A flow battery electrolyte recirculation piping system

Abstract

The application provides a circulating pipeline system of a flow battery electrolyte, and relates to the technical field of flow batteries, which comprises a main pipeline conveying unit: a positive electrode liquid inlet main pipeline, a positive electrode liquid outlet main pipeline, a negative electrode liquid inlet main pipeline and a negative electrode liquid outlet main pipeline are respectively connected with the liquid inlet and liquid outlet of a positive electrode liquid storage tank and the liquid inlet and liquid outlet of a negative electrode liquid storage tank in a one-to-one correspondence, and the other end is connected with a branch pipeline distribution unit; the branch pipeline distribution unit comprises a plurality of electrolyte conveying pipelines, and the two ends are respectively connected with the main pipeline conveying unit and the stack, wherein the number of electrolyte conveying pipelines of one end of the branch pipeline distribution unit connected with the stack is more than the number of electrolyte conveying pipelines of one end of the main pipeline conveying unit connected with the branch pipeline distribution unit. The electrolyte is branched in the conveying process, and the space decoupling design solves the electrolyte conveying and distribution problem of high-power density flow batteries.

Description

Technical Field

[0001] This utility model relates to the field of flow battery technology, specifically to a flow battery electrolyte circulation pipeline system. Background Technology

[0002] Flow batteries, with their advantages of energy and power decoupling, scale-adjustable design, high intrinsic safety of water-based electrolytes, and long cycle life, have become an ideal choice for large-scale, long-term energy storage. Furthermore, flow batteries offer advantages such as fast response, rapid charging / discharging state switching, and no phase change, enabling rapid power regulation in a short time. This makes them suitable for various applications, including frequency regulation, ensuring stable grid operation.

[0003] Currently, the electrolyte delivery system for high-power-density flow batteries primarily employs a centralized pumping system combined with multi-branch distribution. This traditional design has significant limitations: when power density needs to be increased and the electrolyte delivery volume needs to be increased several times over, the pipe diameter and pumping power must be significantly increased, placing enormous pressure on the space layout within the container and severely restricting the arrangement of critical components such as the fuel cell stack and energy storage tank. The complex piping network and valve system make routine maintenance and troubleshooting difficult; even localized blockages or leaks can force the entire system to shut down, seriously affecting operational reliability. Utility Model Content

[0004] This application provides a circulation pipeline system for electrolyte in a flow battery to at least solve the technical problems existing in the related art.

[0005] This application provides a circulation pipeline system for the electrolyte of a flow battery. The flow battery includes a positive electrode storage tank, a negative electrode storage tank, and multiple battery stacks. The circulation pipeline system includes a main pipeline delivery unit, comprising a positive electrode inlet main pipeline and a positive electrode outlet main pipeline connected to the positive electrode storage tank, and a negative electrode inlet main pipeline and a negative electrode outlet main pipeline connected to the negative electrode storage tank. The positive electrode inlet main pipeline, positive electrode outlet main pipeline, negative electrode inlet main pipeline, and negative electrode outlet main pipeline are respectively connected to the inlet and outlet of the positive electrode storage tank and the inlet and outlet of the negative electrode storage tank. The other end is connected to the branch pipeline distribution unit; the branch pipeline distribution unit includes multiple electrolyte delivery pipelines, with both ends connected to the main pipeline delivery unit and the fuel cell stack, respectively. The number of electrolyte delivery pipelines at the end of the branch pipeline distribution unit connected to the fuel cell stack is greater than the number of electrolyte delivery pipelines at the end of the branch pipeline distribution unit connected to the main pipeline delivery unit. Each of the multiple fuel cell stacks includes multiple inlets and outlets, and the number of electrolyte delivery pipelines at the end of the branch pipeline distribution unit connected to the fuel cell stack corresponds one-to-one with the number of inlets and outlets.

[0006] As an optional implementation, multiple level allocation modules are sequentially connected between the main pipeline delivery unit and the fuel cell stack in ascending order of level.

