阅读说明：本技术 燃料电池系统的高压箱 (High-pressure tank of fuel cell system ) 是由 陈建平 林业发 吴炎花 季文姣 徐吉林 李然 于 2019-08-16 设计创作，主要内容包括：本发明公开了一种燃料电池系统的高压箱,包括箱体和内部电路,内部电路包括高压正极铜排、高压负极铜排、燃料电池正极铜排、燃料电池负极铜排、高压输出回路、高压上电预充回路、空压机供电回路、水泵供电回路、升压DC-DC模块、燃料电池主接触器、燃料电池放电回路和绝缘监测模块；箱体上设置有燃料电池连接器、动力电池连接器、低压控制回路连接器、水泵电源连接器、空压机电源连接器以及冷却水进出接口。本发明提供的高压箱减少了线束的使用及误连接,减少了对燃料电池控制器的资源的占用,让整个燃料电池系统更加紧凑；快速拨插的连接器方便与系统零部件对接,降低了燃料电池汽车整车装配难度,提高了动力系统部件的集成度和可靠性。(The invention discloses a high-voltage box of a fuel cell system, which comprises a box body and an internal circuit, wherein the internal circuit comprises a high-voltage positive electrode copper bar, a high-voltage negative electrode copper bar, a fuel cell positive electrode copper bar, a fuel cell negative electrode copper bar, a high-voltage output circuit, a high-voltage power-on pre-charging circuit, an air compressor power supply circuit, a water pump power supply circuit, a boosting DC-DC module, a fuel cell main contactor, a fuel cell discharging circuit and an insulation monitoring module; the box body is provided with a fuel cell connector, a power cell connector, a low-voltage control loop connector, a water pump power connector, an air compressor power connector and a cooling water inlet and outlet interface. The high-voltage box provided by the invention reduces the use and the misconnection of the wiring harness, reduces the occupation of resources of the fuel cell controller, and makes the whole fuel cell system more compact; the quick-pull-plug connector is convenient to be in butt joint with system parts, the whole assembly difficulty of the fuel cell automobile is reduced, and the integration level and the reliability of power system parts are improved.)

1. A high-pressure tank of a fuel cell system is characterized by comprising a tank body and an internal circuit, wherein the internal circuit is arranged in the tank body;

the internal circuit comprises a high-voltage positive electrode copper bar, a high-voltage negative electrode copper bar, a fuel cell positive electrode copper bar, a fuel cell negative electrode copper bar, a high-voltage output circuit, a high-voltage power-on pre-charging circuit, an air compressor power supply circuit, a water pump power supply circuit, a boosting DC-DC module, a fuel cell main contactor, a fuel cell discharging circuit and an insulation monitoring module;

the box body is provided with a fuel cell connector, a power cell connector, a low-voltage control loop connector, a water pump power connector, an air compressor power connector and a cooling water inlet and outlet interface;

the low-voltage control loop connector is used for accessing a 24V control power supply and a CAN bus controlled by a fuel cell controller;

the boosting DC-DC module comprises a low-voltage side anode, a low-voltage side cathode, a high-voltage side anode and a high-voltage side cathode;

the high-voltage output circuit comprises a first fuse and a second contactor, wherein the first end of the first fuse is connected with the positive electrode of the power battery connector, the second end of the first fuse is connected with the first end of the second contactor, the second end of the second contactor is connected with the high-voltage positive copper bar, and the negative electrode of the power battery connector is connected with the high-voltage negative copper bar;

the high-voltage power-on pre-charging circuit comprises a first contactor and a first power resistor, wherein a first end of the first contactor is connected with the high-voltage positive copper bar, a second end of the first contactor is connected with a first end of the first power resistor, and a second end of the first power resistor is connected with a second end of the first protection circuit;

the water pump power supply loop comprises a third fuse, the first end of the third fuse is connected with the high-voltage positive copper bar, the second end of the third fuse is connected with the positive electrode of the water pump power supply connector, and the negative electrode of the water pump power supply connector is connected with the high-voltage negative copper bar;

