CN217114452U - External cooling type liquid cooling fuel cell bipolar plate, shared bipolar plate, galvanic pile and parallel galvanic pile - Google Patents
External cooling type liquid cooling fuel cell bipolar plate, shared bipolar plate, galvanic pile and parallel galvanic pile Download PDFInfo
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- CN217114452U CN217114452U CN202123366094.9U CN202123366094U CN217114452U CN 217114452 U CN217114452 U CN 217114452U CN 202123366094 U CN202123366094 U CN 202123366094U CN 217114452 U CN217114452 U CN 217114452U
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- 238000001816 cooling Methods 0.000 title claims abstract description 117
- 239000000446 fuel Substances 0.000 title claims abstract description 83
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 19
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- 229910002804 graphite Inorganic materials 0.000 claims description 24
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 20
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- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
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Abstract
The utility model relates to an external cooling type liquid cooling fuel cell bipolar plate, sharing type bipolar plate, pile and parallelly connected pile, bipolar plate comprises the monolithic polar plate, and this polar plate middle zone and membrane electrode contact, conduction electron, the both sides fin that this polar plate extends formation are heat dissipation region. The cooling fins are surrounded to form an outer cooling cavity of the galvanic pile, cooling medium flows through the outer cooling cavity to carry out heat generated inside the galvanic pile, and finally the cooling medium is dissipated to the surrounding environment through the cooling fins. The utility model eliminates the contact resistance generated by two polar plates as the bipolar plate and the corrosion at the welding seam of the metal bipolar plate, improves the battery performance and the service life of the bipolar plate, and further improves the service life of the battery; the thickness of the bipolar plate is reduced, and the volume specific power is improved; the energy consumed by the large resistance of the cooling medium flowing through the cooling cavity in the middle of the bipolar plate is reduced; the extrusion change of the cooling liquid to the membrane electrode caused by expansion with heat and contraction with cold in the cooling cavity of the bipolar plate made of two polar plates is eliminated, and the stability of the membrane electrode is improved.
Description
Technical Field
The utility model relates to a be used for fuel cell technical field, concretely relates to fuel cell bipolar plate suitable for liquid cooling technique.
Background
The traditional proton exchange membrane fuel cell stack consists of an end plate, an insulating plate, a current collecting plate, a repeating unit formed by alternately stacking a plurality of bipolar plates and a membrane electrode, the current collecting plate on the other side, the insulating plate and the end plate. The bipolar plate is one of the important components of the proton exchange membrane fuel cell, and plays important roles in separating an oxidant and a reducing agent, distributing reactants and products, generating heat and collecting conduction current.
In the liquid cooling fuel cell, the bipolar plate mainly includes graphite bipolar plate, metal bipolar plate and composite bipolar plate, and generally adopts welding or bonding method to compound two layers of polar plates (anode plate and cathode plate) together, and the middle portion forms cooling cavity. Water or other coolants are generally adopted as heat-conducting carriers and flow through a cooling cavity in the middle of the bipolar plate, so that heat generated in the working process of the fuel cell is brought out through circulation and then is transferred to the ambient environment through a radiator or is used as a high-quality heat source for combined heat and power.
