CN211929631U - Overvoltage protection device and fuel cell system - Google Patents
Overvoltage protection device and fuel cell system Download PDFInfo
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- CN211929631U CN211929631U CN202020368886.6U CN202020368886U CN211929631U CN 211929631 U CN211929631 U CN 211929631U CN 202020368886 U CN202020368886 U CN 202020368886U CN 211929631 U CN211929631 U CN 211929631U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The utility model belongs to the technical field of fuel cell system spare part, a overvoltage protector and fuel cell system are related to. The overvoltage protection device comprises a shell, wherein an anode air inlet pipe orifice, a cathode air inlet pipe orifice and an exhaust pipe orifice are arranged on the shell, an internal cavity of the shell is divided into a first cavity and a second cavity, a first elastic part and a reciprocating mechanism are arranged in the first cavity, one end of the first elastic part, which is far away from the cathode air inlet pipe orifice, is connected with the reciprocating mechanism, and the other end of the reciprocating mechanism is connected with a pressure release valve arranged at a position close to the anode air inlet pipe orifice; the first elastic piece is compressed under the first overvoltage protection state, the reciprocating motion mechanism is driven to move towards the direction of the cathode air inlet pipe orifice along the axial direction of the first elastic piece, and the pressure release valve is opened, so that the anode gas flowing into the second cavity through the pressure release valve is discharged from the exhaust pipe orifice. The overvoltage protection device can effectively protect the fuel cell stack and prolong the service life of the fuel cell stack.
Description
Technical Field
The utility model belongs to the technical field of fuel cell system spare part, especially an overvoltage protector and fuel cell system.
Background
The fuel cell stack is formed by stacking a plurality of single cells, and a gas flow channel inside each single cell is divided into two cavities: the electrolytic water reverse reaction is realized through the catalysis effect, the electric energy, the water and the heat are released, but the membrane electrode is easy to damage when the pressure difference between the anode and the cathode is too large, so that the gas is leaked, namely the hydrogen is leaked to the cathode cavity or the air is leaked to the anode cavity. In addition, a maximum withstand pressure also exists between the anode and the cathode of the fuel cell stack and the external atmosphere, and when the internal pressure of the cavity exceeds the maximum withstand pressure, the problem of gas leakage is easy to occur, namely hydrogen or air in the stack leaks to the external environment.
The anode working medium of the fuel cell system is hydrogen and is stored through the high-pressure storage tank, when the fuel cell system works, gas is released from the high-pressure storage tank, is preliminarily decompressed through the mechanical decompression valve and enters the fuel cell system, and the pressure is further reduced through the hydrogen spraying valve in the system, so that the hydrogen meeting the working pressure requirement of the pile is provided. However, with the operation of the fuel cell system, hydrogen in the anode cavity of the stack is continuously consumed, and the internal pressure tends to decrease, so that the pressure of the gas at the anode side needs to be controlled in real time to be in a reasonable interval.
At present, the anode side gas pressure is generally controlled in real time by adopting an electric control method, namely, an anode pressure sensor is arranged on the anode side, the anode pressure sensor monitors the pressure value of the anode side of the fuel cell stack in real time and feeds the pressure value back to a control system in real time, and the control system dynamically controls the anode side gas pressure of the fuel cell stack through PID regulation to ensure that the anode side gas pressure is in a reasonable range. However, when the control system is in a fault state or is manually controlled, the anode cavity of the fuel cell stack occasionally exceeds the working pressure and even exceeds the tolerance capability of the components of the fuel cell system, and the components of the fuel cell system are damaged, so that the fuel cell system fails.
Disclosure of Invention
The utility model discloses the technical problem that will solve is: the overvoltage protection device and the fuel cell system are provided for solving the technical problem that a membrane electrode of a fuel cell stack is easily damaged when the pressure difference in the existing fuel cell stack is too large.
In order to solve the technical problem, the embodiment of the utility model provides an overvoltage protection device, which comprises a housin, be equipped with positive pole air inlet, negative pole air inlet and exhaust duct on the casing, the inside cavity of casing be separated for with the first cavity of negative pole air inlet intercommunication and with the second cavity of positive pole air inlet intercommunication, first cavity with the second cavity is mutual isolation, inside first elastic component and the reciprocating motion mechanism that is used for controlling the difference in air pressure between inside positive pole of fuel cell pile and the negative pole of being provided with of first cavity, first elastic component is kept away from negative pole air inlet's one end with reciprocating motion mechanism links to each other, reciprocating motion mechanism's the other end and setting are being close to the relief valve of positive pole air inlet department links to each other.
