Monopolar plates, single cells and battery stacks

Abstract

The present invention discloses a monopolar plate, a single cell, and a battery stack. The monopolar plate includes a plate body, a gas flow channel, a first cooling flow channel, and a second cooling flow channel. The first cooling flow channel is provided on the plate body, isolated from the gas flow channel, and is used to pass a first coolant. The first cooling flow channel is located in the reaction zone and is used to cool the gas flow channel located in the reaction zone. The second cooling flow channel is provided on the plate body, isolated from the gas flow channel, and is used to pass a second coolant. The second cooling flow channel is located in the second zone and is used to cool the gas flow channel in the second zone. The first cooling flow channel is isolated from the second cooling flow channel. The monopolar plate of the present invention reduces the water vapor content of the exhaust gas in the second zone without affecting the water vapor content in the gas in the reaction zone, thereby facilitating gas discharge.

Description

Technical Field

[0001] The present invention relates to the technical field of battery stacks, and in particular to a monopolar plate, a single cell and a battery stack. Background Art

[0002] Fuel cells are one of the new energy products with development potential. Their working principle is to generate electricity by injecting gas fuel into the battery stack to produce electrochemical reactions.

[0003] A fuel cell stack consists of a membrane electrode assembly (MEA), a cathode plate, and an anode plate. Its main structure is a stack of cathode plate, MEA, and anode plate. Generally, the cathode and anode plates have the same plate structure, differing in that the cathode plate's gas flow channels are filled with air, while the anode plate's gas flow channels are filled with hydrogen. Gas flow channels are located on one side of the plate, and cooling channels are located on the other side.

[0004] To improve the operating efficiency of a fuel cell stack, it's necessary to increase the water vapor content in the gas in the cathode plate's reaction zone. Therefore, the coolant in the reaction zone must be kept at a relatively high temperature. However, in actual operation, this high coolant temperature in the reaction zone results in a high water vapor content in the gas discharged at the cathode plate's gas outlet, hindering subsequent emissions. Summary of the Invention

[0005] The main purpose of the embodiments of the present invention is to provide a monopolar plate, a single cell and a battery stack, aiming to improve the technical problem in the prior art that the water vapor content at the air outlet of the cathode plate is too high due to the high water vapor content in the reaction area of ​​the cathode plate, which is not conducive to emission.

[0006] An embodiment of the present invention provides a monopolar plate, comprising:

[0007] A plate body having a first area, a reaction area, and a second area sequentially distributed along a first direction;

[0008] a gas flow channel disposed on one side of the electrode body, and the gas flow channel sequentially passing through the first zone, the reaction zone, and the second zone along a first direction, with an inlet end of the gas flow channel disposed in the first zone and an outlet end of the gas flow channel disposed in the second zone;

[0009] a first cooling channel, provided on a side of the electrode body facing away from the gas flow channel, isolated from the gas flow channel, for passing a first coolant, the first cooling channel being located in the reaction zone, and for cooling the gas flow channel located in the reaction zone;

[0010] a second cooling channel, provided on a side of the electrode body facing away from the gas channel, the gas channel being isolated and used for passing a second coolant, the second cooling channel being located in the second zone and used together with the second cooling channel to cool the gas channel in the second zone;

[0011] The first cooling channel is isolated from the second cooling channel.

[0012] In some embodiments of the present invention, the first cooling channel is provided at a position corresponding to the position of the gas channel in the reaction zone;

[0013] The second cooling channel is provided at a position corresponding to the position of the gas channel in the second zone.

[0014] In some embodiments of the present invention, one end of the first cooling channel extends into the first zone, and a location of the first cooling channel in the first zone corresponds to a location of the gas channel in the first zone.

[0015] In some embodiments of the present invention, the coverage area of ​​the first cooling channel in the reaction zone is greater than or equal to the coverage area of ​​the gas channel in the reaction zone.

[0016] In some embodiments of the present invention, a coverage area of ​​the first cooling channel in the first zone is greater than or equal to a coverage area of ​​the gas channel in the first zone.

[0017] In some embodiments of the present invention, a coverage area of ​​the second cooling channel in the second region is greater than or equal to a coverage area of ​​the gas channel in the second region.

