Polar plate assembly, assembly method thereof, auxiliary assembly tool and flow battery

Abstract

The invention relates to a polar plate assembly, an assembly method thereof, an auxiliary assembly tool and a flow battery. Wherein the auxiliary assembling tool is used for assisting the runner piece to be assembled on the polar plate, the auxiliary assembling tool comprises a plate body and a positioning hole formed in the plate body, the plate body is used for being attached to the polar plate, and the positioning hole is used for positioning when the runner piece is assembled on the polar plate. The auxiliary assembly tool can perform auxiliary positioning on the runner part when the runner part is assembled, so that the assembly precision is improved, the runner part is more accurately assembled at a preset position, the problem of non-uniform electrolyte distribution caused by runner dislocation during assembly is avoided, the battery performance is improved, and the assembly reliability and convenience are improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of liquid flow batteries, and in particular, to a plate assembly and an assembly method thereof, an auxiliary assembly tool, and a liquid flow battery. Background Art

[0002] As the core equipment of the liquid flow battery system, improving the power density of the fuel cell stack is one of the main technical bottlenecks in the current development. Among them, the use of flow channel design to improve the mass transfer of the electrolyte in the fuel cell stack is one of the effective ways to improve the power density of the fuel cell stack. The flow channels of traditional liquid flow batteries are generally machined or etched on graphite bipolar plates or electrodes. However, etching flow channels on graphite bipolar plates is not easy to operate and the cost is high. Therefore, a separate flow channel piece can be fixed on the plate to form a flow channel. However, when the flow channel piece is assembled on the plate, it is difficult to position the flow channel piece when it is installed on the plate, so that the position of the flow channel piece when assembled on the plate is not accurate enough, affecting the performance of the fuel cell stack. Summary of the invention

[0003] The purpose of the present disclosure is to provide a plate assembly and an assembly method thereof, an auxiliary assembly tool, and a flow battery. The auxiliary assembly tool of the plate assembly can be used to position the flow channel component when it is assembled on the plate, improve the assembly accuracy, make the flow channel component more accurately assembled on the plate, improve the accuracy and reliability during assembly, and make the flow channel component more convenient to assemble.

[0004] In order to achieve the above-mentioned objectives, the first aspect of the present disclosure provides an auxiliary assembly tool for a plate assembly, which is used to assist the assembly of a flow channel component on the plate. The auxiliary assembly tool includes a plate body and a positioning hole provided on the plate body. The plate body is used to fit the plate, and the positioning hole is used to position the flow channel component when it is assembled on the plate.

[0005] Optionally, there are two plates, and the two plates are respectively used to fit on two opposite sides of the electrode plate.

[0006] Optionally, a positioning structure is provided on the plate body, and the positioning structure is used to be plugged into the electrode plate liquid flow hole of the electrode plate.

[0007] Optionally, positioning structures are provided on both plate bodies, one of the two positioning structures is configured as a first positioning tube, and the other is configured as a second positioning tube, the first positioning tube is used to be inserted into the electrode plate liquid flow hole of the electrode plate, and the second positioning tube is inserted into the first positioning tube.

[0008] The second aspect of the present disclosure provides an assembly method of a plate assembly, wherein the flow channel component is assembled to the plate by using the auxiliary assembly tool provided by the first aspect of the present disclosure. The assembly method of the plate assembly includes: Adhere the plate body of the auxiliary assembly tool to at least one of two opposite surfaces of the electrode plate; Fixing the flow channel component to the electrode plate through the positioning hole; Disassemble the auxiliary assembly tool.

[0009] Optionally, the specific step of fixing the flow channel component to the electrode plate through the positioning hole includes: Applying the adhesive to the electrode plate through the positioning hole; Bonding the flow channel component to the electrode plate through the positioning hole; Placing the electrode plate and the flow channel member bonded together on a press to apply pressure; The electrode plate and the flow channel member bonded together are placed in the oven for drying and curing.

