CN115483424A - A stack and stack system - Google Patents

Abstract

The invention discloses a galvanic pile and a galvanic pile system, wherein the galvanic pile comprises: a first end plate, a second end plate, and a plurality of flow battery cells stacked between the first end plate and the second end plate; the plurality of flow battery units are connected in series; the first end plate, the second end plate and the side face of the electric pile are all made of insulating materials and are welded together in a hot melting mode; the side of the stack includes: the outer surface of the multi-sheet flow battery unit is formed by superposition. The galvanic pile provided by the invention does not need regular maintenance and has higher reliability.

Description

A stack and a stack system

technical field

The invention belongs to the technical field of liquid flow energy storage, and in particular relates to an electric stack and an electric stack system.

Background technique

The rapid development of renewable energy represented by wind energy and solar energy, as well as its own instability and discontinuity have a serious impact on the power grid, making large-scale and efficient energy storage technology a key technology for large-scale utilization of renewable energy power generation. . Among many energy storage technologies, electrochemical energy storage technology is developing rapidly because of its high efficiency and environmental friendliness. At present, many countries have successively built kW-MW electrochemical energy storage systems, which are matched with renewable energy power generation systems such as solar energy and wind energy, and play an important role in smoothing output, tracking planned power generation, balancing loads, and peak-shaving and valley-filling. effect.

As a typical device of electrochemical energy storage technology, flow battery has outstanding advantages such as high efficiency, long cycle life, independent design of capacity and power, fast response, high safety, and high cost performance in the life cycle. It is especially suitable for large-scale storage. can. The battery stack is a higher-level energy storage system unit structure that connects multiple flow batteries in series and assembles them.

The existing electric stack is shown in Figure 1. There are metal end plates made of steel or aluminum at both ends. Metal screws are used to connect the metal end plates and multiple flow batteries at both ends in series. The pile is compacted and fastened with a nut and a screw. Among them, the liquid flow battery also utilizes the above-mentioned screw and nut to achieve a single sealed package.

However, the existing electric stacks need to be tightened and maintained regularly, otherwise, once the nuts are loose, the fastening effect of the electric stack will decrease, which will cause the electrolyte solution of the flow battery to leak, and then cause the internal short circuit of the electric stack, resulting in the entire battery Heap invalidation.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, the present invention provides an electric stack and an electric stack system.

The technical problem to be solved in the present invention is realized through the following technical solutions:

A battery stack, comprising: a first end plate, a second end plate, and multiple pieces of liquid flow battery cells stacked between the first end plate and the second end plate; the multiple pieces of liquid flow battery cells The battery cells are connected in series;

Wherein, the first end plate, the second end plate and the side of the electric stack are all insulating materials and are thermally welded together; surface.

Optionally, the first end plate, the second end plate, and the sides of the cell stack are all insulating materials of the same material.

Optionally, the insulating material is PP material.

Optionally, the monolithic flow battery unit includes the first flow field frame, the first bipolar plate, the first carbon felt, the second flow field frame, the ion-conducting membrane, the second carbon felt, the third a flow field frame and a second bipolar plate;

Wherein, the first bipolar plate is embedded in the middle of the first flow field frame; the ion-conducting membrane is embedded in the middle of the second flow field frame; the second bipolar plate is embedded in the third flow field frame. the middle of the field frame; the polarity of the second flow field frame is opposite to that of the first flow field frame and the third flow field frame; the first flow field frame, the second flow field frame and the The dimensions of the third flow field frames are equal and are all made of insulating materials;

Among any two adjacent stacked flow battery units, the third flow field frame and the second bipolar plate of one flow battery unit are the first flow field frame and the first bipolar plate of the other flow battery unit plate.

Optionally, the four corners of the first end plate, the second end plate, the first flow field frame, the second flow field frame and the third flow field frame are all provided with corresponding Electrolyte solution flow holes;

Wherein, the electrolyte solution circulation hole connected to the electrolyte solution flow channel inside the first flow field frame and the third flow field frame is connected to the electrolyte solution flow channel inside the second flow field frame The electrolytic solution flow holes are opposite to each other.

