Electric shock prevention repair structure and battery pack

Abstract

This application discloses an electric shock-proof repair structure and battery pack, which includes a main body including a low-voltage control circuit, a main circuit, and a relay, a repair cover attached to the main body, a conduction switch connected in series to the low-voltage control circuit, and the conduction switch including a plug and a socket, the plug and socket being respectively attached to the main body and the repair cover, when the plug and socket are inserted and conducting, the low-voltage control circuit is conducting, the relay is energized and attracted, and the main circuit is conducting, when the plug and socket are disconnected, the low-voltage control circuit is disconnected, and the relay is disconnected, thereby cutting off power to the main circuit.

Description

[Technical Field]

[0001] This application claims priority to a Chinese patent application bearing application number 202310027277.2 filed with the China Patent Office on January 9, 2023, and a Chinese patent application bearing application number 202320075184.2 filed with the China Patent Office on January 9, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of battery packs, and more particularly to an electric shock-proof repair structure and a battery pack. [Background technology]

[0003] Currently, battery packs are usually fixed inside the vehicle body, and to facilitate repairs, a repair port is provided. This eliminates the need to remove the battery pack from the vehicle for repair; instead, it is possible to manually inspect the battery pack directly through the repair port at the bottom of the vehicle body, identify damaged parts, and repair them.

[0004] When repairing a vehicle battery pack, it is necessary to first cut off the current between the battery pack and the vehicle to ensure the safety of the repair technician and prevent electric shock. However, in actual operation, when the repair technician unplugs the MSD plug, there is usually no instruction to confirm that the battery pack is completely cut off, so the battery pack may still be in a live or partially cut off state. If there is still current in the battery pack, if the repair technician's hand touches a charged part, such as the copper bus inside the battery pack, electric shock may occur, potentially resulting in irreparable damage. Summary of the Invention [Problem to be solved by the invention]

[0005] To overcome at least one of the drawbacks of the prior art, the present application provides a repair structure and battery pack that prevent electric shock, which solves the problem of electric shock for repair workers. Before removing the MSD plug, the repair cover is removed and the low-voltage control circuit is disconnected, controlling the relay to disconnect, thereby cutting off the power to the main circuit of the battery pack. Therefore, when the MSD plug is removed, charged components such as the copper bus inside the battery pack are in a power-off state, preventing the risk of electric shock. [Means for solving the problem]

[0006] In a first aspect, an embodiment of the present application provides a shock-proof repair structure, which includes a structural body having a low-voltage control circuit, a main circuit, and a relay, a repair cover attached to the structural body, and a conduction switch connected in series to the low-voltage control circuit, and the conduction switch includes a plug and a socket assembled to the structural body and the repair cover, respectively, and when the plug is inserted into the socket to conduct, the low-voltage control circuit conducts, the relay is energized and closed, and the main circuit conducts, and when the plug and the socket are disconnected, the low-voltage control circuit is disconnected, and the relay is disconnected, and the main circuit is cut off.

[0007] By adopting the above-mentioned aspect, it is possible to achieve the effect of cutting off the current to the internal main circuit when the structural body and the repair cover are separated, and it is possible to effectively avoid the risk of electric shock during repairs.

[0008] In a second aspect, embodiments of the present application provide a battery pack using an electric shock-proof repair structure.

[0009] By adopting the above-described embodiment, safety during repair of the battery pack can be improved, and the problem of repair workers receiving electric shock can be avoided. [Effects of the Invention]

[0010] 1. By assembling the socket and plug of the conduction switch to the repair cover and the main structure, respectively, the socket and plug are separated when the repair cover is opened, realizing a mechanical power cutoff protection function.

[0011] 2. The conduction switch is connected in series to the low-voltage control circuit, and the relay controls the conduction state of the main circuit, thereby realizing an electrical power interruption protection function.

[0012] 3. Dual protection functions, including mechanical and electrical protection, improve the safety of repair workers and prevent electric shock during repairs.