[0018] In some embodiments of the present invention, the first cooling channel includes at least one first branch channel and at least one second branch channel connected in sequence, the first branch channel is arranged along the first direction, and the second branch channel is arranged along the second direction;

[0019] There is a first angle between the second direction and the first direction, and the first angle is greater than 0° and less than 180°.

[0020] In some embodiments of the present invention, the monopolar plate further comprises:

[0021] a gas inlet, disposed in the first zone, the gas inlet being in communication with a gas inlet end of the gas flow channel;

[0022] a gas outlet, disposed in the second zone, the gas outlet being in communication with a gas outlet end of the gas flow channel;

[0023] a first coolant inlet, disposed in the first zone, the first coolant inlet being in communication with one end of the first cooling channel;

[0024] a first cooling liquid outlet, disposed in the reaction zone, the first cooling liquid outlet being in communication with the other end of the first cooling channel;

[0025] a second coolant inlet, disposed in the second zone, the second coolant inlet being connected to one end of the second cooling channel;

[0026] The second coolant outlet is provided in the second zone, and the second coolant outlet is connected to the other end of the second cooling channel.

[0027] An embodiment of the present invention further provides a single battery, comprising:

[0028] A cathode plate and an anode plate arranged opposite to each other;

[0029] and a membrane electrode disposed between the cathode plate and the anode plate;

[0030] At least one of the cathode plate and the anode plate is the aforementioned monopolar plate.

[0031] An embodiment of the present invention further provides a battery stack, comprising a plurality of the above-mentioned single cells, wherein the plurality of the single cells are stacked.

[0032] Embodiments of the present invention provide a monopolar plate, a single cell, and a battery stack. These utilize a first cooling channel provided in a reaction zone, through which a first coolant is passed, to cool the gas flow channels located within the reaction zone. A second cooling channel provided in a second zone, through which a second coolant is passed, is provided to cool the gas flow channels located within the second zone. By setting the second coolant's entry temperature lower than the first coolant's entry temperature, one skilled in the art can accelerate the condensation of water vapor in gas entering the second zone through the gas flow channels, thereby reducing the water vapor content of the gas exiting the gas flow channel outlets. Gas enters the first zone, passes through the reaction zone, and then exits the second zone. The first cooling channel cools the gas in the reaction zone's gas flow channels, while the second cooling channel cools the gas flow channels in the second zone. Because the temperature of the first coolant in the first cooling channel is higher than the temperature of the second coolant in the second cooling channel, the water vapor content of the gas exiting the second zone can be reduced without affecting the water vapor content of the gas in the gas flow channels within the reaction zone, thereby facilitating gas discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0034] Figure 1 A schematic diagram of the division of the gas inlet and outlet area and the reaction area of ​​the electrode plate body according to an embodiment of the present invention;

[0035] Figure 2 Schematic diagram of the structure of the side of the electrode plate body having the gas flow channel according to the first embodiment of the present invention;

[0036] Figure 3 This is a structural diagram of one side of the electrode plate body having a cooling channel according to the first embodiment of the present invention.

[0037] Description of reference numerals:

[0038] 100, electrode plate body; 201, first zone; 202, reaction zone; 203, second zone; 300, gas flow channel; 301, gas inlet; 302, gas outlet; 400, first cooling channel; 401, first coolant inlet; 402, first coolant outlet; 500, second cooling channel; 501, second coolant inlet; 502, second coolant outlet. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0041] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their 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 such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] like Figure 1-3 As shown, an embodiment of the present invention provides a monopolar plate, comprising a plate body 100, a gas flow channel 300, a first cooling flow channel 400 and a second cooling flow channel 500. The plate body 100 has a first area 201, a reaction area 202 and a second area 203 sequentially distributed along a first direction.

[0044] It should be noted that the electrode plate body 100 generally adopts a rectangular plate body, and the first direction defaults to the length direction of the electrode plate body 100, that is, there are three areas in reverse order along the length of the electrode plate body 100, namely the first area 201 for setting the gas inlet 301 and the second area 203 for setting the gas outlet 302.

[0045] The gas flow channel 300 is disposed on one side of the electrode body 100, with one end of the gas flow channel 300 disposed in the first region 201. The gas flow channel 300 extends from the gas inlet and outlet region along a first direction through the reaction region 202. The gas inlet end of the gas flow channel 300 is disposed in the first region 201, and the gas outlet end of the gas flow channel 300 is disposed in the second region 203.

