A device for preventing overcharging of a battery

Abstract

The present invention discloses a device for preventing overcharging of batteries, belonging to the technical field of stainless steel sheet processing. The device for preventing overcharging of batteries includes symmetrically arranged sub-protection barrels and a mother protection barrel. Two symmetrically arranged fixed support seats are provided inside the sub-protection barrel and the mother protection barrel. The sub-protection barrel and the mother protection barrel can form a cylindrical structure to protect the internal structure, and the fixed support seats fix and support the internal structure. Two symmetrically arranged split power-off slot plates are rotatably connected at the positions of the two fixed support seats. The split power-off slot plates can control the on-off of the circuit to avoid overcharging of the battery. An electromagnetic on-off structure is provided between the split power-off slot plates and the fixed support seats. By setting the electromagnetic on-off structure, the present invention can achieve the disconnection of the charging circuit under the condition of trickle charging, avoiding the reduction of battery life or the situation of overheating, short-circuiting and electric shock caused by trickle charging after the battery is fully charged.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery charging protection, and particularly relates to a device for preventing overcharging of a battery. Background Art

[0002] In the prior art, in order to improve the charging efficiency of the battery, the battery mostly uses a fast charging method to supplement electric energy. At the initial stage of charging, the charger usually provides a relatively high 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, called "trickle charging" or "float charging", which is used to compensate for the self-discharge of the battery.

[0003] Even with a protection mechanism, long-term trickle charging will exert a certain pressure on the battery. In the long run, it will reduce the overall life of the battery. At the same time, long-term "trickle charging" or "float charging" will cause the battery and the charger circuit to heat up, resulting in overheating of the battery or charger. Overheating may lead to an internal short circuit of the battery, which may further cause the risk of fire or explosion, cause the aging of the charger circuit, affect the charging efficiency and service life, and at the same time, long-term "trickle charging" or "float charging" will also cause unnecessary waste of electric energy.

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

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

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

[0007] Through the above technical solution, the sub-protection barrel and the mother protection barrel can form a cylindrical structure to protect the internal structure, and the fixed support seats fix and support the internal structure.

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

[0009] Through the above technical solution, the split power-off slot plates can control the on-off of the circuit to 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] Further, on the inner walls of the two split power-off groove plates located on the same horizontal plane and away from the fixed support base, a conductive bump and a conductive connection groove are respectively fixedly connected. The conductive bump and the conductive connection groove located on the same horizontal plane are slidably connected to each other. The conductive bump and the conductive connection groove are made of brass material, and the split power-off groove plate is made of plastic material.

[0012] Through the above technical solution, the cooperation between the conductive bump and the conductive connection groove can realize the conduction of the charger circuit to supply power to the battery. And by slidably connecting the conductive bump and the conductive connection groove, the on-off control of the circuit can be realized. The brass material enables good conduction performance of the circuit, and the plastic material has an insulating effect, which can effectively avoid electric shock accidents or short-circuit accidents caused by leakage of electricity at the positions of the conductive bump and the conductive connection groove.

[0013] Further, two symmetrically arranged limiting baffles are fixedly connected to the opening positions on the surface of the split power-off groove plate. A control sliding seat is slidably connected to the opening position on the surface of the split power-off groove plate. Two symmetrically arranged limiting sliding claws are fixedly connected to one side of the control sliding seat close to the corresponding split power-off groove plate, and the limiting sliding claws are slidably connected to the limiting baffles at the corresponding positions.

[0014] Through the above technical solution, the symmetrically arranged limiting baffles slide with the limiting sliding claws at the corresponding positions to adjust the position of the control sliding seat, thereby driving the split power-off groove plate to rotate around the rotation control shaft and adjusting the angle of the split power-off groove plate, so as to realize the on-off control of the conductive bump and the conductive connection groove.

[0015] Further, both the limiting baffle and the limiting sliding claw are made of graphite material. Through holes for on-off rotation are penetrated and opened at positions on both sides of the split power-off groove plate close to the fixed support base, and limiting engaging grooves are opened at the positions of the through holes for on-off rotation on the same side.

