Collector plate, fuel cell and fuel cell internal temperature detection method

Abstract

The invention provides a collector plate, a fuel cell and a method for detecting the internal temperature of the fuel cell, the collector plate comprises a collector plate body and a plurality of temperature sensors, the end surface of the collector plate body, which is used for connecting a polar plate, is provided with a mounting groove, and the temperature sensors are arranged in the mounting groove. According to the collector plate, the temperature sensors are arranged on the end face, used for being connected with the polar plate, of the collector plate body so as to obtain the heat of the polar plate when the fuel cell runs, the distribution condition of the internal temperature of the fuel cell is further obtained through the multiple temperature sensors, and meanwhile, the end face of the collector plate body is provided with the installation grooves used for installing the temperature sensors; and the temperature sensor is arranged in the mounting groove to ensure the connection sealing performance of the collector plate body and the polar plate, so that the air tightness of the fuel cell is ensured.

Description

Technical Field

[0001] The present invention relates to the field of fuel cells, and in particular to a current collecting plate, a fuel cell and a method for detecting the internal temperature of a fuel cell. Background Art

[0002] A fuel cell is a device that converts chemical energy into electrical energy through an electrochemical reaction between hydrogen and oxygen. A fuel cell generates a large amount of heat during operation. Uneven heat dissipation in the fuel cell will cause uneven temperature in the fuel cell, which will affect the performance and life of the fuel cell and even create safety hazards. Therefore, it is necessary to obtain the temperature conditions in the fuel cell during the research and development and testing of the fuel cell so as to adjust the heat dissipation structure. In the related art, a temperature sensor is set on the plate to obtain the temperature. However, it is difficult to produce a temperature sensor on the plate. At the same time, setting a temperature sensor on each structure of the plate for testing will result in high costs and a long test phase. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a current collecting plate having a temperature detection function.

[0004] An embodiment of the present invention further provides a fuel cell having the current collecting plate of the above embodiment.

[0005] The embodiment of the present invention further provides a method for detecting the internal temperature of a fuel cell.

[0006] The current collecting plate of the embodiment of the present invention comprises:

[0007] A current collecting plate body, wherein the end surface of the current collecting plate body for connecting to the pole plate is provided with a mounting groove;

[0008] A temperature sensor is arranged in the installation groove, and there are multiple temperature sensors.

[0009] The current collector of the embodiment of the present invention has a temperature sensor disposed on the end surface of the current collector body for connecting to the electrode plate to obtain the heat of the electrode plate when the fuel cell is running, and further obtains the distribution of the internal temperature of the fuel cell through multiple temperature sensors. At the same time, the end surface of the current collector body is provided with a mounting groove for installing the temperature sensor, and the temperature sensor is disposed in the mounting groove to ensure the sealing of the connection between the current collector body and the electrode plate, thereby ensuring the airtightness of the fuel cell.

[0010] In some embodiments, the installation groove is in a grid shape, and a plurality of the temperature sensors are detachably bonded in the installation groove.

[0011] In some embodiments, the current collecting plate also includes an electric wire, and a threading channel is provided on the side wall of the current collecting plate body, the threading channel extends to the side of the mounting groove and is connected to the mounting groove, one end of the electric wire is arranged in the mounting groove and is connected to the temperature sensor, and the other end of the electric wire extends out of the current collecting plate body through the threading channel for connecting to a temperature collector.

[0012] In some embodiments, the mounting groove includes a plurality of first groove bodies, the first groove bodies are in the shape of strips extending along the width direction of the current collecting plate body, and the plurality of first groove bodies are arranged at intervals along the length direction of the current collecting plate body.

[0013] In some embodiments, the mounting groove includes a plurality of second groove bodies, the second groove bodies are in the shape of strips extending along the length direction of the current collecting plate body, and the plurality of second groove bodies are arranged at intervals along the width direction of the current collecting plate body.

[0014] In some embodiments, a threading channel is provided on the side wall surface of the current collecting plate body, and the threading channel extends to the groove side surface of the most adjacent second groove body and is connected with the most adjacent second groove body.

[0015] In some embodiments, the electrode plate is provided with a flow channel, and the electrode plate includes an inlet distribution area, an active reaction area and an outlet distribution area arranged in sequence along the flow direction of the medium in the flow channel, and the number of temperature sensors arranged in the area where the current collecting plate body is relatively set to the outlet distribution area is greater than the number of temperature sensors arranged in the area where the current collecting plate body is relatively set to the inlet distribution area.

