Anti-overcharge protection device for battery pack of electric vehicle

Abstract

The utility model discloses an anti-overcharge protection device for a battery pack of an electric vehicle, which belongs to the technical field of electricians and electronics, comprises a shell, and shutters are mounted on the outer walls of the front end and the rear end of the shell, and is characterized in that a sliding chute is mounted at the inner bottom of the shell, and a charging protector is connected to the inner wall of the sliding chute in a sliding manner; the left end and the right end of the charging protector are provided with a second connecting end and a first connecting end respectively, and the rectangular opening, the first connecting end, the second connecting end, the control panel, the motor, the first metal rod, the fourth metal plate, the first metal plate, the third metal plate, the second metal plate, the charging protector, the first signal lamp, the second signal lamp and other assemblies interact with one another. The charging state of the battery pack can be automatically monitored, after the battery pack is fully charged, a charging circuit is automatically cut off, it is guaranteed that the battery pack is not damaged due to overcharging, when the charging protector needs to be overhauled, the side door can be opened by opening the locking assembly, and therefore the charging protector is taken out, and the use convenience of the charging protector is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical engineering and electronics, and more specifically to an overcharge protection device for an electric vehicle battery pack. Background Art

[0002] After years of development, lithium-ion power batteries and battery packs have been widely used in various fields due to their advantages such as high safety and good cycle performance. At present, lithium-ion battery packs are generally charged in series, mainly because this series charging method has outstanding characteristics such as simple structure and low cost, and it is also easy to implement. However, due to the differences in capacity, internal resistance, attenuation characteristics, self-discharge and other performances between the single lithium-ion batteries in the battery pack, when the lithium-ion battery pack is charged in series, the single lithium-ion battery with the smallest capacity in the battery pack will be fully charged first. At this time, the other batteries are not fully charged. If the series charging continues, the fully charged single lithium-ion battery may be overcharged, resulting in a series of safety problems caused by excessive temperature.

[0003] The existing Chinese patent publication number CN210167824U is a charger protection device for charging a lithium-ion battery pack, comprising a shell, a circuit board, a transfer line socket, a transfer line, a charger connection socket, a power protection switch, an indicator light, a voltage monitoring meter, a current monitoring meter, a charging protector and two fans. The circuit board, the transfer line socket, the charger connection socket, the power protection switch, the indicator light, the voltage monitoring meter, the current monitoring meter, the charging protector and the two fans are all located inside the shell, and the transfer line socket, the power protection switch, the indicator light, the voltage monitoring meter and the current monitoring meter are located on the same side of the shell, and the charger connection socket is located on the other side of the shell opposite to the transfer line socket, the power protection switch, the indicator light, the voltage monitoring meter and the current monitoring meter.

[0004] However, the above device still has a problem that the entire charging device can be powered off by only providing a charging protector, and the specific power-off process cannot be known. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the utility model provides an electric vehicle battery pack overcharge protection device to solve the above-mentioned problems.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an electric vehicle battery pack overcharge protection device, comprising a shell, the outer walls of the front and rear ends of the shell are both equipped with shutters, the inner bottom of the shell is equipped with a slide groove, the inner wall of the slide groove is slidably connected with a charging protector, the left and right ends of the charging protector are respectively equipped with a connection end 2 and a connection end 1, the rear end outer wall of the shell is equipped with a side door through a plurality of combination pages, a locking assembly is installed between the side door and the shell, the side door and the outer wall of the left end of the shell are both provided with a rectangular opening, the side door and the outer wall of the shell near the rectangular opening are both provided with a dust shield assembly, a rectangular groove is provided inside the charging protector, and the rectangular groove Metal plate 2 and metal plate 3 are respectively installed on the inner walls at the left and right ends; a motor is installed on the outer wall of the front end of the charging protector; the output end of the motor passes through the inside of the rectangular groove, and a metal tube is installed on the output end of the motor; metal rod 1 and metal rod 2 are respectively installed on the outer walls of the metal tube; metal plate 1 is installed on the other end of metal rod 1; metal plate 4 is installed on the other end of metal rod 2; metal plate 4 is in contact with metal plate 3; metal plate 1 is in contact with metal plate 2; a control board is installed on the top of the charging protector; signal light 1 and signal light 2 are respectively installed on the outer wall of the left end of the shell; the control board is electrically connected to the motor, signal light 1 and signal light 2, respectively.

