CN218867166U - Pressure detection device for fuel cell stack - Google Patents

Abstract

A pressure detecting device for a fuel cell stack adapted to be disposed between a first cell group and a second cell group of the stack, the pressure detecting device for a fuel cell stack comprising: the battery pack comprises a first insulating partition plate, a second insulating partition plate, a conductive assembly and at least one pressure sensor, wherein the conductive assembly is suitable for being electrically connected between the first battery pack and the second battery pack, and the pressure sensor is clamped between the first insulating partition plate and the second insulating partition plate. The pressure detection device is suitable for being arranged in the middle of the galvanic pile, can more accurately detect the internal pressure of the galvanic pile and provides data guidance for stages of design, assembly, verification and the like of the galvanic pile.

Description

Pressure detection device for fuel cell stack

Technical Field

The application relates to the technical field of fuel cells, in particular to a pressure detection device for a fuel cell stack.

Background

A fuel cell is an energy conversion device that converts chemical energy of fuel into electrical energy through an electrochemical reaction. The fuel cell has the advantages of high energy conversion efficiency, low pollution degree, low noise, high reliability and the like. A plurality of fuel cell units (unit cells) are stacked and combined in series to form a fuel cell stack, and a fuel cell system with the fuel cell stack as a core can be widely applied to the fields of automobiles, airplanes, trains, power stations and the like.

It is worth mentioning that the internal pressure of the fuel cell stack is one of the important factors affecting the performance of the fuel cell. When the internal pressure of the fuel cell stack is too high, the membrane electrode assembly may be excessively pressurized, which may affect the diffusion of the reaction gas in the GDL (gas diffusion layer), and when the internal pressure is too low, the sealability of the fuel cell may be reduced, and the contact resistance may be too high. In the process of assembling the fuel cell stack, after all the stacked components are pressed by a pressing machine with preset assembling force, the fuel cell stack is integrally fastened through fastening elements such as a screw or a metal strapping tape, and finally the force application end of the pressing machine is lifted, and the assembling force is removed. Subsequently, the respective components of the fuel cell stack are released to some extent, and the internal pressure of the fuel cell stack gradually decreases to a stable value due to elastic deformation of the fastening members and the respective components of the fuel cell stack. Therefore, in the design verification stage of the fuel cell stack, it is necessary to detect the internal pressure of the fuel cell stack in order to find the optimum internal pressure, and the assembly conditions under which the pressure can be achieved.

At present, there are some detection apparatuses and detection schemes for detecting the internal pressure of the fuel cell stack, but there are many drawbacks, for example, some detection schemes for detecting the internal pressure of the fuel cell stack are: the internal pressure of the fuel cell stack is detected by a pressure detection device provided between an end plate of the fuel cell stack and the single cell group. However, the pressure detection device measures the pressure actually at the end portions of the fuel cell stack, particularly the pressure to which the end plates are subjected, which does not truly reflect the internal pressure to which the single cells are subjected. Therefore, the internal pressure data obtained by such detection scheme detection is inaccurate. In addition, there are also some detection schemes for detecting the internal pressure of the fuel cell stack, which are only suitable for detecting the internal pressure of the fuel cell stack in a non-operating state. However, when the fuel cell stack is operated, the internal pressure of the fuel cell stack is different from the non-operating state due to the influence of various factors such as temperature, pressure of the reaction gas, and pressure of the cooling liquid.

Therefore, a new detection scheme suitable for detecting the internal pressure of the fuel cell stack is desired.

SUMMERY OF THE UTILITY MODEL

An advantage of the present application is to provide a pressure sensing apparatus for a fuel cell stack, wherein the pressure sensing apparatus is capable of sensing an internal pressure of the stack in real time, and providing data guidance for stages of design, assembly, and verification of the stack.

Another advantage of the present application is to provide a pressure detecting apparatus for a fuel cell stack, in which the pressure detecting apparatus is adapted to be disposed at a middle portion of the stack, and can more accurately detect an internal pressure of the stack.

