A liquid flow battery multi-stack cascading test system

Abstract

The application discloses a kind of liquid flow battery multiple stack cascade test systems, it is related to liquid flow battery energy storage system technical field.The liquid flow battery multiple stack cascade test system includes: stack setting module, including multiple stack setting units, each stack setting unit includes multiple stack setting groups, and each stack setting group includes at least one stack setting mechanism;Stack setting structure is used to set up stack, including stack positive electrode liquid inlet, stack negative electrode liquid inlet, stack positive electrode liquid outlet and stack negative electrode liquid outlet;Electrolyte circulation module includes positive electrode liquid storage tank, negative electrode liquid storage tank, positive electrode main liquid inlet pipeline, positive electrode auxiliary liquid inlet pipeline, positive electrode main liquid return pipeline, negative electrode main liquid inlet pipeline, negative electrode auxiliary liquid inlet pipeline, negative electrode main liquid return pipeline and multiple control valves arranged in each pipeline.The technical scheme of the application can realize multiple liquid supply modes in the liquid flow battery multiple stack cascade test system, and detect the influence of different liquid supply modes on the charge-discharge efficiency of the liquid flow battery energy storage system.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of liquid flow battery energy storage system, and particularly relates to a liquid flow battery multi-stack cascade test system. BACKGROUND

[0002] The liquid flow battery is a new type of electrochemical energy storage method, and the liquid flow battery realizes charging and discharging by using the oxidation-reduction reaction between active substances contained in the positive electrolyte and the negative electrolyte. For a large-scale energy storage power station, the output power of a single stack cannot meet the charging and discharging demand of the system, therefore, a plurality of stacks in series and parallel combination is adopted to improve the voltage and current of the liquid flow battery energy storage system, so as to improve the charging and discharging power of the energy storage unit or module, and meet the demand of the large-scale energy storage power station stack energy storage unit or module.

[0003] With the improvement of the power of the liquid flow battery energy storage system, the number of stacks is also increased, and there are various liquid supply modes for supplying the positive electrolyte and the negative electrolyte to the plurality of stacks in series and parallel combination. Different liquid supply modes may cause differences in the flow mode, mixing degree and reaction rate of the electrolyte in the stack, and further affect the charging and discharging efficiency of the liquid flow battery energy storage system. Therefore, it is crucial to realize various liquid supply modes in the liquid flow battery multi-stack cascade test system, so as to effectively monitor the influence of different liquid supply modes on the charging and discharging efficiency of the liquid flow battery energy storage system. The prior art usually only detects the charging and discharging efficiency of a single stack, and cannot comprehensively evaluate the influence of different liquid supply modes on the charging and discharging efficiency of the whole system. SUMMARY

[0004] The present application provides a liquid flow battery multi-stack cascade test system to realize various liquid supply modes in the liquid flow battery multi-stack cascade test system, so as to monitor the influence of different liquid supply modes on the charging and discharging efficiency of the liquid flow battery energy storage system.

[0005] The first aspect of the present application provides a liquid flow battery multi-stack cascade test system, which comprises:

[0006] The stack setting module comprises a plurality of stack setting units; each stack setting unit comprises a plurality of stack setting groups; each stack setting group comprises at least one stack setting mechanism; the stack setting mechanism is used for setting a stack; the stack setting mechanism comprises a stack positive electrolyte inlet, a stack negative electrolyte inlet, a stack positive electrolyte outlet and a stack negative electrolyte outlet; each stack in the same stack setting unit is connected in series, and each stack in different stack setting units is connected in parallel.

[0007] The electrolyte circulation module comprises a positive electrode liquid storage tank, a negative electrode liquid storage tank, a positive electrode main liquid inlet pipeline, a positive electrode auxiliary liquid inlet pipeline, a plurality of positive electrode liquid inlet branch pipelines, a positive electrode main liquid return pipeline, a plurality of positive electrode liquid return branch pipelines, a negative electrode main liquid inlet pipeline, a negative electrode auxiliary liquid inlet pipeline, a plurality of negative electrode liquid inlet branch pipelines, a negative electrode main liquid return pipeline and a plurality of negative electrode liquid return branch pipelines;

[0008] The positive electrode main liquid inlet pipeline is in communication with the main liquid outlet of the positive electrode liquid storage tank and each of the positive electrode liquid inlet branch pipelines; each of the positive electrode liquid inlet branch pipelines is in one-to-one correspondence with each of the stack setting units; the positive electrode liquid inlet branch pipeline comprises a plurality of positive electrode pipeline liquid outlet groups in one-to-one correspondence with a plurality of stack setting groups in the stack setting unit; each of the positive electrode pipeline liquid outlet groups comprises at least one positive electrode pipeline liquid outlet in one-to-one correspondence with at least one stack setting mechanism in the stack setting group; the positive electrode pipeline liquid outlet is in communication with the stack positive electrode liquid inlet;

[0009] The positive electrode liquid inlet branch pipeline is further provided with at least one positive electrode auxiliary liquid inlet and at least one first control valve; the positive electrode auxiliary liquid inlet and the first control valve are located in the positive electrode liquid inlet branch pipeline between the adjacent two stack setting groups in the same stack setting unit;

[0010] The positive electrode auxiliary liquid inlet pipeline is in communication with the auxiliary liquid outlet of the positive electrode liquid storage tank and each of the positive electrode auxiliary liquid inlets; the second control valve is arranged in the positive electrode auxiliary liquid inlet pipeline between the auxiliary liquid outlet of the positive electrode liquid storage tank and the positive electrode auxiliary liquid inlet;

[0011] The positive electrode main liquid return pipeline is in communication with the main liquid return of the positive electrode liquid storage tank and each of the positive electrode liquid return branch pipelines; each of the positive electrode liquid return branch pipelines is in one-to-one correspondence with each of the stack setting units; the positive electrode liquid return branch pipeline comprises a plurality of positive electrode pipeline liquid return groups in one-to-one correspondence with a plurality of stack setting groups in the stack setting unit; each of the positive electrode pipeline liquid return groups comprises at least one positive electrode pipeline liquid return in one-to-one correspondence with at least one stack setting mechanism in the stack setting group; the positive electrode pipeline liquid return is in communication with the stack positive electrode liquid outlet;

[0012] The negative electrode main liquid inlet pipeline is in communication with the main liquid outlet of the negative electrode liquid storage tank and each of the negative electrode liquid inlet branch pipelines; each of the negative electrode liquid inlet branch pipelines is in one-to-one correspondence with each of the stack setting units; the negative electrode liquid inlet branch pipeline comprises a plurality of negative electrode pipeline liquid outlet groups in one-to-one correspondence with a plurality of stack setting groups in the stack setting unit; each of the negative electrode pipeline liquid outlet groups comprises at least one negative electrode pipeline liquid outlet in one-to-one correspondence with at least one stack setting mechanism in the stack setting group; the negative electrode pipeline liquid outlet is in communication with the stack negative electrode liquid inlet;

[0013] The negative electrode liquid inlet branch pipeline is further provided with at least one negative electrode auxiliary liquid inlet and at least one third control valve; the negative electrode auxiliary liquid inlet and the third control valve are located in the negative electrode liquid inlet branch pipeline between adjacent two of the electrode setting groups in the same electrode setting unit;

[0014] The negative electrode auxiliary liquid inlet pipeline is in communication with the auxiliary liquid outlet of the negative electrode liquid storage tank and each negative electrode auxiliary liquid inlet respectively; the fourth control valve is arranged in the negative electrode auxiliary liquid inlet pipeline between the auxiliary liquid outlet of the negative electrode liquid storage tank and the negative electrode auxiliary liquid inlet;

[0015] The negative electrode main liquid return pipeline is in communication with the main liquid return outlet of the negative electrode liquid storage tank and each negative electrode liquid return branch pipeline respectively; each negative electrode liquid return branch pipeline corresponds to one of the electrode setting units respectively; the negative electrode liquid return branch pipeline comprises a plurality of negative electrode pipeline liquid return outlet groups corresponding to a plurality of the electrode setting groups in the electrode setting unit; each negative electrode pipeline liquid return outlet group comprises at least one negative electrode pipeline liquid return outlet corresponding to at least one of the electrode setting mechanisms in the electrode setting group; the negative electrode pipeline liquid return outlet is in communication with the electrode negative liquid outlet.

[0016] Optionally, the flow battery multi-stack cascade test system further comprises:

[0017] At least one fifth control valve is arranged in the positive electrode auxiliary liquid inlet pipeline between adjacent two of the positive electrode auxiliary liquid inlets;

[0018] At least one sixth control valve is arranged in the negative electrode auxiliary liquid inlet pipeline between adjacent two of the negative electrode auxiliary liquid inlets.

[0019] Optionally, the flow battery multi-stack cascade test system further comprises:

[0020] The first temperature management module comprises a heat exchange liquid inlet and a heat exchange liquid outlet; the heat exchange liquid inlet is in communication with the electrolyte heat exchange outlet of the positive electrode main liquid return pipeline through a heat exchange liquid inlet pipeline; the heat exchange liquid outlet is in communication with the electrolyte heat exchange inlet of the positive electrode main liquid return pipeline through a heat exchange liquid outlet pipeline; the first temperature management module is used at least for controlling the temperature of the electrolyte returned to the positive electrode liquid storage tank through the positive electrode main liquid return pipeline.

[0021] Optionally, the flow battery multi-stack cascade test system further comprises:

[0022] A seventh control valve is arranged in the positive electrode main liquid return pipeline between the electrolyte heat exchange outlet of the positive electrode main liquid return pipeline and the electrolyte heat exchange inlet of the positive electrode main liquid return pipeline.

[0023] Optionally, the flow battery multi-stack cascade test system further comprises:

[0024] an eighth control valve arranged in the heat exchange liquid inlet pipeline; and / or,

[0025] a ninth control valve arranged in the heat exchange liquid outlet pipeline.

[0026] Optionally, the flow battery multi-stack cascade test system further comprises:

[0027] a second temperature management module at least partially located in the positive electrolyte storage tank and at least partially located in the negative electrolyte storage tank; the second temperature management module is used to control the temperature of the electrolyte in the positive electrolyte storage tank and the negative electrolyte storage tank.

[0028] Optionally, the flow battery multi-stack cascade test system further comprises:

[0029] a plurality of positive auxiliary liquid return pipelines, each of the positive auxiliary liquid return pipelines corresponding to each of the stack arrangement units; the positive liquid return branch pipeline is further provided with at least one positive auxiliary liquid return port and at least one tenth control valve; the positive auxiliary liquid return port and the tenth control valve are located in the positive liquid return branch pipeline between the adjacent two stack arrangement groups in the same stack arrangement unit; the positive auxiliary liquid return pipeline is in communication with the positive auxiliary liquid return port and the positive main liquid return pipeline respectively; the eleventh control valve is arranged in the positive auxiliary liquid return pipeline between the positive auxiliary liquid return port and the positive main liquid return pipeline;

[0030] a plurality of negative auxiliary liquid return pipelines, each of the negative auxiliary liquid return pipelines corresponding to each of the stack arrangement units; the negative liquid return branch pipeline is further provided with at least one negative auxiliary liquid return port and at least one twelfth control valve; the negative auxiliary liquid return port and the twelfth control valve are located in the negative liquid return branch pipeline between the adjacent two stack arrangement groups in the same stack arrangement unit; the negative auxiliary liquid return pipeline is in communication with the negative auxiliary liquid return port and the negative main liquid return pipeline respectively; the thirteenth control valve is arranged in the negative auxiliary liquid return pipeline between the negative auxiliary liquid return port and the negative main liquid return pipeline.

