Bipolar plate, bipolar plate design method and system, storage medium and fuel cell

Abstract

The invention provides a bipolar plate, a bipolar plate design method, a bipolar plate design system, a storage medium and a fuel cell, and relates to the technical field of fuel cells, the bipolar plate design method provided by the invention comprises the following steps: extending a diversion region towards the edge of a gap bridge region along a design line, and arranging a plurality of diversion runners in the diversion region at intervals along the design line, a function curve of mass flow and pressure drop value deviation is determined by simulating and detecting the mass flow and the pressure drop value of the middle section of each flow channel in the reaction area, and a function curve of a design line is determined according to the function curve of the mass flow and pressure drop value deviation, so that the length of each flow guide flow channel in the flow guide area can be reasonably designed; and the reasonable distance between the edge of the gap bridge region and the edge of the diversion region is set, so that the gas distribution uniformity can be improved, the stability of the galvanic pile performance is further improved, the flow resistance of the diversion region can be reduced, the gas flowing efficiency is improved, and the system power consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a bipolar plate, a bipolar plate design method, a system, a storage medium and a fuel cell. Background Art

[0002] The traditional bipolar plate flow guide area structure usually has technical problems such as uneven distribution of hydrogen or oxygen, which causes uneven electrochemical reactions, easily leading to insufficient gas supply in some flow channels, difficulty in discharging water generated in some flow channels, and uneven thermal field of the bipolar plate, which seriously affects the performance and life of the battery stack.

[0003] In order to overcome the problems faced by the conventional bipolar plate flow guide area structure, grooves are usually set in the flow guide area and extended to the air inlet, which easily causes gas turbulence near the air inlet, and still causes the problem of uneven gas distribution. Moreover, when optimizing the uniformity of gas distribution, the gas flow resistance is usually increased, thereby affecting the gas flow efficiency, which makes it difficult to balance uniformity and gas flow efficiency. Summary of the invention

[0004] The object of the present invention is to provide a bipolar plate, a bipolar plate design method, a system, a storage medium and a fuel cell to alleviate the technical problems of poor gas distribution uniformity and low gas flow efficiency of the bipolar plate in the prior art.

[0005] In a first aspect, the present invention provides a bipolar plate design method, wherein the bipolar plate has a bridge area, a guide area, and a reaction area that are sequentially fluidically connected, the guide area extends along a design line toward an edge of the bridge area, and a plurality of guide channels in the guide area are spaced apart along the design line;

[0006] The bipolar plate design method includes the following steps:

[0007] Simulate and detect the mass flow rate and pressure drop values ​​in the middle section of each flow channel in the reaction zone, and determine the function curve of the deviation of the mass flow rate and the pressure drop value;

[0008] The function curve of the design line is determined based on the function curve of the mass flow rate and the pressure drop numerical deviation.

[0009] In combination with the first aspect, the present invention provides a first possible implementation manner of the first aspect, wherein the step of determining the function curve of the design line according to the function curve of the mass flow rate and the pressure drop numerical deviation comprises:

[0010] If the function curve of the deviation of the mass flow rate and the pressure drop value is a linear function, the function curve of the design line is solved by iterative calculation according to the linear function curve;

[0011] If the function curve of the mass flow rate and the pressure drop numerical deviation is a quadratic function, the function curve of the design line is solved according to the n-th order function curve, where n ≥ 2, and the design line bulges toward the bridge area.

[0012] In combination with the first possible implementation of the first aspect, the present invention provides a second possible implementation of the first aspect, wherein the step of iteratively calculating and solving the function curve of the design line according to the linear function curve includes:

[0013] According to the function y=ax+b, the slope value a is gradually reduced to iteratively solve the function curve of the design line, wherein the initial value of the slope value a is 1-2, and b is a constant.