[0010] The third aspect of the present disclosure provides a plate assembly, which is assembled based on the plate assembly assembly method provided in the second aspect of the present disclosure, and the plate assembly includes a plate, at least one flow channel component and an adhesive, wherein the at least one flow channel component is bonded to the plate through the adhesive; the adhesive includes a conductive component, an adhesive component and a solvent component; The conductive component includes one or more of carbon nanotubes, graphene, carbon black, Ketjen black, acetylene black, and graphite; The bonding component includes one or more of polytetrafluoroethylene, polyvinylidene fluoride, sodium carboxymethyl cellulose, and polyurethane; The solvent component includes one or more of water, N-methylpyrrolidone, N-dimethylformamide, acetone, ethanol, methanol, and isopropanol.

[0011] Optionally, the adhesive includes polyvinylidene fluoride, carbon nanotubes, water, and N-methylpyrrolidone; Wherein, the mass ratio of the polyvinylidene fluoride to the carbon nanotubes is (5-15): (85-95).

[0012] Optionally, the flow channel member is made of one of flexible graphite, graphite plate, carbon composite plate, carbon felt or carbon cloth; and The thickness of the flow channel part is 0.5-5 mm, and the density of the flow channel part is 0.5-3 g / cm 3 .

[0013] A fourth aspect of the present disclosure provides a liquid flow battery, comprising the electrode plate assembly provided by the third aspect of the present disclosure.

[0014] Through the above technical solution, the auxiliary assembly tool of the plate assembly is used to assist the flow channel component in being assembled on the plate. The auxiliary assembly tool includes a plate body and a positioning hole provided on the plate body. The plate body is attached to the plate, and the positioning hole is used for positioning the flow channel component when it is bonded. The auxiliary assembly tool of the plate assembly can be used to position the flow channel component when it is assembled on the plate, improve the assembly accuracy, and enable the flow channel component to be assembled on the plate more accurately. Moreover, the auxiliary assembly tool can make the assembly of the flow channel component more convenient.

[0015] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a schematic structural diagram of a plate assembly provided in an exemplary embodiment of the present disclosure; Figure 2 is a structural schematic diagram of an auxiliary assembly tool for a plate assembly provided in an exemplary embodiment of the present disclosure, wherein the positioning structure of the assembly tool is configured as a first positioning cylinder; Figure 3 is a structural schematic diagram of an auxiliary assembly tool for a plate assembly provided in an exemplary embodiment of the present disclosure, wherein the positioning structure of the positioning plate is configured as a second positioning cylinder; Figure 4 is a schematic structural diagram of installing an auxiliary assembly tool on a pole plate provided in an exemplary embodiment of the present disclosure; Figure 5 yes Figure 5 AA section view in; Figure 6 The exemplary embodiment of the present disclosure provides Figure 6 A local enlarged view of position B in FIG. Figure 7 is an exploded schematic diagram of a single cell of a flow battery provided in an exemplary embodiment of the present disclosure; wherein the electrode plate is a bipolar plate; Figure 8 is provided in the exemplary embodiment of the present disclosure, which is different from Figure 7 Schematic diagram of the explosion of a single battery cell from a perspective; Fig. 9 is a schematic structural diagram of a first frame, a first flow channel member, and a first electrode provided in an exemplary embodiment of the present disclosure in a superimposed manner; Fig.10 is a schematic structural diagram of a first electrode plate assembly and a first electrode superimposed in an exemplary embodiment of the present disclosure; Fig.11 is a CC cross-sectional view provided in an exemplary embodiment of the present disclosure; Fig.12 is a flowchart of an assembly method of a plate assembly provided in an exemplary embodiment of the present disclosure; Fig.13 is a flowchart of specific steps of fixing the flow channel member to the electrode plate through the positioning hole provided in an exemplary embodiment of the present disclosure; Fig.14 is a flowchart of an assembly method of a plate assembly provided in yet another exemplary embodiment of the present disclosure.