[0031] Optionally, the flow battery multi-stack cascade test system further comprises:

[0032] a positive main drive pump arranged in the positive main liquid inlet pipeline between the main liquid outlet of the positive electrolyte storage tank and the positive liquid inlet branch pipeline;

[0033] a positive auxiliary drive pump arranged in the positive auxiliary liquid inlet pipeline between the auxiliary liquid outlet of the positive electrolyte storage tank and the positive auxiliary liquid inlet port;

[0034] A negative electrode main driving pump is arranged in the negative electrode main liquid inlet pipeline between the main liquid outlet of the negative electrode liquid storage tank and the negative electrode liquid inlet branch pipeline;

[0035] A negative electrode auxiliary driving pump is arranged in the negative electrode auxiliary liquid inlet pipeline between the auxiliary liquid outlet of the negative electrode liquid storage tank and the negative electrode auxiliary liquid inlet.

[0036] Optionally, the flow battery multi-stack cascade test system further comprises:

[0037] A plurality of sensor modules are arranged in the pipelines respectively, and are respectively used to acquire at least one of electrolyte temperature signals, flow signals and pressure signals in the pipelines;

[0038] An electric signal acquisition unit is connected with the electric stacks arranged at the electric stack arrangement mechanisms respectively, and is used to acquire electric signals of the electric stacks respectively;

[0039] An electric stack management module is connected with the electric stacks arranged at the electric stack arrangement mechanisms, the electric signal acquisition unit and the sensor modules respectively; the electric stack management module is used to control charge and discharge states of the electric stacks according to signals acquired by the sensor modules and electric signals acquired by the electric signal acquisition unit.

[0040] Optionally, the flow battery multi-stack cascade test system further comprises:

[0041] A charge and discharge module is electrically connected with the electric stacks arranged at the electric stack arrangement mechanisms respectively, and is used to acquire charge and discharge states of the electric stacks, and to determine charge and discharge efficiencies of the electric stacks according to the charge and discharge states of the electric stacks.

[0042] Optionally, the flow battery multi-stack cascade test system further comprises:

[0043] A filter is arranged in the positive electrode main liquid inlet pipeline between the main liquid outlet of the positive electrode liquid storage tank and each of the positive electrode liquid inlet branch pipelines, in the positive electrode auxiliary liquid inlet pipeline between the auxiliary liquid outlet of the positive electrode liquid storage tank and each of the positive electrode auxiliary liquid inlets, in the negative electrode main liquid inlet pipeline between the main liquid outlet of the negative electrode liquid storage tank and each of the negative electrode liquid inlet branch pipelines, and in the negative electrode auxiliary liquid inlet pipeline between the auxiliary liquid outlet of the negative electrode liquid storage tank and each of the negative electrode auxiliary liquid inlets.

[0044] Optionally, the flow battery multi-stack cascade test system further comprises:

[0045] A first exchange valve is arranged in a top exchange pipeline between a top electrolyte exchange opening of the positive electrode liquid storage tank and a top electrolyte exchange opening of the negative electrode liquid storage tank.

[0046] A second switching valve is arranged in a bottom exchange pipeline between the bottom electrolyte exchange port of the positive electrode liquid storage tank and the bottom electrolyte exchange port of the negative electrode liquid storage tank.

[0047] The technical scheme provided by the application comprises the following steps: a plurality of stack setting units are arranged in a stack setting module in a liquid flow battery multi-stack cascade test system, a plurality of stack setting groups are arranged in each stack setting unit, and a plurality of stack setting mechanisms are arranged in each stack setting group, the stack setting mechanism is used for setting a stack, a series and / or parallel connection mode of a plurality of stacks in the liquid flow battery multi-stack cascade test system is realized, and a stack positive electrode liquid inlet, a stack negative electrode liquid inlet, a stack positive electrode liquid outlet and a stack negative electrode liquid outlet are arranged in the stack setting mechanism, so that the positive electrode electrolyte and the negative electrode electrolyte can flow between the stacks, and the stacks can perform an oxidation-reduction reaction to realize a charging and discharging process; a positive electrode liquid storage tank, a negative electrode liquid storage tank, a positive electrode main liquid inlet pipeline, a positive electrode auxiliary liquid inlet pipeline, a plurality of positive electrode liquid inlet branch pipelines, a positive electrode main liquid return pipeline, a plurality of positive electrode liquid return branch pipelines, a negative electrode main liquid inlet pipeline, a negative electrode auxiliary liquid inlet pipeline, a plurality of negative electrode liquid inlet branch pipelines, a negative electrode main liquid return pipeline and a plurality of negative electrode liquid return branch pipelines are arranged in an electrolyte circulation module in the liquid flow battery multi-stack cascade test system, so that the positive / negative electrode electrolyte can be transmitted to the stack positive / negative electrode liquid inlets of the stack setting mechanisms in each stack setting group through each positive / negative electrode pipeline liquid outlet group and each positive / negative electrode pipeline liquid outlet in each positive electrode liquid inlet branch pipeline, thereby enabling the positive / negative electrode electrolyte to be delivered to each stack in the liquid flow battery multi-stack cascade test system; meanwhile, the positive / negative electrode products after the oxidation-reduction reaction of each stack setting mechanism in each stack setting group are delivered back to the positive electrode liquid storage tank or the negative electrode liquid storage tank through each positive / negative electrode pipeline liquid return outlet group and each positive / negative electrode pipeline liquid return outlet in each positive / negative electrode liquid return branch pipeline, thereby realizing the circulation flow of the positive / negative electrode electrolyte between the positive electrode liquid storage tank or the negative electrode liquid storage tank and each stack. In addition, at least one positive electrode auxiliary liquid inlet and at least one first control valve are arranged in the positive electrode liquid inlet branch pipeline, a second control valve is arranged in the positive electrode auxiliary liquid inlet pipeline between the auxiliary liquid outlet of the positive electrode liquid storage tank and the positive electrode auxiliary liquid inlet, at least one negative electrode auxiliary liquid inlet and at least one third control valve are arranged in the negative electrode liquid inlet branch pipeline, and a fourth control valve is arranged in the negative electrode auxiliary liquid inlet pipeline between the auxiliary liquid outlet of the negative electrode liquid storage tank and the negative electrode auxiliary liquid inlet, different liquid supply modes of the positive electrode main liquid inlet pipeline, the positive electrode auxiliary liquid inlet pipeline, the negative electrode main liquid inlet pipeline and the negative electrode auxiliary liquid inlet pipeline can be realized by controlling the on-off state of each control valve, thereby realizing a plurality of liquid supply modes in the liquid flow battery multi-stack cascade test system, so as to monitor the influence of different liquid supply modes on the charging and discharging efficiency of the liquid flow battery energy storage system.

[0048] It is to be understood that the details set forth herein do not limit the scope of the embodiments of the application to the specific embodiments described. The foregoing detailed description has set forth various embodiments of the devices and / or processes via the use of specific terminology. However, embodiments of the application are not necessarily limited to those described, but can be practiced with the BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative effort based on these drawings.

[0050] Figure 1 is a structural schematic diagram of a liquid flow battery multi-stack cascade test system provided by an embodiment of the present application;

[0051] Figure 2 is a structural schematic diagram of another liquid flow battery multi-stack cascade test system provided by an embodiment of the present application;

[0052] Figure 3 is a structural schematic diagram of a positive electrode liquid storage tank and a negative electrode liquid storage tank provided by an embodiment of the present application;

[0053] Figure 4 is a structural schematic diagram of another liquid flow battery multi-stack cascade test system provided by an embodiment of the present application;

[0054] Figure 5 is a structural schematic diagram of another liquid flow battery multi-stack cascade test system provided by an embodiment of the present application. DETAILED DESCRIPTION

[0055] In order to make the technical personnel in the art better understand the present application scheme, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort should belong to the scope of protection of the present application.

[0056] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application and in the above-described drawings are intended to distinguish similar objects and not necessarily to describe a particular chronological or sequential order. It should be understood that the data thus used can be interchanged, where appropriate, so that the embodiments of the application described herein can be practiced in other than the illustrated or described order. Furthermore, the terms "comprise" and "have" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or apparatus that includes a list of steps or units not necessarily limited to those clearly identified as such, but can include other not clearly recited steps or units inherent in such process, method, product, or apparatus.

[0057] Figure 1 is a structural schematic diagram of a liquid flow battery multi-stack cascade test system provided by an embodiment of the present application, which includes a stack setting module and an electrolyte circulating module. The stack setting module is used for setting the stack, and the electrolyte circulating module can make the electrolyte flow in the stack.

[0058] In the above, the stack setting module includes a plurality of stack setting units; each stack setting unit includes a plurality of stack setting groups; each stack setting group includes at least one stack setting mechanism; the stack setting mechanism is used for setting the stack; the stack setting mechanism includes a stack positive electrode liquid inlet, a stack negative electrode liquid inlet, a stack positive electrode liquid outlet, and a stack negative electrode liquid outlet; each stack is connected in series in the same stack setting unit, and each stack is connected in parallel in different stack setting units.

[0059] The electrolyte circulation module comprises a positive electrode storage tank 41, a negative electrode storage tank 42, a positive electrode main liquid inlet pipeline 51, a positive electrode auxiliary liquid inlet pipeline 52, a plurality of positive electrode liquid inlet branch pipelines, a positive electrode main liquid return pipeline 53, a plurality of positive electrode liquid return branch pipelines, a negative electrode main liquid inlet pipeline 54, a negative electrode auxiliary liquid inlet pipeline 55, a plurality of negative electrode liquid inlet branch pipelines, a negative electrode main liquid return pipeline 56 and a plurality of negative electrode liquid return branch pipelines; the positive electrode main liquid inlet pipeline 51 is in communication with the main liquid outlet of the positive electrode storage tank 41 and each positive electrode liquid inlet branch pipeline; each positive electrode liquid inlet branch pipeline corresponds to each stack setting unit; the positive electrode liquid inlet branch pipeline comprises a plurality of positive electrode pipeline liquid outlet groups corresponding to a plurality of stack setting groups in the stack setting unit; each positive electrode pipeline liquid outlet group comprises at least one positive electrode pipeline liquid outlet corresponding to at least one stack setting mechanism in the stack setting group; the positive electrode pipeline liquid outlet is in communication with the positive electrode liquid inlet of the stack; the positive electrode liquid inlet branch pipeline is further provided with at least one positive electrode auxiliary liquid inlet and at least one first control valve; the positive electrode auxiliary liquid inlet and the first control valve are located in the positive electrode liquid inlet branch pipeline between adjacent two stack setting groups in the same stack setting unit; the positive electrode auxiliary liquid inlet pipeline is in communication with the auxiliary liquid outlet of the positive electrode storage tank 41 and each positive electrode auxiliary liquid inlet; the second control valve is arranged in the positive electrode auxiliary liquid inlet pipeline 52 between the auxiliary liquid outlet of the positive electrode storage tank 41 and the positive electrode auxiliary liquid inlet; the positive electrode main liquid return pipeline 53 is in communication with the main liquid return of the positive electrode storage tank 41 and each positive electrode liquid return branch pipeline; each positive electrode liquid return branch pipeline corresponds to each stack setting unit; the positive electrode liquid return branch pipeline comprises a plurality of positive electrode pipeline liquid return groups corresponding to a plurality of stack setting groups in the stack setting unit; each positive electrode pipeline liquid return group comprises at least one positive electrode pipeline liquid return corresponding to at least one stack setting mechanism in the stack setting group; the positive electrode pipeline liquid return is in communication with the positive electrode liquid outlet of the stack; the negative electrode main liquid inlet pipeline 54 is in communication with the main liquid outlet of the negative electrode storage tank 42 and each negative electrode liquid inlet branch pipeline; each negative electrode liquid inlet branch pipeline corresponds to each stack setting unit; the negative electrode liquid inlet branch pipeline comprises a plurality of negative electrode pipeline liquid outlet groups corresponding to a plurality of stack setting groups in the stack setting unit; each negative electrode pipeline liquid outlet group comprises at least one negative electrode pipeline liquid outlet corresponding to at least one stack setting mechanism in the stack setting group; the negative electrode pipeline liquid outlet is in communication with the negative electrode liquid inlet of the stack; the negative electrode liquid inlet branch pipeline is further provided with at least one negative electrode auxiliary liquid inlet and at least one third control valve; the negative electrode auxiliary liquid inlet and the third control valve are located in the negative electrode liquid inlet branch pipeline between adjacent two stack setting groups in the same stack setting unit; the negative electrode auxiliary liquid inlet pipeline is in communication with the auxiliary liquid outlet of the negative electrode storage tank 42 and each negative electrode auxiliary liquid inlet; the fourth control valve is arranged in the negative electrode auxiliary liquid inlet pipeline 55 between the auxiliary liquid outlet of the negative electrode storage tank 42 and the negative electrode auxiliary liquid inlet; the negative electrode main liquid return pipeline 56 is in communication with the main liquid return of the negative electrode storage tank 42 and each negative electrode liquid return branch pipeline.Each negative liquid return branch pipeline corresponds to each stack setting unit one by one; the negative liquid return branch pipeline comprises a plurality of negative pipeline liquid return port groups corresponding to a plurality of stack setting groups in the stack setting unit; the negative pipeline liquid return port group comprises at least one negative pipeline liquid return port corresponding to at least one stack setting mechanism in the stack setting group; the negative pipeline liquid return port is in communication with the stack negative liquid outlet.

