Maintenance switch, battery pack and vehicle

Abstract

The utility model discloses a maintenance switch, a battery pack and a vehicle, and the maintenance switch comprises a socket which comprises a first housing, a main loop contact terminal, a secondary loop contact terminal and a locking pin, the first housing defines a first built-in space, the main loop contact terminal and the secondary loop contact terminal are arranged in the first built-in space, and the locking pin is arranged in the first housing; the plug comprises a second shell, a main loop contact pin, a secondary loop contact pin and a locking buckle, a second built-in space is defined by the second shell, the main loop contact pin and the secondary loop contact pin are arranged in the second built-in space, and the locking buckle is arranged in the second shell; and when the secondary loop contact pin is separated from the secondary loop contact terminal and the main loop contact pin is still embedded with the main loop contact terminal, one end, far away from the locking pin, of the locking buckle is locked at a second locking position of the second shell. According to the maintenance switch, the battery pack and the vehicle provided by the embodiment of the invention, through the matching relationship of the locking pin and the locking buckle, the safety risk is reduced while the performance life of a high-voltage part is prevented from being lost.

Description

Technical Field

[0001] The present application relates to the technical field of high-voltage control of electric vehicles, and in particular to a maintenance switch, a battery pack and a vehicle. Background Art

[0002] Before new energy vehicles are repaired, it is usually necessary to disconnect the high-voltage circuit. The high-voltage circuit is disconnected by directly disconnecting the high-voltage relay power supply with a mechanical switch. Directly disconnecting the circuit while the high-voltage components are in the working state can easily affect the service life of the high-voltage components. When the high-voltage interlock detection circuit of the vehicle controller is connected to the switch, when the switch is disconnected, the detection circuit detects the interlock fault signal, sends a power-off command, and gradually shuts down the high-voltage components. When the battery management system detects that the discharge current is less than 5A, the high-voltage circuit is cut off. This solution has problems such as the interlock fault signal is easy to be misdetected and the high voltage is applied again during the detection process. At present, there is no switch device or disconnection method that can protect operators and not damage the performance and life of electrical components before new energy vehicles are repaired. Utility Model Content

[0003] The embodiments of the present application provide a maintenance switch, a battery pack and a vehicle, which first utilize a secondary circuit to carry out a normal high-voltage process and then delay disconnecting the main circuit, thereby avoiding loss of performance life of high-voltage components and reducing safety risks.

[0004] On the one hand, an embodiment of the present application provides a maintenance switch, including: a socket, including a first shell, a main circuit contact terminal, a secondary circuit contact terminal and a locking pin, the first shell encloses a first built-in space, the main circuit contact terminal and the secondary circuit contact terminal are arranged in the first built-in space, and the locking pin is arranged on the first shell; a plug, including a second shell, a main circuit pin, a secondary circuit pin and a locking buckle, the second shell encloses a second built-in space, the main circuit pin and the secondary circuit pin are arranged in the second built-in space, and the locking buckle is arranged on the second shell; the plug and the socket are engaged with each other, the main circuit pin is embedded in the main circuit contact terminal, the secondary circuit pin is embedded in the secondary circuit contact terminal, the locking pin is embedded in the locking buckle and the locking buckle slides along the engagement direction of the plug and the socket; when the secondary circuit pin is separated from the secondary circuit contact terminal and the main circuit pin is still engaged with the main circuit contact terminal, the locking buckle is locked to the second locking position of the second shell away from one end of the locking pin.

[0005] According to one aspect of an embodiment of the present application, the first shell is embedded in the second shell, the locking pin is arranged on the side of the first shell away from the first built-in space, and the locking buckle is arranged on the side of the second shell close to the second built-in space; or the second shell is embedded in the first shell, the locking pin is arranged on the side of the first shell close to the first built-in space, and the locking buckle is arranged on the side of the second shell away from the second built-in space.

[0006] According to one aspect of the embodiment of the present application, the length of the first effective contact portion between the main circuit pin and the main circuit contact terminal is greater than the length of the second effective contact portion between the secondary circuit pin and the secondary circuit contact terminal.