[0017] Description of Reference Numerals 10-plate assembly; 10a-first plate assembly; 10b-second plate assembly; 11-plate; 11a-first plate; 11b-second plate; 12-channel member; 12a-first channel member; 12b-second channel member; 13-channel; 131-liquid inlet channel; 132-liquid outlet channel; 14-plate liquid flow hole; 14a-first plate liquid flow hole; 14b-second plate liquid flow hole; 15-adhesive; 20-electrode frame; 21-first frame; 211-first liquid inlet channel; 212-first liquid outlet channel; 213-first frame liquid flow hole; 213a -first frame liquid inlet hole; 213b-first frame liquid outlet hole; 214-first frame opening; 22-second frame; 221-second liquid inlet flow path; 222-second liquid outlet flow path; 223-second frame liquid flow hole; 223a-second frame liquid inlet hole; 223b-second frame liquid outlet hole; 224-second frame opening; 30-electrode; 31-first electrode; 32-second electrode; 40-isolating membrane; 41-isolating membrane liquid flow hole; 50-auxiliary assembly tool; 51-plate body; 52-positioning hole; 53-positioning structure; 53a-first positioning cylinder; 53b-second positioning cylinder. DETAILED DESCRIPTION

[0018] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0019] In the present disclosure, unless otherwise specified, the directional words used, such as "inside" and "outside", refer to the inside and outside of the outline of the component or structure itself; unless otherwise specified, the terms "first" and "second" are used to distinguish one element from another, and do not have order or importance. In addition, in the description with reference to the drawings, the same mark in different drawings represents the same element.

[0020] like Figures 2 to 6As shown, the first aspect of the present disclosure provides an auxiliary assembly tool for a plate assembly, which is used to assist the flow channel component 12 in being assembled on the plate 11. The auxiliary assembly tool 50 includes a plate body 51 and a positioning hole 52 provided on the plate body 51. The plate body 51 is used to fit the plate 11, and the positioning hole 52 is used to position the flow channel component 12 when it is assembled on the plate 11. The auxiliary assembly tool 50 can assist in positioning the flow channel component 12 when the flow channel component 12 is assembled, thereby improving the assembly accuracy, so that the flow channel component 12 is more accurately assembled at a preset position, avoiding the problem of uneven electrolyte distribution caused by the misalignment of the flow channel 13 during assembly, improving battery performance, and improving the reliability and convenience of assembly.

[0021] It should be noted that the electrode plate 11 is a electrode plate in a liquid flow battery, and the plate body 51 in the auxiliary assembly tool 50 can be constructed in any appropriate form according to actual needs. For example, the plate body 51 can be constructed to be exactly the same shape and size as the electrode plate 11, and when the plate body 51 is attached to one side of the electrode plate 11, the plate body 51 and the electrode plate 11 can completely overlap. The positioning hole 52 on the electrode plate 11 can be opened according to the shape of the flow channel component 12, so that when the flow channel component 12 is inserted into the positioning hole 52, the side wall of the flow channel component 12 is attached to the inner wall of the positioning hole 52. Therefore, the position of the positioning hole 52 on the plate body 51 is equivalent to the position when the flow channel component 12 is assembled on the electrode plate 11. The plate body 51 is attached to the electrode plate 11, and the position on the electrode plate 11 corresponding to the positioning hole 52 is the position where the flow channel component 12 is assembled on the electrode plate 11. When the plate body 51 is attached to the electrode plate 11, the flow channel component 12 can be assembled at the specified position only through the positioning hole 52. The assembly accuracy is high, the operation is convenient, and the problem of uneven electrolyte distribution caused by misalignment of the flow channel 13 during assembly can be avoided, thereby improving battery performance and assembly reliability.

[0022] In some embodiments, the flow channel component 12 may be mounted on one side of the electrode plate 11, or one flow channel component 12 may be mounted on two opposite sides of the electrode plate 11. When one flow channel component 12 is required to be mounted on both opposite sides of the electrode plate 11, the number of the plate bodies 51 in the auxiliary assembly tool 50 may be two, and the two plate bodies 51 are respectively attached to the opposite sides of the electrode plate 11. Two flow channel components 12 may be prepared, one of the two flow channel components 12 is mounted on one side of the electrode plate 11 through the positioning hole 52 of one plate body 51, and the other of the two flow channel components 12 is mounted on the other side of the electrode plate 11 through the positioning hole 52 of the other plate body 51, so as to realize the assembly of the opposite sides of the electrode plate 11.

[0023] In addition, it should be understood that the electrode plate 11 is provided with a electrode plate 11 liquid flow hole for the electrolyte in the liquid flow battery to flow. Therefore, in order to facilitate the positioning of the plate body 51 when it is attached to the electrode plate 11, a positioning structure 53 can be provided on the plate body 51, and the positioning structure 53 is used to be inserted into the electrode plate liquid flow hole 14 of the electrode plate 11.

