High-energy-efficiency flow battery, battery stack and flow battery system

Abstract

The utility model discloses a high-energy-efficiency flow battery, a battery stack and a flow battery system, the high-energy-efficiency flow battery comprises a first fixed end plate, a first liquid inlet plate, a first collector plate, a first bipolar plate, a positive electrode frame, a positive electrode cover plate, an ion exchange membrane, a negative electrode cover plate, a negative electrode frame, a second bipolar plate, a second collector plate, a second liquid inlet plate and a second fixed end plate which are sequentially stacked, a positive electrode is arranged in the positive electrode accommodating cavity, a negative electrode accommodating cavity is formed in the negative electrode frame, and a negative electrode is arranged in the negative electrode accommodating cavity; a positive electrode liquid inlet runner and a positive electrode liquid outlet runner which are distributed in a central symmetry manner are arranged on the inner side of the positive electrode frame, and a negative electrode liquid inlet runner and a negative electrode liquid outlet runner which are distributed in a central symmetry manner are arranged on the inner side of the negative electrode frame. According to the utility model, the dead zone area can be reduced, the energy efficiency is effectively improved, the whole structure is simple, the processing is easy, and the production efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the field of flow battery technology, and in particular to a high-efficiency flow battery, a battery stack, and a flow battery system. Background Technology

[0002] In recent years, the large-scale consumption of fossil fuels has led to increased greenhouse gas emissions, resulting in a growing demand for renewable energy. However, renewable energy sources such as wind and solar power are characterized by instability and discontinuity, requiring large-scale energy storage systems for grid connection. Among available energy storage solutions, electrochemical energy storage technology is considered the most economical and practical choice. Among numerous electrochemical energy storage technologies, vanadium redox flow batteries have attracted widespread attention due to their high safety, energy and power separation, long cycle life, and deep charge / discharge capability.

[0003] Currently, existing flow batteries typically use a rectangular structure for ease of manufacturing. However, in rectangular structures, the electrolyte flow rate is relatively slow, which can easily lead to dead zones and polarization reactions, resulting in reduced energy efficiency. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a high-efficiency flow battery, a battery stack and a flow battery system.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] According to a first aspect of the present disclosure, a high-efficiency flow battery is provided, comprising a first fixed end plate, a first liquid inlet plate, a first current collector plate, a first bipolar plate, a positive electrode frame, a positive electrode cover plate, an ion exchange membrane, a negative electrode cover plate, a negative electrode frame, a second bipolar plate, a second current collector plate, a second liquid inlet plate, and a second fixed end plate stacked sequentially. The positive electrode frame has a positive electrode cavity, and the positive electrode cavity has a positive electrode. The negative electrode frame has a negative electrode cavity, and the negative electrode cavity has a negative electrode.

[0007] The inner side of the positive electrode frame is provided with a positive electrode liquid inlet channel and a positive electrode liquid outlet channel that are centrally symmetrically distributed. Both the positive electrode liquid inlet channel and the positive electrode liquid outlet channel are L-shaped and extend at least to one side of the positive electrode cavity. The inner side of the negative electrode frame is provided with a negative electrode liquid inlet channel and a negative electrode liquid outlet channel that are centrally symmetrically distributed. Both the negative electrode liquid inlet channel and the negative electrode liquid outlet channel are L-shaped and extend at least to one side of the negative electrode cavity.

[0008] After entering through the first fixed end plate, the positive electrode electrolyte passes sequentially through the first inlet plate, the first current collector, the first bipolar plate, and the positive electrode frame. After being guided and diffused by the positive electrode inlet channel, it enters from the first side of the positive electrode to participate in the reaction, then flows from the second side of the positive electrode to the positive electrode outlet channel and flows out. It then passes sequentially through the positive electrode cover plate, the ion exchange membrane, the negative electrode cover plate, the negative electrode frame, the second bipolar plate, the second current collector, the second inlet plate, and the second fixed end plate before flowing out.

