Alkaline electrolytic cell with backflow temperature equalizing structure

Abstract

The invention discloses an alkaline electrolytic bath with a backflow temperature equalizing structure. The alkaline electrolytic bath comprises an electrolytic bath body and a backflow temperature equalizing assembly. The electrolytic cell body comprises bipolar plates, a pole frame and an electrolyte inlet and outlet, electrolyte flows in the inlet and outlet direction, and the bipolar plates are oppositely arranged to define a small electrolytic chamber. A backflow channel is formed in the backflow temperature equalizing assembly, one end of the channel is connected with the electrolyte outlet, and the other end of the channel extends to the inlet area. A flow guide structure is arranged at the electrolyte inlet, at least two flow dividing channels can be divided, the flow dividing channels comprise a low-temperature channel communicated with the inlet and a high-temperature channel communicated with the backflow channel, and the flow guide structure guides electrolyte in the two channels to be mixed and then flow into the small electrolysis chamber. An internal circulation channel is constructed through the backflow temperature equalizing assembly, heat of high-temperature electrolyte at an outlet is recycled, and the problem that the temperature in small electrolysis chambers and the temperature between the small chambers are not uniform due to one-way flowing of electrolyte in a traditional alkaline electrolytic cell is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of alkaline electrolyzer, in particular, to an alkaline electrolyzer with a backflow temperature equalization structure. Especially, a closed-loop backflow temperature equalization type bipolar plate and electrolyzer. BACKGROUND

[0002] In the development process of alkaline electrolyzer towards large-scale and high current density, the heat generated by the electrochemical reaction in the electrolysis unit is concentrated, which is prone to temperature unevenness, and further leads to electrolyte concentration imbalance, accelerated electrode corrosion and risk of sealing failure, therefore, the temperature distribution needs to be improved through structural optimization. There are various technical solutions in the prior art for temperature control of alkaline electrolyzer, as follows:

[0003] Patent document CN118932370A discloses an alkaline water electrolysis bipolar plate, an electrolysis unit, an electrolyzer and a hydrogen production system, which sets a cooling cavity in the main bipolar plate, and forms a cooling loop by introducing cooling liquid into the cooling liquid channel, and at the same time, a water supplement device is used to supplement deionized water, trying to achieve temperature control of the electrolysis unit by cooling cavity cooling to improve the problem of temperature unevenness.

[0004] Patent document CN118685803B discloses a flow channel structure of an alkaline electrolyzer and an alkaline electrolyzer, which includes a bipolar plate body, the bipolar plate body is provided with an inlet end and an outlet end, and is provided with point-shaped turbulence structure units, which are further divided into three levels, and form a shunt flow channel on the bipolar plate body. The patent solution lacks effective backflow guide and mixing structure, and is prone to problems such as poor flow of backflow liquid and low mixing efficiency with inlet liquid, which further aggravates temperature imbalance. At the same time, due to the lack of physical isolation and directional guidance design, the backflow liquid and the inlet liquid may mix in advance, which has potential risk of cross reaction gas, affecting the purity of the gas.

[0005] Therefore, the prior art has the following disadvantages: (1) Temperature regulation depends on external cooling liquid system, which does not utilize the heat of high-temperature electrolyte at the outlet, and there is obvious energy waste, and when the large electrolyzer is stacked, the heat exchange of the middle electrolysis unit lags behind, and the overall temperature balance cannot be achieved from the inlet source; (2) The cooling cavity is integrated in the main bipolar plate, which is prone to interfere with the local temperature of the reaction flow field through heat conduction, and the processing and assembly process of the cooling cavity is complex, which significantly increases the manufacturing cost; (3) Lack of targeted electrolyte backflow structure, resulting in large temperature difference between the inlet and outlet, poor temperature balance; (4) Additional cooling liquid circulating pump, temperature control module and other auxiliary equipment are needed, which not only increases the system volume and operating energy consumption, but also reduces the applicability and economy of the equipment. SUMMARY

[0006] In view of the defects in the prior art, the purpose of the present application is to provide an alkaline electrolyzer with a backflow temperature equalization structure.