[0046] Naturally, the gas outlet 302 on the electrode plate body 100 is connected to the gas outlet end of the gas flow channel 300 , and the gas inlet 301 on the electrode plate is connected to the gas inlet end of the gas flow channel 300 .

[0047] That is, in actual use, the gas enters the gas flow channel 300 from the gas inlet 301 of the first zone 201, passes through the gas flow channel 300 portion of the reaction zone 202, and finally flows out from the gas outlet end of the gas flow channel 300 located in the second zone 203.

[0048] It should be noted that the gas flow channel 300 is provided on the surface of the electrode plate body 100. Specifically, the gas flow channel 300 is a groove formed in the surface of the electrode plate body 100. The groove can be formed by directly removing a portion of the plate body in the thickness direction, or by a protrusion and a ridge on the plate surface. The two ends of the groove are located in the first area 201 and the second area 203, respectively, and the middle section of the groove is located in the reaction area 202, so that the gas can react in the reaction area 202.

[0049] The gas flow channel 300 can be used to introduce hydrogen or air according to the polarity of the electrode plate body 100 in the battery stack.

[0050] When air is introduced into the gas flow channel 300 on a certain electrode plate body 100 , the air reacts when flowing through the reaction zone 202 to generate water vapor. At this time, the electrode plate serves as a cathode plate.

[0051] The first cooling channel 400 is provided on the electrode plate body 100 and is isolated from the gas channel 300 on the electrode plate body 100. The first cooling channel 400 is used to pass a first coolant. The first cooling channel 400 is located in the reaction zone 202 and is used to cool the gas channel 300 in the reaction zone 202.

[0052] It is understood that in order to prevent cross-flow between the first coolant and the gas in the gas flow channel 300 and to improve the cooling effect of the first cooling flow channel 400 on the gas flow channel 300, the first cooling flow channel 400 is isolated from the gas flow channel 300. Since the gas flow channel 300 is disposed on the plate surface on one side of the electrode body 100, in order to isolate the first cooling flow channel 400 from the gas flow channel 300, the first cooling flow channel 400 can be disposed on the plate surface on the other side of the electrode body 100, that is, the first cooling flow channel 400 is disposed on the side of the electrode body 100 facing away from the gas flow channel 300.

[0053] It should be noted that the first cooling channel 400 is also a groove formed on the plate surface of the electrode body 100. The groove can also be formed by directly removing a portion of the plate in the thickness direction, or by a protrusion and a ridge of the plate surface.

[0054] The second cooling channel 500 is disposed on the electrode body 100 and is isolated from the gas channel 300 on the electrode body 100. The second cooling channel 500 is used to pass a second coolant. The second cooling channel 500 is located in the second zone 203 and is used to cool the gas channel 300 in the second zone 203.

[0055] The first cooling channel 400 and the second cooling channel 500 are isolated from each other.

[0056] The second cooling channel 500 is specifically arranged close to the first cooling channel 400, that is, the second cooling channel is also arranged on the side of the electrode body 100 away from the gas channel 300, so as to be isolated from the gas channel 300. At the same time, in order to prevent the coolant in the first cooling channel 400 and the second cooling channel 500 from flowing, the first cooling channel 400 and the second cooling channel 500 are isolated.

[0057] It can be understood that since the first cooling channel 400 is used to cool the gas channel 300 in the reaction zone 202, and the second cooling channel 500 is used to cool the cooling channel in the second zone 203, it is used to cool the gas to be discharged from the gas channel 300.

[0058] The second cooling channel 500 primarily cools the portion of the gas flow channel 300 located in the second zone 203 and the gas outlet 302 provided in the second zone 203. The temperature of the first coolant is set higher than that of the second coolant. This allows the coolant at a lower temperature to accelerate the condensation of water vapor in the gas passing through the reaction zone 202 into a liquid state, thereby reducing the water vapor content at the gas outlet 302.

[0059] It should be noted that the above-mentioned monopolar plate can be used as a cathode plate or an anode plate in a battery stack according to the type of gas introduced into the gas flow channel.