[0009] After entering through the second fixed end plate, the negative electrode electrolyte passes sequentially through the second inlet plate, the second current collector, the second bipolar plate, and the negative electrode frame. After being guided and diffused by the negative electrode inlet channel, it enters from the first side of the negative electrode to participate in the reaction, then flows from the second side of the negative electrode to the negative electrode outlet channel and flows out. It then passes sequentially through the negative electrode cover plate, the ion exchange membrane, the positive electrode cover plate, the positive electrode frame, the first bipolar plate, the first current collector, the first inlet plate, and the first fixed end plate before flowing out.

[0010] The above technical solution is achieved by setting up positive electrode inlet channel, positive electrode outlet channel, negative electrode inlet channel and negative electrode outlet channel, and the positive electrode inlet channel and positive electrode outlet channel are centrally symmetrically distributed, which allows the electrolyte to enter the positive electrode and negative electrode from the side, thereby reducing the dead zone area, effectively improving energy efficiency, and the overall structure is simple, easy to process, and can improve production efficiency.

[0011] In some exemplary embodiments, a first positive electrode liquid inlet is provided on the first fixed end plate, a second positive electrode liquid inlet is correspondingly provided on the first liquid inlet plate, a third positive electrode liquid inlet is correspondingly provided on the first current collector plate, a fourth positive electrode liquid inlet is correspondingly provided on the first bipolar plate, and a fifth positive electrode liquid inlet is correspondingly provided on the positive electrode frame.

[0012] The fifth positive electrode liquid inlet is connected to one end of the positive electrode liquid inlet channel, and the positive electrode liquid inlet channel is also provided with a plurality of positive electrode liquid inlet slots connected to the positive electrode cavity. One end of the positive electrode liquid outlet channel is connected to the first positive electrode liquid outlet, and the positive electrode liquid outlet channel is also provided with a plurality of positive electrode liquid outlet slots connected to the positive electrode cavity.

[0013] The positive electrode cover plate is provided with a second positive electrode outlet, the ion exchange membrane is provided with a third positive electrode outlet, the negative electrode cover plate is provided with a fourth positive electrode outlet, the negative electrode frame is provided with a fifth positive electrode outlet, the second bipolar plate is provided with a sixth positive electrode outlet, the second current collector is provided with a seventh positive electrode outlet, the second inlet plate is provided with an eighth positive electrode outlet, and the second fixed end plate is provided with a ninth positive electrode outlet.

[0014] The positive electrode electrolyte enters from the fifth positive electrode outlet and the positive electrode inlet, and after participating in the reaction at the positive electrode, it flows out from the first positive electrode outlet and the positive electrode outlet.

[0015] The above technical solution enables the flow of positive electrode electrolyte.

[0016] In some exemplary embodiments, a first negative electrode inlet is provided on the second fixed end plate, a second negative electrode inlet is correspondingly provided on the second inlet plate, a third negative electrode inlet is correspondingly provided on the second current collector plate, a fourth negative electrode inlet is correspondingly provided on the second bipolar plate, and a fifth negative electrode inlet is correspondingly provided on the negative electrode frame.

[0017] The fifth negative electrode inlet is connected to one end of the negative electrode inlet channel, and the negative electrode inlet channel is also provided with a plurality of negative electrode inlet slots connected to the negative electrode cavity. One end of the negative electrode outlet channel is connected to the first negative electrode outlet, and the negative electrode outlet channel is also provided with a plurality of negative electrode outlet slots connected to the negative electrode cavity.

[0018] The negative electrode cover plate is provided with a second negative electrode outlet, the ion exchange membrane is provided with a third negative electrode outlet, the positive electrode cover plate is provided with a fourth negative electrode outlet, the positive electrode frame is provided with a fifth negative electrode outlet, the second bipolar plate is provided with a sixth negative electrode outlet, the second current collector is provided with a seventh negative electrode outlet, the second inlet plate is provided with an eighth negative electrode outlet, and the second fixed end plate is provided with a ninth negative electrode outlet.

[0019] The negative electrode electrolyte enters from the fifth negative electrode outlet and the negative electrode inlet, and after participating in the reaction at the negative electrode, it flows out from the first negative electrode outlet and the negative electrode outlet.

