Battery plate and battery

Abstract

The utility model provides a battery plate and a battery. The battery pole plate comprises a main pole plate, the main pole plate is provided with a main flow channel and a plurality of branch flow channels which are communicated in sequence, an inlet of the main flow channel is used for introducing gas, and the branch flow channels are arranged at intervals along the peripheral direction of the main flow channel; wherein each branch flow channel comprises a branch main flow channel and at least two branch flow channels, the at least two branch flow channels are communicated with the branch main flow channel, and a branch outlet used for exhausting gas is formed in the end, away from the branch main flow channel, of each branch flow channel. According to the technical scheme provided by the utility model, the technical problem that the pressure drop between the inlet and the outlet of the battery plate runner in the prior art is relatively large can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery pole plate technical field, specifically, relate to a battery pole plate and battery. BACKGROUND

[0002] At present, in the working process of proton exchange membrane fuel cell, flow field plays the role of distributing reaction gas, conducting current, guiding gas and the like. Poor flow field design can lead to uneven distribution of reaction gas in fuel cell, local hot spots, unstable current density and water flooding and the like.

[0003] However, as shown in the common proton exchange membrane fuel cell bipolar plate flow field is serpentine flow channel 60. The advantage of serpentine flow channel 60 is that it has good drainage capacity, but in a large area of flow field, this flow channel can cause a large pressure drop between the inlet and outlet of the flow channel, increasing the power loss. Figure 1 SUMMARY The utility model discloses a battery pole plate and battery, to solve the technical problem of the pressure drop between the inlet and outlet of the flow channel of the battery pole plate in the prior art.

[0004] The main purpose of the utility model is to provide a battery pole plate and battery, to solve the technical problem of the pressure drop between the inlet and outlet of the flow channel of the battery pole plate in the prior art.

[0005] In order to achieve the above purpose, according to one aspect of the utility model, a battery pole plate is provided, comprising:

[0006] The main pole plate has a main flow channel and a plurality of branch flow channels in sequence, the inlet of the main flow channel is used for passing in gas, and the plurality of branch flow channels are arranged along the peripheral direction of the main flow channel.

[0007] Each branch flow channel includes a branch main flow path and at least two branch branch flow paths, the at least two branch branch flow paths are communicated with the branch main flow path, and the end of the branch branch flow path away from the branch main flow path forms a branch outlet for discharging gas.

[0008] Further, each branch flow channel further includes an intermediate branch flow path, the inlet connecting end of the intermediate branch flow path is connected with the outlet end of the branch main flow path, the intermediate branch flow path has at least one outlet connecting end, and the inlet end of one branch branch flow path is connected and arranged with one outlet connecting end of the intermediate branch flow path.

[0009] Further, a and b are both positive integers.

[0010] The intermediate branch flow path is one, the ratio of the number of intermediate branch flow paths to the number of branch main flow paths is 1, and the ratio of the number of at least two branch branch flow paths to the number of intermediate branch flow paths is 2 b-1 ; or,

[0011] The intermediate branch flow path is one, and the minimum value of the angle between the intermediate branch flow path and the branch main flow path is α, and the minimum value of the angle between one of the at least two branch branch flow paths and the intermediate branch flow path is α; or, a-1 The number of the at least two branch branch flow paths is 2 times the number of the part of the plurality of intermediate branch flow paths adjacent to the at least two branch branch flow paths. b-1 .

[0012] Further, 90° < α < 180°;

[0013] The minimum value of the angle between one of the at least two branch branch flow paths and the branch main flow path is α; and / or,

[0014] The intermediate branch flow path is one, and the minimum value of the angle between the intermediate branch flow path and the branch main flow path is α, and the minimum value of the angle between one of the at least two branch branch flow paths and the intermediate branch flow path is α; or,

[0015] The intermediate branch flow path is one, and the minimum value of the angle between the intermediate branch flow path and the branch main flow path is α, and the minimum value of the angle between one of the at least two branch branch flow paths and the intermediate branch flow path is α; or,

[0016] Further, the intermediate branch flow path is one, and the ratio of the maximum width of the intermediate branch flow path in its own extension direction to the maximum width of the branch main flow path in its own extension direction is greater than 1 and less than or equal to 3; the ratio of the maximum width of one of the at least two branch branch flow paths in its own extension direction to the maximum width of the intermediate branch flow path in its own extension direction is greater than 1 and less than or equal to 3; or,

[0017] The intermediate branch flow path is one, and the minimum value of the angle between the intermediate branch flow path and the branch main flow path is α, and the minimum value of the angle between one of the at least two branch branch flow paths and the intermediate branch flow path is α; or,

[0018] Further, C is a preset constant value;

[0019] The length of the branch main flow path is L1, the width of the branch main flow path is D1, D1 3 =C·L1; and / or,

[0020] The length of each branch flow path is L2, the width of each branch flow path is D2, D2 3 =C·L2.