[0007] According to the application, a basic electrolytic cell with a backflow temperature equalization structure is provided, comprising an electrolytic cell body and a backflow temperature equalization assembly. The electrolytic cell body comprises bipolar plates and pole frames, the bipolar plates are arranged opposite to each other on both sides of the pole frames in the axial direction, and an electrolytic chamber is formed. The pole frame is provided with a hollow electrolyte inlet and an electrolyte outlet, the electrolyte inlet and the electrolyte outlet are arranged at the two ends of the electrolytic chamber in the radial direction, and the flow direction of the electrolyte is formed along the radial direction from the electrolyte inlet to the electrolyte outlet. The backflow temperature equalization assembly is arranged on the electrolytic cell body and avoids the reaction area of the electrolytic chamber, an internal backflow channel is formed in the backflow temperature equalization assembly, and the two ends of the backflow channel are respectively communicated with the electrolyte inlet and the electrolyte outlet. The end of the backflow temperature equalization assembly close to the electrolyte inlet side is provided with a flow guide structure, the flow guide structure separates the electrolyte inlet area to form at least two shunt channels, the shunt channels include a low-temperature channel communicated with the electrolyte inlet and a high-temperature channel communicated with the backflow channel, and the flow guide structure can guide the low-temperature electrolyte in the low-temperature channel to mix with the high-temperature backflow electrolyte in the high-temperature channel and then flow into the electrolytic chamber.

[0008] Preferably, the backflow temperature equalization assembly is integrated in the interior of the pole frame or the edge area of the bipolar plate, so that the backflow channel is arranged on the radial outer side of the electrolytic chamber and is separated from the electrolytic chamber.

[0009] Preferably, an annular hollow groove is formed in the pole frame, the hollow groove is communicated with the electrolyte inlet and the electrolyte outlet, the hollow groove separates the pole frame into an inner ring and an outer ring, and the backflow channel is formed in the hollow groove.

[0010] Preferably, the flow guide structure comprises a vertical baffle and an L-shaped baffle, the L-shaped baffle comprises a longitudinal portion and a transverse portion. The vertical baffle and the longitudinal portion of the L-shaped baffle both extend parallel to the radial direction of the pole frame, and the longitudinal portion and the vertical baffle are aligned perpendicular to the radial direction, the transverse portion of the L-shaped baffle extends perpendicular to the radial direction of the pole frame, and is sealingly connected to the end of the inner ring close to the electrolyte inlet.

[0011] Preferably, the flow guide structure separates the electrolyte inlet area to form three shunt channels, i.e., a left channel, a middle channel and a right channel. The middle channel is formed between the longitudinal portion of the L-shaped baffle and the vertical baffle, one end of the middle channel is connected to the backflow channel, and the other end of the middle channel extends to the inlet of the electrolytic chamber. The left channel and the right channel are respectively formed on the side of the vertical baffle and the longitudinal portion of the L-shaped baffle away from the middle channel. The left channel and the right channel are the low-temperature channels, and the middle channel is the high-temperature channel.

[0012] Preferably, the left channel and the right channel are in communication with an external electrolyte supply system.

[0013] Preferably, the flow guide structure further comprises an arc-shaped baffle fixedly arranged in the hollow groove, the arc-shaped baffle comprising an arc-shaped inner baffle and an arc-shaped outer baffle, and the arc-shaped inner baffle and the arc-shaped outer baffle forming the backflow channel therebetween.

[0014] Preferably, a radially inner side of the arc-shaped inner baffle is fixedly connected to and tightly fitted with a radially outer side of the inner ring, and a radially outer side of the arc-shaped outer baffle is fixedly connected to and tightly fitted with a radially inner side of the outer ring. An end of the arc-shaped inner baffle close to the electrolyte inlet extends in parallel to the horizontal part of the L-shaped baffle and is fixedly connected to and tightly fitted with the horizontal part of the L-shaped baffle. An end of the arc-shaped outer baffle close to the electrolyte inlet extends in parallel to the vertical baffle and is fixedly connected to and tightly fitted with the vertical baffle, and the two ends form the middle channel therebetween.

