Battery plate

Abstract

The invention provides a battery plate. The battery pole plate comprises a flow channel part, wherein the flow channel part is encircled to form a flow channel for fluid circulation; the flow channel comprises at least two variable flow sections and at least one advection section, the at least two variable flow sections are arranged at intervals in the extending direction of the flow channel part, and the advection section is arranged between every two adjacent variable flow sections; the advection section is used for being attached to a membrane electrode of the battery, and at least part of the variable flow section is used for being spaced from the membrane electrode; and the cross sectional area of the variable flow section is gradually changed in the extending direction of the flow channel part. According to the technical scheme provided by the invention, the technical problem that the flowing speed of a medium in a battery pole plate runner in the prior art is relatively low can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery plates, and in particular to a battery plate. Background Art

[0002] At present, bipolar plates have many important functions, such as collecting and conducting current, supporting membrane electrodes, uniformly transporting and isolating reaction gases, circulating coolant, and rapidly dissipating heat, which restrict the performance and durability of fuel cells. The transmission characteristics of the cooling medium and the reaction medium in the bipolar plate flow field have an important impact on the performance and durability of fuel cells.

[0003] However, the existing bipolar plate flow channels usually increase the flow rate of the medium by setting a protrusion in the flow channel, but such a setting actually creates resistance to the flow of the medium in the fuel cell, thereby affecting the flow rate of the medium in the flow channel, and further affecting the discharge of the liquid generated by the reaction in the flow field, thereby increasing the concentration polarization of the fuel cell. Summary of the invention

[0004] The main purpose of the present invention is to provide a battery plate to solve the technical problem of slow flow speed of the medium in the flow channel of the battery plate in the prior art.

[0005] In order to achieve the above object, the present invention provides a battery plate, comprising:

[0006] A flow channel portion, the flow channel portion enclosing a flow channel for allowing a fluid to flow;

[0007] The flow channel comprises at least two flow conversion sections and at least one flow leveling section, wherein the at least two flow conversion sections are arranged at intervals along the extension direction of the flow channel portion, and a flow leveling section is arranged between two adjacent flow conversion sections; the flow leveling section is used to be arranged in contact with the membrane electrode of the battery, and at least part of the flow conversion section is used to be arranged at intervals from the membrane electrode;

[0008] Wherein, along the extension direction of the flow channel portion, the cross-sectional area of ​​the flow-changing section is gradually arranged.

[0009] Furthermore, along the extension direction of the flow channel portion, the height and width of the flow changing section are both gradually arranged.

[0010] Furthermore, along the extension direction of the flow channel portion, the height of the flow-changing section first gradually decreases and then gradually increases; or,

[0011] Along the extension direction of the flow channel portion, the width of the flow-changing section first gradually decreases and then gradually increases.

[0012] Further, the height of the minimum cross section of the variable flow section is H1, the height of the maximum cross section of the variable flow section is H2, 1.5≤H2 / H1≤2.5; and / or,

[0013] The width of the minimum cross section of the variable flow section is W1, the width of the maximum cross section of the variable flow section is W2, and 3≤W2 / W1≤5.

[0014] Furthermore, the flow-changing section comprises a first side portion, a bottom portion and a second side portion connected in sequence, and the first side portion and the second side portion are arranged opposite to each other;

[0015] Wherein, the first side portion and the second side portion are both arranged obliquely.

[0016] Further, along the extension direction of the flow channel portion, the inclination angle of the first side portion relative to the bottom portion first gradually increases and then gradually decreases; and / or,

[0017] Along the extension direction of the flow channel portion, the inclination angle of the second side portion relative to the bottom portion first gradually increases and then gradually decreases; and / or,

[0018] At the minimum cross-section of the variable flow section, the angle between the first side portion and the second side portion is a; at the maximum cross-section of the variable flow section, the angle between the first side portion and the second side portion is b; 1.5≤a / b≤2.