[0060] As can be seen from the above description, the present invention provides a unipolar plate, which comprises a first cooling channel 400 in the reaction zone 202, through which a first coolant is passed, for cooling the gas flow channel 300 located in the reaction zone 202. A second cooling channel 500 is provided in the second zone 203, through which a second coolant is passed, for cooling the gas flow channel 300 located in the second zone 203. Those skilled in the art can accelerate the condensation of water vapor in the gas entering the second zone 203 from the gas flow channel 300 by setting the second coolant's entry temperature lower than the first coolant's entry temperature, thereby reducing the water vapor content of the gas exiting the gas flow channel 300. Gas enters the first zone 201, passes through the reaction zone 202, and then exits the second zone 203. The first cooling channel 400 cools the gas in the gas flow channel 300 in the reaction zone 202, while the second cooling channel 500 cools the gas flow channel 300 in the second zone 203. Since the temperature of the first coolant introduced into the first cooling channel 400 is higher than the temperature of the second coolant in the second cooling channel 500, the water vapor content of the exhaust gas in the second zone 203 can be reduced without affecting the water vapor content of the gas in the gas channel 300 in the reaction zone 202, which is beneficial to gas discharge.

[0061] In some possible embodiments, the unipolar plate can be provided with specially shaped gas flow channels 300 so that both the gas outlet 302 and the gas inlet 301 are located in the first zone 201 (or the second zone 203). For example, by providing a U-shaped gas flow channel 300, both ends of the gas flow channel 300 can be located in the first zone 201 (or the second zone 203). In this case, to cool the gas flow channel 300 in the reaction zone 202 and the gas inlet and outlet zone separately, the first cooling channel 400 is completely located in the reaction zone 202, and the second cooling channel 500 is completely located in the first zone 201 or the second zone 203.

[0062] In some possible implementations, there are multiple gas flow channels 300, multiple first cooling flow channels 400, and multiple second cooling flow channels 500. The multiple gas flow channels 300 form a gas flow field. The multiple first cooling flow channels 400 form a first cooling field. The multiple second cooling flow channels 500 form a second cooling field.

[0063] In some possible implementations, the coolant generally selected is water, ethanol, etc. The first coolant and the second coolant may be the same type of coolant or different types of coolants.

[0064] In some embodiments, in order to ensure the cooling effect of the first cooling channel 400 and the second cooling channel 500 on the gas channel 300, the setting position of the first cooling channel 400 corresponds to the position of the gas channel 300 in the reaction zone 202, and the setting position of the second cooling channel 500 corresponds to the position of the gas channel 300 in the second zone 203.

[0065] It should be noted that the first cooling channel 400 is positioned to correspond to the position of the gas channel 300 in the reaction zone 202. That is, the arrangement route of the first cooling channel 400 on the electrode plate body 100 is consistent with the arrangement route of the gas channel 300 in the reaction zone 202. Similarly, the arrangement route of the second cooling channel 500 on the electrode plate body 100 is consistent with the arrangement route of the gas channel 300 in the second zone 203.

[0066] Furthermore, to ensure the cooling effect of the first cooling channel 400 on the gas flow channel 300 in the reaction zone 202, the coverage area of ​​the first cooling channel 400 in the reaction zone 202 is greater than or equal to the coverage area of ​​the gas flow channel 300 in the reaction zone 202. That is, on the same arrangement route, the area occupied by the first cooling channel 400 in the reaction zone 202 of the electrode plate body 100 is equal to the area occupied by the gas flow channel 300 in the reaction zone 202 of the electrode plate body 100.

[0067] It can also be understood that the projection shape of the first cooling channel 400 in the reaction zone 202 in the direction perpendicular to the electrode plate body 100 is the same as the projection shape of the gas channel 300 in the reaction zone 202 in the direction perpendicular to the electrode plate body 100, and the projection area of ​​the first cooling channel 400 in the reaction zone 202 in the direction perpendicular to the electrode plate body 100 is greater than or equal to the projection area of ​​the gas channel 300 in the reaction zone 202 in the direction perpendicular to the electrode plate body 100.

[0068] Furthermore, in order to facilitate the route design of the first cooling channel 400 so as not to conflict with other structures on the electrode body 100 and to improve the cooling efficiency of the first cooling channel 400 on the gas channel 300, one end of the first cooling channel 400 is extended into the first region 201, and the location of the first cooling channel 400 in the first region 201 corresponds to the location of the gas channel 300 in the first region 201.

[0069] That is, the arrangement route of the first cooling channel 400 in the first region 201 on the electrode plate body 100 is consistent with the arrangement route of the gas channel 300 in the first region 201 .