[0015] Preferably, the hollow groove and the backflow temperature equalization assembly are symmetrically arranged on both sides of the electrolytic cell body, and form a common middle channel at the electrolyte inlet.

[0016] Preferably, the electrolytic cell body and the corresponding backflow temperature equalization assembly form a group of electrolytic units, the alkaline electrolytic cell comprises a plurality of groups of electrolytic units arranged along an axial direction, the electrolyte inlets and the electrolyte outlets on the polar frames of adjacent electrolytic units are in communication with each other, and the backflow channels are separated from each other.

[0017] Compared with the prior art, the present application has the following beneficial effects: 1. The present application constructs the internal circulation channels of the main reaction flow field and the backflow temperature equalization flow field through the backflow temperature equalization assembly with the backflow channel, realizes the recycling of the heat of the high-temperature electrolyte at the outlet, and effectively improves the problem of uneven temperature distribution in the electrolytic cells and between the electrolytic cells caused by the unidirectional flow of the electrolyte in the traditional alkaline electrolytic cell.

[0018] 2. The present application solves the problem of too large temperature gradient at the inlet area of the electrolytic cell caused by the poor flow of the backflow liquid and the low mixing efficiency of the inlet liquid through the three-channel shunt design of the inlet baffle group and the use of the traction effect caused by the high-speed flow of the electrolyte at the two sides to drive the smooth flow and full mixing of the high-temperature backflow electrolyte in the middle channel, thereby improving the temperature balance in the cell.

[0019] 3. The present invention forms physical isolation and directional guidance at the outlet end of the intermediate channel and the reflux channel by means of an arc-shaped baffle. While achieving efficient temperature mixing and circulation, it effectively blocks the pre-mixing path of the high-temperature reflux electrolyte and the low-temperature electrolyte in the inlet manifold, avoids the potential risk of cross-contamination of reaction gases, and ensures the purity of reaction gases. Attached Figure Description

[0020] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a top view illustrating the structure of the alkaline electrolytic cell, which is the main feature of this invention. Figure 2 This is a perspective view illustrating the structure of the alkaline electrolytic cell, which is the main feature of this invention. Figure 3 This is a top view of the arc-shaped baffle structure, which is the main feature of this invention. Figure 4 This invention primarily demonstrates the simulation cloud map of the electrolyte flow velocity distribution within an alkaline electrolytic cell.

[0021] Figure label: Detailed Implementation

[0022] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0023] This embodiment addresses the issue of uneven temperature caused by electrochemical reactions within an alkaline electrolyzer. Based on the operating conditions of an alkaline electrolyzer with a working voltage of 1.8V and an electrolyte flow rate of 0.1m / s in the inlet manifold, computational fluid dynamics (CFD) simulation was used to conduct an in-depth study of its internal flow field characteristics and the principle of reflux temperature equalization.

[0024] The alkaline electrolyzer used in this embodiment includes an electrolyzer body and a reflux temperature equalization component, such as... Figure 1 and Figure 2 As shown, the electrolytic cell body includes bipolar plates and an electrode frame 9. The bipolar plates are arranged opposite each other on both sides of the electrode frame 9, forming an electrolytic chamber 10 between them. The electrode frame 9 is provided with a hollowed-out electrolyte inlet 71 and an electrolyte outlet 72, which are located at both ends of the electrolytic chamber 10 in the radial direction. The flow direction of the electrolyte is formed radially from the electrolyte inlet 71 to the electrolyte outlet 72.

[0025] The core of this embodiment is to add a reflux temperature equalization component in the electrolytic cell. The electrolytic cell body and the corresponding reflux temperature equalization component form a set of electrolytic units. The alkaline electrolytic cell may include multiple sets of electrolytic units arranged along the axial direction. The electrolyte inlet 71 and electrolyte outlet 72 on the electrode frame 9 of adjacent electrolytic units are interconnected, and the reflux channels 6 are separated from each other.