Optionally, the reciprocating mechanism comprises a piston body and a guide assembly, wherein a cavity inside the piston body forms a piston cavity, and the guide assembly is arranged in the piston cavity in a reciprocating manner; and a second elastic part for preventing the gas pressure at the anode side of the fuel cell stack from being overhigh is arranged between the piston body and the guide assembly.
Optionally, a sealing element is included in the housing for forming a radial seal between the piston body and the housing, and the sealing element is sleeved on the piston body.
Optionally, the second elastic member has a greater elastic coefficient than the first elastic member.
Optionally, the first elastic member and the second elastic member are both springs.
Optionally, the pressure relief valve includes a valve core and a valve seat, the valve core is connected to the reciprocating mechanism, and the valve core can be driven by the reciprocating mechanism to move axially along the first elastic member or the second elastic member, so as to be separated from or pressed against the valve seat, so as to open or close the pressure relief valve.
Optionally, the guide assembly comprises a movable member and a guide rod; the second elastic element is supported in the piston cavity through the movable element, and the guide rod is fixedly connected between the movable element and the valve core; the movable member is reciprocally disposed within the piston chamber.
The embodiment of the utility model provides an overvoltage protector, through inside first elastic component and the reciprocating motion mechanism of being provided with at first cavity, so that first elastic component compresses when negative and positive two pole pressure differential surpasses first elastic component compressive force in first overvoltage protection state fuel cell pile promptly, drive reciprocating motion mechanism along first elastic component axial to the motion of negative pole inlet pipe mouth direction, open the relief valve, make the gaseous exhaust from the exhaust pipe mouth of pipe of the positive pole that flows into in the second cavity through the relief valve, the realization carries out the purpose of pressure release to anode side gas pressure, in order to satisfy the required gas quantity of fuel cell pile reaction when according to the change of the inside pressure differential of fuel cell pile, the balance of the inside pressure differential of real-time control fuel cell pile, thereby effectively protect the fuel cell pile, prolong the life of fuel cell pile. In addition, the embodiment of the utility model provides an overvoltage protector's component is small in quantity, simple structure and with low costs.
The embodiment of the utility model provides a still provide a fuel cell system, including galvanic pile negative pole cavity, galvanic pile positive pole cavity, and overvoltage protector, galvanic pile negative pole cavity with negative pole air inlet pipe mouth among the overvoltage protector links to each other, galvanic pile positive pole cavity with positive pole air inlet pipe mouth among the overvoltage protector links to each other.
The embodiment of the utility model provides a fuel cell system, on the basis of satisfying the required gas quantity of the interior battery electricity of system and pushing away the reaction, can effectively guarantee that the pressure differential is in balanced state in the fuel cell pile, guarantees the life of membrane electrode to guarantee fuel cell system's stability. Meanwhile, the pressure of the gas at the anode side can be controlled within a certain range, so that the internal parts of the fuel cell system can be effectively protected, the gas leakage can be prevented, and the safety of the fuel cell system is ensured.
Drawings
Fig. 1 is a schematic view of a specific structure of the overvoltage protection device;
the reference numerals in the specification are as follows:
1. a housing; 11. an anode gas inlet pipe orifice; 12. a cathode gas inlet pipe orifice; 13. an exhaust pipe orifice; 2. a first elastic member; 31. a valve seat; 32. a valve core; 4. a second elastic member; 51. a piston body; 52. a piston cavity; 531. A movable member; 532. a guide bar; 6. and a seal.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, an overvoltage protection device provided in an embodiment of the present invention includes a housing 1, and an anode air inlet pipe 11, a cathode air inlet pipe 12, and an exhaust pipe 13 disposed on the housing 1, wherein a cavity inside the housing 1 is divided into a first cavity communicated with the cathode air inlet pipe 12 and a second cavity communicated with the anode air inlet pipe 11, a first elastic member 2 and a reciprocating mechanism are disposed inside the first cavity, one end of the first elastic member 2 away from the cathode air inlet pipe 12 is connected to the reciprocating mechanism, and the other end of the reciprocating mechanism is connected to a pressure relief valve disposed near the anode air inlet pipe 11; the first elastic part 2 is compressed under a first overvoltage protection state, drives the reciprocating mechanism to move along the axial direction of the first elastic part 2 to the direction of the cathode air inlet pipe orifice 12, and opens the pressure release valve, so that the anode gas flowing into the second cavity through the pressure release valve is discharged from the exhaust pipe orifice 13.