[0070] It is understandable that the first cooling channel 400 is disposed in the first zone 201 , and can cool the gas entering the reaction zone 202 in advance, thereby preventing the temperature in the reaction zone 202 from being too high and damaging the electrode body 100 .

[0071] Specifically, the electrode body 100 is provided with a first coolant inlet 401 and a first coolant outlet 402. The first coolant inlet 401 is provided in the first zone 201, and the first coolant outlet 402 is provided in the reaction zone 202. The first coolant inlet 401 communicates with one end of the first cooling channel 400, and the first coolant outlet 402 communicates with the other end of the first cooling channel 400. The first coolant inlet 401 is provided in the first zone 201 so that a portion of the first cooling channel 400 is provided in the first zone 201, thereby cooling the gas channel 300 provided in the first zone 201. To cool the gas channel 300 in the first zone 201, the first cooling channel 400 is generally provided on the back side of the electrode body 100, facing away from the gas channel 300, and the first cooling channel 400 is provided corresponding to the gas channel 300. That is, in the first zone 201 and the reaction zone 202 , the first cooling channels 400 have the same shape and number as the gas channels 300 , and their positions correspond to each other.

[0072] Furthermore, a first coolant outlet 402 is provided in the reaction zone 202. It is understandable that a gas flow channel 300 is provided in the reaction zone 202, and the gas flow channel 300 constitutes a gas flow field, in which the gas introduced flows. The first cooling flow channel 400 forms a first cooling flow field on the back side of the electrode body 100, thereby cooling the gas flow field. In order to prevent the coolant in the first cooling flow field from affecting the second zone 203, the first coolant outlet 402 can be provided in the reaction zone 202, and the first coolant outlet 402 can be provided at the edge of the reaction zone 202, that is, the first coolant outlet 402 is located outside the first cooling field.

[0073] Furthermore, the coverage area of ​​the first cooling channel 400 in the first zone 201 is greater than or equal to the coverage area of ​​the gas channel 300 in the first zone 201 .

[0074] That is, on the same arrangement route, the area occupied by the first cooling channel 400 in the first region 201 of the electrode plate body 100 is equal to the area occupied by the gas channel 300 in the first region 201 of the electrode plate body 100 .

[0075] It can also be understood that the projection shape of the first cooling channel 400 in the first zone 201 in the direction perpendicular to the electrode body 100 is the same as the projection shape of the gas channel 300 in the first zone 201 in the direction perpendicular to the electrode body 100, and the projection area of ​​the first cooling channel 400 in the first zone 201 in the direction perpendicular to the electrode body 100 is greater than or equal to the projection area of ​​the gas channel 300 in the first zone 201 in the direction perpendicular to the electrode body 100.

[0076] Furthermore, the coverage area of ​​the second cooling channel 500 in the second zone 203 is greater than or equal to the coverage area of ​​the gas channel 300 in the second zone 203 .

[0077] That is, the projection shape of the second cooling channel 500 in the second zone 203 in the direction perpendicular to the electrode body 100 is the same as the projection shape of the gas channel 300 in the second zone 203 in the direction perpendicular to the electrode body 100, and the projection area of ​​the second cooling channel 500 in the second zone 203 in the direction perpendicular to the electrode body 100 is greater than or equal to the projection area of ​​the gas channel 300 in the second zone 203 in the direction perpendicular to the electrode body 100.

[0078] In some embodiments, the electrode body 100 is provided with a gas inlet 301, which is disposed in the first region 201 and communicates with the gas inlet end of the gas flow channel 300. The electrode body 100 is provided with a gas outlet 302, which is disposed in the second region 203 and communicates with the gas outlet end of the gas flow channel 300.

[0079] It should be noted that the gas inlet 301 and the gas outlet 302 need to be connected to the gas channel 300 .