the power supply circuit of the air compressor comprises a fourth fuse, wherein the first end of the fourth fuse is connected with the high-voltage positive copper bar, the second end of the fourth fuse is connected with the positive electrode of the power connector of the air compressor, and the negative electrode of the power connector of the air compressor is connected with the high-voltage negative copper bar;

the fuel cell discharging loop comprises a fourth contactor and a second power resistor, wherein the first end of the fourth contactor is connected with the cathode copper bar of the fuel cell, the second end of the fourth contactor is connected with the first end of the second power resistor, and the second end of the second power resistor is connected with the anode copper bar of the fuel cell;

the first end of the insulation monitoring module is connected with the cathode copper bar of the fuel cell, and the second end of the insulation monitoring module is connected with the anode copper bar of the fuel cell;

the boost DC-DC module further comprises four switching value output ports, and the boost DC-DC module outputs four on-off control signals to the first contactor, the second contactor, the fourth contactor and the fuel cell main contactor through the four switching value output ports so as to realize on-off control of each contactor;

the high-voltage side anode is connected with the high-voltage anode copper bar, and the high-voltage side cathode is connected with the high-voltage cathode copper bar; the low-voltage side anode is connected with the first end of the fuel cell main contactor, the second end of the fuel cell main contactor is connected with the fuel cell anode copper bar, and the fuel cell anode copper bar is also connected with the anode of the fuel cell connector; the low-voltage side cathode is connected with the fuel cell cathode copper bar, and the fuel cell cathode copper bar is also connected with the cathode of the fuel cell connector;

the 24V control power supply supplies power to the boost DC-DC module, the insulation monitoring module, the first contactor, the second contactor, the fourth contactor and the fuel cell main contactor;

the boosting DC-DC module and the insulation monitoring module are connected with the CAN bus.

2. The high pressure tank of a fuel cell system according to claim 1, wherein a heater power connector is further provided on the tank body; the internal circuit further comprises a heater power supply loop;

the heater power supply loop comprises a third contactor and a second fuse, wherein the first end of the third contactor is connected with the high-voltage positive copper bar, the second end of the third contactor is connected with the first end of the second fuse, the second end of the second fuse is connected with the positive electrode of the heater power supply connector, and the negative electrode of the heater power supply connector is connected with the high-voltage negative copper bar;

the boost DC-DC module further comprises a fifth switching value output port, and the boost DC-DC module outputs a fifth switching control signal to the third contactor through the fifth switching value output port so as to realize switching control;

the 24V control power supply also supplies power to the third contactor.

3. The high pressure tank of a fuel cell system according to claim 1, wherein a 24V power connector is further provided on the tank body; the internal circuit further comprises a 24V power supply output module;

the 24V power supply output module comprises a fifth fuse and a 24V power supply module; the 24V control power supply also supplies power to the 24V power supply module; the 24V power supply module is connected with the CAN bus; the first end of the fifth fuse is connected with the high-voltage positive copper bar, the second end of the fifth fuse is connected with the high-voltage side input positive electrode of the 24V power module, the high-voltage side input negative electrode of the 24V power module is connected with the high-voltage negative copper bar, the low-voltage side output positive electrode of the 24V power module is connected with the positive electrode of the 24V power connector, and the low-voltage side output negative electrode of the 24V power module is connected with the negative electrode of the 24V power connector.

4. The high pressure tank of the fuel cell system of claim 3, further comprising a water-cooled plate on which the step-up DC-DC module and the 24V power module are mounted.

5. The high pressure tank of a fuel cell system of claim 1, wherein the second contactor and the fuel cell main contactor each have an auxiliary contact, the boost DC-DC module further includes a first switching value input port and a second switching value input port, the boost DC-DC module further collects a signal on the auxiliary contact of the second contactor through the first switching value input port, and the boost DC-DC module further collects a signal on the auxiliary contact of the fuel cell main contactor through the second switching value input port.

6. The high pressure tank of a fuel cell system of claim 1, wherein the tank is an IP67 rated tank, the high pressure tank including all connectors that are IP67 rated quick-connect, pluggable connectors.

7. The high pressure tank of a fuel cell system according to claim 6, wherein the tank is a sealed tank with a gas balance valve.