[0009] Preferably, the dust shield assembly includes rectangular blocks, two groups of the rectangular blocks are respectively installed on the outer wall of the shell near the front and rear ends of the rectangular opening, and the other two groups of the rectangular blocks are respectively installed on the outer wall of the side door near the front and rear ends of the rectangular opening, and a rotating shaft is installed between each two groups of the rectangular blocks, and a baffle is installed on the outer wall of the lower end of the rotating shaft.

[0010] Preferably, a torsion spring 1 is provided at the connection between the rotating shaft 1 and the rectangular block, and a groove is provided on the outer wall of the baffle.

[0011] Preferably, the locking assembly includes a second rotating shaft, which is fixedly mounted on the outer wall of the left end of the shell, and the outer wall of the second rotating shaft is rotatably connected to a limiting plate, and the inner wall of the limiting plate is in close contact with the outer wall of the side door.

[0012] Preferably, a second torsion spring is provided between the limit plate and the second rotating shaft, a limit block is installed on the outer wall of the side door, and the side wall of the limit block is in close contact with the side wall of the limit plate.

[0013] Preferably, a handle is installed on the top of the shell.

[0014] Preferably, a plurality of groups of supporting legs are evenly installed on the bottom of the shell.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the utility model provides an electric vehicle battery pack overcharge protection device, which has the following beneficial effects:

[0017] Through the interaction of the rectangular opening, connection end one, connection end two, control board, motor, metal tube, metal rod two, metal rod one, metal plate four, metal plate one, metal plate three, metal plate two, charging protector, signal light one and signal light two and other components, the charging status of the battery pack can be automatically monitored. When the battery pack is fully charged, the charging line is automatically cut off to ensure that the battery pack will not be damaged by overcharging. When the charging protector needs to be inspected, the locking component can be opened to open the side door, so that the charging protector can be taken out, which greatly improves the convenience of using the charging protector. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A structural schematic diagram of a preferred embodiment of a novel electric vehicle battery pack overcharge protection device provided by the utility model;

[0019] Figure 2 for Figure 1 A schematic diagram of the structure of the internal structure of the shell shown;

[0020] Figure 3 for Figure 1 The structural schematic diagram of the chute structure shown;

[0021] Figure 4 for Figure 1 An enlarged schematic diagram of part A is shown;

[0022] Figure 5 for Figure 2 An enlarged schematic diagram of part B is shown;

[0023] Figure 6 for Figure 2 An enlarged schematic diagram of part C is shown.

[0024] In the figure: 1. shell; 2. handle; 3. support leg; 4. shutter; 5. signal light 1; 6. signal light 2; 7. motor; 8. side door; 9. dust shield assembly; 91. rectangular block; 92. rotating shaft 1; 93. torsion spring 1; 94. baffle; 95. groove; 10. hinge; 11. connection end 1; 12. charging protector; 13. rectangular groove; 14. metal plate 1; 15. metal plate 2; 16. connection end 2; 17. control board; 18. slide; 19. locking assembly; 191. rotating shaft 2; 192. limit plate; 193. torsion spring 2; 194. limit block; 20. metal rod 1; 21. metal plate 3; 22. metal rod 2; 23. metal pipe; 24. metal plate 4. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-6 , the utility model provides a technical solution:

[0027] An electric vehicle battery pack overcharge protection device comprises a shell 1, wherein the outer walls at both ends of the front and rear of the shell 1 are both provided with shutters 4, the inner bottom of the shell 1 is provided with a slide groove 18, the inner wall of the slide groove 18 is slidably connected with a charging protector 12, the left and right ends of the charging protector 12 are respectively provided with a connection end 2 16 and a connection end 11, a side door 8 is provided on the rear end outer wall of the shell 1 through a plurality of combination pages 10, a locking assembly 19 is provided between the side door 8 and the shell 1, the side door 8 and the outer wall at the left end of the shell 1 are both provided with rectangular openings 25, the two groups of rectangular openings 25 are respectively aligned with the connection end 2 16 and the connection end 11, the side door 8 and the outer wall of the shell 1 near the rectangular opening 25 are both provided with dust shield assemblies 9, a rectangular groove 13 is provided inside the charging protector 12, and the inner walls at the left and right ends of the rectangular groove 13 are respectively provided with There are metal plate 2 15 and metal plate 3 21, the front end outer wall of the charging protector 12 is installed with a motor 7, the output end of the motor 7 passes through the inside of the rectangular groove 13, and the output end of the motor 7 is installed with a metal tube 23, the outer walls of the metal tube 23 are respectively installed with metal rod 1 20 and metal rod 2 22, the other end of the metal rod 1 20 is installed with a metal plate 14, the other end of the metal rod 2 22 is installed with a metal plate 4 24, the metal plate 4 24 is in contact with the metal plate 3 21, the metal plate 14 is in contact with the metal plate 2 15, a control board 17 is installed on the top of the charging protector 12, the left end outer wall of the shell 1 is respectively installed with a signal light 1 5 and a signal light 2 6, the control board 17 is electrically connected to the motor 7, the signal light 1 5 and the signal light 2 6, and the output end of the motor 7 is an insulator.