[0019] Furthermore, the current conversion section includes:

[0020] A slowly changing portion and a suddenly changing portion, wherein one end of the slowly changing portion is connected to one end of the flat flow section, and the other end of the slowly changing portion is connected to one end of the suddenly changing portion;

[0021] Wherein, along the extension direction of the flow channel portion, the changing rate of the cross-sectional area of ​​the gradually changing portion is smaller than the changing rate of the cross-sectional area of ​​the suddenly changing portion.

[0022] Furthermore, there are two gradual change portions, and the sudden change portion is located between the two gradual change portions; along the extension direction of the flow channel portion, the length of the sudden change portion is L1, the length of the flow change section is L2, and the height of the maximum cross section of the flow change section is H2;

[0023] Among them, 10≤L1 / H2≤15; and / or, 1.5≤L2 / L1≤2.5.

[0024] Furthermore, there are multiple flow channel portions, and the multiple flow channel portions are arranged at intervals along a preset direction;

[0025] Wherein, along the extension direction of the flow channel portion, the flow changing sections of two adjacent flow channel portions are staggered.

[0026] Furthermore, along the extension direction of the flow channel portion, the interval between the flow-changing sections of two adjacent flow channel portions is L3, the length of the flow-changing section is L2, and L3 / L2>1.5.

[0027] By applying the technical solution of the present invention, the cross-sectional area of ​​the variable flow section can be gradually changed to achieve dynamic adjustment of the flow rate while keeping the overall flow constant, and the change of the flow rate in the flow channel can promote the turbulence of the fluid, thereby accelerating the discharge of the water generated by the reaction in the flow field, improving the system's ability to manage water and heat, and at the same time, it can promote the reaction medium to be guided to the three-phase junction of the battery to improve the system's fuel efficiency and performance. In addition, the combination of the variable flow section and the flat flow section can keep the opening rate of the battery plate within a suitable range. Too low an opening rate will cause the path of the reaction gas entering the membrane electrode to be too long, increase the mass transfer resistance, and increase the pressure drop; too high an opening rate will reduce the contact area between the plate and the membrane electrode, resulting in an increase in contact resistance. In this embodiment, such a setting can further ensure the contact area between the flow channel and the membrane electrode under the premise of promoting the flow of the fluid in the flow channel, and avoid the high opening rate affecting the full reaction of the reaction medium. Therefore, the technical problem of the slow flow rate of the medium in the flow channel of the battery plate in the prior art can be solved by the technical solution of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 A schematic structural diagram of a current conversion section of a battery plate provided in an embodiment of the present invention is shown;

[0030] Figure 2 A partial top view of a flow channel portion of a battery plate provided according to an embodiment of the present invention is shown;

[0031] Figure 3 A side view of a current conversion section of a battery plate provided according to an embodiment of the present invention is shown;

[0032] Figure 4 A partial structural schematic diagram of a flat flow section of a battery plate provided according to an embodiment of the present invention is shown;

[0033] Figure 5 A top view of a local structure of a flat flow section of a battery plate provided in accordance with an embodiment of the present invention is shown;

[0034] Figure 6 A side view of an advection section of a battery plate provided according to an embodiment of the present invention is shown;

[0035] Figure 7 A schematic structural diagram showing a partial structure of a battery plate provided according to an embodiment of the present invention;

[0036] Figure 8 Shows Figure 7 A schematic diagram of the structure enlargement at the center A;

[0037] Fig. 9 A top view of a local structure of a battery plate provided according to an embodiment of the present invention is shown;

[0038] Fig.10 A cross-sectional view of a battery plate provided according to an embodiment of the present invention is shown;

[0039] Fig.11 Shows Fig.10 A schematic diagram of the structure enlarged at B in the middle;

[0040] Fig.12 A schematic diagram of a medium flow path of a battery plate provided in an embodiment of the present invention is shown;

[0041] Fig.13 A schematic diagram showing flow rates in various flow channels of a battery plate in the prior art is shown;

[0042] Fig.14 A schematic diagram of flow velocity in each flow channel of a battery plate provided according to an embodiment of the present invention is shown.

