Quick-plug type high-voltage box

Abstract

The utility model discloses a quick-plug high-voltage box, which comprises a box body cover, a first group of connectors are arranged on the rear end wall of the box body cover, and the front end of the box body cover is an open end; the rear end wall of the box body is provided with a second group of connectors, the box body is arranged in the box body cover through the open end, the second group of connectors are correspondingly inserted and matched with the first group of connectors, and the box body is detachably connected with the box body cover through a connecting assembly. The quick-plug type high-voltage box is convenient and quick to install, and can ensure that the connectors on the quick-plug type high-voltage box are not wrongly connected.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage box technology, and more specifically, to a quick-connect high-voltage box. Background Technology

[0002] In an energy storage system, a high-voltage box is installed on the battery rack and is responsible for connecting the energy storage battery pack to the external power system to realize the input and output of electrical energy.

[0003] Currently, conventional high-voltage boxes on the market require numerous connectors to be connected after being placed on the battery rack. This process is cumbersome and complex, and it is easy to make mistakes, which can lead to module damage or poor contact, affecting the product's lifespan.

[0004] Therefore, how to make the high-voltage box easy and quick to install while ensuring that the connectors on it are not connected incorrectly is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a quick-connect high-voltage box, which is easy and quick to install and can ensure that the connectors on it are not connected incorrectly.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A quick-connect high-voltage box, comprising:

[0008] The enclosure has a first set of connectors on its rear end wall, and the front end of the enclosure is an open end;

[0009] The enclosure has a second set of connectors on its rear wall. The enclosure is installed into the enclosure cover through the opening end, and the second set of connectors is inserted into the first set of connectors. The enclosure is detachably connected to the enclosure cover through a connecting component.

[0010] Preferably, the connecting assembly includes a hook, a connecting plate, and a plurality of lock-on screws. The hook and the connecting plate are respectively located on the same side wall of the housing and the housing cover. Each lock-on screw is located on the hook and can be detachably inserted into the socket of the connecting plate.

[0011] Preferably, the hook is located near the front end of the housing, and the connecting plate is located near the opening end of the housing cover.

[0012] Preferably, the connecting plate is provided with mounting holes for fixing to the battery holder, and the mounting holes do not coincide with the hanging ears.

[0013] Preferably, there are two connecting components, and the two connecting components are arranged symmetrically.

[0014] Preferably, the inner walls of the housing are provided with a number of protrusions.

[0015] Preferably, the outer wall of the front end of the box is provided with a positioning pin, and the inner wall of the front end of the box cover is provided with a positioning element, wherein the positioning pin is inserted into the positioning hole of the positioning element.

[0016] Preferably, the front wall of the housing is provided with a lamp hole, and the lamp hole is provided with a position indicator light, which is electrically connected to the second set of connectors.

[0017] Preferably, the second set of connectors includes a male signal connector and two pairs of second male power connectors and second female power connectors. One of the male signal connectors is used to connect all the signal lines inside the enclosure. The first pair of second male power connectors and second female power connectors are arranged vertically at intervals and connected to the circuit breaker inside the enclosure via a copper busbar. The second pair of second male power connectors and second female power connectors are arranged vertically at intervals and connected to the fuse inside the enclosure via a copper busbar.

[0018] The first set of connectors includes a female signal connector and two pairs of first female power connectors and first male power connectors. The female signal connector is used to connect to the control system and is plugged into the male signal connector. The first pair of first female power connectors and first male power connectors are used to connect to the power conversion system and are plugged into the first pair of second male power connectors and second female power connectors respectively. The second pair of first female power connectors and first male power connectors are used to connect to the battery module and are plugged into the second pair of second male power connectors and second female power connectors respectively.

[0019] Preferably, the positive and negative terminals of the position indicator light are connected to any two pins of the male signal connector via wires.

