharging, comprising a symmetrically arranged sub-protection barrel and a main protection barrel, wherein two symmetrically arranged fixed support seats are arranged inside the sub-protection barrel and the main protection barrel.

[0007] Through the above technical solution, the sub-protection barrel and the main protection barrel can form a cylindrical structure to protect the internal structure, and the fixed support seat fixedly supports the internal structure.

[0008] The two fixed support seats are both rotatably connected to two symmetrically arranged split power-off slot plates.

[0009] Through the above technical solution, splitting the power-off slot board can control the on-off of the circuit and avoid overcharging of the battery.

[0010] An electromagnetic on-off structure is arranged between the split power-off slot plate and the fixed support seat.

[0011] Furthermore, the two split power-off slot plates located on the same horizontal plane are fixedly connected with conductive protrusions and conductive connecting grooves on the inner walls away from the fixed support seat, and the conductive protrusions and conductive connecting grooves on the same horizontal plane are slidingly connected to the inner walls, the conductive protrusions and conductive connecting grooves are made of brass material, and the split power-off slot plates are made of plastic material.

[0012] Through the above technical solution, the conductive protrusion and the conductive connecting groove cooperate with each other to realize the circuit conduction of the charger to supply power to the battery, and the on-off control of the circuit can be realized by slidingly connecting the conductive protrusion and the conductive connecting groove. The brass material makes the circuit conduction performance good, and the plastic material has an insulating effect, which can effectively avoid electric shock accidents or short circuit accidents caused by leakage at the conductive protrusion and the conductive connecting groove.

[0013] Furthermore, the opening position on the surface of the split power-off slot plate is fixedly connected with two symmetrically arranged limit baffles, the opening position on the surface of the split power-off slot plate is slidably connected with a control slide, the control slide is fixedly connected with two symmetrical limit sliding claws close to one side of the corresponding split power-off slot plate, and the limit sliding claws are slidably connected to the limit sliding claws at the corresponding positions.

[0014] Through the above technical scheme, the symmetrically arranged limit baffles slide with the limit sliding claws at the corresponding positions to adjust the position of the control slide, thereby driving the split power-off slot plate to rotate around the rotation control axis and adjusting the angle of the split power-off slot plate, thereby realizing the control of the on and off of the conductive protrusions and the conductive connecting slots.

[0015] Furthermore, the limit baffle and the limit sliding claw are both made of graphite material, and on-off rotation holes are penetrated through the positions near the fixed support seat on both sides of the split power-off slot plate, and limit locking grooves are opened at the on-off rotation holes on the same side.

[0016] Through the above technical scheme, the graphite material has lubricating and wear-resistant effects, which can effectively ensure that the control slide slides on the surface of the split power-off slot plate. The on-off rotation hole ensures that the split power-off slot plate rotates at the rotation control axis position, and the limit locking groove and the magnetic plate cooperate to realize the control of the rotation of the split power-off slot plate.

[0017] Furthermore, the fixed support seat includes two symmetrically arranged mounting side plates, and two symmetrically arranged rotation control shafts are fixedly connected between the two mounting side plates. The rotation control shafts are rotationally connected to the on-off rotating holes, and the electromagnetic on-off structure includes a control elastic groove opened on the side of the rotation control shaft close to the limit locking groove.

[0018] Through the above technical solution, the installed side plate has the function of supporting the rotation control shaft.

[0019] Furthermore, a high-strength electromagnet is fixedly connected to the inner wall of the control elastic groove at the mounting side plate position, a magnetic attraction piece is attracted at the high-strength electromagnet position, the magnetic attraction piece is slidably connected to the inner wall of the control elastic groove, a separation spring is fixedly connected between the magnetic attraction piece and the control elastic groove, and the magnetic attraction piece is slidably connected to the inner wall of the limit locking groove.

[0020] Through the above technical scheme, the high-strength electromagnet has a strong magnetism under the rated current state, and can attract the magnetic sheet so that the magnetic sheet is located in the limit engaging groove, and limit the rotation of the split power-off slot plate to keep it in the power supply state. When trickle charging occurs, the current in the circuit decreases, and the magnetism of the high-strength electromagnet decreases. The suction force of the high-strength electromagnet is less than the traction force of the separation spring, and the magnetic sheet is separated from the high-strength electromagnet. Under the action of the separation spring, the magnetic sheet is disengaged from the limit engaging groove position, so that the split power-off slot plate flips under the action of the power-off spring, thereby realizing the power off of the charger and ending the trickle charging.