[0043] The above drawings include the following reference numerals:

[0044] 1. Battery plates;

[0045] 10. Runner section;

[0046] 11. Runner;

[0047] 12. Current conversion section;

[0048] 121, first side portion;

[0049] 122, bottom;

[0050] 123, second side portion;

[0051] 124, slowly changing part;

[0052] 125. Mutation Department;

[0053] 13. Horizontal section. DETAILED DESCRIPTION

[0054] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0055] like Figures 1 to 14As shown, an embodiment of the present invention provides a battery plate 1, which includes a flow channel portion 10, and the flow channel portion 10 encloses a flow channel 11 for fluid circulation. The flow channel 11 includes at least two variable flow segments 12 and at least one flat flow segment 13, at least two variable flow segments 12 are arranged at intervals along the extension direction of the flow channel portion 10, and a flat flow segment 13 is arranged between two adjacent variable flow segments 12; the flat flow segment 13 is used to be arranged in contact with the membrane electrode of the battery, and at least part of the variable flow segment 12 is used to be arranged at intervals with the membrane electrode. Among them, along the extension direction of the flow channel portion 10, the cross-sectional area of ​​the variable flow segment 12 is arranged in a gradual manner.

[0056] By using the battery plate 1 provided in the embodiment of the present invention, the cross-sectional area of ​​the variable flow section 12 can be gradually changed to achieve dynamic adjustment of the flow rate while keeping the overall flow rate constant, and the change of the flow rate in the flow channel can promote the turbulence of the fluid, thereby accelerating the discharge of water generated by the reaction in the flow field, improving the system's ability to manage water and heat, and at the same time, it can promote the reaction medium to be guided to the three-phase junction of the battery to improve the system's fuel efficiency and performance. In addition, the combination of the variable flow section 12 and the flat flow section 13 can keep the opening rate of the battery plate 1 within a suitable range. Too low an opening rate will cause the path of the reaction gas entering the membrane electrode to be too long, increase the mass transfer resistance, and increase the pressure drop; too high an opening rate will reduce the contact area between the plate and the membrane electrode, resulting in an increase in contact resistance. In this embodiment, such a setting can further ensure the contact area between the flow channel portion 10 and the membrane electrode under the premise of promoting the flow of the fluid in the flow channel 11, and avoid the high opening rate affecting the full reaction of the reaction medium. Therefore, the battery plate provided in this embodiment can solve the technical problem of the slow flow rate of the medium in the battery plate flow channel in the prior art.

[0057] Specifically, the battery plate 1 in this embodiment is a bipolar plate. The battery is a fuel cell.

[0058] It should be noted that the "three-phase junction" refers to the location where gas molecules (hydrogen or oxygen) meet the solid electrode and electrolyte.

[0059] Specifically, the cross-sectional area of ​​the flat flow section 13 at each location along the extension direction of the flow channel portion 10 is equal. With such a structural arrangement, the fluid can flow in a stable state, which is conducive to maintaining the overall operating efficiency and stability of the fuel cell. At the same time, it can also cooperate with the variable flow section 12 to achieve dynamic adjustment of the flow rate.

[0060] Specifically, the flow conversion section 12 is a symmetrical structure. With such a setting, the symmetrical design can ensure the uniform distribution of the fluid in the flow conversion section 12, reduce the turbulence and eddy current of the fluid when entering and leaving the flow conversion section 12, thereby reducing the fluid resistance and energy loss, and improving the flow efficiency of the fluid.