[0060] The stack setting module can be specifically used for organizing and managing the arrangement and connection of the plurality of stacks in the liquid flow battery multi-stack cascade test system, and can comprise a plurality of stack setting units. Each stack setting unit can comprise a plurality of stack setting groups, and each stack setting group can comprise one or more stack setting mechanisms. The stack setting mechanism is used for mounting and fixing the stack, and each stack setting mechanism comprises a stack positive liquid inlet, a stack negative liquid inlet, a stack positive liquid outlet and a stack negative liquid outlet, so that the positive electrolyte can flow between the stacks through the stack positive liquid inlet and the stack positive liquid outlet, and the negative electrolyte can flow between the stacks through the stack negative liquid inlet and the stack negative liquid outlet, so that the stack can perform an oxidation-reduction reaction to realize the charging and discharging process.

[0061] It can be understood that the number of stack setting units in the stack setting module, the number of stack setting groups included in each setting unit and the number of stack setting mechanisms included in the stack setting group can be adjusted and set according to actual conditions, and the present application does not make specific limitations thereon. The plurality of stacks provided in the stack setting module can be connected in series and / or in parallel, wherein the stacks provided in the same stack setting unit are connected in series, and the stacks provided in different stack setting units are connected in parallel. It can be understood that the stacks in the same stack setting unit belong to the same stack cluster, and the stacks in the same stack cluster are connected in series. The stacks in different stack setting units belong to different stack clusters, and the stacks in different stack clusters are connected in parallel.

[0062] It should be noted that the series and parallel connection of each stack is the electrical connection mode of each stack, that is, the transmission mode of the electrical signal between the stacks, and is not the mechanical connection mode of the stack, and the specific implementation mode of the series and parallel connection of each stack can be designed according to actual needs, and the present application does not make specific limitations thereon.

[0063] In an exemplary embodiment, continuing to refer to Figure 1The stack setting module includes two stack setting units, i.e. a first stack setting unit 11 and a second stack setting unit 12. Each stack setting unit includes two stack setting groups. For example, the first stack setting unit 11 includes a first stack setting group 21 and a second stack setting group 22. The second stack setting unit 12 includes a third stack setting group 23 and a fourth stack setting group 24. Each stack setting group includes three stack setting mechanisms. For example, the first stack setting group 21 includes a first stack setting mechanism 31, a second stack setting mechanism 32 and a third stack setting mechanism 33. The stacks arranged in the first stack setting unit 11 are connected in series. The stacks arranged in the second stack setting unit 12 are connected in series. The stacks arranged in the first stack setting unit 11 and the stacks arranged in the second stack setting unit 12 are connected in parallel.

[0064] In another exemplary embodiment, as shown in Figure 2 The stack setting module includes three stack setting units, i.e. a first stack setting unit 11, a second stack setting unit 12 and a third stack setting unit 13. Each stack setting unit includes two stack setting groups. For example, the first stack setting unit 11 includes a first stack setting group 21 and a second stack setting group 22. The second stack setting unit 12 includes a third stack setting group 23 and a fourth stack setting group 24. The third stack setting unit 13 includes a fifth stack setting group 25 and a sixth stack setting group 26. Each stack setting group includes three stack setting mechanisms. For example, the first stack setting group 21 includes a first stack setting mechanism 31, a second stack setting mechanism 32 and a third stack setting mechanism 33. The stacks arranged in the first stack setting unit 11 are connected in series. The stacks arranged in the second stack setting unit 12 are connected in series. The stacks arranged in the third stack setting unit 13 are connected in series. The stacks arranged in the first stack setting unit 11, the stacks arranged in the second stack setting unit 12 and the stacks arranged in the third stack setting unit 13 are connected in parallel.

[0065] For the convenience of description, without special limitation, the technical solutions of the embodiments of the present application are exemplarily described by taking an example of the stack setting module including two stack setting units, each stack setting unit including two stack setting groups, and each stack setting group including three stacks.

[0066] Continuing to refer to Figure 1The electrolyte circulation module includes a positive electrolyte storage tank 41 and a negative electrolyte storage tank 42. The positive electrolyte storage tank 41 can be understood as a container for storing positive electrolyte. The positive electrolyte storage tank 41 includes a container structure and corresponding main liquid outlet, auxiliary liquid outlet and main liquid return port, to store and deliver positive electrolyte to the stack setting mechanism, and collect the positive product after the redox reaction of the stack. The negative electrolyte storage tank 42 can be understood as a container for storing negative electrolyte. The negative electrolyte storage tank 42 includes a container structure and corresponding main liquid outlet, auxiliary liquid outlet and main liquid return port, to store and deliver negative electrolyte to the stack setting mechanism, and collect the negative product after the redox reaction of the stack.

[0067] The electrolyte circulation module further includes a positive main liquid inlet pipeline 51, which is in communication with the main liquid outlet of the positive electrolyte storage tank 41 and each positive liquid inlet branch pipeline. The positive liquid inlet branch pipeline includes a first positive liquid inlet branch pipeline 511 and a second positive liquid inlet branch pipeline 512. The first positive liquid inlet branch pipeline 511 corresponds to the first stack setting unit 11, so that the positive electrolyte in the positive electrolyte storage tank 41 can be delivered to each stack in the first stack setting unit 11 through the positive main liquid inlet pipeline 51 and the first positive liquid inlet branch pipeline 511. The second positive liquid inlet branch pipeline 512 corresponds to the second stack setting unit 12, so that the positive electrolyte stored in the positive electrolyte storage tank 41 can be delivered to each stack in the second stack setting unit 12 through the positive main liquid inlet pipeline 51 and the second positive liquid inlet branch pipeline 523. The first positive liquid inlet branch pipeline 511 includes a first positive pipeline liquid outlet group 5111 corresponding to the first stack setting group 21 in the first stack setting unit 11 and a second positive pipeline liquid outlet group 5112 corresponding to the second stack setting group 22 in the first stack setting unit 11. The first positive pipeline liquid outlet group 5111 includes a first positive pipeline liquid outlet 1A corresponding to the first stack setting mechanism 31 in the first stack setting group 21, a second positive pipeline liquid outlet 2A corresponding to the second stack setting mechanism 32 in the first stack setting group 21, and a third positive pipeline liquid outlet 3A corresponding to the third stack setting mechanism 33 in the first stack setting group 21. The first positive pipeline liquid outlet 1A is in communication with the stack positive liquid inlet of the first stack setting mechanism 31, the second positive pipeline liquid outlet 2A is in communication with the stack positive liquid inlet of the second stack setting mechanism 32, and the third positive pipeline liquid outlet 3A is in communication with the stack positive liquid inlet of the third stack setting mechanism 33, so that the positive electrolyte can be delivered to the stack positive liquid inlet of each stack setting mechanism in each stack setting group through each positive pipeline liquid outlet group and each positive pipeline liquid outlet in each positive liquid inlet branch pipeline, thereby delivering positive electrolyte to each stack in the liquid flow battery multi-stack cascade test system. By analogy, other stack setting groups have similar settings. The same can be referred to the description above, which will not be repeated here.

[0068] Correspondingly, one or more positive auxiliary liquid inlets and one or more first control valves are also arranged in the positive liquid inlet branch pipeline. For example, the first positive liquid inlet branch pipeline 511 includes a first positive auxiliary liquid inlet 521 and a first first control valve 522, and the first positive auxiliary liquid inlet 521 and the first first control valve 522 are arranged in the first positive liquid inlet branch pipeline 511 between the first stack setting group 21 and the second stack setting group 22 in the first stack setting unit 11. The second positive liquid inlet branch pipeline 512 includes a second positive auxiliary liquid inlet 523 and a second first control valve 524, and the second positive auxiliary liquid inlet 523 and the second first control valve 524 are arranged in the second positive liquid inlet branch pipeline 512 between the third stack setting group 23 and the fourth stack setting group 24 in the second stack setting unit 12. The positive auxiliary liquid pipeline 52 is in communication with the auxiliary liquid outlet of the positive liquid storage tank 41, the first positive auxiliary liquid inlet 521 and the second positive auxiliary liquid inlet 523, respectively, and the second control valve 525 is arranged in the positive auxiliary liquid pipeline 52 between the auxiliary liquid outlet of the positive liquid storage tank 41 and the second positive auxiliary liquid inlet 523. It can be understood that by controlling the opening and closing states of the first first control valve 522, the second first control valve 524 and the second control valve 525, different liquid supply modes of the flow battery multi-stack cascade test system can be realized.

[0069] For example, when the second control valve 525 is controlled to be in the closed state, and the first first control valve 522 and the second first control valve 524 are controlled to be in the open state, the positive electrolyte can be transmitted from the main outlet of the positive electrolyte tank 41 to the first positive electrolyte inlet branch pipeline 511 and the second positive electrolyte inlet branch pipeline 512 through the positive main electrolyte inlet pipeline 51, and then transmitted to the positive electrolyte inlet of each stack setting mechanism in the first stack setting group 21 and the second stack setting group 22 through the first positive electrolyte inlet branch pipeline 511, and transmitted to the positive electrolyte inlet of each stack setting mechanism in the third stack setting group 23 and the fourth stack setting group 24 through the second positive electrolyte inlet branch pipeline 512. At this time, if the second control valve 525 is controlled to be in the open state, and the first first control valve 522 and the second first control valve 524 are controlled to be in the closed state, the positive electrolyte can be transmitted from the main outlet of the positive electrolyte tank 41 to the first positive electrolyte inlet branch pipeline 511 and the second positive electrolyte inlet branch pipeline 512 through the positive main electrolyte inlet pipeline 51, and then transmitted to the positive electrolyte inlet of each stack setting mechanism in the first stack setting group 21 through the first positive electrolyte inlet branch pipeline 511, and transmitted to the positive electrolyte inlet of each stack setting mechanism in the third stack setting group 23 through the second positive electrolyte inlet branch pipeline 512. At the same time, the positive electrolyte can be transmitted from the auxiliary outlet of the positive electrolyte tank 41 to the positive electrolyte inlet of each stack setting mechanism in the second stack setting group 22 through the positive auxiliary electrolyte inlet pipeline 52 and the first positive auxiliary electrolyte inlet 521, and transmitted to the positive electrolyte inlet of each stack setting mechanism in the fourth stack setting group 24 through the positive auxiliary electrolyte inlet pipeline 52 and the second positive auxiliary electrolyte inlet 523, so as to realize the electrolyte supply mode of supplying electrolyte to each stack in the flow battery multi-stack cascade test system through the positive main electrolyte inlet pipeline and the positive auxiliary electrolyte inlet pipeline.

