High-voltage box

Abstract

A high-voltage box (100), characterized in that it comprises: a box body (10) with an opening at its top, a cover (20) that covers the opening of the box body (10), and an electrical element arranged in a receiving space inside the box body (10), wherein the box body (10) comprises a first side wall (101) and a second side wall (102) which are opposite each other; the receiving space is arranged between the first side wall (101) and the second side wall (102); the electrical element comprises a battery management system (302), at least one of which is a positive fuse (305) on a positive circuit and a negative fuse (307) on a negative circuit; wherein the battery management system (302) is arranged on one side of the receiving space near the first side wall (101), and the at least one of the positive fuse (305) and the negative fuse (307) is arranged on one side of the receiving space near the second side wall (102).

Description

Technical area

[0001] The present application relates to the technical field of electrical energy, in particular to a high-voltage box. State of the art

[0002] The high-voltage box is an important component of the energy storage battery system. It houses a variety of electronic devices, such as battery management systems (BMS), relays, fuses, and power modules. Existing high-voltage boxes often suffer from the chaotic layout of internal electronic devices. In particular, high-power heating devices such as fuses are often located near the BMS, which can easily cause electromagnetic interference to the BMS. These high-power heating devices generate more heat, which can easily lead to excessive temperatures around the BMS, causing BMS components to age, burn out, or fail. Contents of this application

[0003] Based on this, there is a need to provide a high-voltage box to address the above technical problem. By arranging the battery management system with the fuses on both sides of the receiving space within the box body, the fuses are kept away from the battery management system, and electromagnetic interference from the fuses to the battery management system can be reduced, thus beneficially reducing the effect of heat generated by the fuses on the battery management system.

[0004] 1. A high-voltage box comprising: a box body having an opening at its top, a cover covering the opening of the box body, and an electrical element arranged in a receiving space within the box body;

[0005] wherein the box body comprises a first side wall and a second side wall that are opposite each other; the receiving space is arranged between the first side wall and the second side wall; the electrical element comprises a battery management system, at least one of a positive fuse on a positive circuit and a negative fuse on a negative circuit;

[0006] wherein the battery management system is arranged on one side of the receiving space near the first side wall, and the at least one of the positive fuse and the negative fuse is arranged on one side of the receiving space near the second side wall.

[0007] In some embodiments, at least one of the following conditions is met: a distance between the battery management system and the positive fuse is in the range of 200 mm to 280 mm; and a distance between the battery management system and the negative fuse is in the range of 200 mm to 280 mm.

[0008] In some embodiments, the electrical element comprises the positive fuse and the negative fuse; wherein the box body further comprises a third side wall, a fourth side wall, and a bottom plate; wherein the first side wall, the third side wall, the second side wall, and the fourth side wall are sequentially connected at the top and the bottom, and the first side wall, the third side wall, the second side wall, and the fourth side wall are connected to a periphery of the bottom plate to collectively enclose the receiving space;

[0009] wherein the third side wall is provided with a positive input terminal and a negative input terminal on a side near the first side wall, and the third side wall is provided with a positive output terminal and a negative output terminal on a side near the second side wall; the electrical element further comprises an AC / DC power supply module, a balancing relay, a pre-charging resistor, an isolation switch, a positive relay, a negative relay, and a shunt; the positive input terminal, the isolation switch, the positive relay, the positive fuse, and the positive output terminal are sequentially connected to form the positive circuit; the negative input terminal, the isolation switch, the negative relay, the negative fuse, and the positive output terminal are sequentially connected to form the negative circuit;The balancing relay and the pre-charging resistor are connected in series to form a balancing branch; the balancing branch is connected in parallel to the positive relay; the battery management system is connected to the AC / DC power supply module, the positive circuit, and the negative circuit.

[0010] In some embodiments, the box body is a square box; wherein the battery management system is located at a corner between the first side wall and the fourth side wall, and the AC / DC power supply module is located between the fourth side wall and the battery management system; the positive fuse and the positive output terminal are arranged in the same straight line, and the negative fuse and the negative output terminal are arranged in the same straight line.