[0061] Specifically, Figure 1 and Figure 3 As shown, along the extension direction of the flow channel portion 10, the height and width of the variable flow section 12 are gradually set. With such a setting, the velocity and pressure distribution of the fluid can be changed while maintaining a constant fluid flow rate through the height and width gradual design of the variable flow section 12 in the flow channel portion 10. This helps to accelerate the discharge of the water generated by the reaction in the flow channel 11, avoid water blockage and local overheating, thereby improving the water and heat management capabilities of the fuel cell and ensuring the efficient and stable operation of the system. And such a setting can effectively guide the reaction medium to flow to the three-phase junction, which is conducive to improving the utilization rate of the reaction medium and improving the overall performance of the fuel cell.

[0062] Specifically, along the extension direction of the flow channel portion 10, the height of the variable flow section 12 first gradually decreases and then gradually increases. With such a structural setting, by designing a variable flow section 12 whose height first decreases and then increases, the principle of fluid dynamics can be used to promote the water in the flow channel 11 to flow to the flow channel outlet more effectively, thereby avoiding the degradation of membrane electrode performance caused by water accumulation. At the same time, the height of the flow channel 11 decreases and the flow velocity increases, which helps to increase the flow velocity of the fluid in the flow channel 11 and promote the rapid flow of the fluid, which helps to accelerate the discharge of the water generated by the reaction in the flow channel 11, avoid water blockage and local overheating, and thus improve the water thermal management capability of the fuel cell. In this way, the variable flow section 12 with a gradually changing height avoids fixed height obstacles similar to bosses, so that the resistance to which the fluid is subjected to changes more slowly during the flow process, thereby reducing the overall pressure drop and improving the economy and efficiency of the system operation.

[0063] Specifically, along the extension direction of the flow channel portion 10, the width of the variable flow section 12 first gradually decreases and then gradually increases. With such a structural setting, by designing the variable flow section 12 whose width first decreases and then increases, the principle of fluid dynamics can be used to promote the water in the flow channel 11 to flow to the flow channel outlet more effectively, thereby avoiding the degradation of membrane electrode performance caused by water accumulation. At the same time, the width of the flow channel 11 decreases and the flow velocity increases, which helps to increase the flow velocity of the fluid in the flow channel 11 and promote the rapid flow of the fluid, which helps to accelerate the discharge of the water generated by the reaction in the flow channel 11, avoid water blockage and local overheating, thereby improving the water thermal management capability of the fuel cell. At the same time, this design of first decreasing and then increasing can also ensure the smooth flow of the fluid in the flow channel 11, reduce the generation of bubbles, and improve the stability and efficiency of the battery.

[0064] In this embodiment, if Fig.11As shown, the height of the minimum cross section of the variable flow section 12 is H1, the height of the maximum cross section of the variable flow section 12 is H2, and 1.5≤H2 / H1≤2.5. With such a structural setting, by setting a gradual height from H2 to H1 and then to H2 in the variable flow section 12, the cross-sectional area of ​​the flow channel 11 changes accordingly. According to the principles of fluid mechanics, when the cross-sectional area of ​​the flow channel 11 becomes smaller, the flow rate will increase, and vice versa. In fuel cells, this helps to better control the flow of water generated by the reaction, accelerate the discharge of water, and at the same time improve the cooling effect and prevent overheating, thereby improving the water thermal management performance of the fuel cell. In addition, the set ratio of H2 / H1 ensures the uniform distribution of the fluid in the flow channel 11, avoids local flow rates that are too fast or too slow, ensures the uniform distribution of the reaction gas on the membrane electrode, and reduces the concentration polarization phenomenon. By reasonably controlling the minimum cross-sectional height H1 and the maximum cross-sectional height H2 of the variable flow section 12 and the proportional relationship between the two, the flow path and efficiency of the flow channel 11 can be optimized without sacrificing mechanical strength, thereby further improving the durability and operating stability of the fuel cell.