[0007] According to one aspect of the embodiments of the present application, the length of the main circuit pin is greater than the length of the secondary circuit pin; or the length of the main circuit contact terminal is greater than the length of the secondary circuit contact terminal.

[0008] According to one aspect of the embodiment of the present application, when the secondary circuit pin and the secondary circuit contact terminal, and the main circuit pin and the main circuit contact terminal are both kept engaged, the locking buckle is locked at the first locking position of the second shell away from one end of the locking pin.

[0009] According to one aspect of an embodiment of the present application, the locking buckle extends toward the second shell at one end away from the locking pin and close to the second shell to form a limit block, and the second shell also includes a limit piece arranged at the first locking position and a cushion block arranged between the limit piece and the second shell, and the limit block is embedded in the limit piece; by pulling out the cushion block from between the limit piece and the second shell, the limit block is disengaged from the limit piece, and the locking buckle is unlocked from the first locking position.

[0010] According to one aspect of the embodiment of the present application, the direction in which the cushion block is withdrawn from between the limiting member and the second shell is different from the engagement direction of the plug and the socket.

[0011] According to one aspect of the embodiments of the present application, the second shell or the first shell is provided with an operating hole, through which the locking buckle is exposed; the locking buckle is pressed through the operating hole, the locking buckle is disengaged from the locking pin, and the secondary circuit pin is separated from the secondary circuit contact terminal, and the main circuit pin is separated from the main circuit contact terminal.

[0012] On the other hand, an embodiment of the present application provides a battery pack that uses any of the maintenance switches described above.

[0013] On the other hand, an embodiment of the present application provides a vehicle, comprising a battery pack as described above.

[0014] The maintenance switch, battery pack and vehicle provided in the embodiments of the present application, through the matching relationship between the locking pin and the locking buckle, the locking buckle is locked and unlocked by the limit block and the limit member in the first locking position, and the locking buckle and the locking pin are unlocked through the operating hole in the second locking position, so that the secondary circuit can be used to carry out the normal high-voltage process first, and then the main circuit can be disconnected with a delay, thereby avoiding the loss of performance life of the high-voltage components and reducing safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0016] Figure 1This is a schematic diagram of the maintenance switch structure of an embodiment of the present application;

[0017] Figure 2 yes Figure 1 A schematic diagram of a partial enlargement of the structure of the middle limiter;

[0018] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure along A-A';

[0019] Figure 4 yes Figure 2 Schematic diagram of the cross-sectional structure along B-B';

[0020] Figure 5 yes Figure 1 Schematic diagram of the cross-sectional structure along C-C';

[0021] Figure 6 yes Figure 1 Schematic diagram of the cross-sectional structure along D-D'.

[0022] in:

[0023] 100-Maintenance switch;

[0024] 1-socket; 11-first housing; 12-first built-in space; 13-main circuit contact terminal; 14-secondary circuit contact terminal; 15-locking pin;

[0025] 2-plug; 21-second housing; 22-second built-in space; 23-main circuit pin; 24-secondary circuit pin; 25-locking buckle; 251-limiting block; 26-limiting member; 27-pad; 271-withdrawal guide mechanism; 28-operating hole;

[0026] 3- Positioning and guiding mechanism;

[0027] 41-first effective contact portion; 42-second effective contact portion;

[0028] 51 - first locking position; 52 - second locking position.

[0029] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0030] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0031] The directional words appearing in the following description are all directions shown in the figures, and do not limit the maintenance switch, battery pack and specific vehicle structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0032] See also Figure 1 , Figure 5 and Figure 6 The embodiment of the present application provides a maintenance switch 100, including a socket 1 and a plug 2, the socket 1 includes a first shell 11, the first shell 11 encloses a first built-in space 12, the main circuit contact terminal 13 and the secondary circuit contact terminal 14 are arranged in the first built-in space 12, and the locking pin 15 is arranged on the first shell 11; the plug 2 includes a second shell 21, the second shell 21 encloses a second built-in space 22, the main circuit pin 23 and the secondary circuit pin 24 are arranged in the built-in space, and the locking pin 15 is arranged on the second shell 21.