[0026] The reflux equalization temperature assembly is located within the electrolytic cell body but avoids the reaction zone of the electrolysis chamber 10, ensuring no interference with the electrolysis reaction area. A reflux channel 6 is formed inside the reflux equalization temperature assembly, with its two ends connected to the electrolyte inlet 71 and electrolyte outlet 72, respectively. The reflux equalization temperature assembly can be integrated either inside the electrode frame 9 of the electrolytic cell or into the edge region of the bipolar plate, allowing the reflux channel 6 to be arranged radially outside the electrolysis chamber 10 and separated from it. Ultimately, this forms a temperature-equilibrium circulation channel structure within the electrolytic cell, integrating the main reaction flow field and the reflux equalization temperature flow field. Since there is no need to process a cooling cavity inside the main electrode plate, this simplifies the electrolytic cell's processing and assembly, reduces manufacturing costs, and avoids localized interference of the reaction flow field caused by heat conduction from the cooling cavity. Meanwhile, the internal reflux temperature equalization structure can achieve self-balance of the tank temperature without relying on external coolant systems and supporting auxiliary equipment such as circulating pumps and temperature control modules. It can recover and utilize the waste heat of high-temperature electrolyte, effectively reducing system operating energy consumption and overall volume, and improving the applicability and economy of the equipment.

[0027] The bipolar plate is located inside the electrode frame 9 and has a circular structure. The inlet of the electrolysis chamber 10 is connected to the confluence of the left channel 3, the middle channel 4, and the right channel 5, and the outlet of the electrolysis chamber 10 is connected to the electrolyte outlet 72, thus establishing... Figure 1 The main flow direction of the electrolyte within the electrolysis unit is "bottom in, top out". For example... Figure 1 As shown, an annular perforated groove 11 is formed on the electrode frame 9. The perforated groove 11 connects the electrolyte inlet 71 and the electrolyte outlet 72, dividing the electrode frame 9 into an inner ring 91 and an outer ring 92. The inner ring 91 is located radially inside the perforated groove 11, and the outer ring 92 is located radially outside the perforated groove 11. A reflux channel 6 is formed within the perforated groove 11. It is worth noting that the perforated groove 11 and the reflux equalization component can be symmetrically arranged on both sides of the electrolytic cell body, forming a shared intermediate channel 4 at the electrolyte inlet 71. The reflux channel 6 is annular and arranged radially outside the electrolytic chamber 10, separated from the electrolytic chamber 10, and not connected to the reaction zone of the electrolytic chamber 10.

[0028] The reflux equalization assembly has a flow guiding structure at its end near the electrolyte inlet 71. This flow guiding structure is an inlet baffle assembly adapted to the electrolyte inlet 71, including a vertical baffle 1, an L-shaped baffle 2, and an arc-shaped baffle 8. The entire inlet baffle assembly is fixed inside the electrode frame 9 of the electrolytic cell. The L-shaped baffle 2 includes a longitudinal portion 21 and a transverse portion 22. Both the vertical baffle 1 and the longitudinal portion 21 of the L-shaped baffle 2 extend parallel to the radial direction of the electrode frame 9, and the longitudinal portion 21 and the vertical baffle 1 are aligned perpendicularly to the radial direction. The transverse portion 22 of the L-shaped baffle 2 extends perpendicularly to the radial direction of the electrode frame 9 and is sealed to the end of the inner ring 91 near the electrolyte inlet 71.

[0029] The baffle assembly divides the electrolyte inlet 71 area into three diversion channels: a left channel 3, a middle channel 4, and a right channel 5. Specifically, the middle channel 4 is formed between the longitudinal portion 21 of the L-shaped baffle 2 and the vertical baffle 1. The left channel 3 and the right channel 5 are formed on opposite sides of the vertical baffle 1 and the L-shaped baffle 2, respectively, away from the middle channel 4. The left channel 3 and the right channel 5 are low-temperature channels connected to the electrolyte inlet 71, while the middle channel 4 is a high-temperature channel connected to the return channel 6. The left channel 3 and the right channel 5 are connected to an external electrolyte supply system, allowing the low-temperature inlet electrolyte to enter at high speed. One end of the middle channel 4 is connected to the return channel 6, and the other end extends to the inlet of the electrolysis chamber 10. This design utilizes the traction effect generated by the high-speed flow of low-temperature inlet electrolyte on both sides to drive the smooth flow and thorough mixing of high-temperature reflux electrolyte in the middle channel. This solves the problem of excessive temperature gradient in the inlet area of ​​the electrolysis chamber caused by poor reflux flow and low mixing efficiency with the inlet electrolyte, thereby improving the temperature uniformity within the tank.

