CN218769649U

CN218769649U - Multiple fuel cell stack assembly

Info

Publication number: CN218769649U
Application number: CN202222767689.3U
Authority: CN
Inventors: 阮清发; 程煜翔; 周震
Original assignee: Shanghai Qingzhi New Energy Technology Co ltd
Current assignee: Shanghai Qingzhi New Energy Technology Co ltd
Priority date: 2022-10-20
Filing date: 2022-10-20
Publication date: 2023-03-28
Anticipated expiration: 2032-10-20

Abstract

The application relates to the field of fuel cells and discloses a plurality of fuel cell stack composite sets, which can integrate a plurality of fuel cell stacks into a whole, and make a plurality of hydrogen channels, air channels and cooling liquid channels integrated into a whole respectively, thereby reducing cost and liquid resistance. The apparatus includes a fuel cell stack configured to be comprised of a plurality of fuel cell stacks vertically stacked, the fuel cell stack having a front side, a back side, two side sides, an upper surface, and a lower surface; a common floor end plate pressed against a front face of the fuel cell stack and configured to secure the plurality of fuel cell stacks; a common top end plate pressed against a back side of the fuel cell stack and configured to secure the plurality of fuel cell stacks; and first and second common gas distribution plates that integrate gas passages and liquid passages of the plurality of fuel cell stacks, respectively.

Description

Multiple fuel cell stack assembly

Technical Field

The present application relates to the field of fuel cells, and more particularly to a multiple fuel cell stack assembly.

Background

The fuel cell is an energy conversion device which converts chemical energy stored in fuel and oxidant into electric energy isothermally according to the electrochemical principle, i.e. the primary cell operation principle, so that the actual process is an oxidation-reduction reaction. A fuel cell is mainly composed of four parts, namely an anode, a cathode, an electrolyte and an external circuit. The fuel gas and the oxidizing gas are respectively introduced from the anode and the cathode of the fuel cell. The fuel gas emits electrons at the anode, which are conducted to the cathode through an external circuit and combine with the oxidizing gas to generate ions. Under the action of the electric field, the ions migrate to the anode through the electrolyte and react with the fuel gas to form a loop, and generate current. At the same time, the fuel cell also generates a certain amount of heat due to its own electrochemical reaction and the internal resistance of the cell. The cathode and anode of the battery conduct electrons and also act as a catalyst for the redox reaction. When the fuel is a hydrocarbon, the anode is required to have a higher catalytic activity. The cathode and the anode are generally porous structures so as to facilitate the introduction of reaction gas and the discharge of products. The electrolyte plays a role in transferring ions and separating fuel gas and oxidizing gas. To prevent short circuits in the cell caused by mixing of the two gases, the electrolyte is typically a dense structure.

At present, the required power of the fuel cell stack is increased, and when a single electric stack can not meet the output, double stacks or multiple stacks can be adopted for parallel or serial output to realize high power.

Disclosure of Invention

An object of the present application is to provide a multi-fuel cell stack assembly, which can integrate a plurality of fuel cell stacks into a whole, and integrate a plurality of hydrogen channels, air channels and coolant channels into a whole, thereby reducing cost and liquid resistance.

The application discloses a plurality of fuel cell stack composite set includes:

a fuel cell stack configured to be comprised of a plurality of fuel cell stacks stacked vertically, the fuel cell stack having a front side, a back side, two side sides, an upper surface, and a lower surface;

a common sub-floor end plate pressed against a front face of the fuel cell stack and configured to secure the plurality of fuel cell stacks;

a common top endplate that presses against a back side of the fuel cell stack and is configured to secure the plurality of fuel cell stacks;

the first common gas distribution plate is vertically provided with a common hydrogen inlet, a common cooling liquid outlet and a common air outlet from top to bottom, and the first common gas distribution plate is configured to enable a plurality of hydrogen inlets, a plurality of cooling liquid outlets and a plurality of air outlets of the plurality of fuel cell stacks to be respectively integrated in parallel and correspondingly connected with the common hydrogen inlet, the common cooling liquid outlet and the common air outlet; and

the second common gas distribution plate is vertically provided with a common air inlet, a common cooling liquid inlet and a common hydrogen outlet from top to bottom, and is configured to enable the multiple air inlets, the multiple cooling liquid inlets and the multiple hydrogen outlets of the multiple fuel cell stacks to be respectively integrated in parallel and correspondingly connected with the common air inlet, the common cooling liquid inlet and the common hydrogen outlet;

the first common gas panel and the second common gas panel press against the outer surface of the common bottom/top endplate.

In a preferred example, the fuel cell stack includes a stack negative electrode sheet fixed to a front face of the fuel cell stack.

In a preferred example, the fuel cell stack includes a stack positive electrode sheet fixed to the back side of the fuel cell stack.