[0020] The quick-connect high-voltage box provided by this utility model has its second set of connectors on the box body pre-connected to the signal lines and copper busbars inside the box body before leaving the factory. During installation, the box cover is first placed on the top or bottom of the battery rack with the opening end of the box cover facing outward. Then, the first set of connectors on the box cover is pre-connected to other electrical equipment (such as control systems and power supply systems). Then, the front end of the box body is aligned with the opening end of the box cover, and the box body is pushed into the box cover. The second set of connectors is directly inserted into the corresponding first set of connectors. Finally, the box body and the box cover are connected together using the connecting assembly, which makes the installation of the high-voltage box convenient and quick, and ensures that the connectors on the high-voltage box are not connected incorrectly. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 A schematic diagram of the internal structure of the box provided by this utility model;

[0023] Figure 2 This is a top view of the internal structure of the box provided by this utility model;

[0024] Figure 3 A schematic diagram of the structure of the box cover provided by this utility model;

[0025] Figure 4 This is a rear view of the housing cover provided by this utility model;

[0026] Figure 5 A schematic diagram of the installation of a quick-connect high-voltage box on a battery rack according to this utility model;

[0027] Figure 6 This is a schematic diagram of the insertion of the female power connector and the male power connector provided by this utility model;

[0028] Figure 7 This is a schematic diagram of the insertion of the female signal connector and the male signal connector provided by this utility model;

[0029] Figure 8 This is a schematic diagram of the structure of the female signal connector provided by this utility model.

[0030] Figure label:

[0031] 1-Enclosure cover; 11-Female signal connector; 12-First female power connector; 13-First male power connector; 14-Positioning component; 15-Protrusion bulge;

[0032] 2-Enclosure; 20-Pin; 21-Male signal connector; 22-Second male power connector; 23-Second female power connector; 24-Positioning pin; 25-Closed position indicator; 26-Electrical mounting plate; 27-Copper busbar; 28-Module controller; 29-Circuit breaker switch; 210-High voltage box operation indicator; 211-High voltage box control circuit switch; 212-Shunt unit; 213-Switching power supply; 214-Pre-charge contactor; 215-Fuse; 216-Pre-charge resistor; 217-Main circuit contactor; 218-Intermediate relay;

[0033] 3-Connecting component; 31-Hook; 311-Handle structure; 32-Connecting plate; 321-Mounting hole; 33-Slip-on screw; 34-Nut;

[0034] 4-Battery holder. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] The core of this utility model is to provide a quick-connect high-voltage box, which is easy and quick to install and can ensure that the connectors on it are not connected incorrectly.

[0037] It should be noted that in this embodiment, the orientation or positional relationship indicated by "up", "down", "front", "back", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on this application.

[0038] Please refer to Figure 1 , Figure 3 and Figure 5 This application provides a quick-connect high-voltage box, including a box body 2 and a box cover 1. The rear end wall of the box cover 1 is provided with a first set of connectors, and the front end of the box cover 1 is an open end. The rear end wall of the box body 2 is provided with a second set of connectors. The box body 2 is inserted into the box cover 1 through the open end, and the second set of connectors is correspondingly plugged into the first set of connectors. The box body 2 is detachably connected to the box cover 1 through a connecting component 3.

[0039] It should be noted that the high-voltage box is a core component of the energy storage system, enabling functions such as charging and discharging control, protection, and monitoring. For example... Figure 2As shown, the high-voltage box typically houses electrical mounting plates 26, module controllers 28, circuit breaker switches 29, high-voltage box operation indicator lights 210, high-voltage box control circuit switches 211, shunts 212, switching power supplies 213, pre-charge contactors 214, fuses 215, pre-charge resistors 216, main circuit contactors 217, intermediate relays 218, and other electrical components. The power supply system in the energy storage system transmits power to all electrical components within the high-voltage box, and the control system transmits signals to some of the electrical components within the high-voltage box. Therefore, the second set of connectors on the enclosure 2 typically includes a second power connector for transmitting power and a second signal connector for transmitting signals. The second power connector connects to the copper busbar 27 inside the enclosure 2, which is connected to electrical components (such as fuses 215 and circuit breakers). The second signal connector connects to all signal lines inside the enclosure 2.