Optionally, it also includes: a first collector plate assembly unit, a second collector plate assembly unit and a third collector plate assembly unit;

The third collector plate assembly unit includes a third bipolar plate, a first bipolar plate frame, and a current collector plate stacked in sequence;

The second current collecting plate assembly unit includes a third bipolar plate, a first bipolar plate frame, a current collecting plate, a second bipolar plate frame and a fourth bipolar plate stacked in sequence;

The first current collecting plate assembly unit includes sequentially stacked current collecting plates, a second bipolar plate frame, and a fourth bipolar plate;

Wherein, the third bipolar plate is embedded in the middle of the first bipolar plate frame, and the fourth bipolar plate is embedded in the middle of the second bipolar plate frame; the first bipolar plate frame and the The second bipolar plate frame is provided with electrolyte solution circulation holes corresponding to the positions of the electrolyte solution circulation holes on the four corners; the first flow field frame, the second flow field frame, and the third flow field frame, the first bipolar plate frame, and the second bipolar plate frame are of equal size and are all made of insulating material;

The first collector plate assembly unit is configured to be inserted between the first end plate and the plurality of flow battery units, and is used to replace the first flow field frame and the a first bipolar plate;

The second collector plate assembly unit is configured to be inserted between the first bipolar plate of the flow battery unit and the first carbon felt;

The third collector plate combination unit is configured to be inserted between the plurality of flow battery units and the second end plate, and is used to replace the third flow field frame of the nearest flow battery unit and second bipolar plate;

The side of the electric stack specifically includes: the multi-piece flow battery unit, the first current collector assembly unit, the second current collector assembly unit, and the third current collector assembly unit are stacked. The outer surface.

Optionally, the first current collector assembly unit, a plurality of the second current collector assembly units, and the third current collector assembly units are inserted into the electric stack at equal intervals, and the interval At least spanning 1 flow battery unit.

Optionally, the number of the flow battery units is 80, and the number of the second collector plate assembly units is 3.

The present invention also provides an electric stack system, including: a plurality of electric stacks and an electrolyte solution circuit;

Wherein, the electric stack is any one of the above electric stacks; a plurality of the electric stacks are connected in series;

The electrolyte solution circuit is used to provide an electrolyte solution circuit for each of the electric stacks respectively.

Optionally, the electrolyte solution circuit is specifically configured to: respectively provide an electrolyte solution circuit for each of the electric stacks in a circuitous manner.

In the stack provided by the present invention, the first end plate, the second end plate, and the side of the stack are all made of insulating materials; wherein, the side of the stack includes an outer surface formed by stacking a plurality of flow battery units; thus, The first end plate, the second end plate, and the side of the electric stack can be thermally welded together by heat welding, so that the electric stack can be effectively and permanently fixed, and a good sealing effect can be achieved. Therefore, the electric stack provided by the present invention does not require post-maintenance, does not cause electrolyte solution leakage, and has high reliability.

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the structural schematic diagram of existing stack;

Fig. 2 is a schematic structural diagram of an electric stack provided by an embodiment of the present invention;

Fig. 3 shows a schematic structural diagram of a flow battery unit suitable for the stack provided by the embodiment of the present invention;

Fig. 4 is a perspective view of the flow battery unit shown in Fig. 3;

Fig. 5 shows a battery stacking method in which the battery stack provided by the embodiment of the present invention is formed based on the flow battery unit shown in Fig. 3;

Fig. 6 is a schematic structural diagram of another electric stack provided by an embodiment of the present invention;

Fig. 7 is a perspective view of the stack shown in Fig. 6;

Fig. 8 is a schematic structural diagram of a stack system provided by an embodiment of the present invention;

FIG. 9 is a top view of the electric stack system shown in FIG. 8 .

detailed description

The present invention will be described in further detail below in conjunction with specific examples, but the embodiments of the present invention are not limited thereto.