[0011] In some embodiments, the first side wall, the fourth side wall, and the second side wall are integrally formed bent members to which the third side wall is connected by welding, and a sealing ring is disposed between the cover and the box body.

[0012] In some embodiments, the electrical element further comprises a first temperature sensor and a second temperature sensor connected to the battery management system; wherein the first temperature sensor is disposed adjacent to the positive fuse and the second temperature sensor is disposed adjacent to the negative fuse.

[0013] In some embodiments, a distance between the first temperature sensor and the positive fuse is 18 mm to 22 mm, and a distance between the second temperature sensor and the negative fuse is 18 mm to 22 mm.

[0014] In some embodiments, the connections between the positive relay and the positive fuse, between the positive fuse and the positive output terminal, between the negative relay and the negative fuse, and between the negative fuse and the shunt are each made by a copper row with a first cross-sectional area, wherein the first cross-sectional area is 2.5*40mm 2 -3.5*45mm 2 amounts.

[0015] In some embodiments, one heat sink is disposed on the copper row between the positive relay and the positive fuse, and another heat sink is disposed on the copper row between the negative relay and the negative fuse.

[0016] In some embodiments, the box body is further provided with a fan, and the air outlet surface of the fan faces the heat sink on at least one of the copper rows.

[0017] In some embodiments, a connecting harness between the battery management system and the AC / DC power supply module, the positive circuit, and the negative circuit comprises a high-voltage wire harness and a low-voltage wire harness; wherein the high-voltage wire harness and the low-voltage wire harness are independent of each other; an insulating layer is wrapped around an outer surface of the high-voltage wire harness.

[0018] In some embodiments, the third side wall is further provided with an auxiliary power port, a communication expansion port, a slave power supply communication port, an MBMU (master battery management unit) communication port, an SBMU (slave battery management unit) communication port, a power indicator lamp, a fault indicator lamp, a lifting handle, and a switch handle connected to the isolation switch.

[0019] The present application discloses a high-voltage box comprising: a box body having an opening on its top, a cover covering the opening of the box body, and an electrical element arranged in a receiving space within the box body; wherein the box body comprises a first side wall and a second side wall that are opposite to each other; the receiving space is arranged between the first side wall and the second side wall; the electrical element comprises a battery management system, at least one of a positive fuse on a positive circuit and a negative fuse on a negative circuit; wherein the battery management system is arranged on a side of the receiving space near the first side wall, and the at least one of the positive fuse and the negative fuse is arranged on a side of the receiving space near the second side wall.By arranging the battery management system with the fuses on both sides of the receiving space inside the box body, the fuses are kept away from the battery management system, electromagnetic interference from the fuses to the battery management system can be reduced, so it is advantageous to reduce the effect of heat generated by the fuses on the battery management system. Short description of the drawing Fig. 1 is a schematic structural diagram of a high-voltage box according to the present application. Fig. 2 is a schematic diagram of the internal structure of a high-voltage box according to the present application. Fig. 3 is a schematic diagram of a circuit of a positive circuit and a negative circuit within a high voltage box according to the present application. Fig. 4 is a schematic diagram of part of the structure of a battery management system according to the present application. In the pictures:

[0020] High-voltage box: 100; Box body: 10; First side panel: 101; Second side panel: 102; Third side panel: 103; Lifting handle: 1031; Switch handle: 1032; Fourth side panel: 104; Cover: 20; AC / DC power supply module: 301; Battery management system: 302; Isolation switch: 303; Positive relay: 304; Positive fuse: 305; Negative relay: 306; Negative fuse: 307; Shunt: 308; First temperature sensor: 309; Second temperature sensor: 310; Equalizing relay: 311; Pre-charging resistor: 312; High-voltage wiring harness: 313; Low-voltage wiring harness: 314; 220V power wiring harness: 316; Equalizing connection wiring harness: 315; Hall current sensor: 317; Heatsink: 41, 42; Fan: 50; Sealing ring: 60; Positive input terminal: P+; Negative input terminal: P-; Positive output terminal: B+; Negative output terminal: B-; First zone: A1; Second zone: A2; Auxiliary power terminal: J1; MBMU communication terminal: J2; ​​SBMU communication terminal: J3; Communication expansion terminal: J4; Slave power supply terminal: J5; Power indicator lamp: L1; Fault indicator lamp: L2. Detailed description of the embodiments

[0021] To make the purpose, technical solutions, and advantages of the present application clearer and more understandable, the present application will be described in more detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the present application.