[0021] Further, the cross section of the branch main flow path is arc-shaped or polygonal along the extension direction of the branch main flow path; and / or,

[0022] The cross section of each branch flow path is arc-shaped or polygonal along the extension direction of each branch flow path.

[0023] Further, each branch flow path is a groove structure;

[0024] The sum of the inner surface areas of each branch main flow path is equal to the sum of the inner surface areas of each branch flow path; and / or,

[0025] The groove depth of each branch main flow path is equal to the groove depth of each branch flow path.

[0026] Further, the main flow path is a groove structure, the main flow path has a main end wall and a main peripheral wall connected to each other, each branch flow path is connected to the main peripheral wall, and the inlet is arranged at the main end wall; or the main flow path is an annular groove structure, one end of the main flow path surrounds the inlet, and each branch flow path is connected to the annular peripheral wall of the main flow path; and / or,

[0027] The main polar plate is a disc structure, and each branch outlet is located at the periphery of the disc structure.

[0028] According to another aspect of the present application, a battery is provided, comprising: the battery polar plate provided above.

[0029] The technical scheme of the utility model, through the combination of the main flow channel and the multi-stage branch flow channel, the flow channel design can obviously improve the uniformity of the gas distribution on the battery plate. The main flow channel on the main plate is used as the gas introduction channel, and the branch flow channel is used to effectively distribute the gas to the whole electrode surface through its complex but orderly structure, and promote the liquid water generated by the reaction to be quickly discharged from the branch outlet, so as to avoid the waterlogging phenomenon and improve the operation efficiency and stability of the battery. The design of the branch flow channel follows certain fluid dynamics principles, and through the reasonable arrangement of the branch main flow path and the branch branch flow path, the length of the flow path can be effectively shortened, so as to reduce the pressure drop between the inlet and the branch outlet, and at the same time, the distribution of the gas on the whole electrode surface is ensured, and the forced convection and diffusion of the reaction gas are promoted. The design of the flow channel is a bionic flow channel simulating the distribution of lotus leaf veins, and the lotus-shaped branch flow channel has a certain pressure gradient between adjacent flow channels, so as to promote the mass transfer and improve the uniformity of the water distribution in the flow channel. At the same time, the lotus-shaped branch flow channel effectively reduces the pressure loss from the inlet to the branch outlet of the flow channel, so that the pressure difference between the inlet and the branch outlet of the flow channel is maintained at a relatively stable value, and then the battery operation energy consumption is reduced. Therefore, through the technical scheme of the utility model, the technical problem of large pressure drop between the inlet and the outlet of the battery plate flow channel in the prior art can be solved. BRIEF DESCRIPTION OF DRAWINGS

[0030] The drawings accompanying the specification of this application form a part of the application and serve to further provide a further understanding of the application, the illustrative embodiments of the application and its description serve to explain the application without limiting the application in any way. In the drawings:

[0031] Figure 1 A structural schematic diagram of a battery plate with a serpentine flow channel in the prior art is shown;

[0032] Figure 2 A front view of a battery plate according to an embodiment of the utility model is shown;

[0033] Figure 3 A polarization curve comparison diagram of a battery plate according to an embodiment of the utility model and a battery plate with a serpentine flow channel in the prior art is shown;

[0034] Figure 4 A power density curve comparison diagram of a battery plate according to an embodiment of the utility model and a battery plate with a serpentine flow channel in the prior art is shown.

[0035] Among them, the above drawings include the following reference signs:

[0036] 10, main plate;

[0037] 20, main flow channel;

[0038] 21. an inlet;

[0039] 22. a main end wall;

[0040] 23. a main peripheral wall;

[0041] 30. a branch main flow path;

[0042] 40. a branch sub-flow path;

[0043] 41. a branch outlet;

[0044] 50. a gas diffusion portion;

[0045] 60. a serpentine flow channel. DETAILED DESCRIPTION

[0046] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0047] As shown in Figures 2 to 4 Embodiment one of the present application provides a battery plate, which comprises a main plate 10, the main plate 10 has a main flow channel 20 and a plurality of branch flow channels which are sequentially communicated, the inlet 21 of the main flow channel 20 is used for passing in gas, and the plurality of branch flow channels are arranged along the peripheral direction of the main flow channel 20. Wherein each branch flow channel comprises a branch main flow path 30 and at least two branch sub-flow paths 40, the at least two branch sub-flow paths 40 are all communicated with the branch main flow path 30, and the end of the branch sub-flow path 40 away from the branch main flow path 30 forms a branch outlet 41 used for discharging gas.