8. The high-pressure tank of the fuel cell system according to any one of claims 1 to 7, wherein the low-pressure control circuit connector is a low-pressure connector, and the high-pressure tank includes other connectors each being a high-pressure connector having an interlock signal output;

the boost DC-DC module also comprises a plurality of expanded switching value input ports, and the number of the expanded switching value input ports is the same as that of the high-voltage connectors; each expanded switching value input port is connected with an interlocking signal output end of one high-voltage connector;

and the boost DC-DC module also acquires a signal on the interlocking signal output end of the corresponding high-voltage connector through the expanded switching value input port.

9. The high pressure tank of a fuel cell system of claim 1, wherein the insulation monitoring module comprises an insulation monitor.

10. The high pressure tank of a fuel cell system according to claim 1, wherein the 24V control power source includes a 24V + port and a 24V-port; the CAN bus includes a CANL port and a CANH port.

Technical Field

The invention relates to the field of high-pressure tanks, in particular to a high-pressure tank of a fuel cell system.

Background

Electric vehicles equipped with fuel cell systems are known to have low emission pollution, high energy conversion efficiency, and low operating noise, and mass production versions of fuel cell passenger vehicles are currently developed in japan and korea, and fuel cell commercial vehicles in europe and america are also continuously demonstrated to operate. In China, in recent years, fuel cell vehicles have great advantages in the market of commercial vehicles compared with pure electric routes, and the development of fuel cell vehicles is also trending.

Although fuel cell commercial vehicles are advantageous, few fuel cell commercial vehicles are being developed, and most fuel cell commercial vehicles are transformed from pure electric commercial vehicles which are developed earlier. In the process of the fuel cell automobile reconstruction integration, a plurality of problems are encountered. The method specifically comprises the following steps: a plurality of accessories of the system need to use power supplies when the fuel cell system runs, and the power supplies and wiring are inconvenient; meanwhile, the electric energy with softer fuel cell characteristic needs to be provided with an electric energy output channel after being boosted, but only one high-voltage output interface is provided by the whole vehicle, so that the fuel cell commercial vehicle transformed by the pure electric commercial vehicle is inconvenient to supply power. In addition, because the number of discrete components in the existing fuel cell system is large, the fuel cell controller needs to communicate with each discrete component respectively to realize control, so that more resources of the fuel cell controller are occupied, too many wiring harnesses are involved, difficulty in installation is high, misconnection is easily caused to influence system reliability, and the discrete components are subjected to decentralized management, and too many connection wiring harnesses make the occupied space of the whole fuel cell system larger.

Disclosure of Invention

The invention aims to overcome the defects that in the prior art, the power supply in a fuel cell system in a fuel cell commercial vehicle transformed from a pure electric commercial vehicle is inconvenient, more resources of a fuel cell controller are occupied, too many wire harnesses are involved, the difficulty in installation is high, the reliability is affected by misconnection easily, and the occupied space is large, and provides a high-pressure tank of the fuel cell system, which has the advantages of simple structure, less occupied resources, more compact whole system, low assembly difficulty, high integration level and high reliability.

The invention solves the technical problems through the following technical scheme:

the invention provides a high-voltage box of a fuel cell system, which comprises a box body and an internal circuit, wherein the internal circuit is arranged in the box body;

the internal circuit comprises a high-voltage positive electrode copper bar, a high-voltage negative electrode copper bar, a fuel cell positive electrode copper bar, a fuel cell negative electrode copper bar, a high-voltage output circuit, a high-voltage power-on pre-charging circuit, an air compressor power supply circuit, a water pump power supply circuit, a boosting DC-DC (power converter) module, a fuel cell main contactor, a fuel cell discharging circuit and an insulation monitoring module;

the box body is provided with a fuel cell connector, a power cell connector, a low-voltage control loop connector, a water pump power connector, an air compressor power connector and a cooling water inlet and outlet interface;

the low-voltage control loop connector is used for accessing a 24V (volt) control power supply and a CAN (Controller Area Network) bus controlled by a fuel cell Controller;

the boosting DC-DC module comprises a low-voltage side anode, a low-voltage side cathode, a high-voltage side anode and a high-voltage side cathode;