Still another advantage of the present application is to provide a pressure detecting device for a fuel cell stack, wherein in the scheme of using the pressure detecting device to detect the pressure of the stack, the cell groups of the stack are divided into two groups of cells, and the pressure detecting device is disposed between the two groups of cells, so as to reflect the pressure of the cells of the stack more truly.

Still another advantage of the present application is to provide a pressure detecting apparatus for a fuel cell stack, wherein the pressure detecting apparatus can perform pressure detection not only on a test stack in a non-operating state but also on the test stack in an operating state, thereby simulating an actual operating condition of the stack and detecting an internal pressure thereof.

To achieve at least one of the above advantages or other advantages and objects, there is provided a pressure detecting apparatus for a fuel cell stack, wherein the pressure detecting apparatus for a fuel cell stack is adapted to be disposed between a first cell stack and a second cell stack of the stack, the pressure detecting apparatus for a fuel cell stack including:

a first insulating spacer;

a second insulating spacer;

a conductive assembly adapted to be electrically connected between the first battery pack and the second battery pack; and

at least one pressure sensor sandwiched between the first insulating spacer and the second insulating spacer.

In the pressure detecting device for a fuel cell stack according to the present application, the pressure sensor includes a sensor body, and the first insulating spacer has at least one first body limiting groove, and the sensor body is limited in the first body limiting groove.

In the pressure detecting device for a fuel cell stack according to the present application, the second insulating partition plate has a receiving groove, and the sensor main body corresponds to the receiving groove.

In the pressure detection device for a fuel cell stack according to the present application, the pressure detection device for a fuel cell stack includes a gasket installed between the groove bottom of the accommodating groove and the pressure sensor, and the strength of the gasket is greater than the strength of the groove bottom of the accommodating groove.

In the pressure detecting device for a fuel cell stack according to the present application, the first insulating separator has first and second opposite surfaces, a first side surface extending between the first and second surfaces, and a first flow guide passage extending between the first and second surfaces or between the second and first side surfaces.

In the pressure detecting device for a fuel cell stack according to the present application, the second insulating separator has opposite third and fourth surfaces, a second side surface extending between the third and fourth surfaces, and a second flow guide passage extending between the third and fourth surfaces or between the fourth and second side surfaces.

In the pressure detecting device for a fuel cell stack according to the present application, the conductive member includes a first conductive member adapted to be electrically connected to the first cell group and a second conductive member adapted to be electrically connected to the second cell group, the first conductive member being connected to the second conductive member at a side of the cell.

In the pressure detecting device for a fuel cell stack according to the present application, the first conductive member includes a first main body portion mounted to the first insulating separator and a first connecting portion extending from the first main body portion to the second insulating separator, the second conductive member includes a second main body portion mounted to the second insulating separator and a second connecting portion extending from the second main body portion to the first insulating separator, and the first connecting portion corresponds to the second connecting portion.

In the pressure detecting device for a fuel cell stack according to the present application, the first connecting portion has at least one first fixing hole, and the second connecting portion has at least one second fixing hole corresponding to the first fixing hole.

In the pressure detection device for a fuel cell stack according to the present application, the first conductive element is fitted to the first insulating separator, and the second conductive element is fitted to the second insulating separator.

Further objects and advantages of the present application will become apparent from an understanding of the ensuing description and drawings.

These and other objects, features and advantages of the present application will become more fully apparent from the following detailed description, the accompanying drawings and the claims.

Drawings

These and/or other aspects and advantages of the present application will become more apparent and more readily appreciated from the following detailed description of the embodiments of the present application, taken in conjunction with the accompanying drawings of which:

fig. 1 illustrates a schematic structural view of a stack and a pressure detection device according to an embodiment of the present application.

Fig. 2 illustrates a schematic structural diagram of a modified embodiment of the stack and the pressure detection device according to an embodiment of the present application.

Fig. 3 illustrates a perspective view of a pressure detection device according to an embodiment of the present application.

Fig. 4 illustrates a disassembled schematic view of a pressure detection device according to an embodiment of the present application.

FIG. 5 illustrates another disassembled schematic view of a pressure detection apparatus according to an embodiment of the present application.