[0080] In addition, since in actual use, the above-mentioned monopolar plates are usually arranged in pairs. That is, in the battery stack, two monopolar plates are docked to form a bipolar plate, and the two monopolar plates have a side of the gas flow channel 300 arranged back to back, and hydrogen is passed through the gas flow channel 300 of one monopolar plate body 100, and air is passed through the gas flow channel 300 of the other monopolar plate body 100. Therefore, it is necessary to provide at least two gas inlets 301 and at least two gas outlets 302 on a single monopolar plate. That is, the gas inlet 301 on the plate body 100 includes a first gas inlet 301 and a second gas inlet 301. The gas outlet 302 on the plate body 100 includes a first gas outlet 302 and a second gas outlet 302. Among them, the first gas inlet 301 is used to communicate with the gas flow channel 300 on its own plate body 100, and to communicate with the second gas inlet 301 on the other plate body 100 paired with it. The second gas inlet 301 is used to connect to the gas flow channel 300 on its own plate body 100 and communicate with the first gas inlet 301 on the other plate body 100. The first gas outlet 302 and the second gas outlet 302 are arranged as described above.

[0081] In some embodiments, the first cooling channel 400 includes at least one first branch channel and at least one second branch channel connected in sequence, the first branch channel is arranged along the first direction, the second branch channel is arranged along the second direction, and there is a first angle between the first direction and the second direction, and the first angle is greater than 0° and less than 180°.

[0082] It should be noted that the aforementioned sequential connection can be: the first first branch channel connects to the first second branch channel, the first second branch channel then connects to the second first branch channel; or the first first branch channel connects to the second first branch channel, the second first branch channel then connects to the first second branch channel, etc. Generally speaking, the number of first branch channels and second branch channels in the first cooling channel 400 is the same.

[0083] In some embodiments, the sum of the number of the first branch channels and the number of the second branch channels in the first cooling channel 400 is no less than 3.

[0084] In some embodiments, the first branch channel and the second branch channel are both straight channels. Since the first direction is the same as the length direction of the electrode body 100, the second branch channel is set at an angle to the first branch channel, so that the first cooling channel 400 is a zigzag channel. The zigzag setting can slow down the flow rate of the coolant relative to a pure straight setting, thereby improving the cooling effect as much as possible and avoiding the temperature of the reaction zone 202 being too high.

[0085] At the same time, since the angle can be controlled, the outlet position of the first cooling channel 400 can be controlled to be located at any position in the reaction zone 202 .

[0086] In some possible embodiments, the first branch flow channel and the second branch flow channel are both linear flow channels, and the angle between the first branch flow channel and the second branch flow channel is 90°. When the angle between the first branch flow channel and the second branch flow channel is 90°, the second direction is the width direction of the electrode body 100.

[0087] In other embodiments, the first branch flow channel may be a straight flow channel, and the second branch flow channel may be a curved flow channel.

[0088] In some other possible implementations, both the first branch flow channel and the second branch flow channel may be curved flow channels.

[0089] In other possible embodiments, the first branch channel (second branch channel) may be a composite channel that combines straight lines and curves. For example, the first half of the first branch channel (second branch channel) is a straight channel, and the second half of the first branch channel (second branch channel) may be a curved channel.

[0090] In some embodiments, a second coolant inlet 501 and a second coolant outlet 502 are provided on the electrode body 100, the second coolant inlet 501 is connected to one end of the second cooling channel 500, and the second coolant outlet 502 is connected to the other end of the second cooling channel 500, and the second coolant inlet 501 and the coolant outlet are both provided in the second zone 203.

[0091] It is understandable that the second cooling channel 500 mainly cools the gas channel 300 disposed in the second zone 203. Therefore, the second cooling channel 500 needs to correspond to the position of the gas channel 300.

[0092] In some possible implementations, the second cooling channel 500 is also a curved channel. It is understandable that the curved channel can slow down the flow rate of the coolant as much as possible so as to fully cool the gas channel 300 in the second zone 203 .

[0093] In some possible embodiments, a portion of the gas flow channel 300 is disposed in the second zone 203 where the gas outlet 302 is located, and the second cooling channel 500 is disposed on the other side of the electrode body 100, and the second cooling channel 500 is disposed to surround the portion of the gas flow channel 300 in the second zone 203, and to enable the second coolant in the second cooling channel 500 to absorb heat from the gas flow channel 300, thereby reducing the water vapor content in the gas flowing out of the gas outlet 302.

[0094] In some possible embodiments, the second cooling channel 500 is arranged inside the electrode body 100, and the second cooling channel 500 is arranged around the gas outlet 302. The annular cooling area formed by the second cooling channel 500 surrounds the gas channel 300 located in the gas inlet and outlet area, so that the second coolant in the second cooling channel 500 can absorb heat from the gas channel 300.