[0020] The above technical solution enables the flow of negative electrode electrolyte.

[0021] In some exemplary embodiments, the positive electrode inlet and the positive electrode outlet are located at the four corners of the positive electrode cavity, respectively; the negative electrode inlet and the negative electrode storage outlet are located at the four corners of the negative electrode cavity, respectively.

[0022] By implementing the above technical solution, the electrolyte can be more evenly distributed to the positive and negative electrodes, thereby further improving energy efficiency.

[0023] In some exemplary embodiments, a first spacer is provided on the positive electrode frame at the center of the positive electrode cavity, and a second spacer is provided on the negative electrode frame at the center of the negative electrode cavity.

[0024] The above technical solution is achieved by using the first and second spacers to prevent cross-contamination of the electrolyte, thereby further improving energy efficiency.

[0025] In some exemplary embodiments, the positive electrode cover plate is provided with a first rib corresponding to the first spacer, and the negative electrode cover plate is provided with a second rib corresponding to the second spacer.

[0026] The above technical solution ensures that the positive and negative electrolytes do not interact after shunting.

[0027] In some exemplary embodiments, the outer periphery of the first fixed end plate and the second fixed end plate are respectively provided with corresponding first locking holes and second locking holes.

[0028] To achieve the above technical solution, the first fixed end plate and the second fixed end plate are locked and fixed by installing bolt assemblies through the first locking hole and the second locking hole.

[0029] According to a second aspect of the present disclosure, a battery stack is provided, comprising a plurality of circular flow batteries as described in the first aspect, wherein each of the circular flow batteries is connected in series in sequence.

[0030] According to a third aspect of the present disclosure, a flow battery system is provided, comprising:

[0031] The battery stack as described in the second aspect;

[0032] A positive electrode storage tank is used to store positive electrode electrolyte and is connected to the first fixed end plate via a first infusion pump.

[0033] The negative electrode storage tank is used to store the negative electrode electrolyte and is connected to the second fixed end plate through the second infusion pump.

[0034] In summary, compared with the prior art, this utility model has the following beneficial effects:

[0035] This utility model provides a high-efficiency flow battery, battery stack, and flow battery system. Because it incorporates a positive electrode inlet channel, a positive electrode outlet channel, a negative electrode inlet channel, and a negative electrode outlet channel, with the positive and negative electrode inlet and outlet channels centrally symmetrically distributed, the electrolyte can enter the positive and negative electrodes from the sides. This reduces the dead zone area, effectively improving energy efficiency. Furthermore, the overall structure is simple, easy to process, and improves production efficiency. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the high-efficiency flow battery in an embodiment of this utility model.

[0037] Figure 2 This is an exploded schematic diagram of the high-efficiency flow battery in an embodiment of this utility model.

[0038] Figure 3 This is an exploded view of the high-efficiency flow battery in this embodiment of the present invention.

[0039] Figure 4 This is a schematic diagram of the structure of the positive electrode frame in an embodiment of this utility model.

[0040] Figure 5 This is a schematic diagram of the negative electrode frame in an embodiment of the present invention.

[0041] Figure 6 This is a schematic diagram of the flow battery system in an embodiment of the present invention.

[0042] The numbers and letters in the diagram represent the names of the corresponding components:

[0043] 10. First fixed end plate; 101. First positive electrode inlet; 102. Ninth negative electrode outlet; 103. First locking hole; 11. First inlet plate; 111. Second positive electrode inlet; 112. Eighth negative electrode outlet; 12. First collector plate; 121. Third positive electrode inlet; 122. Seventh negative electrode outlet; 13. First bipolar plate; 131. Fourth positive electrode inlet; 132. Sixth negative electrode outlet; 14. Positive electrode frame; 141. Positive electrode; 142. Positive electrode cavity 143. Fifth positive electrode inlet; 144. First positive electrode outlet; 145. Fifth negative electrode outlet; 146. First spacer; 147. Positive electrode inlet channel; 1471. Positive electrode inlet trough; 148. Positive electrode outlet channel; 1481. Positive electrode outlet trough; 15. Positive electrode cover plate; 151. Second positive electrode outlet; 152. Fourth negative electrode outlet; 153. First rib; 16. Ion exchange membrane; 161. Third positive electrode outlet; 162. Third negative electrode outlet; 17. 171. Negative electrode cover plate; 172. Fourth positive electrode outlet; 173. Second negative electrode outlet; 174. Second partition rib; 18. Negative electrode frame; 185. Negative electrode; 186. Negative electrode cavity; 187. Fifth positive electrode outlet; 188. Fifth negative electrode inlet; 189. First negative electrode outlet; 180. Second partition bar; 181. Negative electrode inlet channel; 187. Negative electrode inlet groove; 188. Negative electrode outlet channel; 1881. Negative electrode outlet groove; 19. Second bipolar plate; 191 192. Sixth positive electrode outlet; 20. Fourth negative electrode inlet; 21. Second manifold; 221. Seventh positive electrode outlet; 222. Third negative electrode inlet; 223. Second inlet plate; 24. Eighth positive electrode outlet; 25. Second negative electrode inlet; 26. Second fixed end plate; 27. Ninth positive electrode outlet; 28. First negative electrode inlet; 29. ​​Second locking hole; 20. Positive electrode storage tank; 21. First infusion pump; 22. Negative electrode storage tank; 23. Second infusion pump. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0045] like Figures 1 to 5As shown, the first aspect of this utility model provides a high-efficiency flow battery, including a first fixed end plate 10, a first liquid inlet plate 11, a first current collector plate 12, a first bipolar plate 13, a positive electrode frame 14, a positive electrode cover plate 15, an ion exchange membrane 16, a negative electrode cover plate 17, a negative electrode frame 18, a second bipolar plate 19, a second current collector plate 20, a second liquid inlet plate 21, and a second fixed end plate 22 arranged in sequence. The positive electrode frame 14 is provided with a positive electrode cavity 142, and a positive electrode 141 is provided in the positive electrode cavity 142. The negative electrode frame 18 is provided with a negative electrode cavity 182, and a negative electrode 181 is provided in the negative electrode cavity 182.

[0046] The positive electrode frame 14 has a positive electrode inlet channel 147 and a positive electrode outlet channel 148 arranged in a centrally symmetrical manner on its inner side. Both the positive electrode inlet channel 147 and the positive electrode outlet channel 148 are L-shaped and extend at least to one side of the positive electrode cavity 142. The negative electrode frame 18 has a negative electrode inlet channel 187 and a negative electrode outlet channel 188 arranged in a centrally symmetrical manner on its inner side. Both the negative electrode inlet channel 187 and the negative electrode outlet channel 188 are L-shaped and extend at least to one side of the negative electrode cavity 182.

[0047] After entering through the first fixed end plate 10, the positive electrode electrolyte passes sequentially through the first inlet plate 11, the first current collector 12, the first bipolar plate 13, and the positive electrode frame 14. After being guided and diffused through the positive electrode inlet channel 147, it enters from the first side of the positive electrode 141 to participate in the reaction, and then flows from the second side of the positive electrode 141 to the positive electrode outlet channel 148 before flowing out. It then passes sequentially through the positive electrode cover plate 15, the ion exchange membrane 16, the negative electrode cover plate 17, the negative electrode frame 18, the second bipolar plate 19, the second current collector 20, the second inlet plate 21, and the second fixed end plate 22 before flowing out.

[0048] After entering through the second fixed end plate 22, the negative electrode electrolyte passes sequentially through the second inlet plate 21, the second current collector 20, the second bipolar plate 19, and the negative electrode frame 18. After being guided and diffused through the negative electrode inlet channel 187, it enters from the first side of the negative electrode 181 to participate in the reaction. Then, it flows from the second side of the negative electrode 181 to the negative electrode outlet channel 188 and flows out. It then passes sequentially through the negative electrode cover plate 17, the ion exchange membrane 16, the positive electrode cover plate 15, the positive electrode frame 14, the first bipolar plate 13, the first current collector 12, the first inlet plate 11, and the first fixed end plate 10 before flowing out.