[0007] As an optional implementation, each of the level allocation modules includes multiple allocation sub-modules; one end of the allocation sub-module connected to the main pipeline conveying unit or a lower-level level allocation module is designated as the upper-level pipeline, and the other end of the allocation sub-module connected to the fuel cell stack or a higher-level level allocation module is designated as the lower-level pipeline. Each allocation sub-module includes: one upper-level pipeline, multiple lower-level pipelines, and a distribution box.

[0008] As an optional implementation, the number of allocation submodules at each level is equal to the number of lower-level pipelines of the allocation module at the level above it.

[0009] As an optional implementation, the upper-level pipeline passes through the distribution box, with part of it outside the distribution box and connected to the lower-level pipeline of the main pipeline delivery unit or the level distribution module of the previous level, and part of it inside the distribution box, so that the electrolyte flows into the distribution box; the lower-level pipeline passes through the distribution box, with part of it inside the distribution box and part of it outside the distribution box, and connected to the upper-level pipeline of the fuel cell stack or the level distribution module of the next level, so that the electrolyte flows into the upper-level pipeline of the fuel cell stack or the level distribution module of the next level.

[0010] As an optional implementation, the upper-level pipeline and the lower-level pipeline are fixed to the two sides of the distribution box, and the portions of the upper-level pipeline and the lower-level pipeline inside the distribution box are evenly provided with flow holes.

[0011] As an optional implementation, the positive electrode liquid outlet main pipeline and the negative electrode liquid outlet main pipeline are equipped with a magnetic pump, a filter, multiple control valves and multiple temperature sensors; the positive electrode liquid outlet main pipeline is also equipped with a heat exchanger; the positive electrode liquid inlet main pipeline and the negative electrode liquid inlet main pipeline are also equipped with multiple control valves and multiple temperature sensors.

[0012] As an optional implementation, the branch pipeline distribution unit is provided with a pipe bank near the electrolyte delivery pipeline of the fuel cell stack, and the electrolyte delivery pipeline passes through the pipe bank and is connected to the fuel cell stack.

[0013] As an optional implementation, it further includes: a mixing pipeline connecting the positive electrode inlet main pipeline and the negative electrode outlet main pipeline; a positive electrode electrolyte circulation pipeline connecting the positive electrode inlet main pipeline and the positive electrode outlet main pipeline; and a negative electrode electrolyte circulation pipeline connecting the negative electrode inlet main pipeline and the negative electrode outlet main pipeline.

[0014] As an optional implementation, it also includes: an OCV sensor.

[0015] The beneficial effects of this utility model are as follows: The flow battery includes a positive electrode storage tank, a negative electrode storage tank, and multiple battery stacks; the circulation pipeline system includes a main pipeline conveying unit, comprising a positive electrode inlet main pipeline and a positive electrode outlet main pipeline connected to the positive electrode storage tank, and a negative electrode inlet main pipeline and a negative electrode outlet main pipeline connected to the negative electrode storage tank; the positive electrode inlet main pipeline, the positive electrode outlet main pipeline, the negative electrode inlet main pipeline, and the negative electrode outlet main pipeline are respectively connected to the inlet and outlet of the positive electrode storage tank and the inlet and outlet of the negative electrode storage tank, respectively, and the other end... It is connected to a branch pipeline distribution unit; the branch pipeline distribution unit includes multiple electrolyte delivery pipelines, each end of which is connected to the main pipeline delivery unit and the fuel cell stack, respectively. The number of electrolyte delivery pipelines at the end of the branch pipeline distribution unit connected to the fuel cell stack is greater than the number of electrolyte delivery pipelines at the end of the branch pipeline distribution unit connected to the main pipeline delivery unit. Each of the multiple fuel cell stacks includes multiple inlets and outlets, and the number of electrolyte delivery pipelines at the end of the branch pipeline distribution unit connected to the fuel cell stack corresponds one-to-one with the number of inlets and outlets. By setting up branch pipeline distribution units, and ensuring that the number of electrolyte delivery pipelines at the end of the branch pipeline distribution unit connected to the fuel cell stack is greater than the number of electrolyte delivery pipelines at the end of the branch pipeline distribution unit connected to the main pipeline delivery unit, the electrolyte is diverted during delivery. Through spatial decoupling design, this approach addresses the electrolyte delivery and distribution issues in high-power-density flow batteries, including but not limited to vanadium redox flow batteries, zinc-bromine flow batteries, iron-chromium flow batteries, and iron-vanadium redox flow batteries. Optimizing the container layout solves existing technical problems in flow battery electrolyte delivery, such as limited internal space, inflexible flow regulation, and maintenance difficulties caused by high-flow-rate delivery. This innovative design achieves efficient electrolyte delivery and precise distribution, improving system integration and maintainability, and providing technical support for the containerized application of high-power-density flow batteries. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a schematic diagram of the circulation pipeline system for a flow battery electrolyte according to an embodiment of this application.