[0016] In some embodiments, the active reaction zone includes an inlet mainstream zone and an outlet mainstream zone sequentially arranged along the flow direction of the medium in the flow channel, the number of temperature sensors set in the area where the current collecting plate body is relatively set to the inlet mainstream zone is greater than or equal to the number of temperature sensors set in the area where the current collecting plate body is relatively set to the inlet distribution zone, the number of temperature sensors set in the area where the current collecting plate body is relatively set to the outlet mainstream zone is greater than the number of temperature sensors set in the area where the current collecting plate body is relatively set to the outlet distribution zone, and is greater than the number of temperature sensors set in the area where the current collecting plate body is relatively set to the inlet mainstream zone.

[0017] The fuel cell of the embodiment of the present invention comprises:

[0018] a first end plate;

[0019] A second end plate, the second end plate is arranged side by side with the first end plate and spaced apart;

[0020] a bipolar plate and a membrane electrode assembly, wherein the bipolar plate and the membrane electrode assembly are disposed between the first end plate and the second end plate;

[0021] A current collecting plate, wherein the current collecting plate is the current collecting plate described in any one of the above embodiments, the current collecting plate is arranged between the first end plate and the second end plate, there are at least two current collecting plates, and the bipolar plate and the membrane electrode assembly are arranged between each two adjacent current collecting plates;

[0022] A temperature collector is electrically connected to the temperature sensor.

[0023] The fuel cell according to the embodiment of the present invention has the current collecting plate according to the embodiment of the present invention, so that the distribution of the internal temperature of the fuel cell can be obtained through the current collecting plate.

[0024] The method for detecting the internal temperature of a fuel cell according to an embodiment of the present invention comprises:

[0025] Determine the position of the temperature sensor on the current collecting plate body according to the flow channel of the electrode plate, and install the temperature sensor in the installation groove on the end surface of the current collecting plate body;

[0026] Stacking and packaging fuel cells;

[0027] Performing air tightness testing on the fuel cell, and when the air tightness of the fuel cell is qualified, electrically connecting the temperature sensor to the temperature collector;

[0028] Supplying cooling water of known temperature to the fuel cell, and calibrating the temperature sensor according to the temperature displayed by the temperature collector;

[0029] The fuel cell is operated, and the internal temperature of the fuel cell is acquired through the temperature sensor and the temperature collector.

[0030] The fuel cell internal temperature detection method of the embodiment of the present invention can obtain the internal temperature distribution of the fuel cell through the temperature sensor on the collector plate body. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of a current collecting plate according to an embodiment of the present invention;

[0032] Figure 2 yes Figure 1 Side view of the middle header plate;

[0033] Figure 3 Schematic diagram of an explosion of a fuel cell according to an embodiment of the present invention.

[0034] Reference numerals:

[0035] 10. Current collecting plate; 1. Current collecting plate body; 2. Mounting slot; 21. First slot body; 22. Second slot body; 3. Temperature sensor; 4. Electric wire; 5. Threading channel;

[0036] 20. First end plate; 30. Second end plate; 40. Bipolar plate and membrane electrode assembly; 50. Temperature collector. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0038] Reference below Figure 1-Figure 3 A current collecting plate, a fuel cell and a method for detecting the internal temperature of a fuel cell according to an embodiment of the present invention are described.

[0039] like Figure 1 and Figure 2 As shown, the current collecting plate 10 according to the embodiment of the present invention includes a current collecting plate body 1 and a temperature sensor 3 .

[0040] The end surface of the current collecting plate body 1 for connecting the pole plate is provided with a mounting groove 2. A temperature sensor 3 is arranged in the mounting groove 2, and there are multiple temperature sensors 3.

[0041] Specifically, Figure 1 As shown, the current collector body 1 is used to be stacked and packaged into a fuel cell, and at least one end surface of the current collector body 1 along its thickness direction is used to connect the electrode plate. In other words, the current collector body 1 can be connected to the electrode plate at one end along its thickness direction, or can be connected to corresponding electrode plates at both ends along its thickness direction.

[0042] The end surface of the current collecting plate body 1 for connecting the pole plate is provided with a mounting groove 2 and a plurality of temperature sensors 3. The mounting groove 2 can be set to be one with a larger area, and the plurality of temperature sensors 3 are all arranged in the mounting groove 2. The mounting groove 2 can also be set to be multiple, and the plurality of temperature sensors 3 can be distributed in all the plurality of mounting grooves 2, or in part of the mounting grooves 2, and only one temperature sensor 3 is arranged in the mounting groove 2 provided with the temperature sensor 3.