Detailed Description

The terms and words used in the following specification and claims are not limited to the literal meanings, but are used only by the inventors to enable a clear and consistent understanding of the application. Accordingly, it will be apparent to those skilled in the art that the following descriptions of the various embodiments of the present application are provided for illustration only and not for the purpose of limiting the application as defined by the appended claims and their equivalents.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

While ordinal numbers such as "first", "second", etc., will be used to describe various components, those components are not limited thereto. The term is used only to distinguish one element from another. For example, a first component can be termed a second component, and, similarly, a second component can also be termed a first component, without departing from the teachings of the present concepts. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, numbers, steps, operations, components, elements, or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, elements, or groups thereof.

Exemplary pressure detection device

The present application provides a detection scheme for detecting an internal pressure of a fuel cell stack, and in turn, proposes a stack pressure detection system 100, as shown in fig. 1 to 5, a stack pressure detection system 100 according to an embodiment of the present application is illustrated, the stack pressure detection system 100 including a stack 10 and a pressure detection device 20 for detecting an internal pressure of the stack 10. Specifically, in the present application, in the scheme of using the pressure detection device 20 to detect the pressure of the cell stack 10, the cell groups (a plurality of cells stacked on each other) of the cell stack 10 are divided into two groups of cell groups, and the pressure detection device 20 is disposed between the two groups of cell groups to detect the internal pressure of the cell stack 10. Compared with the scheme of detecting the internal pressure of the electric pile 10 by the pressure detection equipment arranged at the end part of the electric pile 10, in the detection scheme of the application, the pressure detection device 20 is arranged in the middle of the electric pile 10, namely, between the two groups of battery packs, so that the internal pressure of the electric pile 10 can be more accurately detected. In other words, the pressure detection device 20 is provided between the two cell groups of the cell stack 10, and can reflect the pressure to which the cells of the cell stack 10 are subjected more truly. It is worth mentioning that the unit cell includes a cathode plate, an anode plate, and a membrane electrode assembly disposed between the cathode plate and the anode plate.

More specifically, in the present embodiment, the stack 10 includes a first end plate assembly 110, a second end plate assembly 120, and a first battery pack 11 and a second battery pack 12 spaced apart from each other, wherein the first battery pack 11 and the second battery pack 12 are disposed between the first end plate assembly 110 and the second end plate assembly 120. The first end plate assembly 110 includes a first end plate 111 and a first current collecting plate, and the second end plate assembly 120 includes a second end plate and a second current collecting plate. Optionally, the first end plate assembly 110 further includes a first insulation plate 112 disposed between the first end plate and the first current collecting plate, and the second end plate assembly 120 further includes a second insulation plate 122 disposed between the second end plate 121 and the second current collecting plate.

The first cell stack 11 has a plurality of first fluid channels 1101 for transmitting a fluid, and the first fluid channels 1101 includes a plurality of inlet and outlet channels for transmitting a fuel, an oxidant or a heat exchange medium, respectively, wherein the first fluid channels 1101 extend through all the cells of the first cell stack 11 for supplying the fuel, the oxidant or the heat exchange medium to each cell of the first cell stack 11. Accordingly, the second cell stack 12 has a plurality of second fluid channels 1201 for transmitting a fluid, and the second fluid channels 1201 include a plurality of inlet and outlet channels for transmitting a fuel, an oxidant or a heat exchange medium, respectively, wherein the second fluid channels 1201 extend through all the unit cells of the second cell stack 12 for supplying the fuel, the oxidant or the heat exchange medium to each unit cell of the second cell stack 12. It will be understood by those skilled in the art that the number of the first and second fluid channels 1101 and 1201 is determined by the type of the stack 10 and the structural design of the cathode and anode plates of the unit cells thereof. More specifically, when the stack 10 is a water (liquid) cooling type fuel cell stack, the first fluid passage 1101 and the second fluid passage 1201 include an inlet and outlet passage for a heat exchange medium, and conversely, when the stack 10 is an air cooling type fuel cell stack, the first fluid passage 1101 and the second fluid passage 1201 no longer include an inlet and outlet passage for a heat exchange medium; in addition, in some fuel cell stacks, the number of unidirectional channels for a certain fluid may be greater than one, for example, the number of fuel inlet channels may be greater than one, which inevitably results in a variation in the number of the first fluid channels 1101 and the second fluid channels 1201. Preferably, the single cells of the first cell group 11 and the second cell group 12 both adopt the cathode plate and the anode plate with the same structural design, and further the two fluid channels of the first fluid channel 1101 and the second fluid channel 1201 are characterized in that: the number of the first fluid channels 1101 is the same as the number of the second fluid channels 1201; the number of inlet and outlet channels for transferring fuel, oxidant or heat exchange medium in the first fluid channel 1101 is the same as the number of inlet and outlet channels for transferring fuel, oxidant or heat exchange medium in the second fluid channel 1201.