[0065] Specifically, Fig.11 As shown, the width of the minimum cross section of the variable flow section 12 is W1, and the width of the maximum cross section of the variable flow section 12 is W2, 3≤W2 / W1≤5. With such a structural setting, by setting a flow channel 11 with a width gradually changing from W2 to W1 and then to W2 in the variable flow section 12, the fluid distribution can be optimized and the turbulent loss of the fluid can be reduced. At the same time, in the gradually widening flow channel 11, the fluid velocity will decrease accordingly, while in the gradually narrowing flow channel 11, the fluid velocity will increase. This design helps to improve the efficiency of fluid dynamics. The gradual change in the width of the flow channel 11 can improve the distribution of the medium, especially in the narrow section, the increase in flow rate helps to quickly discharge the water generated by the electrochemical reaction and avoid water thermal management problems caused by water accumulation. The change in the width of the flow channel 11 can also optimize the structural design of the battery plate 1, increase the stability and strength of the structure, and reduce the deformation of the plate caused by gas pressure and thermal stress, thereby improving the reliability and service life of the fuel cell.

[0066] It should be noted that the minimum cross section of the variable section 12 refers to the minimum cross section area of ​​the variable section 12 along the extension direction of the flow channel portion 10. The maximum cross section of the variable section 12 refers to the maximum cross section area of ​​the variable section 12 along the extension direction of the flow channel portion 10.

[0067] Specifically, the flow conversion section 12 includes a first side portion 121, a bottom portion 122, and a second side portion 123 connected in sequence, and the first side portion 121 and the second side portion 123 are arranged opposite to each other; wherein the first side portion 121 and the second side portion 123 are both arranged obliquely. With such a structural arrangement, the oblique arrangement can guide the fluid to form a more complex flow path, thereby further increasing the flow velocity of the fluid, helping to accelerate the discharge of water generated by the reaction in the flow field, thereby improving the water thermal management capability of the battery and reducing the performance degradation or damage caused by water accumulation.

[0068] Specifically, Figure 3 and Fig.11 As shown, the first side portion 121 and the bottom portion 122 are connected by a first arc segment, and the second side portion 123 and the bottom portion 122 are connected by a second arc segment. The end of the first side portion 121 away from the bottom portion 122 forms a third arc segment, and the end of the second side portion 123 away from the bottom portion 122 forms a fourth arc segment, and the radius of the third arc segment is the same as the radius of the fourth arc segment. The radius of the portion of the fourth arc segment at the minimum cross section is R1, and the radius of the portion of the fourth arc segment at the maximum cross section is R2, and R1=R2. The radius of the portion of the third arc segment at the minimum cross section is the same as the radius of the third arc segment at the maximum cross section. The radius of the first arc segment is equal to the radius of the second arc segment, wherein the radius of the second arc segment at the maximum cross section is R3, and R3=R2-d; d is the thickness of the second side portion 123. With such a setting, the use of arc segments can effectively reduce the flow resistance of the medium flowing in the flow channel 11. Compared with right-angle or acute-angle connections, arcs can provide a smoother fluid path, reduce turbulence and fluid separation, thereby reducing pressure drop and improving the efficiency of the fuel cell.

[0069] Specifically, Figure 1 and Figure 3 As shown, along the extension direction of the flow channel portion 10, the inclination angle of the first side portion 121 relative to the bottom portion 122 first gradually increases and then gradually decreases. With such a structural arrangement, after the fluid enters the flow channel 11, due to the small initial inclination angle of the first side portion 121, the fluid is easy to be evenly distributed at the entrance of the flow channel 11, thereby avoiding the accumulation of the fluid at the entrance or the generation of turbulence. As the fluid advances along the flow channel 11, the inclination angle of the first side portion 121 gradually increases, which will cause the flow path of the fluid in the flow channel 11 to become shorter, the flow velocity to increase, and the fluid dynamic effect to be enhanced. This is conducive to accelerating the discharge of water generated by the reaction in the flow channel 11 and reducing water retention, thereby optimizing water thermal management, reducing concentration polarization, and improving the performance and durability of the fuel cell. At the same time, by controlling the gradual change of the inclination angle, the resistance to fluid flow can be better adjusted, further reducing energy waste, and improving the overall energy conversion efficiency of the fuel cell.