[0043] By arranging multiple temperature sensors 3 at different positions in the mounting groove 2, or arranging multiple temperature sensors 3 in the mounting grooves 2 at different positions, the multiple temperature sensors 3 are distributed at different positions on the end surface of the collector plate body 1, so as to obtain the temperatures at different positions of the connected plates after the collector plates 10 are stacked and packaged into a fuel cell, thereby obtaining the distribution of the internal temperature of the fuel cell.

[0044] The temperature sensor 3 is preferably a T-type ultra-fine Teflon thermocouple.

[0045] The current collector of the embodiment of the present invention has a temperature sensor disposed on the end surface of the current collector body for connecting to the electrode plate to obtain the heat of the electrode plate when the fuel cell is running, and further obtains the distribution of the internal temperature of the fuel cell through multiple temperature sensors. At the same time, the end surface of the current collector body is provided with a mounting groove for installing the temperature sensor, and the temperature sensor is disposed in the mounting groove to ensure the sealing of the connection between the current collector body and the electrode plate, thereby ensuring the airtightness of the fuel cell.

[0046] The current collecting plate according to the embodiment of the present invention has at least two purposes.

[0047] The first use is as a test device for the plate. The current collector and the plate are stacked and packaged as a fuel cell. During the operation of the fuel cell, the distribution of the internal temperature of the fuel cell is obtained through multiple temperature sensors of the current collector, and the heat dissipation structure of the plate is judged to be qualified according to the distribution of the internal temperature of the fuel cell, and the design of the heat dissipation structure is adjusted accordingly if it is unqualified. For example, if the temperature of a certain area of ​​the fuel cell is abnormally high, it can be considered to adjust the setting position and parameters of the cooling water flow channel in the corresponding area of ​​the plate, or adjust the relative position between the cooling water flow channel and the gas flow channel in the corresponding area of ​​the plate, and test the adjusted plate again. In the first use, since multiple temperature sensors are arranged in the mounting groove of the current collector body, it is not necessary to process each plate to be tested to install the temperature sensor. The plate to be tested and the current collector can be stacked and packaged as a fuel cell, thereby reducing the cost and time of the plate testing process. At the same time, the production difficulty of the current collector is relatively low, which also reduces the production difficulty and cost of the test equipment.

[0048] The second use is to monitor the fuel cell. During the operation of the fuel cell, multiple temperature sensors acquire and monitor the distribution of the internal temperature of the fuel cell in real time. When the distribution of the internal temperature of the fuel cell is abnormal, for example, the temperature of a certain area inside the fuel cell is abnormally high, the terminal device electrically connected to the multiple temperature sensors sends an alarm signal to remind the user, and can further control the fuel cell to stop running to avoid safety hazards.

[0049] In some embodiments, the installation groove 2 is in a grid shape, and a plurality of temperature sensors 3 are detachably bonded in the installation groove 2 .

[0050] like Figure 1 As shown, the mounting groove 2 is in a grid shape, and a plurality of temperature sensors 3 are arranged in the grid-shaped mounting groove 2. The temperature sensor 3 can be arranged at any position in the mounting groove 2. The grid-shaped mounting groove 2 provides a larger range of installable positions for the temperature sensor 3.

[0051] The temperature sensor 3 is detachably bonded in the mounting groove 2, so as to facilitate the disassembly and assembly of the temperature sensor 3 and the adjustment of the mounting position of the temperature sensor 3. The temperature sensor 3 can be bonded in the mounting groove 2 by double-sided adhesive tape or adhesive tape.

[0052] It is understandable that the mounting grooves are not limited to being in a grid shape. In other embodiments, the mounting grooves are circular to fit the temperature sensor 3 , and a plurality of mounting grooves are evenly distributed on the end surface of the current collecting plate body.

[0053] In some embodiments, the current collecting plate 10 of the embodiment of the present invention also includes an electric wire 4, and a threading channel 5 is provided on the side wall of the current collecting plate body 1, and the threading channel 5 extends to the side of the mounting groove 2 and is connected to the mounting groove 2. One end of the electric wire 4 is arranged in the mounting groove 2 and is connected to the temperature sensor 3, and the other end of the electric wire 4 extends to the outside of the current collecting plate body 1 through the threading channel 5 for connecting to the temperature collector 50.

[0054] like Figure 1 and Figure 2 As shown, the temperature sensor 3 has a detection end and a connection end, the connection end is connected to the wire 4, and the wire 4 is used to connect the temperature collector 50 to transmit the temperature information obtained by the temperature sensor 3 to the temperature collector 50. Preferably, the temperature collector 50 is connected to all the temperature sensors 3 through the wire 4 to obtain the temperature information transmitted by all the temperature sensors 3, and can store, analyze and display all the temperature information.

