Negative electrode assembly, flow battery negative electrode assembly and zinc-iron flow battery

Abstract

The invention discloses a negative electrode assembly, a flow battery negative electrode assembly and a zinc-iron flow battery, and the negative electrode assembly comprises: a negative electrode inner frame having an electrode fixing hole; the negative electrode body is arranged in the electrode fixing hole; the two negative electrode outer frames are respectively arranged on the upper side and the lower side of the negative electrode inner frame, and fastening holes assembled with other components of the zinc-iron flow battery are formed in the negative electrode outer frames; and the fixing piece is used for fixing the negative electrode inner frame between the two negative electrode outer frames. According to the invention, the negative electrode body can be quickly replaced on the basis of not disassembling the whole zinc-iron flow battery, the phenomenon of mass transfer deterioration in the battery caused by dendritic crystals can be improved, meanwhile, the threat of the dendritic crystals to the diaphragm is effectively avoided, and efficient and stable operation of the zinc-iron flow battery is facilitated. The zinc-iron flow battery is simple in design and relatively low in cost, long-time operation of the zinc-iron flow battery can be realized by replacing the negative electrode body for multiple times, and the zinc-iron flow battery can be favorably used as large-scale long-time energy storage equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of zinc-iron liquid flow batteries, and more specifically, to a negative electrode assembly, a liquid flow battery negative electrode assembly and a zinc-iron liquid flow battery. Background Art

[0002] As a new energy storage technology with the advantages of large-scale energy storage, long life and high safety, flow batteries are gradually showing great potential for commercial application worldwide. The current research and development focus is on the exploration of diversified flow battery types, including iron-chromium, all-vanadium, zinc-bromine, zinc-nickel, zinc-iron, all-iron and other systems. Each type has its unique performance and applicable scenarios, providing a broad choice space for the widespread application of flow batteries.

[0003] Alkaline zinc-iron flow batteries have attracted widespread attention due to their advantages such as high open circuit voltage, high energy density, low cost and high safety. However, the negative electrode involves zinc deposition and dissolution during the charging and discharging process, and the growth of zinc dendrites will affect the internal mass transfer of the battery. In severe cases, it may cause the diaphragm to puncture, causing a battery short circuit, which is not conducive to the stable operation of the battery.

[0004] When the growth of zinc dendrites at the negative electrode is serious, it is necessary to stop the charging process of the alkaline zinc-iron flow battery, then remove the negative electrode and replace it with a new one to prevent the zinc dendrites from piercing the diaphragm. However, in the prior art, in order to disassemble the negative electrode, the entire alkaline zinc-iron flow battery needs to be disassembled, and the disassembly and assembly process is relatively complicated.

[0005] A Chinese patent document with publication number CN 118073596 A discloses a zinc-based flow battery with a movable negative electrode, which can drive the negative electrode to move by adding a winding assembly to prevent the growth of negative zinc dendrites and cause the diaphragm to be pierced. That is, the solution disclosed in the patent is to replace the negative electrode by moving the negative electrode through a winding assembly. Since this structure requires the addition of a winding assembly, that is, the configuration of a corresponding rotating shaft, a driving device, etc., and the need to change the shape of the negative electrode, the negative electrode is designed as a winding structure, the structure is relatively complex, and the cost is relatively high.

[0006] Therefore, how to simplify the replacement process of the negative electrode without significantly increasing the cost is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0007] In view of this, an object of the present invention is to provide a negative electrode assembly to simplify the replacement process of the negative electrode without significantly increasing the cost;

[0008] Another object of the present invention is to provide a liquid flow battery negative electrode assembly and a zinc-iron liquid flow battery having the above-mentioned negative electrode assembly.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A negative electrode assembly, comprising:

[0011] A negative electrode inner frame having an electrode fixing hole;

[0012] A negative electrode body is disposed in the electrode fixing hole;

[0013] There are two negative electrode outer frames, which are respectively arranged on the upper and lower sides of the negative electrode inner frame, and the negative electrode outer frames are provided with fastening holes for assembling with other components of the zinc-iron liquid flow battery;

[0014] A fixing member is used to fix the negative electrode inner frame between the two negative electrode outer frames.