[0030] An arc-shaped baffle 8 is fixedly installed within the hollow groove 11, including an arc-shaped inner baffle 81 located radially inward and an arc-shaped outer baffle 82 located radially outward, forming a return channel 6 between the arc-shaped inner baffle 81 and the arc-shaped outer baffle 82. The radially inner side of the arc-shaped inner baffle 81 is fixedly connected to the radially outer side of the inner ring 91 and fits tightly. Its end near the electrolyte inlet 71 extends parallel to the transverse portion 22 of the L-shaped baffle 2 and is fixedly connected to and fits tightly with the transverse portion 22. The radially outer side of the arc-shaped outer baffle 82 is fixedly connected to the radially inner side of the outer ring 92 and fits tightly. Its end near the electrolyte inlet 71 extends parallel to the vertical baffle 1 and is fixedly connected to and fits tightly with the vertical baffle 1, forming an intermediate channel 4 between the two ends. With the above structure, the end of the arc-shaped baffle 8 near the electrolyte inlet 71 serves as the connection point between the intermediate channel 4 and the reflux channel 6, enabling the high-temperature electrolyte in the reflux channel 6 to be directed to the intermediate channel 4. Simultaneously, it provides physical isolation and directional guidance at the outlet ends of the intermediate channel 4 and the reflux channel 6, achieving efficient temperature mixing of the reflux electrolyte with the newly entered low-temperature electrolyte in the electrolysis chamber 10 while effectively preventing premature mixing of the high-temperature reflux electrolyte with the low-temperature electrolyte in the inlet manifold, avoiding potential cross-contamination risks of reactive gases and ensuring the purity of the reactive gases. Furthermore, the distance between the vertical baffle 1 and the longitudinal portion 21 of the L-shaped baffle 2 is equal to the width of the reflux channel 6 outlet cross-section, ensuring a stable flow rate of the high-temperature reflux electrolyte in the intermediate channel 4. The arc-shaped baffle 8 is installed near the end of the electrolyte inlet 71 and has a transition design that narrows from wide to narrow. This design not only provides space for the connection pipe between the right channel 5 and the external electrolyte supply device, but also accelerates the flow rate of the high-temperature reflux electrolyte when it enters the middle channel 4, thereby improving the mixing efficiency of the high and low temperature electrolytes.

[0031] The key velocity distribution cloud map clearly shows the flow structure in the inlet region: the three independent channels formed by the above-mentioned baffle group form a stable flow field. Figure 4 Simulation results show that the average flow velocity of the electrolyte from the reflux channel 6 in the middle channel 4 reaches 0.03 m / s, ensuring that the high-temperature reflux liquid can be quickly carried into the downstream mixing zone, avoiding local stagnation or heat accumulation. The core working principle of this embodiment is closed-loop circulating temperature equalization, and the specific process is as follows: The external low-temperature electrolyte first enters the electrolytic cell body from the electrolyte inlet 71, flows through the three-channel area formed by the inlet baffle group, and the high-speed low-temperature electrolyte in the left channel 3 and right channel 5 uses its flow traction effect to drive the high-temperature reflux electrolyte in the middle channel 4 to flow smoothly and mix fully, and the two achieve temperature equalization at the inlet end.