[0055] The current collecting plate body 1 is arranged along the width direction (such as Figure 1 At least one side wall surface (in the front-to-back direction as shown) is provided with a threading channel 5, the threading channel 5 extends into the collector plate body 1 along the front-to-back direction, and extends to the grid-like mounting groove 2 and the groove side surface most adjacent to it, so that the threading channel 5 is connected with the mounting groove 2, and the threading channel 5 can be set to one, or it can be set to a plurality of channels arranged at intervals along the left-right direction.

[0056] One end of the wire 4 is connected to the temperature sensor 3 in the mounting groove 2, and the other end extends out of the collector body 1 through the threading channel 5 and is connected to the temperature collector 50. Preferably, the wire 4 is detachably bonded to the mounting groove 2. Only one wire 4 may be provided and connected to all temperature sensors 3, or multiple wires may be provided and connected to the temperature sensors 3 in a one-to-one correspondence, or multiple wires may be provided and each wire 4 is connected to a corresponding part of the temperature sensors 3.

[0057] The threading channel 5 is set to extend from the side wall of the current collector body 1 to the groove side of the installation groove 2 to ensure the airtightness of the current collector 10 and the electrode after connection, thereby ensuring the airtightness of the fuel cell. The installation groove 2 is set in a grid shape to facilitate the installation of the wire 4.

[0058] It can be understood that when there are multiple installation slots, each installation slot is provided with a corresponding connected threading channel.

[0059] It is understandable that the temperature sensor is not limited to being connected to the temperature collector via wires. In other embodiments, the temperature sensor is connected to the temperature collector via wireless signals, and in this case, the installation groove may not be arranged in a grid shape.

[0060] In some embodiments, the mounting groove 2 includes a plurality of first groove bodies 21, and the first groove bodies 21 are arranged along the width direction of the current collecting plate body 1 (eg Figure 1 The plurality of first slots 21 extend in the longitudinal direction of the current collecting plate body 1 (as shown in the front and rear direction). Figure 1 The left and right directions as shown) are arranged at intervals.

[0061] In some embodiments, the mounting groove 2 includes a plurality of second groove bodies 22 , the second groove bodies 22 are strip-shaped and extend along the length direction of the current collecting plate body 1 , and the plurality of second groove bodies 22 are arranged at intervals along the width direction of the current collecting plate body 1 .

[0062] like Figure 1 As shown, the mounting groove 2 includes a plurality of first groove bodies 21 and a plurality of second groove bodies 22. The first groove bodies 21 extend in the front-to-back direction, and the plurality of first groove bodies 21 are arranged at intervals in the left-to-right direction. The second groove bodies 22 extend in the left-to-right direction, and the plurality of second groove bodies 22 are arranged at intervals in the front-to-back direction. The plurality of first groove bodies 21 are cross-connected with the plurality of second groove bodies 22 to form a grid shape.

[0063] The temperature sensor 3 can be arranged at the connection between the first trough body 21 and the second trough body 22, or at the part of the first trough body 21 between the two connection points, or at the part between the end of the first trough body 21 and the nearest connection point, or at the part of the second trough body 22 between the two connection points, or at the part between the end of the second trough body 22 and the nearest connection point.

[0064] It is understandable that the structure of the grid-shaped installation groove is not limited to Figure 1 In the structure shown, in other embodiments, the groove body of the mounting groove extends along the front-to-back direction and is inclined along the left-to-right direction.

[0065] It is understandable that the mounting slot is not limited to a grid shape. In other embodiments, the mounting slot includes a plurality of first slot bodies, and the temperature sensors are arranged in different first slot bodies to detect the temperature of different regions in the left-right direction, and the temperature sensors are arranged at different positions of the first slot bodies to detect the temperature of different regions in the front-back direction. Alternatively, the mounting slot includes a plurality of second slot bodies, and the temperature sensors are arranged in different second slot bodies to detect the temperature of different regions in the front-back direction, and the temperature sensors are arranged at different positions of the second slot bodies to detect the temperature of different regions in the left-right direction.

[0066] In some embodiments, a threading channel 5 is provided on the side wall of the current collecting plate body 1 . The threading channel 5 extends to the groove side surface of the most adjacent second groove body 22 and is communicated with the most adjacent second groove body 22 .

[0067] like Figure 1 As shown, a threading channel 5 is provided on the side wall of the collector body 1 at the front side, and the threading channel 5 extends along the front-to-back direction to the groove side of the second groove body 22 at the front end, and is connected with the second groove body 22, thereby connecting with the grid-shaped installation groove 2.

