High-voltage distribution box of electric automobile

Abstract

The utility model discloses a high-voltage distribution box of an electric automobile. The high-voltage distribution box comprises a box body, a driving circuit and a battery management system, wherein the driving circuit and the battery management system are arranged in the box body; wherein the battery management system is used for managing a power battery of the electric vehicle; the driving circuit comprises a discharging positive relay, a discharging negative relay, a first charging positive relay, a second charging positive relay, a first charging negative relay, a second charging negative relay and a plurality of branch positive relays, and the branch positive relays are used for controlling the number of connection systems; the box body comprises a first side face, a second side face, a third side face and a fourth side face, and a plurality of ports are arranged on the outer side of the side faces of the box body and connected with all the modules. According to the high-voltage distribution box of the electric automobile, the number of connecting systems can be controlled through the relays among the first branch system, the second branch system and the third branch system according to function requirements, and the integration degree is high; and the arrangement form of each component is reasonable, the structure is compact, and the safety is high.

Description

Technical Field

[0001] The utility model relates to the field of electric vehicles, in particular to a high-voltage distribution box of an electric vehicle. Background Art

[0002] At present, the power battery system of the whole vehicle generally adopts high-voltage and large-capacity battery packs, which usually require large current charging and discharging. The existing high-voltage distribution box has weak high-power charging and discharging capabilities and poor overload resistance, resulting in low safety during use; at the same time, the design cost and DV verification fee of non-standard high-voltage distribution boxes designed according to different application scenarios are high, which increases the cost of the whole vehicle; and the internal structure of the existing high-voltage distribution box is not compact enough and the volume is large; furthermore, the internal structure of the existing non-standard high-voltage distribution box is complex and the degree of integration is low, which cannot meet the free selection requirements of matching multi-branch systems according to actual needs. Summary of the invention

[0003] In order to solve the technical problems mentioned in the above background technology, the utility model proposes a high-voltage distribution box for electric vehicles with a simple and compact structure, a high degree of integration, high safety performance and capable of matching a multi-branch system.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A high-voltage distribution box for an electric vehicle, comprising:

[0006] A box body and a driving circuit and a battery management system disposed in the box body;

[0007] The battery management system is used to manage the power battery of electric vehicles;

[0008] The driving circuit comprises a discharge positive relay, a discharge negative relay, a first charge positive relay, a second charge positive relay, a first charge negative relay, a second charge negative relay and a plurality of branch positive relays, wherein the branch positive relays are used to control the number of connected systems;

[0009] The first end of the discharge positive relay is connected to the control end of the battery management system, the second end of the discharge positive relay is connected to the whole vehicle power end of the electric vehicle through the discharge positive plug-in, and the third end of the discharge positive relay is connected to the positive electrode of the power battery through the battery positive plug-in;

[0010] The first end of the discharge negative relay is connected to the control end of the battery management system, the second end of the discharge negative relay is connected to the whole vehicle power end of the electric vehicle through the discharge negative plug-in, and the third end of the discharge negative relay is connected to the negative electrode of the power battery through the battery negative plug-in;

[0011] The first end of the first charging positive relay is connected to the control end of the battery management system, the second end of the first charging positive relay is connected to the charging end of the electric vehicle through the first charging positive plug-in, and the third end of the first charging positive relay is connected to the positive electrode of the power battery through the battery positive plug-in;

[0012] A first end of the second charging positive relay is connected to a control end of the battery management system, a second end of the second charging positive relay is connected to a charging end of the electric vehicle through a second charging positive plug-in, and a third end of the second charging positive relay is connected to a positive electrode of the power battery through a battery positive plug-in;

[0013] A first end of the first charging negative relay is connected to a control end of the battery management system, a second end of the first charging negative relay is connected to a charging end of the electric vehicle through a first charging negative plug-in, and a third end of the first charging negative relay is connected to a negative electrode of the power battery through a battery negative plug-in;

[0014] A first end of the second charging negative relay is connected to a control end of the battery management system, a second end of the second charging negative relay is connected to a charging end of the electric vehicle through a second charging negative plug-in, and a third end of the second charging negative relay is connected to a negative electrode of the power battery through a battery negative plug-in;

[0015] The first ends of multiple branch positive relays are connected to the control end of the battery management system, the second ends of the branch positive relays are connected to the summary contacts of the discharge positive relay, the first charging positive relay and the second charging positive relay, and the third ends of the branch positive relays are connected to the positive pole of the power battery through the battery positive plug-in.

[0016] In a preferred embodiment of the utility model, the discharge positive plug-in includes a first discharge positive plug-in, a second discharge positive plug-in and a third discharge positive plug-in; the discharge negative plug-in includes a first discharge negative plug-in, a second discharge negative plug-in and a third discharge negative plug-in; the battery positive plug-in includes a first battery positive plug-in, a second battery positive plug-in, a third battery positive plug-in and a fourth battery positive plug-in; the battery negative plug-in includes a first battery negative plug-in, a second battery negative plug-in, a third battery negative plug-in and a fourth battery negative plug-in; the branch positive relay includes a first branch positive relay, a second branch positive relay and a third branch positive relay.