[0024] In some embodiments, as mentioned above, when the flow channel components 12 need to be installed on both opposite sides of the electrode plate 11, two plate bodies 51 need to be respectively attached to the opposite sides of the electrode plate 11. Among them, positioning structures 53 are provided on both plate bodies 51, one of the two positioning structures 53 is configured as a first positioning cylinder 53a, and the other is configured as a second positioning cylinder 53b. The first positioning cylinder 53a is used to be inserted into the electrode plate liquid flow hole 14 of the electrode plate 11, and the second positioning cylinder 53b is inserted into the first positioning cylinder 53a, so as to facilitate the positioning of the two plate bodies 51 when they are respectively attached to the opposite sides of the electrode plate 11.

[0025] In the above embodiment, when the first positioning tube 53a is inserted into the electrode plate liquid flow hole 14, the outer wall of the first positioning hole 52 is in contact with the inner wall of the electrode plate liquid flow hole 14, and when the second positioning tube 53b is inserted into the first positioning tube 53a, the outer wall of the second positioning tube 53b is in contact with the inner wall of the first positioning tube 53a.

[0026] The second aspect of the present disclosure provides a method for assembling a plate assembly, wherein the flow channel component is assembled to the plate by using the auxiliary assembly tool provided in the first aspect of the present disclosure, such as Fig.12 As shown, the assembly method of the plate assembly includes: S100, attaching a plate body of an auxiliary assembly tool to at least one of two opposite surfaces of the electrode plate; S200, fixing the flow channel component to the electrode plate through the positioning hole; S300, Removal aid tool.

[0027] The flow channel component is assembled to the electrode plate through the above-mentioned assembly method of the electrode plate assembly. Compared with the prior art of directly opening the flow channel groove on the electrode plate, the operation is simpler. In addition, the electrode plate 11 and the flow channel component 12 are manufactured separately, which makes the design of the shape of the flow channel component 12 more flexible and easier to design the flow channel component 12 into a required shape, so that the flow channel 13 formed by the flow channel component 12 being bonded to the electrode plate 11 is more diverse.

[0028] In addition, when the flow channel member 12 is assembled to the electrode plate 11 by the assembly method, an auxiliary assembly tool can be used for positioning, thereby improving assembly accuracy and avoiding misalignment of the flow channel 13 during assembly, thereby avoiding the problem of uneven electrolyte distribution caused by misalignment of the flow channel 13. The reliability and convenience of assembly can also be improved.

[0029] In the above method, in step S100, the plate body 51 of the auxiliary assembly tool may be attached to at least one of the two opposite surfaces of the electrode plate 11, which may include two situations: the plate body 51 may be attached to one surface of the electrode plate 11; or the plate body 51 may be attached to both surfaces of the electrode plate 11.

[0030] It should be noted that when one surface of the electrode plate 11 needs to be attached to the plate body 51, the positioning structure 53 on the plate body 51 is inserted into the electrode plate liquid flow hole 14, and the plate body 51 is attached to the surface of the electrode plate 11. This positioning structure 53 can be constructed as a first positioning cylinder 53a, which is not limited here, and can be used for positioning when the plate body 51 is attached to the electrode plate 11. When both surfaces of the electrode plate 11 need to be attached to the plate body 51, as described under the theme of the auxiliary assembly tool in the present disclosure, two plate bodies 51 can be prepared, and the first positioning cylinder 53a of one of the two plate bodies 51 is first inserted into the electrode plate liquid flow hole 14, and the plate body 51 is attached to one surface of the electrode plate 11, and the second positioning cylinder 53b of the other of the two plate bodies 51 is inserted into the first positioning cylinder 53a, and the plate body 51 is attached to the other surface of the electrode plate 11, so that the two plate bodies 51 of the auxiliary assembly tool 50 are respectively attached to the two opposite surfaces of the electrode plate 11. Then, the two flow channel members 12 are respectively bonded to the opposite sides of the electrode plate 11 through the respective positioning holes 52 of the two plate bodies 51 .