[0068] In some embodiments, the electrode plate is provided with a flow channel, and the electrode plate includes an inlet distribution area, an active reaction area and an outlet distribution area arranged in sequence along the flow direction of the medium in the flow channel, and the number of temperature sensors 3 set in the area where the current collecting plate body 1 is relatively set to the outlet distribution area is greater than the number of temperature sensors 3 set in the area where the current collecting plate body 1 is relatively set to the inlet distribution area.

[0069] Specifically, the electrode plate includes an anode plate and a cathode plate. Both ends of the anode plate along the thickness direction are provided with flow channels extending in the left-right direction, the flow channel at one end is used for hydrogen flow, and the flow channel at the other end is used for cooling water flow. Both ends of the cathode plate along the thickness direction are provided with flow channels extending in the left-right direction, the flow channel at one end is used for oxygen or air flow, and the flow channel at the other end is used for cooling water flow.

[0070] The left ends of the electrode plate and the current collector body 1 are provided with correspondingly connected hydrogen inlets, cooling water inlets and oxygen or air inlets, and the right ends are provided with correspondingly connected hydrogen outlets, cooling water outlets and oxygen or air outlets. The hydrogen flow channel is connected between the hydrogen inlet and the hydrogen outlet, the cooling water flow channel is connected between the cooling water inlet and the cooling water outlet, and the oxygen or air flow channel is connected between the oxygen or air inlet and the oxygen or air outlet. The mounting groove 2 is located between the hydrogen inlet, cooling water inlet and oxygen or air inlet at the left end of the current collector body 1 and the hydrogen outlet, cooling water outlet and oxygen or air outlet at the right end.

[0071] The electrode plate is provided with an inlet flow distribution area, an active reaction area and an outlet flow distribution area which are arranged in sequence from left to right, and the inlet flow distribution area, the active reaction area and the outlet flow distribution area are all located between the hydrogen inlet, the cooling water inlet and the oxygen or air inlet at the left end of the electrode plate and the hydrogen outlet, the cooling water outlet and the oxygen or air outlet at the right end. Therefore, the inlet flow distribution area, the active reaction area and the outlet flow distribution area are arranged opposite to the mounting groove 2.

[0072] The number of temperature sensors 3 set in the area where the collecting plate body 1 is relatively set to the outlet distribution area is greater than the number of temperature sensors 3 set in the area where the collecting plate body 1 is relatively set to the inlet distribution area. Since the temperature of the outlet distribution area is higher than that of the inlet distribution area, it is more likely to produce abnormally high temperatures in some areas. Therefore, more temperature sensors 3 are set in the area corresponding to the outlet distribution area to ensure that the detection area can cover the outlet distribution area.

[0073] Preferably, 2 to 5 temperature sensors 3 are provided in the area where the collector plate body 1 is opposite to the inlet distribution area, and 3 to 6 temperature sensors 3 are provided in the area where the collector plate body 1 is opposite to the outlet distribution area to ensure the accuracy of obtaining the temperature distribution.

[0074] In some embodiments, the active reaction zone includes an inlet mainstream zone and an outlet mainstream zone arranged in sequence along the flow direction of the medium in the flow channel, the number of temperature sensors 3 set in the area where the current collecting plate body 1 is relatively set to the inlet mainstream zone is greater than or equal to the number of temperature sensors 3 set in the area where the current collecting plate body 1 is relatively set to the inlet distribution zone, the number of temperature sensors 3 set in the area where the current collecting plate body 1 is relatively set to the outlet mainstream zone is greater than the number of temperature sensors 3 set in the area where the current collecting plate body 1 is relatively set to the outlet distribution zone, and is greater than the number of temperature sensors 3 set in the area where the current collecting plate body 1 is relatively set to the inlet mainstream zone.

[0075] Specifically, the active reaction area includes an inlet mainstream area and an outlet mainstream area arranged in sequence from left to right. The number of temperature sensors 3 arranged in the area where the collector plate body 1 is arranged relative to the inlet mainstream area can be greater than the number of temperature sensors 3 arranged in the area where the collector plate body 1 is arranged relative to the inlet distribution area, or can be consistent with the number of temperature sensors 3 arranged in the area where the collector plate body 1 is arranged relative to the inlet distribution area. The number of temperature sensors 3 arranged in the area where the collector plate body 1 is arranged relative to the outlet mainstream area is greater than the number of temperature sensors 3 arranged in the area where the collector plate body 1 is arranged relative to the outlet distribution area, and the number of temperature sensors 3 arranged in the area where the collector plate body 1 is arranged relative to the outlet mainstream area is greater than the number of temperature sensors 3 arranged in the area where the collector plate body 1 is arranged relative to the inlet mainstream area. Since the relative temperature of the outlet mainstream area is higher and the area is larger than the outlet distribution area, it is easier to produce abnormally high temperatures in some areas. Therefore, the maximum number of temperature sensors 3 is set in the outlet mainstream area to ensure that the detection area can cover the outlet distribution area.