[0015] Optionally, in the above-mentioned negative electrode assembly, a first threaded half hole is provided on the negative electrode inner frame, and a second threaded half hole opposite to the first threaded half hole is provided on the negative electrode outer frame, and the first threaded half hole and the second threaded half hole constitute a threaded hole that cooperates with the thread of the fixing member.

[0016] Optionally, in the above-mentioned negative electrode assembly, there are four fixing members, and one fixing member is provided at each end of the contact point between the negative electrode inner frame and the upper negative electrode outer frame;

[0017] The fixing member is disposed at both ends of the contact point between the negative electrode inner frame and the negative electrode outer frame below.

[0018] Optionally, in the above-mentioned negative electrode assembly, the fixing member includes a sliding latch and a locking sleeve, one of the sliding latch and the locking sleeve is arranged on the negative electrode inner frame, and the other is arranged on the negative electrode outer frame;

[0019] The sliding latch includes a sliding seat and a sliding pin slidably matched with the sliding seat. The sliding pin can slide between a locking position and an unlocking position. When in the locking position, the sliding pin is inserted into the locking sleeve. When in the unlocking position, the sliding pin is disengaged from the locking sleeve.

[0020] Optionally, in the above-mentioned negative electrode assembly, there are four fixing members, and one fixing member is provided at each end of the contact point between the negative electrode inner frame and the upper negative electrode outer frame;

[0021] The fixing member is disposed at both ends of the contact point between the negative electrode inner frame and the negative electrode outer frame below.

[0022] Optionally, in the above-mentioned negative electrode assembly, a first guide portion is provided on the side of the negative electrode inner frame facing the negative electrode outer frame, and a second guide portion slidably matched with the first guide portion is provided on the side of the negative electrode outer frame facing the negative electrode inner frame.

[0023] Optionally, in the above-mentioned negative electrode assembly, one of the first guide portion and the second guide portion is a slide rail, and the other is a slide groove.

[0024] Optionally, in the above-mentioned negative electrode assembly, a slot for inserting the negative electrode inner frame is formed between the two negative electrode outer frames, the negative electrode inner frame is inserted into the slot from the first end of the negative electrode outer frame, and the second end of the negative electrode outer frame is provided with a limiting portion for limiting the installation position of the negative electrode inner frame.

[0025] The negative electrode assembly provided by the present invention is assembled with other components of the zinc-iron liquid flow battery through the negative electrode outer frame, and the negative electrode inner frame is used to fix and support the negative electrode body. The negative electrode inner frame is fixed to the negative electrode outer frame by a fixing piece to ensure the mechanical strength of the structure. When the dendrite growth is serious, the charging process of the zinc-iron liquid flow battery can be stopped, and the various fixings used to connect the negative electrode inner frame and the negative electrode outer frame can be removed, and the negative electrode inner frame can be pulled out. Take out the old negative electrode body fixed in the negative electrode inner frame, and fix the new negative electrode body on the negative electrode inner frame, and then reinsert the negative electrode inner frame into the zinc-iron liquid flow battery, and fix the negative electrode inner frame and the negative electrode outer frame by fixing pieces, so that the negative electrode body can be replaced, and the negative impact of the continuous growth of dendrites on the diaphragm and battery performance can be reduced.

[0026] Compared with the prior art, the present invention can realize the rapid replacement of the negative electrode body without disassembling the entire zinc-iron flow battery, can improve the deterioration of the internal mass transfer of the battery caused by dendrites, and effectively avoid the threat of dendrites to the diaphragm, which is conducive to the efficient and stable operation of the zinc-iron flow battery. The present invention is simple in design, easy to use in the operation process, and low in cost. There is no upper limit on the degree of inhibition of zinc dendrites. In theory, the long-term operation of the zinc-iron flow battery can be achieved by replacing the negative electrode body multiple times, which is more conducive to its role as a large-scale long-term energy storage equipment.