[0017] In a preferred embodiment of the utility model, the driving circuit further comprises a plurality of manual maintenance switches and a plurality of Hall current sensors, and a fuse is provided in each of the plurality of manual maintenance switches;

[0018] A first manual maintenance switch and a first Hall current sensor are connected in series in sequence between the first battery positive plug-in and the first branch positive relay;

[0019] A second manual maintenance switch and a second Hall current sensor are connected in series in sequence between the second battery positive plug-in and the second branch positive relay;

[0020] A third manual maintenance switch and a third Hall current sensor are connected in series in sequence between the third battery positive plug-in and the third branch positive relay;

[0021] A fourth manual maintenance switch and a fourth Hall current sensor are connected in series between the fourth battery positive plug-in and the discharge positive relay in sequence.

[0022] In a preferred embodiment of the present utility model, the driving circuit further comprises a shunt;

[0023] The first end of the shunt is connected to the control end of the battery management system, the second end of the shunt is connected to the control end of the battery management system, the third end of the shunt is connected to the negative pole of the power battery through the battery negative plug-in, and the fourth end of the shunt is connected to the summary contacts of the first charging negative relay, the second charging negative relay and the discharging negative relay.

[0024] In a preferred embodiment of the utility model, the drive circuit further comprises: a pre-charge relay, a heating positive relay and a heating negative relay;

[0025] The pre-charge relay is connected in parallel with the discharge positive relay;

[0026] A first end of the heating positive relay is connected to a control end of a battery management system, a second end of the heating positive relay is connected to a heating film through a heating connector, and a third end of the heating positive relay is connected to a collection contact of multiple branch positive relays;

[0027] The first end of the heating negative relay is connected to the control end of the battery management system, the second end of the heating negative relay is connected to the heating film through the heating connector, and the third end of the heating negative relay is connected to the summary contact of the first charging negative relay, the second charging negative relay and the discharging negative relay.

[0028] In a preferred embodiment of the present invention, the heating connector includes a first heating connector, a second heating connector, a third heating connector and a fourth heating connector.

[0029] In a preferred embodiment of the utility model, the drive circuit further comprises a plurality of manual maintenance switches, a plurality of Hall current sensors and shunts, and a fuse is provided in each of the plurality of manual maintenance switches;

[0030] A first manual maintenance switch and a first Hall current sensor are connected in series in sequence between the first battery positive plug-in and the first branch positive relay;

[0031] A second manual maintenance switch and a second Hall current sensor are connected in series in sequence between the second battery positive plug-in and the second branch positive relay;

[0032] A third manual maintenance switch and a third Hall current sensor are connected in series in sequence between the third battery positive plug-in and the third branch positive relay;

[0033] A fourth manual maintenance switch and a fourth Hall current sensor are connected in series between the fourth battery positive plug-in and the discharge positive relay in sequence;

[0034] The first end of the shunt is connected to the control end of the battery management system, the second end of the shunt is connected to the control end of the battery management system, the third end of the shunt is connected to the negative pole of the power battery through the battery negative plug-in, and the fourth end of the shunt is connected to the summary contacts of the first charging negative relay, the second charging negative relay and the discharging negative relay.

[0035] In a preferred embodiment of the present utility model, the box body comprises a first side surface, a second side surface, a third side surface and a fourth side surface;

[0036] A first manual maintenance switch, a second manual maintenance switch, a third manual maintenance switch and a fourth manual maintenance switch are sequentially arranged on the outer side of the first side of the box;

[0037] The second side surface of the box body is adjacent to the first side surface, and the outer side of the second side surface of the box body is sequentially provided with a fourth battery positive plug-in, a third battery positive plug-in, a second battery positive plug-in, a first battery positive plug-in, a first heating connector, a second heating connector, a third heating connector, a fourth heating connector and a plurality of low-voltage connecting devices from the battery control system to the battery and the whole vehicle, the first heating connector and the second heating connector are arranged in parallel with the third heating connector and the fourth heating connector, and the low-voltage connecting devices are arranged in parallel, and the low-voltage connecting devices are used for communication connection between the battery management system and the power battery and the power end of the whole vehicle;

[0038] The third side surface of the box body is adjacent to the second side surface, and a diagnostic connector, a fourth battery negative plug-in, a third battery negative plug-in, a second battery negative plug-in, a first battery negative plug-in, a second charging negative plug-in and a first charging negative plug-in are sequentially arranged on the outer side of the third side surface of the box body, and the diagnostic connector is used for software upgrade and fault diagnosis;

[0039] The fourth side surface of the box body is adjacent to the third side surface, and a breathable valve, a third discharge negative plug-in, a second discharge negative plug-in, a first discharge negative plug-in, a first discharge positive plug-in, a second discharge positive plug-in, a third discharge positive plug-in, a second charging positive plug-in and a first charging positive plug-in are sequentially arranged on the outer side of the fourth side surface of the box body, and the breathable valve is used to maintain the pressure balance inside the high-voltage distribution box.