[0019] Figure 2 This is a schematic diagram of the structure of an allocation submodule provided according to an embodiment of this application.

[0020] Figure 3 This is a schematic diagram of the circulation pipeline system for another flow battery electrolyte provided according to an embodiment of this application.

[0021] Figure Labels

[0022] 1 capacity tank, 11 positive electrode storage tank, 12 negative electrode storage tank;

[0023] 2 Main pipeline delivery unit, 21 Positive electrode liquid inlet main pipeline, 22 Positive electrode liquid outlet main pipeline, 23 Negative electrode liquid inlet main pipeline, 24 Negative electrode liquid outlet main pipeline, 25 Magnetic pump, 26 Filter, 27 Control valve, 28 Temperature sensor, 29 Heat exchanger.

[0024] 3 branch pipe distribution units, 31 level distribution modules, 311 distribution sub-modules, 312 distribution boxes, 313 upper-level pipes, 314 lower-level pipes, 315 flow holes, 32 pipe rows;

[0025] 4 fuel cell stacks;

[0026] 5. Mixing pipeline;

[0027] 6. Positive electrolyte circulation pipeline;

[0028] 7. Negative electrode electrolyte circulation pipeline;

[0029] 8OCV sensor. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0031] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] like Figure 1 As shown in the figure, this application embodiment provides a circulation pipeline system for electrolyte in a flow battery. The flow battery includes: a positive electrode storage tank 11, a negative electrode storage tank 12, and multiple battery stacks 4. The circulation pipeline system includes: a main pipeline conveying unit 2, including a positive electrode inlet main pipeline 21 and a positive electrode outlet main pipeline 22 connected to the positive electrode storage tank 11, and a negative electrode inlet main pipeline 23 and a negative electrode outlet main pipeline 24 connected to the negative electrode storage tank 12. The positive electrode inlet main pipeline 21, the positive electrode outlet main pipeline 22, the negative electrode inlet main pipeline 23, and the negative electrode outlet main pipeline 24 are respectively connected to the inlet and outlet of the positive electrode storage tank 11 and the inlet and outlet of the negative electrode storage tank 12, and the other end is connected to a branch pipeline distribution unit 3.

[0033] Branch pipeline distribution unit 3: includes multiple electrolyte delivery pipelines, both ends of which are connected to the main pipeline delivery unit 2 and the fuel cell stack 4 respectively. The number of electrolyte delivery pipelines at the end of the branch pipeline distribution unit 3 connected to the fuel cell stack 4 is greater than the number of electrolyte delivery pipelines at the end of the branch pipeline distribution unit 3 connected to the main pipeline delivery unit 2.

[0034] The branch pipeline distribution unit 3 includes multiple level distribution modules 31, and each of the multiple fuel cell stacks 4 includes multiple liquid inlets and liquid outlets. The number of electrolyte delivery pipelines at the end of the branch pipeline distribution unit 3 connected to the fuel cell stack 4 corresponds one-to-one with the multiple liquid inlets and liquid outlets.