[0049] Specifically, the first fixed end plate 10 is provided with a first positive electrode liquid inlet 101, the first liquid inlet plate 11 is provided with a second positive electrode liquid inlet 111, the first current collector plate 12 is provided with a third positive electrode liquid inlet 121, the first bipolar plate 13 is provided with a fourth positive electrode liquid inlet 131, and the positive electrode frame 14 is provided with a fifth positive electrode liquid inlet 143.

[0050] The fifth positive electrode inlet 143 is connected to one end of the positive electrode inlet channel 147, and the positive electrode inlet channel 147 is also provided with a number of positive electrode inlet slots 1471 connected to the positive electrode cavity 142. One end of the positive electrode outlet channel 148 is connected to the first positive electrode outlet 144, and the positive electrode outlet channel 148 is also provided with a number of positive electrode outlet slots 1481 connected to the positive electrode cavity 142. The positive electrode electrolyte enters from the fifth positive electrode outlet 143 and the positive electrode inlet slot 1471, and after participating in the reaction at the positive electrode 141, it flows out from the first positive electrode outlet 144 and the positive electrode outlet slot 1481.

[0051] The positive electrode cover plate 15 is provided with a second positive electrode outlet 151, the ion exchange membrane 16 is provided with a third positive electrode outlet 161, the negative electrode cover plate 17 is provided with a fourth positive electrode outlet 171, the negative electrode frame 18 is provided with a fifth positive electrode outlet 183, the second bipolar plate 19 is provided with a sixth positive electrode outlet 191, the second current collector 20 is provided with a seventh positive electrode outlet 201, the second liquid inlet plate 21 is provided with an eighth positive electrode outlet 211, and the second fixed end plate 22 is provided with a ninth positive electrode outlet 221, thus realizing the flow of positive electrode electrolyte.

[0052] The second fixed end plate 22 is provided with a first negative electrode liquid inlet 222, the second liquid inlet plate 21 is provided with a corresponding second negative electrode liquid inlet 212, the second collector plate 20 is provided with a corresponding third negative electrode liquid inlet 202, the second bipolar plate 19 is provided with a corresponding fourth negative electrode liquid inlet 192, and the negative electrode frame 18 is provided with a corresponding fifth negative electrode liquid inlet 184.

[0053] The fifth negative electrode inlet 184 is connected to one end of the negative electrode inlet channel 187, and the negative electrode inlet channel 187 is also provided with a number of negative electrode inlet slots 1871 connected to the negative electrode cavity 182. One end of the negative electrode outlet channel 188 is connected to the first negative electrode outlet 185, and the negative electrode outlet channel 188 is also provided with a number of negative electrode outlet slots 1881 connected to the negative electrode cavity 182. The negative electrode electrolyte enters from the fifth negative electrode outlet 145 and the negative electrode inlet slot 1871, and after participating in the reaction with the negative electrode 181, it flows out from the first negative electrode outlet 185 and the negative electrode outlet slot 1881.

[0054] The negative electrode cover plate 17 is provided with a second negative electrode outlet 172, the ion exchange membrane 16 is provided with a third negative electrode outlet 162, the positive electrode cover plate 15 is provided with a fourth negative electrode outlet 152, the positive electrode frame 14 is provided with a fifth negative electrode outlet 145, the second bipolar plate 19 is provided with a sixth negative electrode outlet 132, the second current collector 20 is provided with a seventh negative electrode outlet 122, the second liquid inlet plate 21 is provided with an eighth negative electrode outlet 112, and the second fixed end plate 22 is provided with a ninth negative electrode outlet 102, thus realizing the flow of negative electrode electrolyte.

[0055] A first locking hole 103 and a second locking hole 223 are respectively provided near the edge of the outer periphery of the first fixed end plate 10 and the second fixed end plate 22. The first locking hole 103 and the second locking hole 223 are both through holes, and multiple holes are evenly arranged around the periphery. The diameter of the first locking hole 103 and the second locking hole 223 is 20-40mm. Preferably, the diameter of the first locking hole 103 and the second locking hole 223 is 20mm. The bolt assembly is installed through the first locking hole 103 and the second locking hole 223 to realize the locking and fixing of the first fixed end plate 10 and the second fixed end plate 22.