[0028] Furthermore, the dust shield assembly 9 includes rectangular blocks 91, two groups of rectangular blocks 91 are respectively installed on the outer wall of the shell 1 near the front and rear ends of the rectangular opening 25, and the other two groups of rectangular blocks 91 are respectively installed on the outer wall of the side door 8 near the front and rear ends of the rectangular opening 25. A rotating shaft 92 is installed between each two groups of rectangular blocks 91, and a baffle 94 is installed on the outer wall at the lower end of the rotating shaft 92, and the baffle 94 completely blocks the rectangular opening 25.

[0029] Furthermore, a torsion spring 93 is provided at the connection between the rotating shaft 92 and the rectangular block 91, and a groove 95 is provided on the outer wall of the baffle 94. When the connection end 11 and the connection end 16 are needed, the baffle 94 can be pushed outward. When the connection end 11 and the connection end 16 are not used, the baffle 94 automatically resets under the action of the torsion spring 93, and the rectangular opening 25 is blocked to prevent external dust from entering the connection end 11 and the connection end 16. The setting of the groove 95 makes it convenient for fingers to open the baffle 94.

[0030] Furthermore, the locking assembly 19 includes a second rotating shaft 191, which is fixedly mounted on the outer wall of the left end of the outer shell 1. The outer wall of the second rotating shaft 191 is rotatably connected to a limiting plate 192. The inner wall of the limiting plate 192 is in contact with the outer wall of the side door 8. By rotating the limiting plate 192 to make it leave the outer wall of the side door 8, the side door 8 can be opened, thereby removing the charging protector 12 from the inside of the outer shell 1.

[0031] Furthermore, a torsion spring 193 is provided between the limit plate 192 and the second rotating shaft 191, and a limit block 194 is installed on the outer wall of the side door 8. The side wall of the limit block 194 is in close contact with the side wall of the limit plate 192. The setting of the torsion spring 193 facilitates the automatic resetting of the limit plate 192 after rotation, and the setting of the limit block 194 is to limit the limit plate 192 from rotating excessively.

[0032] Furthermore, a handle 2 is installed on the top of the housing 1, and the arrangement of the handle 2 makes it convenient for the user to take the battery pack overcharge protection device.

[0033] Furthermore, a plurality of groups of supporting legs 3 are evenly installed at the bottom of the shell 1, and anti-slip grooves are provided at the bottom of the supporting legs 3. The arrangement of the supporting legs 3 prevents the shell 1 from directly contacting the ground, thereby preventing the shell 1 from contacting with liquid and affecting the charging protector 12 inside the shell 1.

[0034] Working principle: When the electric vehicle battery pack overcharge protection device is needed, the dust shielding components 9 on the outer wall of the housing 1 and the outer wall of the side door 8 are opened respectively, and then one end of a set of connecting wires is inserted into the connecting terminal 1 11 through the rectangular opening 25 and the other end is electrically connected to the power supply, and one end of another set of connecting wires is inserted into the connecting terminal 2 16 through the rectangular opening 25 and the other end is electrically connected to the battery pack to be charged. At this time, the control board 17 controls the output end of the motor 7 to rotate, and the output end of the motor 7 drives the metal plate 4 24 and the metal plate 1 14 to contact the metal plate 3 21 and the metal plate 2 15 respectively through the metal tube 23, the metal rod 22 and the metal rod 1 20, so that The charging protector 12 starts to work, and the signal light 15 lights up. When the charging protector 12 detects that the battery pack is fully charged, the control board 17 controls the output end of the motor 7 to rotate, and the output end of the motor 7 drives the metal plate 4 24 and the metal plate 1 14 to leave the metal plate 3 21 and the metal plate 2 15 respectively through the metal tube 23, the metal rod 22 and the metal rod 1 20, thereby forming a circuit break and stopping charging. At this time, the signal light 2 6 lights up, and the user can understand the charging status according to the prompt of the signal light. When the charging protector 12 needs to be repaired, the locking assembly 19 can be opened to open the side door 8, so that the charging protector 12 can be taken out.