the high-voltage output circuit comprises a first fuse and a second contactor, wherein the first end of the first fuse is connected with the positive electrode of the power battery connector, the second end of the first fuse is connected with the first end of the second contactor, the second end of the second contactor is connected with the high-voltage positive copper bar, and the negative electrode of the power battery connector is connected with the high-voltage negative copper bar;

the high-voltage power-on pre-charging circuit comprises a first contactor and a first power resistor, wherein a first end of the first contactor is connected with the high-voltage positive copper bar, a second end of the first contactor is connected with a first end of the first power resistor, and a second end of the first power resistor is connected with a second end of the first protection circuit;

the water pump power supply loop comprises a third fuse, the first end of the third fuse is connected with the high-voltage positive copper bar, the second end of the third fuse is connected with the positive electrode of the water pump power supply connector, and the negative electrode of the water pump power supply connector is connected with the high-voltage negative copper bar;

the power supply circuit of the air compressor comprises a fourth fuse, wherein the first end of the fourth fuse is connected with the high-voltage positive copper bar, the second end of the fourth fuse is connected with the positive electrode of the power connector of the air compressor, and the negative electrode of the power connector of the air compressor is connected with the high-voltage negative copper bar;

the fuel cell discharging loop comprises a fourth contactor and a second power resistor, wherein the first end of the fourth contactor is connected with the cathode copper bar of the fuel cell, the second end of the fourth contactor is connected with the first end of the second power resistor, and the second end of the second power resistor is connected with the anode copper bar of the fuel cell;

the first end of the insulation monitoring module is connected with the cathode copper bar of the fuel cell, and the second end of the insulation monitoring module is connected with the anode copper bar of the fuel cell;

the boost DC-DC module further comprises four switching value output ports, and the boost DC-DC module outputs four on-off control signals to the first contactor, the second contactor, the fourth contactor and the fuel cell main contactor through the four switching value output ports so as to realize on-off control of each contactor;

the high-voltage side anode is connected with the high-voltage anode copper bar, and the high-voltage side cathode is connected with the high-voltage cathode copper bar; the low-voltage side anode is connected with the first end of the fuel cell main contactor, the second end of the fuel cell main contactor is connected with the fuel cell anode copper bar, and the fuel cell anode copper bar is also connected with the anode of the fuel cell connector; the low-voltage side cathode is connected with the fuel cell cathode copper bar, and the fuel cell cathode copper bar is also connected with the cathode of the fuel cell connector;

the 24V control power supply supplies power to the boost DC-DC module, the insulation monitoring module, the first contactor, the second contactor, the fourth contactor and the fuel cell main contactor;

the boosting DC-DC module and the insulation monitoring module are connected with the CAN bus.

Preferably, a heater power connector is further arranged on the box body; the internal circuit further comprises a heater power supply loop;

the heater power supply loop comprises a third contactor and a second fuse, wherein the first end of the third contactor is connected with the high-voltage positive copper bar, the second end of the third contactor is connected with the first end of the second fuse, the second end of the second fuse is connected with the positive electrode of the heater power supply connector, and the negative electrode of the heater power supply connector is connected with the high-voltage negative copper bar;

the boost DC-DC module further comprises a fifth switching value output port, and the boost DC-DC module outputs a fifth switching control signal to the third contactor through the fifth switching value output port so as to realize switching control;

the 24V control power supply also supplies power to the third contactor.

Preferably, a 24V power connector is further disposed on the box body; the internal circuit further comprises a 24V power supply output module;

the 24V power supply output module comprises a fifth fuse and a 24V power supply module; the 24V control power supply also supplies power to the 24V power supply module; the 24V power supply module is connected with the CAN bus; the first end of the fifth fuse is connected with the high-voltage positive copper bar, the second end of the fifth fuse is connected with the high-voltage side input positive electrode of the 24V power module, the high-voltage side input negative electrode of the 24V power module is connected with the high-voltage negative copper bar, the low-voltage side output positive electrode of the 24V power module is connected with the positive electrode of the 24V power connector, and the low-voltage side output negative electrode of the 24V power module is connected with the negative electrode of the 24V power connector.