The stack 10 also comprises fastening elements 13 for constraining and fixing the various components of the stack 10 to form a structurally stable whole. Specifically, the embodiment of the fastening element 13 is not limited in this application, for example, the fastening element 13 may be implemented as a metal strapping band surrounding the stack 10, and may also be implemented as a screw or a lead screw fastened between the first end plate assembly 110 and the second end plate assembly 120.

As shown in fig. 1 and 2, the pressure detection device 20 is provided between the first battery pack 11 and the second battery pack 12. Specifically, as shown in fig. 3 to 5, the pressure detection device 20 includes a first insulating partition 211, a second insulating partition 221, and at least one pressure sensor 23 interposed between the first insulating partition 211 and the second insulating partition 221. The first insulating spacer 211 abuts against the single cells located at the end of the first cell group 11, and the second insulating spacer 221 abuts against the single cells located at the end of the second cell group 12. When the first cell stack 11 and the second cell stack 12 are pressurized, the pressure is transmitted to the first insulating spacer 211 through the unit cell located at the end of the first cell stack 11, and is transmitted to the second insulating spacer 221 through the unit cell located at the end of the second cell stack 12. In this way, the pressure sensor 23 disposed between the first insulating partition 211 and the second insulating partition 221 may measure the internal pressure of the stack 10, which truly reflects the pressure to which the cells of the stack 10 are subjected.

In assembling the stack 10, the first battery pack 11 and the second battery pack 12 may be compressed by a compressor, and then the first battery pack 11 and the second battery pack 12 may be fastened by the fastening member 13, so that the pressure sensor 23 in the pressure detecting device 20 provided between the first battery pack 11 and the second battery pack 12 is compressed. The pressure sensor 23 may be communicatively connected to a computer device by which pressure data collected by the pressure sensor 23 may be acquired and recorded. Further, an internal pressure change trend map may be drawn by the computer device.

Specifically, the first insulating partition 211 has a first surface 2101 and a second surface 2102 opposing each other, and a first side surface 2103 extending between the first surface 2101 and the second surface 2102, wherein the first surface 2101 faces the pressure sensor 23, and the second surface 2102 faces the first battery pack 11. The pressure detection device 20 further includes a first conductive element 241 disposed on the first insulating partition 211, wherein the first conductive element 241 is embedded on the second surface 2102 side of the first insulating partition 211, so as to electrically connect the first conductive element 241 with the first battery pack 11 directly or indirectly. It is understood that the first conductive element 241 may be in direct contact with the single cells at the end of the first battery pack 11, or an additional conductive layer may be provided to electrically connect the first conductive element 241 and the first battery pack 11, so as to enhance conductivity, such as carbon paper, graphite paper or other conductive layers may be provided between the first conductive element 241 and the single cells at the end of the first battery pack 11.