The contact surface of the thin metal punched bipolar plate and the membrane electrode needs to be subjected to anti-corrosion treatment for improving the conductivity, the inner surface of the middle cooling cavity is not treated generally, the contact resistance of the middle cooling cavity is large, the internal resistance is further increased after the battery runs for a long time, and the welding seam part is easy to corrode and leak air. When the graphite bipolar plate is adopted, the strength of the substrate and the reasonable smoothness of the intermediate cooling channel are ensured, and the anode plate and the cathode plate which are carved or molded are ensured to have certain strength and thickness, so that the composite bipolar plate has thicker and heavier thickness. The composite bipolar plates have some factors which limit the application environment and improve the performance, for example, the graphite bipolar plates have poor shock resistance, cannot be made thinner, the assembly force is difficult to control, and the cost is high; the anode graphite flow field and the cathode graphite flow field are adhered to the surface of the thin metal plate which is subjected to the anti-corrosion treatment for improving the conductivity, the middle cooling liquid flow field is adhered after prefabrication, the periphery of the middle cooling liquid flow field is pressed and sealed by colloid, the structure is complex, the battery runs for a long time, the solution in a cooling cavity is corroded, the internal resistance is increased, the performance of the battery is reduced, the colloid cracks to cause gas leakage and air leakage, and the battery fails. Although the graphite bipolar plate and the composite bipolar plate have great improvement in mechanical strength, the graphite bipolar plate and the composite bipolar plate are relatively complex to machine and assemble due to more adopted materials and parts, the mass specific power and the volume specific power of the graphite bipolar plate are difficult to further improve, and the cost is difficult to further reduce. In contrast, the metal bipolar plate can be processed to be very light and thin, the mass specific power and the volume specific power are greatly improved, and meanwhile, the requirements of excellent conductivity, good heat transfer performance, high mechanical strength and the like can be met. And the polar plate is processed by stamping, so that the method is suitable for large-scale production and can strictly control the cost.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a liquid cold type fuel cell uses middle bipolar plate for cooling chamber to in-service use, contact resistance is big between the two-layer polar plate that exists, the welding seam is easy to be corroded the fracture, and bipolar plate structure is complicated, preparation cost is high, thickness increases the big scheduling problem of resistance, the utility model discloses use the individual layer polar plate to prepare out bipolar plate, possess bipolar plate's all functions, consequently make and subsequent assembly process all simple relatively, be suitable for very much large-scale processing manufacturing reduce cost simultaneously to obtain practical application. The utility model discloses quality specific power and volume specific power that improve the pile body have further been improved.
The utility model discloses a concrete technical scheme as follows:
on the one hand, the utility model provides an external cooling type liquid cooling fuel cell bipolar plate, bipolar plate constitute by having flow field monolithic polar plate, and the monolithic polar plate includes the cooling fin of reaction zone and reaction zone both sides, and reaction zone includes the flow field, two width direction in flow field are equipped with fuel import and export and the oxidant is imported and exported. The middle reaction area of the polar plate is contacted with the membrane electrode and conducts electrons, and the fins on two sides of the polar plate are heat dissipation areas.
On the other hand, the utility model also provides an external cooling type liquid cooling fuel cell shared bipolar plate, the shared bipolar plate comprises a single polar plate, the single polar plate comprises a middle area and cooling fins at two sides of the middle area, the middle area comprises at least two reaction areas, and the cooling fins are arranged between the two adjacent reaction areas; any one of the reaction areas comprises a flow field, and a fuel inlet and a fuel outlet and an oxidant inlet and a fuel outlet are arranged in the two width directions of any one of the flow fields.
Based on the above technical solution, preferably, the fuel inlet and the fuel outlet are located in a diagonal direction of the flow field, and the oxidant inlet and the oxidant outlet are located in another diagonal direction of the flow field.
Based on the technical scheme, preferably, the flow field, the peripheries of the fuel inlet and the fuel outlet and the peripheries of the oxidant inlet and the oxidant outlet are sealed by using sealing glue or sealing glue lines.
Based on the technical scheme, preferably, the cooling fins are provided with reinforcing ribs.
Based on the above technical scheme, preferably, the bipolar plate may be a metal stamping plate, or may also be a graphite engraving plate, a graphite molding plate, or a metal plate-graphite flow field composite bipolar plate.
Based on the technical scheme, preferably, the flow field of the thin metal stamping plate, the public pipeline inlet and outlet (fuel inlet and outlet and oxidant inlet and outlet), the positioning hole, the electric pile fastening bolt perforation and the reinforcing rib of the cooling fin are manufactured by stamping, the flow fields of the two adjacent bipolar plates form a mirror image structure, the thin metal plate can be one of stainless steel, aluminum plate, titanium and titanium alloy, the flow field part is subjected to conductivity improving anti-corrosion treatment, and the cooling part is subjected to insulating anti-corrosion treatment.
Based on the technical scheme, preferably, the flow field of the graphite engraving plate, the public pipeline inlet and outlet (a fuel inlet and outlet and an oxidant inlet and outlet), the positioning hole, the electric pile fastening bolt perforation and the reinforcing rib (or not) of the cooling part are machined, and the flow fields of two adjacent bipolar plates form a mirror image structure.