[0016] Through the above technical solution, the graphite material has the effects of lubrication and wear resistance, which can effectively ensure the sliding of the control sliding seat on the surface of the split power-off groove plate. The through holes for on-off rotation ensure the rotation of the split power-off groove plate at the position of the rotation control shaft, and the cooperation between the limiting engaging groove and the magnetic attracting sheet can realize the control of the rotation of the split power-off groove plate.

[0017] Further, the fixed support base includes two symmetrically arranged installation side plates. Two symmetrically arranged rotation control shafts are fixedly connected between the two installation side plates. The rotation control shafts are rotatably connected through the through holes for on-off rotation. The electromagnetic on-off structure includes a control elastic groove opened on one side of the rotation control shaft close to the limiting engaging groove.

[0018] Through the above technical solution, the installation side plates play a role in supporting the rotation control shafts.

[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] Further, wire harnesses are snap - fixed at the positions of the installation limit grooves of the sub - protection barrel and the mother - protection barrel. The positive and negative poles of the wire harnesses are electrically connected to the conductive bumps or conductive connection grooves on the same side respectively. One end of the wire harness far from the mother - protection barrel is electrically connected to a charging connector.

[0026] Through the above - mentioned technical solution, the charging connector can connect the device with the charger and the battery. The inner wall of the conductive connection groove is provided with arc - shaped protrusions, which are convenient for full contact with the conductive bumps, avoiding poor contact caused by long - term use.

[0027] Further, two parallel inner walls of the mother - protection barrel are fixedly connected with fixed mounting plates, and the fixed support seats are fixedly connected with the corresponding fixed mounting plates.

[0028] The beneficial effects of the present invention are as follows: (1) By setting the electromagnetic on - off structure, when the charger performs trickle charging on the battery after charging is completed, the current in the charger will decrease, so the magnetism of the high - strength electromagnet will decrease. Then the suction force of the high - strength electromagnet is less than the traction force of the separation spring, and the magnetic attracting piece is separated from the high - strength electromagnet. Under the action of the separation spring, the magnetic attracting piece disengages from the position of the limit snap - fit groove, causing the split power - off slot plate to flip under the action of the power - off spring, realizing the power - off of the charger. The trickle charging ends, which can effectively avoid the risk of charger line aging or even fire caused by overheating of the charger due to trickle charging, extend the service life of the battery, and effectively save electric energy at the same time. (2) By setting the on - off control button, the rotating connection seat and the split power - off slot plate, when charging is required, first connect the present invention with the charger and the electrical appliance or battery to be charged. Press the two on - off control buttons to make the conductive bumps contact the conductive connection grooves. At this time, connect the socket of the charger to the power supply, so that the high - strength electromagnet is energized to generate strong magnetism. Then the high - strength electromagnet attracts the magnetic attracting piece, making the split power - off slot plate be snap - fixed, and the split power - off slot plate cannot rotate, thus realizing a closed circuit, that is, a closed circuit during charging. When charging stops, even if the charger is not unplugged from the power supply charging port, it cannot discharge, avoiding electric shock to the contact person or the occurrence of a fire due to the spark effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a three - dimensional structural schematic diagram of a device for preventing over - charging of a battery according to the present invention;

[0030] Figure 2 is an assembly drawing of the sub - protection barrel and the mother - protection barrel of a device for preventing over - charging of a battery according to the present invention;

[0031] Figure 3 is an internal structural schematic diagram of a device for preventing over - charging of a battery according to the present invention;

[0032] Figure 4 It is an exploded power-off slot plate assembly drawing of a device for preventing overcharging of a battery according to the present invention;

[0033] Figure 5 It is a three-dimensional structure diagram of a sub-protection barrel of a device for preventing overcharging of a battery according to the present invention;

[0034] Figure 6 It is a three-dimensional view of an electromagnetic on-off structure of a device for preventing overcharging of a battery according to the present invention;

[0035] Figure 7 is Figure 6 the enlarged sectional view at position A in

[0036] Figure 8 It is a structure diagram of a conductive connection slot of a device for preventing overcharging of a battery according to the present invention.