In order to improve the reliability of the electric stack, an embodiment of the present invention provides an electric stack. Figure 2 shows a plan view of the electric stack. As shown in Figure 2, the electric stack includes: a first end plate 1, a second Two end plates 2 and a plurality of flow battery units 3 stacked between the first end plate 1 and the second end plate 2; these flow battery units 3 are connected in series.

Wherein, the first end plate 1 , the second end plate 2 and the side of the stack are all insulating materials, and the side of the stack mentioned here includes the outer surface formed by stacking a plurality of flow battery units 3 . As a result, the first end plate 1, the second end plate 2, and the sides of the electric stack are thermally welded together by heating and welding, which can effectively and permanently fix the electric stack and achieve a good sealing effect without further post-processing. Maintenance will not cause electrolyte solution leakage, which improves the reliability of the entire stack.

In practical applications, a hydraulic press can be used to exert inward pressure on the first end plate 1 and the second end plate 2, so as to compress the entire electric stack, and then perform heating and welding. In Fig. 2, the two sides of the electric stack formed by heating and welding are circled by a dotted line frame.

Wherein, the above-mentioned insulating material may include PP (polypropylene) material, PVC (polyvinyl chloride) material and the like. Preferably, the first end plate 1 and the second end plate 2 can be thickened hard end plates made of PP material, so that they can effectively withstand the pressure given by the hydraulic press without causing deformation.

In an implementation manner, the first end plate 1 , the second end plate 2 and the sides of the stack are all insulating materials of the same material. Certainly, the material of the first end plate 1 and the second end plate 2 may also be different from the material of the side of the cell stack, as long as they can be heated and welded together.

Exemplarily, Fig. 3 shows an exploded view of a flow battery unit 3 suitable for the electric stack provided by the embodiment of the present invention, and the flow battery unit 3 includes: a first flow field frame 31, a first double Pole plate 32, first carbon felt 33, second flow field frame 34, ion conduction membrane 35, second carbon felt 36, third flow field frame 37 and second bipolar plate 38; the stack of the flow battery unit 3 The combined effect is shown in Figure 4.

Wherein, the first bipolar plate 32 is embedded in the middle of the first flow field frame 31, the ion-conducting membrane 35 is embedded in the middle of the second flow field frame 34, and the second bipolar plate 38 is embedded in the middle of the third flow field frame 37; The size of the flow field frame 31, the second flow field frame 34 and the third flow field frame 37 are equal and are all made of insulating materials; thus, each of the first flow field frame 31 and the second flow field frame 34 in the electric stack And the third flow field frame 37 is stacked together to form the stack side; the first carbon felt 33 is sandwiched between the first flow field frame 31 and the second flow field frame 34, and the second carbon felt 36 is sandwiched between the second flow field frame 31 and the second flow field frame 34. between the flow field frame 34 and the third flow field frame 37 .

Specifically, for each of the first flow field frame 31, the second flow field frame 34, and the third flow field frame 37, a rectangular hole can be set in its center position, and the rectangular hole is surrounded by a single-layer stepped concave stage for embedding bipolar plates or ion-conducting membranes. The depth of the concave table is the same as the thickness of the bipolar plates or ion-conducting membranes, so that when the flow field frames are stacked, the embedded bipolar plates or ion-conducting membranes will not cause gaps between the flow field frames, thereby Ensure sealing effect.

In this flow battery unit 3, the polarity of the second flow field frame 34 is opposite to that of the first flow field frame 31 and the third flow field frame 37; The third flow field frame 37 and the second bipolar plate 38 of the flow battery unit 3 are the first flow field frame 31 and the first bipolar plate 32 of another flow battery unit 3 . That is to say, every two adjacent flow battery units 3 share a flow field frame and a bipolar plate.

For example, assuming that the first flow field frame 31 is injected with a positive electrode electrolyte solution, the first flow field frame 31 and the third flow field frame 37 are positive electrode flow field frames, and the second flow field frame 34 is injected with a negative electrode electrolyte solution to become Negative flow field box. At this time, the stacking manner and polarity distribution of multiple flow battery units 3 in the stack are shown in FIG. 5 .