In a preferred embodiment, the fuel cell stack includes a copper bar, and the copper bar connects the positive and negative electrodes of the plurality of fuel cell stacks in series or in parallel.

In a preferred example, the fuel cell stack includes a stack strap configured to integrally fix unit cells in the plurality of fuel cell stacks.

In a preferred embodiment, the common bottom endplate and the common top endplate are provided with slits configured to allow a stack strap to pass through the common bottom endplate and the common top endplate.

In a preferred embodiment, the number of the fuel cell stacks is 2 to 10.

In a preferred embodiment, the diameter of the common hydrogen inlet port and the common hydrogen outlet port is 15mm to 30mm.

In a preferred embodiment, the diameter of the common air inlet and the common air outlet is 40mm to 70mm.

In a preferred embodiment, the common coolant inlet and the common coolant outlet have a diameter of 30mm to 60mm.

In the embodiment of the application, the plurality of fuel cell stacks share the top layer end plate and the bottom layer end plate, the structure is compact, and the integration level is high.

Furthermore, because the number of the hydrogen inlets and the hydrogen outlets of the plurality of fuel cells is 1, the integration of the system and the simplification of the system pipeline are facilitated.

Furthermore, because the number of the air inlets and the air outlets of the plurality of fuel cells is 1, only one air compressor can be used for supplying air for one set of system, and the cost is greatly reduced;

furthermore, because the cooling liquid inlet and outlet of a plurality of fuel cells are connected in parallel, only one cooling water pump can be used, and the water resistance is greatly reduced.

The present specification describes a number of technical features distributed throughout the various technical aspects, and if all possible combinations of technical features (i.e. technical aspects) of the present specification are listed, the description is made excessively long. In order to avoid this problem, the respective technical features disclosed in the above summary of the invention of the present application, the respective technical features disclosed in the following embodiments and examples, and the respective technical features disclosed in the drawings may be freely combined with each other to constitute various new technical solutions (which are considered to have been described in the present specification) unless such a combination of the technical features is technically infeasible. For example, in one example, the feature a + B + C is disclosed, in another example, the feature a + B + D + E is disclosed, and the features C and D are equivalent technical means for the same purpose, and technically only one feature is used, but not simultaneously employed, and the feature E can be technically combined with the feature C, then the solution of a + B + C + D should not be considered as being described because the technology is not feasible, and the solution of a + B + C + E should be considered as being described.

Drawings

Fig. 1 is a schematic structural diagram according to an embodiment of the present application.

FIG. 2 is a schematic view of a channel allocation structure according to an embodiment of the present application.

Description of reference numerals:

1-sharing a hydrogen outlet; 2-shared cooling liquid inlet; 3-common air inlet; 4-a second common gas panel; 5-shared bottom end plate; 6-common top end plate; 7-a positive plate of the galvanic pile; 8-galvanic pile binding band; 9-a cell stack; stack No. 10-B; 11-a first common gas panel; 12-common hydrogen inlet; 13-common air outlet; 14-common coolant outlet; 15-a stack negative plate; 16-copper bar

Detailed Description

In the following description, numerous technical details are set forth in order to provide a better understanding of the present application. However, it will be understood by those skilled in the art that the technical solutions claimed in the present application may be implemented without these technical details and with various changes and modifications based on the following embodiments.

The following detailed description of specific implementations of the present invention is made with reference to the following embodiments and accompanying drawings:

as shown in fig. 1, a plurality of fuel cell stack assemblies includes: a fuel cell stack, a common bottom end plate 5, a common top end plate 6, a first common gas distribution plate 11, and a second common gas distribution plate 4.

The fuel cell stack is configured to be composed of a plurality of fuel cell stacks vertically stacked, and the fuel cell stack composed of a number a of the cell stacks 9 and a number B of the cell stacks 10 vertically stacked is shown in the present embodiment, and alternatively, the number of the fuel cell stacks is 2 to 10. The fuel cell stack has a front side, a back side, two side surfaces, an upper surface, and a lower surface. A common bottom end plate 5 is pressed against the front face of the fuel cell stack and is configured to hold a plurality of fuel cell stacks. A common top end plate 6 is pressed against the back of the fuel cell stack and is configured to hold a plurality of fuel cell stacks.

The first common gas distribution plate 11 is vertically provided with a common hydrogen inlet 12, a common cooling liquid outlet 14 and a common air outlet 13 from top to bottom, and the first common gas distribution plate 11 is configured to enable a plurality of hydrogen inlets, a plurality of cooling liquid outlets and a plurality of air outlets of a plurality of fuel cell stacks to be respectively integrated in parallel and correspondingly connected with the common hydrogen inlet 12, the common cooling liquid outlet 14 and the common air outlet 13. The second common gas distribution plate 4 is vertically provided with a common air inlet 3, a common cooling liquid inlet 2 and a common hydrogen outlet 1 from top to bottom, and the second common gas distribution plate 4 is configured to enable a plurality of air inlets, a plurality of cooling liquid inlets and a plurality of hydrogen outlets of a plurality of fuel cell stacks to be respectively integrated in parallel and correspondingly connected with the common air inlet 3, the common cooling liquid inlet 2 and the common hydrogen outlet 1.