[0021] Furthermore, a button slot is provided through the middle of one side where the sub-protective barrel and the main protective barrel are close to each other, and an on-off control button is slidably connected to the inner wall of the button slot, and one end of the on-off control button located in the sub-protective barrel and the main protective barrel is fixedly connected to a rotating connecting seat, and two symmetrically arranged linkage guide plates are rotatably connected to both sides of the lower surface of the rotating connecting seat, and the two linkage guide plates are rotatably connected to the control slide seat at the corresponding position at one end away from the rotating connecting seat, and a power-off spring is fixedly connected between the upper surface of the rotating connecting seat and the inner wall of the sub-protective barrel and the main protective barrel.

[0022] Through the above technical solution, when the on-off control button is pressed, the slide is controlled to slide, and the split power-off slot plate is pressed down, so that the conductive protrusion and the conductive connection slot cooperate to achieve circuit conduction, and the power-off spring rebounds quickly when the high-strength electromagnet takes effect, so that the circuit is disconnected.

[0023] Furthermore, the sub-protective barrel is fixedly connected to two symmetrically arranged fixed blocks at both ends of one side close to the mother protective barrel, and two fixed slots are provided at both ends of one side close to the fixed blocks. The fixed blocks are slidably connected to the inner walls of the fixed slots at corresponding positions, and the fixed blocks are fixedly connected to the fixed slots at corresponding positions by bolts, and installation limit slots are provided through the center positions of both ends of the sub-protective barrel and the mother protective barrel.

[0024] Through the above technical solution, the fixed plug and the fixed slot cooperate to realize the merging and fixing of the sub-protective barrel and the main protective barrel to form a complete cylinder, and the installation limit groove can realize the clamping and fixing of the conductive wire harness.

[0025] Furthermore, the sub-protective barrel and the main protective barrel are both fixed with a conductive wire harness at the installation limit groove position, the positive and negative poles of the conductive wire harness are respectively electrically connected to the conductive protrusion or conductive connection groove on the same side, and the end of the conductive wire harness away from the main protective barrel is electrically connected to a charging connector.

[0026] Through the above technical solution, the charging connector can connect the device to the charger and the battery. The inner wall of the conductive connection groove is provided with an arc-shaped protrusion, which facilitates full contact with the conductive bump to avoid poor contact caused by long-term use.

[0027] Furthermore, two parallel inner walls of the female protective barrel are fixedly connected with fixed mounting plates, and the fixed support seat is fixedly connected to the fixed mounting plates at corresponding positions.

[0028] The beneficial effects of the present invention are as follows: (1) The present invention sets an electromagnetic on-off structure. When the charger trickles charge the battery after charging is completed, the current in the charger will decrease, and the magnetism of the high-strength electromagnet will decrease. The suction force of the high-strength electromagnet is less than the traction force of the separation spring, and the magnetic sheet is separated from the high-strength electromagnet. Under the action of the separation spring, the magnetic sheet is separated from the limit locking groove position, so that the split power-off groove plate is flipped under the action of the power-off spring, thereby realizing the power-off of the charger and ending the trickle charging. This can effectively avoid the risk of charger circuit aging and even fire caused by overheating of the charger caused by trickle charging, extend the service life of the battery, and effectively save electric energy; (2) The present invention The invention is provided with an on-off control button, a rotating connection seat and a split power-off slot plate. When charging is required, the invention is first connected to the charger and the electrical appliance or battery to be charged, and the two on-off control buttons are pressed to make the conductive protrusion contact with the conductive connection slot. At this time, the socket of the charger is connected to the power supply, so that the high-strength electromagnet is energized to generate a strong magnetism. The high-strength electromagnet attracts and attracts the magnetic sheet, so that the split power-off slot plate is clamped and fixed, and the split power-off slot plate cannot rotate, so that the passage can be realized, that is, the passage is achieved during charging. When charging is stopped, even if the charger is not unplugged from the charging port away from the power supply, it cannot discharge, thereby avoiding electric shock to the contactor or fire caused by electric spark effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional structural schematic diagram of a device for preventing battery overcharging according to the present invention; Figure 2 It is an assembly diagram of a sub-protection barrel and a main protection barrel of a device for preventing battery overcharging of the present invention; Figure 3 It is a schematic diagram of the internal structure of a device for preventing battery overcharging according to the present invention; Figure 4 It is an assembly diagram of a disassembled power-off slot plate of a device for preventing battery overcharging of the present invention; Figure 5 It is a three-dimensional structural diagram of a sub-protection barrel of a device for preventing battery overcharging of the present invention; Figure 6 It is a three-dimensional diagram of an electromagnetic on-off structure of a device for preventing battery overcharging according to the present invention; Figure 7 yes Figure 6 The enlarged cross-sectional view at A in the middle; Figure 8 The present invention is a structural diagram of a conductive connection groove of a device for preventing battery overcharging.