Preferably, the high-voltage box further comprises a water-cooling plate, and the boost DC-DC module and the 24V power module are both mounted on the water-cooling plate.

Preferably, the second contactor and the fuel cell main contactor are provided with auxiliary contacts, the boost DC-DC module further comprises a first switching value input port and a second switching value input port, the boost DC-DC module further collects signals on the auxiliary contacts of the second contactor through the first switching value input port, and the boost DC-DC module further collects signals on the auxiliary contacts of the fuel cell main contactor through the second switching value input port.

Preferably, the cabinet is an IP67 (a level of security) rated cabinet and the high-voltage cabinet includes all connectors that are IP67 rated quick-connect and disconnect connectors.

Preferably, the box body is a sealed box body with a gas balance valve.

Preferably, the low-voltage control circuit connector is a low-voltage connector, and other connectors included in the high-voltage box are high-voltage connectors with interlocking signal output ends;

the boost DC-DC module also comprises a plurality of expanded switching value input ports, and the number of the expanded switching value input ports is the same as that of the high-voltage connectors; each expanded switching value input port is connected with an interlocking signal output end of one high-voltage connector;

and the boost DC-DC module also acquires a signal on the interlocking signal output end of the corresponding high-voltage connector through the expanded switching value input port.

Preferably, the insulation monitoring module comprises an insulation monitor.

Preferably, the 24V control power supply comprises a 24V + port and a 24V-port; the CAN bus includes a CANL port and a CANH port.

The positive progress effects of the invention are as follows: the high-voltage box of the fuel cell system provided by the invention integrates a high-voltage output loop, a high-voltage power-on pre-charging loop, a heater power supply loop, a water pump power supply loop, an air compressor power supply loop, a 24V power supply module, a boosting DC-DC module, a fuel cell main contactor, a fuel cell discharging loop and an insulation monitoring module in a box body. Various electrical components which are generally separately placed in the prior art and need to be used by the fuel cell system are integrated into a box body in a unified manner, the structure is simple, the manufacture is convenient, and the whole fuel cell system is more compact. The low-voltage control return circuit in the high-voltage box only has four lines, 24V control power supply is two respectively, the CAN bus is two, greatly reduce the use and the misconnection of pencil, CAN control the operation of high-voltage box through CAN bus communication, reduce the resource that occupies fuel cell controller, be favorable to fuel cell system's operation and energy output very much, both sides are equipped with the connector of inserting of dialling fast, conveniently dock with system spare part, fuel cell car whole car assembly difficulty has been reduced, the integrated level and the reliability of driving system part have been improved.

Drawings

Fig. 1 is a schematic external view of a high pressure tank of a fuel cell system according to a preferred embodiment of the present invention.

Fig. 2 is a schematic view of the inside of a high-pressure tank of a fuel cell system according to a preferred embodiment of the present invention.

Detailed Description

The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.

As shown in fig. 1 and 2, the present embodiment provides a high-pressure tank of a fuel cell system, including a tank body, a water-cooling plate (not shown in the drawings), and an internal circuit provided in the tank body. The box body is provided with a fuel cell connector, a power cell connector, a low-voltage control circuit connector, a water pump power connector, an air compressor power connector, a heater power connector, a 24V power connector and a cooling water inlet and outlet interface. Wherein the box body is an IP 67-grade sealed box body with a gas balance valve. All connectors included in the high-pressure tank are IP 67-grade quick-connect and disconnect connectors that can be easily mated with various components of the fuel cell system. The low-voltage control circuit connector is a low-voltage connector, and other connectors included in the high-voltage box are all high-voltage connectors with interlocking signal output ends.

The internal circuit in the embodiment comprises a high-voltage positive electrode copper bar, a high-voltage negative electrode copper bar, a fuel cell positive electrode copper bar, a fuel cell negative electrode copper bar, a high-voltage output circuit, a high-voltage power-on pre-charging circuit, an air compressor power supply circuit, a water pump power supply circuit, a heater power supply circuit, a 24V power supply output module, a boosting DC-DC module, a fuel cell main contactor K5, a fuel cell discharging circuit and an insulation monitoring module. The insulation monitoring module is realized by adopting an insulation monitor and is used for solving the insulation monitoring of the fuel cell system and ensuring the safety of the system.