[0040] In a preferred embodiment of the present invention, the internal cavity of the box includes:

[0041] The first manual maintenance switch and the first branch positive relay are connected via a copper busbar through which a first Hall current sensor is passed;

[0042] The second manual maintenance switch and the second branch positive relay are connected through a copper busbar with a second Hall current sensor;

[0043] The third manual maintenance switch and the third branch positive relay are connected through a copper busbar with a third Hall current sensor;

[0044] The fourth manual maintenance switch and the discharge positive relay are connected through a copper busbar through which a fourth Hall current sensor is passed;

[0045] The shunt and the discharge negative relay, the shunt and the first charge negative relay, and the shunt and the second charge negative relay are all connected through a copper busbar.

[0046] The box also contains:

[0047] Mounting feet, which are fixed to the four corners of the outer side of the box by welding, and the box is fixed to the whole vehicle through the mounting feet;

[0048] Two pairs of hanging ears, each pair of hanging ears is respectively arranged on the upper edge of the inner wall of the box body on the opposite sides, and the hanging ears are used to support the first metal plate;

[0049] A first metal plate, the first metal plate is arranged above the driving circuit, the short opposite sides of the first metal plate are respectively fixed on the hanging ears, and the first metal plate is used to fix the connecting copper bar between the first battery positive plug-in and the first manual maintenance switch, the connecting copper bar between the second battery positive plug-in and the second manual maintenance switch, the connecting copper bar between the third battery positive plug-in and the third manual maintenance switch, and the connecting copper bar between the fourth battery positive plug-in and the fourth manual maintenance switch;

[0050] A second metal plate, which is arranged below the driving circuit and fixed to the lower surface of the cavity inside the box body by bolts, and the relay, shunt, resistor and copper busbar of the driving circuit are all fixed on the second metal plate;

[0051] The third metal plate is arranged on the side of the driving circuit, and is fixed to the inner side of the second side surface of the box body by bolts. The third metal plate is used to fix the battery management system.

[0052] The utility model has the following advantages or beneficial effects:

[0053] 1. The utility model adopts a four-branch system setting, so the number of connected systems can be controlled by selecting branch relays according to functional needs, and the degree of integration is high;

[0054] 2. The high and low voltage wiring harnesses of the internal relays of the high voltage distribution box are arranged in two strands and are fixed to the metal base plate by cable ties. The wiring layout is neat and reasonable, and the multi-branch system setting can delete the internal circuit of the high voltage distribution box according to actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The embodiments of the present invention will be described more fully with reference to the attached drawings, which are however only used for illustration and description and are not intended to limit the scope of the present invention.

[0056] Figure 1 This is a schematic diagram of a driving circuit in an embodiment of the present utility model;

[0057] Figure 2 This is a schematic diagram of the first side structure of a high-voltage distribution box in an embodiment of the utility model.

[0058] Figure 3 This is a schematic diagram of the second side structure of the high-voltage distribution box in an embodiment of the utility model.

[0059] Figure 4 This is a third side structural schematic diagram of the high-voltage distribution box in an embodiment of the utility model.

[0060] Figure 5 This is a schematic diagram of the fourth side structure of the high-voltage distribution box in an embodiment of the utility model.

[0061] Figure 6 This is a top view structural schematic diagram A of a high-voltage distribution box in an embodiment of the present utility model.

[0062] Figure 7 FIG. 1 is a top view structural diagram B of a high-voltage distribution box in an embodiment of the utility model.

[0063] In the figure:

[0064] 1-discharge positive relay; 2-pre-charge relay; 3-first charge positive relay; 4-second charge positive relay; 5-third branch positive relay; 6-second branch positive relay; 7-first branch positive relay; 8-heating positive relay; 9-heating negative relay; 10-first charge negative relay; 11-second charge negative relay; 12-discharge negative relay; 13-first discharge positive plug-in; 14-second discharge positive plug-in; 15-third discharge positive plug-in; 16-first charge positive plug-in; 17-second charge positive plug-in; 18-first charge negative plug-in; 19-second charge negative plug-in; 20-first discharge negative plug-in; 21-second discharge negative plug-in; 22-third discharge negative plug-in; 23-first battery negative plug-in; 24-second battery negative plug-in; 25-third battery negative plug-in; 26-fourth battery negative plug-in; 2 7-fourth heating connector; 28-third heating connector; 29-second heating connector; 30 first heating connector; 31-first battery positive plug-in; 32-second battery positive plug-in; 33-third battery positive plug-in; 34-fourth battery positive plug-in; 35-fourth manual maintenance switch; 36-third manual maintenance switch; 37-second manual maintenance switch; 38-first manual maintenance switch; 39-intranet communication plug-in; 40-vehicle communication plug-in; 41-charging communication plug-in; 42-first metal plate; 43-third metal plate; 44-fourth Hall current sensor; 45-third Hall current sensor; 46-second Hall current sensor; 47-first Hall current sensor; 48-diagnostic connector; 49-vent valve; 50-second metal plate; 51-shunt; 52-mounting foot; 53-hanging ear. DETAILED DESCRIPTION

[0065] The present invention will be further described in detail below in conjunction with the embodiments in the accompanying drawings, but this does not constitute any limitation to the present invention.

[0066] The utility model includes a high-voltage distribution box for an electric vehicle, such as Figure 1 As shown, it includes: a box body and a driving circuit and a battery management system arranged in the box body.

