Anti-exudation flow battery stack and electrolyte recovery system

Abstract

The utility model discloses an anti-exosmosis flow battery stack and electrolyte recovery system, wherein the anti-exosmosis flow battery stack comprises: a plate frame for loading an electrode, a reaction zone is formed in the plate frame, one side of the plate frame close to the electrode is provided with a sealing groove close to the reaction zone, and the sealing groove is provided with a sealing ring. A sealing groove is formed in the plate frame, a sealing piece is embedded in the sealing groove to form a sealing area, a buffer flow guide groove is formed in the periphery of the sealing area, a flow guide channel is formed between the buffer flow guide groove and the sealing groove, a plurality of flow drainage grooves communicated with the buffer flow guide groove are formed in the bottom of the plate frame, and the flow drainage grooves are used for draining and guiding out leaked electrolyte; and a liquid receiving disc, the liquid receiving disc is provided with a liquid receiving port corresponding to the drainage groove, and a liquid storage cavity used for storing leaked liquid is formed in the liquid receiving disc. According to the utility model, the leaked electrolyte is guided through the buffer guide groove and the discharge groove, and is collected and temporarily stored by the liquid receiving disc, so that the corrosion damage of electricity to a battery stack is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of liquid flow battery, especially to a kind of anti-external exudation liquid flow battery electric pile and electrolyte recovery system. BACKGROUND

[0002] Liquid flow battery electric pile usually adopts pull rod to lock and fix the components such as end plate, bipolar plate, plate frame, electrode and ion membrane placed in turn and stacked, is influenced by the change of running environment, liquid flow battery long-term operation can cause material to change, thereby reduce the sealing reliability of electric pile, make the electric pile exist the risk of electrolyte leakage, and electrolyte leakage can corrode electric pile assembly, affect the performance of electric pile assembly, and electrolyte exudation can also affect the appearance of electric pile assembly.

[0003] At present, the common practice in the industry is to collect the electrolyte leaked from the electric pile, or to reduce the distance of the liquid flow leaked from the electric pile to reduce the corrosion and pollution to the electric pile. For example, the Chinese utility model patent with publication number CN219350281U discloses a leakage protection structure for all-vanadium liquid flow battery, which collects electrolyte through the setting of leakage groove and liquid accumulation tank to avoid corrosion damage to battery equipment or external environment caused by electrolyte overflow; the Chinese utility model patent with publication number CN222190817U discloses a leakage protection structure for all-vanadium liquid flow battery, which discharges through the setting of flow guide frame to reduce the flow length of leakage on the outer side wall of all-vanadium liquid flow battery components and the corrosion area of the outer side wall of all-vanadium liquid flow battery components. However, the existing leakage protection structure has a complex device structure and high processing and design cost. UTILITY MODEL CONTENT

[0004] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide an anti-external exudation liquid flow battery electric pile and electrolyte recovery system, which has the advantages of effectively realizing electrolyte leakage collection protection and low cost.

[0005] The purpose of the utility model is achieved by adopting the following technical solutions:

[0006] According to the first aspect of the embodiment of the present disclosure, an anti-external exudation liquid flow battery electric pile is provided, which comprises:

[0007] A plate frame for loading electrode is formed with a reaction zone inside, and a sealing groove is provided on the side of the plate frame close to the electrode near the reaction zone, the sealing groove is used to embed a sealing element to form a sealing area, the outer periphery of the sealing area is provided with a buffer flow guide groove, a flow guide channel is formed between the buffer flow guide groove and the sealing groove, and a plurality of drainage grooves are provided on the bottom of one side surface of the plate frame and communicated with the buffer flow guide groove, the drainage grooves are used to guide and discharge the leaked electrolyte; and

[0008] A liquid receiving tray is provided with liquid receiving openings corresponding to the flow grooves, and a liquid storage cavity is formed in the liquid receiving tray to store the leaked liquid.

[0009] The battery stack is usually in a vertical state during operation. After the electrolyte enters the battery stack, it combines with the electrode in the reaction zone to perform electrolysis. Since the electrolyte converges in the reaction zone, the plate frame is the most prone to electrolyte leakage. In the normal state, the electrolyte is sealed in the reaction zone by the sealing member. When the sealing member deforms due to aging after long-term operation, a small amount of electrolyte will leak out of the sealing zone. Then, the electrolyte will enter the buffer flow channel under the action of gravity and eventually flow out of the flow groove. The leaked electrolyte is collected and temporarily stored in the liquid receiving tray through the liquid receiving opening, thereby avoiding corrosion and damage to the battery stack caused by electrolyte leakage outside the battery stack. The leaked electrolyte is not contaminated and can be effectively recycled. Since the electrolyte is drained from the outer periphery of the sealing groove, the sealing of the battery stack itself is not affected, and the structural strength of the plate frame is not affected. No additional auxiliary structures or equipment are needed, the structure is simpler and the cost is lower. Since the buffer flow channel does not have a sealing structure, there is no air blockage when the electrolyte is drained. The leaked electrolyte from the battery stack can flow smoothly and achieve good flow effect.