[0035] Specifically, by setting up a branch pipeline distribution unit 3, and ensuring that the number of electrolyte delivery pipelines at the end of the branch pipeline distribution unit 3 connected to the fuel cell stack 4 is greater than the number of electrolyte delivery pipelines at the end of the branch pipeline distribution unit 3 connected to the main pipeline delivery unit 2, the electrolyte is diverted during delivery. Through spatial decoupling design, this approach addresses the electrolyte delivery and distribution issues of high-power-density flow batteries, including but not limited to vanadium redox flow batteries, zinc-bromine flow batteries, iron-chromium flow batteries, and iron-vanadium redox flow batteries. It optimizes the internal layout of the container and solves the technical problems existing in current flow battery electrolyte delivery, such as limited internal space layout, inflexible flow regulation, and difficult maintenance due to high-flow-rate delivery. This innovative design achieves efficient electrolyte delivery and precise distribution, improves system integration and maintainability, and provides technical support for the containerized application of high-power-density flow batteries.

[0036] In addition, such as Figure 1 As shown, the flow battery may include a capacity tank 1, which contains a positive electrode storage tank 11 and a negative electrode storage tank 12, and may also include a power tank, which contains multiple fuel cell stacks 4. A branch pipeline distribution unit 3 is provided between the capacity tank 1 and the power tank, with one end connected to the capacity tank 1 and the other end connected to the power tank. It can decouple the main pipeline of the main pipeline delivery unit 2 into multiple branch pipelines connected to the fuel cell stacks 4. At the same time, the fuel cell stacks 4 may also include multiple liquid inlets and outlets, which are connected one-to-one with the multiple branch pipelines.

[0037] It should be noted that this application does not limit the specific number of pipelines included in the main pipeline delivery unit 2, that is, it does not limit the specific number of positive electrode liquid inlet main pipeline 21, positive electrode liquid outlet main pipeline 22, negative electrode liquid inlet main pipeline 23 and negative electrode liquid outlet main pipeline 24. At the same time, it does not limit the number of branch pipelines included in the branch pipeline distribution unit 3. However, the number of pipelines at the end of the branch pipeline distribution unit 3 that is connected to the main pipeline delivery unit 2 must be the same as the number of main pipelines included in the main pipeline delivery unit 2, and the number of pipelines at the end that is connected to the fuel cell stack 4 must be the same as the total number of liquid inlets and liquid outlets of the fuel cell stack 4.

[0038] As an optional implementation, a plurality of the level allocation modules 31 are sequentially connected between the main pipeline conveying unit 2 and the fuel cell stack 4 in order of increasing level.

[0039] As an optional implementation, each of the level allocation modules 31 includes multiple allocation sub-modules 311; one end of the allocation sub-module 311 connected to the main pipeline conveying unit 2 or a lower-level level allocation module 31 is designated as an upper-level pipeline 313, and the other end of the allocation sub-module 311 connected to the fuel cell stack 4 or a higher-level level allocation module 31 is designated as a lower-level pipeline 314. Each allocation sub-module 311 includes: one upper-level pipeline 313, multiple lower-level pipelines 314, and a distribution box 312.

[0040] As an optional implementation, the number of allocation submodules 311 at each level is equal to the number of lower-level pipelines 314 of the level allocation module 31 at the previous level.