[0013] 4. By configuring the system so that the entire power supply is automatically shut off when the repair cover is removed, manual power shutoff is no longer necessary, simplifying the work steps and optimizing the repair process. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic diagram of an electric shock prevention repair structure according to an embodiment of the present application; [Figure 2] 1 is a schematic diagram of an exploded structure of a part of a conduction switch according to an embodiment of the present application. [Figure 3] 1 is a schematic diagram of an exploded structure of a conduction switch according to an embodiment of the present application; [Figure 4] 1 is a schematic diagram of a vertical cross-sectional structure of a conduction switch according to an embodiment of the present application; [Figure 5] 1 is a structural schematic diagram of a battery pack according to an embodiment of the present invention; [Figure 6] 1 is a schematic diagram of the circuit principle of the electric shock prevention repair structure according to an embodiment of the present application; [Figure 7] 1 is a schematic diagram of a repair structure for preventing electric shock in a battery pack according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0015] In the description of this application, the orientations or positional relationships indicated by terms such as "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" are orientations or positional relationships shown based on the drawings, and are intended to facilitate and simplify the description of this application, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be configured, or operate in a particular orientation, and should not be construed as limiting this application.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terms used herein are for the purpose of describing specific examples only and are not intended to be limiting of the present application.

[0017] In one embodiment, the main circuit has a battery module, an MSD plug, and a relay connected in series, and the low-voltage control circuit has a BMS, a conduction switch, and a relay connected in series, where two leads connected to the normally open contacts of the relay are connected in series to the main circuit, and the other two leads of the relay are connected in series to the low-voltage control circuit.

[0018] By adopting the above-described embodiment and using a conduction switch to control the conduction state of the low-voltage control circuit, the conduction state of the relay contacts can be changed, and the interruption state of the main circuit can be controlled, thereby realizing the effect of automatic interruption of the main circuit before repair.

[0019] In one embodiment, the socket comprises a socket insulating holder having two accommodating chambers, two metal terminals assembled in the accommodating chambers of the socket insulating holder, and two wires passing through the socket insulating holder into the accommodating chambers and connected to the metal terminals, wherein one end of the metal terminals is flush with the surface of the socket insulating holder and the other end is connected to the wires passing through the socket insulating holder into the accommodating chambers.

[0020] By adopting the above embodiment, the low voltage control circuit can be kept in a disconnected state by the two separated metal terminals in the socket.

[0021] In one embodiment, the metal terminal has an insertion groove at one end configured to receive a plug.

[0022] By adopting the above-mentioned embodiment, the effect of stabilizing electrical continuity after the metal terminal and the plug are inserted is improved.

[0023] In one embodiment, the socket insulating holder comprises a first insertion portion located at one end of the socket insulating holder and configured to have the plug inserted therein, a first assembly portion located at the other end of the socket insulating holder and extending in two opposing directions on the side adjacent to the first insertion portion, and a wiring portion located on the side adjacent to the first insertion portion and configured to have a wire pass through.

[0024] By adopting the above-described embodiment, the mounting stability of the socket insulating holder itself is improved.

[0025] The plug further comprises a plug insulating holder having a pin chamber (343) and a conductive pin assembled in the pin chamber and configured to be connected to the socket to realize electrical continuity of the socket.

[0026] By adopting the above-mentioned aspect, the plug structure can achieve the conductive effect of the socket.

[0027] In one embodiment, the plug insulating holder comprises a second insertion portion located at one end of the plug insulating holder, recessed into the plug insulating holder to form an insertion chamber configured to receive the first insertion portion, and a second assembly portion located at the other end of the plug insulating holder and extending in two opposing directions adjacent to the second insertion portion.

[0028] By adopting the above-described embodiment, the plug insulating holder can improve the mounting stability of itself and the insertion stability into the socket.

[0029] In one embodiment, the conductive pin has both ends passing through the pin chamber and into the insertion chamber, and is inserted into the insertion groove, and is configured to electrically connect two metal terminals in the socket.

[0030] By adopting the above-described embodiment, the metal terminal can be made conductive via the conductive pin, realizing current flow through the socket, and further closing the low-voltage control circuit to make it conductive, energizing the relay to close the contacts, and thereby energizing the main circuit.

[0031] In one embodiment, the first assembly part and the second assembly part are both provided with mounting holes through which fixing members pass.

[0032] By adopting the above-described embodiment, the socket and the plug are fixed and assembled by the fixing member, improving the assembly stability.

[0033] 1 to 4, the present application discloses a shock-preventing repair structure, which includes a structural body 1, a conductive switch 3, and a repair cover 2. The structural body 1 is a live body structure to be repaired, and the repair cover 2 is a cover body assembled to the structural body 1. The area of ​​the repair cover 2 is usually smaller than the area of ​​the surface on which the structural body 1 is located. The repair cover 2 and the structural body 1 are detachably connected, including but not limited to, a screw connection, a mechanical engagement connection, or a snap-on type connection.