[0070] Specifically, Figure 1 and Figure 3 As shown, along the extension direction of the flow channel portion 10, the inclination angle of the second side portion 123 relative to the bottom portion 122 first gradually increases and then gradually decreases. At the minimum cross-section of the variable flow section 12, the angle between the first side portion 121 and the second side portion 123 is a, and at the maximum cross-section of the variable flow section 12, the angle between the first side portion 121 and the second side portion 123 is b; 1.5≤a / b≤2. With such a structural arrangement, by controlling the change in the cross-sectional shape of the flow channel 11, dynamic adjustment of the flow velocity can be achieved at different parts of the flow channel 11. By controlling the change in the inclination angle between the first side portion 121 and the second side portion 123, the flow state of the fluid in the flow channel 11 can be effectively adjusted, local accumulation of the fluid at the inlet and outlet of the flow channel 11 can be avoided, and the flow velocity of the fluid can be increased.

[0071] In this embodiment, the variable flow section 12 includes a slowly changing portion 124 and a suddenly changing portion 125, one end of the slowly changing portion 124 is connected to one end of the flat flow section 13, and the other end of the slowly changing portion 124 is connected to one end of the suddenly changing portion 125; wherein, along the extension direction of the flow channel portion 10, the rate of change of the cross-sectional area of ​​the slowly changing portion 124 is less than the rate of change of the cross-sectional area of ​​the suddenly changing portion 125. With such a structural setting, through the combined design of the slowly changing portion 124 and the suddenly changing portion 125, a smooth transition and efficient flow of the fluid in the flow channel 11 can be achieved, and the fluid is prevented from being subjected to a large resistance when flowing to the connection between the variable flow section 12 and the flat flow section 13, which affects the flow velocity, thereby promoting the stripping and discharge of the reaction generated water, reducing the accumulation of water, improving the water thermal management, and reducing the concentration polarization phenomenon. The rate of change of the cross-sectional area of ​​the slowly changing portion 124 is small, so that the fluid can smoothly transition before entering the suddenly changing portion 125, avoiding the turbulence or uneven distribution of the fluid in the flow channel 11 due to the sudden change of the cross-sectional area.

[0072] It should be noted that the “rate of change of the cross-sectional area of ​​the gradual change portion 124” refers to the ratio between the difference between the maximum cross-sectional area and the minimum cross-sectional area of ​​the gradual change portion 124 and the length of the gradual change portion 124 in the direction in which the flow channel portion 10 extends. The “rate of change of the cross-sectional area of ​​the sudden change portion 125” refers to the ratio between the difference between the maximum cross-sectional area and the minimum cross-sectional area of ​​the sudden change portion 125 and the length of the sudden change portion 125 in the direction in which the flow channel portion 10 extends.

[0073] Specifically, there are two slowly changing parts 124, and the sudden change part 125 is located between the two slowly changing parts 124. Along the extension direction of the flow channel part 10, the length of the sudden change part 125 is L1, and the height of the maximum cross section of the variable flow section 12 is H2; wherein, 10≤L1 / H2≤15. With such a structural setting, the sudden change part 125 is placed between the two slowly changing parts 124, which can avoid the sudden entry into the low flow rate area directly from the high flow rate area, thereby reducing the pressure drop during the fluid flow process, reducing energy loss, and improving the overall performance of the fuel cell. The setting of the ratio ensures that the flow channel 11 will not change too fast or too slow during the diameter change process, which is conducive to accelerating the discharge of the water generated by the reaction in the flow channel 11, reducing the retention of water, thereby optimizing the water thermal management, reducing the concentration polarization, and improving the performance and durability of the fuel cell. In addition, by optimizing the lengths of L1 and L2, the structural stability of the flow channel 11 can be ensured, the stress caused by the pressure drop and flow rate changes can be reduced, and the service life of the plate can be extended.