[0041] Specifically, such as Figure 1 As shown, the branch pipeline distribution unit 3 includes multiple level distribution modules 31, and the multiple level distribution modules 31 are connected sequentially in ascending order of level. For example, if it includes two level distribution modules 31, the upper pipeline 313 of the first level distribution module 31 can be set to be directly connected to the main pipeline delivery unit 2. The lower pipeline 314 of the first level distribution module 31 is connected to the upper pipeline 313 of the second level distribution module 31, and the lower pipeline 314 of the second level distribution module 31 is connected to the fuel cell stack 4. For example, if the main pipeline delivery unit 2 includes... A positive electrode liquid outlet main line 22, a positive electrode liquid inlet main line 21, a negative electrode liquid inlet main line 23, and a negative electrode liquid outlet main line 24 are provided. Then, there are four first distribution sub-modules 311. Each first distribution sub-module 311 can include two lower-level pipelines 314. Then, the second-level distribution module 31 includes eight second distribution sub-modules 311. Each second distribution sub-module 311 can also include two lower-level pipelines 314. Finally, the fuel cell stack 4 needs to be provided with four positive electrode electrolyte inlets, four positive electrode electrolyte outlets, four negative electrode electrolyte inlets, and four negative electrode electrolyte outlets.

[0042] It should be noted that this application does not limit the specific number of the level allocation module 31 and the allocation sub-module 311; the above is merely an embodiment.

[0043] As an optional implementation, the upper-level pipeline 313 passes through the distribution box 312, with part of it outside the distribution box 312 and connected to the lower-level pipeline 314 of the main pipeline delivery unit 2 or the next-level distribution module 31, and part of it inside the distribution box 312, so that the electrolyte flows into the distribution box 312; the lower-level pipeline 314 passes through the distribution box 312, with part of it inside the distribution box 312 and part of it outside the distribution box 312, and connected to the upper-level pipeline 313 of the fuel cell stack 4 or the next-level distribution module 31, so that the electrolyte flows into the upper-level pipeline 313 of the fuel cell stack 4 or the next-level distribution module 31.

[0044] Specifically, such as Figure 2 As shown, the upper-level pipeline 313 passes through the distribution box 312, with part of it outside the distribution box 312 and connected to the lower-level pipeline 314 of the main pipeline delivery unit 2 or the level distribution module 31 of the next higher level, and part of it inside the distribution box 312, so that the electrolyte flows into the distribution box 312; the lower-level pipeline 314 passes through the distribution box 312, with part of it inside the distribution box 312 and part of it outside the distribution box 312, and connected to the upper-level pipeline 313 of the fuel cell stack 4 or the level distribution module 31 of the next lower level, so that the electrolyte flows into the upper-level pipeline 313 of the fuel cell stack 4 or the level distribution module 31 of the next lower level.

[0045] When electrolyte is discharged from the storage tank, the magnetic pump 25 transports the electrolyte from the positive electrode storage tank 11 or the negative electrode storage tank 12 through the positive electrode outlet main line 22 or the negative electrode outlet main line 24 to the filter 26 and the heat exchanger 29, and then to the distribution sub-module 311 of the first-level distribution module 31. Each distribution sub-module 311 evenly divides the electrolyte into N parts and sends them through the lower-level pipeline 314 of the first-level distribution module 311 to the upper-level pipeline 313 of the distribution sub-module 311 of the second-level distribution module 31. The distribution sub-module 311 of the second-level distribution module 31 further evenly divides the electrolyte into M parts and accurately delivers them to the fuel cell stack 4 in the power box. The second-level distribution module 31 can use corrugated hoses to deliver the electrolyte to the fuel cell stack 4, and the corrugated hoses are connected to the liquid inlet of each module of the fuel cell stack 4 through the pipe row 32.

[0046] When the electrolyte is fed into the storage tank, the direction of electrolyte flow is opposite to that when the electrolyte is discharged from the storage tank. The electrolyte flows out of the stack 4, passes through the second level distribution module 31 and the first level distribution module 31 in sequence, and finally reaches the negative electrode storage tank 12 and the positive electrode storage tank 11.

[0047] As an optional implementation, the upper-level pipeline 313 and the lower-level pipeline 314 are fixed to the two sides of the distribution box 312, and the portions of the upper-level pipeline 313 and the lower-level pipeline 314 inside the distribution box 312 are evenly provided with flow holes 315.