[0027] A negative electrode assembly of a liquid flow battery, comprising:

[0028] A negative electrode assembly, which is a negative electrode assembly as described in any one of the above items;

[0029] A negative bipolar plate, a negative current collecting plate and a negative terminal plate are sequentially stacked and arranged on one side of the negative electrode assembly.

[0030] The liquid flow battery negative electrode assembly provided by the present invention has all the technical effects of the above-mentioned negative electrode assembly due to its inclusion of the above-mentioned negative electrode assembly, which will not be described in detail herein.

[0031] A zinc-iron liquid flow battery, comprising:

[0032] A liquid flow battery negative electrode assembly, which is the liquid flow battery negative electrode assembly as described above;

[0033] A positive electrode assembly of a liquid flow battery, comprising a positive electrode assembly, a positive bipolar plate, a positive current collecting plate and a positive terminal plate which are stacked in sequence, wherein the positive electrode assembly and the negative electrode assembly are arranged opposite to each other;

[0034] A separator is arranged between the positive electrode assembly and the negative electrode assembly

[0035] The zinc-iron liquid flow battery provided by the invention has all the technical effects of the above-mentioned liquid flow battery negative electrode assembly, and will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 An exploded diagram of a zinc-iron flow battery disclosed in an embodiment of the present invention;

[0038] Figure 2 A cross-sectional view of a negative electrode assembly disclosed in an embodiment of the present invention;

[0039] Figure 3 A cross-sectional view of a negative electrode assembly disclosed in another embodiment of the present invention.

[0040] The meanings of the reference numerals in the figures are as follows:

[0041] 100-liquid flow battery positive electrode assembly; 101-positive terminal plate; 102-positive current collecting plate; 103-positive bipolar plate; 104-positive electrode assembly;

[0042] 200-liquid flow battery negative electrode assembly; 201-negative terminal plate; 202-negative current collecting plate; 203-negative bipolar plate; 204-negative electrode assembly; 2041-negative electrode body; 2042-negative electrode inner frame; 2043-negative electrode outer frame; 2044-fixing piece; 20441-sliding seat; 20442-sliding pin; 20443-locking sleeve; 2045-electrode fixing piece; 2046-fastening hole;

[0043] 300-Diaphragm. DETAILED DESCRIPTION

[0044] The core of the present invention is to provide a negative electrode assembly to simplify the replacement process of the negative electrode without significantly increasing the cost;

[0045] Another core of the present invention is to provide a liquid flow battery negative electrode assembly and a zinc-iron liquid flow battery having the above-mentioned negative electrode assembly.

[0046] The following embodiments are described with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the invention contents described in the claims. In addition, the entire contents of the structures represented by the following embodiments are not limited to those necessary as solutions to the inventions described in the claims. It should be noted that, for ease of description, only the parts related to the inventions are shown in the accompanying drawings. The embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0047] like Figure 1-Figure 3 As shown, the negative electrode assembly disclosed in the embodiment of the present invention includes a negative electrode inner frame 2042, a negative electrode body 2041 (usually a carbon felt electrode) and a negative electrode outer frame 2043. Among them, the negative electrode inner frame 2042 has an electrode fixing hole, and the negative electrode body 2041 is arranged in the electrode fixing hole. Specifically, the negative electrode body 2041 can be fixed in the fixing hole of the negative electrode inner frame 2042 by an electrode fixing member 2045. The electrode fixing member 2045 can be a fixing member such as a buckle, a flat splint, etc., as long as the negative electrode body 2041 can be fastened to the negative electrode inner frame 2042. This embodiment does not limit the specific type of the electrode fixing member 2045.

[0048] There are two negative electrode outer frames 2043, which are respectively arranged on the upper and lower sides of the negative electrode inner frame 2042. Since the negative electrode outer frames 2043 are only arranged on the upper and lower sides of the negative electrode inner frame 2042, the negative electrode inner frame 2042 can be inserted into the space between the two negative electrode outer frames 2043, and can also be pulled out of the space between the two negative electrode outer frames 2043. The negative electrode outer frame 2043 is provided with fastening holes 2046 for assembling with other components of the zinc-iron liquid flow battery, that is, the various components of the zinc-iron liquid flow battery are fastened by fasteners through the fastening holes at the same position as the fastening holes 2046 on the negative electrode outer frame 2043, that is, the negative electrode outer frame 2043 needs to be fastened with other components of the zinc-iron liquid flow battery, while the negative electrode inner frame 2042 does not need to be fixed with other components of the zinc-iron liquid flow battery.