[0030] Figure markings: 1. Sub-protection barrel; 2. Main protection barrel; 3. On-off control button; 4. Conductive harness; 5. Button slot; 6. Installation limit slot; 7. Fixed plug block; 8. Fixed installation plate; 9. Rotating connection seat; 10. Charging connector; 11. Power-off spring; 12. Linkage guide plate; 13. Control slide seat; 14. Fixed slot; 15. Limit baffle; 16. Limit sliding claw; 17. Conductive protrusion; 18. Conductive connection slot; 19. Split power-off slot plate; 20. On-off rotation hole; 21. Limit locking slot; 22. Fixed support seat; 220. Installation side plate; 221. Rotating control shaft; 222. Magnetic plate; 223. Control elastic slot; 224. Separation spring; 225. High-strength electromagnet. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] like Figure 1-Figure 8 As shown, a device for preventing a battery from overcharging in this embodiment comprises a symmetrically arranged sub-protective barrel 1 and a main protective barrel 2, wherein two symmetrically arranged fixed support seats 22 are arranged inside the sub-protective barrel 1 and the main protective barrel 2, and the sub-protective barrel 1 and the main protective barrel 2 can form a cylindrical structure to protect the internal structure, and the fixed support seat 22 provides fixed support for the internal structure.

[0033] Two parallel inner walls of the female protective barrel 2 are fixedly connected with a fixed mounting plate 8, and the fixed support seat 22 is fixedly connected to the fixed mounting plate 8 at the corresponding position.

[0034] Two symmetrically arranged fixed blocks 7 are fixedly connected at both ends of the sub-protective barrel 1 close to the mother protective barrel 2. Two fixed slots 14 are provided at both ends of the mother protective barrel 2 close to the fixed blocks 7. The fixed blocks 7 are slidably connected to the inner walls of the fixed slots 14 at the corresponding positions, and the fixed blocks 7 are fixedly connected to the fixed slots 14 at the corresponding positions by bolts. Installation limit grooves 6 are provided through the center positions of both ends of the sub-protective barrel 1 and the mother protective barrel 2. The fixed blocks 7 and the fixed slots 14 cooperate to realize the combination and fixation of the sub-protective barrel 1 and the mother protective barrel 2 to form a complete cylinder. The installation limit grooves 6 can realize the clamping and fixation of the conductive wiring harness 4.

[0035] The sub-protective barrel 1 and the main protective barrel 2 are both fixed with a conductive harness 4 at the installation limit groove 6. The positive and negative poles of the conductive harness 4 are respectively electrically connected to the conductive protrusion 17 or the conductive connecting groove 18 on the same side. The end of the conductive harness 4 away from the main protective barrel 2 is electrically connected to a charging connector 10. The charging connector 10 can connect the device to the charger and the battery. The inner wall of the conductive connecting groove 18 is provided with an arc-shaped protrusion, which facilitates full contact with the conductive protrusion 17 to avoid poor contact caused by long-term use and ensure the smoothness of circuit conduction.

[0036] The two fixed support seats 22 are both rotatably connected to two symmetrically arranged split power-off slot plates 19, and the split power-off slot plates 19 can control the on-off of the circuit to prevent the battery from overcharging.

