CN217361675U

CN217361675U - DCDC converter for fuel cell system and fuel cell system using same

Info

Publication number: CN217361675U
Application number: CN202220520850.4U
Authority: CN
Inventors: 刘萌; 黄振强; 赵勇富; 谢杨
Original assignee: Shenzhen Dayang Electric New Power Technology Co ltd
Current assignee: Shenzhen Dayang Electric New Power Technology Co ltd
Priority date: 2022-03-11
Filing date: 2022-03-11
Publication date: 2022-09-02
Anticipated expiration: 2032-03-11

Abstract

The utility model discloses a DCDC converter for fuel cell system and fuel cell system using the same, the DCDC converter comprises a box body, an inner cavity is arranged in the box body, a DC-DC boost conversion unit, a DC-DC main control board and a high voltage distribution module PDU are arranged in the inner cavity, the DC-DC boost conversion unit and the high voltage distribution module PDU are controlled by the DC-DC main control board, the box body comprises a first bottom board, a first frame and an upper cover, an input copper bar is arranged on the first bottom board, one end of the input copper bar protrudes out of the bottom surface of the first bottom board, the other end of the input copper bar extends into the inner cavity to be electrically connected with the input end of the DC-DC boost conversion unit, the outer side of the first bottom board protrudes out of the edge of the first frame to form a surrounding skirt edge, the DCDC converter structure provided by the scheme is convenient for integrating a fuel cell module and the DCDC converter into a whole, so that the first bottom board can be used as an end cover of a fuel cell module shell, therefore, the number of parts and the volume of the fuel cell system are reduced, the external lead connection is reduced, and the space utilization rate of the fuel cell system is increased.

Description

DCDC converter for fuel cell system and fuel cell system using same

The technical field is as follows:

the utility model relates to a DCDC converter and use its fuel cell system for fuel cell system.

Background art:

the fuel cell is a high-efficiency, high-power-density and pollution-free power generation system, and is widely applied to the field of new energy automobiles. The fuel cell has the disadvantages of soft output characteristics, slow dynamic response, large voltage variation range and the like. In order to better meet the requirement of the whole vehicle operation, a boosted DCDC is generally needed to achieve the purposes of voltage decoupling and power control, and is an indispensable important component in a fuel cell system.

In most current fuel cell systems, a fuel cell module and a DCDC converter are independent components, and the two components are connected by a high-voltage lead, so that the fuel cell system is large in product volume, large in number of parts and not compact enough in structure.

The invention content is as follows:

the utility model aims at providing a DCDC converter and use its fuel cell system can solve among the prior art fuel cell module and DCDC converter and all be independent part, leads to fuel cell system product bulky, and spare part is in large quantity, the not compact enough technical problem of structure.

The purpose of the utility model is realized by the following technical proposal.

The utility model aims at providing a DCDC converter for fuel cell system, the power distribution box comprises a box body, the inside inner chamber that sets up of box, be provided with DC-DC conversion unit that steps up in the inner chamber, the box includes first bottom plate, first frame and upper cover, the upper cover is installed respectively at the upper and lower both ends of first frame with first bottom plate, the inside of first bottom plate sets up the heat dissipation water course, install the input copper bar on the first bottom plate, the one end protrusion of input copper bar is in the bottom surface of first bottom plate, the other end of input copper bar stretches into in the inner chamber and is connected with DC-DC conversion unit's input electricity that steps up, the edge of the first frame of outside protrusion of first bottom plate is in order to form and surrounds the shirt rim.

The DC-DC boost conversion unit is used for boosting the direct current output by the fuel cell system, and then the direct current is processed and output by the high-voltage distribution module PDU.

Preferably, an insulation detection module is further disposed in the inner cavity, the insulation detection module is electrically connected to an input end of the DC-DC boost conversion unit to detect whether there is leakage, and an output end of the insulation detection module is electrically connected to the DC-DC main control board.

Preferably, an alternating current impedance detection module is further disposed in the inner cavity, an input end of the alternating current impedance detection module is electrically connected with an input end of the DC-DC boost conversion unit to detect impedance of the fuel cell system, and an output end of the alternating current impedance detection module is electrically connected with the DC-DC main control board.

