Electric pile of flow battery

Abstract

The invention belongs to the technical field of flow battery energy storage, and particularly relates to an electric pile of a flow battery, which comprises a plurality of battery units, power taking pieces arranged on two sides of the battery units, a first conductive piece for connecting the battery units in parallel, a second conductive piece for connecting the battery units connected in parallel in series, and an insulating piece, at least two battery units are connected in parallel through the first conductive part to form a battery module, the insulating part is arranged between two adjacent battery modules, and the plurality of battery modules are connected in series through the second conductive part. According to the galvanic pile of the redox flow battery, the battery units are connected in parallel to form the battery modules, and then the battery modules are connected in series, so that the output current is improved, the bypass current is eliminated to reduce the loss and prolong the service life, and the total voltage superposition is realized, thereby improving the overall power of the galvanic pile and the system suitability.

Description

Technical Field

[0001] This invention relates to the field of flow battery energy storage technology, and more specifically to a flow battery stack. Background Technology

[0002] Flow batteries, as a novel battery technology, offer advantages such as high efficiency, safety, reliability, and long cycle life. They effectively compensate for the inherent instability of renewable energy sources like solar and wind power, enabling stable and continuous power supply. Flow batteries store and release electrical energy through the redox reaction of active materials in the electrolyte, offering advantages such as long cycle life and high safety, making them suitable for large-scale energy storage applications.

[0003] However, most existing flow battery stacks consist of multiple cells connected in series. Due to the conductivity of the electrolyte, a bypass current is formed between adjacent cells. This not only reduces the stack's conversion efficiency but also accelerates the irreversible wear of key materials such as electrodes and separators, shortening the system's lifespan. In addition, existing stacks typically increase the reaction area of ​​individual cells to improve the single-cell current in order to increase the power of the stack. However, if the reaction area is too large, it will lead to uneven distribution of electrolyte flow, causing local mass transfer problems and affecting the stack's performance. Furthermore, due to limitations in processing precision, the reaction area of ​​a single cell cannot be increased indefinitely, thus limiting the improvement of the overall output current and power of the stack.

[0004] Therefore, it is necessary to provide new flow battery stacks. Summary of the Invention

[0005] In view of this, the present invention provides a flow battery stack that improves the output current, eliminates bypass current to reduce losses and extend lifespan by connecting battery cells in parallel to form battery modules, and then connects the battery modules in series. It also achieves total voltage superposition, thereby improving the overall power of the stack and the system adaptability.

[0006] The technical solution adopted by the present invention to solve its technical problem is: to provide a flow battery stack, including: multiple battery cells, power taking components disposed on both sides of the battery cells, a first conductive component connecting the battery cells in parallel, a second conductive component connecting the parallel battery cells in series, and an insulating component, wherein at least two battery cells are connected in parallel through the first conductive component to form a battery module, the insulating component is disposed between two adjacent battery modules, and multiple battery modules are connected in series through the second conductive component.

[0007] Furthermore, the battery cell includes a proton exchange membrane, an anode carbon felt and a cathode carbon felt symmetrically arranged on both sides of the proton exchange membrane, an anode electrode frame, a cathode electrode frame, an anode bipolar plate, and a cathode bipolar plate; wherein, the proton exchange membrane is located between the anode carbon felt and the cathode carbon felt, the anode bipolar plate is located on the outermost side of the anode of the battery cell and is adjacent to the anode electrode frame, and the cathode bipolar plate is located on the outermost side of the cathode of the battery cell and is adjacent to the cathode electrode frame.

[0008] Furthermore, each of the battery modules includes two symmetrically arranged battery cells, three power-collecting components, and a first conductive component.

[0009] Furthermore, the anode sides of the two battery cells are arranged opposite each other, and the anode sides of the two battery cells share a common power-taking component. The other two power-taking components are respectively arranged on the cathode sides outside the two battery cells. The first conductive component connects the two power-taking components located on the outside, so that the two battery cells form a parallel circuit.