[0049] The fixing member 2044 is used to fix the negative electrode inner frame 2042 between the two negative electrode outer frames 2043. The negative electrode inner frame 2042 is fixed to the negative electrode outer frame 2043 through the fixing member 2044, thereby fixing the negative electrode inner frame 2042 on the zinc-iron liquid flow battery.

[0050] The negative electrode assembly 204 disclosed in the embodiment of the present invention is assembled with other components of the zinc-iron liquid flow battery through the negative electrode outer frame 2043, and the negative electrode inner frame 2042 is used to fix and support the negative electrode body 2041. The negative electrode inner frame 2042 is fixed to the negative electrode outer frame 2043 through the fixing member 2044 to ensure the mechanical strength of the structure. When the dendrite growth is serious, the charging process of the zinc-iron liquid flow battery can be stopped, and the fixing members 2044 used to connect the negative electrode inner frame 2042 and the negative electrode outer frame 2043 can be removed, and the negative electrode inner frame 2042 can be pulled out. Take out the old negative electrode body 2041 fixed in the negative electrode inner frame 2042, and fix the new negative electrode body 2041 on the negative electrode inner frame 2042, then reinsert the negative electrode inner frame 2042 into the zinc-iron liquid flow battery, and fix the negative electrode inner frame 2042 and the negative electrode outer frame 2043 through the fixing part 2044, so as to realize the replacement of the negative electrode body 2041 and reduce the negative impact of the continuous growth of dendrites on the diaphragm 300 and battery performance.

[0051] Compared with the prior art, the present invention can realize the rapid replacement of the negative electrode body 2041 without disassembling the entire zinc-iron liquid flow battery, can improve the deterioration of the internal mass transfer of the battery caused by dendrites, and effectively avoid the threat of dendrites to the diaphragm, which is conducive to the efficient and stable operation of the zinc-iron liquid flow battery. The present invention is simple in design, easy to use in the operation process, and low in cost, and there is no upper limit on the degree of inhibition of zinc dendrites. In theory, the negative electrode body 2041 can be replaced multiple times to achieve long-term operation of the zinc-iron liquid flow battery, which is more conducive to its role as a large-scale long-term energy storage equipment.

[0052] like Figure 2 As shown in a specific embodiment of the present invention, a first threaded half hole is provided on the negative electrode inner frame 2042, and a second threaded half hole opposite to the first threaded half hole is provided on the negative electrode outer frame 2043, and the first threaded half hole and the second threaded half hole constitute a threaded hole that is threadedly matched with the fixing member 2044.

[0053] In this embodiment, the fixing member 2044 is a fastening bolt, and the threaded hole matched with the fastening bolt is divided into two parts (a first threaded half hole and a second threaded half hole) along the radial direction, one part is arranged on the negative electrode outer frame 2043, and the other part is arranged on the negative electrode inner frame 2042. When the negative electrode inner frame 2042 is inserted into the space between the two negative electrode outer frames 2043, the first threaded half hole and the second threaded half hole will move relative to each other and gradually align until the first threaded half hole and the second threaded half hole can form a completed threaded hole, and then the fixing member 2044 can be screwed in.

[0054] After the fixing member 2044 is screwed into the threaded hole composed of the first threaded half hole and the second threaded half hole, the negative electrode inner frame 2042 cannot move up and down (i.e., the direction of approaching and moving away from the negative electrode outer frame 2043), and the up and down movement will be constrained by the negative electrode outer frame 2043 on both sides; the negative electrode inner frame 2042 cannot move along the extension direction parallel to the negative electrode outer frame 2043, and will be constrained by the fixing member 2044 when moving along the extension direction of the negative electrode outer frame 2043; similarly, the negative electrode inner frame 2042 cannot move along the direction of the plate surface of the negative electrode inner frame 2042, and will also be constrained by the fixing member 2044. In this way, the negative electrode inner frame 2042 is constrained in three directions of space and cannot move. Only by removing the fixing member 2044 can the negative electrode inner frame 2042 have the freedom of movement. The fixing method of this embodiment is relatively convenient and quick to disassemble and assemble, and can effectively realize the fixation of the negative electrode inner frame 2042.