It can be understood that, based on the flow battery unit 3 shown in FIG. 3 and the battery stacking method shown in FIG. 5 , the volume of the stack can be effectively reduced. frame and bipolar plate, so the equivalent resistance in series between the two is relatively low, so that the stack has better electrical performance.

In one implementation, as shown in FIG. 3, the first end plate 1, the second end plate 2, the first flow field frame 31, the second flow field frame 34, and the third flow field frame 37 are all at the four corners Electrolyte solution circulation holes corresponding to positions are provided on the top; among them, the electrolyte solution circulation holes connected by the electrolyte solution flow channels inside the first flow field frame 31 and the third flow field frame 37 are connected with the inside of the second flow field frame 34 The electrolytic solution flow holes connected by the electrolytic solution flow passages are opposite to each other.

Specifically, assume that the first flow field frame 31 and the third flow field frame 37 in FIG. 3 are positive flow field frames, and the second flow field frame 34 is a negative flow field frame; Under the pressure of the external circulation pump, the positive electrode electrolyte solution enters the stack from the positive electrode electrolyte solution inlet provided on the first end plate 1 or the second end plate 2, and the positive electrode electrolyte solution composed of each electrolyte solution flow hole corresponding to the inlet Channels flow to individual flow battery cells within the stack. Among them, the electrolyte solution through hole (indicated by C in Figure 3) of the positive electrode flow field frame introduces the positive electrode electrolyte solution into the electrolyte solution flow channel inside it, and after the positive electrode electrolyte solution flows through the middle of the positive electrode flow field frame, it is collected into the positive electrode flow field. The electrolyte solution flow hole (indicated by D in FIG. 3 ) at the other end of the field frame flows out of the positive electrode flow field frame and enters the positive electrode electrolyte corresponding to the positive electrode electrolyte solution outlet on the first end plate 1 or the second end plate 2. In the solution channel, and flow out of the stack from this channel. At the same time, since the electrolyte solution through hole on the negative electrode flow field frame is not connected with the positive electrode electrolyte solution channel, the positive electrode electrolyte solution will not enter the negative electrode flow field frame.

In the same way, the negative electrode electrolyte solution enters the cell stack from the negative electrode electrolyte solution inlet provided on the first end plate 1 or the second end plate 2, and under the action of equal pressure, the negative electrode composed of each electrolyte solution flow hole corresponding to the inlet The electrolyte solution channel flows to each flow battery unit in the stack. Among them, the electrolyte solution through hole (indicated by A in Fig. 3) of the negative electrode flow field frame introduces the negative electrode electrolyte solution into the electrolyte solution flow channel inside it, and after the negative electrode electrolyte solution flows through the middle of the negative electrode flow field frame, it is collected into the negative electrode flow field. The electrolyte solution flow hole (indicated by B in FIG. 3 ) at the other end of the field frame flows out of the negative electrode flow field frame, and enters the negative electrode electrolyte corresponding to the negative electrode electrolyte solution outlet arranged on the first end plate 1 or the second end plate 2. In the solution channel, and flow out of the stack from this channel. At the same time, since the electrolyte solution through hole on the positive electrode flow field frame is not connected with the negative electrode electrolyte solution channel, the negative electrode electrolyte solution will not enter the positive electrode flow field frame.

The embodiment of the present invention does not limit the design of the electrolyte solution flow channels inside the first flow field frame 31, the second flow field frame 34, and the third flow field frame 37. Therefore, the specific orientation of the electrolyte solution flow channels is shown in FIG. 3 A certain amount of obfuscation.

Based on the flow battery unit shown in FIG. 3 , it can be seen that the electrolyte solution in the flow battery unit is evenly distributed and has good current density uniformity, thereby ensuring good electrical performance of the stack. Moreover, under the same power design, the battery stack formed based on the stacking of flow battery cells shown in Figure 3 has a smaller volume than the existing battery stack.

It should be noted that the flow battery unit shown in Figure 3 is only an example and does not constitute a limitation to the embodiment of the present invention. All flow battery units are applicable to the embodiments of the present invention.