[0010] Furthermore, the power taking component is provided with tabs, the tabs of the two power taking components located on the outside are located on the same side, and the tabs of the power taking component between the two battery cells are located on different sides.

[0011] Furthermore, when the second conductive element is connected to an adjacent battery module, one end of one of the second conductive elements is connected to the tab of the anode-side power-taking component of the preceding battery module, and the other end is connected to the tab of the cathode-side power-taking component of the following battery module; one end of the other second conductive element is connected to the tab of the cathode-side power-taking component of the preceding battery module, and the other end is connected to the tab of the anode-side power-taking component of the following battery module, forming a series circuit.

[0012] Furthermore, each of the battery modules includes three battery cells, four power-collecting components, and two first conductive components.

[0013] Furthermore, the anode side of the first battery cell is disposed opposite to the anode side of the second battery cell, and the cathode side of the second battery cell is disposed opposite to the cathode side of the third battery cell.

[0014] Furthermore, the anode side of the first battery cell and the anode side of the second battery cell share a common power-taking device, the cathode side of the second battery cell and the cathode side of the third battery cell share a common power-taking device, a power-taking device is provided on the cathode side of the first battery cell located on the outer side, and a power-taking device is provided on the anode side of the third battery cell located on the outer side.

[0015] Furthermore, one end of one of the first conductive elements is connected to a power-taking component located between the anode side of the first battery cell and the anode side of the second battery cell, and the other end is connected to a power-taking component located on the anode side of the third battery cell on the outside; one end of the other first conductive element is connected to a power-taking component located between the cathode side of the second battery cell and the cathode side of the third battery cell, and the other end is connected to a power-taking component located on the cathode side of the first battery cell on the outside. The first conductive elements connect the outer current paths of the three battery cells, so that the three battery cells form a parallel circuit.

[0016] The beneficial effects of this invention are as follows: The flow battery stack of this invention includes multiple battery cells, power extraction components disposed on both sides of the battery cells, a first conductive component connecting the battery cells in parallel, a second conductive component connecting the parallel battery cells in series, and an insulating component. At least two battery cells are connected in parallel through the first conductive component to form a battery module. The insulating component is disposed between two adjacent battery modules. Multiple battery modules are connected in series through the second conductive component. The flow battery stack of this invention effectively increases the stack output current by connecting at least two battery cells in parallel through the first conductive component to form a battery module. The parallel connection of battery cells makes the potential difference between adjacent cells zero, eliminating bypass current, reducing energy loss and component loss, and extending the stack life. The series connection of multiple battery modules achieves total voltage superposition, improving the overall power of the stack and system adaptability. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of the fuel cell stack according to Embodiment 1 of the present invention; Figure 2 This is an exploded view of the fuel cell stack according to Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the battery module according to Embodiment 1 of the present invention; Figure 4 This is an exploded view of the battery module according to Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the battery cell structure according to Embodiment 1 of the present invention; Figure 6 This is an exploded view of the battery cell according to Embodiment 1 of the present invention.

[0019] The component names and their numbers in the diagram are as follows: The flow battery stack is 100. Battery cell 1, proton exchange membrane 11, anode carbon felt 12, cathode carbon felt 13, anode electrode frame 14, cathode electrode frame 15, anode bipolar plate 16, cathode bipolar plate 17; Power-generating component 2, electrode tab 21; First conductive component 3; second conductive component 4; battery module 5; insulating component 6. Detailed Implementation

[0020] To make the technical problems, solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] It should be noted that when a component is referred to as "connected to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0024] Throughout this specification, reference to "an embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, a particular feature, structure, or characteristic may be combined in any suitable manner.