[0040] Furthermore, the shape of the enclosure 1 is adapted to the shape of the enclosure 2, and the front end of the enclosure 1 is an open end to ensure that the enclosure 2 can be installed inside the enclosure 1. During the installation of the enclosure 2 into the enclosure 1, the opposite side walls of the enclosure 2 slide and contact the opposite side walls of the enclosure 1. The rear end wall of the enclosure 1 is provided with a first set of connectors that corresponds to and engages with the second set of connectors. That is, the first set of connectors also includes a first power connector for transmitting power and a first signal connector for transmitting signals. The first power connector is connected to the power supply system, and the first signal connector is connected to the control system. Thus, by inserting the first power connector in the first set of connectors and the second power connector in the second set of connectors, the power supply system in the energy storage system can transmit power to all electrical components in the high-voltage box. By inserting the first signal connector in the first set of connectors and the second signal connector in the second set of connectors, the control system can transmit signals to some electrical components in the high-voltage box.

[0041] Furthermore, since the first set of connectors and the second set of connectors are connected by a plug-in connection, the first power connector in the first set of connectors and the second power connector in the second set of connectors are connected by quick-plug male and female connectors, and the first signal connector in the first set of connectors and the second signal connector in the second set of connectors are connected by quick-plug male and female connectors.

[0042] Before leaving the factory, the second set of connectors on the box 2 of the quick-connect high-voltage box in the above embodiment is pre-connected to the signal lines and copper busbars 27 inside the box 2. During installation, the box cover 1 is first placed on the top or bottom of the battery rack 4 with the opening end of the box cover 1 facing outward. Then, the first set of connectors on the box cover 1 is pre-connected to other electrical equipment (such as control systems and power supply systems). Then, the rear end of the box 2 is aligned with the opening end of the box cover 1, and the box 2 is pushed into the box cover 1. The second set of connectors is directly inserted into the corresponding first set of connectors. Finally, the box 2 and the box cover 1 are connected together using the connecting component 3, which makes it convenient and quick to install the high-voltage box and ensures that the connectors on the high-voltage box are not connected incorrectly.

[0043] Considering the specific configuration of the connecting component 3, please refer to the following based on the above embodiment: Figure 1 , Figure 3 and Figure 4 The connecting component 3 includes a hanging ear 31, a connecting plate 32, and several non-detachable screws 33. The hanging ear 31 and the connecting plate 32 are respectively located on the same side wall of the housing 2 and the housing cover 1. Each non-detachable screw 33 is located on the hanging ear 31 and can be detachably inserted into the socket of the connecting plate 32.

[0044] Specifically, a hanging lug 31 is provided on the left (or right) wall of the housing 2, and several non-detachable screws 33 are provided on the hanging lug 31. Preferably, two non-detachable screws 33 are provided, one at the top and one at the bottom of the hanging lug 31, to save space and cost while ensuring the stability of the connection between the hanging lug 31 and the connecting plate 32. Of course, the number of non-detachable screws 33 can also be more than three depending on specific needs, and the number and arrangement are not unique. A connecting plate 32 is provided on the left (or right) wall of the housing cover 1, with the hanging lug 31 and the connecting plate 32 on the same side. The connecting plate 32 has several insertion holes corresponding one-to-one with the non-detachable screws 33. In this way, by passing each non-detachable screw 33 through its corresponding insertion hole and fastening it to the connecting plate 32 with a nut 34, the hanging lug 31 and the connecting plate 32 can be connected together, that is, the housing 2 and the housing cover 1 can be connected together.

[0045] The connecting component 3 with the above-mentioned structure has the characteristic that the screws 33 will not fall off after being loosened, and the hanging ears 31 and connecting plate 32 can be quickly disassembled and assembled, making the disassembly and assembly of the box 2 and the box cover 1 more convenient.