Preferably, an air compressor driving module, a hydrogen return pump driving module and a water pump driving module are further arranged in the inner cavity, and the air compressor driving module, the hydrogen return pump driving module and the water pump driving module are respectively and electrically connected with the output end of the DC-DC boost conversion unit.

Preferably, a DC-DC boost conversion unit output interface, an air compressor output interface, a hydrogen return pump output interface, a water pump output interface and a high-voltage power distribution output interface are arranged on the first frame, the DC-DC boost conversion unit output interface is electrically connected with an output end of the DC-DC boost conversion unit, the air compressor output interface is electrically connected with an output end of the air compressor driving module, the hydrogen return pump output interface is electrically connected with an output end of the hydrogen return pump driving module, the water pump output interface is electrically connected with an output end of the water pump driving module, and the high-voltage power distribution output interface is electrically connected with an output end of the high-voltage power distribution module PDU.

Preferably, the DC-DC boost conversion unit is a non-isolated DC-DC boost circuit, and the non-isolated DC-DC boost circuit includes an energy storage inductor L1, a capacitor C2, a diode D1, and a switching transistor MOS 1.

Preferably, an input capacitor C1 and an input relay K1 are further arranged in the inner cavity, the input relay K1 is electrically connected between the positive input copper bar and the energy storage inductor L1, one end of the input capacitor C1 is electrically connected between the input relay K1 and the energy storage inductor L1, and the other end of the input capacitor C1 is electrically connected with the negative input copper bar.

Preferably, the output end of the DC-DC boost conversion unit is electrically connected to the input end of the air compressor driving module, the input end of the hydrogen return pump driving module and the input end of the water pump driving module respectively through an anti-reverse diode D2.

Preferably, a first pre-charging circuit, a second pre-charging circuit, a third pre-charging circuit and a discharging circuit are further arranged in the inner cavity, the first pre-charging circuit is used for charging the relay K1, the second pre-charging circuit is used for charging the diode D2, the third pre-charging circuit is used for charging the relay K5, and the discharging circuit is used for discharging the input capacitor C2.

Preferably, a first pre-charging circuit is connected with the relay K1 in parallel, and the first pre-charging circuit comprises a resistor R1 and a relay K2; a second pre-charging circuit is connected with the diode D2 in parallel, and the second pre-charging circuit comprises a resistor R3 and a relay K4; the third pre-charging circuit is connected with the relay K5 in parallel, and comprises a relay K6; and a bleeder circuit is connected with the input capacitor C2 in parallel, and comprises a resistor R2 and a relay K3.

Another object of the utility model is to provide a fuel cell system, including fuel cell module and DCDC converter, the fuel cell module includes casing and pile module, and the casing includes second bottom plate and second frame, and the second floor mounting encloses into the cavity in the bottom of second frame, and the pile module is installed in the cavity the inside, is provided with the output copper bar in the pile module, the DCDC converter adopts the aforesaid a DCDC converter for the fuel cell system, the first bottom plate of DCDC converter is installed at the top and the closing cap cavity of second frame, the input copper bar of DCDC converter stretch into the cavity the inside and be connected with the output copper bar electricity of pile module.

Compared with the prior art, the utility model, following effect has:

1) the utility model provides a DCDC converter for fuel cell system, through installing the input copper bar on first bottom plate, one end of input copper bar protrudes in the bottom surface of first bottom plate, the other end of input copper bar stretches into in the inner chamber and is connected with the input electricity of DC-DC boost conversion unit, the outside of first bottom plate protrudes the edge of first frame to form the surrounding skirt border, when using, the surrounding skirt border is locked on the casing of fuel cell module through the screw, make first bottom plate install the top of the second frame of casing and the cavity of closing cap casing, the input copper bar stretches into the cavity of casing and is connected with the output copper bar electricity of the pile module of fuel cell module, the DCDC converter structure that this scheme provided is convenient for integrate fuel cell module and DCDC converter, make the first bottom plate of DCDC converter can be used as the end cover of the casing of fuel cell module, therefore, the number of parts and the volume of the fuel cell system are reduced, external lead connection can be reduced, the space utilization rate of the fuel cell system is increased, and the structural quality of the fuel cell system is effectively controlled.