[0037] The two split power-off slot plates 19 located on the same horizontal plane are fixedly connected with conductive protrusions 17 and conductive connecting grooves 18 on the inner walls away from the fixed support seat 22 respectively. The conductive protrusions 17 and the conductive connecting grooves 18 located on the same horizontal plane are slidably connected to the inner walls. The conductive protrusions 17 and the conductive connecting grooves 18 are made of brass material, and the split power-off slot plates 19 are made of plastic material. The conductive protrusions 17 and the conductive connecting grooves 18 cooperate with each other to realize the circuit conduction of the charger to supply power to the battery, and the on-off control of the circuit can be realized by slidingly connecting the conductive protrusions 17 and the conductive connecting grooves 18. The brass material makes the circuit conduction performance good, and the plastic material has an insulating effect, which can effectively avoid electric shock accidents or short circuit accidents caused by leakage at the conductive protrusions 17 and the conductive connecting grooves 18.

[0038] Two symmetrically arranged limit baffles 15 are fixedly connected to the opening position on the surface of the split power-off slot plate 19, and a control slide 13 is slidably connected to the opening position on the surface of the split power-off slot plate 19. Two symmetrical limit sliding claws 16 are fixedly connected to the control slide 13 on one side close to the corresponding split power-off slot plate 19, and the limit sliding claws 16 are slidably connected to the limit sliding claws 16 at the corresponding positions. The symmetrically arranged limit baffles 15 slide with the limit sliding claws 16 at the corresponding positions to adjust the position of the control slide 13, thereby driving the split power-off slot plate 19 to rotate around the rotating control axis 221, adjusting the angle of the split power-off slot plate 19, and realizing the control of the on and off of the conductive protrusion 17 and the conductive connecting slot 18.

[0039] The limit baffle 15 and the limit sliding claw 16 are both made of graphite material. On-off rotation holes 20 are penetrated at the positions near the fixed support seat 22 on both sides of the split power-off slot plate 19, and a limit locking groove 21 is provided at the position of the on-off rotation hole 20 on the same side. The graphite material has lubricating and wear-resistant effects, which can effectively ensure that the control slide 13 slides on the surface of the split power-off slot plate 19. The on-off rotation hole 20 ensures that the split power-off slot plate 19 rotates at the position of the rotation control shaft 221, and the limit locking groove 21 cooperates with the magnetic attraction piece 222 to control the rotation of the split power-off slot plate 19.

[0040] An electromagnetic on-off structure is provided between the split power-off slot plate 19 and the fixed support seat 22 , and the mounting side plate 220 has the function of supporting the rotating control shaft 221 .

[0041] The fixed support seat 22 includes two symmetrically arranged mounting side plates 220, and two symmetrically arranged rotation control shafts 221 are fixedly connected between the two mounting side plates 220. The rotation control shaft 221 is rotationally connected to the on-off rotating hole 20, and the electromagnetic on-off structure includes a control elastic groove 223 opened on the side of the rotation control shaft 221 close to the limit locking groove 21.

[0042] The inner wall of the control elastic groove 223 is fixedly connected to the installation side plate 220, and a high-strength electromagnet 225 is attracted to the position of the high-strength electromagnet 225. The magnetic attraction piece 222 is slidably connected to the inner wall of the control elastic groove 223. A separation spring 224 is fixedly connected between the magnetic attraction piece 222 and the control elastic groove 223. The magnetic attraction piece 222 is slidably connected to the inner wall of the limit clamping groove 21. The high-strength electromagnet 225 has a strong magnetism under the rated current state, and can attract the magnetic attraction piece 222, so that the magnetic attraction piece 222 is located at the limit clamping groove 21. In the engagement slot 21, the rotation of the split power-off slot plate 19 is limited to keep it in the power supply state. When trickle charging occurs, the current in the circuit decreases, and the magnetism of the high-strength electromagnet 225 decreases. The suction force of the high-strength electromagnet 225 is less than the traction force of the separation spring 224, and the magnetic sheet 222 is separated from the high-strength electromagnet 225. Under the action of the separation spring 224, the magnetic sheet 222 is disengaged from the position of the limited engagement slot 21, so that the split power-off slot plate 19 is flipped under the action of the power-off spring 11, thereby realizing the power-off of the charger and ending the trickle charging.