[0048] As an optional implementation, the positive electrode liquid outlet main line 22 and the negative electrode liquid outlet main line 24 are equipped with a magnetic pump 25, a filter 26, multiple control valves 27 and multiple temperature sensors 28; the positive electrode liquid outlet main line 22 is also equipped with a heat exchanger 29; the positive electrode liquid inlet main line 21 and the negative electrode liquid inlet main line 23 are also equipped with multiple control valves 27 and multiple temperature sensors 28.

[0049] In addition, the positive electrode liquid outlet main line 22 and the negative electrode liquid outlet main line 24 are equipped with a magnetic pump 25, a filter 26, multiple control valves 27 and multiple temperature sensors 28, and the positive electrode liquid inlet main line 21 and the negative electrode liquid inlet main line 23 are also equipped with multiple control valves 27 and multiple temperature sensors 28, which can ensure that the electrolyte supply, pressure and temperature of each stack 4 are consistent, thereby avoiding the problem of uneven flow in the traditional centralized distribution of electrolyte.

[0050] As an optional implementation, the branch pipeline distribution unit 3 is provided with a pipe row 32 near the electrolyte delivery pipeline of the fuel cell stack 4, and the electrolyte delivery pipeline passes through the pipe row 32 and is connected to the fuel cell stack 4.

[0051] It can improve the orderly arrangement of electrolyte delivery pipelines.

[0052] like Figure 3 As shown, as an optional implementation, it further includes: a mixing pipeline 5, connecting the positive electrode inlet main pipeline 21 and the negative electrode outlet main pipeline 24; a positive electrode electrolyte circulation pipeline 6, connecting the positive electrode inlet main pipeline 21 and the positive electrode outlet main pipeline 22; and a negative electrode electrolyte circulation pipeline 7, connecting the negative electrode inlet main pipeline 23 and the negative electrode outlet main pipeline 24.

[0053] The mixing line 5 allows the liquids in the negative electrode reservoir 12 and the positive electrode reservoir 11 to be mixed. During the charging and discharging process of a flow battery, side reactions, transmembrane migration, and gas evolution occur, leading to degradation phenomena. This results in excessive deviations in the volume and valence state of the positive and negative electrode electrolytes, reducing the actual usable capacity (in Ah or Wh). Mixing the positive and negative electrode electrolytes yields an electrolyte with an average valence state. Further activation with the electrolyte results in a balanced positive and negative electrode electrolyte, restoring the usable capacity.

[0054] The positive electrolyte circulation pipeline 6 and the negative electrolyte circulation pipeline 7 provide circulation pipelines for the electrolyte without passing through the branch pipeline distribution unit 3 and the stack 4.

[0055] like Figure 3 As shown, as an optional implementation, it also includes: an OCV sensor 8.

[0056] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0057] If the integrated units in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in the aforementioned computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause one or more electronic devices (which may be personal computers, servers, or network devices, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0058] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0059] In the several embodiments provided in this application, it should be understood that the disclosed client can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection between units or modules, and may be electrical or other forms.

[0060] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the solution provided in this embodiment, depending on actual needs.

[0061] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0062] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0063] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A circulation pipeline system for electrolyte in a flow battery, characterized in that, The flow battery includes: a positive electrode reservoir, a negative electrode reservoir, and multiple fuel cell stacks; the circulation piping system includes: Main pipeline delivery unit: includes a positive electrode inlet main pipeline and a positive electrode outlet main pipeline connected to the positive electrode storage tank, and a negative electrode inlet main pipeline and a negative electrode outlet main pipeline connected to the negative electrode storage tank; the positive electrode inlet main pipeline, the positive electrode outlet main pipeline, the negative electrode inlet main pipeline and the negative electrode outlet main pipeline are respectively connected to the inlet and outlet of the positive electrode storage tank and the inlet and outlet of the negative electrode storage tank, and the other end is connected to the branch pipeline distribution unit; Branch pipeline distribution unit: includes multiple electrolyte delivery pipelines, with both ends connected to the main pipeline delivery unit and the fuel cell stack, respectively. The number of electrolyte delivery pipelines at the end of the branch pipeline distribution unit connected to the fuel cell stack is greater than the number of electrolyte delivery pipelines at the end of the branch pipeline distribution unit connected to the main pipeline delivery unit. Each of the multiple battery stacks includes multiple liquid inlets and liquid outlets, and the number of electrolyte delivery pipelines at the end of the branch pipeline distribution unit connected to the battery stack corresponds one-to-one with the multiple liquid inlets and liquid outlets.