2) Other advantages of the present invention will be described in detail in the examples section.

Description of the drawings:

fig. 1 is a schematic perspective view of a DCDC converter according to an embodiment of the present invention;

fig. 2 is an exploded schematic diagram of a DCDC converter according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an internal layout structure of a DCDC converter according to an embodiment of the present invention;

fig. 4 is a schematic block diagram of a DCDC converter according to an embodiment of the present invention;

fig. 5 is a schematic circuit diagram of a DCDC converter according to an embodiment of the present invention;

fig. 6 is a schematic perspective view of a fuel cell system according to a second embodiment of the present invention;

fig. 7 is an exploded schematic view of a fuel cell system according to a second embodiment of the present invention.

The specific implementation mode is as follows:

the present invention will be described in further detail with reference to the following detailed description of preferred embodiments and accompanying drawings.

The first embodiment is as follows:

as shown in fig. 1 to fig. 3, the present embodiment provides a DCDC converter for a fuel cell system, which includes a case 1, an inner cavity 10 is disposed in the case 1, a DC-DC boost conversion unit 2, a DC-DC main control board 3 and a high voltage distribution module PDU4 are disposed in the inner cavity 10, the DC-DC boost conversion unit 2 and the high voltage distribution module PDU4 are controlled by the DC-DC main control board 3, direct current output by the fuel cell system is boosted by the DC-DC boost conversion unit 2 and then processed by the high voltage distribution module PDU4 and output, the case 1 includes a first bottom plate 11, a first frame 12 and an upper cover 13, the upper cover 13 and the first bottom plate 11 are respectively mounted at upper and lower ends of the first frame 12, a heat dissipation water channel is disposed in the first bottom plate 11, an input copper bar 5 is mounted on the first bottom plate 11, one end of the input copper bar 5 protrudes from a bottom surface of the first bottom plate 11, the other end of the input copper bar 5 extends into the inner cavity 10 and is electrically connected with the input end of the DC-DC boost conversion unit 2, the outer side of the first bottom plate 11 protrudes out of the edge of the first frame 12 to form an enclosing skirt 14, and a plurality of through holes are formed in the enclosing skirt 14; when the fuel cell system is used, the surrounding skirt 14 is locked on the shell 801 of the fuel cell module 80 through screws, so that the first bottom plate 11 is installed at the top of the second frame 8012 of the shell 801 and covers the cavity of the shell 801, the input copper bar 5 extends into the cavity of the shell 801 and is electrically connected with the output copper bar 803 of the stack module 802 of the fuel cell module 80, the structure of the DCDC converter 90 provided by the scheme is convenient for integrating the fuel cell module 80 and the DCDC converter 90, so that the first bottom plate 11 of the DCDC converter 90 can serve as an end cover of the shell 801 of the fuel cell module 80, the number and the volume of parts of the fuel cell system are reduced, the connection of external leads can be reduced, the space utilization rate of the fuel cell system is increased, and the structural quality of the fuel cell system is effectively controlled. The high-voltage distribution module PDU may also be referred to as a PDU distribution box (Power Distributor Unit abbreviated as PDU), and is designed for a hybrid electric vehicle, and is also commonly referred to as an "electric vehicle high-voltage distribution box" or an "electric vehicle central distribution box" or an "electric vehicle high-voltage distribution Unit" or the like.

As shown in fig. 3, an insulation detection module 6 is further disposed in the inner cavity 10, the insulation detection module 6 is electrically connected to an input end of the DC-DC boost conversion unit 2 to detect whether there is leakage, an output end of the insulation detection module 6 is electrically connected to the DC-DC main control board 3, when the insulation detection module 6 detects leakage, the insulation detection module 6 feeds back a leakage signal to the DC-DC main control board 3, and the DC-DC main control board 3 controls the DC-DC boost conversion unit 2 and the high-voltage power distribution module PDU4 to stop operating, so as to improve the safety of the fuel cell system during use.