Based on the technical scheme, preferably, the flow field of the graphite mold pressing plate, the inlet and outlet (fuel inlet and outlet and oxidant inlet and outlet) of the public pipeline, the positioning hole, the punch hole of the electric pile fastening bolt and the reinforcing rib of the cooling part are manufactured by mold pressing, and the flow fields of two adjacent bipolar plates form a mirror image structure.
Based on the technical scheme, preferably, the metal plate-graphite flow field composite bipolar plate is prepared by punching or wire-cutting a thin metal plate through an inlet and an outlet (a fuel inlet and an outlet and an oxidant inlet and an outlet) of a common pipeline, a positioning hole, a galvanic pile fastening bolt perforation and a reinforcing rib of a cooling fin; the graphite flow field is prepared by molding flexible graphite; the flow field part of the metal plate is subjected to conductivity improving anti-corrosion treatment, and the cooling part is subjected to insulating anti-corrosion treatment.
In another aspect, the present invention provides a galvanic pile including the non-shared bipolar plate, wherein the galvanic pile includes an end plate, an insulating plate, a current collecting plate, a repeating unit formed by alternately stacking a plurality of bipolar plates and a membrane electrode, a current collecting plate on the other side, an insulating plate, and an end plate; the cooling fins of the bipolar plate partially exceed the galvanic pile body, the cooling fins are surrounded to form an outer cooling cavity of the galvanic pile, cooling medium flows through the outer cooling cavity to carry out heat generated inside the galvanic pile, and finally the cooling medium is dissipated to the surrounding environment through a system external cooling fin or is used as a high-quality heat source for utilization.
The utility model also provides a fuel cell parallel galvanic pile comprising the above-mentioned shared bipolar plate, the shared bipolar plate is assembled into a plurality of parallel galvanic pile structures, the galvanic piles are connected by the cooling fin part between the reaction areas in the shared bipolar plate, the cooling fins on both sides of the shared bipolar plate in the galvanic pile are surrounded, and the cooling fins between the reaction areas are surrounded, and the cooling cavities of the galvanic pile are formed together; if the bipolar plates are not shared, a plurality of stacks can be connected in series or in parallel.
Advantageous effects
1. The utility model eliminates the contact resistance generated by two polar plates as the bipolar plate and the corrosion at the welding seam of the metal bipolar plate, improves the battery performance and the service life of the bipolar plate, and further improves the service life of the battery;
2. the utility model uses single polar plate as bipolar plate, which reduces the thickness of bipolar plate and improves the volume ratio power;
3. because of being limited by the heat conductivity coefficient of the bipolar plate material, the flow field of each section of membrane electrode and the bipolar plate is not too wide, so that a larger current is obtained, and the galvanic pile is required to be designed into a parallel galvanic pile structure formed by assembling the shared bipolar plates, so that the utility model has flexible and changeable assembly forms and design schemes according to the requirements of users;
4. the utility model reduces the energy consumed by the large resistance of the cooling medium flowing through the cooling cavity in the middle of the bipolar plate;
5. the utility model eliminates the extrusion change to the membrane electrode caused by the expansion with heat and contraction with cold of the cooling liquid in the cooling cavity of the bipolar plate made of two polar plates, improves the stability of the membrane electrode and prolongs the service life of the battery;
6. will the utility model discloses an outer cooling chamber of galvanic pile can directly be used as system's coolant liquid case (being equivalent to the water tank of car), has improved the wholeness of system.