In addition, the embodiments of the present invention also do not limit the specific positions of the electrolyte solution circulation holes of the stack and the internal flow battery cells, as long as the normal circulation requirements of the positive and negative electrolyte solutions are met.

In an implementation manner, as shown in FIG. 6 , the electric stack provided by the embodiment of the present invention further includes: a first current collector assembly unit 4 , a second current collector assembly unit 5 , and a third current collector assembly unit 6 .

Wherein, the third current collecting plate assembly unit 6 includes a third bipolar plate 41 , a first bipolar plate frame 42 , and a current collecting plate 43 stacked in sequence.

The second current collecting plate assembly unit 5 includes a third bipolar plate 41 , a first bipolar plate frame 42 , a current collecting plate 43 , a second bipolar plate frame 44 and a fourth bipolar plate 45 stacked in sequence.

The first current collecting plate assembly unit 4 includes a current collecting plate 43 , a second bipolar plate frame 44 and a fourth bipolar plate 45 stacked in sequence.

The above-mentioned current collecting plates 43 are all copper plates treated with anticorrosion, with a thickness of 0.5mm˜1.5mm.

The third bipolar plate 41 is embedded in the middle of the first bipolar plate frame 42, and the fourth bipolar plate 45 is embedded in the middle of the second bipolar plate frame 44; the first bipolar plate frame 42 and the second bipolar plate frame 44 are both Electrolyte solution flow holes corresponding to the positions of the electrolyte solution flow holes on the first flow field frame 31 , the second flow field frame 31 and the third flow field frame 37 are provided at the four corners.

The first collector plate assembly unit 4 is configured to be inserted between the first end plate 1 and the multiple flow battery units 3 contained in the stack, and is used to replace the first flow field of the nearest flow battery unit 3 Frame 31 and first bipolar plate 32 .

The second collector plate assembly unit 5 is configured to be inserted between the first bipolar plate 32 and the first carbon felt 33 of the flow battery unit 3 .

The third current collecting plate combination unit 6 is configured to be inserted between the multiple flow battery units 3 contained in the electric stack and the second end plate 2, and is used to replace the third flow field of the nearest flow battery unit 3 Frame 37 and second bipolar plate 38 .

The first flow field frame 31 , the second flow field frame 34 , the third flow field frame 37 , the first bipolar plate frame 42 and the second bipolar plate frame 44 have equal dimensions and are all made of insulating materials. Thus, the side of the stack specifically includes: the outer surface formed by stacking multiple flow battery units 3 , the first collector plate assembly unit 4 , the second collector plate assembly unit 5 , and the third collector plate assembly unit 6 .

In one implementation, a plurality of current collector assembly units can be used inside the stack, and these current collector assembly units are inserted into the stack at equal intervals, that is, a first current collector assembly unit, a plurality of second The current collector assembly unit and the third current collector assembly unit are inserted into the stack at equal intervals; the interval spans at least one flow battery unit.

In a preferred embodiment, the number of flow battery units used in the electric stack is 80, then five current collector assembly units can be inserted at equal intervals in the electric stack, wherein the first current collector assembly unit 4 and the third current collecting plate combination unit 6 are respectively located at both ends of these flow battery units, and the other three second current collecting plate combination units 5 are located in the middle of these flow battery units.

FIG. 7 exemplarily shows a schematic structural diagram of an electric stack including a current collecting plate assembly unit, wherein the structure marked X includes the flow battery unit spanning between adjacent current collecting plates 43 and the two The current collecting plates 43 are part of the flow field frame of the flow battery unit into which each is inserted.

By building a current collector inside the stack, the internal resistance of the stack can be effectively reduced, the current loss of the stack can be reduced, and the ion selectivity of the ion-conducting membrane of the flow battery unit in the stack can be improved under the condition of the same output power of the stack. and electrical conductivity, thereby further improving the overall performance of the stack.