[0022] With reference to the Fig. 1 to 4, where Fig. 3 is a schematic diagram of a circuit of a positive circuit and a negative circuit within a high-voltage box according to the present application, and Fig. 4 is a schematic diagram of part of the structure of a battery management system according to the present application. Fig. 3 shows terminals of each component that connect to relevant pins in the Fig. 4 shown battery management system.

[0023] Embodiments of the present application provide a high-voltage box 100 comprising a box body 10 having an opening at its top, a cover 20 covering the opening of the box body 10, and an electrical element disposed in a receiving space within the box body 10.

[0024] The box body 10 comprises a first side wall 101 and a second side wall 102, which are opposite one another, with the receiving space arranged between the first side wall 101 and the second side wall 102; the electrical element comprises a battery management system 302, a positive fuse 305 on the positive circuit, and / or a negative fuse 307 on the negative circuit. In one embodiment, a fuse is arranged for both the positive circuit and the negative circuit. That is, the electrical element comprises a positive fuse 305 and a negative fuse 307. Of course, in other embodiments, the positive and negative circuits may not be provided with fuses as desired.

[0025] It is understood that the positive circuit means a circuit that connects a positive input terminal and a positive output terminal in the high-voltage box, and a positive voltage signal is input from the positive input terminal of the high-voltage box into the high-voltage box and transmitted through the positive circuit to the positive output terminal for output. The negative circuit means a circuit that connects a negative input terminal and a negative output terminal in the high-voltage box, and a negative voltage signal is input from the negative input terminal of the high-voltage box into the high-voltage box and transmitted through the negative circuit to the negative output terminal for output.

[0026] The battery management system 302 is arranged on one side of the receiving space near the first side wall 101, i.e., the battery management system 302 is arranged near the first side wall 101, and the battery management system 302 is closer to the first side wall 101 than to the second side wall 102. For example, the battery management system 302 can be attached to the first side wall 101, or the distance between the battery management system 302 and the first side wall 101 is smaller, e.g., the distance between the two is less than 5 mm, e.g., it can be 0 mm (i.e., the battery management system 302 is in contact with the first side wall 101), 2 mm, or 4 mm, etc.; the positive fuse 305 and the negative fuse 307 are arranged on one side of the receiving space near the second side wall 102, i.e.,The positive fuse 305 and the negative fuse 307 are arranged closer to the second side wall 102 than to the first side wall. For example, the positive fuse 305 and the negative fuse 307 may both be attached to the second side wall 102, or the distance between the positive fuse 305 and the negative fuse 307 may be smaller. It should be noted that the positive fuse 305 and the negative fuse 307 may be arranged at different positions near the second side wall 102 as desired.By arranging the battery management system 302 with the positive fuse 305 and the negative fuse 307 on both sides of the receiving space within the box body 10, the positive and negative fuses are kept away from the battery management system, electromagnetic interference from the fuses to the battery management system can be reduced, so that it is advantageous to reduce the effect of heat generated by the fuses on the battery management system.

[0027] In some embodiments, the distance between the battery management system 302 and the positive fuse 305 or the negative fuse 307 is in the range of 200 mm to 280 mm. For example, the distance between the battery management system 302 and the positive fuse 305 may be 210 mm, 215 mm, or 230 mm, etc., and the distance between the battery management system 302 and the negative fuse 307 may be 220 mm, 250 mm, 215 mm, or 270 mm, etc. By increasing the distance between the battery management system 302 and the positive fuse 305 and the negative fuse 307, the battery management system 302 is moved away from the positive fuse 305 and the negative fuse 307, and the electromagnetic interference effect of the fuses on the battery management system 302 can be effectively reduced.