[0037] Reference numerals: 1, sub-protection barrel; 2, mother protection barrel; 3, on-off control button; 4, conductive wire harness; 5, button slot hole; 6, installation limit slot; 7, fixed insertion block; 8, fixed mounting plate; 9, rotating connection seat; 10, charging connector; 11, power-off spring; 12, linkage guide plate; 13, control sliding seat; 14, fixed slot; 15, limit baffle; 16, limit sliding claw; 17, conductive bump; 18, conductive connection slot; 19, split power-off slot plate; 20, on-off rotation hole; 21, limit engagement slot; 22, fixed support seat; 220, installation side plate; 221, rotation control shaft; 222, magnetic induction sheet; 223, control elastic groove; 224, separation spring; 225, high-strength electromagnet. Detailed implementation manners

[0038] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to 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 used to limit the present invention.

[0039] As Figures 1-8 shown, a device for preventing overcharging of a battery in this embodiment includes symmetrically arranged sub-protection barrel 1 and mother protection barrel 2. Two symmetrically arranged fixed support seats 22 are arranged inside the sub-protection barrel 1 and the mother protection barrel 2. The sub-protection barrel 1 and the mother protection barrel 2 can form a cylindrical structure to protect the internal structure, and the fixed support seats 22 fix and support the internal structure.

[0040] Two parallel inner walls of the mother protection barrel 2 are fixedly connected with a fixed mounting plate 8, and the fixed support seat 22 is fixedly connected with the fixed mounting plate 8 at the corresponding position.

[0041] On both ends of the sub-protection barrel 1 near one side of the mother protection barrel 2, there are two symmetrically arranged fixed insertion blocks 7 fixedly connected. On both ends of the mother protection barrel 2 near the fixed insertion blocks 7, there are two fixed slots 14 respectively opened. The fixed insertion blocks 7 are slidably connected to the inner walls of the corresponding fixed slots 14, and the fixed insertion blocks 7 and the corresponding fixed slots 14 are fixedly connected by bolts. At the central positions of both ends of the sub-protection barrel 1 and the mother protection barrel 2, there are installation limit slots 6 penetrating. The cooperation of the fixed insertion blocks 7 and the fixed slots 14 can realize the combination and fixation of the sub-protection barrel 1 and the mother protection barrel 2 to form a complete cylinder body, and the installation limit slots 6 can realize the clamping and fixation of the wire harness 4.

[0042] At the position of the installation limit slots 6 of the sub-protection barrel 1 and the mother protection barrel 2, there are wire harnesses 4 clamped and fixed. The positive and negative electrodes of the wire harness 4 are respectively electrically connected to the conductive bumps 17 or the conductive connection grooves 18 on the same side. One end of the wire harness 4 far from the mother protection barrel 2 is electrically connected to a charging connector 10. The charging connector 10 can connect the device to the charger and the battery. There are arc-shaped protrusions on the inner wall of the conductive connection groove 18. The arc-shaped protrusions facilitate full contact with the conductive bumps 17, avoid poor contact caused by long-term use, and ensure the smoothness of the circuit conduction.

[0043] On both positions of the two fixed support seats 22, there are two symmetrically arranged split power-off slot plates 19 rotatably connected. The split power-off slot plates 19 can control the on-off of the circuit and avoid overcharging of the battery.

[0044] On the inner walls of the two split power-off slot plates 19 located on the same horizontal plane and far from the fixed support seats 22, there are respectively fixedly connected with conductive bumps 17 and conductive connection grooves 18. The conductive bumps 17 and the conductive connection grooves 18 located on the same horizontal plane are slidably connected. The conductive bumps 17 and the conductive connection grooves 18 are made of brass material, and the split power-off slot plates 19 are made of plastic material. The cooperation of the conductive bumps 17 and the conductive connection grooves 18 can realize the conduction of the charger circuit to supply power to the battery, and the on-off control of the circuit can be realized by sliding the conductive bumps 17 and the conductive connection grooves 18. The brass material makes the conduction performance of the circuit good, and the plastic material has an insulating effect, which can effectively avoid electric shock accidents or short-circuit accidents caused by leakage of electricity at the positions of the conductive bumps 17 and the conductive connection grooves 18.