The second insulating partition 221 has third and fourth opposite surfaces 2201 and 2202, and a second side surface 2203 extending between the third and fourth surfaces 2201 and 2202, wherein the third surface 2201 faces the pressure sensor 23 and the fourth surface 2202 faces the second battery pack 12. The pressure detecting device 20 further includes a second conductive element 242 disposed on the second insulating partition 221, wherein the second conductive element 242 is embedded on the side of the fourth surface 2202 of the second insulating partition 221 so as to electrically connect the second conductive element 242 directly or indirectly with the second battery pack 12. It is understood that the second conductive element 242 may be in direct contact with the single cells at the end of the second battery pack 12, or an additional conductive layer may be provided to electrically connect the second conductive element 242 with the second battery pack 12, so as to enhance the conductivity, such as carbon paper, graphite paper or other conductive layer is provided between the second conductive element 242 and the single cells at the end of the second battery pack 12.

More specifically, the pressure sensor 23 is confined between the first insulating spacer 211 and the second insulating spacer 221. It should be understood that the position limiting structure may be provided only on the first insulating partition 211, only on the second insulating partition 221, and also on both the first insulating partition 211 and the second insulating partition 221.

In a specific example of the present application, the limiting structure is only provided on the first insulating partition 211. Specifically, the pressure sensor 23 includes a sensor body 231, and the first insulating spacer 211 has a first body-limiting groove 2104 fitted to the sensor body 231, and the first body-limiting groove 2104 is used for accommodating a portion of the sensor body 231 and restraining the sensor body 231 from excessive lateral (parallel to the direction of the first surface 2101 or the second surface 2102) movement, thereby achieving a limiting effect.

It is worth mentioning that, since the first insulating partition 211 and the second insulating partition 221 are made of insulating material, such as polyphenylene sulfide (PPS) material or other plastics, which have low hardness and low ability to locally resist hard objects from being pressed into the surfaces thereof, in order to prevent the first insulating partition 211 and/or the second insulating partition 221 from being excessively deformed by the action force of the sensor 23, such as generating a recess, a breakage, etc., the pressure detection apparatus 20 further includes a gasket 25 disposed between the first insulating partition 211 and the pressure sensor 23, and/or between the second insulating partition 221 and the pressure sensor 23, so as to increase the force-bearing area and prevent local stress concentration. Preferably, in a specific example of the present application, as shown in fig. 4 and 5, the second insulating partition 221 is provided with a receiving groove 2204 for receiving and restraining the gasket 25. It is understood that a gasket (not shown in the figures) between the first insulating spacer 211 and the pressure sensor 23 may be directly disposed in the first body-defining groove 2104 of the first insulating spacer 211.

In the embodiment, the pressure sensor 23 further includes a communication structure disposed on the sensor body 231 for being communicatively connected to other equipment, such as the computer equipment. The communicative connection between the pressure sensor 23 and other devices is not limited in this application, and for example, the pressure sensor may be connected to other devices through a wired connection, or may be connected to other devices through a wireless communication. Accordingly, the communication structure can be implemented as an electrical connection wire 232 electrically connected to the sensor body 231, and can also be implemented as a wireless communication port electrically connected to the sensor body 231.

In a specific example of the present application, the pressure sensor 23 further includes an electrical connection line 232 electrically connected to the sensor body 231, the first insulating partition 211 has at least one connection line seating slot 2105, and the electrical connection line 232 is adapted to be received in the connection line seating slot 2105. The connecting wire seating groove 2105 extends from the first body limiting groove 2104 to the outer surface of the first insulating partition 211 to form an outlet port 2106. It should be understood that the connecting wire seating groove 2105 and the outlet port 2106 may be formed in the second insulating spacer 221.