[0025] Example 1 like Figure 1 , Figure 2As shown, this embodiment provides a flow battery stack 100, including multiple battery cells 1, power-collecting components 2 disposed on both sides of the battery cells 1, a first conductive component 3 connecting the battery cells 1 in parallel, a second conductive component 4 connecting the parallel-connected battery cells 1 in series, and an insulating component 6. At least two battery cells 1 are connected in parallel via the first conductive component 3 to form a battery module 5. The insulating component 5 is disposed between two adjacent battery modules 5, and multiple battery modules 5 are connected in series via the second conductive component 4. The battery cells 1 generate electrical energy through the redox reaction of the flow battery electrolyte; the power-collecting components 2 collect the current generated by the battery cells 1; the first conductive component 3 connects the battery cells 1 in parallel; and the second conductive component 4 connects the battery modules 5 in series.

[0026] In some of these embodiments, such as Figure 5 , Figure 6As shown, the battery cell 1 includes a proton exchange membrane 11, an anode carbon felt 12 and a cathode carbon felt 13 symmetrically arranged on both sides of the proton exchange membrane 11, an anode electrode frame 14, a cathode electrode frame 15, an anode bipolar plate 16, and a cathode bipolar plate 17. The proton exchange membrane 11 is a thin film that allows only protons to pass through, ensuring that protons can migrate from one electrode to another during charging / discharging of the flow battery, maintaining charge balance. The proton exchange membrane 11 is located between the anode carbon felt 12 and the cathode carbon felt 13, separating the electrolytes at the anode and cathode to prevent mixing and contamination, ensuring the continuous operation of the battery reaction. The anode carbon felt 12 is located inside the anode electrode frame 14 and is in close contact with the anode side of the proton exchange membrane 11. The anode carbon felt 12 has a porous structure, which increases the reaction contact area, improves the utilization rate of active materials, and enhances reaction efficiency. The cathode carbon felt 13 is located inside the cathode electrode frame 15 and is in close contact with the cathode side of the proton exchange membrane 11. The cathode carbon felt 13 has a porous structure, which can increase the reaction contact area, improve the utilization rate of active materials, and enhance the reaction efficiency. The anode electrode frame 14 is roughly frame-shaped and is set at the edge of the anode carbon felt 12. It is used to fix the anode carbon felt 12 to prevent displacement and to form a sealed space to prevent electrolyte leakage. The cathode electrode frame 15 is roughly frame-shaped and is set at the edge of the cathode carbon felt 13. It is used to fix the cathode carbon felt 13 to prevent displacement and to form a sealed space to prevent electrolyte leakage. The anode bipolar plate 16 has a flow field channel inside for the flow of electrolyte. The anode bipolar plate 16 is located on the outermost side of the anode of the battery cell 1 and is adjacent to the anode electrode frame 14. The flow field structure inside the anode bipolar plate 16 is used to guide the electrolyte to flow evenly through the anode carbon felt 12, ensuring sufficient reaction and improving the reaction efficiency of the battery cell 1. The cathode bipolar plate 17 has a flow field channel inside for the flow of electrolyte. The cathode bipolar plate 17 is located on the outermost side of the cathode of the battery cell 1 and is adjacent to the cathode electrode frame 15. The flow field structure inside the cathode bipolar plate 17 is used to guide the electrolyte to flow evenly through the cathode carbon felt 13, ensuring sufficient reaction and improving the reaction efficiency of the battery cell 1.