In this embodiment, the low voltage control loop connector is used to access a 24V control power supply and a CAN bus controlled by the fuel cell controller. The 24V control power supply and the CAN bus form a low-voltage control loop. The 24V control power supply comprises a 24V + port and a 24V-port, and the CAN bus comprises a CANL port and a CANH port. Wherein the 24V control power supply and the fuel cell controller are both arranged outside the high-pressure tank, the 24V control power supply is a vehicle-mounted power supply, and the fuel cell controller is part of the fuel cell system. The low-voltage control loop is only provided with four wires, namely two wires of a 24V control power supply and two wires of a CAN bus, so that the use and the error connection of a wire harness in the fuel cell system are greatly reduced, the fault diagnosis is convenient, and the resource occupation of a fuel cell controller CAN be reduced.

In this embodiment, the boost DC-DC module includes a low-voltage side positive electrode, a low-voltage side negative electrode, a high-voltage side positive electrode, and a high-voltage side negative electrode. Specifically, the boost DC-DC module comprises three power interfaces, wherein the first part is a power interface for accessing a 24V control power supply to enable the boost DC-DC module to normally operate, the second part is a low-voltage side anode and a low-voltage side cathode which are used for accessing a power supply provided by the fuel cell, and the third part is a high-voltage side anode and a high-voltage side cathode which are interfaces of a high-voltage power supply for outputting the power supply provided by the fuel cell after the boost DC-DC module boosts the power supply provided by the fuel cell.

In this embodiment, the high voltage output circuit includes first insurance FU1 and second contactor K2, and the first end of first insurance FU1 is connected with the positive pole of power battery connector, and the second end of first insurance FU1 is connected with the first end of second contactor K2, and the second end and the anodal copper bar of high pressure of second contactor K2 are connected, and the negative pole copper bar of power battery connector are connected.

In this embodiment, the high-voltage power-on precharge circuit includes a first contactor K1 and a first power resistor R1, a first end of the first contactor K1 is connected to the high-voltage positive copper bar, a second end of the first contactor K1 is connected to a first end of the first power resistor R1, and a second end of the first power resistor R1 is connected to a second end of the first safety FU 1.

In this embodiment, the heater power supply circuit includes a third contactor K3 and a second fuse FU2, a first end of the third contactor K3 is connected to the high-voltage positive copper bar, a second end of the third contactor K3 is connected to a first end of the second fuse FU2, a second end of the second fuse FU2 is connected to the positive electrode of the heater power connector, and the negative electrode of the heater power connector is connected to the high-voltage negative copper bar. When the cold start of the fuel cell system is realized without external auxiliary hot start, the heater power supply loop is used as a standby loop to supply power for subsequent equipment needing a high-voltage power supply.

In this embodiment, the water pump power supply circuit includes third insurance FU3, and the first end of third insurance FU3 is connected with high-voltage positive copper bar, and the second end of third insurance FU3 is connected with the positive pole of water pump power connector, and the negative pole of water pump power connector is connected with high-voltage negative copper bar. Wherein, the water pump power supply is the essential power supply of the fuel cell system, and the pre-charging is needed when the high voltage is electrified.

In this embodiment, the power supply circuit of the air compressor includes fourth fuse FU4, the first end of fourth fuse FU4 is connected with the high-voltage positive copper bar, the second end of fourth fuse FU4 is connected with the positive pole of the power connector of the air compressor, and the negative pole of the power connector of the air compressor is connected with the high-voltage negative copper bar. The power supply of the air compressor is a necessary power supply of the fuel cell system, and pre-charging is needed when the high-voltage power is on.

In this embodiment, the 24V power output module includes a fifth safety FU5 and a 24V power module. The 24V power module is a voltage reduction DC-DC module and is used for reducing high voltage into 24V low voltage and outputting the low voltage to the outside of the high voltage box to supply power for the fuel cell system, so that the problem that the 24V power supply of the fuel cell system has large power requirement and the whole vehicle cannot provide enough power is solved. The first end of the fifth fuse FU5 is connected with a high-voltage positive copper bar, the second end of the fifth fuse FU5 is connected with the high-voltage side input positive electrode of the 24V power supply module, the high-voltage side input negative electrode of the 24V power supply module is connected with a high-voltage negative copper bar, the low-voltage side output positive electrode of the 24V power supply module is connected with the positive electrode of the 24V power supply connector, and the low-voltage side output negative electrode of the 24V power supply module is connected with the negative electrode of the 24V power supply connector.