[0067] The battery management system is used to manage the power batteries of electric vehicles.

[0068] The driving circuit comprises a discharge positive relay 1, a discharge negative relay 12, a first charging positive relay 3, a second charging positive relay 4, a first charging negative relay 10, a second charging negative relay 11 and a plurality of branch positive relays, and the branch positive relays are used to control the number of connected systems.

[0069] The first end of the discharge positive relay 1 is connected to the control end of the battery management system, the second end of the discharge positive relay 1 is connected to the vehicle power end of the electric vehicle through the discharge positive plug-in, and the third end of the discharge positive relay 1 is connected to the positive electrode of the power battery through the battery positive plug-in.

[0070] The first end of the discharge negative relay 12 is connected to the control end of the battery management system, the second end of the discharge negative relay 12 is connected to the vehicle power end of the electric vehicle through the discharge negative plug-in, and the third end of the discharge negative relay 12 is connected to the negative electrode of the power battery through the battery negative plug-in.

[0071] The first end of the first charging positive relay 3 is connected to the control end of the battery management system, the second end of the first charging positive relay 3 is connected to the charging end of the electric vehicle through the first charging positive plug-in 16, and the third end of the first charging positive relay 3 is connected to the positive electrode of the power battery through the battery positive plug-in.

[0072] The first end of the second charging positive relay 4 is connected to the control end of the battery management system, the second end of the second charging positive relay 4 is connected to the charging end of the electric vehicle through the second charging positive plug-in 17, and the third end of the second charging positive relay 4 is connected to the positive electrode of the power battery through the battery positive plug-in;

[0073] The first end of the first charging negative relay 10 is connected to the control end of the battery management system, the second end of the first charging negative relay 10 is connected to the charging end of the electric vehicle through the first charging negative plug-in 18, and the third end of the first charging negative relay 10 is connected to the negative electrode of the power battery through the battery negative plug-in.

[0074] The first end of the second charging negative relay 11 is connected to the control end of the battery management system, the second end of the second charging negative relay 11 is connected to the charging end of the electric vehicle through the second charging negative plug-in 19, and the third end of the second charging negative relay 11 is connected to the negative electrode of the power battery through the battery negative plug-in.

[0075] The first end of the branch positive relay is connected to the control end of the battery management system, the second end of the branch positive relay is connected to the summary contact of the discharge positive relay 1, the first charging positive relay 3 and the second charging positive relay 4, and the third end of the branch positive relay is connected to the positive pole of the power battery through the battery positive plug-in.

[0076] In a preferred embodiment of the utility model, the discharge positive plug-in includes a first discharge positive plug-in 13, a second discharge positive plug-in 14 and a third discharge positive plug-in 15. The discharge negative plug-in includes a first discharge negative plug-in 20, a second discharge negative plug-in 21 and a third discharge negative plug-in 22. The battery positive plug-in includes a first battery positive plug-in 31, a second battery positive plug-in 32, a third battery positive plug-in 33 and a fourth battery positive plug-in 34. The battery negative plug-in includes a first battery negative plug-in 23, a second battery negative plug-in 24, a third battery negative plug-in 25 and a fourth battery negative plug-in 26. The branch positive relay includes a first branch positive relay 7, a second branch positive relay 6 and a third branch positive relay 5.

[0077] Specifically, the number of systems that cannot be selected and connected according to functional requirements in the prior art. In the above embodiment, a four-circuit parallel connection is arranged inside the high-voltage distribution box, three pairs of discharge connectors and two pairs of charging plug-ins, the discharge connectors include a first discharge positive connector 13, a second discharge positive connector 14, a third discharge positive connector 15, a first discharge negative connector 20, a second discharge negative connector 21 and a third discharge negative connector 22, and the two pairs of charging plug-ins include a first charging positive plug-in 16, a second charging positive plug-in 17, a first charging negative plug-in 18 and a second charging negative plug-in 19, the number of interfaces can be flexibly selected according to different requirements, and the number of battery systems connected can also be selected according to functional requirements.

[0078] In a preferred embodiment of the present invention, Figure 1 As shown, the drive circuit also includes a plurality of manual maintenance switches and a plurality of Hall current sensors, and fuses are provided in the manual maintenance switches.

[0079] The first manual maintenance switch 38 and the first Hall current sensor 47 are connected in series between the first battery positive plug-in 31 and the first branch positive relay 7 in sequence.

[0080] The second manual maintenance switch 37 and the second Hall current sensor 46 are connected in series between the second battery positive plug-in 32 and the second branch positive relay 6 in sequence.

[0081] The third manual maintenance switch 36 and the third Hall current sensor 45 are connected in series between the third battery positive plug-in 33 and the third branch positive relay 5 in sequence.

[0082] A fourth manual maintenance switch 35 and a fourth Hall current sensor 44 are connected in series between the fourth battery positive plug-in 34 and the discharge positive relay 1 in sequence.

[0083] Specifically, in the above embodiment, in order to ensure the safety of the circuit, fuses are provided in the first manual maintenance switch 38, the second manual maintenance switch 37, the third manual maintenance switch 36 and the fourth manual maintenance switch 35. In order to monitor the change of the current in the loop, a first Hall current sensor 47, a second Hall current sensor 46, a third Hall current sensor 45 and a fourth Hall current sensor 44 are also provided.