[0043] A button slot 5 is provided through the middle of the side where the sub-protection barrel 1 and the mother protection barrel 2 are close to each other, and an on-off control button 3 is slidably connected to the inner wall of the button slot 5. The on-off control button 3 is located at one end inside the sub-protection barrel 1 and the mother protection barrel 2 and is fixedly connected to a rotating connection seat 9. Two symmetrically arranged linkage guide plates 12 are rotatably connected to the two sides of the lower surface of the rotating connection seat 9. The two linkage guide plates 12 are rotatably connected to the control slide 13 at the corresponding position at one end away from the rotating connection seat 9. A power-off spring 11 is fixedly connected between the upper surface of the rotating connection seat 9 and the inner wall of the sub-protection barrel 1 and the mother protection barrel 2. When the on-off control button 3 is pressed, the control slide 13 slides, and the split power-off slot plate 19 is pressed down, so that the conductive protrusion 17 and the conductive connection slot 18 cooperate to realize circuit conduction, and the power-off spring 11 rebounds quickly when the high-strength electromagnet 225 takes effect, so that the circuit is disconnected.

[0044] The working principle of this embodiment is as follows: when in use, connect the charging connector 10 at one end to the output end of the charger, then connect the charging connector 10 at the end away from the charger to an electrical appliance (an electrical appliance with a built-in battery, such as a mobile phone and a Bluetooth headset) or a battery, and connect the charger to a power socket; When in use, pinch the two on-off control buttons 3 with one hand to move the rotating connection seat 9 downward, then the power-off spring 11 is stretched, and the linkage guide plate 12 drives the control slide 13 to press down. When the control slide 13 is pressed down, the control slide 13 and the limit sliding claw 16 slide at the position of the limit baffle 15, and the two split power-off slot plates 19 on the same horizontal plane flip over. At this time, the conductive protrusion 17 contacts the conductive connection slot 18 at the corresponding position to form a charging path, and the electrical appliance or battery is charged. At this time, a large current is maintained in the charger circuit, and the high-strength electromagnet 225 obtains a large current and generates a strong magnetism to attract and fix the magnetic sheet 222. At this time, the magnetic sheet 222 is stuck in the position of the limit locking slot 21 of the on-off rotating hole 20, and the split power-off slot plate 19 is relatively fixed and cannot rotate, and the on-off control button 3 is released; When the battery is fully charged, a trickle charging effect occurs, and the current in the charger circuit decreases, so that the high-strength electromagnet 225 cannot obtain sufficient electrical energy, and the magnetism of the high-strength electromagnet 225 is reduced, and it cannot effectively attract the magnetic sheet 222. The magnetic sheet 222 retreats under the action of the separation spring 224, and the magnetic sheet 222 cannot be stuck in the limit locking groove 21 of the on-off rotating hole 20. Under the action of the power-off spring 11, the rotating connecting seat 9 rebounds, and the linkage guide plate 12 deflects and displaces, and the control slide 13 moves upward, and the split power-off slot plate 19 flips upward, the conductive protrusion 17 and the conductive connecting slot 18 are separated from each other, and the charging circuit is disconnected, and no trickle current is generated, which can effectively protect the battery. In addition, when the electrical appliance or battery is unplugged during the charging process, there will be trickle current in the charging circuit, which will also cause the charging circuit to be disconnected and there will be no current. Even if the charger is not unplugged from the power supply position, the charging connector 10 position will not have a short circuit or discharge, making the charger safer to use.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A device for preventing a battery from overcharging, characterized in that: It comprises a symmetrically arranged sub-protection barrel (1) and a main protection barrel (2), wherein two symmetrically arranged fixed support seats (22) are arranged inside the sub-protection barrel (1) and the main protection barrel (2); The two fixed support seats (22) are both rotatably connected to two symmetrically arranged split power-off slot plates (19); An electromagnetic on-off structure is provided between the split power-off slot plate (19) and the fixed support seat (22).

2. A device for preventing battery overcharging according to claim 1, characterized in that: The inner walls of the two split power-off slot plates (19) located on the same horizontal plane and away from the fixed support seat (22) are respectively fixedly connected with conductive protrusions (17) and conductive connecting grooves (18); the inner walls of the conductive protrusions (17) and conductive connecting grooves (18) located on the same horizontal plane are slidably connected; the conductive protrusions (17) and conductive connecting grooves (18) are made of brass material, and the split power-off slot plates (19) are made of plastic material.