[0028] The box body 10 further includes a third side wall 103, a fourth side wall 104, and a bottom plate (not shown); the first side wall 101, the third side wall 103, the second side wall 102, and the fourth side wall 104 are connected in sequence at the top and bottom, and the first side wall 101, the third side wall 103, the second side wall 102, and the fourth side wall 104 are connected to the periphery of the bottom plate to collectively enclose the receiving space. The box body 10 is a square box, for example, a rectangular box or a square box.

[0029] Optionally, the first side wall 101, the fourth side wall 104, and the second side wall 102 may be integrally formed bent members to which the third side wall 103 is connected by welding, ie, both ends of the third side wall 103 are fixed to the first side wall 101 and the second side wall 102, respectively, by welding.

[0030] The third side wall 103 is provided with a positive input terminal P+ and a negative input terminal P- on a side near the first side wall 101, and the third side wall 103 is provided with a positive output terminal B+ and a negative output terminal B- on a side near the second side wall 102. For example, as shown in Fig. 1, the positive input terminal P+ and the negative input terminal P- are arranged on the left side of the third side wall 103, the positive output terminal B+ and the negative output terminal B- are arranged on the right side of the third side wall 103.

[0031] The electrical element further includes an AC / DC power supply module 301, an isolation switch 303, a positive relay 304, a negative relay 306, and a shunt 308. The positive input terminal P+, the isolation switch 303, the positive relay 304, the positive fuse 305, and the positive output terminal B+ are sequentially connected to form the positive circuit. The negative input terminal P-, the isolation switch 303, the negative relay 306, the negative fuse 305, and the positive output terminal B- are sequentially connected to form the negative circuit. The battery management system 302 is connected to the AC / DC power supply module 301, the positive circuit, and the negative circuit.

[0032] Optionally, the AC / DC power supply module 301 can be arranged on the fourth side wall 104, the battery management system 302 is located at a corner between the first side wall 101 and the fourth side wall 104, and the AC / DC power supply module 301 is located between the fourth side wall 104 and the battery management system 302. The positive fuse 305 and the positive output terminal B+ are arranged in the same straight line, and the negative fuse 307 and the negative output terminal B- are arranged in the same straight line to facilitate the connection between the components.The negative relay 306 is arranged between the battery management system 302 and the negative fuse 307 to space the battery management system 302 and the negative fuse 307, and the positive fuse 305 can be arranged adjacent to the first side wall 101 so that the positive fuse 305 and the negative fuse 307 can be arranged as far away from the battery management system 302 as possible.

[0033] The electrical element further comprises a first temperature sensor 309 and a second temperature sensor 310 connected to the battery management system 302, wherein the first temperature sensor 309 is arranged next to the positive fuse 305 and the second temperature sensor 310 is arranged next to the negative fuse 307. Consequently, the first temperature sensor 309 and the second temperature sensor 310 can be used to monitor the temperature of heat-generating components, such as fuses, to prevent the temperature inside the box body from becoming too high and not being detected in time. In some embodiments, the distance between the first temperature sensor 309 and the positive fuse 305 is 18 mm to 22 mm, for example, 20 mm; the distance between the second temperature sensor 310 and the negative fuse 307 is 18 mm to 22 mm, for example, 20 mm.

[0034] The high-voltage box 100 may further include a display module that may be arranged on an outer surface of the first side wall 101 or on an outer surface of the cover 20 and that may be used to display the temperature data detected by the first temperature sensor 309 and the second temperature sensor 310.