The overvoltage protection device can be applied to a fuel cell system to ensure that when the fuel cell system works, the problem that the membrane electrode of the fuel cell stack is damaged due to overlarge pressure difference inside the fuel cell stack by controlling the balance of the pressure difference between the anode and the cathode in the fuel cell stack is solved. Wherein, through separating first cavity and second cavity, form two seal chamber to the realization makes first elastic component 2 compress or reset according to the change of negative and positive two poles of the earth pressure differential, thereby the purpose of the open mode of real-time control relief valve.
In order to make the reaction of the fuel cell stack smoothly proceed, the cathode and the anode of the fuel cell system need to be introduced with reaction gases, i.e. hydrogen and air, according to a certain pressure and flow rate, and the hydrogen and the air introduced into the system realize the reverse reaction of the electrolyzed water through a certain catalytic action, so as to release electric energy, water and heat. The anode inlet pipe orifice 11 is an orifice for receiving hydrogen gas introduced into an anode cavity of the stack, the cathode inlet pipe orifice 12 is an orifice for receiving air introduced into a cathode cavity of the stack, and the exhaust pipe orifice 13 is an orifice for discharging anode gas flowing into a second cavity under an overpressure protection state.
It can be understood that when the pressure difference between the anode and the cathode in the fuel cell stack is too large, the membrane electrode is easily damaged, so that the anode gas needs to be discharged through the exhaust pipe opening 13 to reduce the pressure of the anode gas, so that the pressure difference between the anode and the cathode in the fuel cell stack is kept balanced, thereby effectively protecting the fuel cell stack and prolonging the service life of the fuel cell stack. The reciprocating mechanism can reciprocate along the axial direction of the first elastic part 2 under the driving of the first elastic part 2, and the pressure release valve can be opened or closed according to the state of the gas pressure of the anode side.
Wherein, when in the first overvoltage protection state, the difference between the anode side gas pressure and the cathode side gas pressure is larger than the compression force of the first elastic element 2. Assuming that the gas pressure at the cathode side is P1, the gas pressure at the anode side is P2, and the compression force of the first elastic member 2 is F1, when P2-P1 is greater than F1, the gas pressure at the anode side is too high, the sum of the compression force F1 of the first elastic member 2 and the gas pressure P1 at the cathode side is not enough to balance the gas pressure P2 at the anode side, the first elastic member 2 is compressed, and drives the reciprocating mechanism to move along the axial direction of the first elastic member 2 toward the cathode gas inlet pipe orifice 12, so that the pressure relief valve is opened, and the anode gas flowing into the second cavity through the pressure relief valve is discharged from the exhaust pipe orifice 13, thereby achieving the purpose of relieving the gas at the anode side, keeping the pressure difference between the anode and the cathode in a balanced state, effectively protecting the fuel cell stack, and prolonging the service.
Further, when P2-P1 is not less than F1, the anode air inlet pipe is in a balanced state, the first elastic piece 2 resets and drives the reciprocating mechanism to move towards the direction of the anode air inlet pipe orifice 11 along the axial direction of the first elastic piece 2, so that the pressure release valve is closed under the driving of the reciprocating mechanism, the on-off state of the pressure release valve is controlled in real time according to the change of the pressure difference between the anode and the cathode in the fuel cell stack, and the purpose of controlling the pressure in real time is achieved.