[0045] Two symmetrically arranged limiting baffles 15 are fixedly connected to the surface opening position of the split power-off slot plate 19. A control slide base 13 is slidably connected to the surface opening position of the split power-off slot plate 19. Two symmetrically arranged limiting sliding claws 16 are fixedly connected to one side of the control slide base 13 close to the corresponding split power-off slot plate 19. The limiting sliding claws 16 are slidably connected to the limiting baffles 15 at the corresponding positions. The symmetrically arranged limiting baffles 15 slide with the limiting sliding claws 16 at the corresponding positions to adjust the position of the control slide base 13, so as to drive the split power-off slot plate 19 to rotate around the rotation control shaft 221, adjust the angle of the split power-off slot plate 19, and thus realize the on-off control of the conductive bumps 17 and the conductive connection grooves 18.

[0046] Both the limiting baffles 15 and the limiting sliding claws 16 are made of graphite material. Through holes 20 for on-off rotation are penetrated and opened at positions on both sides of the split power-off slot plate 19 close to the fixed support base 22. Limiting engaging grooves 21 are opened at the positions of the through holes 20 for on-off rotation on the same side. The graphite material has the effects of lubrication and wear resistance, which can effectively ensure the sliding of the control slide base 13 on the surface of the split power-off slot plate 19. The through holes 20 for on-off rotation ensure the rotation of the split power-off slot plate 19 at the position of the rotation control shaft 221, and the cooperation between the limiting engaging grooves 21 and the magnetic attracting pieces 222 can realize the control of the rotation of the split power-off slot plate 19.

[0047] An electromagnetic on-off structure is arranged between the split power-off slot plate 19 and the fixed support base 22. The installation side plate 220 has the function of supporting the rotation control shaft 221.

[0048] The fixed support base 22 includes two symmetrically arranged installation side plates 220. Two symmetrically arranged rotation control shafts 221 are fixedly connected between the two installation side plates 220. The rotation control shafts 221 are rotatably connected through the through holes 20 for on-off rotation. The electromagnetic on-off structure includes control elastic grooves 223 opened on one side of the rotation control shaft 221 close to the limiting engaging grooves 21.

[0049] A high-strength electromagnet 225 is fixedly connected to the inner wall of the control elastic groove 223 at the position of the mounting side plate 220. A magnetic attracting sheet 222 is attracted to the position of the high-strength electromagnet 225. The magnetic attracting sheet 222 is slidably connected to the inner wall of the control elastic groove 223. A separation spring 224 is fixedly connected between the magnetic attracting sheet 222 and the inner wall of the control elastic groove 223. The magnetic attracting sheet 222 is slidably connected to the inner wall of the limit engaging groove 21. The high-strength electromagnet 225 has a strong magnetic force in the state of rated current and can attract the magnetic attracting sheet 222, so that the magnetic attracting sheet 222 is located in the limit engaging groove 21 to limit the rotation of the split power-off slot plate 19 and keep it in a power supply state. When trickle charging occurs, the current in the circuit decreases, so the magnetic force of the high-strength electromagnet 225 decreases, and the suction force of the high-strength electromagnet 225 is less than the traction force of the separation spring 224, then the magnetic attracting sheet 222 is separated from the high-strength electromagnet 225. Under the action of the separation spring 224, the magnetic attracting sheet 222 disengages from the limit engaging groove 21, so that the split power-off slot plate 19 flips under the action of the power-off spring 11 to realize the power-off of the charger and the end of trickle charging.