[0035] In one embodiment of the present application, the components in the positive circuit and the negative circuit can be connected using copper rows, wherein the copper rows connecting the fuses are realized using copper rows with a larger cross-sectional area to increase the heat dissipation area. Specifically, the copper row with a first cross-sectional area is used to connect between the positive relay 304 and the positive fuse 305, between the positive fuse 305 and the positive output terminal B+, between the negative relay 306 and the negative fuse 307, and between the negative fuse 307 and the shunt 308, and the first cross-sectional area can be 2.5*40mm 2 -3.5*45mm 2 , e.g. 3*35 mm 2 In other embodiments, the first cross-sectional area may of course have other values, for example 3*38 mm 2or 3*40 mm 2 , etc.

[0036] The copper rows at other locations, such as the copper row between the isolation switch 303 and the positive input terminal P+ and the negative input terminal P-, and the copper row between the isolation switch 303 and the positive relay 304, can be copper rows with smaller cross-sectional area, such as copper rows with a cross-sectional area of ​​3*30 mm 2 to save space in the layout.

[0037] Furthermore, a heat sink 41 is arranged on the copper row between the positive relay 304 and the positive fuse 305, and a heat sink 42 is arranged on the copper row between the negative relay 306 and the negative fuse 307 to effectively reduce the operating temperature of the fuses. Optionally, the box body 10 is further provided with a fan 50, and the air outlet surface of the fan 50 faces the heat sink on at least one of the copper rows. As shown in Fig. 3, the fan 50 may be disposed on the second side wall 102, and the air outlet surface of the fan 50 faces the heat sink 41 and the heat sink 42 to further reduce the temperature rise of the fuses and improve the cooling effect on the fuses.

[0038] In one embodiment of the present application, the electrical element further comprises a balancing relay 311 and a pre-charging resistor 312; wherein the balancing relay 311 and the pre-charging resistor 312 are connected in series to form a balancing branch; the balancing branch is connected in parallel to the positive relay 304; the distance between the pre-charging resistor 312 and the battery management system 302 may be in the range of 130 mm to 150 mm, for example, it may be 135 mm or 145 mm, etc., so that the pre-charging resistor 312 and the battery management system 302 are spaced apart from each other, thereby reducing the electromagnetic interference of the pre-charging resistor 312 to the battery management system 302 and reducing the influence of the heat generated by the pre-charging resistor 312 on the battery management system 302.By adjusting the balancing branch, the problem of current circulation between the battery clusters can be alleviated.

[0039] The third side wall 103 is further provided with an auxiliary power connector J1, an MBMU (Master Battery Management Unit) communication connector J2, an SBMU (Slave Battery Management Unit) communication connector J3, a communication expansion connector J4, a slave power supply communication connector J5, a power indicator lamp L1, a fault indicator lamp L2, a lifting handle 1031, and a switch handle 1032 connected to the isolation switch 303.

[0040] The number of lifting handles 1031 is two, and the two lifting handles 1031 are located on each side of the third side panel 103. The auxiliary power connector J1 is connected to the AC / DC power supply module 301 via a 220V power harness 316. The communication expansion connector J4 can be used to connect an external termination resistor, allowing the termination resistor to be used in a compatible manner for multiple high-voltage boxes in the cluster stage. The power indicator lamp L1 and the fault indicator lamp L2 are located on each side of the switch handle 1032.

[0041] In one embodiment of the present application, the electrical element further comprises a Hall current sensor 317, wherein the Hall current sensor 317 is connected between the positive input terminal P+ and the isolation switch 303, thereby enabling current sensing.

[0042] In one embodiment of the present application, the connecting wire harness between the battery management system 302 and the AC / DC power supply module 301, the positive circuit, and the negative circuit includes a high-voltage wire harness 313 and a low-voltage wire harness 314. The high-voltage wire harness 313 and the low-voltage wire harness 314 are independent of each other, that is, the high-voltage wire harness 313 and the low-voltage wire harness 314 are separated from each other and led out individually, which can prevent mutual interference between the two and improve safety. In addition, an insulating layer can be wrapped around the outer surface of the high-voltage wire harness 313 to further improve absolute safety. As shown in Fig. 2, the battery management system 302 is connected to the AD / DC power supply module 301, the isolation switch 303, the first temperature sensor 309, the second temperature sensor 310, the positive relay 304, the positive fuse 305, the negative relay 306, the negative fuse 307, the fan 50, the equalizing relay 311, the Hall current sensor 317, the power indicator lamp L1, the MBMU communication port J2, the SBMU communication port J3, the communication expansion port J4, and the slave power supply communication port J5 via the low-voltage wiring harness 314;The battery management system 302 is also connected via the high-voltage wiring harness 313 to the copper series between the isolation switch 303 and the positive relay 304, the copper series between the isolation switch 303 and the negative relay 306, the copper series between the negative fuse 307 and the shunt 308, and the copper series between the positive fuse 305 and the positive output terminal B+. The battery management system 302 performs voltage detection via the high-voltage wiring harness 313, and the detection location is a single detection point, which can increase the reliability of the detection results.