[0048] The battery pole plate provided by the embodiment one of the utility model can improve the distribution uniformity of the gas on the battery pole plate by combining the main flow channel 20 and the multi-stage branch flow channel. The main flow channel 20 on the main pole plate 10 is used as the gas introduction channel, and the branch flow channel (branch main flow path 30 and branch branch flow path 40) can effectively distribute the gas to the whole electrode surface through the complex but orderly structure, and promote the liquid water generated by the reaction to be quickly discharged to the branch outlet 41, thereby avoiding the waterlogging phenomenon and improving the operation efficiency and stability of the battery. The design of the branch flow channel follows certain fluid dynamics principles, and the branch main flow path 30 and the branch branch flow path 40 are arranged reasonably, so that the length of the flow path can be effectively shortened, thereby reducing the pressure drop between the inlet 21 and the branch outlet 41, and ensuring the distribution of the gas on the whole electrode surface and promoting the forced convection and diffusion of the reaction gas. The design of the flow channel is a bionic flow channel simulating the distribution of lotus leaf veins, and the lotus-shaped branch flow channel has a certain pressure gradient between adjacent flow channels, thereby promoting the mass transfer and improving the uniformity of the water distribution in the flow channel. At the same time, the lotus-shaped branch flow channel effectively reduces the pressure loss from the inlet 21 to the branch outlet 41 of the flow channel, so that the pressure difference between the inlet 21 and the branch outlet 41 of the flow channel is maintained at a relatively stable value, thereby facilitating the reduction of the energy consumption of the battery operation. Therefore, the battery pole plate provided by the embodiment can solve the technical problem of large pressure drop between the inlet and outlet of the flow channel of the battery pole plate in the prior art.

[0049] Specifically, the plurality of branch flow channels are uniformly and spacedly arranged along the periphery of the main flow channel 20. By adopting such a structure, the gas can be uniformly distributed after entering the battery pole plate, thereby avoiding local supersaturation or overdrying, and improving the utilization rate of the reaction gas and the overall efficiency of the fuel cell. The uniform and spaced design can also reduce the flow resistance of the fluid between the flow channels, so that the gas flow and the liquid water flow generated by the reaction are more smooth, which helps to reduce the energy loss of the battery during operation.

[0050] Specifically, each branch flow channel further comprises an intermediate branch flow path, the inlet connection end of the intermediate branch flow path is connected with the outlet end of the branch main flow path 30, the intermediate branch flow path has at least one outlet connection end, and the inlet end of a branch branch flow path 40 is connected and arranged with one outlet connection end of the intermediate branch flow path. By adopting such a structure, the introduction of the intermediate branch flow path further refines the fluid distribution path, which acts as a bridge between the branch main flow path 30 and the branch branch flow path 40, and can more finely distribute the gas in the main flow channel 20 to every corner of the electrode surface. The multi-level flow channel structure design improves the uniformity of fluid transmission, reduces the performance decline caused by uneven gas distribution, avoids the fluid retention in the electrode, and enhances the fluid transmission and drainage efficiency.

[0051] Specifically, b is a positive integer; the number of intermediate branch flow paths is one, the ratio of the number of intermediate branch flow paths to the number of branch main flow paths 30 is 1, and the ratio of the number of at least two branch branch flow paths 40 to the number of intermediate branch flow paths is 2 b-1 With such a structure, through this exponential growth relationship, it ensures that the fluid can continue to be evenly distributed in the next level of flow channels, and at the same time, as the number of flow channels increases with the increase of flow channel levels, the increase of flow channel number effectively improves the drainage speed, prevents the accumulation of liquid water on the electrode surface, greatly reduces the risk of "waterlogging", thereby improving the stability and efficiency of the battery.

[0052] Specifically, a and b are both positive integers; the number of intermediate branch flow paths is multiple, the multiple intermediate branch flow paths are arranged in sequence along the extension direction of the branch main flow path 30 to the at least two branch branch flow paths 40, the ratio of the number of the part of the multiple intermediate branch flow paths adjacent to the branch main flow path 30 to the number of branch main flow paths 30 is 2 a-1 , and the ratio of the number of at least two branch branch flow paths 40 to the number of the part of the multiple intermediate branch flow paths adjacent to the at least two branch branch flow paths 40 is 2 b-1 In this way, more precise fluid distribution and mass transfer can be achieved, making the distribution of reaction gas on the electrode surface more uniform, improving the utilization rate of the catalyst and the reaction efficiency. The multiple intermediate branch flow paths arranged in sequence along the gas flow direction, the number relationship between the branch main flow path 30 and the branch branch flow path 40 enables uniform distribution of fluid on a wider electrode surface area, while ensuring that the fluid can be quickly and uniformly drained from the electrode surface. This design not only improves the stability of the battery during operation, but also effectively avoids local overheating and water management problems, thereby greatly improving the overall performance and operating efficiency of the battery.

[0053] Specifically, 1≤a≤3, 1≤b≤3. a and b are equal or not equal.

[0054] Specifically, the number of intermediate branch flow paths is one, the length of the intermediate branch flow path along its own extension direction is less than the length of the branch main flow path 30 along its own extension direction, and the length of each branch main flow path 30 along its own extension direction is less than the length of the intermediate branch flow path along its own extension direction. In this way, a flow channel structure with decreasing length is formed. This structure can make the fluid uniformly dispersed in a wider area, reduce the residence time of the fluid in the flow channel, thereby improving the reaction efficiency and avoiding local overheating or waterlogging phenomenon. The fluid is initially distributed in the branch main flow path 30, then further distributed in the intermediate branch flow path, and finally reaches the electrode surface in the branch branch flow path 40. The decreasing length design of the flow channel in this process not only improves the transmission efficiency of the fluid, but also reduces the energy loss in the fluid transmission process, improving the overall performance of the fuel cell.