[0014] In a second aspect, the bipolar plate design system provided by the present invention comprises:

[0015] A simulation module is used to simulate and detect the mass flow rate and pressure drop values ​​in the middle section of each flow channel in the reaction zone, and determine the function curve of the deviation of the mass flow rate and the pressure drop value;

[0016] A processing module, used for determining a function curve of a design line according to a function curve of a mass flow rate and a pressure drop numerical deviation;

[0017] The interactive module is used to output the calculation results of the function curve of the design line.

[0018] In a third aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the bipolar plate design method described in the first aspect.

[0019] In a fourth aspect, the bipolar plate provided by the present invention has a manifold area, a bridge area, a flow guide area and a reaction area which are fluidically connected in sequence;

[0020] The diversion area extends along the design line toward the edge of the bridge area, and a plurality of diversion channels in the diversion area are arranged at intervals along the design line;

[0021] The function curve of the design line is configured as a linear function or an n-order function, where n≥2.

[0022] In combination with the fourth aspect, the present invention provides a first possible implementation of the fourth aspect, wherein the design line and the guide area together form a triangular area.

[0023] In combination with the fourth aspect, the present invention provides a second possible implementation of the fourth aspect, wherein the design line is spaced apart from the bridge area, and the design line protrudes toward the bridge area.

[0024] In combination with the fourth aspect, the present invention provides a third possible implementation of the fourth aspect, wherein a manifold area, a bridge area and a guide area are respectively provided at both ends of the reaction zone;

[0025] On the unfolded surface of the bipolar plate, the manifold area, the bridge area and the guide area located at both ends of the reaction zone are symmetrical with respect to the center of the midpoint of the perpendicular bisector of the reaction zone.

[0026] In a fifth aspect, the fuel cell provided by the present invention includes the bipolar plate described in the fourth aspect.

[0027] The embodiments of the present invention bring about the following beneficial effects: the edge of the guide area is extended toward the bridge area along the design line, and the multiple guide channels in the guide area are arranged at intervals along the design line, and the function curve of the mass flow rate and the pressure drop value deviation is determined by simulating and detecting the mass flow rate and the pressure drop value in the middle section of each channel in the reaction zone, and the function curve of the design line is determined according to the function curve of the mass flow rate and the pressure drop value deviation. The length of each guide channel in the guide area can be reasonably designed, and a reasonable distance between the bridge area and the edge of the guide area can be set, which can improve the uniformity of gas distribution, thereby improving the stability of the fuel cell performance, and can reduce the flow resistance of the guide area, improve the gas flow efficiency, and reduce the system power consumption.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of a first bipolar plate provided in an embodiment of the present invention;

[0031] Figure 2 A partially enlarged schematic diagram of a first bipolar plate provided in an embodiment of the present invention;

[0032] Figure 3 A schematic diagram of a second bipolar plate provided by an embodiment of the present invention;

[0033] Figure 4 A partially enlarged schematic diagram of a second bipolar plate provided in an embodiment of the present invention.

[0034] Icon: 100 - manifold area; 200 - bridge area; 300 - diversion area; 400 - reaction area. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Physical quantities in formulas, if not separately marked, should be understood as basic quantities of the base units of the International System of Units, or derived quantities derived from the basic quantities through mathematical operations such as multiplication, division, differentiation or integration.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] like Figure 1 and Figure 3 As shown, the bipolar plate design method provided by an embodiment of the present invention comprises a bipolar plate having a bridge area 200, a guide area 300 and a reaction area 400 which are fluidically connected in sequence, the guide area 300 extends along a design line toward the edge of the bridge area 200, and a plurality of guide channels in the guide area 300 are arranged at intervals along the design line.

[0039] The bipolar plate design method includes the following steps: simulating and detecting the mass flow and pressure drop values ​​of the middle section of each flow channel in the reaction zone 400, and determining the function curve of the mass flow and pressure drop value deviation; determining the function curve of the design line according to the function curve of the mass flow and pressure drop value deviation.