[0031] In some embodiments, Fig.13 As shown, in the above assembly method, the specific steps of fixing the flow channel member 12 to the electrode plate 11 through the positioning hole 52 include: S201, applying adhesive to the electrode plate through the positioning hole; S202, bonding the flow channel component to the electrode plate through the positioning hole; S203, placing the bonded electrode plates and flow channel components on a pressurizing machine for pressurization; S204, placing the bonded electrode plates and flow channel components in an oven for drying and curing.

[0032] In the above method, the adhesive 15 is applied to the electrode 11 through the positioning hole 52, which is more convenient for positioning the adhesive 15 when applied, and is more convenient for applying the adhesive 15 to the specified position on the electrode 11. Then, the flow channel component 12 is bonded to the electrode through the positioning hole 52, which is also more convenient for positioning the flow channel component 12 when assembled to the electrode 11, and the assembly accuracy of the flow channel component 12 can be improved.

[0033] In addition, if Fig.14 As shown, when the auxiliary disassembly and assembly tool 50 is not removed, the electrode plate 11 and the flow channel component 12 bonded together are pressurized and dried and cured, which can avoid the electrode plate 11 and the flow channel component 12 bonded together from being misaligned during the pressurization and drying and curing process, so as to ensure the bonding quality between the electrode plate 11 and the flow channel component 12, and make the flow channel component 12 and the electrode plate 11 bonded together more firmly.

[0034] It should be noted that the adhesive 15 can also bond the electrode plate 11 and the flow channel member 12 by one or more of dispensing, printing, spraying, 3D printing, and sputtering, which are not limited here.

[0035] The thickness of the adhesive 15 is 5 μm-100 μm, preferably 10 μm-30 μm, so as to better bond the flow channel component 12 to the electrode plate 11 .

[0036] In the above assembly method, the pressure range of the bonded plate and flow channel member on the pressurizer is 10kPa~150kPa, preferably 20kP~50kPa; the pressurization time is 10min~240min, preferably 40min~120min, which can make the bubble discharge effect in the adhesive 15 better, the adhesive 15 more uniform, and the contact between the adhesive 15 and the flow channel member 12 and the plate 11 more uniform. The temperature of the plate and the flow channel member placed in the oven for drying and curing is 35℃~150℃, preferably 60℃~100℃; the drying and curing time is 1~18 hours, preferably 4~10 hours, which can make the bonding quality of the adhesive 15 after drying and curing higher. By limiting the pressure of the bonded plate and the flow channel member, the pressurization time, the temperature of the drying and curing in the oven, and the drying and curing time in the oven, the adhesive can better and more firmly bond the flow channel member to the plate.

[0037] In some embodiments, the electrode plates and flow channel components bonded together may be dried and cured by ultraviolet irradiation, which is not limited here.

[0038] In addition, if Figure 1 As shown, the flow channel member 12 is composed of solid ribs. When the flow channel member 12 is bonded to the surface of the electrode plate 11, a flow channel 13 is formed between the flow channel member 12 and the electrode plate 11 to guide the flow of the electrolyte.

[0039] The third aspect of the present disclosure provides a plate assembly, which is assembled based on the assembly method provided in the second aspect of the present disclosure, such as Figure 1 , Figure 7 and Figure 8 As shown, the plate assembly 10 includes a plate 11, at least one flow channel component 12 and an adhesive 15. At least one flow channel component 12 is bonded to the plate 11 by the adhesive 15. The adhesive 15 is a non-metallic conductive adhesive 15. The adhesive 15 includes a conductive component, an adhesive component and a solvent component.

[0040] Among them, the conductive component includes one or more of carbon nanotubes, graphene, carbon black, Ketjen black, acetylene black, and graphite; the adhesive component includes one or more of polytetrafluoroethylene, polyvinylidene fluoride (PVDF), sodium carboxymethyl cellulose, and polyurethane; the solvent component includes one or more of water, N-methylpyrrolidone, N-dimethylformamide, acetone, ethanol, methanol, and isopropanol.

[0041] In the above embodiment, the adhesive 15 is a non-metallic adhesive, and the electrode plate 11 and the flow channel member 12 are bonded by the non-metallic adhesive, and the composition of the adhesive 15 will not affect the reaction of the electrolyte. The conductive component, the adhesive component and the solvent component in the adhesive 15 are made of the above materials, so that the adhesive 15 can bond the flow channel member 12 and the electrode plate 11 on the one hand, and conduct electricity on the other hand.