Preferably, the aspect ratio of the first flow field frame 31, the second flow field frame 34, and the third flow field frame 37 may be 2.5:1-5:1, and the aspect ratio of the rectangular holes inside them may be 5.5 :1～7:1; under this aspect ratio setting, the flow rate of the electrolyte solution in the flow field frame is uniform and the pressure is stable, which can promote the easy and sufficient reaction of the electrolyte and ensure the performance of the flow battery unit. The aspect ratio of the first bipolar plate frame 42 and the second bipolar plate frame 44 is the same as that of the flow field frame mentioned above.

The electric stack provided by the embodiment of the present invention adopts the sealing method of thermal welding, does not need an auto-tightening device, has a simple structure, a small volume, better sealing performance, and has good electrical performance. In addition, the stack also has the advantages of low cost and low post-operation and maintenance costs, and is not prone to the risk of electrolyte solution leakage.

Based on the stack provided in the embodiment of the present invention, the embodiment of the present invention also provides a stack system, including: a plurality of stacks connected in series and an electrolyte solution circuit; the stack used in the stack system can be the above Any electric stack mentioned in the text; the electrolyte solution circuit is used to provide an electrolyte solution circuit for each of the electric stacks respectively.

Existing stack systems are usually directly formed by connecting multiple flow batteries in series, and these flow batteries share the same electrolyte solution circuit. However, the greater the flow resistance of the electrolyte solution with the number of cells connected in series, it is easy to cause insufficient flow supply, thereby affecting the performance of the stack system; in addition, the more cells in series, the greater the leakage current of the stack system, and the The performance of the heap system is lower.

In view of the above problems, the stack system provided by the embodiment of the present invention uses electrolyte solution loops to provide electrolyte solution circuits for each stack respectively, so as to realize uniform distribution of electrolyte solution among the stacks and solve the above-mentioned problem of insufficient flow supply. In addition, since each stack has an independent electrolyte solution circuit, fewer flow battery cells in series in each stack can still ensure the number of flow battery cells in series in the entire stack system, thereby Reduce the leakage current of the whole stack system.

In an optional implementation manner, the electrolyte solution circuit may provide an electrolyte solution circuit for each cell stack in a circuitous manner. FIG. 8 and FIG. 9 exemplarily show a structural schematic diagram of a stack system, wherein FIG. 8 is a perspective view of the stack system, and FIG. 9 is a top view of the stack system. Referring to Figure 8 and Figure 9, in this electric stack system, multiple electric stacks are stacked together, the dark pipe is the positive electrode electrolyte solution circuit pipe in the electrolyte solution circuit, and the light colored pipe is the negative electrode electrolyte solution in the electrolyte solution circuit return pipe.

It can be seen from Figures 8 and 9 that after the electrolyte solution enters the stack system from the inlets of the positive electrolyte solution loop pipe and the negative electrolyte solution loop pipe, it enters the stack after a circuitous pipeline. By setting a detour pipeline, the bypass resistance of the stack system can be effectively reduced, thereby further improving the performance of the stack system.

In an implementation manner, the stack system provided by the embodiment of the present invention may further include: a filter; the filter is arranged at the inlet of the electrolyte solution circuit pipe, and is used to filter insufficiently dissolved metals that may exist in the electrolyte solution salt, or to filter externally entering impurities and other types of insolubles, etc.

Specifically, the electrolyte solution passed through the filter is transported to the electrolyte solution inlet of each stack through the electrolyte solution return pipe, and then after circulating in each stack, it is collected to the main pipe of the electrolyte solution return pipe of the stack system, and finally Return to reservoir.