[0033] The maintenance switch 100 still plays an irreplaceable role in the maintenance of new energy vehicles. The maintenance switch 100 is a mechanical component used to control the vehicle electrical system, which can provide power-off protection, system isolation, troubleshooting, electrical connection disconnection, system reset and other functions during the maintenance and repair process.

[0034] Although the vehicle control system can detect signals between circuits and choose to increase or decrease the voltage according to the detection signal to make more complex circuit changes, the safest way is to use mechanical switch components to completely disconnect the power circuit before repair and maintenance. Using detection signals is prone to missed detection and false detection, which poses certain safety risks to operators in the repair and maintenance process.

[0035] The maintenance switch 100 adopts a mechanical structure and does not rely on the working state of electronic components or circuits. It has more advantages in reliability and is not prone to electronic failures, signal interference, or missed detection or false detection.

[0036] The maintenance switch 100 adopts a mechanical structure, which can provide a visible and perceptible physical disconnection when disconnecting the electrical connection, helping operators to always confirm that the electrical system is always in a power-off state during maintenance or repair, reducing the risk of failure and other electrical safety accidents.

[0037] The mechanical structure of the maintenance switch 100 is generally also simple in structure and operation, and does not require complex circuit design or electronic components, making it easier to understand and operate, and having the advantage of being simpler and more intuitive in terms of maintenance and repair.

[0038] The maintenance switch 100 includes two main components: a plug 2 and a socket 1. The socket 1 is formed by a first shell 11, and the main components are arranged in a first built-in space 12 formed by the first shell 11. The plug 2 is formed by a second shell 21, and the main components are arranged in a second built-in space 22 formed by the second shell 21. In order for the main components in the socket 1 to contact the main components in the plug 2, it is first necessary that the first shell 11 and the second shell 21 can cooperate with each other and have a common embedded portion.

[0039] In the embodiment of the present application, the first shell 11 is embedded in the second shell 21, and the side of the first shell 11 away from the first built-in space 12 is tightly attached to the side of the second shell 21 close to the second built-in space 22. The first shell 11 is embedded in the second shell 21 and can slide relative to each other along the direction of engagement of the plug 2 and the socket 1 on the contact surface where the first shell 11 and the second shell 21 are tightly attached, so as to facilitate the completion of the embedding and separation actions.

[0040] The first shell 11 and the second shell 21 have matching geometric shapes to ensure that they can be properly aligned, embedded and separated. At the same time, the shell sizes of the first shell 11 and the second shell 21 match each other, maintaining matching in terms of length, width and height, so that the main components of the plug 2 and the socket 1 can be connected and matched, and maintain a certain reasonable embedding depth.

[0041] In some embodiments, the second shell 21 can also be embedded in the first shell 11, and the side of the first shell 11 close to the first built-in space 12 is in close contact with the side of the second shell 21 away from the second built-in space 22. The matching relationship between the first shell 11 and the second shell 21 can be flexibly adjusted, and the size can be adjusted according to actual usage to adapt to the connection relationship between the plug 2 and the socket 1 with different requirements.

[0042] In some embodiments, in order to ensure the correct alignment of the plug 2 and the socket 1, a positioning guide mechanism 3 is also provided. The positioning guide mechanism 3 can be a structure formed by protrusions and grooves, wedge-shaped fit or other formations. Specifically, two protrusion structures are formed on the side of the first shell 11 away from the first built-in space 12, and a groove matching the size and shape of the protrusion structure is formed on the side of the second shell 21 close to the second built-in space 22, so that the first shell 11 and the second shell 21 are conveniently aligned and embedded, and a certain constraint relationship is added along the mating direction of the plug 2 and the socket 1 to improve the reliability of the mating and the convenience of operation.