[0010] In some example embodiments, the battery stack is carried on a stack support, and the stack support is provided with an insertion frame at the bottom of the battery stack for inserting the liquid receiving tray.

[0011] The above technical solution is implemented to install the battery stack and the liquid receiving tray.

[0012] In some example embodiments, the bottom of the liquid receiving tray is provided with a liquid outlet portion connected to a collection device.

[0013] The above technical solution can better achieve the recycling of electrolyte.

[0014] In some example embodiments, the liquid outlet portion is funnel-shaped.

[0015] The funnel-shaped design can make it easier for electrolyte to drain.

[0016] In some example embodiments, the collection device includes:

[0017] A transfer liquid storage tank is connected to the liquid outlet portion through a first collection pipe, and the end of the first collection pipe is located near the top of the transfer liquid storage tank.

[0018] A collecting pump is connected to the intermediate liquid storage tank through a second collecting pipe, and a first end of the second collecting pipe extends to a bottom of the intermediate liquid storage tank.

[0019] According to the technical scheme, after the electrolyte enters the liquid receiving disc, the electrolyte is stored in the liquid storage tank through the first collecting pipe, and when the collecting pump is started, the electrolyte can be drained to the battery system for recycling through the second collecting pipe.

[0020] According to a second aspect of the embodiments of the present disclosure, an electrolyte recycling system is provided, comprising:

[0021] The anti-liquid leakage flow battery stack of the first aspect; and

[0022] A liquid storage tank for storing positive electrolyte or negative electrolyte, and a second end of the second collecting pipe is connected to a liquid inlet of the liquid storage tank.

[0023] According to the technical scheme, the leaked electrolyte can be recycled and sent back to the liquid storage tank.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] The utility model discloses an anti -exudation liquid flow battery electric pile and electrolyte recovery system, wherein, the anti -exudation liquid flow battery electric pile includes: the plate frame for loading electrode, form the reaction zone in the plate frame, the side of plate frame close to electrode is located close reaction zone and is equipped with sealing groove, the sealing groove is used for embedding the sealing element to form the sealed area, the outer periphery of sealed area is equipped with the buffer flow guide groove, the buffer flow guide groove forms the flow guide channel with sealing groove, the one side surface bottom of plate frame is equipped with a plurality of with buffer flow guide groove intercommunication's flow outlet, and the flow outlet is used for draining the electrolyte that leaks and leads out, and, the liquid receiving tray is equipped with the liquid receiving port for corresponding with the flow outlet in the liquid receiving tray, and forms the liquid storage cavity for storing the leakage in the liquid receiving tray. The battery electric pile is in the vertical state usually when working, and the electrolyte combines with the electrode in the reaction zone and carries out electrolysis reaction after entering the battery electric pile, because the electrolyte will converge in the reaction zone, therefore, in the normal state, the electrolyte is sealed in the reaction zone by the sealing element, when the sealing element appears aging deformation after long -term operation, a small amount of electrolyte will leak from the sealed area, and then will enter the buffer flow guide groove through the flow guide channel, and flows down along the buffer flow guide groove and finally flows out from the flow outlet, and is collected and stored in the liquid receiving tray through the liquid receiving port, thereby avoiding that the electrolyte leaks to the outside of battery electric pile and causes corrosion damage to battery electric pile, and the leaked electrolyte can not be polluted and can be recycled effectively, and because the electrolyte is drained by the outer periphery of sealing groove, the sealing property of battery electric pile itself will not be affected, and the structural strength of plate frame will not be affected, and other auxiliary structures and equipment do not need to be additionally increased, and the structure design is simpler, and the cost is lower, and simultaneously because the buffer flow guide groove does not have sealing structure, therefore, when the electrolyte that leaks flows, the gas block phenomenon will not appear, and the electrolyte that leaks from the inside of battery electric pile can enter smoothly, and the flow guide effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the structure schematic diagram of the anti -exudation liquid flow battery electric pile of the utility model embodiment one.

[0027] Figure 2 It is the connection structure schematic diagram of plate frame and liquid receiving tray in the utility model embodiment one.

[0028] Figure 3 It is the structure schematic diagram of the anti -exudation liquid flow battery electric pile of the utility model embodiment two.