[0055] Specifically, there are multiple intermediate branch paths, which are arranged sequentially along the extension direction of the main branch path 30 to at least two branch paths 40. The length of the intermediate branch path closer to the main branch path 30 in its own extension direction is greater than the length of the intermediate branch path closer to the branch path 40 in its own extension direction. This structural arrangement, with multiple intermediate branch paths, further refines the fluid distribution and transmission path, enabling more effective and uniform fluid coverage on the electrode surface. As the fluid is transported from the main channel 20 to the electrode surface, it is gradually distributed and refined by a finer network of channels. This length design ensures the uniformity and efficiency of fluid transmission, avoiding performance degradation due to uneven fluid distribution. Simultaneously, this decreasing length design helps optimize fluid resistance, reduce energy loss during fluid transmission, and improve the economy and efficiency of battery operation.

[0056] Specifically, along the extension direction of the main branch path 30, the ratio of the length of the main branch path 30 to the length of the branch tributary path 40 is greater than or equal to 1.5 and less than or equal to 5. This optimized length ratio effectively controls the pressure distribution within the flow channel, avoiding localized high or low pressure zones caused by mismatched flow channel lengths and reducing pressure loss during fluid transmission. This helps maintain the pressure difference across the battery within an optimal range, improving the battery's power output and stability.

[0057] Specifically, 90° < α < 180°. The minimum value of the angle between at least one of the two branch flow paths 40 and the main flow path 30 is α. This structural configuration aims to optimize the fluid dynamics within the flow channel network, ensuring a smooth fluid transport path from the main flow path 20 to the branch flow paths 40, avoiding fluid stagnation and accumulation at flow channel corners, thereby improving fluid transport efficiency and battery operational stability. Setting the angle α prevents abrupt changes in fluid direction within the flow channel network, reducing fluid resistance and allowing the fluid to flow more stably within the network, improving fluid distribution uniformity and fuel cell efficiency. Simultaneously, a well-designed angle also helps maintain a uniform fluid distribution on the electrode surface, preventing localized overheating and flooding, thus improving battery life and reliability.

[0058] Specifically, such as Figure 2As shown, the intermediate branch flow path is one, the minimum value of the included angle between the intermediate branch flow path and the branch main flow path 30 is a, and the minimum value of the included angle between one of the at least two branch branch flow paths 40 and the intermediate branch flow path is a. In this way, this design effectively optimizes the transmission path and transmission efficiency of the fluid. The design of the same included angle a ensures that the transmission process of the fluid in the flow channel network has good continuity and smoothness, reduces the resistance of the fluid at the corner, and avoids fluid stagnation or bubble generation. This flow channel structure design can promote the uniform distribution of the fluid in the flow channel, increase the contact area of the fluid and the electrode, thereby increasing the reaction efficiency, reducing energy loss, and improving the overall performance of the battery. In addition, the uniform included angle a helps to simplify the manufacturing process and reduce production costs.

[0059] Specifically, the intermediate branch flow path is multiple, the multiple intermediate branch flow paths are arranged in sequence along the extension direction of the branch main flow path 30 to the at least two branch branch flow paths 40, the minimum value of the included angle between one of the intermediate branch flow paths adjacent to the branch main flow path 30 and the branch main flow path 30 is a, and the minimum value of the included angle between one of the at least two branch branch flow paths 40 and one of the intermediate branch flow paths adjacent to the one of the at least two branch branch flow paths 40 is a. With such a structure, the transmission path of the fluid in the flow channel network can be further optimized. This design allows the fluid to be more dispersed and uniform in the flow channel network, and the optimization of the included angle a can reduce the flow resistance of the fluid in the complex flow channel structure, improve the fluid transmission efficiency and the utilization rate of the reaction gas. The combination of the multi-level flow channel design and the minimum included angle a ensures efficient distribution of the fluid in the flow channel network, reduces local hot spots inside the battery, and improves the voltage stability and efficiency of the battery. At the same time, the design of multiple intermediate branch flow paths improves the flexibility of fluid distribution, adapts to different battery sizes and electrode materials, and enhances the design adaptability and reliability of the battery electrode plate.

[0060] Specifically, the intermediate branch flow path is one, the maximum width of the intermediate branch flow path in its own extension direction is greater than 1 and less than or equal to 3 times the maximum width of the branch main flow path 30 in its own extension direction; the maximum width of one of the at least two branch branch flow paths 40 in its own extension direction is greater than 1 and less than or equal to 3 times the maximum width of the intermediate branch flow path in its own extension direction. With such a structure, the reasonable proportion design of the flow channel width helps to reduce the resistance of the fluid in the flow channel, reduce energy loss, and improve the fluid transmission efficiency. The flow channel design with gradually decreasing width can promote the uniform distribution of the fluid in the flow channel network, avoid over-saturation or over-drying of the fluid in some areas, and improve the catalyst utilization rate and battery performance. The specific proportion setting of the flow channel width helps to maintain the pressure gradient of the fluid in the flow channel network, promote the forced convection of the fluid, enhance the transmission and drainage capacity of the fluid, and reduce the "water flooding" phenomenon of the battery.