[0027] In some embodiments, multiple power-taking components 2 are provided, located on both sides of the battery cell 1, and respectively attached to both sides of the anode bipolar plate 16 and cathode bipolar plate 17 of the battery cell 1. Each battery module 5 has two battery cells 1. Figure 3 , Figure 4As shown, each battery module 5 includes two battery cells 1, three power-collecting components 2, and a first conductive component 3. The two battery cells 1 are symmetrically arranged, meaning the anode side of one battery cell 1 faces the anode side of the other battery cell 1. The anode side of the two battery cells 1 shares a common power-collecting component 2 to collect the current from the opposing anode sides of the two battery cells 1. The other two power-collecting components 2 are respectively located on the cathode sides of the two battery cells 1, to collect the current from the cathode sides of the two battery cells 1. Each power-collecting component 2 has tabs 21. The tabs 21 of the two outer power-collecting components 2 are located on the same side, while the tabs 21 of the two outer power-collecting components 2 are located on different sides from the tabs 21 of the power-collecting component 2 between the two battery cells 1. The first conductive component 3 connects the two outer power-collecting components 2, linking the external current paths of the two battery cells 1, thus forming a parallel circuit. This parallel connection of the two battery cells 2 makes the output current of the battery module 5 twice that of a single battery cell 1, thereby increasing the power output. The battery module 5 uses two oppositely arranged battery cells 2 to collect current through three power-collecting components 2, and connects them in parallel through the first conductive component 3. This not only doubles the current, but also makes the potential difference between the opposite sides of the two battery cells 1 zero, fundamentally eliminating the bypass current of adjacent batteries in the traditional series structure, reducing energy loss and component loss, and significantly improving the efficiency and lifespan of the battery module 5.

[0028] In other embodiments, the two battery cells 1 are symmetrically arranged, that is, the cathode side of one battery cell 1 is opposite to the cathode side of the other battery cell 1. The cathode sides of the two battery cells 1 share a common power-collecting element 2 for collecting the current on the opposite cathode sides of the two battery cells 1. The other two power-collecting elements 2 are respectively arranged on the anode sides of the two battery cells 1 to collect the current on the anode sides of the two battery cells 1 respectively.

[0029] As an example, the power-taking component 2 uses a power-taking copper plate, and the first power-taking component 2 uses a soft copper busbar.

[0030] In some embodiments, the insulating element 6 is disposed between two adjacent battery modules 5. A second conductive element 4 is disposed on each side of the two adjacent battery modules 4. One end of one second conductive element 4 is connected to the tab 21 of the anode-side power take-off element 2 of the preceding battery module 5, and the other end is connected to the tab 21 of the cathode-side power take-off element 2 of the following battery module 5. The other second conductive element 4 is connected to the tab 21 of the cathode-side power take-off element 2 of the preceding battery module 5, and the other end is connected to the tab 21 of the anode-side power take-off element 2 of the following battery module 5. That is, through the connection of the second conductive elements 4, current can flow from the output terminal of the preceding battery module 5 to the input terminal of the following battery module 5, forming a continuous series current loop and achieving the accumulation of total voltage. The second conductive elements 4 connect multiple parallel battery modules 5 in series, causing the voltages of each battery module 5 to be superimposed, thereby increasing the total output voltage of the entire battery stack 100.

[0031] The assembly process of the flow battery stack 100 of the present invention is as follows: First, the battery unit 1 is assembled by stacking the following components in sequence: anode bipolar plate 16, anode electrode frame 14, anode carbon felt 12, proton exchange membrane 11, cathode carbon felt 13, cathode electrode frame 15, and cathode bipolar plate 17, to form a single battery unit 1, ensuring that the edges of each component are aligned and tightly fitted. Then, two battery units 1 are taken and their anode sides are placed opposite each other. A power-collecting component 2 is placed between the two anode bipolar plates 16, and a power-collecting component 2 is placed on the outer cathode bipolar plates 17 of the two battery units 1 respectively to ensure power collection. The component 2 is tightly attached to the bipolar plate, and the tabs 21 of the two outer power-taking components 2 are connected through the first conductive component 3 to form a parallel battery module 5. Finally, multiple battery modules 5 are arranged in sequence, and an insulating component 6 is placed between adjacent battery modules 5. The tabs 21 of the anode side power-taking component 2 of the previous battery module 5 are connected to the tabs 21 of the cathode side power-taking component 2 of the next battery module 5 through the second conductive component 4, and the tabs 21 of the cathode side power-taking component 2 of the previous battery module 5 are connected to the tabs 21 of the anode side power-taking component 2 of the next battery module 5 to form a series circuit, thus completing the assembly of the entire battery stack 100.