[0055] Specifically, there are four fixing members 2044 , and a fixing member 2044 is provided at both ends of the contact point between the negative electrode inner frame 2042 and the upper negative electrode outer frame 2043 , that is, the upper negative electrode outer frame 2043 is fixed to the upper side of the negative electrode inner frame 2042 by two fixing members 2044 .

[0056] A fixing piece 2044 is provided at both ends of the contact point between the negative electrode inner frame 2042 and the negative electrode outer frame 2043 below, that is, the negative electrode outer frame 2043 below is fixed to the lower side of the negative electrode inner frame 2042 through two fixing pieces 2044 .

[0057] like Figure 3 As shown, the fixing member 2044 includes a sliding latch and a locking sleeve 20443, one of which is disposed on the negative electrode inner frame 2042, and the other is disposed on the negative electrode outer frame 2043. Taking the sliding latch disposed on the negative electrode outer frame 2043 as an example, the locking sleeve 20443 is installed on the negative electrode inner frame 2042.

[0058] The sliding latch includes a sliding seat 20441 and a sliding pin 20442 that slides with the sliding seat 20441. The sliding pin 20442 can slide between a locking position and an unlocking position. When in the locking position, the sliding pin 20442 is inserted into the locking sleeve 20443. When in the unlocking position, the sliding pin 20442 is disengaged from the locking sleeve 20443.

[0059] Before inserting the negative electrode inner frame 2042 into the space between the two negative electrode outer frames 2043, the sliding pin 20442 needs to be moved along the sliding seat 20441 to the unlocking position to prevent the sliding pin 20442 from preventing the negative electrode inner frame 2042 from being inserted into the space between the two negative electrode outer frames 2043. After the negative electrode inner frame 2042 is inserted into the space between the two negative electrode outer frames 2043, the locking sleeve 20443 on the negative electrode inner frame 2042 exactly corresponds to the sliding pin 20442 on the negative electrode outer frame 2043, and then the sliding pin 20442 is slid to the locking position, that is, the sliding pin 20442 is inserted into the locking sleeve 20443.

[0060] At this time, the negative electrode inner frame 2042 cannot move up and down (i.e., the direction of approaching and moving away from the negative electrode outer frame 2043), and the up and down movement will be constrained by the negative electrode outer frame 2043 on both sides; the negative electrode inner frame 2042 cannot move along the extension direction parallel to the negative electrode outer frame 2043, and will be constrained by the sliding pin 20442 and the locking sleeve 20443 after moving along the extension direction of the negative electrode outer frame 2043; similarly, the negative electrode inner frame 2042 cannot move along the direction of the plate surface of the negative electrode inner frame 2042, and will also be constrained by the sliding pin 20442 and the locking sleeve 20443 after they cooperate. In this way, the negative electrode inner frame 2042 is constrained in three directions of space and cannot move. Only by removing the fixing member 2044 can the negative electrode inner frame 2042 have the freedom of movement. The fixing method of this embodiment is relatively convenient and quick to disassemble and assemble, and can effectively realize the fixing of the negative electrode inner frame 2042.

[0061] It should be noted that the sliding pin can be a spring pin, that is, under the reset action of its spring force, the sliding pin 20442 maintains the matching state with the lock sleeve 20443 to ensure the reliability of locking. When unlocking is required, the sliding pin 20442 needs to be manually slid to overcome the spring force, and then the negative electrode inner frame 2042 can be pulled out.

[0062] In this embodiment, there should also be four fixing parts 2044, and a fixing part 2044 is provided at both ends of the contact point between the negative electrode inner frame 2042 and the upper negative electrode outer frame 2043, that is, the upper negative electrode outer frame 2043 is fixed to the upper side of the negative electrode inner frame 2042 by two fixing parts 2044.