3. A device for preventing battery overcharging according to claim 1, characterized in that: The surface opening position of the split power-off slot plate (19) is fixedly connected with two symmetrically arranged limit baffles (15), the surface opening position of the split power-off slot plate (19) is slidably connected with a control slide (13), and the control slide (13) is fixedly connected with two symmetrical limit sliding claws (16) on one side close to the corresponding split power-off slot plate (19), and the limit sliding claws (16) are slidably connected with the limit sliding claws (16) at the corresponding positions.

4. A device for preventing battery overcharging according to claim 3, characterized in that: The limit baffle (15) and the limit sliding claw (16) are both made of graphite material, and on-off rotation holes (20) are provided through the positions of the two sides of the split power-off slot plate (19) close to the fixed support seat (22), and the on-off rotation holes (20) on the same side are provided with limit locking grooves (21).

5. A device for preventing battery overcharging according to claim 4, characterized in that: The fixed support seat (22) comprises two symmetrically arranged mounting side plates (220), two symmetrically arranged rotation control shafts (221) are fixedly connected between the two mounting side plates (220), the rotation control shafts (221) are rotatably connected to the on-off rotation holes (20), and the electromagnetic on-off structure comprises a control elastic groove (223) provided on a side of the rotation control shaft (221) close to the limit locking groove (21).

6. A device for preventing battery overcharging according to claim 5, characterized in that: The inner wall of the control elastic groove (223) is fixedly connected to a high-strength electromagnet (225) at the position of the mounting side plate (220), a magnetic attraction piece (222) is attracted to the position of the high-strength electromagnet (225), the magnetic attraction piece (222) is slidably connected to the inner wall of the control elastic groove (223), a separation spring (224) is fixedly connected between the magnetic attraction piece (222) and the control elastic groove (223), and the magnetic attraction piece (222) is slidably connected to the inner wall of the limit locking groove (21).

7. A device for preventing battery overcharging according to claim 3, characterized in that: A button slot (5) is provided through the middle of one side where the sub-protective barrel (1) and the main protective barrel (2) are close to each other. An on-off control button (3) is slidably connected to the inner wall of the button slot (5). One end of the on-off control button (3) located inside the sub-protective barrel (1) and the main protective barrel (2) is fixedly connected to a rotating connection seat (9). Two symmetrically arranged linkage guide plates (12) are rotatably connected to the two sides of the lower surface of the rotating connection seat (9). The two linkage guide plates (12) are rotatably connected to control slides (13) at corresponding positions at one end away from the rotating connection seat (9). A power-off spring (11) is fixedly connected between the upper surface of the rotating connection seat (9) and the inner wall of the sub-protective barrel (1) and the main protective barrel (2).

8. A device for preventing battery overcharging according to claim 1, characterized in that: The sub-protective barrel (1) is fixedly connected to two symmetrically arranged fixed plug blocks (7) at both ends of one side close to the main protective barrel (2), and two fixed slots (14) are provided at both ends of one side close to the fixed plug blocks (7). The fixed plug blocks (7) are slidably connected to the inner walls of the fixed slots (14) at corresponding positions, and the fixed plug blocks (7) are fixedly connected to the fixed slots (14) at corresponding positions by bolts. The sub-protective barrel (1) and the main protective barrel (2) are provided with installation limit slots (6) at the center positions of both ends.

9. A device for preventing battery overcharging according to claim 8, characterized in that: The sub-protective barrel (1) and the main protective barrel (2) are both fixedly engaged with a conductive wire harness (4) at the installation limit groove (6); the positive and negative electrodes of the conductive wire harness (4) are respectively electrically connected to the conductive protrusion (17) or the conductive connection groove (18) on the same side; and the end of the conductive wire harness (4) away from the main protective barrel (2) is electrically connected to a charging connector (10).

10. A device for preventing battery overcharging according to claim 1, characterized in that: Two parallel inner walls of the female protective barrel (2) are fixedly connected with fixed mounting plates (8), and the fixed support seat (22) is fixedly connected to the fixed mounting plates (8) at corresponding positions.

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