[0040] When designing the bipolar plate, simulation and detection are performed based on the mass flow rate and pressure drop values ​​of the middle section of each flow channel in the reaction zone 400, thereby determining the function curve of the deviation of the mass flow rate and the pressure drop value, and then determining the function curve of the design line based on the function curve of the deviation of the mass flow rate and the pressure drop value. The length of each flow channel in the flow guide area 300 can be reasonably designed, and a reasonable spacing between the bridge area 200 and the edge of the flow guide area 300 can be set, which can improve the uniformity of gas distribution, thereby improving the stability of the stack performance, and can reduce the flow resistance of the flow guide area 300, improve gas flow efficiency, and reduce system power consumption.

[0041] In an embodiment of the present invention, the step of determining the function curve of the design line according to the function curve of the mass flow rate and the pressure drop value deviation includes:

[0042] See also Figure 3 and Figure 4 , if the function curve of the mass flow rate and the pressure drop numerical deviation is a linear function, the function curve of the design line is solved by iterative calculation according to the linear function curve;

[0043] See also Figure 1 and Figure 2 If the function curve of the mass flow rate and the pressure drop numerical deviation is a quadratic function, the function curve of the design line is solved according to the n-th function curve, where n≥2, and the design line bulges toward the bridge area 200.

[0044] like Figure 3 and Figure 4 As shown, the step of iteratively calculating and solving the function curve of the design line according to the linear function curve includes: iteratively solving the function curve of the design line according to the function y=ax+b, gradually reducing the slope value a, wherein the initial value of the slope value a is 1-2, and b is a constant. At this time, the spacing area between the design line and the bridge area 200 is triangular, and the distance between the bridge area 200 and the guide area 300 is more reasonable, which helps to reduce turbulence and thus improve the uniformity of gas distribution.

[0045] like Figure 1 and Figure 3 As shown, the bipolar plate design system provided by the embodiment of the present invention includes: a simulation module, which is used to simulate and detect the mass flow rate and pressure drop values ​​in the middle section of each flow channel in the reaction zone 400, and determine the function curve of the mass flow rate and the pressure drop value deviation; a processing module, which is used to determine the function curve of the design line according to the function curve of the mass flow rate and the pressure drop value deviation; an interactive module, which is used to output the calculation result of the function curve of the design line.

[0046] In an embodiment of the present invention, the bipolar plate design system can execute the bipolar plate design method recorded in the above-mentioned implementation mode. The simulation module can use finite element simulation software such as Ansys Fluent, StarCCM+, Comsol, etc. to obtain the mass flow and pressure drop values ​​of the middle section of each flow channel in the reaction zone 400. The digital model of the preset bipolar plate is input through the interactive module, and the function curve of the design line is solved by determining the function curve of the deviation of the mass flow and the pressure drop value, thereby realizing the automatic design of the bipolar plate and improving the design efficiency.

[0047] The computer-readable storage medium provided in the embodiment of the present invention stores a computer program thereon, and when the computer program is executed by a processor, the bipolar plate design method as described in the above embodiment is implemented.

[0048] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the bipolar plate provided by the embodiment of the present invention has a manifold area 100, a bridge area 200, a guide area 300 and a reaction area 400 which are sequentially fluidically connected; the guide area 300 extends along the design line toward the edge of the bridge area 200, and a plurality of guide channels in the guide area 300 are arranged at intervals along the design line; the function curve of the design line is configured as a linear function or an n-order function, wherein n≥2. The bipolar plate realizes a reasonable design of the guide area 300, can ensure that the length distribution of each channel in the guide area 300 is appropriate, and can take into account both improving the uniformity of gas distribution and reducing gas flow resistance.

[0049] like Figure 3 and Figure 4 As shown, the design line and the guide area 300 together form a triangular area. The inlet end of the flow channel of the guide area 300 is distributed along the design line. The length distribution of each flow channel in the triangular area can reduce the gas flow resistance, improve the gas flow efficiency, and thus reduce the system power consumption.