As shown in fig. 4, an alternating current impedance detection module 7 is further disposed in the inner cavity 10, an input end of the alternating current impedance detection module 7 is electrically connected with an input end of the DC-DC boost conversion unit 2 to detect impedance of the fuel cell system, an output end of the alternating current impedance detection module 7 is electrically connected with the DC-DC main control board 3, the alternating current impedance detection module 7 is used for monitoring a real-time impedance value and feeding back a signal to the DC-DC main control board 3, so that the DC-DC main control board 3 can manage and regulate the DC-DC boost conversion unit 2 and the high-voltage distribution module PDU4 in real time according to the real-time impedance value, thereby improving performance of the fuel cell system and prolonging service life of the fuel cell system.

As shown in fig. 4 and 5, an air compressor driving module 8, a hydrogen return pump driving module 9, and a water pump driving module 20 are further disposed in the inner cavity 10, and the air compressor driving module 8, the hydrogen return pump driving module 9, and the water pump driving module 20 are respectively electrically connected to the output end of the DC-DC boost converting unit 2; the first frame 12 is provided with a DC-DC boost conversion unit output interface 30, an air compressor output interface 40, a hydrogen return pump output interface 50, a water pump output interface 60 and a high-voltage power distribution output interface 70, the DC-DC boost conversion unit output interface 30 is electrically connected with the output end of the DC-DC boost conversion unit 2, the air compressor output interface 40 is electrically connected with the output end of the air compressor driving module 8, the hydrogen return pump output interface 50 is electrically connected with the output end of the hydrogen return pump driving module 9, the water pump output interface 60 is electrically connected with the output end of the water pump driving module 20, and the high-voltage power distribution output interface 70 is electrically connected with the output end of the high-voltage power distribution module PDU 4; through setting up air compressor machine drive module 8, hydrogen return pump drive module 9 and water pump drive module 20, make DCDC converter 90's air compressor machine output interface 40, hydrogen return pump output interface 50 and water pump output interface 60 can directly export three-phase alternating current to the motor that direct drive air compressor machine, hydrogen return pump and water pump correspond and use has richened DCDC converter 90's function.

As shown in fig. 5, the DC-DC boost converting unit 2 is a non-isolated DC-DC boost circuit, which includes an energy storage inductor L1, a capacitor C2, a diode D1 and a switching transistor MOS 1; specifically, the input end of the energy storage inductor L1 is electrically connected to the positive input copper bar 5, the output end of the energy storage inductor L1 is electrically connected to the positive electrode of the diode D1, the capacitor C2 is electrically connected between the negative electrode of the diode D1 and the negative input copper bar 5, and the switching transistor MOS1 is electrically connected between the output end of the energy storage inductor L1 and the negative input copper bar 5.

As shown in fig. 5, an input capacitor C1 and an input relay K1 are further disposed in the inner cavity 10, the input relay K1 is electrically connected between the positive input copper bar 5 and the energy storage inductor L1, one end of the input capacitor C1 is electrically connected between the input relay K1 and the energy storage inductor L1, and the other end of the input capacitor C1 is electrically connected to the negative input copper bar 5.

As shown in fig. 5, the output end of the DC-DC boost conversion unit 2 is electrically connected to the input end of the air compressor driving module 8, the input end of the hydrogen-returning pump driving module 9, and the input end of the water pump driving module 20 through an anti-reverse diode D2, and the negative electrode of the anti-reverse diode D2, the input end of the air compressor driving module 8, the input end of the hydrogen-returning pump driving module 9, and the input end of the water pump driving module 20 are further electrically connected to a relay K5.