[0061] Specifically, there are multiple intermediate branch paths, arranged sequentially along the extension directions of the main branch path 30 to at least two branch paths 40. The ratio of the maximum width of the intermediate branch path adjacent to the main branch path 30 in its own extension direction to the maximum width of the main branch path 30 in its own extension direction is greater than 1 and less than or equal to 3. Similarly, the ratio of the maximum width of one of the at least two branch paths 40 in its own extension direction to the maximum width of the intermediate branch path adjacent to one of the at least two branch paths 40 in its own extension direction is greater than 1 and less than or equal to 3. This structural arrangement, with its multi-stage channel width ratio design, ensures uniform fluid distribution at each stage of the channel network, increasing the contact area between the fluid and the electrode, and enhancing reaction efficiency. The gradually narrowing channel design helps control the fluid flow velocity within the channel, reducing fluid accumulation in certain areas, avoiding localized drying or flooding, and improving battery stability and lifespan. The channel width ratio design can improve fluid dynamics characteristics, such as reducing turbulence and eddies, improving fluid flow smoothness, and reducing energy loss.

[0062] Specifically, the ratio of the maximum width of the intermediate tributary path closer to the main branch road 30 in its own extension direction to the maximum width of the intermediate tributary path farther from the main branch road 30 in its own extension direction is greater than 1 and less than or equal to 3.

[0063] In this embodiment, as Figure 2 As shown, C is a preset constant value. The length of the main branch path 30 is L1, and the width of the main branch path 30 is D1. 3 =C·L1. This structural design ensures that the fluid is transported in the flow channel with minimal energy consumption, improving fluid transport efficiency and reducing energy loss during battery operation. This design also makes the fluid distribution in the branch main flow path 30 more uniform, avoiding excessive local concentration or dispersion of the fluid, thereby improving catalyst utilization and overall battery performance. A well-designed flow channel size also enhances the durability of the flow channel, reducing wear and damage caused by fluid impact, and improving the lifespan and reliability of the battery plates.

[0064] Specifically, such as Figure 2 As shown, the length of each branch flow path 40 is L2, and the width of each branch flow path 40 is D2. 3 =C·L2.

[0065] It should be noted that the length is the dimension of the flow path along its own extension direction, and the width is the dimension of the flow path in the direction perpendicular to its own extension direction.

[0066] Specifically, along the extension direction of the branch main flow path 30, the cross section of the branch main flow path 30 is arc-shaped or polygonal. With such a structural arrangement, the arc-shaped cross section can reduce the resistance of the fluid in the flow channel and improve the fluid transmission efficiency, so that the fluid passes through the flow channel more smoothly. The polygonal cross section design helps to control the distribution of the fluid in the flow channel, ensuring uniform flow of the fluid in the flow channel, and avoiding accumulation of the fluid at the corner of the flow channel. The design of the two cross section shapes can adapt to different processing technologies, such as laser cutting, etching or injection molding, reducing the manufacturing cost and improving the processing efficiency.

[0067] Specifically, along the extension direction of each branch sub-flow path 40, the cross section of each branch sub-flow path 40 is arc-shaped or polygonal. With such a structural arrangement, the reasonable cross section shape design helps to control the pressure and flow rate of the fluid, reduces the formation of local hot spots and the occurrence of water flooding phenomenon, and improves the stability and efficiency of the battery.

[0068] Specifically, the polygon includes a triangle, a rectangle and a trapezoid.

[0069] Specifically, along the extension direction of the branch main flow path 30, the cross-sectional area of the branch main flow path 30 remains unchanged. Along the extension direction of each branch sub-flow path 40, the cross-sectional area of each branch sub-flow path 40 remains unchanged. In this way, the consistent cross section shape design simplifies the flow channel structure, making the flow channel design more standardized and facilitating large-scale production and maintenance.

[0070] In the present embodiment, each branch flow path is a groove structure. Among them, the sum of the inner surface areas of each branch main flow path 30 is equal to the sum of the inner surface areas of each branch sub-flow path 40. With such a structural arrangement, the effective reaction area of the reaction gas contact is consistent, so that the reaction is more sufficient, effectively improving the battery reaction efficiency and performance. In addition, by balancing the inner surface area of the flow channel, the uniform distribution of liquid water between the flow channels can be promoted, avoiding the accumulation of water in some flow channel areas, which helps to prevent the "water flooding" phenomenon, further ensuring the output stability and high efficiency of the battery.