[0070] With continued reference to Figure 1The positive electrode main liquid return pipe 53 is in communication with the main liquid return port of the positive electrode liquid storage tank 41 and each positive electrode liquid return branch pipe, respectively. The positive electrode liquid return branch pipe includes a first positive electrode liquid return branch pipe 531 and a second positive electrode liquid return branch pipe 532. The first positive electrode liquid return branch pipe 531 corresponds to the first stack setting unit 11, so that the positive electrode products after the redox reaction of each stack in the first stack setting unit 11 can be sequentially transported back to the positive electrode liquid storage tank 41 through the first positive electrode liquid return branch pipe 531 and the positive electrode main liquid return pipe 53. The second positive electrode liquid return branch pipe 532 corresponds to the second stack setting unit 12, so that the positive electrode products after the redox reaction of each stack in the second stack setting unit 12 can be sequentially transported back to the positive electrode liquid storage tank 41 through the second positive electrode liquid return branch pipe 532 and the positive electrode main liquid return pipe 53. The first positive electrode liquid return branch pipe 531 includes a first positive electrode pipe liquid return port group 5311 corresponding to the first stack setting group 21 in the first stack setting unit 11 and a second positive electrode pipe liquid return port group 5312 corresponding to the second stack setting group 22 in the first stack setting unit 11. The first positive electrode pipe liquid return port group 5311 includes a first positive electrode pipe liquid return port 1B corresponding to the first stack setting mechanism 31 in the first stack setting unit 11, a second positive electrode pipe liquid return port 2B corresponding to the second stack setting mechanism 32 in the first stack setting unit 11, and a third positive electrode pipe liquid return port 3B corresponding to the third stack setting mechanism 33 in the first stack setting unit 11. The first positive electrode pipe liquid return port 1B is in communication with the stack positive electrode liquid outlet port of the first stack setting mechanism 31. The second positive electrode pipe liquid return port 2B is in communication with the stack positive electrode liquid outlet port of the second stack setting mechanism 32. The third positive electrode pipe liquid return port 3B is in communication with the stack positive electrode liquid outlet port of the third stack setting mechanism 33. In this way, the positive electrode products after the redox reaction of each stack setting mechanism in each stack setting group are transported back to the positive electrode liquid storage tank 41 through each positive electrode pipe liquid return port group and each positive electrode pipe liquid return port in each positive electrode liquid return branch pipe, thereby realizing the flow of positive electrode electrolyte between the positive electrode liquid storage tank 41 and each stack. Similarly, the other stack setting groups have similar settings. The same can be referred to the description above.

[0071] With reference to Figure 1The electrolyte circulation module further comprises a negative electrode main liquid inlet pipeline 54, which is in communication with the main liquid outlet of the negative electrode liquid storage tank 42 and each negative electrode liquid inlet branch pipeline. The negative electrode liquid inlet branch pipeline comprises a first negative electrode liquid inlet branch pipeline 541 and a second negative electrode liquid inlet branch pipeline 542. The first negative electrode liquid inlet branch pipeline 541 corresponds to the first stack setting unit 11, so that the negative electrode electrolyte stored in the negative electrode liquid storage tank 42 can be sequentially delivered to each stack in the first stack setting unit 11 through the negative electrode main liquid inlet pipeline 54 and the first negative electrode liquid inlet branch pipeline 541. The second negative electrode liquid inlet branch pipeline 542 corresponds to the second stack setting unit 12, so that the negative electrode electrolyte stored in the negative electrode liquid storage tank 42 can be sequentially delivered to each stack in the second stack setting unit 12 through the negative electrode main liquid inlet pipeline 54 and the second negative electrode liquid inlet branch pipeline 542. The first negative electrode liquid inlet branch pipeline 541 comprises a first negative electrode pipeline liquid outlet group 5411 corresponding to the first stack setting group 21 in the first stack setting unit 11 and a second negative electrode pipeline liquid outlet group 5412 corresponding to the second stack setting group 22 in the first stack setting unit 11. The first negative electrode pipeline liquid outlet group 5411 comprises a first negative electrode pipeline liquid outlet 1C corresponding to the first stack setting mechanism 31 in the first stack setting unit 11, a second negative electrode pipeline liquid outlet 2C corresponding to the second stack setting mechanism 32 in the first stack setting unit 11, and a third negative electrode pipeline liquid outlet 3C corresponding to the third stack setting mechanism 33 in the first stack setting unit 11. The first negative electrode pipeline liquid outlet 1C is in communication with the stack negative electrode liquid inlet of the first stack setting mechanism 31. The second negative electrode pipeline liquid outlet 2C is in communication with the stack negative electrode liquid inlet of the second stack setting mechanism 32. The third negative electrode pipeline liquid outlet 3C is in communication with the stack negative electrode liquid inlet of the third stack setting mechanism 33. In this way, the negative electrode electrolyte can be delivered to the stack negative electrode liquid inlet of each stack setting mechanism in each stack setting group through each negative electrode pipeline liquid outlet group and each negative electrode pipeline liquid outlet in each negative electrode liquid inlet branch pipeline, so as to deliver the negative electrode electrolyte to each stack in the liquid flow battery multi-stack cascade test system. Similarly, the other stack setting groups have similar settings. The same can be referred to the description above.

[0072] Correspondingly, one or more negative auxiliary liquid inlet and one or more third control valves are arranged in the negative liquid inlet branch pipeline, for example, the first negative liquid inlet branch pipeline 511 includes a first negative auxiliary liquid inlet 551 and a first third control valve 552, wherein the first negative auxiliary liquid inlet 551 and the first third control valve 552 are arranged in the first negative liquid inlet branch pipeline 541 between the first stack setting group 21 and the second stack setting group 22 in the first stack setting unit 11. The second negative liquid inlet branch pipeline 512 includes a second negative auxiliary liquid inlet 553 and a second third control valve 554, wherein the second negative auxiliary liquid inlet 553 and the second third control valve 554 are arranged in the second negative liquid inlet branch pipeline 542 between the third stack setting group 23 and the fourth stack setting group 24 in the second stack setting unit 12. The negative auxiliary liquid inlet pipeline 55 is in communication with the auxiliary liquid outlet of the negative liquid storage tank 42, the first negative auxiliary liquid inlet 551 and the second negative auxiliary liquid inlet 553, respectively, and the fourth control valve 555 is arranged in the negative auxiliary liquid inlet pipeline 55 between the auxiliary liquid outlet of the negative liquid storage tank 42 and the second negative auxiliary liquid inlet 553. It can be understood that by controlling the opening and closing states of the first third control valve 552, the second third control valve 554 and the fourth control valve 555, different liquid supply modes of the flow battery multi-stack cascade test system can be realized.

[0073] For example, when the fourth control valve 555 is controlled to be in the closed state, and the first and second third control valves 552 and 554 are controlled to be in the open state, the negative electrolyte can only be transmitted from the main outlet of the negative electrolyte tank 42 to the first and second negative electrolyte inlet branch pipes 541 and 542 through the negative main electrolyte inlet pipe 54, and then transmitted to the negative electrolyte inlet of each stack setting mechanism in the first and second stack setting groups 21 and 22 through the first negative electrolyte inlet branch pipe 541, and to the negative electrolyte inlets of each stack setting mechanism in the third stack setting group 23 and the fourth stack setting group 24 through the second negative electrolyte inlet branch pipe 542. At this time, if the fourth control valve 555 is controlled to be in the open state, and the first and second third control valves 552 and 554 are controlled to be in the closed state, the negative electrolyte can be transmitted from the main outlet of the negative electrolyte tank 42 to the first and second negative electrolyte inlet branch pipes 541 and 542 through the negative main electrolyte inlet pipe 54, and then transmitted to the negative electrolyte inlets of each stack setting mechanism in the second stack setting group 22 through the first negative electrolyte inlet branch pipe 541, and to the negative electrolyte inlets of each stack setting mechanism in the fourth stack setting group 24 through the second negative electrolyte inlet branch pipe 542. At the same time, the negative electrolyte can be transmitted from the auxiliary outlet of the negative electrolyte tank 42 to the negative electrolyte inlets of each stack setting mechanism in the first stack setting group 21 through the first negative auxiliary electrolyte inlet pipe 551, and to the negative electrolyte inlets of each stack setting mechanism in the third stack setting group 23 through the second negative auxiliary electrolyte inlet pipe 553, so as to realize the liquid supply mode of supplying the negative electrolyte to each stack in the liquid flow battery multi-stack cascade test system through the negative main electrolyte inlet pipe and the negative auxiliary electrolyte inlet pipe.

[0074] With continued reference to Figure 1The auxiliary negative electrolyte return pipe 56 is in communication with the main electrolyte return port of the negative electrolyte storage tank 42 and each negative electrolyte return branch pipe. The negative electrolyte return branch pipe includes a first negative electrolyte return branch pipe 561 and a second negative electrolyte return branch pipe 562. The first negative electrolyte return branch pipe 561 corresponds to the first stack setting unit 11, so that the negative products after the redox reaction of each stack in the first stack setting unit 11 can be sequentially transported back to the negative electrolyte storage tank 42 through the first negative electrolyte return branch pipe 561 and the auxiliary negative electrolyte return pipe 56. The second negative electrolyte return branch pipe 562 corresponds to the second stack setting unit 12, so that the negative products after the redox reaction of each stack in the second stack setting unit 12 can be sequentially transported back to the negative electrolyte storage tank 42 through the second negative electrolyte return branch pipe 562 and the auxiliary negative electrolyte return pipe 56. The first negative electrolyte return branch pipe 561 includes a first negative pipe return port group 5611 corresponding to the first stack setting group 21 in the first stack setting unit 11 and a second negative pipe return port group 5612 corresponding to the second stack setting group 22 in the first stack setting unit 11. The first negative pipe return port group 5611 includes a first negative pipe return port 1D corresponding to the first stack setting mechanism 31 in the first stack setting unit 11, a second negative pipe return port 2D corresponding to the second stack setting mechanism 32 in the first stack setting unit 11, and a third negative pipe return port 3D corresponding to the third stack setting mechanism 33 in the first stack setting unit 11. The first negative pipe return port 1D is in communication with the stack negative electrolyte outlet port of the first stack setting mechanism 31. The second negative pipe return port 2D is in communication with the stack negative electrolyte outlet port of the second stack setting mechanism 32. The third negative pipe return port 3D is in communication with the stack negative electrolyte outlet port of the third stack setting mechanism 33. The negative products after the redox reaction of each stack setting mechanism in each stack setting group are transported back to the negative electrolyte storage tank 42 through each negative pipe return port group and each negative pipe return port in each negative electrolyte return branch pipe, thereby realizing the flow of negative electrolyte between the negative electrolyte storage tank 42 and each stack. Similarly, the other stack setting groups have similar settings. The same can be referred to the description above.

[0075] It can be understood that the opening and closing modes of each first control valve, each second control valve, each third control valve and each fourth control valve in the electrolyte circulation module can be independently set according to actual conditions, that is, the opening and closing modes of each first control valve, each second control valve, each third control valve and each fourth control valve can have multiple combinations to realize multiple liquid supply modes in the liquid flow battery multi-stack cascade test system. For example, when the second control valve is controlled to be in a closed state, and the first first control valve and the second first control valve are both controlled to be in an open state, the fourth control valve can be controlled to be in an open state, and the first third control valve and the second third control valve are both controlled to be in a closed state, and so on. The control valves in the electrolyte circulation module can also have similar opening and closing combination modes, which will not be described here.

[0076] It can also be understood that the relative position relationship between the control valve in the liquid inlet branch pipeline between the adjacent two stack setting groups in the same stack setting unit and the auxiliary liquid inlet can be that the control valve can be located on the side of the liquid inlet close to the main liquid inlet pipeline. Correspondingly, the relative position relationship between the control valve in the liquid return branch pipeline between the adjacent two stack setting groups in the same stack setting unit and the auxiliary liquid return can be that the control valve can be located on the side of the liquid return close to the main liquid inlet pipeline. The specific setting mode can be designed according to actual needs, and the embodiments of the present application do not make specific limitations thereto.