[0046] In one specific embodiment, please refer to Figure 1 and Figure 3The hanging ear 31 is L-shaped. The first plate of the hanging ear 31 is installed on the side wall of the housing 2, and the second plate of the hanging ear 31 is connected to the connecting plate 32 by a captive screw 33. The connecting plate 32 is integrally formed with the housing cover 1. In this way, the L-shaped hanging ear 31 has high strength and good stability, and the connecting plate 32, which is integrally formed with the housing cover 1, also has high strength and good stability, which helps to improve the stability of the connection between the hanging ear 31 and the connecting plate 32.

[0047] To facilitate the insertion of the box 2 into the box cover 1, please refer to the following based on the above embodiment: Figure 1 The lug 31 is equipped with a handle structure 311. Specifically, the second plate of the lug 31 is equipped with a handle structure 311, which makes it convenient for operators to lift or move the box 2, and thus facilitates the installation of the box 2 into the box cover 1, thereby improving the convenience of high-voltage box installation.

[0048] Preferably, the handle structure 311 and several non-detachable screws 33 are located on the same vertical line, which is compact and helps to reduce the horizontal dimension of the second plate of the lug 31, saving space.

[0049] Furthermore, based on the above embodiments, please refer to... Figure 3 The box cover 1 has several protrusions 15 on all its inner walls except for the inner wall at the rear end. In this way, when the box 2 is installed into the box cover 1, the protrusions 15 can reduce the friction between the box 2 and the box cover 1, making it easier for the box 2 to be installed into the box cover 1.

[0050] Preferably, the upper side of the box cover 1 is set as the open side, which can not only avoid the upper side wall of the box 2 from rubbing against the upper side wall of the box cover 1 and thus preventing the box 2 from being installed, but also make it convenient for the operator to observe whether the box 2 and the box cover 1 are properly installed.

[0051] To facilitate the connection between the hook 31 and the connecting plate 32, please refer to the following based on the above embodiment: Figure 5 The ear loop 31 is located near the front end of the housing 2, and the connecting plate 32 is located near the opening end of the housing cover 1.

[0052] Understandably, after the enclosure cover 1 is installed on the battery rack 4, the open end of the enclosure cover 1 faces outwards, and after the enclosure 2 is installed inside the enclosure cover 1, the front end of the enclosure 2 faces outwards. Therefore, positioning the mounting lug 31 near the front end of the enclosure 2 and the connecting plate 32 near the open end of the enclosure cover 1 facilitates the connection between the mounting lug 31 and the connecting plate 32, thereby improving the ease of connection between the enclosure 2 and the enclosure cover 1, and further enhancing the ease of installation of the high-voltage box. Of course, the mounting lug 31 can be located directly at the front end of the enclosure 2, and the connecting plate 32 can also be located directly at the open end of the enclosure cover 1, making the connection operation of the mounting lug 31 and the connecting plate 32 even more convenient.

[0053] To improve the stability of the high-voltage box on the battery rack 4, please refer to the following embodiments based on the above. Figure 3 and Figure 4 The connecting plate 32 is also provided with mounting holes 321. After the enclosure cover 1 is placed on the battery rack 4, bolts can be passed through the mounting holes 321 to connect the battery rack 4, thereby improving the stability of the enclosure cover 1 and consequently the stability of the high-voltage box on the battery rack 4. Furthermore, it should be noted that the mounting holes 321 and the lugs 31 do not coincide, to avoid the bolts on the mounting holes 321 affecting the tightness of the connection between the lugs 31 and the connecting plate 32.

[0054] To further optimize the stability of the high-voltage box on the battery rack 4, please refer to the above embodiments. Figure 5 There are two connecting components 3, and the two connecting components 3 are arranged symmetrically. That is to say, the two side walls of the box body 2 and the two side walls of the box cover 1 are connected together by two symmetrical connecting components 3, and the two side walls of the box cover 1 are connected to the battery rack 4 as a whole. This can effectively ensure that the high voltage box is firmly installed on the battery rack 4, and greatly improve the stability of the high voltage box on the battery rack 4.