In this embodiment, the fuel cell discharging circuit includes a fourth contactor K4 and a second power resistor R2, a first end of the fourth contactor K4 is connected to the negative copper bar of the fuel cell, a second end of the fourth contactor K4 is connected to a first end of the second power resistor R2, and a second end of the second power resistor R2 is connected to the positive copper bar of the fuel cell. The second power resistor R2 is a discharge resistor, and discharges through the discharge resistor, so that the problem that the fuel cell stack is unfavorable due to large current ripple when the fuel cell system is shut down and discharges through the boost DC-DC module is solved.

In this embodiment, the boost DC-DC module is integrally installed on the water-cooling plate in the box body. The boost DC-DC module comprises a control panel inside, the control panel expands driving resources on the basis of the existing control panel, and specifically comprises an expanded switching value output port and an expanded switching value input port, and the control panel CAN control all contactors in the high-voltage box through CAN communication commands besides controlling the boost DC-DC module. The method specifically includes outputting five switching control signals to a first contactor K1, a second contactor K2, a third contactor K3, a fourth contactor K4 and a fuel cell main contactor K5 through five switching value output ports, namely, one switching value output port is connected with one contactor to achieve switching control over each contactor. And acquiring the interlocking signals of each high-voltage connector through a plurality of expanded switching value input ports respectively, namely connecting one expanded switching value input port with the interlocking signal output end of one high-voltage connector to diagnose whether the connector has loose faults or not.

In the embodiment, the high-voltage side anode is connected with a high-voltage anode copper bar, and the high-voltage side cathode is connected with a high-voltage cathode copper bar; the low-voltage side positive electrode is connected with the first end of a fuel cell main contactor K5, the second end of the fuel cell main contactor K5 is connected with a fuel cell positive electrode copper bar, and the fuel cell positive electrode copper bar is also connected with the positive electrode of a fuel cell connector; the low-voltage side cathode is connected with a cathode copper bar of the fuel cell, and the cathode copper bar of the fuel cell is also connected with the cathode of the fuel cell connector. The fuel cell main contactor K5 is integrated in the high-voltage box, and is used for timely disconnecting the fuel cell from the fuel cell system under extreme conditions, thereby ensuring the operation safety of the system and simultaneously reducing the problem of large volume of the fuel cell caused by integration into the fuel cell.

In this embodiment, the first end of the insulation monitoring module is connected to the cathode copper bar of the fuel cell, and the second end of the insulation monitoring module is connected to the anode copper bar of the fuel cell.

In this embodiment, the capacities of all contactors and fuses are determined by calculating the power of the fuel cell system and the consumption of the accessory load, which is not limited herein.

In the embodiment, the 24V control power supply supplies power to the boosting DC-DC module, the 24V power supply module, the insulation monitoring module, the first contactor K1, the second contactor K2, the third contactor K3, the fourth contactor K4 and the fuel cell main contactor K5. The boost DC-DC module, the insulation monitoring module and the 24V power module are connected with a CAN bus, and the fuel cell controller realizes control and monitoring of the operation of the modules through the CAN bus.

In this embodiment, the boost DC-DC module and the 24V power module are integrally installed on the water-cooling plate in the box body, so as to ensure a better heat dissipation effect.

In this embodiment, the second contactor K2 and the fuel cell main contactor K5 are provided with auxiliary contacts, the step-up DC-DC module further includes a first switching value input port and a second switching value input port, and the step-up DC-DC module further collects signals on the auxiliary contacts of the second contactor K2 and the fuel cell main contactor K5 through the first switching value input port and the second switching value input port, respectively, so as to diagnose adhesion of the corresponding contactors.