Drawings
FIG. 1 is a schematic view of an externally cooled liquid-cooled fuel cell bipolar plate;
FIG. 2 is a schematic diagram of an externally cooled liquid-cooled fuel cell stack;
FIG. 3 is a schematic diagram of an externally cooled liquid-cooled fuel cell stack;
FIG. 4 is a diagram of the performance of an external cooling type liquid cooled fuel cell;
FIG. 5 is a schematic view of a common bipolar plate of an external cooling type liquid-cooled fuel cell;
FIG. 6 is a schematic diagram of an externally cooled liquid-cooled fuel cell shared bipolar plate stack;
FIG. 7 is a schematic diagram of an externally cooled liquid-cooled fuel cell parallel stack;
FIG. 8 is a diagram of the performance of an externally cooled liquid cooled fuel cell parallel stack;
schematic illustration: 1. a bipolar plate reaction zone; 2. cooling fins of the bipolar plate; 3. a bipolar plate flow field; 4. fuel (hydrogen) inlet and outlet; 5. an oxidant (air) inlet and outlet; 6. a seal line; 7. a bolt through hole for fixing; 8. reinforcing ribs; 9. end plates and a stack shell; 10. an insulating plate; 11. a collector plate; 12. a bipolar plate; 13. a seal ring; 14. a membrane electrode; 15. a coolant inlet; 16. and a cooling liquid outlet.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Example 1
According to the figure 1, a piece of 316 stainless steel with the substrate thickness of 0.1mm is punched to obtain a bipolar plate shape, the middle area of the bipolar plate in the figure is a reaction area 1, the upper side and the lower side of the bipolar plate are cooling fins 2, the center part of the reaction area is a flow field 3, the flow fields 3 of two bipolar plates on two sides of the same membrane electrode are mirror symmetry to prevent the membrane electrode from being cut, a fuel (hydrogen) inlet and outlet 4 and an oxidant (air or oxygen) inlet and outlet 5 obtained by punching are respectively arranged in a diagonal line, sealing rings 6 are arranged on the corresponding positions of the front surface and the back surface of the bipolar plate to seal the membrane electrode to prevent air leakage and air blow-by, a punched bolt through hole 7 for fixing the stack is sleeved with an insulating thermoplastic tube and the like when the stack is fixed by a bolt, so as to prevent short circuit. The reinforcing ribs 8 are obtained by stamping to ensure that the cooling fins of the bipolar plate have certain strength, keep a flat state and avoid short circuit with other bipolar plates. The flow field part is subjected to conductivity improving anti-corrosion treatment, and the cooling part is subjected to insulating anti-corrosion treatment.
The galvanic pile is composed of an end plate 9, an insulating plate 10, a current collecting plate 11, a repeating unit formed by a plurality of bipolar plates 12 and a membrane electrode 14 which are alternately stacked, two sides of the membrane electrode are sealed by a sealing ring 13, and the current collecting plate, the insulating plate and the end plate on the other side are formed; the cooling fin part 2 of the bipolar plate extends out of the electric pile body area 1, and the cooling fin 2 is surrounded to form an outer cooling cavity of the electric pile and an end plate to form a whole 9. As shown in fig. 3, the cooling medium enters the inside of the stack module through the cooling cavity inlet 15, flows in the direction of the arrow, carries away the heat generated by the battery, carries the battery heat out through the cooling cavity outlet 16, and finally is dissipated to the surrounding environment through the system external heat sink or used as a high-quality heat source.
According to the utility model discloses the technique is stamped into bipolar plate with single corrosion resistant plate, and the partial silvering in flow field improves electric conduction corrosion resistance, and the compound modified fluorocarbon resin of cooling part hot spraying is made insulating anticorrosion and is handled. The electric pile of the 60-section external cooling type liquid cooling fuel cell is assembled, and the effective area of the electrode is 100cm 2 . Hydrogen is used as fuel, air is used as oxidant, the operating pressure of hydrogen is 0.5bar, the air pressure is 0.35bar, and the stoichiometric ratio of air is 2; the cooling medium is deionized water, the inlet temperature is 50, the outlet temperature is 58, the performance of the battery is shown in figure 4, and the maximum output can be 2.7 kW. Tests show that after the electric pile runs for 5000 hours, the battery performance is not obviously attenuated and still stably runs.