[0055] To ensure that the housing 2 and housing cover 1 are properly assembled, please refer to the following based on the above embodiment: Figure 1 and Figure 4 The outer rear wall of the housing 2 is provided with a positioning pin 24, and the inner rear wall of the housing cover 1 is provided with a positioning component 14. The positioning pin 24 is inserted into the positioning hole of the positioning component 14.

[0056] Specifically, the positioning pin 24 is disposed on the outer rear wall of the housing 2 and extends along the front-rear direction of the housing 2. The positioning element 14 is disposed on the inner rear wall of the housing cover 1, and the positioning element 14 has a positioning hole that is directly opposite to the positioning pin 24 in the front-rear direction. Thus, when installing the housing 2, the housing 2 is inserted into the housing cover 1 until the positioning pin 24 is inserted into the positioning hole, at which point the housing 2 can no longer move, and the housing 2 and the housing cover 1 are fully assembled. At this time, the first set of connectors and the second set of connectors are also inserted accordingly. Therefore, the insertion and cooperation of the positioning pin 24 and the positioning element 14 not only allows the housing 2 and the housing cover 1 to be accurately assembled, but also helps to enhance the stability between the housing 2 and the housing cover 1 and prevent relative movement between the two.

[0057] Preferably, the positioning pins 24 are set as two and are spaced apart and symmetrically arranged in the left and right directions. Correspondingly, the positioning parts 14 are also set as two and are spaced apart and symmetrically arranged in the left and right directions, which can better ensure that the box body 2 and the box cover 1 are assembled in place.

[0058] Furthermore, based on the above embodiments, please refer to... Figure 1The front wall of the housing 2 is provided with a lamp hole, and the lamp hole is provided with a position indicator light 25, which is electrically connected to the second set of connectors.

[0059] Understandably, when any connector in the second group of connectors is plugged into the corresponding connector in the first group of connectors, that connector is powered on. Thus, the position indicator light 25 is connected to any connector in the second group of connectors via a wire. When the housing 2 and the housing cover 1 are assembled in place, that is, when the second group of connectors and the first group of connectors are plugged in in place, the position indicator light 25 is powered on and illuminates, which can remind the operator that the housing 2 and the housing cover 1 are assembled in place, so as to stop pushing the housing 2.

[0060] Considering the specific configuration of the first and second sets of connectors, please refer to the following embodiments based on the above examples: Figure 1 and Figure 3 The second set of connectors includes a male signal connector 21 and two pairs of second male power connectors 22 and second female power connectors 23. The male signal connector 21 is used to connect all the signal lines inside the enclosure 2. The first pair of second male power connectors 22 and second female power connectors 23 are arranged vertically at intervals and connected to the circuit breaker inside the enclosure 2 through a copper busbar 27. The second pair of second male power connectors 22 and second female power connectors 23 are arranged vertically at intervals and connected to the fuse 215 inside the enclosure 2 through a copper busbar 27.

[0061] It should be noted that each pair of second male power connectors 22 and second female power connectors 23 are arranged vertically at intervals and cooperate with each other to connect the power supply system (power conversion system or power supply module) and the electrical components (circuit breaker or fuse 215) inside the enclosure 2, which can easily distinguish the positive and negative poles.

[0062] The first set of connectors includes a female signal connector 11 and two pairs of first female power connectors 12 and first male power connectors 13, such as Figure 7 As shown, the female signal connector 11 is used to connect to the control system and is plugged into the male signal connector 21, as follows. Figure 6 As shown, the first pair of first female power connectors 12 and first male power connectors 13 are used to connect the power conversion system and are respectively plugged into the first pair of second male power connectors 22 and second female power connectors 23 to realize the electrical connection between the circuit breaker and the power conversion system. The second pair of first female power connectors 12 and first male power connectors 13 are used to connect the battery module and are respectively plugged into the second pair of second male power connectors 22 and second female power connectors 23 to realize the electrical connection between the fuse 215 and the battery module.

[0063] Considering the specific connection method between the position indicator 25 and the second set of connectors, based on the above embodiment, the positive and negative terminals of the position indicator 25 are connected to any two pins 20 in the signal connector 21 via wires.