[0050] A button slot hole 5 is penetrated and opened in the middle of the side of the sub-protection barrel 1 and the mother protection barrel 2 close to each other. A on-off control button 3 is slidably connected to the inner wall of the button slot hole 5. One end of the on-off control button 3 located in the sub-protection barrel 1 and the mother protection barrel 2 is fixedly connected with a rotating connection seat 9. Two symmetrically arranged linkage guide plates 12 are rotatably connected to both sides of the lower surface of the rotating connection seat 9. One end of the two linkage guide plates 12 far from the rotating connection seat 9 is rotatably connected to the corresponding control sliding seat 13. A power-off spring 11 is fixedly connected between the upper surface of the rotating connection seat 9 and the inner walls of the sub-protection barrel 1 and the mother protection barrel 2. When the on-off control button 3 is pressed, the control sliding seat 13 slides, and the split power-off slot plate 19 is pressed down, so that the conductive bump 17 and the conductive connection groove 18 cooperate to realize circuit conduction. The power-off spring 11 quickly rebounds when the high-strength electromagnet 225 becomes effective, so that the circuit is disconnected.

[0051] The working principle of this embodiment is as follows. When in use, connect one end of the charging connector 10 to the output end of the charger, and then connect the charging connector 10 at the end far 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;

[0052] When in use, pinch the two on-off control buttons 3 with one hand, so that the rotating connecting seat 9 moves 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 presses down, the control slide 13 and the limit slide claw 16 slide at the position of the limit baffle 15, and the two split power-off groove plates 19 on the same horizontal plane flip. At this time, the conductive bump 17 contacts the conductive connection groove 18 at the corresponding position, forming a charging path, and the electrical appliance or battery is charged. At this time, a relatively large current is maintained in the charger circuit, and the high-strength electromagnet 225 obtains a large current, generating a strong magnetic field, attracting and fixing the magnetic attracting piece 222. At this time, the magnetic attracting piece 222 is stuck at the position of the limit engaging groove 21 of the on-off rotating hole 20, so that the split power-off groove plate 19 is relatively fixed and cannot rotate. Release the on-off control button 3;

[0053] When the battery is fully charged and the trickle charging effect occurs, the current in the charger circuit decreases, so the high-strength electromagnet 225 cannot obtain enough electrical energy, and the magnetic field of the high-strength electromagnet 225 decreases, and it cannot effectively attract the magnetic attracting piece 222. Then the magnetic attracting piece 222 retracts under the action of the separation spring 224, and the magnetic attracting piece 222 cannot be stuck in the limit engaging groove 21 of the on-off rotating hole 20. Then, under the action of the power-off spring 11, the rotating connecting seat 9 rebounds, the linkage guide plate 12 deflects and displaces, the control slide 13 moves upward, the split power-off groove plate 19 flips upward, the conductive bump 17 and the conductive connection groove 18 are separated from each other, and the charging circuit is disconnected, and no trickle current is generated, which can effectively protect the battery. And when the electrical appliance or battery is unplugged during the charging process, there will also be a trickle current in the charging circuit, which will also cause the charging circuit to be disconnected and there is no current. Even if the charger is not unplugged from the power supply at the charging connector 10 position, there will be no short circuit or discharge, making the charger safer to use.