[0034] As shown in Figure 6, the main body 1 includes a low-voltage control circuit 11, a main circuit 12, and a relay 13. In this embodiment, a battery module 121, an MSD plug 122, and a relay 13 are connected in series to the main circuit 12, and a BMS 111, a conduction switch 3, and a relay 13 are connected in series to the low-voltage control circuit 11. Two leads connected to normally open contacts of the relay 13 are connected in series to the main circuit 12, and the other two leads of the relay 13 are connected in series to the low-voltage control circuit 11. The conduction state of the low-voltage control circuit 11 is controlled using the conduction switch 3 to change the conduction state between the contacts of the relay 13, which in turn controls the interruption state of the main circuit 12, thereby achieving the automatic electrical interruption effect of the main circuit 12 before repair.

[0035] The conduction switch 3 is connected in series to the low-voltage control circuit 11 and includes a plug and a socket. The plug and the socket are attached to the main body 1 and the repair cover 2, respectively, and their positions on the main body 1 and the repair cover 2 are interchangeable. Therefore, when the repair cover 2 is detached from the main body 1, the low-voltage control circuit 11 is disconnected by the separation of the plug and the socket, and the relay 13 cannot be energized, thereby interrupting the main circuit 12. Specifically, when the plug is inserted into the socket and electrical conduction is established, the low-voltage control circuit 11 is energized, energizing the relay 13 and establishing electrical conduction in the main circuit 12. When the plug and the socket are disconnected, the low-voltage control circuit 11 is disconnected, the relay 13 is disconnected, and electrical conduction in the main circuit 12 is interrupted. Therefore, when the main body 1 and the repair cover 2 are separated, a mechanical interruption of the internal main circuit 12 can be achieved, effectively avoiding the risk of electric shock during repairs.

[0036] By utilizing the electrical and mechanical cutoff effects to provide double protection against electric shock during repairs, after-sales personnel can be prevented from being electrified while making repairs, ensuring the safety of personnel's lives.

[0037] 3 and 4, the socket specifically includes a socket insulating holder 31, two metal terminals 32, and two wires 33. The socket insulating holder 31 includes a first insertion portion 311, a first assembly portion 312, and a wiring portion 313. The first insertion portion 311 is located at one end of the socket insulating holder 31 and is configured to be inserted into a plug. The first insertion portion 311 has two receiving chambers 314 that are concave inward and do not communicate with each other. The receiving chambers 314 are cylindrical in shape, but may have other shapes in other embodiments. A columnar metal terminal 32 is installed in each of the two receiving chambers 314. The receiving chambers 314 have narrow openings, and the lower ends of the metal terminals 32 have narrow portions. The ends of the metal terminals 32 where the narrow portions are located are inserted into the receiving chambers 314 until the narrow portions of the lower ends of the metal terminals 32 are flush with the surface of the socket insulating bracket 31. At this time, a wire mounting space remains in the narrow opening of the receiving chambers 314. The connecting portion 313 is located adjacent to the first inserting portion 311 and has two through holes communicating with the wire mounting space. Two wires 33 are passed through the two through holes, respectively, and connected to the narrow portions of the lower ends of the metal terminals 32 to connect the socket to the low-voltage control circuit 11 in series. The two separated metal terminals 32 of the socket can be kept disconnected from the low-voltage control circuit 11.

[0038] The first assembly part 312 is located at the end of the socket insulator holder 31 away from the first insert part 311, and the first assembly part 311 extends in two opposite directions adjacent to the first insert part 311. The first assembly parts 312 extending on both sides of the socket insulator holder 31 are provided with mounting holes 4, and fixing members 5 can be provided to pass through the mounting holes 4 to fix the socket to the structural body 1 or the repair cover 2. In this embodiment, the fixing members 5 are screws, but of course they do not have to be screws. In other embodiments, the fixing of the first assembly part 312 can be achieved by means of, but not limited to, riveting, welding, adhesive bonding, a snap-fit ​​joint, or integral connection.

[0039] An insertion groove 321 is provided at the upper end of the metal terminal 32. The insertion groove 321 is a concave columnar groove, which improves the stability of conduction after the metal terminal 32 is inserted into the plug. In other embodiments, the shape of the insertion groove 321 may not be columnar, but this embodiment is not specifically limited to this shape.