[0095] In some embodiments, the first cooling channel 400 is disposed within the electrode plate body 100. Specifically, by opening a channel within the electrode plate body 100 to form the first cooling channel 400, when two unipolar plates are connected to form a bipolar plate, the bipolar plate has two first cooling channels 400, cooling each plate separately, thereby improving the cooling efficiency of the plate. Accordingly, in order to allow for the opening of the first cooling channel 400 within the electrode plate body 100, the electrode plate body 100 itself needs to have a certain thickness.

[0096] In some embodiments, the first cooling channel 400 is arranged on the side of the electrode plate body 100 away from the gas channel 300, that is, the first cooling channel 400 is arranged on the surface of the electrode plate body 100. When two unipolar plates are connected to form a bipolar plate, the first cooling channels 400 of the two unipolar plates are docked and matched to form a cooling channel.

[0097] Those skilled in the art can implement the second cooling channel 500 by the same means according to the above description. Therefore, detailed description is omitted here.

[0098] In some embodiments, the bipolar plate is composed of a first unipolar plate and a second unipolar plate. Both the first and second unipolar plates utilize the aforementioned unipolar plates and have the same specifications. The first and second unipolar plates are disposed opposite and connected to each other, with the side of the first unipolar plate having the gas flow channel 300 facing away from the second unipolar plate, and the side of the second unipolar plate having the gas flow channel 300 facing away from the first unipolar plate.

[0099] It should be noted that since the specifications of the first unipolar plate and the second unipolar plate are the same, when the first unipolar plate is docked with the second unipolar plate, the first area 201, reaction area 202, and second area 203 on the first unipolar plate correspond one-to-one with the first area 201, reaction area 202, and second area 203 on the second unipolar plate.

[0100] When the first and second unipolar plates form a bipolar plate, hydrogen is introduced into the gas flow channel 300 on the first unipolar plate, while air is introduced into the gas flow channel 300 on the second unipolar plate. That is, the gas inlet on the first unipolar plate is a hydrogen inlet; the gas outlet 302 on the first unipolar plate is a hydrogen outlet; and the gas flow channel 300 on the first unipolar plate is a hydrogen flow channel. The gas inlet on the second cell plate is an air inlet, the gas outlet 302 on the second unipolar plate is an air outlet, and the gas flow channel 300 on the second unipolar plate is an air flow channel.

[0101] At the same time, according to the aforementioned two unipolar plates, when they are butted together, the first cooling channels 400 (the second cooling channels 500 ) are combined or exist separately inside the unipolar plates.

[0102] When the first cooling channels 400 (second cooling channels 500) on the two unipolar plates are merged, the two first cooling channels 400 (second cooling channels 500) are docked together to form a new cooling channel, which is located between the first unipolar plate and the second unipolar plate, that is, the newly formed cooling channel is located inside the bipolar plate.

[0103] Similarly, when the first unipolar plate is docked with the second unipolar plate, the first coolant inlet 401 (first coolant outlet 402) on the first unipolar plate and the first coolant inlet (first coolant outlet 402) on the second unipolar plate merge to form a new coolant inlet (coolant outlet).

[0104] With reference to the above description, those skilled in the art may make the same settings on the second coolant inlet 501 and the second coolant outlet 502 .

[0105] Since the bipolar plate in this embodiment adopts part or all of the technical solutions of the above-mentioned monopolar plate, the bipolar plate in this embodiment has at least part or all of the beneficial effects of the above-mentioned monopolar plate, which will not be described in detail here.

[0106] The present invention also provides a single cell comprising a cathode plate and an anode plate arranged opposite to each other, and a membrane electrode arranged between the cathode plate and the anode plate, wherein at least one of the cathode plate and the anode plate is the above-mentioned monopolar plate.

[0107] Since the above-mentioned single cell adopts the technical solution of the above-mentioned monopolar plate, it has at least some or all of the beneficial effects of the above-mentioned embodiments, which will not be described in detail here.

[0108] The present invention also provides a battery stack, comprising a plurality of the above-mentioned single cells, wherein the plurality of single cells are stacked.

[0109] The structure of a single cell can be regarded as a stacked structure formed by a first electrode plate, a membrane electrode assembly, and a second electrode plate.