[0056] The thickness of the first fixed end plate 10 and the second fixed end plate 22 is 20-80mm, preferably 35mm. The diameter of the first positive electrode liquid inlet 101, the first negative electrode liquid inlet 222, the ninth negative electrode liquid outlet 102, and the ninth positive electrode liquid outlet 221 is 20-80mm, preferably 40mm. The thickness of the first liquid inlet plate 11 and the second liquid inlet plate 21 is 20-60mm, preferably 35mm. The second positive electrode liquid inlet 111, the second negative electrode liquid inlet 212, the eighth negative electrode liquid outlet 112, and the eighth positive electrode liquid outlet 211 are all countersunk through holes with a diameter 10-20mm smaller than that of the first positive electrode liquid inlet 101. The small hole diameter of the countersunk through hole is 20-80mm, and the large hole diameter is 5-20mm larger than the small hole diameter. Preferably, the depth of the countersunk through hole is 25mm, the small hole diameter is 25mm, and the large hole diameter is 30mm.

[0057] Both the first current collector 12 and the second current collector 20 are provided with tabs, and the tabs are provided with wiring holes for wiring. The diameter of the wiring holes is 5-30mm, preferably 10mm. The tabs are also provided with clearance holes corresponding to the first locking hole 103 and the second locking hole 223. The diameter of the clearance holes is 5-10mm larger than the diameter of the first locking hole 103, preferably 10mm larger than the diameter of the first locking hole 103. The thickness of the first bipolar plate 13 and the second bipolar plate 19 is 0.5-2mm, preferably 1mm. The thickness of the positive electrode cover plate 15 and the negative electrode cover plate 17 is also 0.5-2mm, preferably 1mm.

[0058] Furthermore, all components are sealed with a surface seal, and an EPDM film can be placed between the plates. The thickness of the EPDM film is 0.5-1mm, preferably 1mm.

[0059] In this embodiment, the positive electrode frame 14 and the negative electrode frame 18 have the same structure, the only difference being that the positive electrode liquid inlet channel 147 and the positive electrode liquid outlet channel 148 are arranged in opposite directions to the negative electrode liquid inlet channel 187 and the negative electrode liquid outlet channel 188. Taking the positive electrode frame 14 as an example, the positive electrode liquid inlet groove 1471 near the fifth positive electrode liquid inlet 143 is 3-10 mm smaller than the positive electrode liquid inlet groove 1471 far from the fifth positive electrode liquid inlet 143, preferably 7 mm. The positive electrode liquid outlet groove 1481 near the first positive electrode liquid outlet 144 is 3-10 mm smaller than the positive electrode liquid outlet groove 1481 far from the first positive electrode liquid outlet 144, preferably 7 mm. The groove depth of the positive electrode liquid inlet channel 147 and the positive electrode liquid outlet channel 148 is 1-3 mm, preferably 2.5 mm.

[0060] The positive electrode inlet 1471 and the positive electrode outlet 1481 are located at the four corners of the positive electrode cavity 142, respectively; the negative electrode inlet 1871 and the negative electrode storage outlet are located at the four corners of the negative electrode cavity 182, respectively, so that the electrolyte can be more evenly distributed to the positive electrode 141 and the negative electrode 181, thereby further improving energy efficiency.

[0061] A first spacer 146 is provided on the positive electrode frame 14 at the middle of the positive electrode cavity 142, and a second spacer 186 is provided on the negative electrode frame 18 at the middle of the negative electrode cavity 182. The positive electrode cavity 142 and the negative electrode cavity 182 are divided into two equal parts by the first spacer 146 and the second spacer 186. Correspondingly, two positive electrodes and two negative electrodes are also provided respectively. The first spacer 146 and the second spacer 186 prevent the electrolyte from crossing each other, thereby further improving the energy efficiency.

[0062] Meanwhile, the positive electrode cover plate 15 is provided with a first partition 153 corresponding to the first partition 146, and the negative electrode cover plate 17 is provided with a second partition 173 corresponding to the second partition 186, so that the positive electrode electrolyte and the negative electrode electrolyte will not interact after the current is split.