[0032] The flow battery stack 100 of the present invention includes multiple battery cells, power extraction components disposed on both sides of the battery cells, a first conductive component connecting the battery cells in parallel, a second conductive component connecting the parallel battery cells in series, and an insulating component; wherein, at least two of the battery cells are connected in parallel through the first conductive component to form a battery module, the insulating component is disposed between two adjacent battery modules, and multiple battery modules are connected in series through the second conductive component; the flow battery stack 100 of the present invention connects two battery cells 1 in parallel through the first conductive component 3 to form a battery module 5, thereby doubling the output current of a single battery module 5, compared with the conventional By increasing the reaction area of ​​a single cell to increase the current, uneven electrolyte distribution and local mass transfer problems caused by excessive area are avoided, ensuring the stability of the stack performance. The two battery cells 1 in the battery module 5 are symmetrically arranged with the anode facing each other or the cathode facing each other, so that the potential difference between the opposite sides of the adjacent cells is 0, which fundamentally eliminates the bypass current caused by the conductivity of the electrolyte in the traditional series structure and reduces energy loss. Multiple battery modules 5 are connected in series by the second conductive element 4, so that the total output voltage of the stack is equal to the sum of the voltages of each module, which meets the requirements of high voltage application scenarios and improves the adaptability and performance of the overall system.

[0033] Example 2 This embodiment provides a flow battery stack 100, including multiple battery cells 1, power-collecting components 2 disposed on both sides of the battery cells 1, a first conductive component 3 connecting the battery cells 1 in parallel, a second conductive component 4 connecting the parallel battery cells 1 in series, and an insulating component 6. Three battery cells 1 are connected in parallel via the first conductive component 3 to form a battery module 5. The insulating component 6 is disposed between two adjacent battery modules 5, and multiple battery modules 5 are connected in series via the second conductive component 4. The battery cells 1 generate electrical energy through the redox reaction of the flow battery electrolyte; the power-collecting components 2 collect the current generated by the battery cells 1; the first conductive component 3 connects the three battery cells 1 in parallel; and the second conductive component 4 connects the battery modules 5 in series.

[0034] In some embodiments, the structures of the battery cell 1, the power taking component 2, the first conductive component 3, the second conductive component 4, and the insulating component 6 are the same as in Embodiment 1.

[0035] In some embodiments, each battery module 5 includes three battery cells 1, four power-collecting components 2, and two first conductive components 3. The anode side of the first battery cell 1 is positioned opposite to the anode side of the second battery cell 1, and the cathode side of the second anode cell 1 is positioned opposite to the cathode side of the third battery cell 1. A single power-collecting component 2 is shared between the anode sides of the first and second battery cells 1 to collect the anode-side current between them. Similarly, a single power-collecting component 2 is shared between the cathode sides of the second and third battery cells 1 to collect the cathode-side current between them. Additionally, a power-collecting component 2 is located on the cathode side of the outermost first battery cell 1 to collect its cathode-side current, and a single power-collecting component 2 is located on the anode side of the outermost third battery cell 1 to collect its anode-side current. One end of one of the first conductive elements 3 is connected to the power-taking element 2 located between the anode side of the first battery cell 1 and the anode side of the second battery cell 1, and the other end is connected to the power-taking element 2 located on the anode side of the third battery cell 1 on the outside. The other first conductive element 3 has one end connected to the power-taking element 2 located between the cathode side of the second battery cell 1 and the cathode side of the third battery cell 1, and the other end connected to the power-taking element 2 located on the cathode side of the first battery cell 1 on the outside. The first conductive elements 3 connect the outer current paths of the three battery cells 1, forming a parallel circuit between the three battery cells 2. This parallel connection of the three battery cells 2 makes the output current of the battery module 5 equivalent to three times that of a single battery cell 1, thereby increasing the power output. The battery module 5 uses three battery cells 1 and four power collection components 2 to collect current, and connects them in parallel through two first conductive components 3. This not only increases the current to three times that of a single battery cell 1, but also makes the potential difference between the three battery cells 1 on opposite sides zero. This fundamentally eliminates the bypass current of adjacent batteries in the traditional series structure, reduces energy loss and component loss, and significantly improves the efficiency and lifespan of the battery module 5.