[0064] Understandably, the male signal connector 21, also known as the male head signal connector, typically refers to a connector with pins 20, while the female signal connector 11, also known as the female head signal connector, typically refers to a connector with a groove. The pins 20 of the male signal connector 21 are inserted into the groove of the female signal connector 11, thus achieving electrical connection between the mating male and female signal connectors 21. Therefore, the positive and negative terminals of the position indicator light 25 are connected via wires to any two pins 20 of the male signal connector 21 on the rear wall of the housing 2, facilitating the electrical connection wiring between the position indicator light 25 and the second set of connectors.

[0065] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0066] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0067] The quick-connect high-voltage box provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A quick connect high pressure tank characterized by, The utility model relates to a box cover (1) is provided with first group connector in rear end wall, and the front end of box cover (1) is open end; The utility model relates to a box (2) is provided with second group connector in rear end wall, and the box (2) is loaded into the box cover (1) through the open end and second group connector is inserted with first group connector, and the box (2) is detachably connected with the box cover (1) through connecting assembly (3). Connecting assembly (3) includes ear (31), connecting plate (32) and a plurality of loose screws (33), ear (31) and connecting plate (32) are arranged on the same side wall of box (2) and box cover (1) respectively, and each loose screw (33) is arranged on ear (31) and can be detachably inserted in the insertion hole of connecting plate (32).

2. The quick plug high pressure tank of claim 1, wherein, The ear (31) is adjacent to the front end of the box (2), and the connecting plate (32) is adjacent to the open end of the box cover (1).

3. The quick plug high pressure tank of claim 2, wherein, The connecting plate (32) is provided with a mounting hole (321) for fixing the battery holder (4), and the mounting hole (321) does not coincide with the ear (31).

4. The quick plug high pressure tank of claim 3, wherein, The connecting assembly (3) is provided with two, and the two connecting assemblies (3) are symmetrically arranged.

5. The quick plug high pressure tank of claim 4, wherein, A plurality of convex hulls (15) are provided on the inner walls of the box cover (1).

6. The quick plug high pressure tank of claim 1, wherein, The rear end of the box (2) is provided with a positioning pin (24), and the rear end of the box cover (1) is provided with a positioning member (14), and the positioning pin (24) is inserted into the positioning hole of the positioning member (14).

7. The quick plug high pressure tank of claim 1, wherein, The front end wall of the box (2) is provided with a lamp hole, and the lamp hole is provided with a home position indicating lamp (25), and the home position indicating lamp (25) is electrically connected with the second group connector.

8. The quick plug high pressure tank according to any one of claims 1 to 7, characterized in that The second group connector includes one male signal connector (21) and two pairs of second male power connectors (22) and second female power connectors (23), one male signal connector (21) is used for connecting all signal lines inside the box (2), the first pair of second male power connectors (22) and second female power connectors (23) are arranged in an upper and lower interval and connected with the circuit breaker in the box (2) through a copper bar (27), and the second pair of second male power connectors (22) and second female power connectors (23) are arranged in an upper and lower interval and connected with the fuse (215) in the box (2) through a copper bar (27); 9. The quick plug high pressure tank of claim 8, wherein, ​ The first group of connectors includes a female signal connector (11) for connecting a control system and plugging into the male signal connector (21), and two pairs of first female power connectors (12) and first male power connectors (13), the first pair of the first female power connectors (12) and the first male power connectors (13) are used for connecting a power conversion system and correspondingly plugging into the second pair of the second male power connectors (22) and the second female power connectors (23) respectively, and the second pair of the first female power connectors (12) and the first male power connectors (13) are used for connecting a battery module and correspondingly plugging into the second pair of the second male power connectors (22) and the second female power connectors (23) respectively.

10. The quick plug high pressure tank of claim 9, wherein, The positive and negative poles of the on-position indicating lamp (25) are connected to any two pins (20) in the male signal connector (21) through wires respectively.

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