[0063] Because the positive electrode inlet channel 147, positive electrode outlet channel 148, negative electrode inlet channel 187, and negative electrode outlet channel 188 are provided, and the positive electrode inlet channel 147 and the positive electrode outlet channel 148 are centrally symmetrically distributed, and the negative electrode inlet channel 187 and the negative electrode outlet channel 188 are centrally symmetrically distributed, the electrolyte can enter the positive electrode 141 and the negative electrode 181 from the side, thereby reducing the dead area and effectively improving energy efficiency. Moreover, the overall structure is simple, easy to process, and can improve production efficiency.

[0064] The second aspect of this utility model provides a battery stack, including a plurality of high-efficiency flow batteries as described in the first aspect, wherein each circular flow battery is connected in series in sequence, and preferably the flow battery stack includes two or more sets of high-efficiency flow batteries connected in series.

[0065] A third aspect of this utility model provides a flow battery system, such as... Figure 6 As shown, it includes: a battery stack as described in the second aspect; a positive electrode storage tank 23 for storing positive electrode electrolyte and connected to a first fixed end plate 10 via a first infusion pump 231; and a negative electrode storage tank 24 for storing negative electrode electrolyte and connected to a second fixed end plate 22 via a second infusion pump 241.

[0066] Assemble the flow battery stack as described above, setting the electrode area to 500 cm². 2 The high-efficiency flow battery consists of 20 cells, using a surface-sealed design with a 1mm thick silicone gasket as the sealing material. After assembly, the stack is ensured to have no internal or external leakage. Testing shows a charge / discharge coulombic efficiency of 98.7%, a voltage efficiency of 86.6%, and an energy efficiency of 85.5%.

[0067] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model. These are all equivalent modifications and improvements made to the above embodiments based on the essential technology of this utility model, and all of these fall within the protection scope of this utility model.

Claims

1. A high energy efficient flow battery, characterized in that, The application relates to a fuel cell, which comprises a first fixed end plate, a first liquid inlet plate, a first current collecting plate, a first bipolar plate, a positive electrode frame, a positive cover plate, an ion exchange membrane, a negative cover plate, a negative electrode frame, a second bipolar plate, a second current collecting plate, a second liquid inlet plate and a second fixed end plate arranged in sequence. The inner side of the positive electrode frame is provided with a positive liquid inlet flow channel and a positive liquid outlet flow channel which are centrally symmetrically distributed, the positive liquid inlet flow channel and the positive liquid outlet flow channel are both L-shaped and at least extend to one side of the positive cavity, and the inner side of the negative electrode frame is provided with a negative liquid inlet flow channel and a negative liquid outlet flow channel which are centrally symmetrically distributed, the negative liquid inlet flow channel and the negative liquid outlet flow channel are both L-shaped and at least extend to one side of the negative cavity. After the positive electrolyte enters the first fixed end plate, the positive electrolyte sequentially passes through the first liquid inlet plate, the first current collecting plate, the first bipolar plate and the positive electrode frame, is guided and diffused through the positive liquid inlet flow channel, enters the positive electrode from the first side of the positive electrode to participate in the reaction, flows out from the positive liquid outlet flow channel after flowing to the positive liquid outlet flow channel from the second side of the positive electrode, and then sequentially passes through the positive cover plate, the ion exchange membrane, the negative cover plate, the negative electrode frame, the second bipolar plate, the second current collecting plate, the second liquid inlet plate and the second fixed end plate to flow out. After the negative electrolyte enters the second fixed end plate, the negative electrolyte sequentially passes through the second liquid inlet plate, the second current collecting plate, the second bipolar plate and the negative electrode frame, is guided and diffused through the negative liquid inlet flow channel, enters the negative electrode from the first side of the negative electrode to participate in the reaction, flows out from the negative liquid outlet flow channel after flowing to the negative liquid outlet flow channel from the second side of the negative electrode, and then sequentially passes through the negative cover plate, the ion exchange membrane, the positive cover plate, the positive electrode frame, the first bipolar plate, the first current collecting plate, the first liquid inlet plate and the first fixed end plate to flow out.