The embodiment of the utility model provides an overvoltage protector, through inside first elastic component 2 and the reciprocating motion mechanism of setting up of first cavity, so that first elastic component 2 compresses under first overvoltage protection state (when negative and positive polar pressure difference is too big in the fuel cell pile promptly), drive reciprocating motion mechanism along 2 axial movements to negative pole inlet pipe mouth 12 directions of first elastic component, open the relief valve, make the gaseous discharge from exhaust pipe mouth 13 of following of positive pole that flows into the second cavity through the relief valve, realize carrying out the purpose of pressure release to anode side gas, with the change according to negative and positive polar pressure difference, the balance of negative and positive polar pressure difference in the real time control fuel cell pile, thereby guarantee the security and the stability of fuel cell pile. In addition, the embodiment of the utility model provides an overvoltage protector's component is small in quantity, simple structure and with low costs.
In one embodiment, as shown in fig. 1, the reciprocating mechanism comprises a piston body 51 and a guide assembly, wherein a piston cavity 52 is arranged inside the piston body 51, and the guide assembly is arranged in the piston cavity 52 in a reciprocating manner; a second elastic piece 4 is arranged between the piston body 51 and the guide assembly; the second elastic part 4 is compressed under the second overvoltage protection state, drives the guide assembly to move towards the cathode air inlet pipe orifice 12 along the axial direction of the second elastic part 4, and opens the pressure release valve, so that the anode gas flowing into the second cavity through the pressure release valve is discharged from the exhaust pipe orifice 13.
In this embodiment, through controlling the second elastic component 4 to compress under the second overvoltage protection state, the guide assembly is driven to move towards the cathode gas inlet pipe orifice 12 along the axial direction of the second elastic component 4, the pressure release valve is opened, so that the anode gas flowing into the second cavity through the pressure release valve is discharged from the exhaust pipe orifice 13, the pressure of the anode side gas pressure can be effectively prevented from further rising, and the problem that the system components are damaged due to the fact that the anode side gas pressure has an emergency when the control system is in a fault state when the control method is adopted for pressure control is avoided.
In addition, because the anode gas is hydrogen which belongs to flammable and explosive gas, once the anode gas leaks, safety problems are easily caused, the leakage of the anode gas (namely, the hydrogen) can be effectively prevented by controlling the pressure of the anode side gas, and the safety of a fuel system is improved.
And when the pressure of the anode side gas is greater than the compression force of the second elastic element 4, the fuel cell stack is in a second overvoltage protection state. It can be understood that, assuming that the cathode-side gas pressure is P1, the anode-side gas pressure is P2, the compression force of the first elastic member 2 is F1, the compression force of the second elastic member 4 is F2, when P2-P1 < F1, the pressure difference between the anode and the cathode inside the fuel cell stack is in a balanced state, the reciprocating mechanism does not move axially along the spring, hydrogen and air continue to be introduced as the reaction in the fuel cell stack proceeds, the cathode-side gas pressure and the anode-side gas pressure increase continuously, when the anode-side gas pressure is greater than the compression force of the second elastic member 4 (i.e. P2 > F2), the second over-pressure protection state is present, the second elastic member 4 compresses to drive the pressure release valve to move axially along the second elastic member 4 toward the cathode gas inlet 12, and open, so that the anode gas flowing into the second chamber through the pressure release valve is discharged from the exhaust port 13, the gas pressure of the anode side is timely reduced, so that the gas pressure of the anode side is in the compression force of the second elastic piece 4, the problem that the gas pressure of the anode side exceeds the tolerance capacity of a component and the system component is easily damaged is effectively solved, and in addition, the gas leakage of the anode side can be prevented, and the safety is improved.
Further, after the pressure of the gas on the anode side is released, when the pressure P2 is not less than F2, the gas is in a balanced state, the second elastic part 4 resets, the guide assembly is driven to move towards the anode gas inlet pipe orifice 11 along the axial direction of the second elastic part 4, the pressure release valve is closed under the driving of the guide assembly, and therefore the on-off state of the pressure release valve is controlled in real time according to the change of the pressure of the gas on the anode side, and the purpose of controlling the pressure in real time is achieved.
The compression force of the first elastic member 2 and the compression force of the second elastic member 4 may be adjusted according to actual needs, and are not limited herein. It can be understood that, through adjusting the compressive force of the first elastic element 2 and the compressive force of the second elastic element 4, different pressure control requirements can be met, so that the overvoltage protection device provided by the embodiment has strong versatility, and is applicable to different pressure control scenes.