[0084] In a preferred embodiment of the present utility model, the drive circuit further includes a shunt 51. The first end of the shunt 51 is connected to the control end of the battery management system, the second end of the shunt 51 is connected to the control end of the battery management system, the third end of the shunt 51 is connected to the negative electrode of the power battery through the battery negative plug-in, and the fourth end of the shunt 51 is connected to the summary contact of the first charging negative relay 10, the second charging negative relay 11 and the discharge negative relay 12.

[0085] Specifically, in the above embodiment, the current size in the loop can be calculated by the battery management system according to the voltage signal output by the shunt 51 to monitor the current and ensure safety.

[0086] In a preferred embodiment of the present invention, Figure 1 As shown, the driving circuit also includes: a pre-charging relay 2, a heating positive relay 8 and a heating negative relay 9.

[0087] The pre-charge relay 2 is connected in parallel with the discharge positive relay 1.

[0088] The first end of the heating positive relay 8 is connected to the control end of the battery management system, the second end of the heating positive relay 8 is connected to the heating film through the heating connector, and the third end of the heating positive relay 8 is connected to the summary contact of multiple branch positive relays.

[0089] The first end of the heating negative relay 9 is connected to the control end of the battery management system, the second end of the heating negative relay 9 is connected to the heating film through the heating connector, and the third end of the heating negative relay 9 is connected to the summary contacts of the first charging negative relay 10, the second charging negative relay 11 and the discharging negative relay 12.

[0090] In a preferred embodiment of the present invention, Figure 1 As shown, the heating connectors include a first heating connector 30 , a second heating connector 29 , a third heating connector 28 and a fourth heating connector 27 .

[0091] Specifically, in the above embodiment, in order to enable the utility model to be used in a low temperature environment, a heating positive relay 8 and a heating negative relay 9 are also arranged inside the high-voltage distribution box. The heating positive relay 8 and the heating negative relay 9 are connected to the heating film of the electric vehicle power battery through the first heating connector 30, the second heating connector 29, the third heating connector 28 and the fourth heating connector 27 to heat the power battery.

[0092] In a preferred embodiment of the present invention, Figure 1 As shown, the driving circuit further includes a plurality of manual maintenance switches, a plurality of Hall current sensors and a shunt 51, and fuses are provided in the manual maintenance switches.

[0093] The first manual maintenance switch 38 and the first Hall current sensor 47 are connected in series between the first battery positive plug-in 31 and the first branch positive relay 7 in sequence.

[0094] The second manual maintenance switch 37 and the second Hall current sensor 46 are connected in series between the second battery positive plug-in 32 and the second branch positive relay 6 in sequence.

[0095] The third manual maintenance switch 36 and the third Hall current sensor 45 are connected in series between the third battery positive plug-in 33 and the third branch positive relay 5 in sequence.

[0096] A fourth manual maintenance switch 35 and a fourth Hall current sensor 44 are connected in series between the fourth battery positive plug-in 34 and the discharge positive relay 1 in sequence.

[0097] The first end of the shunt 51 is connected to the control end of the battery management system, the second end of the shunt 51 is connected to the control end of the battery management system, the third end of the shunt 51 is connected to the negative electrode of the power battery through the battery negative plug-in, and the fourth end of the shunt 51 is connected to the summary contacts of the first charging negative relay 10, the second charging negative relay 11 and the discharging negative relay 12.

[0098] Specifically, in the above embodiment, the first Hall current sensor 47, the second Hall current sensor 46, the third Hall current sensor 45 and the fourth Hall current sensor 44 are all arranged in the positive circuit, and the change of the current in the circuit can be monitored by the Hall current sensor. The shunt 51 is arranged on the negative bus, and the current of the circuit can also be calculated by the battery management system according to the voltage signal output by the shunt 51. The dual-channel current monitoring solution composed of the Hall current sensor and the shunt 51 can effectively ensure the safety of the circuit.

[0099] Furthermore, the relays in the above embodiments may be deleted according to functional requirements.

[0100] In a preferred embodiment of the present invention, Figures 2 to 5As shown, the box body includes a first side, a second side, a third side and a fourth side.

[0101] A first manual maintenance switch 38 , a second manual maintenance switch 37 , a third manual maintenance switch 36 and a fourth manual maintenance switch 35 are sequentially arranged on the outer side of the first side of the box.

[0102] The second side surface of the box body is adjacent to the first side surface, and the outer side of the second side surface of the box body is sequentially provided with a fourth battery positive plug-in 34, a third battery positive plug-in 33, a second battery positive plug-in 32, a first battery positive plug-in 31, a first heating connector 30, a second heating connector 29, a third heating connector 28, a fourth heating connector 27, an intranet communication plug-in 39, a whole vehicle communication plug-in 40 and a charging communication plug-in 41. The first heating connector 30 and the second heating connector 29 are distributed in parallel with the third heating connector 28 and the fourth heating connector 27, and the intranet communication plug-in 39, the whole vehicle communication plug-in 40 and the charging communication plug-in 41 are distributed in parallel.