It will be understood by those skilled in the art that the pressure applied to the stack 10 by the fastening elements 13 cannot be transmitted completely uniformly to the inside, i.e. different regions of the cells of the stack 10 are stressed differently, in particular between the region facing the fastening elements 13 and other regions. Therefore, in order to detect the force applied to the region of the cell facing the fastening member 13 as accurately as possible, the number of the pressure sensors 23 of the pressure detection device 20 is the same as the number of the fastening members 13, and the pressure sensors 23 are disposed facing the corresponding fastening members 13. Furthermore, in order to prevent the fastening element 13 from obstructing the electrical connection wires 232 from protruding out of the first insulating partition 211, the connection wire seating groove 2105 extends from the first body limiting groove 2104 to the outer surface of the first insulating partition 211 along an inclined extending direction so that the outlet port 2106 is offset from the fastening element 13. The "inclination" in the inclined extending direction means not parallel to the plane on which the first side surface 2103 of the first insulating spacer 211 is located. In a specific example of the present application, an extending direction of a portion of the pressing member 13 corresponding to the first surface 2101 of the first insulating spacer 211 coincides with a width extending direction of the first insulating spacer 211, and an extending direction of a portion of the pressing member 13 corresponding to the first side surface 2103 of the first insulating spacer 211 coincides with a thickness extending direction of the first insulating spacer 211. Accordingly, the extending direction of the connecting wire seating groove 2105 is deviated from the width extending direction of the first insulating spacer 211.

In the embodiment of the present application, the first insulating partition 211 has first flow guide channels 210 adapted to be respectively communicated with the first fluid channels 1101, and the second insulating partition 221 has second flow guide channels 220 adapted to be respectively communicated with the second fluid channels 1201, so as to realize fluid transfer between the first cell stack 11 and the second cell stack 12 without changing the original structures of the respective components of the cell stack 10. The first fluid channel 1101 and the second fluid channel 1201 can communicate through communication between the first flow guide channel 210 of the first insulating partition 211 and the second flow guide channel 220 of the second insulating partition 221, thereby achieving fluid transfer between the first cell stack 11 and the second cell stack 12. Specifically, the communication between the first guide passage 210 and the second guide passage 220 may be achieved by providing a guide tube 26 communicating between the first guide passage 210 and the second guide passage 220.

The specific embodiments of the first flow guide passage 210 and the second flow guide passage 220 are not limited in this application. For example, in the case of a liquid,

in one specific example of the present application, the first flow guiding channel 210 has a first flow guiding opening 2111 and a second flow guiding opening 2112, the first flow guiding opening 2111 is formed on the second surface 2102, and the second flow guiding opening 2112 is formed on the first surface 2101, in such a way that the first flow guiding channel 210 extends between the first surface 2101 and the second surface 2102. In another specific example of the present application, the first flow guide opening 2111 is formed in the second surface 2102 and the second flow guide opening 2112 is formed in the first side surface 2103, in such a manner that the first flow guide channel 210 extends between the second surface 2102 and the first side surface 2103. When the first insulating partition 211 is disposed in the first cell stack 11, the first flow guide ports 2111 communicate with the corresponding first fluid passages 1101, so that the first flow guide passages 210 communicate with the corresponding first fluid passages 1101.

In one specific example of the present application, the second flow guide channel 220 has a third flow guide 2211 and a fourth flow guide 2212, the third flow guide 2211 is formed on the third surface 2201, and the fourth flow guide 2212 is formed on the fourth surface 2202, and in this way, the second flow guide channel 220 extends between the third surface 2201 and the fourth surface 2202. In another specific example of the present application, the third flow guide opening 2211 is formed in the second side surface 2203, and the fourth flow guide opening 2212 is formed in the fourth surface 2202, in such a way that the second flow guide passage 220 extends between the fourth surface 2202 and the second side surface 2203. When the second insulating partition 221 is disposed in the second cell stack 12, the fourth flow guide ports 2212 communicate with the corresponding second fluid passages 1201, so that the second flow guide passages 220 communicate with the corresponding second fluid passages 1201.

It is worth mentioning that the number of the first flow guiding passage 210, the first flow guiding opening 2111 and the second flow guiding opening 2112 is the same as that of the first fluid passage 1101, and the number of the second flow guiding passage 220, the third flow guiding opening 2211 and the fourth flow guiding opening 2212 is the same as that of the second fluid passage 1201. It is understood that the numbers of the first flow guiding channel 210, the second flow guiding channel 220, the first flow guiding opening 2111, the second flow guiding opening 2112, the third flow guiding opening 2211 and the fourth flow guiding opening 2212 shown in the drawings of the present application are only illustrative and not considered to limit the protection scope, and the numbers can be adaptively adjusted according to the type of the stack 10 and the specific structural design of the cathode plate and the anode plate.