[0043] See also Figure 3 , a locking pin 15 is provided on the first shell 11, and a locking buckle 25 is provided on the second shell 21. In the embodiment of the present application, when the first shell 11 is embedded in the second shell 21, the locking pin 15 is provided on the side of the first shell 11 away from the first built-in space 12, and the locking buckle 25 is provided on the side of the second shell 21 close to the second built-in space 22. The locking pin 15 and the locking buckle 25 cooperate with each other at the contact surface between the first shell 11 and the second shell 21. The locking pin 15 is fixedly provided on the first shell 11, and the locking buckle 25 can slide along the second shell 21 along the mating direction of the plug 2 and the socket 1 when no additional fixing structure is provided. The locking pin 15 is embedded in the locking buckle 25, and the relative sliding of the first shell 11 and the second shell 21 is further restricted.

[0044] In some embodiments, when the second shell 21 is embedded in the first shell 11, the locking pin 15 is arranged on the side of the first shell 11 close to the first built-in space 12, and the locking buckle 25 is arranged on the side of the second shell 21 away from the second built-in space 22. The matching relationship between the locking pin 15 and the locking buckle 25 can be flexibly adjusted, so that the size can be adjusted according to actual usage to adapt to the connection relationship between the plug 2 and the socket 1 with different requirements.

[0045] In some embodiments, the locking buckle 25 cooperates with the positioning guide mechanism 3 to form a groove formed by a depression on one side of the second shell 21 close to the second built-in space 22, further restricting the sliding direction of the locking buckle 25 and improving the reliability of the locking buckle 25 structure and the ease of operation.

[0046] The setting of the locking pin 15 and the locking buckle 25 enables the first shell 11 and the second shell 21 to further produce a reliable connection after matching with each other. The locking mechanism formed by the locking pin 15 embedded in the locking buckle 25 can ensure a firm connection between the plug 2 and the socket 1.

[0047] Furthermore, the locking pin 15 and the locking buckle 25 can prevent the plug 2 from loosening and falling off due to vibration, friction or other external forces, resulting in accidental separation, and provide additional holding force to ensure the stability of signal transmission or power transmission. At the same time, the locking pin 15 and the locking buckle 25 can prevent the plug 2 from being incompletely inserted into the socket 1 or the plug 2 is inserted in the wrong direction, avoid poor electrical contact, short circuit or other electrical safety problems, and reduce possible electrical safety risks.

[0048] Furthermore, by providing an additional fixing mechanism at the end of the locking buckle away from the locking pin 15, the locking buckle 25 can be fixed at the desired locking position, and manual unlocking or operation is required to continue sliding until the plug 2 is separated from the socket 1. By adding a link that requires manual unlocking or operation during the sliding of the locking buckle 25, the operator can be further confirmed through the mechanical structure, thereby improving reliability and safety. The specific mechanical structure for fixing the locking buckle 25 at the desired locking position will be further explained in the following description.

[0049] The main components arranged in the first built-in space 12 and the second built-in space 22 are a main circuit contact terminal 13 and a main circuit pin 23 for controlling the main circuit, and a secondary circuit contact terminal 14 and a secondary circuit pin 24 for controlling the secondary circuit.

[0050] In the embodiment of the present application, the secondary circuit is the Main Distributor Control Unit (MDCU) interlock detection circuit, which is part of the vehicle electrical system and is used to ensure the coordination and safety between the various systems of the vehicle, monitor and control the interlock conditions between different systems to ensure correct coordination and operation between the systems.

[0051] The MDCU interlock detection circuit is usually composed of sensors, control modules and switch devices. Sensors are used to detect the status and signals of various vehicle systems, including but not limited to brake pedal sensors, steering angle sensors, vehicle speed sensors, accelerator pedal sensors, etc.

[0052] The control module is the core of the vehicle control system. It controls the entire system by receiving signals from sensors and performing logical judgment and control according to interlocking conditions.

[0053] The switch device is composed of a secondary circuit contact terminal 14 and a secondary circuit pin 24, and is used to achieve connection and disconnection between different systems.

[0054] The main circuit is the main relay drive circuit, and the main relay is used to control and protect the power supply and power-off operation of the vehicle power battery pack. The main relay drive power circuit in the battery mainly includes the power battery, the main relay, the control module and the switch device.