[0076] Preferably, 2 to 5 temperature sensors 3 are provided in the area where the collector plate body 1 is arranged opposite to the inlet mainstream area, and 10 to 16 temperature sensors 3 are provided in the area where the collector plate body 1 is arranged opposite to the outlet mainstream area, so as to ensure the accuracy of obtaining the temperature distribution.

[0077] Furthermore, when the end face of the temperature sensor 3 is connected to the anode plate, the temperature sensor 3 is arranged opposite to the hydrogen flow channel, in other words, the projection of the temperature sensor 3 on the anode plate is located in the hydrogen flow channel. When the end face of the temperature sensor 3 is connected to the cathode plate, the temperature sensor 3 is arranged opposite to the hydrogen or air flow channel, in other words, the projection of the temperature sensor 3 on the cathode plate is located in the hydrogen or air flow channel. This ensures the accuracy of obtaining the temperature distribution.

[0078] like Figure 1-Figure 3 As shown, the fuel cell according to the embodiment of the present invention includes a first end plate 20 , a second end plate 30 , a bipolar plate and a membrane electrode assembly 40 , a current collecting plate 10 , and a temperature collector 50 .

[0079] The second end plate 30 is arranged side by side with the first end plate 20 and spaced apart. The bipolar plate and the membrane electrode assembly 40 are arranged between the first end plate 20 and the second end plate 30. The current collecting plate 10 is the current collecting plate 10 of the embodiment of the present invention, and the current collecting plate 10 is arranged between the first end plate 20 and the second end plate 30. There are at least two current collecting plates 10, and a bipolar plate and a membrane electrode assembly 40 are arranged between each two adjacent current collecting plates 10. The temperature collector 50 is electrically connected to the temperature sensor 3.

[0080] Specifically, the second end plate 30 and the first end plate 20 are arranged side by side and at intervals, and a plurality of stacked bipolar plates and membrane electrode assemblies 40 and at least two current collecting plates 10 are provided between the second end plate 30 and the first end plate 20. Each bipolar plate and membrane electrode assembly 40 is provided between two corresponding adjacent current collecting plates 10, and only one bipolar plate and membrane electrode assembly 40 is provided between two adjacent current collecting plates 10. Therefore, one current collecting plate 10 is stacked on the second end plate 30 toward one end of the first end plate 20, and another current collecting plate 10 is stacked on the first end plate 20 toward one end of the second end plate 30.

[0081] An installation groove 2 and a plurality of temperature sensors 3 are provided on the end surface of the current collecting plate body 1 connected to the bipolar plate and the membrane electrode assembly 40 to obtain the temperature distribution of the corresponding bipolar plate and the membrane electrode assembly 40. All temperature sensors 3 of all current collecting plates 10 are connected to the same temperature collector 50 through wires 4 respectively, and the distribution of the internal temperature of the fuel cell is obtained through multiple current collecting plates 10.

[0082] The fuel cell according to the embodiment of the present invention has the current collecting plate according to the embodiment of the present invention, so that the distribution of the internal temperature of the fuel cell can be obtained through the current collecting plate.

[0083] Furthermore, at least three current collecting plates 10 are arranged side by side and at intervals. Except for the current collecting plates 10 located at both ends, both ends of the remaining current collecting plates 10 along the thickness direction are provided with mounting grooves 2 and temperature sensors 3.

[0084] Preferably, three current collecting plates 10 are provided, and two bipolar plates and membrane electrode assemblies 40 are provided. The fuel cell comprises a first end plate 20, a first current collecting plate 10, a first bipolar plate and membrane electrode assembly 40, a second current collecting plate 10, a second bipolar plate and membrane electrode assembly 40, a third current collecting plate 10 and a second end plate 30 which are stacked in sequence.

[0085] The end surface of the first current collecting plate 10 facing the first bipolar plate and the membrane electrode assembly 40 is provided with a mounting groove 2 and a plurality of temperature sensors 3, the end surface of the third current collecting plate 10 facing the second bipolar plate and the membrane electrode assembly 40 is provided with a mounting groove 2 and a plurality of temperature sensors 3, and the second current collecting plate 10 is provided with mounting grooves 2 and a plurality of temperature sensors 3 on both end surfaces along its thickness direction.