It can be understood that the compression force of the first elastic element 2 and the compression force of the second elastic element in this embodiment can be regarded as two opening thresholds for opening the relief valve, so as to achieve the purpose of two-stage relief.
The overvoltage protection device provided by the embodiment is opened in a first overvoltage protection state or a second overvoltage protection state by adopting the mechanical control type pressure release valve to achieve the purpose of secondary pressure release, so that the pressure difference between the anode and the cathode can be effectively controlled to be in a balanced state, the pressure of gas on the anode side can be prevented from rising, the tolerance capacity of a fuel cell system component is exceeded, and the problem of the system component is damaged, so that the safety and the stability of the fuel cell system are effectively guaranteed. In addition, the problem that system components are damaged due to the fact that the pressure of gas on the anode side is in an emergency when a control system is in a fault state when the pressure is controlled by an electric control method can be effectively solved.
In one embodiment, as shown in fig. 1, the housing 1 includes a sealing member 6 therein, and the sealing member 6 is disposed on the piston body 51 for forming a radial seal between the piston body 51 and the inner wall of the housing 1. Radial sealing is formed between the piston body 51 and the shell 1, so that the first cavity and the second cavity are isolated from each other, and the problem that the internal pressure difference of the fuel cell stack cannot be controlled according to the pressure balance principle due to the communication of the two cavities is solved.
In one embodiment, the elastic coefficient of the second elastic member 4 is greater than the elastic coefficient of the first elastic member 2. It can be understood that the elastic coefficient of the second elastic member 4 needs to be larger than that of the first elastic member 2, so that the anode side gas can be released by opening the pressure release valve through the compression of the first elastic member 2 in the first overvoltage protection state, that is, when the pressure difference between the anode and the cathode in the fuel cell stack is larger than the compression force of the first elastic member 2, thereby achieving the purpose of one-time pressure release. Meanwhile, under the second overvoltage protection state, namely, the pressure difference between the anode and the cathode in the fuel cell stack is in a balanced state, and when the pressure of the gas at the anode is too large to exceed the compression force of the second elastic part 4, the pressure release valve can be opened through the compression of the second elastic part 4 to release the gas at the anode, so that the purpose of secondary pressure release is achieved, the pressure difference between the anode and the cathode in the fuel cell stack can be ensured to be in a balanced state, the pressure of the gas at the anode can be ensured to be within the compression force of the second elastic part 4, the situation that the gas at the anode is too high to damage components of the fuel cell system is prevented, and the safety and the.
In one embodiment, the first elastic member 2 and the second elastic member 4 are both springs. The first elastic piece 2 and the second elastic piece 4 adopt spiral springs, so that the weight is light, the occupied space is small, and the cost is low.
In one embodiment, the relief valve comprises a valve core 32 and a valve seat 31, wherein the valve core 32 is connected with the reciprocating mechanism; the reciprocating mechanism drives the valve core 32 to move axially along the first elastic part 2 or the second elastic part 4, and the valve core is separated from the valve seat 31 to open the pressure relief valve.
The valve seat 31 is a member for supporting the valve element 32 in the fully closed position and constituting a seal pair. The valve body performs basic functions such as direction control, pressure control, or flow control by the movement of the valve element 32.
In this embodiment, when the pressure difference between the anode and the cathode in the fuel cell stack is greater than the compressive force of the first elastic element 2, i.e. when the fuel cell stack is in the first overvoltage protection state, the first elastic element 2 is compressed and drives the reciprocating mechanism to move along the axial direction of the first elastic element 2 toward the cathode gas inlet pipe orifice 12, so as to drive the valve element 32 to move along the axial direction of the first elastic element 2 toward the cathode gas inlet pipe orifice 12 and separate from the valve seat 31, so as to open the pressure release valve to release the pressure of the gas at the anode.
When the gas pressure on the anode side is greater than the compression force of the second elastic element 4, that is, in the second overvoltage protection state, the second elastic element 4 compresses toward the cathode gas inlet pipe orifice 12 to drive the movable element 531 to move in the piston cavity 52, so that the valve element 32 is driven by the reciprocating mechanism to move toward the cathode gas inlet pipe orifice 12, and the valve element 32 is separated from the valve seat 31 to release the gas pressure on the anode side.