[0042] In some embodiments, the adhesive 15 includes polyvinylidene fluoride (PVDF), carbon nanotubes, water, and N-methylpyrrolidone, wherein the mass ratio of polyvinylidene fluoride to the carbon nanotubes is (5-15): (85-95), so that the adhesive 15 has both good adhesion and good conductivity.

[0043] It should be noted that the structure of the flow channel member 12 is not limited and can be arbitrarily constructed according to actual needs. When the flow channel member 12 is bonded to the electrode plate 11, the flow channel 13 formed between the flow channel member 12 and the electrode plate 11 can be serpentine, U-shaped, or interdigitated. Figure 1 As shown, the flow channel 13 is an interdigitated flow channel.

[0044] In addition, in some possible implementations, the flow channel member 12 may also be hollowed out, which is not limited here.

[0045] In some embodiments, the flow channel member 12 is made of one of flexible graphite, graphite plate, carbon composite plate, carbon felt or carbon cloth; the thickness of the flow channel member 12 is 0.5 mm to 5 mm, and the density of the flow channel member 12 is 0.5 g / cm 3 ~3g / cm 3 . So that the flow channel 13 and 12 have better conductivity and mechanical strength.

[0046] In the above embodiment, the flow channel member 12 is bonded to the electrode plate 11 by the above adhesive 15, which can reduce the contact internal resistance, lower the ohmic polarization, and improve the battery performance.

[0047] like Figure 1 As shown, when the flow channel member 12 is bonded to the electrode plate 11, the number of flow channels 13 formed can be set according to actual needs. For example, when the flow channel member 12 is bonded to the electrode plate 11, the number of liquid inlets or the number of liquid outlets of the formed flow channel 13 can be 1 to 50, that is, the number of flow channels 13 can be 1 to 50, so as to facilitate a more uniform distribution of the electrolyte, so that the electrolyte can penetrate into the interior of the electrode 30 more evenly.

[0048] In addition, the rib width d of the flow channel member 12 may be 2 mm to 30 mm, preferably 10 mm to 20 mm, which may improve the fluidity of the electrolyte.

[0049] The fourth aspect of the present disclosure provides a liquid flow battery, comprising the electrode plate assembly 10 provided in the third aspect above, wherein the liquid flow battery comprises a plurality of single cells.

[0050] In some embodiments, Figure 7 and Figure 8 As shown, the single cell includes an electrode frame 20, a separator 40, two electrodes 30 and two electrode plate assemblies 10. The two electrode plate assemblies 10 are respectively a first electrode plate assembly 10a and a second electrode plate assembly 10b, the two electrodes 30 are respectively a first electrode 31 and a second electrode 32, and the electrode frame 20 includes a first frame body 21 and a second frame body 22. The first electrode plate assembly 10a includes a first electrode plate 11a and two first flow channel components 12a respectively mounted on opposite sides of the first electrode plate 11a, and the second electrode plate assembly 10b includes a second electrode plate 11b and two second flow channel components 12b respectively mounted on opposite sides of the second electrode plate 11b.

[0051] The first frame 21 and the second frame 22 are buckled to form the electrode frame 20, and the isolation film 40 is clamped between the first frame 21 and the second frame 22. The first frame 21 includes a first frame opening 214, and the first electrode 31 is arranged in the first frame opening 214 of the first frame 21. The first electrode 11a of the first electrode plate assembly 10a is attached to the first frame 21, and a first flow channel component 12a on the first electrode plate 11a is attached to the first electrode 31. The second frame 22 includes a second frame opening 224, and the second electrode 32 is arranged in the second frame opening 224. The second electrode 11b of the second electrode plate assembly 10b is attached to the second frame 22, and a second flow channel component 12b on the second electrode plate 11b is attached to the second electrode 32, so as to form a single cell.