[0071] Specifically, each branch flow channel is a groove structure. The groove depth of each branch main flow path 30 is equal to the groove depth of each branch branch flow path 40. With such a structural arrangement, the same groove depth can ensure consistency in the transmission process of the fluid between the branch main flow path 30 and the branch branch flow path 40, avoiding changes in fluid resistance caused by differences in flow channel depth, improving the uniformity and stability of fluid transmission. Standardization of groove depth helps to reduce pressure loss of fluid inside the flow channel, reduces energy loss in the fluid transmission process, and improves the operating efficiency of the battery. The same groove depth design simplifies the manufacturing process of the flow channel, reduces the processing difficulty, reduces the manufacturing cost, and at the same time improves the consistency and precision of the flow channel manufacturing.

[0072] Specifically, the main flow channel 20 is a groove structure, and the main flow channel 20 has a main end wall 22 and a main peripheral wall 23 connected to each other, each branch flow channel is connected to the main peripheral wall 23, and the inlet 21 is arranged at the main end wall 22. With such a structural arrangement, the groove structure increases the inner surface area of the main flow channel 20, which helps to improve the contact between the fluid and the flow channel wall, thereby promoting the transmission of the fluid and the diffusion of the gas, and improving the reaction efficiency. The connection mode of the main end wall 22 and the main peripheral wall 23 improves the structural stability of the flow channel, reduces the risk of deformation or damage of the flow channel under high pressure, thereby prolonging the service life of the battery.

[0073] Specifically, the main flow channel 20 is a ring groove structure, and one end of the main flow channel 20 surrounds the inlet 21, and each branch flow channel is connected to the ring peripheral wall of the main flow channel 20. With such a structural arrangement, the connection of the ring peripheral wall and the branch flow channel can better guide the fluid from the main flow channel 20 into the branch flow channel, ensuring the smoothness and continuity of fluid transmission, and reducing the retention of fluid in the flow channel.

[0074] In the present embodiment, the main electrode plate 10 is a disc structure, and each branch outlet 41 is located at the periphery of the disc structure. With such a structural arrangement, the disc structure provides a radial path for the transmission of fluid, which helps to uniformly diffuse the fluid from the inlet 21 located at the center of the disc structure to the periphery, reducing the pressure loss of the fluid inside the flow channel. The design of the branch outlet 41 at the disc periphery can more effectively discharge the fluid from the electrode surface, thereby avoiding the accumulation of fluid inside the battery, improving the transmission efficiency of the fluid and the operating efficiency of the battery. The design of the branch outlet 41 at the disc periphery helps to quickly discharge the liquid water, avoiding the retention of water between the electrode and the flow channel, improving the water management capability of the battery, and reducing the occurrence of "water flooding".

[0075] Specifically, the battery plate further comprises a gas diffusion part 50 arranged on the main plate 10, the gas diffusion part 50 being adjacent to each branch main flow path 30 and branch branch flow path 40. The gas diffusion part 50 is of a porous structure and is used to deliver the reaction gas to the surface of the battery electrode.

[0076] Specifically, the battery plate is a bipolar plate, and both plate surfaces of the bipolar plate are provided with the aforementioned main flow path 20 and a plurality of branch flow paths.

[0077] Specifically, the flow field structure on the battery plate in the present scheme is a bionic lotus leaf-shaped flow field structure, which comprises a gas flow field structure arranged in a lotus leaf shape, and the gas flow field structure comprises a reaction gas inlet (equivalent to the inlet 21), a reaction gas outlet (equivalent to the branch outlet 41), and a gas flow path (equivalent to the main flow path 20 and the plurality of branch flow paths). The reaction gas inlet is arranged at the center of the lotus leaf, and the reaction gas outlet is arranged at the edge of the lotus leaf. Specifically, the branch flow path has a plurality of branch flow paths, and the branch flow paths are distributed at the lotus leaf vein structure and extend to the lotus leaf edge.

[0078] In order to further verify the performance of the lotus leaf-shaped fuel cell flow path structure designed in the present scheme, the performance of the lotus leaf-shaped fuel cell flow path and the conventional serpentine fuel cell flow path is compared below, and the results are shown in Figure 3 and Figure 4 The performance test is carried out at a relative humidity of 70%, and the results are shown in Figure 3 Polarization curves and Figure 4 Power density curves. It can be seen from the polarization curves that the performance of the lotus leaf-shaped flow path is obviously better than that of the conventional serpentine flow path 60. When the current density is 0-0.6 A / cm 2 , the average voltage difference between the lotus leaf-shaped flow path and the serpentine flow path 60 is 0.2 V. When the current density exceeds 0.6 A / cm 2 , it can be seen that the difference between the lotus leaf-shaped flow path and the serpentine flow path 60 gradually appears, and the average voltage difference between the two is 0.5 V. With the increase of the current density, the voltage attenuation degree of the lotus leaf-shaped flow path is weak, the voltage of the lotus leaf-shaped flow path remains relatively stable, the voltage attenuation of the serpentine flow path 60 is obvious, and the voltage stability of the lotus leaf-shaped flow path is obviously better than that of the serpentine flow path 60. The power density curves show that when the current density is 0-0.6 A / cm 2 , the power density difference between the lotus leaf-shaped flow path and the serpentine flow path 60 is small. When the current density exceeds 0.6 A / cm 2 , the power density of both the lotus leaf-shaped flow path and the serpentine flow path 60 is improved, but the improvement amplitude of the lotus leaf-shaped flow path is obviously better than that of the serpentine flow path 60, and the power density of the serpentine flow path 60 is improved at a current density of 1.5 A / cm 2The voltage attenuation is small. The adjacent flow channels have pressure difference due to the lotus-shaped primary and secondary flow channel structure, thereby promoting the increase of the reaction gas concentration difference, promoting the forced convection and diffusion of the reaction gas, effectively promoting the uniformity of the gas transmission, improving the utilization rate of the catalyst, and making the voltage attenuation degree of the lotus-shaped flow channel better than that of the serpentine flow channel 60 when the current density increases, and the power output of the lotus-shaped flow channel is higher than that of the serpentine flow channel 60 and more stable.