[0110] The first electrode plate and the second electrode plate are both the above-mentioned monopolar plates, and the monopolar plate specifications used by the first electrode plate and the second electrode plate are the same. That is, the first electrode plate and the second electrode plate are consistent.

[0111] When the cells are stacked, the structure formed by the two cells is: first electrode plate - membrane electrode assembly - second electrode plate - first electrode plate - membrane electrode assembly - second electrode plate. When the first and second electrode plates are stacked, the coordination of the structures on the first and second electrode plates is similar to the coordination of the two unipolar plates in a bipolar plate.

[0112] Since the battery stack uses the above-mentioned monopolar plate as the first electrode plate and the second electrode plate, the battery stack has at least some or all of the beneficial effects of the above-mentioned monopolar plate, which will not be described in detail here.

[0113] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's description and drawings, or direct / indirect applications in other related technical fields within the application concept of the present invention are included in the patent protection scope of the present invention.

Claims

1. A monopolar plate, characterized in that: include: A plate body having a first area, a reaction area, and a second area sequentially distributed along a first direction; a gas flow channel disposed on one side of the electrode body, and the gas flow channel sequentially passing through the first zone, the reaction zone, and the second zone along a first direction, with an inlet end of the gas flow channel disposed in the first zone and an outlet end of the gas flow channel disposed in the second zone; a first cooling channel, disposed on a side of the electrode body facing away from the gas flow channel, isolated from the gas flow channel, for passing a first coolant, the first cooling channel being located in the reaction zone, for cooling the gas flow channel in the reaction zone, and the first cooling channel being located at a position corresponding to the position of the gas flow channel in the reaction zone; a second cooling channel, disposed on a side of the electrode body facing away from the gas channel, the gas channel being isolated and configured to carry a second coolant, the second cooling channel being located in the second zone and configured to cool the gas channel in the second zone, the second cooling channel being located at a position corresponding to the position of the gas channel in the second zone; The first cooling channel is isolated from the second cooling channel, and the temperature of the first coolant flowing into the first cooling channel is higher than the temperature of the second coolant flowing into the second cooling channel.

2. The monopolar plate according to claim 1, characterized in that One end of the first cooling channel extends into the first zone, and a setting position of the first cooling channel in the first zone corresponds to a setting position of the gas channel in the first zone.

3. The monopolar plate according to claim 2, characterized in that: The coverage area of ​​the first cooling channel in the reaction zone is greater than or equal to the coverage area of ​​the gas channel in the reaction zone.

4. The monopolar plate according to claim 3, characterized in that: The coverage area of ​​the first cooling channel in the first zone is greater than or equal to the coverage area of ​​the gas channel in the first zone.

5. The monopolar plate according to claim 1, characterized in that: The coverage area of ​​the second cooling channel in the second zone is greater than or equal to the coverage area of ​​the gas channel in the second zone.

6. The monopolar plate according to claim 1, characterized in that: The first cooling channel includes at least one first branch channel and at least one second branch channel connected in sequence, the first branch channel is arranged along the first direction, and the second branch channel is arranged along the second direction; There is a first angle between the second direction and the first direction, and the first angle is greater than 0° and less than 180°.

7. The monopolar plate according to claim 2, characterized in that: The monopolar plate further comprises: a gas inlet, disposed in the first zone, the gas inlet being in communication with a gas inlet end of the gas flow channel; a gas outlet, disposed in the second zone, the gas outlet being in communication with a gas outlet end of the gas flow channel; a first coolant inlet, disposed in the first zone, the first coolant inlet being in communication with one end of the first cooling channel; a first cooling liquid outlet, disposed in the reaction zone, the first cooling liquid outlet being in communication with the other end of the first cooling channel; a second coolant inlet, disposed in the second zone, the second coolant inlet being connected to one end of the second cooling channel; The second coolant outlet is provided in the second zone, and the second coolant outlet is connected to the other end of the second cooling channel.

8. A single cell battery, characterized in that: include: cathode plates and anode plates arranged opposite to each other; and a membrane electrode disposed between the cathode plate and the anode plate; At least one of the cathode plate and the anode plate is the monopolar plate according to any one of claims 1 to 7.

9. A battery stack, characterized in that: The method comprises a plurality of unit batteries as claimed in claim 8, wherein the plurality of unit batteries are stacked.

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