As shown in fig. 5, a first pre-charge circuit 100, a second pre-charge circuit 200, a third pre-charge circuit 300 and a discharge circuit 400 are further disposed in the inner cavity 10, the first pre-charge circuit 100 is used for charging the relay K1, the second pre-charge circuit 200 is used for charging the diode D2, the third pre-charge circuit 300 is used for charging the relay K5, and the discharge circuit 400 is used for discharging the input capacitor C2; specifically, the first pre-charging circuit 100 is connected in parallel with the relay K1, and the first pre-charging circuit 100 includes a resistor R1 and a relay K2; the second pre-charging circuit 200 is connected in parallel with the diode D2, and the second pre-charging circuit 200 comprises a resistor R3 and a relay K4; the third pre-charging circuit 300 is connected with the relay K5 in parallel, and the third pre-charging circuit 300 comprises a relay K6; the bleeder circuit 400 is connected in parallel with the input capacitor C2, and the bleeder circuit 400 comprises a resistor R2 and a relay K3; the design of the pre-charge circuit and the bleeder circuit 400 can improve the reliability of the internal circuit of the DCDC converter 90, thereby improving the safety of the DCDC converter 90 and prolonging the service life of the DCDC converter 90.

Example two:

as shown in fig. 6 and fig. 7, the present embodiment provides a fuel cell system, which includes a fuel cell module 80 and a DCDC converter 90, where the fuel cell module 80 includes a housing 801 and a stack module 802, the housing 801 includes a second bottom plate 8011 and a second rim 8012, the second bottom plate 8011 is mounted at the bottom of the second rim 8012 and encloses a cavity 804, the stack module 802 is mounted inside the cavity 804, an output copper bar 803 is disposed on the stack module 802, the DCDC converter 90 adopts a DCDC converter for a fuel cell system as described in the first embodiment, a first bottom plate 11 of the DCDC converter 90 is mounted at the top of the second rim 8012 and covers the cavity, an input copper bar 5 of the DCDC converter 90 extends into the cavity 804 and is electrically connected to the output copper bar 803 of the stack module 802, the output copper bar 803 is a female terminal structure, and the input copper bar 5 and the output copper bar 803 are electrically connected by way of inserting the copper bar 803, according to the scheme, the fuel cell module 80 and the DCDC converter 90 are integrated, so that the first bottom plate 11 of the DCDC converter 90 can serve as an end cover of the shell 801 of the fuel cell module 80, the number and the size of parts of the fuel cell system are reduced, external wire connection can be reduced, the space utilization rate of the fuel cell system is increased, and the structural quality of the fuel cell system is effectively controlled.

The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention are equivalent replacement modes, and are all included in the scope of the present invention.

Claims

1. The utility model provides a DCDC converter for fuel cell system, includes box (1), box (1) is inside to be set up an inner chamber (10), be provided with DC-DC conversion unit (2) that steps up in inner chamber (10), box (1) includes first bottom plate (11), first frame (12) and upper cover (13), the upper and lower both ends at first frame (12) are installed respectively in upper cover (13) and first bottom plate (11), the inside of first bottom plate (11) sets up heat dissipation water course, its characterized in that: install input copper bar (5) on first bottom plate (11), the one end protrusion in the bottom surface of first bottom plate (11) of input copper bar (5), the other end of input copper bar (5) stretches into in inner chamber (10) and is connected with the input electricity of DC-DC conversion unit (2) that steps up, and the edge of the outside protrusion first frame (12) of first bottom plate (11) is in order to form and surrounds shirt rim (14).

2. The DCDC converter for a fuel cell system according to claim 1, characterized in that: the inner cavity (10) is also internally provided with a DC-DC main control board (3) and a high-voltage power distribution module PDU (4), the DC-DC boost conversion unit (2) and the high-voltage power distribution module PDU (4) are controlled by the DC-DC main control board (3), and direct current output by the fuel cell system is boosted by the DC-DC boost conversion unit (2) and then processed and output by the high-voltage power distribution module PDU (4).

3. The DCDC converter for a fuel cell system according to claim 2, characterized in that: and an insulation detection module (6) is further arranged in the inner cavity (10), the insulation detection module (6) is electrically connected with the input end of the DC-DC boost conversion unit (2) to detect whether electric leakage exists or not, and the output end of the insulation detection module (6) is electrically connected with the DC-DC main control board (3).

4. The DCDC converter for a fuel cell system according to claim 3, characterized in that: an alternating current resistance detection module (7) is further arranged in the inner cavity (10), the input end of the alternating current resistance detection module (7) is electrically connected with the input end of the DC-DC boost conversion unit (2) to detect the impedance of the fuel cell system, and the output end of the alternating current resistance detection module (7) is electrically connected with the DC-DC main control board (3).