[0077] In the embodiment, a plurality of stack setting units are arranged in the stack setting module of the flow battery multi-stack cascade test system, a plurality of stack setting groups are arranged in each stack setting unit, and a plurality of stack setting mechanisms are arranged in each stack setting group. The stack setting mechanism is used to set the stack to realize the series and / or parallel connection mode of the plurality of stacks in the flow battery multi-stack cascade test system. The stack anode liquid inlet, the stack cathode liquid inlet, the stack anode liquid outlet and the stack cathode liquid outlet are arranged in the stack setting mechanism, so that the positive electrolyte and the negative electrolyte can flow between the stacks, and the stacks can perform the oxidation-reduction reaction to realize the charging and discharging process. The positive electrolyte tank and the negative electrolyte tank, the positive main liquid inlet pipeline, the positive auxiliary liquid inlet pipeline, the plurality of positive liquid inlet branch pipelines, the positive main liquid return pipeline, the plurality of positive liquid return branch pipelines, the negative main liquid inlet pipeline, the negative auxiliary liquid inlet pipeline, the plurality of negative liquid inlet branch pipelines, the negative main liquid return pipeline and the plurality of negative liquid return branch pipelines are arranged in the electrolyte circulation module of the flow battery multi-stack cascade test system. The positive / negative electrolyte can be transmitted to the stack anode / negative anode inlet of each stack setting mechanism in each stack setting group through each positive / negative pipeline liquid outlet group and each positive / negative pipeline liquid outlet in each positive liquid inlet branch pipeline, so that the positive / negative electrolyte can be delivered to each stack in the flow battery multi-stack cascade test system. At the same time, the positive / negative products after the oxidation-reduction reaction of each stack setting mechanism in each stack setting group are delivered back to the positive electrolyte tank or the negative electrolyte tank through each positive / negative pipeline liquid return port group and each positive / negative pipeline liquid return port in each positive / negative liquid return branch pipeline, so that the positive / negative electrolyte can be circulated and flowed between the positive electrolyte tank or the negative electrolyte tank and each stack. In addition, at least one positive auxiliary liquid inlet and at least one first control valve are arranged in the positive liquid inlet branch pipeline, a second control valve is arranged in the positive auxiliary liquid inlet pipeline between the auxiliary liquid outlet of the positive electrolyte tank and the positive auxiliary liquid inlet, at least one negative auxiliary liquid inlet and at least one third control valve are arranged in the negative liquid inlet branch pipeline, and a fourth control valve is arranged in the negative auxiliary liquid inlet pipeline between the auxiliary liquid outlet of the negative electrolyte tank and the negative auxiliary liquid inlet. By controlling the opening and closing states of the control valves, different liquid supply modes of the positive main liquid inlet pipeline, the positive auxiliary liquid inlet pipeline, the negative main liquid inlet pipeline and the negative auxiliary liquid inlet pipeline can be realized, so that a plurality of liquid supply modes in the flow battery multi-stack cascade test system can be realized to monitor the influence of different liquid supply modes on the charging and discharging efficiency of the flow battery energy storage system.

[0078] Optionally, the flow battery multi-stack cascade test system further comprises at least one fifth control valve and at least one sixth control valve; the fifth control valve is arranged in the positive auxiliary liquid inlet pipeline between two adjacent positive auxiliary liquid inlets; and the sixth control valve is arranged in the negative auxiliary liquid inlet pipeline between two adjacent negative auxiliary liquid inlets.

[0079] Specifically, the multi-stack cascade test system for flow batteries also includes one or more fifth control valves and one or more sixth control valves to enable more liquid supply methods for the multi-stack cascade test system for flow batteries.

[0080] For example, continue to refer to Figure 1 A fifth control valve 526 is installed in the positive electrode auxiliary inlet pipeline 52 between the first positive electrode auxiliary inlet 521 and the second positive electrode auxiliary inlet 523. When the fifth control valve 526 is closed, and the second control valve 525 is open, the first control valve 522 is closed, and the second control valve 524 is open, the positive electrode electrolyte can be transferred from the main outlet of the positive electrode storage tank 41 through the positive electrode main inlet pipeline 51 to the first positive electrode inlet branch pipeline 511 and the second positive electrode inlet branch pipeline 512, and then from the first positive electrode inlet branch pipeline 511 to the first positive electrode inlet branch pipeline 512. The positive electrode liquid inlet of each fuel cell stack assembly in fuel cell stack assembly group 21, and the positive electrode liquid inlet of each fuel cell stack assembly in group 23 and group 24, are transmitted by the second positive electrode liquid inlet branch pipe 512. Simultaneously, the positive electrode electrolyte can be transmitted from the auxiliary outlet of the positive electrode storage tank 41 through the positive electrode auxiliary liquid inlet pipe 52 and the first positive electrode auxiliary liquid inlet 521 to the positive electrode liquid inlet of each fuel cell stack assembly in group 22. At this time, if the fifth control valve 526 is in the open state, and the second... When control valve 525 is open, control valve 522 is closed, and control valve 524 is closed, the positive electrode electrolyte can be transferred from the main outlet of the positive electrode storage tank 41 through the main positive electrode inlet pipeline 51 to the first positive electrode inlet branch pipeline 511 and the second positive electrode inlet branch pipeline 512, then from the first positive electrode inlet branch pipeline 511 to the positive electrode inlet of each stack assembly mechanism in the first stack assembly group 21, and from the second positive electrode inlet branch pipeline 512 to the positive electrode inlet of each stack assembly mechanism in the third stack assembly group 23. Simultaneously, the positive electrode electrolyte... Electrolyte can be transferred from the auxiliary outlet of the positive electrode storage tank 41 through the positive electrode auxiliary inlet pipe 52 via the positive electrode auxiliary inlet pipe 52 to the positive electrode inlet of each stack in the second stack assembly group 22, and through the first positive electrode auxiliary inlet 521 to the positive electrode inlet of each stack assembly in the fourth stack assembly group 24, via the second positive electrode auxiliary inlet 523. This enables more liquid supply methods to supply liquid to each stack in the multi-stack cascade test system of flow batteries through the positive electrode main inlet pipe and the positive electrode auxiliary inlet pipe, increasing the flexibility and adjustability of the multi-stack cascade test system of flow batteries.

[0081] For example, continue to refer to Figure 1When the sixth control valve 556 is controlled to be in the closed state, and the fourth control valve 555 is controlled to be in the open state, the first third control valve 552 is controlled to be in the closed state, and the second third control valve 554 is controlled to be in the open state, the negative electrolyte can be transmitted from the main outlet of the negative electrolyte tank 42 to the first positive electrolyte inlet branch pipeline 541 and the second positive electrolyte inlet branch pipeline 542 through the negative main electrolyte inlet pipeline 51 and the negative main electrolyte inlet pipeline 54, respectively, and then transmitted to the stack negative electrolyte inlets of the stack setting mechanisms in the second stack setting group 22 through the first positive electrolyte inlet branch pipeline 541, and transmitted to the stack negative electrolyte inlets of the stack setting mechanisms in the third stack setting group 23 and the fourth stack setting group 24 through the second positive electrolyte inlet branch pipeline 542. At the same time, the negative electrolyte can be transmitted from the auxiliary outlet of the negative electrolyte tank 42 to the stack negative electrolyte inlets of the stack setting mechanisms in the first stack setting group 21 through the negative auxiliary electrolyte inlet pipeline 55 and the first negative auxiliary electrolyte inlet 551. At this time, if the sixth control valve 556 is controlled to be in the open state, and the fourth control valve 555 is controlled to be in the open state, the first third control valve 552 is controlled to be in the closed state, and the second third control valve 554 is controlled to be in the closed state, the negative electrolyte can be transmitted from the main outlet of the negative electrolyte tank 42 to the first negative electrolyte inlet branch pipeline 541 and the second negative electrolyte inlet branch pipeline 542 through the negative main electrolyte inlet pipeline 54, respectively, and then transmitted to the stack negative electrolyte inlets of the stack setting mechanisms in the second stack setting group 22 through the first negative electrolyte inlet branch pipeline 541, and transmitted to the stack negative electrolyte inlets of the stack setting mechanisms in the fourth stack setting group 24 through the second negative electrolyte inlet branch pipeline 542. At the same time, the negative electrolyte can be transmitted from the auxiliary outlet of the negative electrolyte tank 42 to the stack negative electrolyte inlets of the stack setting mechanisms in the first stack setting group 21 through the negative auxiliary electrolyte inlet pipeline 55 and the first negative auxiliary electrolyte inlet 551, and transmitted to the stack negative electrolyte inlets of the stack setting mechanisms in the third stack setting group 23 through the second negative auxiliary electrolyte inlet 553. Thus, more kinds of liquid supply modes for supplying liquid to each stack in the flow battery multi-stack cascade test system through the negative main electrolyte inlet pipeline and the negative auxiliary electrolyte inlet pipeline can be realized, and the flexibility and adjustability of the flow battery multi-stack cascade test system are increased.

[0082] Optionally, continuing to refer to Figure 1The flow battery multi-stack cascade test system further comprises a first temperature management module 6; the first temperature management module 6 comprises a heat exchange liquid inlet 61 and a heat exchange liquid outlet 62; the heat exchange liquid inlet 61 is communicated with the electrolyte heat exchange outlet 533 of the positive electrode main liquid return pipeline 53 through a heat exchange liquid inlet pipeline; the heat exchange liquid outlet 62 is communicated with the electrolyte heat exchange inlet 534 of the positive electrode main liquid return pipeline 53 through a heat exchange liquid outlet pipeline; the first temperature management module 6 is used at least for controlling the temperature of the electrolyte returned to the positive electrode liquid storage tank 41 through the positive electrode main liquid return pipeline 53.

[0083] The first temperature management module 6 can be specifically understood as a module for controlling and managing the temperature of the electrolyte. For example, the first temperature management module 6 can comprise a heat exchanger and a cold and hot all-in-one machine. The first temperature management module 6 sends the electrolyte in the positive electrode main liquid return pipeline 53 to the heat exchanger and the cold and hot all-in-one machine through the electrolyte heat exchange outlet 533 through the heat exchange liquid inlet 61 for temperature adjustment. The heat exchanger realizes heating and refrigeration of the electrolyte through refrigerant to control the electrolyte temperature to be kept within the high-efficiency operation range of 30-35℃, avoid crystallization due to too low electrolyte temperature, and avoid affecting the redox reaction of the stack due to too high electrolyte temperature. After the first temperature management module 6 adjusts the temperature of the electrolyte, the electrolyte is re-delivered to the positive electrode main liquid return pipeline 53 through the electrolyte heat exchange inlet 534 through the heat exchange liquid outlet 62, so that the electrolyte after temperature adjustment is returned to the positive electrode liquid storage tank 41. The first temperature management module realizes control and stabilization of the temperature of the electrolyte, ensures that the flow battery multi-stack cascade test system operates under suitable temperature conditions, improves the stability and reliability of the flow battery multi-stack cascade test system, and at the same time ensures that the stack performs redox reaction under the best temperature, optimizes the performance and efficiency of the stack.

[0084] Optionally, the flow battery multi-stack cascade test system further comprises a seventh control valve 535 arranged in the positive electrode main liquid return pipeline 53 between the electrolyte heat exchange outlet 533 of the positive electrode main liquid return pipeline 53 and the electrolyte heat exchange inlet 534 of the positive electrode main liquid return pipeline 53.

[0085] Specifically, the seventh control valve 535 is arranged between the electrolyte heat exchange outlet 533 and the electrolyte heat exchange inlet 534 of the positive main electrolyte return pipeline 53. When the electrolyte in the positive main electrolyte return pipeline 53 needs to enter the first temperature management module 6 for temperature adjustment, the seventh control valve 535 is controlled to be in a closed state, so that the electrolyte in the positive main electrolyte return pipeline 53 enters the first temperature management module 6 through the electrolyte heat exchange outlet 533 for temperature adjustment, and the electrolyte after temperature adjustment flows back to the positive main electrolyte return pipeline 53 through the electrolyte heat exchange inlet 534. The flow direction of the electrolyte in the positive main electrolyte return pipeline can be accurately adjusted through the seventh control valve, so that the temperature of the electrolyte in the positive main electrolyte return pipeline can be flexibly adjusted according to the demand of the flow battery multi-stack cascade test system, the temperature management effect of the flow battery multi-stack cascade test system is optimized, and the stability and reliability of the flow battery multi-stack cascade test system are improved.