When the internal pressure of the cell stack 10 in the operating state is detected, the first flow channel 1101 of the first cell stack 11 and the second flow channel 1201 of the second cell stack 12 can be communicated through the flow guide pipe 26, and by introducing the corresponding fluid required for the reaction to the first cell stack 11 or the second cell stack 12, the fluid can be supplied to each cell of the first cell stack 11 and the second cell stack 12, so that the cell stack 10 enters the operating state. That is, without changing the original structure of the single-side fluid supply of the stack, the fluid supply can be realized through the first flow guide channel 210 of the first insulating partition 211 and the second flow guide channel 220 of the second insulating partition 221, so as to ensure that the internal pressure of the stack in the operating state can be detected.

In the embodiment of the present application, the pressure detecting device 20 includes an electrically conductive member 24 electrically connected between the first battery pack 11 and the second battery pack 12 to ensure the electrical connection between the first battery pack 11 and the second battery pack 12, so that the electrochemical reaction of the stack 10 can be performed normally.

Specifically, in the embodiment of the present application, the conductive assembly 24 includes a first conductive member 241 adapted to be electrically connected to the first battery pack 11 and a second conductive member 242 adapted to be electrically connected to the second battery pack 12, wherein the first conductive member 241 is adapted to be electrically connected to the second conductive member 242. The first conductive element 241 and the second conductive element 242 may be connected in a direct contact manner, for example, the connection ends (portions) extending outward from the first conductive element and the second conductive element are overlapped with each other, and of course, a conductive layer (such as conductive silver paste or conductive silver paste) may be disposed between the connection ends (portions) of the first conductive element and the second conductive element to enhance the conductive performance, that is, the first conductive element 241 and the second conductive element 242 may be connected in a non-direct contact manner, and the electrical connection therebetween is indirectly achieved by additionally disposing the conductive layer. It is understood that "electrically connected" means that current can be conducted between the two, and does not mean that the two have a direct contact relationship.

In order to facilitate the external sealing of the communication between the first flow guide channel 210 and the first fluid channel 1101, and the external sealing of the communication between the second flow guide channel 220 and the second fluid channel 1201, preferably, the first conductive element 241 is disposed on the first insulating partition 211 in a manner of being embedded in the first insulating partition 211, and the second conductive element 242 is disposed on the second insulating partition 221 in a manner of being embedded in the second insulating partition 221.

In this specific example, the first insulating spacer 211 has a first fitting groove 2107, and the first conductive element 241 includes a first main body portion 2411 and a first connection portion 2412. The first main body 2411 is fitted into the first fitting groove 2107 of the first insulating partition 211. Preferably, the first main body portion 2411 is flush with the second surface 2102 of the first insulating partition 211. The second insulating partition 221 has a second fitting groove 2207, the second conductive element 242 includes a second main body part 2421 and a second connecting part 2422, and the second main body part 2421 is fittingly mounted in the second fitting groove 2207 of the second insulating partition 221. Preferably, the second body part 2421 is flush with the fourth surface 2202 of the second insulating partition 221. The first connection part 2412 extends from the first main body part 2411 to the second conductive element 242, the second connection part 2422 extends from the second main body part 2421 to the first conductive element 241 so that the first connection part 2412 and the second connection part 2422 can be lapped with each other, and overlapping regions (mutually facing regions) of the first connection part 2412 and the second connection part 2422 form a lapping region of the first conductive element 241 and a lapping region of the second conductive element 242. When the pressure detection apparatus 20 is used, a conductive material such as a conductive silver paste or a conductive silver paste may be coated on the overlapping area of the first conductive element 241 and/or the overlapping area of the second conductive element 242 to form a conductive layer therebetween, so as to enhance the conductivity between the first conductive element 241 and the second conductive element 242 and the reliability of the electrical connection.

Further, the first connection portion 2412 has at least one first fixing hole 2401, and the second connection portion 2422 has at least one second fixing hole 2402 corresponding to the first fixing hole 2401. Bolts or other fixing elements can be used to pass through the first fixing holes 2401 and the second fixing holes 2402 and fix the first connecting portions 2412 and the second connecting portions 2422, so as to prevent poor contact between the two parts and even separation of the two parts.