[0043] The equalizing connection harness 315 in the equalizing branch circuit and other harnesses such as the high-voltage harness 313 and the low-voltage harness 314 are set separately.

[0044] In combination with the Fig. 3 and Fig. 4 illustrates Fig. 3 some of the pin connection of each component in the positive and negative circuits to the battery management system 302, e.g. SBMU-1:1 and SBMU-1:2 of the shunt 308 in Fig. 3 a positive sampling point and a negative sampling point, respectively, which are connected to the pins SH1:1 and SH1:2 of the battery management system 302 in Fig. 4 are connected; SBMU 1: 3 of the BAT_N node in Fig. 3 is connected to the negative total battery pin BAT_N in Fig. 4 connected; SBMU-F: 1 of the BAT_P node in Fig. 3 is connected to the positive total battery pin BAT_P in Fig. 4. The connection of the other components can be identified using the corresponding pin designations in the Fig. 3 and Fig. 4 and is not repeated here.

[0045] In the embodiment of the present application, a sealing ring 60 is arranged between the cover 20 and the box body 10, so that the entire high-voltage box 100 meets the protection class IP65. The end surfaces of the first to fourth side walls facing away from the base plate have an extension curved toward the receiving space, on which the sealing ring 60 is arranged.

[0046] The various technical features of the embodiments described above can be combined in any combination, and for the sake of brevity of description, not all possible combinations of the various technical features of the embodiments described above have been described; however, as long as there are no contradictions in the combinations of these technical features, they should be considered within the scope of the present specification as recorded herein.

[0047] The above-described embodiments express only some embodiments of the present application, which are described in a more specific and detailed manner, but are not to be understood as limiting the scope of the patent of the present application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present application, all of which fall within the scope of the present application. The scope of the present application is therefore determined by the appended claims.