After the anode side gas is decompressed, the pressure of the anode side gas is reduced, the pressure difference between the anode and the cathode in the fuel cell stack is in a balanced state, the first elastic part 2 compresses towards the anode air inlet pipe orifice 11, the reciprocating mechanism is driven to move towards the anode air inlet pipe orifice 11, the valve core 32 is pressed onto the valve seat 31, and the balanced state is recovered.
Or, when the pressure difference between the anode and the cathode in the fuel cell stack is in a balanced state and the gas pressure on the anode side does not exceed the compressive force of the second elastic part 4, the second elastic part 4 compresses towards the anode gas inlet pipe orifice 11 to drive the reciprocating mechanism to move towards the anode gas inlet pipe orifice 11, so that the valve core 32 is pressed onto the valve seat 31 to restore the balanced state.
In one embodiment, as shown in FIG. 1, the guide assembly includes a moveable member 531 and a guide bar 532; the second elastic element 4 is supported in the piston body 51 through the movable element 531, and the guide bar 532 is fixedly connected between the movable element 531 and the valve core 32; movable member 531 is reciprocatingly disposed within piston chamber 52.
In this embodiment, when the anode-side gas pressure is in the second overvoltage protection state, that is, the anode-side gas pressure is greater than the compression force of the second elastic element 4, the second elastic element 4 compresses toward the cathode gas inlet pipe orifice 12 to drive the movable element 531 to move in the piston cavity 52, so that the guide rod 532 drives the valve element 32 to move toward the cathode gas inlet pipe orifice 12, the valve element 32 is separated from the valve seat 31, the anode gas flows into the second cavity and is exhausted through the exhaust pipe orifice 13 disposed in the second cavity, thereby preventing the anode-side gas pressure from further rising and damaging the components of the fuel cell system. In addition, the problem of potential safety hazard caused by gas exposure due to the increase of the gas pressure of the anode side can be effectively prevented, and the safety and the stability of the fuel cell system are effectively improved.
After the pressure of the gas at the anode side is relieved, the gas pressure at the anode side is reduced, when the gas pressure at the anode side is smaller than the compression force of the second elastic element 4, the second elastic element 4 compresses towards the direction of the anode gas inlet pipe orifice 11, the movable element 531 is driven to move in the piston cavity 52, so that the valve core 32 is driven to move towards the direction of the anode gas inlet pipe orifice 11 through the guide rod 532, the valve core 32 is pressed onto the valve seat 31, the balance state is restored, the change of the gas pressure at the anode side is real-timely determined, the on-off state of the pressure relief valve is controlled based on the pressure balance principle, and the purpose of real-.
In an embodiment, the first elastic member 2 and the second elastic member 4 press the valve element 32 against the valve seat 31 in the non-overpressure protection state, so that the relief valve is in the closed state.
The non-overvoltage protection state refers to a state other than the first overvoltage protection state and the second overvoltage protection state, and it is understood that the non-overvoltage protection state may include a state where a difference in voltage between anode and cathode in the fuel cell stack is not greater than a compressive force of the first elastic member 2, and a state where a difference in voltage between anode and cathode in the fuel cell stack is not greater than a compressive force of the first elastic member 2 and a pressure of gas at the anode side is not greater than a compressive force of the second elastic member 4.
Specifically, under the non-overpressure protection state, the valve core 32 is pressed onto the valve seat 31 through the pretightening force of the first elastic piece 2 and the second elastic piece 4, so that the pressure release valve is in a closed state to form a sealing surface, thereby maintaining the balance of the internal pressure difference of the fuel cell stack and being not influenced by the external environment.
The embodiment of the utility model provides a still provide a fuel cell system, including the overvoltage protection device of pile negative pole cavity, pile positive pole cavity and above-mentioned embodiment, the negative pole air inlet pipe mouth 12 among pile negative pole cavity and the overvoltage protection device links to each other, and the positive pole air inlet pipe mouth 11 among pile positive pole cavity and the overvoltage protection device links to each other.
The fuel cell system comprises an anode gas supply subsystem and a cathode gas supply subsystem, wherein the anode gas supply subsystem is used for introducing hydrogen into an anode cavity of a pile in the system. The cathode gas supply subsystem is used for introducing air into a cathode cavity of the electric pile in the system.