[0040] The plug includes a plug insulator holder 34 and a conductive pin 35. The plug insulator holder 34 includes a second insertion portion 341 and a second assembly portion 342. The second insertion portion 341 is located at one end of the plug insulator holder 34 and is recessed into the plug insulator holder 34 to form a plug chamber 344. The shape of the plug chamber 344 matches that of the first insertion portion 311, ensuring stable insertion between the plug chamber 344 and the first insertion portion 311. A U-shaped pin chamber 343 is provided within the plug insulator holder 34, both ends of which communicate with the pin chamber 344. The conductive pin 35 is assembled within the pin chamber 343, so that the conductive pin 35 is also U-shaped. Both ends of the conductive pin 35 penetrate from both ends of the pin chamber 343 into the plug chamber 344, and both ends of the conductive pin 35 are lower than the edges of the plug chamber 344. In other embodiments, the pin chamber 343 and the conductive pin 35 may have other shapes and are not specifically limited in this embodiment.

[0041] The second assembly part 342 is located at the end of the plug insulator holder 34 away from the second insertion part 341, and the second assembly part 341 extends in two opposite directions adjacent to the second insertion part 341. The second assembly parts 342 extending on both sides of the plug insulator holder 34 are provided with mounting holes 4, and fixing members 5 can be provided to pass through the mounting holes 4 to fix the plug to the structural body 1 or the repair cover 2. In this embodiment, the fixing members 5 are screws, but they may not be screws. In other embodiments, the fixing of the first assembly part 312 can be by means of, but not limited to, riveting, welding, adhesive bonding, snap-on connection, or integral connection.

[0042] It is not possible to attach both the plug and the socket to the main body 1 or the repair cover 2; the plug and the socket must be attached to the main body 1 and the repair cover 2 separately, and must be set to be plugged in when in use. The specific positions of the plug and the socket are not limited, and the positions of the two can be interchanged.

[0043] When the plug is inserted into the socket, the first insertion portion 311 is inserted into the insertion chamber 344 of the second insertion portion 341, and both ends of the conductive pin 35 are inserted into the two metal terminals 32 to connect the two metal terminals 32, thereby conducting the low-voltage control circuit 11, energizing the relay 13, connecting the contacts of the relay 13, and further controlling the current flow through the main circuit 12.

[0044] 1, 5, 6, and 7, the present application further relates to a battery pack 6 including at least one battery module 121, a frame 61, and an electric shock-preventing repair structure. The structural body 1 in the electric shock-preventing repair structure is a battery cover plate between the frames 61, and the repair cover 2 is attached to the battery cover plate. A round cushion 62 is provided between the battery cover plate and the repair cover 2 to isolate the contact portion between the battery cover plate and the repair cover 2 so as to achieve a stable connection. The cushion 62 is provided with a round perforation configured to pass through a fixing member 5 for fixing and connecting the battery cover plate and the repair cover 2.

[0045] In this embodiment, the socket of the conduction switch 3 is attached to a cross member inside the battery cover plate, and the plug of the conduction switch 3 is attached to the repair cover 2. When the repair cover 2 is connected to the battery cover plate, the socket and plug are connected, the low-voltage control circuit 11 is conductive, the relay 13 is energized, and the main circuit 12 is energized, thereby energizing the battery pack 6. On the other hand, when a repair worker needs to repair the battery pack 6, he removes the fixing part 5 between the battery cover plate and the repair cover 2, and then the repair cover 2 is detached from the battery cover plate, thereby separating the socket and plug, disconnecting the low-voltage control circuit 11, and de-energizing the relay 13, resulting in separation between the contacts and de-energizing the battery pack 6. After de-energization, when a repair worker removes the MSD plug 122 inside the battery pack 6, all charged parts inside the battery pack 6, such as copper buses, that the repair worker touches will all be de-energized, thereby serving as repair protection to prevent electric shock. To further improve the effectiveness of preventing electric shock, the MSD plug 122 is manufactured as a separate manual repair switch MSD that can be quickly inserted and removed for replacement. Therefore, after the MSD plug 122 is pulled out, the main circuit 12 of the battery pack 6 is completely disconnected, preventing current conduction phenomena such as circuit failure.

[0046] From the above, the electric shock prevention repair structure and battery pack 6 provided in the present application have the following technical effects.

[0047] 1. By assembling the socket and plug of the conduction switch 3 to the repair cover 2 and the structural body respectively, the socket and plug are separated when the repair cover 2 is opened, realizing a mechanical power cut-off protection function.

[0048] 2. The conduction switch 3 is connected in series to the low-voltage control circuit 11, and the relay 13 controls the conduction state of the main circuit 12, thereby realizing an electrical power interruption protection function.