[0054] The above 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 overcharging of a battery, characterized in that, It includes symmetrically arranged sub-protection barrels (1) and a mother protection barrel (2), and two symmetrically arranged fixed support seats (22) are provided inside the sub-protection barrel (1) and the mother protection barrel (2); Two symmetrically arranged split power-off groove plates (19) are rotatably connected at the positions of the two fixed support seats (22); An electromagnetic on-off structure is provided between the split power-off groove plate (19) and the fixed support seat (22); Inner walls of the two split power-off groove plates (19) located on the same horizontal plane and away from the fixed support seat (22) are respectively fixedly connected with a conductive bump (17) and a conductive connection groove (18). The conductive bump (17) and the inner wall of the conductive connection groove (18) located on the same horizontal plane are slidably connected. The conductive bump (17) and the conductive connection groove (18) are made of brass material, and the split power-off groove plate (19) is made of plastic material; Two symmetrically arranged limit baffles (15) are fixedly connected at the opening positions on the surface of the split power-off groove plate (19). A control slide base (13) is slidably connected at the opening positions on the surface of the split power-off groove plate (19). Two symmetric limit sliding claws (16) are fixedly connected to one side of the control slide base (13) close to the corresponding split power-off groove plate (19), and the limit sliding claws (16) are slidably connected with the limit baffles (15) at the corresponding positions; Through holes for on-off rotation (20) are penetrated and opened at positions on both sides of the split power-off groove plate (19) close to the fixed support seat (22). A limit engaging groove (21) is opened at the position of the through holes for on-off rotation (20) on the same side; The fixed support seat (22) includes 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 shaft (221) is rotatably connected through the through hole for on-off rotation (20). The electromagnetic on-off structure includes a control elastic groove (223) opened on one side of the rotation control shaft (221) close to the limit engaging groove (21); A high-strength electromagnet (225) is fixedly connected to the inner wall of the control elastic groove (223) at the position of the mounting side plate (220). A magnetic attracting sheet (222) is attracted at the position of the high-strength electromagnet (225). The magnetic attracting sheet (222) is slidably connected with the inner wall of the control elastic groove (223). A separation spring (224) is fixedly connected between the magnetic attracting sheet (222) and the inner wall of the control elastic groove (223). The magnetic attracting sheet (222) is slidably connected with the inner wall of the limit engaging groove (21).

2. The device for preventing overcharging of a battery according to claim 1, characterized in that, Both the limit baffle (15) and the limit sliding claw (16) are made of graphite material.

3. A device for preventing overcharging of a battery according to claim 1, characterized in that, A button slot hole (5) is penetrated and opened in the middle of one side of the sub-protection barrel (1) and the mother protection barrel (2) close to each other. A on-off control button (3) is slidably connected to the inner wall of the button slot hole (5). One end of the on-off control button (3) located inside the sub-protection barrel (1) and the mother protection barrel (2) is fixedly connected with a rotating connection seat (9). Two symmetrically arranged linkage guide plates (12) are rotatably connected to both sides of the lower surface of the rotating connection seat (9). One end of the two linkage guide plates (12) away from the rotating connection seat (9) is rotatably connected to a control sliding seat (13) at the corresponding position. A power-off spring (11) is fixedly connected between the upper surface of the rotating connection seat (9) and the inner walls of the sub-protection barrel (1) and the mother protection barrel (2).

4. A device for preventing overcharging of a battery according to claim 1, characterized in that: Two symmetrically arranged fixed insertion blocks (7) are fixedly connected to both ends of the side of the sub-protection barrel (1) close to the mother protection barrel (2). Two fixed insertion slots (14) are opened at both ends of the side of the mother protection barrel (2) close to the fixed insertion block (7). The fixed insertion block (7) is slidably connected to the inner wall of the corresponding fixed insertion slot (14), and the fixed insertion block (7) and the inner wall of the corresponding fixed insertion slot (14) are fixedly connected by bolts. Installation limit slots (6) are penetrated and opened at the center positions of both ends of the sub-protection barrel (1) and the mother protection barrel (2).

5. The device for preventing overcharging of a battery according to claim 4, wherein Conductive wire bundles (4) are clamped and fixed at the positions of the installation limit slots (6) of the sub-protection barrel (1) and the mother protection barrel (2). The positive and negative poles of the conductive wire bundles (4) are electrically connected to the conductive bumps (17) or conductive connection grooves (18) on the same side respectively. One end of the conductive wire bundle (4) away from the mother protection barrel (2) is electrically connected to a charging connector (10).

6. The device for preventing overcharging of a battery according to claim 1, wherein, Fixed mounting plates (8) are fixedly connected to two parallel inner walls of the mother protection barrel (2), and the fixed support seats (22) are fixedly connected to the corresponding fixed mounting plates (8).

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