5. The DCDC converter for a fuel cell system according to claim 2, 3 or 4, characterized in that: still be provided with air compressor machine drive module (8), return hydrogen pump drive module (9) and water pump drive module (20) in inner chamber (10), air compressor machine drive module (8), return hydrogen pump drive module (9) and water pump drive module (20) respectively with the output electricity of DC-DC boost conversion unit (2) is connected.

6. The DCDC converter for a fuel cell system according to claim 5, wherein: be provided with DC-DC conversion unit output interface (30), air compressor machine output interface (40), hydrogen return pump output interface (50), water pump output interface (60) and high-voltage distribution output interface (70) on first frame (12), DC-DC conversion unit output interface (30) that steps up with the output electricity of DC-DC conversion unit (2) is connected, air compressor machine output interface (40) with the output electricity of air compressor machine drive module (8) is connected, hydrogen return pump output interface (50) with the output electricity of hydrogen return pump drive module (9) is connected, water pump output interface (60) with the output electricity of water pump drive module (20) is connected, high-voltage distribution output interface (70) with the output electricity of high-voltage distribution module PDU (4) is connected.

7. The DCDC converter for a fuel cell system according to claim 6, wherein: the DC-DC boost conversion unit (2) is a non-isolated DC-DC boost circuit, and the non-isolated DC-DC boost circuit comprises an energy storage inductor L1, a capacitor C2, a diode D1 and a switching tube MOS 1.

8. The DCDC converter for a fuel cell system according to claim 7, characterized in that: an input capacitor C1 and an input relay K1 are further arranged in the inner cavity (10), the input relay K1 is electrically connected between the positive input copper bar (5) and the energy storage inductor L1, one end of the input capacitor C1 is electrically connected between the input relay K1 and the energy storage inductor L1, and the other end of the input capacitor C1 is electrically connected with the negative input copper bar (5).

9. The DCDC converter for a fuel cell system according to claim 8, wherein: the output end of the DC-DC boost conversion unit (2) is electrically connected with the input end of the air compressor driving module (8), the input end of the hydrogen return pump driving module (9) and the input end of the water pump driving module (20) through an anti-reverse connection diode D2.

10. The DCDC converter for a fuel cell system according to claim 9, characterized in that: still be provided with first pre-charge circuit (100), second pre-charge circuit (200), third pre-charge circuit (300) and bleeder circuit (400) in inner chamber (10), first pre-charge circuit (100) are used for charging for relay K1, and second pre-charge circuit (200) are used for charging for diode D2, and third pre-charge circuit (300) are used for charging for relay K5, and bleeder circuit (400) are used for discharging for input capacitance C2.

11. The DCDC converter for a fuel cell system according to claim 10, wherein: the first pre-charging circuit (100) is connected with the relay K1 in parallel, and the first pre-charging circuit (100) comprises a resistor R1 and a relay K2; the second pre-charging circuit (200) is connected with the diode D2 in parallel, and the second pre-charging circuit (200) comprises a resistor R3 and a relay K4; the third pre-charging circuit (300) is connected with the relay K5 in parallel, and the third pre-charging circuit (300) comprises a relay K6; the bleeder circuit (400) is connected in parallel with the input capacitor C2, and the bleeder circuit (400) comprises a resistor R2 and a relay K3.

12. The utility model provides a fuel cell system, including fuel cell module (80) and DCDC converter (90), fuel cell module (80) includes casing (801) and galvanic pile module (802), casing (801) include second bottom plate (8011) and second frame (8012), second bottom plate (8011) is installed in the bottom of second frame (8012) and is enclosed into a cavity (804), galvanic pile module (802) are installed in the cavity, be provided with output copper bar (803) on galvanic pile module (802), its characterized in that: the DCDC converter (90) is the DCDC converter for the fuel cell system as claimed in any one of claims 1 to 11, the first bottom plate (11) of the DCDC converter (90) is mounted on top of the second rim (8012) and covers the cavity (804), and the input copper bar (5) of the DCDC converter (90) extends into the cavity and is electrically connected with the output copper bar (803) of the stack module (802).