[0103] The third side surface of the box is adjacent to the second side surface, and the outer side of the third side surface of the box is sequentially provided with a diagnostic connector 48, a fourth battery negative plug-in 26, a third battery negative plug-in 25, a second battery negative plug-in 24, a first battery negative plug-in 23, a second charging negative plug-in 19 and a first charging negative plug-in 18.

[0104] The fourth side surface of the box body is adjacent to the third side surface, and the outer side of the fourth side surface of the box body is sequentially provided with a vent valve 49, a third discharge negative plug-in 22, a second discharge negative plug-in 21, a first discharge negative plug-in 20, a first discharge positive plug-in 13, a second discharge positive plug-in 14, a third discharge positive plug-in 15, a second charge positive plug-in 17 and a first charge positive plug-in 16.

[0105] Specifically, in the above embodiment, the intranet communication plug-in 39 is used to collect battery voltage, collect battery temperature and communicate with the battery management system; the vehicle communication plug-in 40 is used for the battery management system to communicate with the vehicle; the charging communication plug-in 41 is used for the battery management system to communicate with the charging equipment; the diagnostic connector 48 is used for software upgrades and fault diagnosis; the air valve 49 is used to maintain the internal pressure balance of the high-voltage distribution box.

[0106] Furthermore, the plug-ins in the above embodiment can be deleted according to actual usage, because the parallel four-branch system design will not affect the normal use of the high-voltage distribution box.

[0107] In a preferred embodiment of the present invention, Figure 6 As shown, the internal cavity of the box includes:

[0108] The first manual maintenance switch 38 and the first branch positive relay 7 are connected via a copper busbar through which the first Hall current sensor 47 is passed.

[0109] The second manual maintenance switch 37 and the second branch positive relay 6 are connected via a copper busbar through which the second Hall current sensor 46 is passed.

[0110] The third manual maintenance switch 36 and the third branch positive relay 5 are connected via a copper busbar through which the third Hall current sensor 45 is passed.

[0111] The fourth manual maintenance switch 35 and the discharge positive relay 1 are connected via a copper busbar through which the fourth Hall current sensor 44 is passed.

[0112] The shunt 51 and the discharge negative relay 12 , the shunt 51 and the first charge negative relay 10 , and the shunt 51 and the second charge negative relay 11 are all connected via copper bars.

[0113] Specifically, in the above embodiment, the connecting copper bar is divided into a connecting copper bar of the positive part and a connecting copper bar of the negative part, the right part is the connecting copper bar of the positive part, and the left part is the connecting copper bar of the negative part. The connecting copper bar of the positive part and the connecting copper bar of the negative part are separated from each other, which will not affect the actual use of the high-voltage distribution box and can also make the distribution inside the high-voltage distribution box more reasonable and safe.

[0114] In a preferred embodiment of the present invention, Figure 3 , Figure 6 and Figure 7 As shown, the box also includes:

[0115] The mounting feet 52 are fixedly connected to the four corners of the outer side of the box body by welding, and the box body is fixedly connected to the whole vehicle through the mounting feet 52.

[0116] Two pairs of hanging ears 53, each pair of hanging ears is respectively arranged on the upper edge of the inner wall on the opposite sides of the box body, and the hanging ears 53 are used to support the first metal plate.

[0117] The first metal plate 42 is arranged above the driving circuit, and the short opposite sides of the first metal plate 42 are respectively fixed on the hanging ears 53. The first metal plate 42 is used to fix the connecting copper bar between the first battery positive plug-in 31 and the first manual maintenance switch 38, the connecting copper bar between the second battery positive plug-in 32 and the second manual maintenance switch 37, the connecting copper bar between the third battery positive plug-in 33 and the third manual maintenance switch 36, and the connecting copper bar between the fourth battery positive plug-in 34 and the fourth manual maintenance switch 35.

[0118] The second metal plate 50 is arranged below the driving circuit. The second metal plate 50 is fixed to the lower surface of the internal cavity of the box body by bolts. Except for the battery management system, the relay, shunt, resistor and copper busbar of the driving circuit are all fixed on the second metal plate 50.

[0119] The third metal plate 43 is disposed on the side of the driving circuit. The third metal plate 43 is fixed to the inner side of the second side surface of the box body by bolts. The third metal plate 43 is used to fix the battery management system.

[0120] Specifically, in the above embodiment, the mounting foot 52 is fixedly connected to the vehicle by bolts. The connecting copper bars of the battery positive plug-in and the manual maintenance switch are fixed on the first metal plate 42, the relay, shunt, resistor and other copper bars of the drive circuit are fixed on the second metal plate 50, and the control harness, communication harness and high-voltage sampling harness of the relay are also fixed on the second metal plate 50 by cable ties, but maintain a certain height difference with the connecting copper bar to ensure safety performance. The control harness and communication harness of the relay are one strand of wiring, and the high-voltage sampling harness is another strand of wiring. The high and low voltage harnesses are arranged in two strands, which is not only convenient for wiring, but also the larger spacing between the two can avoid mutual interference. The battery management system is fixed on the third metal plate 43 on the inner side of the second side of the box body, which not only makes full use of the internal space of the high-voltage distribution box and reduces the design cost, but also makes the high-voltage distribution box highly integrated, compact and small, and will not occupy too much internal space of the electric vehicle.