[0074] Specifically, Figure 2 As shown, there are two slowly changing parts 124, and the sudden change part 125 is located between the two slowly changing parts 124. Along the extension direction of the flow channel part 10, the length of the sudden change part 125 is L1, and the length of the variable flow section 12 is L2; ​​wherein, 1.5≤L2 / L1≤2.5. With such a structural setting, the slowly changing part 124 can smoothly adjust the flow rate of the working medium by gradually changing the cross-sectional area of ​​the flow channel 11, and prevent turbulence or stagnation caused by sudden changes in the flow rate. At the same time, by precisely controlling the length ratio of the slowly changing part 124 and the sudden change part 125, the flow path of the fluid can be further optimized, the thermal management capability and reaction efficiency of the battery can be improved, and at the same time, the use of materials can be reduced, and the cost of the battery can be reduced. This design will have significant advantages in battery applications that require high cost performance and long life, such as home energy storage systems, electric bicycles, etc.

[0075] In this embodiment, there are multiple flow channel parts 10, and the multiple flow channel parts 10 are arranged at intervals along a preset direction; wherein, along the extension direction of the flow channel part 10, the flow change sections 12 of two adjacent flow channel parts 10 are arranged in a staggered manner. With such an arrangement, the battery plate 1 can be formed in a complex structure through a staggered arrangement, which can avoid the problem of excessive thinning rate after stamping of the substrate, cracking and failure to form.

[0076] Specifically, Figure 2 and Fig. 9 As shown, along the extension direction of the flow channel portion 10, the spacing between the flow conversion sections 12 of two adjacent flow channel portions 10 is L3, the length of the flow conversion section 12 is L2, and L3 / L2>1.5. With such a setting, it is possible to better avoid the problem of the battery plate 1 having a complex molding structure, resulting in excessive thinning rate after stamping of the substrate, cracking, and failure to form by setting the misalignment and length ratio.

[0077] In this embodiment, in a single flow channel 11, the width and height of the flow channel 11 are gradually changed, and the working medium moves up and down in the flow channel 11. By changing the cross-sectional area, the flow velocity is changed to bring out the water generated by the reaction. The width of the flow channel 11 decreases as the height of the flow channel 11 decreases, and the inclination angle increases as the height of the flow channel 11 decreases, which is equivalent to moving in channels with different trapezoidal cross-sections. The height of the flow channel 11 changes according to H2→H1→H2, the width changes according to W2→W1→W2, and the inclination angle changes according to b→a→b.

[0078] Specifically, Fig.13 and Fig.14 As shown in the figure, different arc lengths represent different flow channels 11 on the battery plate 1. As can be seen from the figure, Fig.14 The fluid flow rate in each flow channel of the battery plate 1 provided in this embodiment is greater than Fig.13 Compared with the comparative example in the prior art, the battery plate 1 provided in this embodiment can realize dynamic adjustment of the flow rate while keeping the overall flow rate constant by gradually changing the cross-sectional area of ​​the variable flow section 12, and the flow rate change in the flow channel 11 can promote the turbulence of the fluid, thereby accelerating the discharge of water generated by the reaction in the flow field and improving the system's water and heat management capabilities.

[0079] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: by slowly changing the height and width of the flow channel and changing the cross-section, different flow velocities can be obtained while the flow rate remains unchanged, thereby accelerating the discharge of water generated by the reaction in the flow field and improving the system's hydrothermal management capabilities. At the same time, the reaction medium can be guided to the three-phase junction to improve the system's fuel utilization efficiency and performance.