Example 2
According to the figure 5, a piece of 316 stainless steel with the base material thickness of 0.1mm is punched to obtain the bipolar plate shape with a fuel (hydrogen) inlet and outlet 4 and an oxidant (air or oxygen) inlet and outlet 5 which are arranged diagonally, screw through holes 7 and reinforcing ribs 8, wherein the middle area is provided with two reaction areas 1, and the upper side and the lower side and the middle of the two reaction areas are provided with cooling fins 2. The central part of the reaction area 1 is a flow field 3, the flow field 3 adopts a prefabricated flexible graphite flow field, and the flow fields 3 of two bipolar plates on two sides of the same membrane electrode are in mirror symmetry so as to prevent the membrane electrode from being cut. Sealing rings 6 are arranged on the corresponding positions of the front and back surfaces of the bipolar plate to seal the membrane electrode 14 around the gas inlet and outlet 4-5 and the flexible graphite flow field 3, so as to prevent gas leakage and gas blowby. The punched bolt through hole 7 for fixing the stack is fixed by a bolt, and the bolt is sleeved with an insulating thermoplastic pipe and the like to prevent short circuit. The reinforcing ribs 8 obtained by stamping are used for ensuring that the cooling fins of the bipolar plate have certain strength, keeping the flat state and avoiding short circuit with other bipolar plates.
The galvanic pile is composed of an end plate 9, an insulating plate 10, a current collecting plate 11, a repeating unit formed by a plurality of bipolar plates 12 and a membrane electrode 14 which are alternately stacked, two sides of the membrane electrode are sealed by a sealing ring 13, and the current collecting plate, the insulating plate and the end plate on the other side are formed; two galvanic piles share the same bipolar plate, as shown in fig. 6, cooling fins 2 of the bipolar plate are arranged outside two galvanic pile body regions 1 to form three cooling cavities which are respectively positioned above the upper galvanic pile, between the two galvanic piles and below the lower galvanic pile, as shown in fig. 7, a cooling medium enters the lower cooling cavity through a cooling cavity inlet 15, flows in the arrow direction, enters the middle cooling cavity and the upper cooling cavity, takes away heat generated by a battery, takes away the heat of the battery through a cooling cavity outlet 16, and finally is dissipated to the surrounding environment through an external radiating fin of the system or is used as a high-quality heat source for utilization.
According to the utility model discloses the technique assembles into two 30 outer cooling type liquid cooling fuel cell galvanic piles, and these two galvanic piles share bipolar plate, and the flow field part silvering of bipolar plate improves electric conductance corrosion protection performance, and the compound modified fluorocarbon resin of cooling part hot spraying is made insulating anticorrosion and is handled. Effective area of electrode is 100cm 2 Hydrogen is used as fuel, air is used as oxidant, the operation pressure of hydrogen is 0.5bar, the air pressure is 0.35bar, and the stoichiometric ratio of air is 2; the cooling medium is deionized water, the inlet temperature is 50 ℃, the outlet temperature is 60, the performance of the battery is shown in figure 8, and the maximum output can be 2.2 kW. Tests show that after the electric pile runs for 5000 hours, the battery performance is not obviously attenuated and still stably runs.
Comparative example 1
Three bipolar plates in the traditional shape and two membrane electrodes which are purchased in the market are assembled into a short fuel cell stack, the test conditions are the same as those in the example 1, and the maximum output of the fuel cell can be 0.6 kW. Tests show that the short stack of the fuel cell cannot stably operate after 2200 hours of operation.
Claims (8)
1. The utility model provides an external cooling type liquid cooling fuel cell bipolar plate which characterized in that: the external cooling type liquid cooling fuel cell bipolar plate is composed of a single plate, the single plate comprises a reaction area and cooling fins on two sides of the reaction area, the reaction area comprises a flow field, and a fuel inlet and a fuel outlet and an oxidant inlet and a fuel outlet are arranged in two width directions of the flow field; the peripheries of the flow field, the fuel inlet and the fuel outlet and the periphery of the oxidant inlet and the oxidant outlet are sealed by sealant; the cooling fins are provided with reinforcing ribs; the surface of the flow field of the external cooling type liquid cooling fuel cell bipolar plate is provided with a conductive anti-corrosion coating, and the surface of the cooling fin is provided with an insulating anti-corrosion coating.
2. The externally cooled, liquid cooled fuel cell bipolar plate of claim 1, wherein said fuel inlet and outlet are located diagonally to the flow field and said oxidant inlet and outlet are located diagonally to the flow field.
3. The externally-cooled liquid-cooled fuel cell bipolar plate of claim 1, wherein the externally-cooled liquid-cooled fuel cell bipolar plate is one of a metal stamped plate, a graphite engraved plate, a graphite molded plate, and a metal plate-graphite flow field composite bipolar plate; the metal stamping plate is made of one of stainless steel, aluminum plate, titanium and titanium alloy.