[0029] Figure 4 It is the structure schematic diagram of the electrolyte recovery system of the utility model embodiment three.

[0030] The corresponding component name represented by the figure number and letter:

[0031] 10, plate frame; 11, reaction zone; 12, sealing groove; 13, buffer flow guide groove; 14, drainage groove; 15, battery stack support; 16, insertion frame; 20, liquid receiving tray; 21, liquid receiving port; 22, liquid storage cavity; 23, liquid outlet; 30, collection device; 31, transfer liquid storage tank; 32, first collection pipe; 33, collection pump; 34, second collection pipe; 40, battery stack; 50, liquid storage tank. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] Embodiment one

[0034] As shown in Figure 1 and Figure 2 , the present embodiment provides an anti-external-exudation liquid flow battery stack, comprising: a plate frame 10 for loading electrodes, a reaction zone 11 is formed in the plate frame 10, a sealing groove 12 is arranged on the side of the plate frame 10 close to the electrodes and located close to the reaction zone 11, the sealing groove 12 is used for embedding a sealing member to form a sealed area, a buffer flow guide groove 13 is arranged on the outer periphery of the sealed area, a flow guide channel is formed between the buffer flow guide groove 13 and the sealing groove 12, a plurality of drainage grooves 14 are arranged on the bottom of the surface of one side of the plate frame 10 and communicated with the buffer flow guide groove 13, the drainage grooves 14 are used for guiding and discharging the leaked electrolyte; and a liquid receiving tray 20, the liquid receiving tray 20 is provided with a liquid receiving port 21 corresponding to the drainage groove 14, and a liquid storage cavity 22 for storing the leaked liquid is formed in the liquid receiving tray 20.

[0035] It can be understood that the plate frame 10 is one of the parts in the battery stack 40, usually a single cell in the battery stack 40 is formed into an integrated plate by two plate frames 10 clamping a bipolar plate, the battery stack 40 is stacked in the order of integrated plate, carbon felt electrode, proton membrane, carbon felt electrode, integrated plate and then locked and formed, the sealing member adopts a sealing ring, and in some embodiments, the sealing groove 12 can also be formed between the plate frame 10 and the bipolar plate, the carbon felt electrode is arranged in the integrated plate during installation, the proton membrane can also be sealed and fixed by the sealing member, the battery stack 40 is prevented in a vertical state after assembly, at this time the plate frame 10 forms an upper and lower structure, and the drainage groove 14 is located below; a plurality of single cells are stacked and end plates are arranged on the outer sides of the single cells to form a battery stack.

[0036] The outer side of the sealing groove 12 is a non-sealing area, the buffer flow guide groove 13 is located in the non-sealing area, and a flow guide channel is formed between the sealing groove 12 and the buffer flow guide groove 13 through material deformation. At this time, the leaked electrolyte can bypass the sealing member and enter the buffer flow guide groove 13 through the flow guide channel. The buffer flow guide groove 13 forms a cheek pouch area for buffering the leaked electrolyte, which then flows out through the drainage groove 14 located at the bottom. It can be understood that the drainage groove 13 does not penetrate the plate frame 10.

[0037] The battery stack 40 is carried on a stack support 15. The stack support 15 is provided with an insertion frame 16 for inserting the liquid receiving disc 20 at the bottom of the battery stack 40. The stack support 15 is provided to install the battery stack 40 and the liquid receiving disc 20. The top of the stack support 15 is provided with a slot corresponding to the drainage groove 14 for the electrolyte to pass through. The insertion frame 16 can insert or extract the liquid receiving disc 20, making the installation and removal process more convenient.

[0038] In some embodiments, the drainage groove 14 is provided as 3-5, and the liquid receiving disc 20 is usually provided as a disc body with an open top. The liquid receiving port 21 is the top opening. Of course, the top of the liquid receiving disc 20 can be provided as a closed top plate, and a plurality of hole-shaped or strip-shaped liquid receiving ports 21 are provided on the top plate corresponding to each drainage groove 14.