[0036] In some embodiments, the insulating element 6 is disposed between two adjacent battery modules 5. A second conductive element 4 is disposed on each side of the two adjacent battery modules 4. One end of one second conductive element 4 is connected to the tab 21 of the anode-side power take-off element 2 of the preceding battery module 5, and the other end is connected to the tab 21 of the cathode-side power take-off element 2 of the following battery module 5. The other second conductive element 4 is connected to the tab 21 of the cathode-side power take-off element 2 of the preceding battery module 5, and the other end is connected to the tab 21 of the anode-side power take-off element 2 of the following battery module 5. That is, through the connection of the second conductive elements 4, current can flow from the output terminal of the preceding battery module 5 to the input terminal of the following battery module 5, forming a continuous series current loop and achieving the accumulation of total voltage. The second conductive elements 4 connect multiple parallel battery modules 5 in series, causing the voltages of each battery module 5 to be superimposed, thereby increasing the total output voltage of the entire battery stack 100.

[0037] The assembly process of the flow battery stack 100 of the present invention is as follows: First, battery cells 1 are assembled. They are stacked sequentially in the following order: anode bipolar plate 16, anode electrode frame 14, anode carbon felt 12, proton exchange membrane 11, cathode carbon felt 13, cathode electrode frame 15, and cathode bipolar plate 17, forming a single battery cell 1, ensuring that the edges of each component are aligned and tightly fitted. Then, three battery cells 1 are taken, and the anode side of the first battery cell 1 is placed opposite the anode side of the second battery cell 1, with a power-collecting component 2 placed between them. The cathode side of the second battery cell 1 is placed opposite the cathode side of the third battery cell 1, with a power-collecting component 2 placed between them. A power-collecting component 2 is placed on the outer cathode bipolar plate 17 of the first battery cell 1, and a power-collecting component 2 is placed on the outer anode bipolar plate 16 of the third battery cell 1. Two first conductive components 3 are used to connect the power-collecting components 2 between the first and second battery cells 1, the outer power-collecting component 2 of the third battery cell 1, and the power-collecting component 2 between the second and third battery cells 1, respectively. The battery modules 5 are connected in parallel with the power taking component 2 on the outside of the first battery unit 1. Finally, multiple battery modules 5 are arranged in sequence, with an insulating component 6 placed between adjacent battery modules 5. The tab 21 of the anode side power taking component 2 of the previous battery module 5 is connected to the tab 21 of the cathode side power taking component 2 of the next battery module 5 through the second conductive component 4, and the tab 21 of the cathode side power taking component 2 of the previous battery module 5 is connected to the tab 21 of the anode side power taking component 2 of the next battery module 5, forming a series circuit and completing the assembly of the entire battery stack 100.

[0038] The flow battery stack 100 of the present invention includes multiple battery cells, power collection components disposed on both sides of the battery cells, a first conductive component connecting the battery cells in parallel, a second conductive component connecting the parallel battery cells in series, and an insulating component; wherein at least two battery cells are connected in parallel through the first conductive component to form a battery module, the insulating component is disposed between two adjacent battery modules, and multiple battery modules are connected in series through the second conductive component; the flow battery stack 100 of the present invention arranges three battery cells 1 alternately with the anode and cathode facing each other, collects current using four power collection components 2, and connects the current through two second conductive components. A single conductive element 3 enables parallel connection, allowing the output current of the battery module 5 to reach three times that of a single battery cell 1, effectively improving power output. Simultaneously, the potential difference between the three battery cells 1 on opposite sides is zero, fundamentally eliminating the bypass current between adjacent batteries in the traditional series structure, reducing energy loss and component wear, and significantly improving the efficiency and lifespan of the battery module. Furthermore, multiple battery modules 5 are connected in series through a second conductive element 4, achieving the superposition of the total voltage, meeting high voltage requirements, and the installation of the insulating element 6 ensures safety between adjacent modules, ensuring efficient and stable operation of the stack, suitable for higher power energy storage scenarios.