Claims

[1] A high-voltage box (100), characterized in that it comprises: a box body (10) having an opening on its top, a cover (20) covering the opening of the box body (10), and an electrical element arranged in a receiving space within the box body (10), wherein the box body (10) comprises a first side wall (101) and a second side wall (102) which are opposite one another; the receiving space is arranged between the first side wall (101) and the second side wall (102); the electrical element comprises a battery management system (302), at least one of a positive fuse (305) on a positive circuit and a negative fuse (307) on a negative circuit; wherein the battery management system (302) is arranged on one side of the receiving space near the first side wall (101), and the at least one of the positive fuse (305) and the negative fuse (307) is arranged on one side of the receiving space near the second side wall (102). [2] High-voltage box (100) according to claim 1, wherein at least one of the following conditions is met: a distance between the battery management system (302) and the positive fuse (305) is in the range of 200 mm to 280 mm; and a distance between the battery management system (302) and the negative fuse (307) is in the range of 200 mm to 280 mm. [3] High voltage box (100) according to claim 1, wherein the electrical element comprises the positive fuse (305) and the negative fuse (307); the box body (10) further comprises a third side wall (103), a fourth side wall (104), and a bottom plate; wherein the first side wall (101), the third side wall (103), the second side wall (102), and the fourth side wall (104) are connected in sequence at the head and the tail, and the first side wall (101), the third side wall (103), the second side wall (102), and the fourth side wall (104) are connected to a periphery of the bottom plate to jointly enclose the receiving space; wherein the third side wall (103) is provided with a positive input terminal (P+) and a negative input terminal (P-) on a side near the first side wall (101), and the third side wall (103) is provided with a positive output terminal (B+) and a negative output terminal (B-) on a side near the second side wall (102); the electrical element further comprises an AC / DC power supply module (301), a balancing relay (310), a pre-charging resistor (311), an isolation switch (303), a positive relay (304), a negative relay (306), and a shunt (308); the positive input terminal (P+), the isolation switch (303), the positive relay (304), the positive fuse (305), and the positive output terminal (B+) are connected in series to form the positive circuit;the negative input terminal (P-), the isolation switch (303), the negative relay (306), the negative fuse (307), and the positive output terminal (B+) are connected in series to form the negative circuit; the balancing relay (310) and the pre-charging resistor (311) are connected in series to form a balancing branch; the balancing branch is connected in parallel to the positive relay (304); the battery management system (302) is connected to the AC / DC power supply module (301), the positive circuit, and the negative circuit. [4] The high-voltage box (100) according to claim 3, wherein the box body (10) is a square box; the battery management system (302) is located at a corner between the first side wall (101) and the fourth side wall (104), and the AC / DC power supply module (301) is located between the fourth side wall (104) and the battery management system (302); the positive fuse (305) and the positive output terminal (B+) are arranged in the same straight line, and the negative fuse (307) and the negative output terminal (B-) are arranged in the same straight line. [5] The high-voltage box (100) according to claim 3, wherein the first side wall (101), the fourth side wall (104), and the second side wall (102) are integrally formed bent members to which the third side wall (103) is connected by welding; a sealing ring (60) is arranged between the cover (20) and the box body (10). [6] The high-voltage box (100) of claim 1, wherein the electrical element further comprises a first temperature sensor (309) and a second temperature sensor (310) connected to the battery management system (302); the first temperature sensor (309) is disposed adjacent to the positive fuse (305) and the second temperature sensor (310) is disposed adjacent to the negative fuse (307). [7] The high-voltage box (100) according to claim 6, wherein a distance between the first temperature sensor (309) and the positive fuse (305) is 18 mm to 22 mm; a distance between the second temperature sensor (310) and the negative fuse (307) is 18 mm to 22 mm. [8] High-voltage box (100) according to claim 3, wherein the connections between the positive relay (304) and the positive fuse (305), between the positive fuse (305) and the positive output terminal (B+), between the negative relay (306) and the negative fuse (307), and between the negative fuse (307) and the shunt (308) are each made by a copper row with a first cross-sectional area, wherein the first cross-sectional area is 2.5*40mm 2 -3.5*45mm 2 amounts. [9] High voltage box (100) according to claim 3, wherein a heat sink (41) is arranged on the copper row between the positive relay (304) and the positive fuse (305), and another heat sink (42) is arranged on the copper row between the negative relay (306) and the negative fuse (307). [10] The high-voltage box (100) according to claim 9, wherein the box body (10) is further provided with a fan (50), and an air outlet surface of the fan (50) faces the heat sink (41, 42) on at least one of the copper rows. [11] The high-voltage box (100) according to claim 3, wherein a connecting wire harness between the battery management system (302) and the AC / DC power supply module (301), the positive circuit, and the negative circuit comprises a high-voltage wire harness (313) and a low-voltage wire harness (314); the high-voltage wire harness (313) and the low-voltage wire harness (314) are independent of each other; an insulating layer is wound around an outer surface of the high-voltage wire harness (313). [12] The high-voltage box (100) according to claim 3, wherein the third side wall (103) is further provided with an auxiliary power terminal (J1), a communication expansion terminal (J4), a slave power supply communication terminal (J5), an MBMU (Master Battery Management Unit) communication terminal (J2), an SBMU (Slave Battery Management Unit) communication terminal (J3), a power indicator lamp (L1), a fault indicator lamp (L2), a lifting handle (1031), and a switch handle (1032) connected to the isolation switch (303).

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