[0121] The above embodiments of the utility model are described in detail, but the above contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the invention. All equivalent changes and improvements made within the scope of the utility model should still fall within the scope of this patent.

Claims

1. A high-voltage distribution box for an electric vehicle, characterized in that: include: A box body and a driving circuit and a battery management system disposed in the box body; The battery management system is used to manage the power battery of the electric vehicle; The driving circuit comprises a discharge positive relay, a discharge negative relay, a first charge positive relay, a second charge positive relay, a first charge negative relay, a second charge negative relay and a plurality of branch positive relays, wherein the branch positive relays are used to control the number of connected systems; The first end of the discharge positive relay is connected to the control end of the battery management system, the second end of the discharge positive relay is connected to the whole vehicle power end of the electric vehicle through the discharge positive plug-in, and the third end of the discharge positive relay is connected to the positive electrode of the power battery through the battery positive plug-in; The first end of the discharge negative relay is connected to the control end of the battery management system, the second end of the discharge negative relay is connected to the whole vehicle power end of the electric vehicle through the discharge negative plug-in, and the third end of the discharge negative relay is connected to the negative electrode of the power battery through the battery negative plug-in; The first end of the first charging positive relay is connected to the control end of the battery management system, the second end of the first charging positive relay is connected to the charging end of the electric vehicle through the first charging positive plug-in, and the third end of the first charging positive relay is connected to the positive electrode of the power battery through the battery positive plug-in; The first end of the second charging positive relay is connected to the control end of the battery management system, the second end of the second charging positive relay is connected to the charging end of the electric vehicle through the second charging positive plug-in, and the third end of the second charging positive relay is connected to the positive electrode of the power battery through the battery positive plug-in; The first end of the first charging negative relay is connected to the control end of the battery management system, the second end of the first charging negative relay is connected to the charging end of the electric vehicle through the first charging negative plug-in, and the third end of the first charging negative relay is connected to the negative electrode of the power battery through the battery negative plug-in; The first end of the second charging negative relay is connected to the control end of the battery management system, the second end of the second charging negative relay is connected to the charging end of the electric vehicle through the second charging negative plug-in, and the third end of the second charging negative relay is connected to the negative electrode of the power battery through the battery negative plug-in; The first ends of the multiple branch positive relays are connected to the control end of the battery management system, the second ends of the branch positive relays are connected to the summary contacts of the discharge positive relay, the first charging positive relay and the second charging positive relay, and the third ends of the branch positive relays are connected to the positive electrode of the power battery through the battery positive plug-in.

2. A high-voltage distribution box for an electric vehicle according to claim 1, characterized in that: The discharge positive plug-in includes a first discharge positive plug-in, a second discharge positive plug-in and a third discharge positive plug-in; the discharge negative plug-in includes a first discharge negative plug-in, a second discharge negative plug-in and a third discharge negative plug-in; the battery positive plug-in includes a first battery positive plug-in, a second battery positive plug-in, a third battery positive plug-in and a fourth battery positive plug-in; the battery negative plug-in includes a first battery negative plug-in, a second battery negative plug-in, a third battery negative plug-in and a fourth battery negative plug-in; the branch positive relay includes a first branch positive relay, a second branch positive relay and a third branch positive relay.

3. A high-voltage distribution box for an electric vehicle according to claim 2, characterized in that: The driving circuit further comprises a plurality of manual maintenance switches and a plurality of Hall current sensors, wherein the plurality of manual maintenance switches are each provided with a fuse; A first manual maintenance switch and a first Hall current sensor are connected in series in sequence between the first battery positive plug-in and the first branch positive relay; A second manual maintenance switch and a second Hall current sensor are connected in series in sequence between the second battery positive plug-in and the second branch positive relay; A third manual maintenance switch and a third Hall current sensor are connected in series in sequence between the third battery positive plug-in and the third branch positive relay; A fourth manual maintenance switch and a fourth Hall current sensor are connected in series between the fourth battery positive plug-in and the discharge positive relay.

4. A high-voltage distribution box for an electric vehicle according to claim 3, characterized in that: The driving circuit further comprises a shunt; The first end of the shunt is connected to the control end of the battery management system, the second end of the shunt is connected to the control end of the battery management system, the third end of the shunt is connected to the negative electrode of the power battery through the battery negative plug-in, and the fourth end of the shunt is connected to the summary contact of the first charging negative relay, the second charging negative relay and the discharging negative relay.

5. A high-voltage distribution box for an electric vehicle according to claim 2, characterized in that: The driving circuit also includes: a pre-charging relay, a heating positive relay and a heating negative relay; The pre-charge relay is connected in parallel with the discharge positive relay; The first end of the heating positive relay is connected to the control end of the battery management system, the second end of the heating positive relay is connected to the heating film through the heating connector, and the third end of the heating positive relay is connected to the aggregation contact of the multiple branch positive relays; The first end of the heating negative relay is connected to the control end of the battery management system, the second end of the heating negative relay is connected to the heating film through the heating connector, and the third end of the heating negative relay is connected to the summary contact of the first charging negative relay, the second charging negative relay and the discharging negative relay.