[0035] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. An electric vehicle battery pack overcharge protection device, comprising a housing (1), wherein the outer walls at both ends of the housing (1) are provided with shutters (4), characterized in that: The inner bottom of the housing (1) is provided with a slide groove (18), the inner wall of the slide groove (18) is slidably connected with a charging protector (12), the left and right ends of the charging protector (12) are respectively provided with a second connection end (16) and a first connection end (11), the rear end outer wall of the housing (1) is provided with a side door (8) through a plurality of assembly pages (10), a locking assembly (19) is installed between the side door (8) and the housing (1), the side door (8) and the left end outer wall of the housing (1) are both provided with a rectangular opening (25), the side door (8) and the outer wall of the housing (1) near the rectangular opening (25) are both provided with a dust shield assembly (9), the charging protector (12) is provided with a rectangular groove (13), the left and right inner walls of the rectangular groove (13) are respectively provided with a second metal plate (15) and a third metal plate (21), the front end of the charging protector (12) is provided with a second metal plate (15) and a third metal plate (21), A motor (7) is mounted on the outer wall of the end, the output end of the motor (7) penetrates into the rectangular groove (13), and a metal tube (23) is mounted on the output end of the motor (7), a metal rod (20) and a metal rod (22) are mounted on the outer wall of the metal tube (23), a metal plate (14) is mounted on the other end of the metal rod (20), a metal plate (24) is mounted on the other end of the metal rod (22), the metal plate (24) is in close contact with the metal plate (21), the metal plate (14) is in close contact with the metal plate (15), a control board (17) is mounted on the top of the charging protector (12), a signal light (5) and a signal light (6) are mounted on the outer wall of the left end of the housing (1), and the control board (17) is electrically connected to the motor (7), the signal light (5) and the signal light (6), respectively.

2. The electric vehicle battery pack overcharge protection device according to claim 1, characterized in that: The dust shield assembly (9) comprises rectangular blocks (91), two groups of the rectangular blocks (91) are respectively mounted on the outer wall of the housing (1) near the front and rear ends of the rectangular opening (25), and another two groups of the rectangular blocks (91) are respectively mounted on the outer wall of the side door (8) near the front and rear ends of the rectangular opening (25), a rotating shaft (92) is mounted between each two groups of the rectangular blocks (91), and a baffle (94) is mounted on the outer wall of the lower end of the rotating shaft (92).

3. The electric vehicle battery pack overcharge protection device according to claim 2, characterized in that: A torsion spring (93) is provided at the connection between the rotating shaft (92) and the rectangular block (91), and a groove (95) is provided on the outer wall of the baffle (94).

4. The electric vehicle battery pack overcharge protection device according to claim 1, characterized in that: The locking assembly (19) comprises a second rotating shaft (191), wherein the second rotating shaft (191) is fixedly mounted on the outer wall of the left end of the housing (1), and the outer wall of the second rotating shaft (191) is rotatably connected to a limiting plate (192), and the inner wall of the limiting plate (192) is in close contact with the outer wall of the side door (8).

5. The electric vehicle battery pack overcharge protection device according to claim 4, characterized in that: A second torsion spring (193) is provided between the limit plate (192) and the second rotating shaft (191); a limit block (194) is installed on the outer wall of the side door (8); and the side wall of the limit block (194) is in close contact with the side wall of the limit plate (192).

6. The electric vehicle battery pack overcharge protection device according to claim 1, characterized in that: A handle (2) is installed on the top of the housing (1).

7. The electric vehicle battery pack overcharge protection device according to claim 1, characterized in that: A plurality of groups of supporting legs (3) are evenly mounted on the bottom of the housing (1).

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