[0052] like Figure 7 and Figure 8 As shown, the four corners of the first electrode plate 11a are respectively provided with a first electrode plate liquid flow hole 14a, the four corners of the first frame 21 are respectively provided with a first frame liquid flow hole 213, the four corners of the isolation membrane 40 are respectively provided with an isolation membrane liquid flow hole 41, the four corners of the second frame 22 are respectively provided with a second frame liquid flow hole 223, and the four corners of the second electrode plate 11b are respectively provided with a second electrode plate liquid flow hole 14b. When the single cell is in an assembled state, the corresponding first electrode plate liquid flow hole 14a, the first frame liquid flow hole 213, the isolation membrane liquid flow hole 41, the second frame liquid flow hole 223 and the second electrode plate liquid flow hole 14b are connected to form four electrolyte main channels in the single cell. Two of the four electrolyte main channels can be the positive electrode electrolyte main inlet channel and the positive electrode electrolyte main outlet channel, and the other two are the negative electrode electrolyte main inlet channel and the negative electrode electrolyte main outlet channel. The positive electrode electrolyte and the negative electrode electrolyte are respectively introduced into the two sides of the isolation membrane 40 in the single cell.

[0053] like Figures 8 to 11 As shown, the first frame 21 is provided with a first liquid inlet flow path 211 and a first liquid outlet flow path 212, and the first frame liquid flow hole 213 includes a first frame liquid inlet hole 213a and a first frame liquid outlet hole 213b. The first frame liquid inlet hole 213a is connected to the first liquid inlet flow path 211, and the first frame liquid outlet hole 213b is connected to the first liquid outlet flow path 212. Assuming that the liquid passing through the first frame liquid inlet hole 213a is a positive electrode electrolyte, the positive electrode electrolyte enters the first electrode 31 in the first frame opening 214 through the first frame liquid inlet hole 213a and the first liquid inlet flow path 211, and the positive electrode electrolyte flows out through the first liquid outlet flow path 212 and the first frame liquid outlet hole 213b after passing through the first electrode 31.

[0054] The second frame 22 is provided with a second liquid inlet flow path 221 and a second liquid outlet flow path 222, and the second frame liquid flow hole 223 includes a second frame liquid inlet hole 223a and a second frame liquid outlet hole 223b. The second frame liquid inlet hole 223a is connected to the second liquid inlet flow path 221, and the second frame liquid outlet hole 223b is connected to the second liquid outlet flow path 222. Assuming that the liquid passing through the second frame liquid inlet hole 223a is a negative electrode electrolyte, the negative electrode electrolyte enters the second electrode 32 in the second frame opening 224 through the second frame liquid inlet hole 223a and the second liquid inlet flow path 221, and the negative electrode electrolyte flows out through the second liquid outlet flow path 222 and the second frame liquid outlet hole 223b after passing through the second electrode 32.

[0055] When the single cells are assembled together, the first flow channel member 12a of the first electrode assembly 10a facing the first electrode 31 is attached to the first electrode 31 to seal the flow channel 13 formed by the first flow channel member 12a and the first electrode plate 11a; the second flow channel member 12b of the second electrode assembly 10b facing the second electrode 32 is attached to the second electrode 32 to seal the flow channel 13 formed by the first flow channel member 12a and the second electrode plate 11b. Figure 7 and Figure 8 As shown, the first flow channel member 12a and the second flow channel member 12b have the same shape, and the shape of the flow channel 13 formed between the first flow channel member 12a and the first electrode plate 11a and the shape of the flow channel 13 formed between the second flow channel member 12b and the second electrode plate 11b are the same. Here, the flow mode of the electrolyte between the first electrode 31 and the flow channel 13 of the first electrode plate assembly 10a is described.

[0056] like Figures 9 to 11As shown, the flow channel 13 is constructed as an interdigitated type, and the flow channel 13 includes an inlet flow channel 131 and an outlet flow channel 132. The electrolyte entering from the first frame inlet hole 213a passes through the first inlet flow path 211 and enters the inlet flow channel 131 on the first electrode assembly 10a. Then, the electrolyte in the inlet flow channel 131 on the first electrode assembly 10a penetrates into the first electrode 31. After passing through the first electrode 31, the electrolyte enters the outlet flow channel 132 on the first electrode assembly 10a. Then, the electrolyte enters the first frame outlet hole 213b through the outlet flow channel 132 on the first electrode assembly 10a and flows out from the first frame outlet hole 213b. Among them, Fig.11 The arrow in the middle indicates the flow direction of the electrolyte.