[0079] The embodiment two of the utility model provides a kind of battery, and battery includes the battery plate provided in embodiment one.

[0080] The battery provided by the embodiment two of the utility model is combined with the main flow channel 20 and the multistage branch flow channel, and the flow channel design can significantly improve the uniformity of gas distribution on the battery plate. The main flow channel 20 on the main plate 10 serves as a gas inlet channel, while the branch flow channel (branch main flow path 30 and branch branch flow path 40) effectively distributes gas to the entire electrode surface through its complex but orderly structure, while promoting the rapid discharge of liquid water generated by the reaction to the branch outlet 41, avoiding waterlogging, improving the operating efficiency and stability of the battery. The design of such branch flow channel follows certain fluid dynamics principles, and by reasonably arranging the branch main flow path 30 and the branch branch flow path 40, the length of the flow path can be effectively shortened, thereby reducing the pressure drop between the inlet 21 and the branch outlet 41, while ensuring the distribution of gas on the entire electrode surface and promoting the forced convection and diffusion of the reaction gas. This flow channel design is a biomimetic flow channel that simulates the distribution of lotus leaf veins. The lotus-shaped branch flow channel has a certain pressure gradient between adjacent flow channels, thereby promoting mass transfer and improving the uniformity of water distribution in the flow channel. At the same time, the lotus-shaped branch flow channel effectively reduces the pressure loss from the inlet 21 to the branch outlet 41 of the flow channel, so that the pressure difference between the inlet 21 and the branch outlet 41 of the flow channel is maintained at a relatively stable value, thereby facilitating the reduction of battery operating energy consumption. Therefore, the battery provided by the embodiment can solve the technical problem of large pressure drop between the inlet and outlet of the battery plate flow channel in the prior art.

[0081] Specifically, the battery is a proton exchange membrane fuel cell.

[0082] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects: simple structure, easy to process and low cost, the flow channel is designed according to the bionic lotus leaf structure, so that the adjacent flow channels have pressure difference and reaction gas concentration difference, which promotes the forced convection and diffusion of the reaction gas, effectively promotes the uniformity of gas transmission, and effectively improves the performance of the fuel cell due to the uniform distribution of the reaction gas;On the other hand, the pressure gradient formed between the adjacent flow channels promotes the transmission of water, so that the distribution of water in the flow channel is more uniform than that of the traditional flow channel, and the local dryness phenomenon of the anode side electrolyte membrane is alleviated.At the same time, the lotus leaf-shaped primary and secondary flow channels also reduce the pressure loss from the inlet to the outlet of the flow channel, and play a role in forced drainage, so that the water generated in the cathode can be quickly discharged from the diffusion layer and reach the outlet through the flow channel, effectively preventing or alleviating the cathode "flooding" phenomenon.

[0083] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0084] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the present application, unless otherwise specifically stated. It should be understood that the dimensions of the various parts shown in the drawings are not drawn to scale for the sake of convenience in description. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail because such techniques, methods, and devices are considered to be part of the instant application. In all examples shown and discussed herein, any specific value is to be interpreted as merely an example, and not as a limitation. Thus, other examples of the example embodiments can have different values. It should be noted that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0085] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore, cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0086] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0087] In addition, it should be noted that the use of "first", "second", and the like words of similar meaning in the description above can simply mean that there are two or more of the identified components, and the identified components are distinguished from one another by the words "first", "second", and the like, unless otherwise indicated, and are not intended to limit the scope of the present application.

[0088] The above only is the preferred embodiment of the present application, and is not intended to limit the present application, and for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery plate, characterized by, The application relates to a battery plate, comprising: a main plate (10) having a main flow channel (20) and a plurality of branch flow channels which are sequentially communicated, an inlet (21) of the main flow channel (20) being used for passing in gas, the plurality of branch flow channels being arranged at intervals along a circumferential direction of the main flow channel (20); wherein each branch flow channel comprises a branch main flow path (30) and at least two branch branch flow paths (40), the at least two branch branch flow paths (40) are all communicated with the branch main flow path (30), and an end of the branch branch flow path (40) away from the branch main flow path (30) forms a branch outlet (41) used for discharging gas.