Specifically, a cathode cavity of the stack is connected with a cathode air inlet pipe orifice 12 in the overvoltage protection device, and an anode cavity of the stack is connected with an anode air inlet pipe orifice 11 in the overvoltage protection device, so that the stack is opened in a first overvoltage protection state or a second overvoltage protection state through a mechanical control type pressure release valve inside the fuel cell system, the purpose of secondary pressure release is achieved, the pressure difference in the stack of the fuel cell can be effectively controlled to be in a balance state, the gas pressure of the anode side can be controlled to be within the compression force of the second elastic part 4, and the safety and the stability of the fuel cell system are effectively guaranteed.
The embodiment of the utility model provides a fuel cell system on the basis of satisfying the required gas quantity of system's interior battery pile reaction, can effectively guarantee that pressure differential is in balanced state in the fuel cell pile, guarantees the life of membrane electrode to guarantee fuel cell system's stability. Meanwhile, the pressure of the gas at the anode side can be controlled within the compression force of the second elastic element 4, so as to effectively protect the components in the fuel cell system, prevent the gas leakage and ensure the safety of the fuel cell system.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The utility model provides an overvoltage protector, its characterized in that, includes the casing, be equipped with positive pole air inlet pipe mouth, negative pole air inlet pipe mouth and exhaust pipe mouth on the casing, the inside cavity of casing be separated for with the first cavity of negative pole air inlet pipe mouth intercommunication and with the second cavity of positive pole air inlet pipe mouth intercommunication, first cavity with the second cavity is mutual isolation, inside first elastic component and the reciprocating motion mechanism that is used for controlling the difference in air pressure between the inside positive pole of fuel cell pile and the negative pole of being provided with of first cavity, first elastic component is kept away from negative pole air inlet pipe mouth's one end with reciprocating motion mechanism links to each other, reciprocating motion mechanism's the other end with set up and be close to the relief valve of positive pole air inlet pipe mouth department links to each other.
2. The overvoltage protection device of claim 1, wherein the reciprocating mechanism includes a piston body and a guide assembly, a cavity in the piston body forming a piston chamber, the guide assembly reciprocally disposed in the piston chamber; and a second elastic part for preventing the gas pressure at the anode side of the fuel cell stack from being overhigh is arranged between the piston body and the guide assembly.
3. The overvoltage protection device of claim 2, wherein said housing includes a sealing member for forming a radial seal between said piston body and said housing, said sealing member being disposed about said piston body.
4. The overvoltage protection device of claim 2, wherein the second resilient member has a spring rate greater than a spring rate of the first resilient member.
5. The overvoltage protection device of claim 2, wherein the first and second resilient members are each a spring.
6. The overvoltage protection device of claim 2, wherein the pressure relief valve comprises a valve core and a valve seat, the valve core is connected to the reciprocating mechanism, and the valve core can be driven by the reciprocating mechanism to move axially along the first elastic member or the second elastic member so as to be separated from or pressed against the valve seat to open or close the pressure relief valve.
7. The overvoltage protection device of claim 6, wherein the guide assembly includes a movable member and a guide rod; the second elastic element is supported in the piston cavity through the movable element, and the guide rod is fixedly connected between the movable element and the valve core; the movable member is reciprocally disposed within the piston chamber.
8. A fuel cell system comprising a stack cathode chamber, a stack anode chamber, and the overvoltage protection device of any one of claims 1 to 7, wherein the stack cathode chamber is connected to a cathode inlet port of the overvoltage protection device, and the stack anode chamber is connected to an anode inlet port of the overvoltage protection device.
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| CN202020368886.6U CN211929631U (en) | 2020-03-19 | 2020-03-19 | Overvoltage protection device and fuel cell system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113745603A (en) * | 2021-08-10 | 2021-12-03 | 嘉庚创新实验室 | Pressure regulation explosion-proof device, battery thereof and explosion-proof method of battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113745603A (en) * | 2021-08-10 | 2021-12-03 | 嘉庚创新实验室 | Pressure regulation explosion-proof device, battery thereof and explosion-proof method of battery |
| CN113745603B (en) * | 2021-08-10 | 2023-06-09 | 嘉庚创新实验室 | Pressure-adjusting explosion-proof device and battery thereof and explosion-proof method of battery |
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