6. A high-voltage distribution box for an electric vehicle according to claim 5, characterized in that: The heating connectors include a first heating connector, a second heating connector, a third heating connector and a fourth heating connector.

7. A high-voltage distribution box for an electric vehicle according to claim 6, characterized in that: The driving circuit further comprises a plurality of manual maintenance switches, a plurality of Hall current sensors and shunts, and the plurality of manual maintenance switches are each provided with a fuse; A first manual maintenance switch and a first Hall current sensor are connected in series in sequence between the first battery positive plug-in and the first branch positive relay; A second manual maintenance switch and a second Hall current sensor are connected in series in sequence between the second battery positive plug-in and the second branch positive relay; A third manual maintenance switch and a third Hall current sensor are connected in series in sequence between the third battery positive plug-in and the third branch positive relay; A fourth manual maintenance switch and a fourth Hall current sensor are connected in series in sequence between the fourth battery positive plug-in and the discharge positive relay; The first end of the shunt is connected to the control end of the battery management system, the second end of the shunt is connected to the control end of the battery management system, the third end of the shunt is connected to the negative electrode of the power battery through the battery negative plug-in, and the fourth end of the shunt is connected to the summary contact of the first charging negative relay, the second charging negative relay and the discharging negative relay.

8. A high-voltage distribution box for an electric vehicle according to claim 7, characterized in that: The box body comprises a first side surface, a second side surface, a third side surface and a fourth side surface; The first manual maintenance switch, the second manual maintenance switch, the third manual maintenance switch and the fourth manual maintenance switch are sequentially arranged on the outer side of the first side of the box; The second side surface of the box body is adjacent to the first side surface, and the fourth battery positive plug-in, the third battery positive plug-in, the second battery positive plug-in, the first battery positive plug-in, the first heating connector, the second heating connector, the third heating connector, the fourth heating connector and a plurality of low-voltage connection devices from the battery control system to the battery and the whole vehicle are sequentially arranged on the outer side of the second side surface of the box body, the first heating connector and the second heating connector are arranged in parallel with the third heating connector and the fourth heating connector, and the low-voltage connection devices are arranged in parallel, and the low-voltage connection devices are used for communication connection between the battery management system and the power battery and the power end of the whole vehicle; The third side surface of the box is adjacent to the second side surface, and a diagnostic connector, the fourth battery negative plug-in, the third battery negative plug-in, the second battery negative plug-in, the first battery negative plug-in, the second charging negative plug-in and the first charging negative plug-in are sequentially arranged on the outer side of the third side surface of the box, and the diagnostic connector is used for software upgrade and fault diagnosis; The fourth side surface of the box body is adjacent to the third side surface, and a ventilation valve, the third discharge negative plug-in, the second discharge negative plug-in, the first discharge negative plug-in, the first discharge positive plug-in, the second discharge positive plug-in, the third discharge positive plug-in, the second charging positive plug-in and the first charging positive plug-in are sequentially arranged on the outer side of the fourth side surface of the box body, and the ventilation valve is used to maintain the pressure balance inside the high-voltage distribution box.

9. A high-voltage distribution box for an electric vehicle according to claim 8, characterized in that: The internal cavity of the box body includes: The first manual maintenance switch and the first branch positive relay are connected via a copper busbar with a first Hall current sensor; The second manual maintenance switch and the second branch positive relay are connected via a copper busbar with a second Hall current sensor; The third manual maintenance switch and the third branch positive relay are connected via a copper busbar with a third Hall current sensor; The fourth manual maintenance switch and the discharge positive relay are connected via a copper busbar with a fourth Hall current sensor; The shunt and the discharge negative relay, the shunt and the first charge negative relay, and the shunt and the second charge negative relay are all connected via a copper busbar.

10. A high voltage distribution box for an electric vehicle according to claim 9, characterized in that: The box also includes: Mounting feet, the mounting feet are fixedly connected to the four corners of the outer side of the box body by welding, and the box body is fixedly connected to the whole vehicle through the mounting feet; Two pairs of hanging ears, each pair of the hanging ears is respectively arranged on the upper edges of the inner walls on the opposite sides of the box body, and the hanging ears are used to support the first metal plate; A first metal plate, the first metal plate is arranged above the driving circuit, the short opposite sides of the first metal plate are respectively fixed to the hanging ears, and the first metal plate is used to fix the connecting copper bar between the first battery positive plug-in and the first manual maintenance switch, the connecting copper bar between the second battery positive plug-in and the second manual maintenance switch, the connecting copper bar between the third battery positive plug-in and the third manual maintenance switch, and the connecting copper bar between the fourth battery positive plug-in and the fourth manual maintenance switch; A second metal plate, the second metal plate is arranged below the driving circuit, the second metal plate is fixed to the lower surface of the inner cavity of the box body by bolts, and the relay, shunt, resistor and copper busbar of the driving circuit are all fixed on the second metal plate; A third metal plate is disposed on the side of the driving circuit, and is fixed to the inner side of the second side surface of the box body by bolts. The third metal plate is used to fix the battery management system.

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