2. The battery plate of claim 1 wherein, Each branch flow channel further comprises an intermediate branch flow path, an inlet connecting end of the intermediate branch flow path is connected with an outlet end of the branch main flow path (30), and the intermediate branch flow path has at least one outlet connecting end, and an inlet end of one branch branch flow path (40) is connected and arranged with one outlet connecting end of the intermediate branch flow path.

3. The battery plate of claim 2 wherein, a and b are both positive integers; The number of the intermediate branch flow paths is 1, and the number of the at least two branch branch flow paths (40) to the number of the intermediate branch flow paths is 2 b-1 ; or, The intermediate branch flow paths are multiple, and the multiple intermediate branch flow paths are arranged in sequence along the extension direction of the branch main flow path (30) to the at least two branch branch flow paths (40), the ratio of the number of the part of the multiple intermediate branch flow paths adjacent to the branch main flow path (30) to the number of the branch main flow path (30) is 2 a-1 , and the ratio of the number of the at least two branch branch flow paths (40) to the number of the part of the multiple intermediate branch flow paths adjacent to the at least two branch branch flow paths (40) is 2 b-1 .

4. The battery plate of claim 2 wherein, 90°＜α＜180°； a minimum value of an included angle between one of the at least two branch branch flow paths (40) and the branch main flow path (30) is alpha; and / or, the intermediate branch flow path is one, a minimum value of an included angle between the intermediate branch flow path and the branch main flow path (30) is alpha, and a minimum value of an included angle between one of the at least two branch branch flow paths (40) and the intermediate branch flow path is alpha; or the intermediate branch flow path is a plurality, the plurality of intermediate branch flow paths are sequentially arranged along an extension direction of the branch main flow path (30) to the at least two branch branch flow paths (40), a minimum value of an included angle between one of the intermediate branch flow paths adjacent to the branch main flow path (30) and the branch main flow path (30) is alpha, and a minimum value of an included angle between one of the at least two branch branch flow paths (40) and one of the intermediate branch flow paths adjacent to the one of the at least two branch branch flow paths (40) is alpha.

5. The battery plate according to claim 2, wherein the intermediate branch flow path is one, a ratio of a maximum width of the intermediate branch flow path in its own extension direction to a maximum width of the branch main flow path (30) in its own extension direction is greater than 1 and less than or equal to 3, and a ratio of a maximum width of one of the at least two branch branch flow paths (40) in its own extension direction to a maximum width of the intermediate branch flow path in its own extension direction is greater than 1 and less than or equal to 3; or The intermediate branch flow paths are multiple, the multiple intermediate branch flow paths are arranged in sequence along the extension direction of the branch main flow path (30) to the at least two branch branch flow paths (40), the ratio of the maximum width of one of the intermediate branch flow paths adjacent to the branch main flow path (30) in its own extension direction to the maximum width of the branch main flow path (30) in its own extension direction is greater than 1 and less than or equal to 3; the ratio of the maximum width of one of the at least two branch branch flow paths (40) in its own extension direction to the maximum width of one of the intermediate branch flow paths adjacent to one of the at least two branch branch flow paths (40) in its own extension direction is greater than 1 and less than or equal to 3.

6. The battery plate of any one of claims 1 to 5, wherein, C is a preset constant value; The length of the branch main flow path (30) is L1, the width of the branch main flow path (30) is D1, D1 3 = C • L1; and / or, The length of each branch branch flow path (40) is L2, and the width of each branch branch flow path (40) is D2, D2 3 = C - L2.

7. The battery plate of any one of claims 1 to 5 wherein, Along the extension direction of the branch main flow path (30), the cross section of the branch main flow path (30) is arc-shaped or polygonal; and / or, Along the extension direction of each branch branch flow path (40), the cross section of each branch branch flow path (40) is arc-shaped or polygonal.

8. The battery plate of any one of claims 1 to 5, wherein, Each branch flow channel is a groove structure; Wherein, the sum of the inner surface areas of each branch main flow path (30) is equal to the sum of the inner surface areas of each branch branch flow path (40); and / or, The groove depth of each branch main flow path (30) is equal to the groove depth of each branch branch flow path (40).

9. The battery plate according to any one of claims 1 to 5, wherein, The main flow channel (20) is a groove structure, the main flow channel (20) has a main end wall (22) and a main peripheral wall (23) connected to each other, each branch flow channel is connected to the main peripheral wall (23), and the inlet (21) is arranged at the main end wall (22); or, the main flow channel (20) is an annular groove structure, one end of the main flow channel (20) surrounds the inlet (21), and each branch flow channel is connected to the annular peripheral wall of the main flow channel (20); and / or, The main plate (10) is a disc structure, and each branch outlet (41) is at the periphery of the disc structure.

10. A battery, characterized by Comprising: The battery plate according to any one of claims 1 to 9.

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