It should be noted that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example Or features are included in at least one embodiment or example of the invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

Although the present application has been described in conjunction with various embodiments here, however, in the process of implementing the claimed application, those skilled in the art can understand and Other variations of the disclosed embodiments are implemented.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deduction or replacement can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (10)

1. A battery stack, characterized by comprising: a first end plate, a second end plate, and a plurality of flow battery units stacked between the first end plate and the second end plate; The plurality of flow battery units are connected in series; Wherein, the first end plate, the second end plate and the side of the electric stack are all insulating materials and are thermally welded together; surface. 2 . The electric stack according to claim 1 , wherein the first end plate, the second end plate, and the side of the electric stack are all insulating materials of the same material. 3. The electric stack according to claim 1 or 2, characterized in that, the insulating material is PP material. 4. The electric stack according to claim 1, wherein the monolithic flow battery unit comprises a first flow field frame, a first bipolar plate, a first carbon felt, and a second flow field frame stacked in sequence , an ion conducting membrane, a second carbon felt, a third flow field frame and a second bipolar plate; Wherein, the first bipolar plate is embedded in the middle of the first flow field frame; the ion-conducting membrane is embedded in the middle of the second flow field frame; the second bipolar plate is embedded in the third flow field frame. the middle of the field frame; the polarity of the second flow field frame is opposite to that of the first flow field frame and the third flow field frame; the first flow field frame, the second flow field frame and the The dimensions of the third flow field frames are equal and are all made of insulating materials; Among any two adjacent stacked flow battery units, the third flow field frame and the second bipolar plate of one flow battery unit are the first flow field frame and the first bipolar plate of the other flow battery unit plate. 5. The electric stack according to claim 4, wherein the first end plate, the second end plate, the first flow field frame, the second flow field frame and the third The flow field frames are provided with electrolyte solution circulation holes corresponding to the positions at the four corners; Wherein, the electrolyte solution circulation hole connected to the electrolyte solution flow channel inside the first flow field frame and the third flow field frame is connected to the electrolyte solution flow channel inside the second flow field frame The electrolytic solution flow holes are opposite to each other. 6. The electric stack according to claim 5, further comprising: a first current collector assembly unit, a second current collector assembly unit, and a third current collector assembly unit; The third collector plate assembly unit includes a third bipolar plate, a first bipolar plate frame, and a current collector plate stacked in sequence; The second current collecting plate assembly unit includes a third bipolar plate, a first bipolar plate frame, a current collecting plate, a second bipolar plate frame and a fourth bipolar plate stacked in sequence; The first current collecting plate assembly unit includes sequentially stacked current collecting plates, a second bipolar plate frame, and a fourth bipolar plate; Wherein, the third bipolar plate is embedded in the middle of the first bipolar plate frame, and the fourth bipolar plate is embedded in the middle of the second bipolar plate frame; the first bipolar plate frame and the The second bipolar plate frame is provided with electrolyte solution circulation holes corresponding to the positions of the electrolyte solution circulation holes on the four corners; the first flow field frame, the second flow field frame, and the third flow field frame, the first bipolar plate frame, and the second bipolar plate frame are of equal size and are all made of insulating material; The first collector plate assembly unit is configured to be inserted between the first end plate and the plurality of flow battery units, and is used to replace the first flow field frame and the a first bipolar plate; The second collector plate assembly unit is configured to be inserted between the first bipolar plate of the flow battery unit and the first carbon felt; The third collector plate combination unit is configured to be inserted between the plurality of flow battery units and the second end plate, and is used to replace the third flow field frame of the nearest flow battery unit and second bipolar plate; The side of the electric stack specifically includes: the multi-piece flow battery unit, the first current collector assembly unit, the second current collector assembly unit, and the third current collector assembly unit are stacked. The outer surface. 7. The electric stack according to claim 5, wherein the first current collector assembly unit, the plurality of second current collector assembly units, and the third current collector assembly units are equally spaced inserted into the electric stack, and the interval spans at least one flow battery unit. 8 . The electric stack according to claim 7 , wherein the number of the flow battery units is 80, and the number of the second collector plate combination units is 3. 9 . 9. A stack system, characterized in that it comprises: a plurality of stacks and electrolyte solution loops; Wherein, the electric stack is the electric stack according to any one of claims 1 to 8; a plurality of the electric stacks are connected in series; The electrolyte solution circuit is used to provide an electrolyte solution circuit for each of the electric stacks respectively. 10 . The electric stack system according to claim 9 , wherein the electrolyte solution circuit is specifically used to provide an electrolyte solution circuit for each of the electric stacks in a circuitous manner. 11 .

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