4. The utility model provides an external cooling type liquid cooling fuel cell sharing bipolar plate which characterized in that: the shared bipolar plate of the external cooling type liquid cooling fuel cell is composed of a single polar plate, the single polar plate comprises a middle area and cooling fins on two sides of the middle area, the middle area comprises at least two reaction areas, and the cooling fins are arranged between the two adjacent reaction areas; each reaction area comprises a flow field, and a fuel inlet and a fuel outlet and an oxidant inlet and a fuel outlet are arranged in two width directions of each flow field; the peripheries of the flow field, the fuel inlet and the fuel outlet and the periphery of the oxidant inlet and the oxidant outlet are sealed by sealant; the cooling fins are provided with reinforcing ribs; the surface of the flow field of the external cooling type liquid cooling fuel cell shared bipolar plate is provided with a conductive anti-corrosion coating, and the surface of the cooling fin is provided with an insulating anti-corrosion coating.
5. The externally cooled, liquid cooled, fuel cell bipolar plate of claim 4 wherein said fuel inlet and outlet are positioned diagonally with respect to said flow field and said oxidant inlet and outlet are positioned diagonally with respect to said flow field.
6. The externally-cooled liquid-cooled fuel cell shared bipolar plate of claim 4, wherein the externally-cooled liquid-cooled fuel cell shared bipolar plate is one of a metal stamping plate, a graphite engraving plate, a graphite stamping plate and a metal plate-graphite flow field composite bipolar plate; the metal stamping plate is made of one of stainless steel, aluminum plate, titanium and titanium alloy.
7. An external cooling type liquid cooling fuel cell stack is characterized by comprising the external cooling type liquid cooling fuel cell bipolar plate of claim 1, wherein the external cooling type liquid cooling fuel cell stack comprises an end plate, an insulating plate, a current collecting plate, a plurality of repeating units formed by alternately stacking the external cooling type liquid cooling fuel cell bipolar plates and a membrane electrode, the current collecting plate, the insulating plate and the end plate which are sequentially arranged; the cooling fin parts on two sides of the external cooling type liquid cooling fuel cell bipolar plate exceed the external cooling type liquid cooling fuel cell stack body, the cooling fins are surrounded to form an external cooling cavity of the external cooling type liquid cooling fuel cell stack, and cooling media flow through the external cooling cavity to take heat generated inside the external cooling type liquid cooling fuel cell stack out.
8. The externally-cooled liquid-cooled fuel cell parallel stack is characterized in that each fuel cell stack is assembled into a plurality of parallel stack structures through the externally-cooled liquid-cooled fuel cell shared bipolar plate in claim 4, the fuel cell stacks are connected through cooling fins among reaction regions in the externally-cooled liquid-cooled fuel cell shared bipolar plate, the cooling fins on two sides of the externally-cooled liquid-cooled fuel cell shared bipolar plate in the externally-cooled liquid-cooled fuel cell parallel stack are surrounded, and the cooling fins among the reaction regions are surrounded to form a cooling cavity of the externally-cooled liquid-cooled fuel cell parallel stack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123366094.9U CN217114452U (en) | 2021-12-28 | 2021-12-28 | External cooling type liquid cooling fuel cell bipolar plate, shared bipolar plate, galvanic pile and parallel galvanic pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123366094.9U CN217114452U (en) | 2021-12-28 | 2021-12-28 | External cooling type liquid cooling fuel cell bipolar plate, shared bipolar plate, galvanic pile and parallel galvanic pile |
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| Publication Number | Publication Date |
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| CN217114452U true CN217114452U (en) | 2022-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123366094.9U Active CN217114452U (en) | 2021-12-28 | 2021-12-28 | External cooling type liquid cooling fuel cell bipolar plate, shared bipolar plate, galvanic pile and parallel galvanic pile |
Country Status (1)
| Country | Link |
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| CN (1) | CN217114452U (en) |
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2021
- 2021-12-28 CN CN202123366094.9U patent/CN217114452U/en active Active
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