[0086] Optionally, the flow battery multi-stack cascade test system further comprises an eighth control valve 611 and / or a ninth control valve 621; the eighth control valve 611 is arranged in the heat exchange inlet pipeline; and the ninth control valve 621 is arranged in the heat exchange outlet pipeline.

[0087] Specifically, when the electrolyte in the positive main electrolyte return pipeline 53 needs to enter the first temperature management module 6 for temperature adjustment, the seventh control valve 535 is controlled to be in a closed state, and the eighth control valve 611 and the ninth control valve 621 are controlled to be in an open state, so that the electrolyte in the positive main electrolyte return pipeline 53 enters the first temperature management module 6 through the heat exchange inlet pipeline for temperature adjustment, and the electrolyte after temperature adjustment flows back to the positive main electrolyte return pipeline 53 through the heat exchange outlet pipeline. When the electrolyte in the positive main electrolyte return pipeline 53 does not need to enter the first temperature management module 6 for temperature adjustment, the seventh control valve 535 is controlled to be in an open state, and the eighth control valve 611 and the ninth control valve 621 are controlled to be in a closed state, so that the electrolyte in the positive main electrolyte return pipeline 53 does not enter the first temperature management module 6, but directly flows back to the positive electrolyte storage tank 41. By controlling the opening and closing states of the eighth control valve and the ninth control valve, and cooperating with the opening and closing states of the seventh control valve, the flow direction of the electrolyte in the positive main electrolyte return pipeline can be accurately adjusted, so that the temperature of the electrolyte in the positive main electrolyte return pipeline can be flexibly adjusted according to the demand of the flow battery multi-stack cascade test system, the temperature management effect of the flow battery multi-stack cascade test system is optimized, and the stability and reliability of the flow battery multi-stack cascade test system are improved. It can be understood that the eighth control valve 611 and the ninth control valve 621 can exist simultaneously or exist separately, and can be set according to actual conditions, which is not limited in the present application.

[0088] Optionally, as shown in FIG. 6, the flow battery multi-stack cascade test system further comprises a first temperature management module 6 and a second temperature management module 7. Figure 3As shown, the flow battery multi-stack cascade test system further comprises a second temperature management module 7, which is at least partially located in the positive electrolyte storage tank 41 and at least partially located in the negative electrolyte storage tank 42; the second temperature management module 7 is used to control the temperature of the electrolyte in the positive electrolyte storage tank 41 and the negative electrolyte storage tank 42.

[0089] Specifically, the second temperature management module 7 can be specifically understood as a module for controlling and managing the temperature of the electrolyte, which is partially located in the positive electrolyte storage tank 41 and partially located in the negative electrolyte storage tank 42; for example, the second temperature management module 7 can be a corrosion-resistant fluoroplastic heat exchanger, which includes fluoroplastic pipes arranged in the positive electrolyte storage tank 41 and the negative electrolyte storage tank 42, respectively; the fluoroplastic pipes are used to exchange heat between the cooling liquid in the fluoroplastic pipes and the electrolyte in the positive electrolyte storage tank 41 and the negative electrolyte storage tank 42, so as to control the temperature of the electrolyte in the positive electrolyte storage tank 41 and the negative electrolyte storage tank 42 to be maintained within an appropriate range. The second temperature management module realizes precise control of the temperature of the electrolyte in the positive electrolyte storage tank and the negative electrolyte storage tank, which ensures that the electrolyte maintains a proper temperature in the positive and negative electrolyte storage tanks, and improves the performance and stability of the flow battery multi-stack cascade test system.

[0090] Optionally, the flow battery multi-stack cascade test system further comprises a plurality of positive auxiliary electrolyte return pipelines, each of which corresponds to one of the stack setting units; the positive electrolyte return branch pipeline is further provided with at least one positive auxiliary electrolyte return port and at least one tenth control valve; the positive auxiliary electrolyte return port and the tenth control valve are located in the positive electrolyte return branch pipeline between the adjacent two stack setting groups in the same stack setting unit; the positive auxiliary electrolyte return pipeline is in communication with the positive auxiliary electrolyte return port and the positive main electrolyte return pipeline 53; the positive auxiliary electrolyte return pipeline between the positive auxiliary electrolyte return port and the positive main electrolyte return pipeline 53 is provided with an eleventh control valve; the plurality of negative auxiliary electrolyte return pipelines each correspond to one of the stack setting units; the negative electrolyte return branch pipeline is further provided with at least one negative auxiliary electrolyte return port and at least one twelfth control valve; the negative auxiliary electrolyte return port and the twelfth control valve are located in the negative electrolyte return branch pipeline between the adjacent two stack setting groups in the same stack setting unit; the negative auxiliary electrolyte return pipeline is in communication with the negative auxiliary electrolyte return port and the negative main electrolyte return pipeline 56; the negative auxiliary electrolyte return pipeline between the negative auxiliary electrolyte return port and the negative main electrolyte return pipeline 56 is provided with a thirteenth control valve.

[0091] Specifically, continuing to refer to Figure 1The flow battery multi-stack cascade test system includes a plurality of positive auxiliary liquid return pipelines. The first positive auxiliary liquid return pipeline 536 corresponds to the first stack setting unit 11, and the second positive auxiliary liquid return pipeline 537 corresponds to the second stack setting unit 12. The first positive auxiliary liquid return pipeline 536 is in communication with the first positive auxiliary liquid return port 538 and the positive main liquid return pipeline 53. The first positive auxiliary liquid return pipeline 536 between the first positive auxiliary liquid return port 538 and the positive main liquid return pipeline 53 is provided with the first eleventh control valve 5310. The second positive auxiliary liquid return pipeline 537 is in communication with the second positive auxiliary liquid return port 5311 and the positive main liquid return pipeline 53. The second positive auxiliary liquid return pipeline 537 between the second positive auxiliary liquid return port 5311 and the positive main liquid return pipeline 53 is provided with the second eleventh control valve 5313. It can be understood that the first positive auxiliary liquid return pipeline 536 is taken as an example for description. By controlling the on-off state of the first tenth control valve 539 and the first eleventh control valve 5310, different liquid return modes of the flow battery multi-stack cascade test system can be realized.

[0092] For example, when the positive electrolyte is provided to each stack in the second stack set 22 through the positive auxiliary liquid inlet pipeline 52, the first tenth control valve 539 is controlled to be in an open state, and the first eleventh control valve 5310 is controlled to be in a closed state, so that the positive electrolyte after redox of each stack in the second stack set 22 can flow back to the positive main liquid return pipeline 53 through the first positive liquid return branch pipeline 531 through the positive outlet of each stack setting mechanism in the second stack set 22, and then flow back to the main liquid return port of the positive liquid tank 41 through the positive main liquid return pipeline 53; when the positive electrolyte is provided to each stack in the second stack set 22 through the positive auxiliary liquid inlet pipeline 52, the first tenth control valve 539 is controlled to be in a closed state, and the first eleventh control valve 5310 is controlled to be in an open state, so that the positive electrolyte after redox of each stack in the second stack set 22 can flow back to the positive main liquid return pipeline 53 through the first positive auxiliary liquid return pipeline 536 through the positive outlet of each stack setting mechanism in the second stack set 22, and then flow back to the main liquid return port of the positive liquid tank 41 through the positive main liquid return pipeline 53, thereby realizing different liquid return modes of the flow battery multi-stack cascade test system, and improving the flexibility and adjustability of the flow battery multi-stack cascade test system.

[0093] With continued reference to Figure 1The flow battery multi-stack cascade test system includes a plurality of negative auxiliary liquid return pipelines. The first negative auxiliary liquid return pipeline 563 corresponds to the first stack setting unit 11, and the second negative auxiliary liquid return pipeline 564 corresponds to the second stack setting unit 12. The first negative liquid return branch pipeline 561 is further provided with a first negative auxiliary liquid return port 565 and a first twelfth control valve 566. The first negative auxiliary liquid return port 565 and the first twelfth control valve 566 are located in the first negative liquid return branch pipeline 561 between the first stack setting group 21 and the second stack setting group 22 in the first stack setting unit 11. The first negative auxiliary liquid return pipeline 563 is in communication with the first negative auxiliary liquid return port 565 and the negative main liquid return pipeline 56, respectively. The first negative auxiliary liquid return pipeline 563 between the first negative auxiliary liquid return port 565 and the negative main liquid return pipeline 56 is provided with a first thirteenth control valve 567. The second negative liquid return branch pipeline 562 is further provided with a second negative auxiliary liquid return port 568 and a second twelfth control valve 569. The second negative auxiliary liquid return port 568 and the second twelfth control valve 569 are located in the second negative liquid return branch pipeline 562 between the third stack setting group 23 and the fourth stack setting group 24 in the second stack setting unit 12. The second negative auxiliary liquid return pipeline 564 is in communication with the second negative auxiliary liquid return port 568 and the negative main liquid return pipeline 56, respectively. The second negative auxiliary liquid return pipeline 564 between the second negative auxiliary liquid return port 568 and the negative main liquid return pipeline 56 is provided with a second thirteenth control valve 5610. It can be understood that the first negative auxiliary liquid return pipeline 563 is taken as an example for description. By controlling the on-off state of the first twelfth control valve 566 and the first thirteenth control valve 567, different liquid return modes of the flow battery multi-stack cascade test system can be realized.

[0094] For example, when the negative electrolyte is provided to each stack in the first stack set 21 through the negative auxiliary liquid inlet pipeline 55, the first twelfth control valve 566 is controlled to be in an open state, and the first thirteenth control valve 567 is controlled to be in a closed state, so that the negative electrolyte after redox of each stack in the first stack set 21 can flow back to the negative main liquid return pipeline 56 through the negative outlet of the stack setting mechanism in the first stack set 21 and the first negative liquid return branch pipeline 561, and then flow back to the main liquid return port of the negative storage tank 42 through the negative main liquid return pipeline 56; when the negative electrolyte is provided to each stack in the first stack set 21 through the negative auxiliary liquid inlet pipeline 52, the first twelfth control valve 566 is controlled to be in a closed state, and the first thirteenth control valve 567 is controlled to be in an open state, so that the negative electrolyte after redox of each stack in the first stack set 21 can flow back to the negative main liquid return pipeline 56 through the negative outlet of the stack setting mechanism in the first stack set 21 and the first negative auxiliary liquid return pipeline 563, and then flow back to the main liquid return port of the negative storage tank 42 through the negative main liquid return pipeline 56, thereby realizing different liquid return modes of the flow battery multi-stack cascade test system and improving the flexibility and adjustability of the flow battery multi-stack cascade test system.

[0095] Optionally, as shown in Figure 4 The flow battery multi-stack cascade test system further includes a positive main drive pump 81 arranged in the positive main liquid inlet pipeline 51 between the main liquid outlet of the positive storage tank 41 and the positive liquid inlet branch pipeline; a positive auxiliary drive pump 82 arranged in the positive auxiliary liquid inlet pipeline 52 between the auxiliary liquid outlet of the positive storage tank 41 and the positive auxiliary liquid inlet port; a negative main drive pump 83 arranged in the negative main liquid inlet pipeline 54 between the main liquid outlet of the negative storage tank 42 and the negative liquid inlet branch pipeline; and a negative auxiliary drive pump 84 arranged in the negative auxiliary liquid inlet pipeline 55 between the auxiliary liquid outlet of the negative storage tank 42 and the negative auxiliary liquid inlet port.

[0096] The drive pump can be understood as a device that provides the power required to transport the electrolyte from the positive storage tank 41 or the negative storage tank 42 to each stack setting unit.