2. The circulation pipeline system for the electrolyte in a flow battery as described in claim 1, characterized in that, The branch pipeline distribution unit includes multiple level distribution modules, which are sequentially connected between the main pipeline delivery unit and the fuel cell stack in order of increasing level.

3. The circulation pipeline system for the electrolyte in a flow battery as described in claim 2, characterized in that, Each of the level allocation modules includes multiple allocation sub-modules; The distribution submodule is configured such that the end connected to the main pipeline conveying unit or a lower-level distribution module is the upper-level pipeline, and the end connected to the fuel cell stack or a higher-level distribution module is the lower-level pipeline. Each distribution submodule includes: one upper-level pipeline, multiple lower-level pipelines, and a distribution box.

4. The circulation pipeline system for the electrolyte in a flow battery as described in claim 3, characterized in that, The number of allocation submodules at each level is equal to the number of subordinate pipelines of the allocation module at the level above it.

5. The circulation pipeline system for the electrolyte in a flow battery as described in claim 4, characterized in that, The upper-level pipeline passes through the distribution box, with part of it outside the distribution box and connected to the lower-level pipeline of the main pipeline conveying unit or the level distribution module of the previous level, and part of it inside the distribution box so that the electrolyte flows into the distribution box; The lower-level pipeline passes through the distribution box, with part inside the distribution box and part outside the distribution box, and is connected to the upper-level pipeline of the fuel cell stack or the next-level distribution module, so that the electrolyte flows into the upper-level pipeline of the fuel cell stack or the next-level distribution module.

6. The circulation pipeline system for the electrolyte in a flow battery as described in claim 5, characterized in that, The upper-level pipeline and the lower-level pipeline are fixed to the two sides of the distribution box, and the portions of the upper-level pipeline and the lower-level pipeline inside the distribution box are evenly provided with flow holes.

7. The circulation pipeline system for the electrolyte in a flow battery as described in claim 4, characterized in that, The positive electrode liquid outlet main pipeline and the negative electrode liquid outlet main pipeline are equipped with a magnetic pump, a filter, multiple control valves and multiple temperature sensors; the positive electrode liquid outlet main pipeline is also equipped with a heat exchanger; the positive electrode liquid inlet main pipeline and the negative electrode liquid inlet main pipeline are also equipped with multiple control valves and multiple temperature sensors.

8. The circulation pipeline system for the electrolyte in a flow battery as described in claim 1, characterized in that, The branch pipeline distribution unit is provided with a pipe bank near the electrolyte delivery pipeline of the fuel cell stack, and the electrolyte delivery pipeline passes through the pipe bank and is connected to the fuel cell stack.

9. The circulation pipeline system for the electrolyte in a flow battery as described in claim 1, characterized in that, Also includes: The mixing pipeline connects the positive electrode inlet main pipeline and the negative electrode outlet main pipeline; A positive electrode electrolyte circulation pipeline connects the positive electrode inlet main pipeline and the positive electrode outlet main pipeline; The negative electrode electrolyte circulation pipeline connects the negative electrode inlet main pipeline and the negative electrode outlet main pipeline.

10. The circulation pipeline system for the electrolyte in a flow battery as described in claim 1, characterized in that, Also includes: OCV sensor.

Images