The first common gas panel 11 and the second common gas panel 4 are pressed against the outer surface of the common bottom end panel 5/common top end panel 6.

Alternatively, the fuel cell stack includes the stack negative electrode sheet 15, and the stack negative electrode sheet 15 is fixed to the front face of the fuel cell stack. Alternatively, the fuel cell stack includes a stack positive electrode tab 7, and the stack positive electrode tab 7 is fixed to the back surface of the fuel cell stack. Alternatively, the fuel cell stack includes stack straps 8, and stack straps 8 are configured to integrally fix unit cells in a plurality of fuel cell stacks. Optionally, the common bottom endplate 5 and the common top endplate 6 are provided with slits configured to allow the stack straps 8 to pass through the common bottom endplate 5 and the common top endplate 6. Optionally, the fuel cell stack includes a copper bar 16, and the copper bar 16 connects the positive and negative poles of the plurality of fuel cell stacks in series or in parallel.

Alternatively, the diameter of the common hydrogen inlet 12 and the common hydrogen outlet 1 is 15mm to 30mm, preferably 25mm. Optionally, the diameter of the common air inlet 3 and the common air outlet 13 is 40mm to 70mm, preferably 57mm. Optionally, the common coolant inlet 2 and the common coolant outlet 14 have a diameter of 30mm to 60mm, preferably 50mm.

Optionally, the positive and negative outputs of a plurality of fuel cell stacks may be connected in series, the output voltage may be doubled, and the stack positive plate 7 and the stack negative plate 15 may be directly connected to a dc converter for output, thereby saving the cost of the dc converter.

Alternatively, the positive and negative outputs of the multiple fuel cell stacks may be in parallel, the output voltages of the multiple fuel cell stacks are unchanged, and the current is doubled.

Fig. 2 shows the parallel connection of the hydrogen gas inlet/outlet ports, the cooling liquid inlet/outlet ports and the air inlet/outlet ports of the fuel cell stacks, and if there are more fuel cell stacks, the same parallel connection operation is performed below or above the fuel cell stacks, and the lengths of the common bottom end plate 5, the common top end plate 6, the first common gas distribution plate 11, the second common gas distribution plate 4, the stack positive plate 7 and the stack negative plate 15 are correspondingly increased to match the height of the increased fuel cell stacks.

It is noted that, in the present patent application, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In the present patent application, if it is mentioned that a certain action is executed according to a certain element, it means that the action is executed according to at least the element, and two cases are included: performing the action based only on the element, and performing the action based on the element and other elements. The expression of a plurality of, a plurality of and the like includes 2, 2 and more than 2, more than 2 and more than 2.

All documents mentioned in this application are to be considered as being incorporated in their entirety into the disclosure of this application so as to be subject to modification as necessary. Further, it should be understood that various changes or modifications can be made to the present application by those skilled in the art after reading the above disclosure of the present application, and these equivalents also fall within the scope of the present application as claimed.

Claims

1. A multiple fuel cell stack assembly comprising:

a fuel cell stack configured to be comprised of a plurality of fuel cell stacks vertically stacked, the fuel cell stack having a front side, a back side, two side sides, an upper surface, and a lower surface;

2. The combination of claim 1 wherein said fuel cell stack includes a stack negative plate, said stack negative plate affixed to a front face of said fuel cell stack.

3. The combination of claim 1, wherein said fuel cell stack includes a stack positive tab secured to a back side of said fuel cell stack.

4. The combination of claim 1, wherein the fuel cell stack comprises copper bars connecting the positive and negative poles of the plurality of fuel cell stacks in series or in parallel.

5. The combination of claim 1, wherein the fuel cell stack comprises a stack strap configured to integrally secure the cell sheets of the plurality of fuel cell stacks.

6. The combination of claim 1, wherein the common bottom endplate and the common top endplate are provided with apertures configured to allow stack straps to pass through the common bottom endplate and the common top endplate.

7. The combination of claim 1 wherein the number of fuel cell stacks is from 2 to 10.

8. The combination of claim 1, wherein the common hydrogen inlet port and the common hydrogen outlet port have a diameter of 15mm to 30mm.

9. A combination according to claim 1, wherein the common air inlet and the common air outlet have a diameter of from 40mm to 70mm.

10. The combination of claim 1, wherein the common coolant inlet and the common coolant outlet have a diameter of 30mm to 60mm.