[0063] A fixing piece 2044 is provided at both ends of the contact point between the negative electrode inner frame 2042 and the negative electrode outer frame 2043 below, that is, the negative electrode outer frame 2043 below is fixed to the lower side of the negative electrode inner frame 2042 through two fixing pieces 2044 .

[0064] In a specific embodiment of the present invention, a first guide portion may be provided on the side of the negative electrode inner frame 2042 facing the negative electrode outer frame 2043, and a second guide portion slidably matched with the first guide portion may be provided on the side of the negative electrode outer frame 2043 facing the negative electrode inner frame 2042. When the negative electrode inner frame 2042 is pushed into the space between the two negative electrode outer frames 2043, the first guide portion and the second guide portion need to be aligned first, and then the negative electrode inner frame 2042 is pushed to install the negative electrode inner frame 2042 in place.

[0065] Specifically, one of the first guide portion and the second guide portion may be a slide rail, and the other may be a slide groove. In this embodiment, by providing a guide mechanism (i.e., the first guide portion and the second guide portion) between the negative electrode inner frame 2042 and the negative electrode outer frame 2043, the positional relationship between the negative electrode inner frame 2042 and the negative electrode outer frame 2043 can be guided to avoid deflection during pushing.

[0066] In a specific embodiment of the present invention, a slot for inserting the negative electrode inner frame 2042 is formed between the two negative electrode outer frames 2043, and the negative electrode inner frame 2042 is inserted into the slot from the first end of the negative electrode outer frame 2043. The second end of the negative electrode outer frame 2043 is provided with a limiting portion for limiting the installation position of the negative electrode inner frame 2042. After the replacement of the negative electrode body 2041 is completed, the negative electrode inner frame 2042 is inserted into the slot between the two negative electrode outer frames 2043 from the first end of the negative electrode outer frame 2043. When the end of the negative electrode inner frame 2042 abuts against the limiting portion, the negative electrode inner frame 2042 cannot be pushed further, which indicates that the negative electrode inner frame 2042 has been installed in place.

[0067] In this embodiment, a limiting portion is added to limit the installation position of the negative electrode inner frame 2042 to prevent the negative electrode inner frame 2042 from being pushed over or under-positioned during installation.

[0068] like Figure 1 As shown, the embodiment of the present invention further discloses a liquid flow battery negative electrode assembly 200, which may include a negative electrode assembly 204, a negative bipolar plate 203, a negative current collector plate 202, and a negative terminal plate 201. The negative bipolar plate 203, the negative current collector plate 202, and the negative terminal plate 201 are sequentially stacked and arranged on one side of the negative electrode assembly 204. The negative electrode assembly 204 is the negative electrode assembly 204 disclosed in the above embodiment. Since the above negative electrode assembly 204 is provided, all the technical effects of the above negative electrode assembly 204 are combined, and will not be repeated herein.

[0069] like Figure 1As shown, the embodiment of the present invention also discloses a zinc-iron liquid flow battery, which includes a liquid flow battery negative electrode assembly 200, a liquid flow battery positive electrode assembly 100 and a diaphragm 300. Among them, the liquid flow battery positive electrode assembly 100 includes a positive electrode assembly 104, a positive bipolar plate 103, a positive current collector plate 102 and a positive terminal plate 101 stacked in sequence. The liquid flow battery negative electrode assembly 200 is the liquid flow battery negative electrode assembly 200 disclosed in the above embodiment, and the positive electrode assembly 104 and the negative electrode assembly 204 are arranged relative to each other. The diaphragm 300 is arranged between the positive electrode assembly 104 and the negative electrode assembly 204. Due to the above-mentioned liquid flow battery negative electrode assembly 200, all the technical effects of the above-mentioned liquid flow battery negative electrode assembly 200 are combined, and this article will not repeat them here.

[0070] It should be noted that, except for the negative electrode assembly 204, the other components of the zinc-iron flow battery are the same as those in the prior art, so the functions and specific structures of other components are not described in detail in this embodiment.