For a better understanding of the present invention, the operation principle of the high-pressure tank of the fuel cell system provided in the present embodiment during specific use is explained as follows:

when the fuel cell system is ready to operate, a fuel cell connector, a power cell connector, a low-voltage control loop connector, a heater power connector, a water pump power connector, an air compressor power connector, a 24V power connector and a cooling water inlet and outlet interface are connected; then a 24V control power supply is arranged on the whole vehicle, the 24V control power supply is provided for a high-voltage box through a low-voltage control loop connector, and a boost DC-DC module, a 24V power supply module, an insulation monitor and all contactors obtain control power; the modules start to work after obtaining control electricity and feed back various states including high-voltage interlocking to the fuel cell controller through the CAN bus, when the whole vehicle sends an instruction for starting the fuel cell system to the fuel cell controller, the fuel cell controller judges whether the power-on initialization state of the high-voltage box CAN run or not, and if no fault is reported, the controller sends an instruction for starting the high-voltage box through the CAN bus. Firstly, high-voltage power-on pre-charging is carried out, the first contactor K1 is closed, the boost DC-DC module, the water pump, the air compressor and the 24V power module start pre-charging, the fuel cell controller receives the high-voltage side voltage of the boost DC-DC module and the power battery voltage in real time, when the high-voltage side voltage of the boost DC-DC module reaches ninety percent of the power battery voltage, the second contactor K2 is closed, the first contactor K1 is separated, and pre-charging is completed. If the heater power supply is needed, a CAN command is sent to close the third contactor K3; the fuel cell controller sends a command for enabling the 24V power supply module, and the 24V power supply module starts to work; and when the insulation value returned by the insulation monitor meets the starting condition of the fuel cell, closing the fifth contactor K5, and completing the preparation of the state of the high-voltage box before the starting of the fuel cell system. Before the fuel cell is started, the electric energy flows from the power cell to the high-pressure box, and after the fuel cell is started, the electric energy flows from the fuel cell to the high-pressure box and then flows from the high-pressure box to the power cell. When the fuel cell is blown to complete shutdown, the second contactor K2 and the fuel cell main contactor K5 are disconnected, at the moment, the low-power discharge resistor in the boosting DC-DC module automatically discharges for the high-voltage positive copper bar and the high-voltage negative copper bar of the high-voltage box, the fourth contactor K4 is closed, the fuel cell starts to discharge, the fourth contactor K4 is disconnected after the discharge is completed, and the high-voltage box is shut down.

The high-voltage box of the fuel cell system provided by the embodiment overcomes the defects that the discrete components of the existing fuel cell system are arranged at multiple positions and the power supply is inconvenient, and provides the all-in-one high-voltage box of the fuel cell system, and the high-voltage output circuit, the high-voltage power-on pre-charging circuit, the air compressor power supply circuit, the water pump power supply circuit, the heater power supply circuit, the 24V power module, the boosting DC-DC module, the fuel cell main contactor, the fuel cell discharging circuit, the insulation monitoring module and other functions are integrated in the high-voltage box, and the functional modules required by a plurality of systems are integrated in the all-in-one high-voltage box, so that the use of the fuel cell system is facilitated, the integration level of the electrical components of the system. The problem of fuel cell system electric energy distribution, annex get the inconvenience of electricity and fuel cell air compressor machine, water pump, the DC-DC module that steps up need high pressure to be charged the preliminary charge is solved. In a plurality of discrete electric component unification integrated to a high-voltage box of unifying more, the connection of inside high casting die is through a small amount of copper bars, it is big to solve electric component many places and put occupation space, uses the problem of a large amount of high-pressure pencil when connecting through the pencil. The interaction of the parts in the high-voltage box and the fuel cell controller is realized through a CAN bus, so that the condition that the resources of the fuel cell controller are required to be utilized when the enabling equipment and the on-off contactor are connected in an existing implementation mode is avoided.

The high-voltage box of the fuel cell system provided by the embodiment realizes the high integration of the power supply of the electrical parts of the fuel cell system and the high-voltage safety unified management, solves the difficult problems of multiple places of each electrical part of the fuel cell system and inconvenient electricity taking of high-voltage parts, greatly reduces the use of wire harnesses, and is very convenient for the whole vehicle integration and assembly of a fuel cell vehicle.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.