2. The energy efficient flow battery of claim 1, wherein, The first fixed end plate is provided with a first positive liquid inlet, the first liquid inlet plate is correspondingly provided with a second positive liquid inlet, the first current collecting plate is correspondingly provided with a third positive liquid inlet, the first bipolar plate is correspondingly provided with a fourth positive liquid inlet, and the positive electrode frame is correspondingly provided with a fifth positive liquid inlet. The fifth positive liquid inlet is connected with one end of the positive liquid inlet flow channel, and a plurality of positive liquid inlet grooves which are connected with the positive cavities are arranged on the positive liquid inlet flow channel; one end of the positive liquid outlet flow channel is connected with a first positive liquid outlet, and a plurality of positive liquid outlet grooves which are connected with the positive cavities are arranged on the positive liquid outlet flow channel. The positive cover plate is correspondingly provided with a second positive liquid outlet, the ion exchange membrane is correspondingly provided with a third positive liquid outlet, the negative cover plate is correspondingly provided with a fourth positive liquid outlet, the negative electrode frame is correspondingly provided with a fifth positive liquid outlet, the second bipolar plate is correspondingly provided with a sixth positive liquid outlet, the second current collecting plate is correspondingly provided with a seventh positive liquid outlet, the second liquid inlet plate is correspondingly provided with an eighth positive liquid outlet, and the second fixed end plate is correspondingly provided with a ninth positive liquid outlet. The positive electrolyte enters from the fifth positive outlet and the positive inlet groove, and flows out from the first positive outlet and the positive outlet groove after the positive electrode participates in the reaction.

3. The energy efficient flow battery of claim 2, wherein, The second fixed end plate is provided with a first negative inlet, the second inlet plate is provided with a second negative inlet, the second collector plate is provided with a third negative inlet, the second bipolar plate is provided with a fourth negative inlet, and the negative electrode frame is provided with a fifth negative inlet. The fifth negative inlet is connected with one end of the negative inlet flow channel, and the negative inlet flow channel is further provided with a plurality of negative inlet grooves connected with the negative cavity. The negative cover plate is provided with a second negative outlet, the ion exchange membrane is provided with a third negative outlet, the positive cover plate is provided with a fourth negative outlet, the positive electrode frame is provided with a fifth negative outlet, the second bipolar plate is provided with a sixth negative outlet, the second collector plate is provided with a seventh negative outlet, the second inlet plate is provided with an eighth negative outlet, and the second fixed end plate is provided with a ninth negative outlet. The negative electrolyte enters from the fifth negative outlet and the negative inlet groove, and flows out from the first negative outlet and the negative outlet groove after the negative electrode participates in the reaction.

4. The energy efficient flow battery of claim 3, wherein, The positive inlet groove and the positive outlet groove are respectively located at four corners of the positive cavity, and the negative inlet groove and the negative outlet groove are respectively located at four corners of the negative cavity.

5. The energy efficient flow battery of claim 4, wherein, The positive electrode frame is provided with a first partition in the middle of the positive cavity, and the negative electrode frame is provided with a second partition in the middle of the negative cavity.

6. The energy efficient flow battery of claim 5, wherein, The positive cover plate is provided with a first partition rib corresponding to the first partition, and the negative cover plate is provided with a second partition rib corresponding to the second partition.

7. The energy efficient flow battery of claim 1, wherein, The first fixed end plate and the second fixed end plate are respectively provided with corresponding first locking holes and second locking holes.

8. A battery stack, characterized by A plurality of high-energy-efficiency liquid flow batteries according to any one of claims 1-7 are connected in series.

9. A flow battery system, characterized by, The battery stack according to claim 8 comprises: The battery stack according to claim 8 comprises: A positive liquid storage tank is used to store the positive electrolyte and is connected to the first fixed end plate through a first liquid pump. A negative liquid storage tank is used to store the negative electrolyte and is connected to the second fixed end plate through a second liquid pump.

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