[0055] The power battery is an energy storage device for electric vehicles, usually composed of multiple battery modules, which can supply the electric motor to drive the vehicle.

[0056] The main relay is a switch between the battery pack and other electrical systems of the vehicle. The control module can monitor and control the status of the power battery. The control module can be a battery management system (BMS) or other specialized control units.

[0057] The switch device is arranged in the main relay driving circuit, including the main circuit contact terminal 13 and the main circuit pin 23, and controls the on and off of the main relay by controlling the on and off of the main relay driving circuit, thereby controlling the on and off of the vehicle battery power supply.

[0058] Furthermore, the length of the first effective contact portion 41 formed by the embedded connection between the main circuit pin 23 and the main circuit contact terminal 13 is set to be greater than the length of the second effective contact portion 42 formed by the embedded connection between the secondary circuit pin 24 and the secondary circuit contact terminal 14.

[0059] In some embodiments, the length of the primary circuit pin 23 may be greater than the length of the secondary circuit pin 24 .

[0060] In some embodiments, it can also be configured that the length of the primary circuit contact terminal 13 is greater than the length of the secondary circuit contact terminal 14 .

[0061] Through such a setting, it is not only possible to provide sufficient contact area and contact pressure for the main circuit with high current load, reduce the generation of resistance and contact resistance, and avoid resistance increase and overheating problems caused by poor contact. The long length of the first effective contact portion 41 can also provide better mechanical support and fixation, reduce the looseness and vibration between the main circuit pin 23 and the main circuit contact terminal 13, help prevent accidental disconnection or poor contact of the contact portion, and maintain the stability of the electrical connection.

[0062] Furthermore, because the main circuit pin 23 and the secondary circuit pin 24 located in the second built-in space 22 are separated from the main circuit contact terminal 13 and the secondary circuit contact terminal 14 at the same rate, the secondary circuit pin 24 will complete the separation first during the separation process, the secondary circuit will be disconnected first, and then the main circuit pin 23 will be separated, and then the main circuit will be disconnected.

[0063] After the secondary circuit is disconnected, the main circuit will be disconnected after a certain delay. Through this setting, after the interlock circuit signal on the secondary circuit is disconnected, the control module has time to process and control the high-voltage components in the vehicle to complete the pressing process after receiving the interlock circuit fault, avoiding the loss of performance and life of the high-voltage components caused by directly cutting off the power supply, and then completing the disconnection of the main circuit to completely cut off the vehicle power supply.

[0064] Furthermore, the locking buckle 25 extends toward the second housing 21 at one end away from the locking pin 15 on the side close to the second housing 21 to form a limit block 251. When the secondary circuit pin 24 is separated from the secondary circuit contact terminal 14, that is, the secondary circuit is disconnected, and the main circuit pin 23 is still engaged with the main circuit contact terminal 13, that is, the main circuit is still connected, the limit block 251 can cooperate with the structure of the second housing 21 to lock the locking buckle 25 in the second locking position 52. The locking buckle 25 is locked in the second locking position 52 by the limit block 251, and the operator needs to manually unlock it, which further increases the processing time for the control module to process and control the high-voltage parts in the vehicle to complete the pressing process after the secondary circuit is disconnected, further improving safety and reliability.

[0065] In the embodiment of the present application, the first shell 11 is embedded in the second shell 21, and an operating hole 28 is opened at an effective position on the second shell 21. The operating hole 28 is arranged near the end of the locking buckle 25 away from the locking pin 15, so that the locking buckle 25 is exposed through the operating hole 28. When the locking buckle 25 is pressed, the end of the locking buckle 25 away from the locking pin 15 is pressed down, and the part engaged with the locking pin 15 is lifted up, completing the unlocking action.

[0066] In some embodiments, the second shell 21 is embedded in the first shell 11, and an operating hole 28 is opened at an effective position on the first shell 11. The operating hole 28 is set close to the interlocking part of the locking buckle 25 and the locking pin 15, so that the locking buckle 25 is exposed through the operating hole 28. When the locking buckle 25 is pressed, the locking buckle 25 is pressed down away from one end of the locking pin 15, driving the interlocking part of the locking buckle 25 and the locking pin 15 to be pressed down as well, completing the unlocking action.