[0097] Specifically, the positive main driving pump 81 is configured to provide the pressure required for delivering the positive electrolyte from the main outlet of the positive electrolyte tank 41 to each of the stack setting units through the positive main inlet pipeline 51, the positive auxiliary driving pump 82 is configured to provide the pressure required for delivering the positive electrolyte from the auxiliary outlet of the positive electrolyte tank 41 to each of the stack setting units through the positive auxiliary inlet pipeline 52, the negative main driving pump 83 is configured to provide the pressure required for delivering the negative electrolyte from the main outlet of the negative electrolyte tank 42 to each of the stack setting units through the negative main inlet pipeline 54, and the negative auxiliary driving pump 84 is configured to provide the pressure required for delivering the negative electrolyte from the auxiliary outlet of the negative electrolyte tank 42 to each of the stack setting units through the negative auxiliary inlet pipeline 55. By providing the driving pumps, the electrolyte can be smoothly delivered to the stacks, which helps to ensure the normal operation of the flow battery multi-stack cascade test system and guarantees the stability and continuity of the performance of the flow battery multi-stack cascade test system.

[0098] Optionally, the flow battery multi-stack cascade test system further comprises a plurality of sensor modules, which are respectively arranged in the pipelines and are respectively configured to acquire at least one of the electrolyte temperature signal, the flow signal and the pressure signal in each of the pipelines; an electric signal acquisition unit, which is respectively connected with the stacks arranged at the stack setting mechanisms and is configured to acquire electric signals of the stacks; and a stack management module, which is connected with the stacks arranged at the stack setting mechanisms, the electric signal acquisition unit and the sensor modules. The stack management module is configured to control the charging and discharging states of the stacks according to the signals acquired by the sensor modules and the electric signals acquired by the electric signal acquisition unit.

[0099] Specifically, with continued reference to Figure 4The flow battery multi-stack cascade test system also includes a plurality of sensor modules arranged in the pipelines, for example, the sensor modules 9 arranged in the positive electrode main liquid inlet pipeline 51 and the first positive electrode liquid return branch pipeline 531 are taken as examples for description, the sensor modules 9 include various pressure sensors, various temperature sensors and various flow meters arranged in the positive electrode main liquid inlet pipeline 51 and the first positive electrode liquid return branch pipeline 531. The positive electrode main liquid inlet pipeline 51 is provided with a first pressure sensor 911, a second pressure sensor 912 and a third pressure sensor 913, wherein the positive electrode main drive pump 81 is located between the first pressure sensor 911 and the second pressure sensor 912, and the first pressure sensor 911 and the second pressure sensor 912 are respectively used to detect the pressure conditions of the positive electrode electrolyte before and after entering the positive electrode main drive pump 81. The third pressure sensor 913 is located between the second pressure sensor 912 and the position where the first positive electrode liquid inlet branch pipeline 511 communicates with the positive electrode main liquid inlet pipeline 51, and the third pressure sensor 913 is used to detect the pressure condition of the positive electrode electrolyte when entering the first positive electrode liquid inlet branch pipeline 511. The first positive electrode liquid return branch pipeline 531 is provided with a fourth pressure sensor 914, and the fourth pressure sensor 914 is used to detect the pressure condition of the positive electrode electrolyte after the redox reaction of each stack in the first stack setting group 21. The positive electrode main liquid inlet pipeline 51 is also provided with a first temperature sensor 921, and the first temperature sensor 921 is located between the second pressure sensor 912 and the position where the first positive electrode liquid inlet branch pipeline 511 communicates with the positive electrode main liquid inlet pipeline 51. The first temperature sensor 921 is used to detect the temperature condition of the positive electrode electrolyte when entering the first positive electrode liquid inlet branch pipeline 511. The first positive electrode liquid return branch pipeline 531 is also provided with a second temperature sensor 922, and the second temperature sensor 922 is used to detect the temperature condition of the positive electrode electrolyte after the redox reaction of each stack in the first stack setting group 21. The positive electrode main liquid inlet pipeline 51 is also provided with a first flow meter 931, and the first flow meter 931 is located between the positive electrode main drive pump 81 and the position where the first positive electrode liquid inlet branch pipeline 511 communicates with the positive electrode main liquid inlet pipeline 51. The first flow meter 931 is used to detect the flow of the positive electrode electrolyte when entering the first positive electrode liquid inlet branch pipeline 511. The first positive electrode pipeline liquid outlet 1A, the second positive electrode pipeline liquid outlet 2A and the third positive electrode pipeline liquid outlet 3A in the first positive electrode pipeline liquid outlet group 5111 in the first positive electrode liquid inlet branch pipeline 511 are respectively provided with a second flow meter 932, a third flow meter 933 and a fourth flow meter 934, and the second flow meter 932, the third flow meter 933 and the fourth flow meter 934 are respectively used to detect the flow of the positive electrode electrolyte when entering the first stack setting mechanism in the first stack setting group 21.By setting multiple sensor modules, the flow battery multi-stack cascade test system can monitor the pressure, temperature and flow of the electrolyte in real time, so as to timely adjust the delivery parameters of the electrolyte to ensure the stable operation of the flow battery multi-stack cascade test system, and at the same time, the flow of the electrolyte entering each stack can be judged to ensure that the flow of the electrolyte received by each stack is balanced, avoid performance differences caused by uneven flow, and improve the stability and consistency of the flow battery multi-stack cascade test system.

[0100] Correspondingly, Figure 5 is another structural schematic diagram of a flow battery multi-stack cascade test system provided by an embodiment of the present application, as Figure 5 indicated, the flow battery multi-stack cascade test system further includes an electric signal acquisition unit 101 and a stack management module 102, wherein the electric signal acquisition unit 101 is connected with the stacks arranged at the stack arrangement mechanisms, for acquiring the electric signals of each stack, including voltage, current and other parameters. By acquiring the electric signals of each stack, the flow battery multi-stack cascade test system can monitor the working state of each stack in real time, including the voltage and current changes during the charging and discharging process of the stack, to realize accurate management and optimization of the flow battery multi-stack cascade test system. The stack management module 102 is connected with the stacks arranged at the stack arrangement mechanisms, the electric signal acquisition unit 101, and each sensor module 9, for monitoring the working state of each stack in real time according to the signals obtained by the sensor module 9 and the electric signals acquired by the electric signal acquisition unit 101, to accurately adjust the charging and discharging state of each stack according to the working state of each stack, to ensure that the charging and discharging state of each stack is within a safe range, to prevent overcharging, overdischarging and other problems, to help improve the efficiency, stability and safety of the flow battery multi-stack cascade test system, and to ensure that each stack can stably and efficiently operate during the test process. It can be understood that the stack management module 102 and the stacks arranged at the stack arrangement mechanisms, the electric signal acquisition unit 101, and each sensor module 9 can be connected by electrical connection or communication connection, which is not limited by the present application.

[0101] Optionally, continuing to refer to Figure 5 , the flow battery multi-stack cascade test system further includes a charging and discharging module 103, which is electrically connected with the stacks arranged at the stack arrangement mechanisms, for acquiring the charging and discharging state of each stack, and determining the charging and discharging efficiency of each stack according to the charging and discharging state of each stack.

[0102] Specifically, the charge-discharge module 103 is electrically connected to each stack setting mechanism to obtain the charge-discharge state of each stack, and the charge-discharge efficiency of each stack, i.e. the ratio of energy input and output, is determined according to the charge-discharge state of each stack pair, so that the performance of the flow battery multi-stack cascade test system can be evaluated. It can be understood that the charge-discharge module 103 can monitor the charge-discharge efficiency of each stack under different liquid supply modes. By comparing the efficiency data under different liquid supply modes, the flow battery multi-stack cascade test system can determine which liquid supply mode can achieve the best stack charge-discharge efficiency, so as to optimize the operation mode of the flow battery multi-stack cascade test system and improve the efficiency, stability and reliability of the flow battery multi-stack cascade test system.

[0103] Optionally, the flow battery multi-stack cascade test system further comprises a filter 13, which is arranged in the positive main liquid inlet pipeline 51 between the main liquid outlet of the positive electrolyte tank 41 and each positive liquid inlet branch pipeline, in the positive auxiliary liquid inlet pipeline 52 between the auxiliary liquid outlet of the positive electrolyte tank 41 and each positive auxiliary liquid inlet, in the negative main liquid inlet pipeline 54 between the main liquid outlet of the negative electrolyte tank 42 and each negative liquid inlet branch pipeline, and in the negative auxiliary liquid inlet pipeline 55 between the auxiliary liquid outlet of the negative electrolyte tank 42 and each negative auxiliary liquid inlet.

[0104] Specifically, with continued reference to Figure 4 , the first filter 131 is arranged in the positive main liquid inlet pipeline 51 between the main liquid outlet of the positive electrolyte tank 41 and each positive liquid inlet branch pipeline, the second filter 132 is arranged in the positive auxiliary liquid inlet pipeline 52 between the auxiliary liquid outlet of the positive electrolyte tank 41 and each positive auxiliary liquid inlet, the third filter 133 is arranged in the negative main liquid inlet pipeline 54 between the main liquid outlet of the negative electrolyte tank 42 and each negative liquid inlet branch pipeline, and the fourth filter 134 is arranged in the negative auxiliary liquid inlet pipeline 55 between the auxiliary liquid outlet of the negative electrolyte tank 42 and each negative auxiliary liquid inlet. By arranging filters in each liquid inlet pipeline, impurities and particulate matter in the electrolyte can be filtered, which helps to maintain the purity of the electrolyte, prevents impurities from entering the stack, and avoids blockage of each liquid inlet pipeline, ensuring that the flow battery multi-stack cascade test system can operate stably and efficiently.

[0105] Optionally, with continued reference to Figure 3 , the flow battery multi-stack cascade test system further comprises a first exchange valve 01 arranged in a top exchange pipeline between the top electrolyte exchange port of the positive electrolyte tank 41 and the top electrolyte exchange port of the negative electrolyte tank 42, and a second exchange valve 02 arranged in a bottom exchange pipeline between the bottom electrolyte exchange port of the positive electrolyte tank 41 and the bottom electrolyte exchange port of the negative electrolyte tank 42.

[0106] It can be understood that, as the number of charge and discharge cycles of the flow battery multi-stack cascade test system increases, the electrolyte in the positive electrolyte tank and the negative electrolyte tank may migrate, causing an imbalance in the liquid level and affecting the capacity of the electrolyte. Therefore, a first exchange valve 01 is arranged in the top exchange pipeline between the top electrolyte exchange port of the positive electrolyte tank 41 and the top electrolyte exchange port of the negative electrolyte tank 42 to serve as a safety protection when the electrolyte level in the tank is too high, preventing the electrolyte from overflowing the tank and maintaining the stability of the liquid level in the tank. A second exchange valve 02 is arranged in the bottom exchange pipeline between the bottom electrolyte exchange port of the positive electrolyte tank 41 and the bottom electrolyte exchange port of the negative electrolyte tank 42 to mix part of the positive electrolyte and the negative electrolyte, ensuring the uniformity and consistency of the electrolyte, which helps to maintain the stability and performance of the electrolyte and avoid the electrolyte performance degradation caused by excessively high or low local electrolyte concentration. The arrangement of the first exchange valve and the second exchange valve helps to maintain the stability, safety and performance of the flow battery multi-stack cascade test system.

[0107] On the basis of the above-mentioned embodiments, optionally, the flow battery multi-stack cascade test system further comprises a container, the container is used to accommodate the entire flow battery multi-stack cascade test system, thereby realizing the integrated design of the flow battery multi-stack cascade test system and improving the efficiency, stability and reliability of the flow battery multi-stack cascade test system. The container can also be equipped with a walking wheel assembly composed of a group of rollers to enable the flow battery multi-stack cascade test system to be easily moved to the desired location, thereby improving the flexibility and convenience of the flow battery multi-stack cascade test system.