[0050] like Figure 1 and Figure 2 As shown, the design line is spaced apart from the bridge area 200, and the design line bulges toward the bridge area 200. When the function curve of the mass flow rate and the pressure drop value deviation is a quadratic function, the design line is more suitable for being configured as an arc line, and the arc line bulges toward the bridge area 200.

[0051] like Figure 1 and Figure 3As shown, a manifold area 100, a bridge area 200 and a guide area 300 are respectively provided at both ends of the reaction zone 400; on the unfolded surface of the bipolar plate, the manifold area 100, the bridge area 200 and the guide area 300 located at both ends of the reaction zone 400 are respectively symmetrical with respect to the center of the midpoint of the perpendicular bisector of the reaction zone 400, thereby ensuring better uniformity of gas distribution in each channel in the reaction zone 400, which is beneficial to improving the stability of the electrochemical performance.

[0052] The fuel cell provided in the embodiment of the present invention includes the bipolar plate described in the above embodiment. The fuel cell has the technical effects of the above bipolar plate, which will not be described in detail here.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for designing a bipolar plate, wherein the bipolar plate has a bridge area, a guide area and a reaction area which are fluidically connected in sequence, wherein the guide area extends along a design line toward an edge of the bridge area, and a plurality of guide channels in the guide area are arranged at intervals along the design line; It is characterized in that The bipolar plate design method comprises the following steps: Simulating and detecting the mass flow rate and pressure drop value of the middle section of each flow channel in the reaction zone, and determining the function curve of the deviation between the mass flow rate and the pressure drop value; The function curve of the design line is determined according to the function curve of the mass flow rate and the pressure drop value deviation.

2. The bipolar plate design method according to claim 1, characterized in that: The step of determining the function curve of the design line according to the function curve of the mass flow rate and the pressure drop numerical deviation comprises: If the function curve of the mass flow rate and the pressure drop value deviation is a linear function, the function curve of the design line is solved by iterative calculation according to the linear function curve; If the function curve of the mass flow rate and the pressure drop numerical deviation is a quadratic function, the function curve of the design line is solved according to the nth-order function curve, wherein n≥2, and the design line protrudes toward the bridge area.

3. The bipolar plate design method according to claim 2, characterized in that: The step of iteratively calculating and solving the function curve of the design line according to the linear function curve comprises: According to the function y=ax+b, the slope value a is gradually reduced to iteratively solve the function curve of the design line, wherein the initial value of the slope value a is 1-2, and b is a constant.

4. A bipolar plate design system, characterized in that: include: A simulation module, used to simulate and detect the mass flow rate and pressure drop value of the middle section of each flow channel in the reaction zone, and determine the function curve of the deviation between the mass flow rate and the pressure drop value; A processing module, used for determining a function curve of a design line according to a function curve of a deviation between the mass flow rate and the pressure drop value; The interactive module is used to output the calculation result of the function curve of the design line.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the bipolar plate design method according to any one of claims 1 to 3 is implemented.

6. A bipolar plate, characterized in that: The bipolar plate has a manifold area, a bridge area, a flow guide area and a reaction area which are fluidically connected in sequence; The flow guide area extends along a design line toward the edge of the bridge area, and a plurality of flow guide channels in the flow guide area are arranged at intervals along the design line; The function curve of the design line is configured as a linear function or an n-order function, wherein n≥2.

7. The bipolar plate according to claim 6, characterized in that: The design line and the guide area together form a triangular area.

8. The bipolar plate according to claim 6, characterized in that: The design line is spaced apart from the bridge area, and the design line protrudes toward the bridge area.

9. The bipolar plate according to any one of claims 6 to 8, characterized in that: The manifold area, the bridge area and the guide area are respectively provided at two ends of the reaction area; On the unfolded surface of the bipolar plate, the manifold area, the bridge area and the guide area located at both ends of the reaction area are respectively symmetrical with respect to the center of the midpoint of the perpendicular bisector of the reaction area.

10. A fuel cell, characterized in that: The fuel cell comprises the bipolar plate according to any one of claims 6 to 9.

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