[0067] See also Figure 2 , Figure 3 and Figure 4 When the secondary circuit pin 24 and the secondary circuit terminal, the main circuit pin 23 and the main circuit contact terminal 13 are both engaged, that is, when the main circuit and the secondary circuit are both in an effectively connected working state, the limiter 26 and the cushion block 27 structure are added to lock the end of the locking buckle 25 away from the locking pin 15 in the first locking position 51. To prevent the locking buckle 25 from loosening in the working state, the operator is also required to confirm and manually unlock the plug 2 and the socket 1 when starting to unlock, which further improves safety and reliability.

[0068] The limiting member 26 can be embedded in the limiting block 251, but the limiting member 26 can move elastically up and down. Under a certain external force, the limiting member 26 and the limiting block 251 can be separated, and the locking buckle 25 is separated from the first locking position 51. The cushion block 27 is arranged between the limiting member 26 and the second housing 21. Through the arrangement of the cushion block 27, the movement range of the limiting member 26 can be limited, so that the limiting block 251 and the limiting member 26 cannot be unlocked, and the locking buckle 25 will be locked in the first locking position 51.

[0069] A withdrawal guiding mechanism 271 may also be provided below the cushion block 27 to guide and limit the withdrawal direction of the cushion block 27, making it more convenient to withdraw.

[0070] In some embodiments, the first shell 11 is embedded in the second shell 21 , and the locking buckle 25 and the limiting member 26 are both disposed on a side of the second shell 21 close to the second built-in space 22 .

[0071] In some embodiments, the second shell 21 is embedded in the first shell 11 , and the locking buckle 25 and the limiting member 26 are both arranged on a side of the second shell 21 away from the second built-in space 22 .

[0072] By flexibly adjusting the position to adapt to different embedding relationships, it is convenient to adapt to different usage scenarios.

[0073] In some embodiments, the direction in which the cushion block 27 is withdrawn from between the stopper 26 and the second housing 21 is different from the direction in which the plug 2 is engaged with the socket 1. The operator cannot subconsciously withdraw the cushion block 27 and unlock the locking buckle 25 from the first locking position 51 based on operating habits, which further improves safety.

[0074] The operation process of the maintenance switch 100 from engagement to unlocking will be described in detail below.

[0075] In the working state, when the secondary circuit pin 24 and the secondary circuit terminal, and the main circuit pin 23 and the main circuit contact terminal 13 in the maintenance switch 100 are kept engaged, that is, when the main circuit and the secondary circuit are kept in an effectively connected working state, the end of the locking buckle 25 away from the locking pin 15 is in the first locking position 51, and the locking buckle 25 is engaged with the locking pin 15.

[0076] The operator pulls out the cushion block 27 and presses down the limiting member 26 , so that the locking buckle 25 is unlocked from the first locking position 51 .

[0077] The plug 2 and the socket 1 are gradually separated, and the locking buckle 25 remains engaged with the locking pin 15. When the secondary circuit pin 24 is separated from the secondary circuit contact terminal 14, that is, the secondary circuit is disconnected, and the main circuit pin 23 remains engaged with the main circuit contact terminal 13, that is, the main circuit remains connected, the locking buckle 25 cooperates with the second shell 21 to lock in the second locking position 52.

[0078] When a fault is detected in the secondary circuit, the high-voltage components begin to reduce the high voltage, and the process time does not exceed 1000ms.

[0079] The operator presses the locking buckle 25 through the operating hole 28 to unlock the locking buckle 25 and the locking pin 15. The operation time should be greater than 2000ms.

[0080] The plug 2 continues to separate from the socket 1. When the secondary circuit pin 24 separates from the secondary circuit contact terminal 14, and the main circuit pin 23 separates from the main circuit contact terminal 13, that is, the secondary circuit and the main circuit are both disconnected, the main circuit power supply is cut off, and the power is completely cut off.

[0081] The embodiment of the present application further provides a battery pack, which adopts the maintenance switch 100 described in the above embodiment.