[0086] Furthermore, the fuel cell further includes an insulating plate. An insulating plate is provided between the first end plate 20 and the first current collecting plate 10 , and another insulating plate is provided between the second end plate 30 and the third current collecting plate 10 .

[0087] like Figure 1-Figure 3 As shown, the method for detecting the internal temperature of a fuel cell according to an embodiment of the present invention includes the following steps.

[0088] The position of the temperature sensor 3 on the current collecting plate body 1 is determined according to the flow channel of the electrode plate, and the temperature sensor 3 is arranged in the mounting groove 2 on the end surface of the current collecting plate body 1 .

[0089] Specifically, temperature sensors 3 are set according to the inlet distribution area, the active reaction area and the outlet distribution area. Further, temperature sensors 3 are set according to the inlet distribution area, the inlet mainstream area, the outlet mainstream area and the outlet distribution area. Preferably, 2 to 5 temperature sensors 3 are set in the area where the collector plate body 1 is relatively set to the inlet distribution area, 3 to 6 temperature sensors 3 are set in the area where the collector plate body 1 is relatively set to the outlet distribution area, 2 to 5 temperature sensors 3 are set in the area where the collector plate body 1 is relatively set to the inlet mainstream area, and 10 to 16 temperature sensors 3 are set in the area where the collector plate body 1 is relatively set to the outlet mainstream area, and the temperature sensors 3 are bonded to the mounting groove 2.

[0090] Stacking and packaging fuel cells.

[0091] Specifically, the first end plate 20, the second end plate 30, a plurality of bipolar plates and a membrane electrode assembly 40, and at least two current collecting plates 10 are stacked and packaged into a fuel cell. Further, the first end plate 20, the second end plate 30, a plurality of bipolar plates and a membrane electrode assembly 40, at least two current collecting plates 10, and an insulating plate are stacked and packaged into a fuel cell.

[0092] The fuel cell is tested for air tightness, and when the fuel cell is found to be air tight, the temperature sensor 3 is electrically connected to the temperature collector 50 .

[0093] Specifically, the fuel cell is tested for air tightness. If the air tightness is unqualified, the fuel cell is stacked and packaged again. If the air tightness is qualified, all the temperature sensors 3 are connected to the temperature collector 50 through the wires 4.

[0094] Cooling water of known temperature is supplied to the fuel cell, and the temperature sensor 3 is calibrated according to the temperature displayed by the temperature collector 50 .

[0095] Specifically, the fuel cell is in an offline state, in other words, the fuel cell is in a stopped state. Cooling water of known temperature is continuously supplied to the fuel cell, preferably at 60°C, and the cooling water flows through the cooling water inlet, cooling water channel and cooling water outlet in sequence, and then discharged from the fuel cell, and cooling water flows through each bipolar plate and membrane electrode assembly 40. The temperature obtained by each temperature sensor 3 is collected by the temperature collector 50 and compared with the temperature of the cooling water. At the same time, the temperature sensor 3 with abnormal temperature is adjusted or replaced to ensure that the accuracy of the temperature sensor is ±0.2°C.

[0096] The fuel cell is operated, and the internal temperature of the fuel cell is acquired through the temperature sensor 3 and the temperature collector 50 .

[0097] Specifically, cooling water, hydrogen, and air or oxygen are supplied to the fuel cell, and the fuel cell starts to operate. During the operation of the fuel cell, the temperature sensor 3 obtains the temperature in real time, and transmits the obtained temperature to the temperature collector 50 through the wire 4. The temperature collector 50 receives all the temperatures obtained by the temperature sensor 3, and can store, analyze and display all the temperature information to obtain the distribution of the internal temperature of the fuel cell.

[0098] Therefore, the fuel cell internal temperature detection method of the embodiment of the present invention can obtain the distribution of the internal temperature of the fuel cell through the temperature sensor on the collector plate body.

[0099] In the description of the present invention, it is necessary to understand that the terms "length", "width", "thickness", "front", "back", "left", "right", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0100] In addition, the terms "first" and "second" are only used for distinction, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0101] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0102] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0103] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0104] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A current collecting plate, characterized in that: include: A current collecting plate body (1), wherein a mounting groove (2) is provided on the end surface of the current collecting plate body (1) for connecting to the electrode plate; A temperature sensor (3), wherein the temperature sensor (3) is arranged in the installation groove (2), and there are a plurality of the temperature sensors (3).