[0039] The battery stack 40 is usually in a vertical state during operation. After the electrolyte enters the battery stack 40, it combines with the electrode in the reaction area 11 to perform electrolysis reaction. Since the electrolyte converges in the reaction area 11, the plate frame 10 is the most prone to electrolyte leakage. Under normal conditions, the electrolyte is sealed in the reaction area 11 by the sealing member. When the sealing member deforms due to aging after long-term operation, a small amount of electrolyte will leak from the sealing area. Subsequently, it will enter the buffer flow guide groove 13 through the flow guide channel, flow downward along the buffer flow guide groove 13 under the action of gravity, and finally flow out from the drainage groove 14. The leaked electrolyte enters the liquid receiving disc 20 through the liquid receiving port 21 and is collected and temporarily stored, thereby avoiding corrosion and damage to the battery stack 40 caused by electrolyte leakage outside the battery stack 40. The leaked electrolyte will not be contaminated and can be effectively recycled. Since the electrolyte is drained from the outer periphery of the sealing groove 12, it will not affect the sealing of the battery stack 40 itself and will not affect the structural strength of the plate frame 10. No additional auxiliary structures and equipment are required, the structure is simpler and the cost is lower. Since there is no sealing structure in the buffer flow guide groove 13, there is no air blockage phenomenon when the leaked electrolyte is guided. The leaked electrolyte from the inside of the battery stack 40 can flow smoothly, achieving a better flow guiding effect.

[0040] Embodiment Two

[0041] As Figure 3As shown in the utility model embodiment, the anti-liquid leakage flow battery stack 40 is different from the embodiment one in that: in the embodiment, the bottom of the liquid receiving tray 20 is provided with a liquid outlet 24, the liquid outlet 24 is connected with the collecting device 30, so that the circulation use of the electrolyte can be better realized, preferably, the liquid outlet 24 is funnel-shaped, and through the funnel-shaped design, the electrolyte can be more easily discharged.

[0042] The collecting device 30 comprises: a transfer liquid tank 31, the transfer liquid tank 31 is communicated with the liquid outlet 24 through a first collecting pipe 32, the end of the first collecting pipe 32 is arranged close to the top of the transfer liquid tank 31; a collecting pump 33, the collecting pump 33 is communicated with the transfer liquid tank 31 through a second collecting pipe 34, the first end of the second collecting pipe 34 extends to the bottom of the transfer liquid tank 31. In some embodiments, a one-way valve can also be arranged on the second collecting pipe 34 to limit the electrolyte to flow out of the transfer liquid tank 31 only, after the electrolyte enters the liquid receiving tray 20, is stored in the liquid tank through the first collecting pipe 32, and the collecting pump 33 is started, the electrolyte can be drained to the battery system through the second collecting pipe 34 for recycling.

[0043] Embodiment three

[0044] As Figure 4 shown, the utility model embodiment provides an electrolyte recycling system, which comprises: the anti-liquid leakage flow battery stack as described in the embodiment two; and a liquid tank 50 for storing positive electrolyte or negative electrolyte, the second end of the second collecting pipe 34 is connected to the liquid inlet of the liquid tank 50, so that the leaked electrolyte can be returned to the liquid tank 50 for recycling. It can be understood that the battery stack 40 is respectively arranged corresponding to the positive liquid tank 50 and the negative liquid tank 50.

[0045] The above embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of deformations and improvements and evolutions can be made, which are equivalent modifications and evolutions of the above embodiments according to the essential technology of the utility model, and these all belong to the protection range of the utility model.

Claims

1. A battery stack designed to prevent external leakage of liquid flow, characterized in that, include: A plate frame for mounting electrodes, wherein a reaction zone is formed within the plate frame, and a sealing groove is provided on the side of the plate frame closest to the electrodes near the reaction zone, the sealing groove being used to embed a sealing element to form a sealing zone, a buffer channel is provided on the outer periphery of the sealing zone, the buffer channel forming a flow channel with the sealing groove, and a plurality of drain channels connected to the buffer channel are provided on the bottom of one side surface of the plate frame, the drain channels being used to drain leaked electrolyte; and, The liquid receiving tray is provided with a liquid receiving port corresponding to the drain channel, and a liquid storage cavity is formed inside the liquid receiving tray for storing the leaked liquid.

2. The anti-leakage battery stack according to claim 1, characterized in that, The battery stack is supported by a stack support, and the stack support has a frame at the bottom of the battery stack for inserting a liquid receiving tray.

3. The anti-leakage battery stack according to claim 1, characterized in that, The bottom of the receiving tray is provided with a liquid outlet, which is connected to the collection device.

4. The anti-leakage battery stack according to claim 3, characterized in that, The liquid outlet is funnel-shaped.

5. The anti-leakage battery stack according to claim 3, characterized in that, The collection device includes: A transfer storage tank is provided, which is connected to the outlet section via a first collection pipe, the end of which is located near the top of the transfer storage tank. A collection pump is connected to the transfer storage tank via a second collection pipe, the first end of which extends to the bottom of the transfer storage tank.

6. An electrolyte recovery system, characterized in that, include: The anti-leakage battery stack as described in claim 5; as well as, A storage tank for storing positive or negative electrolyte, wherein the second end of the second collecting tube is connected to the inlet of the storage tank.

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