[0057] The flow mode of the electrolyte between the second electrode 32 and the flow channel 13 of the second electrode plate assembly 10 b is the same as the flow mode of the electrolyte between the first electrode 31 and the flow channel 13 of the first electrode plate assembly 10 a .

[0058] In some embodiments, the electrolyte entering through the second frame liquid inlet hole 223a enters the liquid inlet channel 131 on the second electrode plate assembly 10b through the second liquid inlet path 221, and then the electrolyte in the liquid inlet channel 131 on the second electrode plate assembly 10b penetrates into the second electrode 32, and the electrolyte enters the liquid outlet channel 132 on the second electrode plate assembly 10b after passing through the second electrode 32, and then the electrolyte enters the second frame liquid outlet hole 223b through the liquid outlet channel 132 on the second electrode plate assembly 10b and flows out from the second frame liquid outlet hole 223b.

[0059] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0060] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0061] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An auxiliary assembly tool for a plate assembly, characterized in that: Used to assist the flow channel component in assembling the electrode plate, the auxiliary assembly tool includes a plate body and a positioning hole provided on the plate body, the plate body is used to fit the electrode plate, and the positioning hole is used to position the flow channel component when it is assembled on the electrode plate.

2. The auxiliary assembly tool according to claim 1, characterized in that: The number of the plate bodies is two, and the two plate bodies are respectively used to fit on two opposite sides of the electrode plate.

3. The auxiliary assembly tool according to claim 1 or 2, characterized in that: The plate body is provided with a positioning structure, and the positioning structure is used to be plugged into the plate liquid flow hole of the plate.

4. The auxiliary assembly tool according to claim 2, characterized in that: Both plate bodies are provided with positioning structures, one of the two positioning structures is configured as a first positioning tube, and the other is configured as a second positioning tube, the first positioning tube is used to be inserted into the electrode plate liquid flow hole of the electrode plate, and the second positioning tube is inserted into the first positioning tube.

5. A method for assembling a plate assembly, characterized in that: The flow channel component is assembled to the electrode plate by using the auxiliary assembly tool as described in any one of claims 1 to 4, and the assembly method of the electrode plate assembly includes: Adhere the plate body of the auxiliary assembly tool to at least one of two opposite surfaces of the electrode plate; Fixing the flow channel component to the electrode plate through the positioning hole; Disassemble the auxiliary assembly tool.

6. The method for assembling a plate assembly according to claim 5, characterized in that: The specific steps of fixing the flow channel component to the electrode plate through the positioning hole include: Applying adhesive to the electrode plate through the positioning hole; Bonding the flow channel component to the electrode plate through the positioning hole; Placing the electrode plate and the flow channel member bonded together on a press to apply pressure; The electrode plate and the flow channel member bonded together are placed in an oven for drying and curing.

7. A plate assembly, characterized in that: The electrode assembly is assembled based on the assembly method of the electrode assembly according to claim 5 or 6, wherein the electrode assembly comprises an electrode, at least one flow channel component and an adhesive, wherein the at least one flow channel component is bonded to the electrode through the adhesive; the adhesive comprises a conductive component, an adhesive component and a solvent component; The conductive component includes one or more of carbon nanotubes, graphene, carbon black, Ketjen black, acetylene black, and graphite; The bonding component includes one or more of polytetrafluoroethylene, polyvinylidene fluoride, sodium carboxymethyl cellulose, and polyurethane; The solvent component includes one or more of water, N-methylpyrrolidone, N-dimethylformamide, acetone, ethanol, methanol, and isopropanol.

8. The electrode plate assembly according to claim 7, characterized in that: The adhesive includes polyvinylidene fluoride, carbon nanotubes, water, and N-methylpyrrolidone; Wherein, the mass ratio of the polyvinylidene fluoride to the carbon nanotubes is (5-15): (85-95).

9. The electrode plate assembly according to claim 7, characterized in that: The flow channel member is made of one of flexible graphite, graphite plate, carbon composite plate, carbon felt or carbon cloth; and The thickness of the flow channel part is 0.5-5 mm, and the density of the flow channel part is 0.5-3 g / cm 3 .

10. A liquid flow battery, characterized in that: Comprising a plate assembly as described in any one of claims 7-9.

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