It is worth mentioning that, in this application, the pressure detection device 20 is utilized to carry out the pressure detection scheme on the galvanic pile 10, so that not only the galvanic pile 10 in the non-working state can be subjected to the pressure detection, but also the galvanic pile 10 in the working state can be subjected to the pressure detection, and the detection scheme can realize the real-time detection. In order to detect the internal pressure of the stack in the working state, that is, to solve the technical problem of how to arrange the pressure detection device between two cells of the stack, and still enable two separated battery packs to normally work to ensure that the stack is in the working state, the creativity of the present application is further highlighted by the following core concept and technical scheme: the problem of fluid conduction is solved by forming a flow guide channel in the insulating partition plate; the problem of electric conduction is solved by arranging the electric conduction assembly so as to ensure that the electrochemical reaction can be carried out; in addition, the insulating partition plate can prevent the current from influencing the pressure sensor of the pressure detection device.

Generally, real-time detection of the internal pressure of the stack 10 guides the stages of design, assembly, and verification of the fuel cell stack 10. For example, the more or most appropriate length of the metal strapping band, or the degree of locking of the screw or rod, is determined based on the trend of the internal pressure of the stack 10 over time after assembly.

The foregoing describes the general principles of the present application in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present application are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.

Claims (10)

1. A pressure detecting device for a fuel cell stack, characterized in that the pressure detecting device for a fuel cell stack is adapted to be disposed between a first cell group and a second cell group of the stack, the pressure detecting device for a fuel cell stack comprising:

a first insulating spacer;

a second insulating spacer;

a conductive element adapted to be electrically connected between the first battery pack and the second battery pack; and

at least one pressure sensor sandwiched between the first insulating spacer and the second insulating spacer.

2. The pressure detecting device for a fuel cell stack according to claim 1, wherein the pressure sensor includes a sensor body, the first insulating spacer has at least one first body limiting groove, and the sensor body is limited in the first body limiting groove.

3. The pressure detecting device for a fuel cell stack according to claim 2, wherein the second insulating partition plate has a receiving groove, and the sensor body corresponds to the receiving groove.

4. The pressure detecting device for a fuel cell stack according to claim 3, comprising a gasket installed between the groove bottom of the accommodating groove and the pressure sensor, the gasket having a strength greater than that of the groove bottom of the accommodating groove.

5. The pressure sensing device for a fuel cell stack according to claim 1, wherein the first insulating separator has first and second opposite surfaces, a first side surface extending between the first and second surfaces, and a first flow guide passage extending between the first and second surfaces or between the second surface and the first side surface.

6. The pressure sensing device for a fuel cell stack according to claim 1, wherein the second insulating separator has third and fourth opposite surfaces, a second side surface extending between the third and fourth surfaces, and a second flow guide passage extending between the third and fourth surfaces or between the fourth and second side surfaces.

7. The pressure sensing device for a fuel cell stack of claim 1, wherein the conductive assembly includes a first conductive member adapted to be electrically connected to the first stack and a second conductive member adapted to be electrically connected to the second stack, the first conductive member being connected to the second conductive member at a side of the cell.

8. The pressure detecting device for a fuel cell stack according to claim 7, wherein the first conductive member includes a first main body portion mounted to the first insulating separator and a first connecting portion extending from the first main body portion to the second insulating separator, and the second conductive member includes a second main body portion mounted to the second insulating separator and a second connecting portion extending from the second main body portion to the first insulating separator, the first connecting portion corresponding to the second connecting portion.

9. The pressure detecting apparatus for a fuel cell stack according to claim 8, wherein the first connecting portion has at least one first fixing hole, and the second connecting portion has at least one second fixing hole corresponding to the first fixing hole.

10. The pressure detection device for a fuel cell stack according to claim 7, wherein the first conductive element is fitted to the first insulating separator, and the second conductive element is fitted to the second insulating separator.

Images