[0108] On the basis of the above-mentioned embodiments, optionally, the flow battery multi-stack cascade test system further comprises an environmental cabin, by adjusting the parameters inside the environmental cabin to simulate the operating conditions of the flow battery multi-stack cascade test system under different temperature, humidity and other environmental conditions, thereby verifying the stability and reliability of the flow battery multi-stack cascade test system under various environmental conditions, which helps to evaluate the performance of the flow battery multi-stack cascade test system under extreme conditions, find potential problems in advance and make improvements, thereby improving the stability and adaptability of the flow battery multi-stack cascade test system.

[0109] It should be understood that various forms of flow shown above can be used to reorder, add or delete steps. For example, each step described in the present application can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions disclosed in the present application can be achieved, which is not limited herein.

[0110] The above detailed description does not limit the scope of the application. Various modifications, combinations, sub-combinations and alternatives can be made to the detailed description. Any modification, equivalent replacement and improvement etc. made within the spirit and principle of the application shall be included in the scope of the application.

Claims

1. A multi-stacking test system for flow batteries, characterized in that, include: A fuel cell stack setup module includes multiple fuel cell stack setup units; each fuel cell stack setup unit includes multiple fuel cell stack setup groups; each fuel cell stack setup group includes at least one fuel cell stack setup mechanism; the fuel cell stack setup mechanism is used to set the fuel cell stack; the fuel cell stack setup mechanism includes a positive electrode liquid inlet, a negative electrode liquid inlet, a positive electrode liquid outlet, and a negative electrode liquid outlet; fuel cell stacks set in the same fuel cell stack setup unit are connected in series, and fuel cell stacks set in different fuel cell stack setup units are connected in parallel. The electrolyte circulation module includes a positive electrode storage tank, a negative electrode storage tank, a main positive electrode inlet pipeline, an auxiliary positive electrode inlet pipeline, multiple positive electrode inlet branch pipelines, a main positive electrode return pipeline, multiple positive electrode return branch pipelines, a main negative electrode inlet pipeline, an auxiliary negative electrode inlet pipeline, multiple negative electrode inlet branch pipelines, a main negative electrode return pipeline, and multiple negative electrode return branch pipelines; The main positive electrode inlet pipeline is connected to the main outlet of the positive electrode storage tank and each of the positive electrode inlet branch pipelines; each of the positive electrode inlet branch pipelines corresponds to each of the fuel cell stack units; each positive electrode inlet branch pipeline includes multiple positive electrode outlet groups corresponding to multiple fuel cell stack groups in the fuel cell stack unit; each positive electrode outlet group includes at least one positive electrode outlet corresponding to at least one fuel cell stack mechanism in the fuel cell stack group; the positive electrode outlet is connected to the positive electrode inlet of the fuel cell stack. The positive electrode liquid inlet branch pipeline is also provided with at least one positive electrode auxiliary liquid inlet and at least one first control valve; the positive electrode auxiliary liquid inlet and the first control valve are located in the positive electrode liquid inlet branch pipeline between two adjacent fuel cell stack groups in the same fuel cell stack unit; The positive electrode auxiliary liquid inlet pipeline is connected to the auxiliary liquid outlet of the positive electrode storage tank and each of the positive electrode auxiliary liquid inlets; a second control valve is provided in the positive electrode auxiliary liquid inlet pipeline between the auxiliary liquid outlet of the positive electrode storage tank and the positive electrode auxiliary liquid inlets. The main return liquid pipeline of the positive electrode is connected to the main return liquid port of the positive electrode storage tank and each of the positive electrode return liquid branch pipelines; each of the positive electrode return liquid branch pipelines corresponds one-to-one with each of the fuel cell stack mounting units; each positive electrode return liquid branch pipeline includes multiple positive electrode pipeline return liquid port groups corresponding one-to-one with multiple fuel cell stack mounting groups in the fuel cell stack mounting unit; each positive electrode pipeline return liquid port group includes at least one positive electrode pipeline return liquid port corresponding one-to-one with at least one fuel cell stack mounting mechanism in the fuel cell stack mounting group; the positive electrode pipeline return liquid port is connected to the positive electrode outlet of the fuel cell stack. The main negative electrode inlet pipeline is connected to the main outlet of the negative electrode storage tank and each of the negative electrode inlet branch pipelines; each negative electrode inlet branch pipeline corresponds to each of the fuel cell stack units; each negative electrode inlet branch pipeline includes multiple negative electrode pipeline outlet groups corresponding to multiple fuel cell stack groups in the fuel cell stack unit; each negative electrode pipeline outlet group includes at least one negative electrode pipeline outlet corresponding to at least one fuel cell stack mechanism in the fuel cell stack group; the negative electrode pipeline outlet is connected to the negative electrode inlet of the fuel cell stack. The negative electrode liquid inlet branch pipeline is also provided with at least one negative electrode auxiliary liquid inlet and at least one third control valve; the negative electrode auxiliary liquid inlet and the third control valve are located in the negative electrode liquid inlet branch pipeline between two adjacent fuel cell stack groups in the same fuel cell stack unit; The negative electrode auxiliary liquid inlet pipeline is connected to the auxiliary liquid outlet of the negative electrode storage tank and each of the negative electrode auxiliary liquid inlets; a fourth control valve is provided in the negative electrode auxiliary liquid inlet pipeline between the auxiliary liquid outlet of the negative electrode storage tank and the negative electrode auxiliary liquid inlets. The main return liquid pipeline of the negative electrode is connected to the main return liquid port of the negative electrode storage tank and each of the negative electrode return liquid branch pipelines; each of the negative electrode return liquid branch pipelines corresponds to each of the fuel cell stack setting units; the negative electrode return liquid branch pipeline includes multiple negative electrode pipeline return liquid port groups corresponding to multiple fuel cell stack setting groups in the fuel cell stack setting unit; each negative electrode pipeline return liquid port group includes at least one negative electrode pipeline return liquid port corresponding to at least one fuel cell stack setting mechanism in the fuel cell stack setting group; the negative electrode pipeline return liquid port is connected to the negative electrode outlet of the fuel cell stack.

2. The multi-stacking test system for flow batteries according to claim 1, characterized in that, Also includes: At least one fifth control valve is disposed in the positive electrode auxiliary inlet pipeline between two adjacent positive electrode auxiliary inlets; At least one sixth control valve is provided in the negative electrode auxiliary inlet pipeline between two adjacent negative electrode auxiliary inlets.

3. The multi-stacking test system for flow batteries according to claim 1, characterized in that, Also includes: The first temperature management module includes a heat exchange inlet and a heat exchange outlet; the heat exchange inlet is connected to the electrolyte heat exchange outlet of the positive electrode main return liquid pipeline through a heat exchange inlet pipe; the heat exchange outlet is connected to the electrolyte heat exchange inlet of the positive electrode main return liquid pipeline through a heat exchange outlet pipe; the first temperature management module is at least used to control the temperature of the electrolyte flowing back to the positive electrode storage tank through the positive electrode main return liquid pipeline.

4. The multi-stacking test system for flow batteries according to claim 3, characterized in that, Also includes: The seventh control valve is located in the positive electrode main return pipeline between the electrolyte heat exchange outlet of the positive electrode main return pipeline and the electrolyte heat exchange inlet of the positive electrode main return pipeline.

5. The multi-stacking test system for flow batteries according to claim 3, characterized in that, Also includes: The eighth control valve is located in the heat exchange inlet pipeline; And / or, The ninth control valve is located in the heat exchange outlet pipeline.

6. The multi-stacking test system for flow batteries according to claim 1, characterized in that, Also includes: The second temperature management module is located at least partially in the positive electrode storage tank and at least partially in the negative electrode storage tank; The second temperature management module is used to control the temperature of the electrolyte in the positive electrode storage tank and the negative electrode storage tank.

7. The multi-stacking test system for flow batteries according to claim 1, characterized in that, Also includes: Multiple positive electrode auxiliary return liquid pipelines are provided, each corresponding to one of the fuel cell stack units. Each positive electrode return liquid branch pipeline is also equipped with at least one positive electrode auxiliary return liquid port and at least one tenth control valve. The positive electrode auxiliary return liquid port and the tenth control valve are located in the positive electrode return liquid branch pipeline between two adjacent fuel cell stack groups within the same fuel cell stack unit. Each positive electrode auxiliary return liquid pipeline is connected to both the positive electrode auxiliary return liquid port and the positive electrode main return liquid pipeline. An eleventh control valve is provided in the positive electrode auxiliary return liquid pipeline between the positive electrode auxiliary return liquid port and the positive electrode main return liquid pipeline. Multiple negative electrode auxiliary return lines are provided, each corresponding to one of the fuel cell stack units. Each negative electrode return branch line is also provided with at least one negative electrode auxiliary return port and at least one twelfth control valve. The negative electrode auxiliary return port and the twelfth control valve are located in the negative electrode return branch line between two adjacent fuel cell stack groups in the same fuel cell stack unit. The negative electrode auxiliary return lines are connected to the negative electrode auxiliary return port and the negative electrode main return line, respectively. A thirteenth control valve is provided in the negative electrode auxiliary return line between the negative electrode auxiliary return port and the negative electrode main return line.

8. The multi-stacking test system for flow batteries according to claim 1, characterized in that, Also includes: A positive electrode main drive pump is installed in the positive electrode main inlet pipeline between the main outlet of the positive electrode storage tank and the positive electrode inlet branch pipeline; A positive electrode auxiliary drive pump is installed in the positive electrode auxiliary inlet pipeline between the auxiliary outlet of the positive electrode storage tank and the positive electrode auxiliary inlet; A negative electrode main drive pump is installed in the negative electrode main inlet pipeline between the main outlet of the negative electrode storage tank and the negative electrode inlet branch pipeline; A negative electrode auxiliary drive pump is installed in the negative electrode auxiliary inlet pipeline between the auxiliary outlet of the negative electrode storage tank and the negative electrode auxiliary inlet.

9. The multi-stacking test system for flow batteries according to claim 1, characterized in that, Also includes: Multiple sensor modules are respectively installed in each pipeline, and are used to acquire at least one of the electrolyte temperature signal, flow signal and pressure signal in each pipeline; An electrical signal acquisition unit is connected to each of the fuel cells disposed at each of the fuel cell stacking mechanisms, and is used to acquire electrical signals from each of the fuel cells respectively; The fuel cell stack management module is connected to the fuel cell stack, the electrical signal acquisition unit, and the sensor module respectively, which are respectively located at each of the fuel cell stack installation mechanisms; the fuel cell stack management module is used to control the charging and discharging state of each of the fuel cell stacks according to the signals acquired by the sensor modules and the electrical signals acquired by the electrical signal acquisition unit.

10. The multi-stacking test system for flow batteries according to claim 1, characterized in that, Also includes: The charging and discharging module is electrically connected to each of the fuel cell stacks installed at each of the fuel cell stack installation mechanisms, and is used to obtain the charging and discharging state of each of the fuel cell stacks and determine the charging and discharging efficiency of each fuel cell stack based on the charging and discharging state of each fuel cell stack.

11. The multi-stacking test system for flow batteries according to claim 1, characterized in that, Also includes: Filters are respectively installed in the main positive electrode inlet pipeline between the main outlet of the positive electrode storage tank and each of the positive electrode inlet branch pipelines, in the auxiliary positive electrode inlet pipeline between the auxiliary outlet of the positive electrode storage tank and each of the positive electrode auxiliary inlets, in the main negative electrode inlet pipeline between the main outlet of the negative electrode storage tank and each of the negative electrode inlet branch pipelines, and in the auxiliary negative electrode inlet pipeline between the auxiliary outlet of the negative electrode storage tank and each of the negative electrode auxiliary inlets.

12. The multi-stacking test system for flow batteries according to claim 1, characterized in that, Also includes: The first exchange valve is located in the top exchange pipeline between the top electrolyte exchange port of the positive electrode storage tank and the top electrolyte exchange port of the negative electrode storage tank; The second exchange valve is located in the bottom exchange pipeline between the bottom electrolyte exchange port of the positive electrode storage tank and the bottom electrolyte exchange port of the negative electrode storage tank.

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