[0039] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of the present invention. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A flow battery stack, characterized in that, include: The battery module comprises multiple battery cells, power-collecting components disposed on both sides of the battery cells, a first conductive component connecting the battery cells in parallel, a second conductive component connecting the parallel battery cells in series, and an insulating component. At least two battery cells are connected in parallel through the first conductive component to form a battery module. The insulating component is disposed between two adjacent battery modules. Multiple battery modules are connected in series through the second conductive component.

2. The flow battery stack according to claim 1, characterized in that, The battery cell includes a proton exchange membrane, an anode carbon felt and a cathode carbon felt symmetrically arranged on both sides of the proton exchange membrane, an anode electrode frame, a cathode electrode frame, an anode bipolar plate, and a cathode bipolar plate; wherein, the proton exchange membrane is located between the anode carbon felt and the cathode carbon felt, the anode bipolar plate is located on the outermost side of the anode of the battery cell and adjacent to the anode electrode frame, and the cathode bipolar plate is located on the outermost side of the cathode of the battery cell and adjacent to the cathode electrode frame.

3. The flow battery stack according to claim 1, characterized in that, Each of the battery modules includes two symmetrically arranged battery cells, three power-collecting components, and a first conductive component.

4. The flow battery stack according to claim 3, characterized in that, The anode sides of the two battery cells are arranged opposite each other, and the anode sides of the two battery cells share a common power-taking component. The other two power-taking components are respectively arranged on the cathode sides outside the two battery cells. The first conductive component connects the two power-taking components located on the outside, so that the two battery cells form a parallel circuit.

5. The flow battery stack according to claim 4, characterized in that, The power taking component is provided with tabs. The tabs of the two power taking components located on the outer side are located on the same side, while the tabs of the power taking components between the two battery cells are located on different sides.

6. The flow battery stack according to claim 5, characterized in that, When the second conductive element is connected to an adjacent battery module, one end of one of the second conductive elements is connected to the tab of the anode-side power taking component of the preceding battery module, and the other end is connected to the tab of the cathode-side power taking component of the following battery module; one end of the other second conductive element is connected to the tab of the cathode-side power taking component of the preceding battery module, and the other end is connected to the tab of the anode-side power taking component of the following battery module, forming a series circuit.

7. The flow battery stack according to claim 1, characterized in that, Each of the battery modules includes three of the battery cells, four of the power-collecting components, and two of the first conductive components.

8. The flow battery stack according to claim 7, characterized in that, The anode side of the first battery cell is disposed opposite to the anode side of the second battery cell, and the cathode side of the second battery cell is disposed opposite to the cathode side of the third battery cell.

9. The flow battery stack according to claim 8, characterized in that, The anode side of the first battery cell and the anode side of the second battery cell share a common power-taking device, and the cathode side of the second battery cell and the cathode side of the third battery cell share a common power-taking device. A power-taking device is provided on the cathode side of the first battery cell located on the outer side, and a power-taking device is provided on the anode side of the third battery cell located on the outer side.

10. The flow battery stack according to claim 9, characterized in that, One end of one of the first conductive elements is connected to the power-taking element located between the anode side of the first battery cell and the anode side of the second battery cell, and the other end is connected to the power-taking element located on the anode side of the third battery cell on the outside; one end of the other first conductive element is connected to the power-taking element located between the cathode side of the second battery cell and the cathode side of the third battery cell, and the other end is connected to the power-taking element located on the cathode side of the first battery cell on the outside. The first conductive elements connect the outer current paths of the three battery cells, so that the three battery cells form a parallel circuit.

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