[0049] 3. Dual protection functions, including mechanical and electrical protection, improve the safety of repair workers and prevent electric shock during repairs.

[0050] 4. By configuring the system so that the entire power supply is automatically shut off when the repair cover 2 is removed, manual power shutoff is no longer necessary, simplifying the work steps and optimizing the repair process. [Explanation of symbols]

[0051] 1. Main structure 11 Low-voltage control circuit 111 BMS 12 Main Circuit 121 Battery Module 122 MSD plug 13 Relay 2 Repair Cover 3 Conduction Switch 31 Socket insulating holder 311 First insertion part 312 1st assembly section 313 Wiring section 314 Containment Room 32 Metal terminal 321 Insertion groove 33 Wire 34 Plug insulator holder 341 Second insertion part 342 2nd Assembly Department 343 Pin Room 344 Insertion Room 35 Conductive pin 4 mounting holes 5 Fixing member 6 Battery pack 61 frames 62 cushion pad

Claims

1. A repair structure for preventing electric shock, A structural body (1) provided with a low-voltage control circuit (11), a main circuit (12), and a relay (13); a repair cover (2) attached to the structural body (1); a conduction switch (3) connected in series to the low-voltage control circuit (11); Equipped with The conduction switch (3) comprises a plug and a socket respectively assembled to the structural body (1) and the repair cover (2). When the plug is inserted into the socket to conduct electricity, the low-voltage control circuit (11) is conducted, the relay (13) is energized, and the main circuit (12) is conducted. When the plug and the socket are disconnected, the low-voltage control circuit (11) is disconnected, the relay (13) is disconnected, and the main circuit (12) is cut off. Repair structure to prevent electric shock.

2. The main circuit (12) has a battery module (121), an MSD plug (122), and the relay (13) connected in series, The low-voltage control circuit (11) has a BMS (111), the conduction switch (3), and the relay (13) connected in series, Here, two leads of the relay (13) connected to the normally open contacts are connected in series to the main circuit (12), and the other two leads of the relay (13) are connected in series to the low-voltage control circuit (11).

2. The electric shock-proof repair structure according to claim 1.

3. The socket is a socket insulating holder (31) having two receiving chambers (314); Two metal terminals (32) assembled in the receiving chamber (314) of the socket insulating holder (31); Two wires (33) that penetrate the socket insulating holder (31), enter the receiving chamber (314), and are connected to the metal terminals (32); Equipped with Here, one end of the metal terminal (32) is flush with the surface of the socket insulating holder (31), and the other end is connected to the wire (33) that penetrates through the socket insulating holder (31) and enters the receiving chamber (314).

2. The electric shock-proof repair structure according to claim 1.

4. The metal terminal (32) has an insertion groove (321) at one end into which the plug is inserted.

4. The electric shock-proof repair structure according to claim 3.

5. The socket insulating holder (31) is a first insertion portion (311) located at one end of the socket insulating holder (31) and configured to receive the plug; a first assembly portion (312) located at the other end of the socket insulating holder (31) and adjacent to the first insertion portion (311), the first assembly portion (312) extending in two opposite directions; a wiring portion (313) located adjacent to the first insertion portion (311) and configured to have the wire (33) pass through; Equipped with 5. The electric shock-proof repair structure according to claim 4.

6. The plug is a plug insulating holder (34) having a pin chamber (343); a conductive pin (35) assembled in the pin chamber (343) and configured to be connected to the socket to realize electrical continuity of the socket; Equipped with 6. The electric shock-proof repair structure according to claim 5.

7. The plug insulating holder (34) a second insertion portion (341) located at one end of the plug insulator holder (34) and recessed into the plug insulator holder (34) to form an insertion chamber (344) into which the first insertion portion (311) is inserted; a second assembly portion (342) located at the other end of the plug insulating holder (34) and extending in two opposite directions on a side adjacent to the second insertion portion (341); Equipped with 7. The electric shock-proof repair structure according to claim 6.

8. The conductive pin (35) is configured such that both ends thereof pass through the pin chamber (343) and enter the insertion chamber (344) to be inserted into the insertion groove (321), and to electrically connect the two metal terminals (32) in the socket.

8. The electric shock-proof repair structure according to claim 7.

9. The first assembly portion (312) and the second assembly portion (342) are both provided with mounting holes (4) through which fixing members (5) are inserted.

8. The electric shock-proof repair structure according to claim 7.

10. A battery pack using the electric shock-preventing repair structure according to any one of claims 1 to 9.

Images