[0080] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0081] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0082] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0083] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0084] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery plate, characterized in that: include: A flow channel portion (10), wherein the flow channel portion (10) encloses a flow channel (11) for allowing a fluid to flow; The flow channel (11) comprises at least two flow-changing sections (12) and at least one flow-leveling section (13); at least two flow-changing sections (12) are arranged at intervals along the extension direction of the flow channel portion (10); the flow-leveling section (13) is arranged between two adjacent flow-changing sections (12); the flow-leveling section (13) is used to be arranged in contact with the membrane electrode of the battery, and at least part of the flow-changing section (12) is used to be arranged at intervals from the membrane electrode; Wherein, along the extension direction of the flow channel portion (10), the cross-sectional area of ​​the flow-changing section (12) is arranged to be gradually changed.

2. The battery plate according to claim 1, characterized in that: Along the extension direction of the flow channel portion (10), the height and width of the flow changing section (12) are both arranged to be gradually changed.

3. The battery plate according to claim 2, characterized in that: Along the extension direction of the flow channel portion (10), the height of the flow-changing section (12) first gradually decreases and then gradually increases; or, Along the extension direction of the flow channel portion (10), the width of the flow-changing section (12) first gradually decreases and then gradually increases.

4. The battery plate according to claim 2, characterized in that: The height of the minimum cross section of the flow conversion section (12) is H1, and the height of the maximum cross section of the flow conversion section (12) is H2, 1.5 ≤ H2 / H1 ≤ 2.5; and / or, The width of the minimum cross section of the variable flow section (12) is W1, and the width of the maximum cross section of the variable flow section (12) is W2,3≤W2 / W1≤5.

5. The battery plate according to claim 1, characterized in that: The flow-changing section (12) comprises a first side portion (121), a bottom portion (122) and a second side portion (123) which are connected in sequence, and the first side portion (121) and the second side portion (123) are arranged opposite to each other; Wherein, the first side portion (121) and the second side portion (123) are both arranged at an inclination.

6. The battery plate according to claim 5, characterized in that: Along the extension direction of the flow channel portion (10), the inclination angle of the first side portion (121) relative to the bottom portion (122) first gradually increases and then gradually decreases; and / or, Along the extension direction of the flow channel portion (10), the inclination angle of the second side portion (123) relative to the bottom portion (122) first gradually increases and then gradually decreases; and / or, At the minimum cross-section of the variable flow section (12), the angle between the first side portion (121) and the second side portion (123) is a; at the maximum cross-section of the variable flow section (12), the angle between the first side portion (121) and the second side portion (123) is b; 1.5≤a / b≤2.

7. The battery plate according to claim 1, characterized in that: The current conversion section (12) comprises: A gradually changing portion (124) and a suddenly changing portion (125), wherein one end of the gradually changing portion (124) is connected to one end of the horizontal flow section (13), and the other end of the gradually changing portion (124) is connected to one end of the suddenly changing portion (125); Wherein, along the extension direction of the flow channel portion (10), the rate of change of the cross-sectional area of ​​the gradually changing portion (124) is smaller than the rate of change of the cross-sectional area of ​​the suddenly changing portion (125).

8. The battery plate according to claim 7, characterized in that: There are two gradually changing portions (124), and the sudden change portion (125) is located between the two gradually changing portions (124); along the extension direction of the flow channel portion (10), the length of the sudden change portion (125) is L1, the length of the flow changing section (12) is L2, and the height of the maximum cross section of the flow changing section (12) is H2; Among them, 10≤L1 / H2≤15; and / or, 1.5≤L2 / L1≤2.

5.

9. The battery plate according to claim 1, characterized in that: There are a plurality of flow channel portions (10), and the plurality of flow channel portions (10) are arranged at intervals along a preset direction; Wherein, along the extension direction of the flow channel portion (10), the flow-changing sections (12) of two adjacent flow channel portions (10) are arranged in a staggered manner.

10. The battery plate according to claim 9, characterized in that: Along the extension direction of the flow channel portion (10), the spacing between the flow-changing sections (12) of two adjacent flow channel portions (10) is L3, the length of the flow-changing section (12) is L2, and L3 / L2>1.5.

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