[0082] An embodiment of the present application also provides a vehicle, comprising the battery pack described in the above embodiment.

[0083] It can be understood that the maintenance switch 100 provided in the embodiment of the present application, through the matching relationship between the locking pin 15 and the locking buckle 25, the locking buckle 25 is locked and unlocked by the limit block 251 and the limit member 26 in the first locking position 51, and the locking buckle 25 is unlocked by the operating hole 28 in the second locking position 52 to unlock the locking buckle 25 and the locking pin 15, and can first use the secondary circuit to carry out the normal high-voltage process, and then delay the disconnection of the main circuit, thereby avoiding the loss of performance life of the high-voltage components and reducing safety risks.

[0084] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A maintenance switch, characterized in that: include: A socket, comprising a first shell, a main circuit contact terminal, a secondary circuit contact terminal and a locking pin, wherein the first shell encloses a first built-in space, the main circuit contact terminal and the secondary circuit contact terminal are arranged in the first built-in space, and the locking pin is arranged on the first shell; A plug, comprising a second shell, a main circuit pin, a secondary circuit pin and a locking buckle, wherein the second shell encloses a second built-in space, the main circuit pin and the secondary circuit pin are arranged in the second built-in space, and the locking buckle is arranged on the second shell; The plug and the socket are engaged with each other, the main circuit pin is embedded in the main circuit contact terminal, the secondary circuit pin is embedded in the secondary circuit contact terminal, the locking pin is embedded in the locking buckle, and the locking buckle slides along the engagement direction of the plug and the socket; When the secondary circuit pin is separated from the secondary circuit contact terminal and the main circuit pin is still engaged with the main circuit contact terminal, the locking buckle is locked at the second locking position of the second housing away from one end of the locking pin.

2. The maintenance switch according to claim 1, characterized in that: The first shell is embedded in the second shell, the locking pin is arranged on a side of the first shell away from the first built-in space, and the locking buckle is arranged on a side of the second shell close to the second built-in space; Or the second shell is embedded in the first shell, the locking pin is arranged on the side of the first shell close to the first built-in space, and the locking buckle is arranged on the side of the second shell away from the second built-in space.

3. The maintenance switch according to claim 1, characterized in that: The length of the first effective contact portion between the main circuit pin and the main circuit contact terminal is greater than the length of the second effective contact portion between the secondary circuit pin and the secondary circuit contact terminal.

4. The maintenance switch according to claim 3, characterized in that: The main circuit pin length is greater than the secondary circuit pin length; Alternatively, the length of the primary circuit contact terminal is greater than the length of the secondary circuit contact terminal.

5. The maintenance switch according to claim 1, characterized in that: When the secondary circuit pin and the secondary circuit contact terminal, and the main circuit pin and the main circuit contact terminal are both kept engaged, the locking buckle is locked at the first locking position of the second housing away from one end of the locking pin.

6. The maintenance switch according to claim 5, characterized in that: The locking buckle extends toward the second shell at one end away from the locking pin and close to the second shell to form a limit block, and the second shell also includes a limit piece arranged at the first locking position and a cushion block arranged between the limit piece and the second shell, and the limit block is embedded in the limit piece; by pulling out the cushion block from between the limit piece and the second shell, the limit block is disengaged from the limit piece, and the locking buckle is unlocked from the first locking position.

7. The maintenance switch according to claim 6, characterized in that: The direction in which the cushion block is withdrawn from between the limiting member and the second shell is different from the mating direction of the plug and the socket.

8. The maintenance switch according to claim 1, characterized in that: The second shell or the first shell is provided with an operation hole, and the locking buckle is exposed through the operation hole; The locking buckle is pressed through the operating hole, the locking buckle is disengaged from the locking pin, the secondary circuit pin is separated from the secondary circuit contact terminal, and the main circuit pin is separated from the main circuit contact terminal.

9. A battery pack, characterized in that: A maintenance switch as described in any one of claims 1 to 8 is used.

10. A vehicle, characterized in that: A battery pack comprising the battery pack of claim 9.

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