[0071] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0072] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0073] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0074] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A negative electrode assembly, characterized in that: include: A negative electrode inner frame (2042) having an electrode fixing hole; A negative electrode body (2041) is arranged in the electrode fixing hole; There are two negative electrode outer frames (2043), which are respectively arranged on the upper and lower sides of the negative electrode inner frame (2042); the negative electrode outer frames (2043) are provided with fastening holes (2046) for assembling with other components of the zinc-iron liquid flow battery; A fixing member (2044) is used to fix the negative electrode inner frame (2042) between the two negative electrode outer frames (2043).

2. The negative electrode assembly according to claim 1, characterized in that: The negative electrode inner frame (2042) is provided with a first threaded half hole, and the negative electrode outer frame (2043) is provided with a second threaded half hole opposite to the first threaded half hole, the first threaded half hole and the second threaded half hole forming a threaded hole that is threadably matched with the fixing member (2044).

3. The negative electrode assembly according to claim 2, characterized in that: There are four fixing members (2044), and one fixing member (2044) is provided at each end of the contact point between the negative electrode inner frame (2042) and the upper negative electrode outer frame (2043); A fixing member (2044) is provided at each end of the contact point between the negative electrode inner frame (2042) and the negative electrode outer frame (2043) below.

4. The negative electrode assembly according to claim 1, characterized in that: The fixing member (2044) comprises a sliding latch and a locking sleeve (20443), one of the sliding latch and the locking sleeve (20443) being arranged on the negative electrode inner frame (2042), and the other being arranged on the negative electrode outer frame (2043); The sliding latch comprises a sliding seat (20441) and a sliding pin (20442) slidably matched with the sliding seat (20441); the sliding pin (20442) can slide between a locking position and an unlocking position, and when in the locking position, the sliding pin (20442) is inserted into the locking sleeve (20443); when in the unlocking position, the sliding pin (20442) is disengaged from the locking sleeve (20443).

5. The negative electrode assembly according to claim 4, characterized in that: There are four fixing members (2044), and one fixing member (2044) is provided at each end of the contact point between the negative electrode inner frame (2042) and the upper negative electrode outer frame (2043); A fixing member (2044) is provided at each end of the contact point between the negative electrode inner frame (2042) and the negative electrode outer frame (2043) below.

6. The negative electrode assembly according to any one of claims 1 to 5, characterized in that: A first guide portion is provided on the side of the negative electrode inner frame (2042) facing the negative electrode outer frame (2043), and a second guide portion slidably matched with the first guide portion is provided on the side of the negative electrode outer frame (2043) facing the negative electrode inner frame (2042).

7. The negative electrode assembly according to claim 6, characterized in that: One of the first guide portion and the second guide portion is a slide rail, and the other is a slide groove.

8. The negative electrode assembly according to any one of claims 1 to 5, characterized in that: A slot for inserting the negative electrode inner frame (2042) is formed between the two negative electrode outer frames (2043); the negative electrode inner frame (2042) is inserted into the slot from the first end of the negative electrode outer frame (2043); and a limiting portion for limiting the installation position of the negative electrode inner frame (2042) is provided at the second end of the negative electrode outer frame (2043).

9. A liquid flow battery negative electrode assembly, characterized in that: include: A negative electrode assembly (204), which is the negative electrode assembly (204) according to any one of claims 1 to 8; A negative bipolar plate (203), a negative current collecting plate (202) and a negative terminal plate (201) are sequentially stacked and arranged on one side of the negative electrode assembly (204).

10. A zinc-iron flow battery, characterized in that: include: A liquid flow battery negative electrode assembly (200), which is the liquid flow battery negative electrode assembly (200) as claimed in claim 9; A liquid flow battery positive electrode assembly (100) comprises a positive electrode assembly (104), a positive bipolar plate (103), a positive current collecting plate (102) and a positive terminal plate (101) which are sequentially stacked, wherein the positive electrode assembly (104) and the negative electrode assembly (204) are arranged relative to each other; A separator (300) is arranged between the positive electrode assembly (104) and the negative electrode assembly (204).

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