2. The current collecting plate according to claim 1, characterized in that: The installation groove (2) is in a grid shape, and a plurality of the temperature sensors (3) are detachably bonded in the installation groove (2).

3. The current collecting plate according to claim 1, characterized in that: It also includes an electric wire (4), and a wire threading channel (5) is provided on the side wall surface of the current collecting plate body (1), and the wire threading channel (5) extends to the groove side of the mounting groove (2) and is connected to the mounting groove (2). One end of the electric wire (4) is arranged in the mounting groove (2) and is connected to the temperature sensor (3), and the other end of the electric wire (4) extends out of the current collecting plate body (1) through the wire threading channel (5) to be used for connecting to a temperature collector (50).

4. The current collecting plate according to claim 1, characterized in that: The mounting groove (2) comprises a plurality of first groove bodies (21), wherein the first groove bodies (21) are in the shape of strips extending along the width direction of the current collecting plate body (1), and the plurality of first groove bodies (21) are arranged at intervals along the length direction of the current collecting plate body (1).

5. The current collecting plate according to claim 1 or 4, characterized in that: The mounting groove (2) comprises a plurality of second groove bodies (22), wherein the second groove bodies (22) are in the shape of strips extending along the length direction of the current collecting plate body (1), and the plurality of second groove bodies (22) are arranged at intervals along the width direction of the current collecting plate body (1).

6. The current collecting plate according to claim 5, characterized in that: A threading channel (5) is provided on the side wall surface of the current collecting plate body (1), and the threading channel (5) extends to the groove side surface of the most adjacent second groove body (22) and is in communication with the most adjacent second groove body (22).

7. The current collecting plate according to claim 1, characterized in that: The electrode plate is provided with a flow channel, and the electrode plate comprises an inlet flow distribution area, an active reaction area and an outlet flow distribution area which are arranged in sequence along the flow direction of the medium in the flow channel, and the number of the temperature sensors (3) arranged in the area where the current collecting plate body (1) is arranged opposite to the outlet flow distribution area is greater than the number of the temperature sensors (3) arranged in the area where the current collecting plate body (1) is arranged opposite to the inlet flow distribution area.

8. The current collecting plate according to claim 7, characterized in that: The active reaction zone comprises an inlet mainstream zone and an outlet mainstream zone arranged in sequence along the flow direction of the medium in the flow channel; the number of the temperature sensors (3) arranged in the area where the current collecting plate body (1) is arranged opposite to the inlet mainstream zone is greater than or equal to the number of the temperature sensors (3) arranged in the area where the current collecting plate body (1) is arranged opposite to the inlet flow distribution zone; the number of the temperature sensors (3) arranged in the area where the current collecting plate body (1) is arranged opposite to the outlet mainstream zone is greater than the number of the temperature sensors (3) arranged in the area where the current collecting plate body (1) is arranged opposite to the outlet flow distribution zone, and is greater than the number of the temperature sensors (3) arranged in the area where the current collecting plate body (1) is arranged opposite to the inlet mainstream zone.

9. A fuel cell, characterized in that: include: A first end plate (20); A second end plate (30), the second end plate (30) and the first end plate (20) are arranged side by side and at an interval; A bipolar plate and a membrane electrode assembly (40), wherein the bipolar plate and the membrane electrode assembly (40) are arranged between the first end plate (20) and the second end plate (30); A current collecting plate (10), the current collecting plate (10) being the current collecting plate according to any one of claims 1 to 8, the current collecting plate (10) being arranged between the first end plate (20) and the second end plate (30), there being at least two current collecting plates (10), and the bipolar plate and the membrane electrode assembly (40) being arranged between each two adjacent current collecting plates (10); A temperature collector (50), wherein the temperature collector (50) is electrically connected to the temperature sensor (3).

10. A method for detecting the internal temperature of a fuel cell, characterized in that: include: Determining the position of the temperature sensor (3) on the current collecting plate body (1) according to the flow channel of the electrode plate, and arranging the temperature sensor (3) in the mounting groove (2) on the end surface of the current collecting plate body (1); Stacking and packaging fuel cells; Performing an airtightness test on the fuel cell, and when the airtightness of the fuel cell is qualified, electrically connecting the temperature sensor (3) to the temperature collector (50); Supplying cooling water of known temperature to the fuel cell, and calibrating the temperature sensor (3) according to the temperature displayed by the temperature collector (50); The fuel cell is operated, and the internal temperature of the fuel cell is acquired through the temperature sensor (3) and the temperature collector (50).

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