[0032] The mixed electrolyte enters the electrolysis chamber 10 enclosed by circular bipolar plates for an electrochemical reaction. The heat generated by the reaction raises the temperature of the electrolyte flowing through it. The reacted electrolyte flows out from the electrolyte outlet 72 at the radial end of the electrolysis chamber 10. A portion enters the subsequent gas-liquid separation system, while the other portion flows naturally into the reflux channel 6, which surrounds the outer periphery of the electrolysis chamber 10 and is located radially outside it. The high-temperature electrolyte is guided back to the inlet area via the reflux channel 6 and, under the directional guidance of the arc-shaped baffle 8, is reinjected into the intermediate channel 4, forming a closed-loop flow path of "electrolyte inlet 71 - three-channel mixing - electrolysis reaction - electrolyte outlet 72 - reflux channel 6 - intermediate channel 4," constituting the working principle of the reflux equalization component.

[0033] This closed-loop flow path design, combined with the stable flow field structure formed at the inlet and the resulting effective traction, optimizes the overall flow characteristics inside the electrolyzer. It can balance the overall temperature of the electrolyzer from the inlet source, solve the problem of heat exchange lag in the middle electrolysis unit when large electrolyzers are stacked, adapt to the development needs of large-scale electrolyzers and high current density, and ensure the long-term operation of the equipment.

[0034] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "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 this application 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 this application.

[0035] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. An alkaline electrolytic cell with a reflux temperature equalization structure, characterized in that, include: Electrolytic cell body and reflux isotherm assembly; The electrolytic cell body includes bipolar plates and an electrode frame (9). The bipolar plates are arranged opposite each other on both sides of the electrode frame (9) to form an electrolytic chamber (10). The electrode frame (9) is provided with a hollowed-out electrolyte inlet (71) and electrolyte outlet (72). The electrolyte inlet (71) and electrolyte outlet (72) are located at both ends of the electrolysis chamber (10) in the radial direction. The flow direction of the electrolyte is formed radially from the electrolyte inlet (71) to the electrolyte outlet (72). The reflux temperature equalization component is disposed on the electrolytic cell body and avoids the reaction zone of the electrolysis chamber (10). A reflux channel (6) is formed inside the reflux temperature equalization component. The two ends of the reflux channel (6) are respectively connected to the electrolyte inlet (71) and the electrolyte outlet (72). The reflux temperature equalization component has a flow guiding structure at the end near the electrolyte inlet (71). The flow guiding structure divides the electrolyte inlet (71) area into at least two flow channels. The flow channels include a low-temperature channel connected to the electrolyte inlet (71) and a high-temperature channel connected to the reflux channel (6). The flow guiding structure can guide the low-temperature electrolyte in the low-temperature channel to mix with the high-temperature reflux electrolyte in the high-temperature channel and then flow into the electrolysis chamber (10).

2. The alkaline electrolytic cell with a reflux temperature equalization structure as described in claim 1, characterized in that, The reflux temperature equalization component is integrated inside the electrode frame (9) or the edge area of ​​the bipolar plate, such that the reflux channel (6) is arranged radially outside the electrolysis chamber (10) and separated from the electrolysis chamber (10).

3. The alkaline electrolytic cell with a reflux temperature equalization structure as described in claim 2, characterized in that, The electrode frame (9) has an annular hollow groove (11) that connects the electrolyte inlet (71) and the electrolyte outlet (72). The hollow groove (11) divides the electrode frame (9) into an inner ring (91) and an outer ring (92). A return channel (6) is formed in the hollow groove (11).

4. The alkaline electrolytic cell with a reflux temperature equalization structure as described in claim 3, characterized in that, The flow guiding structure includes a vertical baffle (1) and an L-shaped baffle (2), the L-shaped baffle (2) including a longitudinal part (21) and a transverse part (22); The longitudinal portion (21) of both the vertical baffle (1) and the L-shaped baffle (2) is parallel to the radial extension of the pole frame (9), and the longitudinal portion (21) and the vertical baffle (1) are aligned perpendicularly to the radial direction. The transverse portion (22) of the L-shaped baffle (2) is perpendicular to the radial extension of the pole frame (9) and is sealed to the end of the inner ring (91) near the electrolyte inlet (71).

5. The alkaline electrolytic cell with a reflux temperature equalization structure as described in claim 4, characterized in that, The flow guiding structure divides the electrolyte inlet (71) area into three flow channels: the left channel (3), the middle channel (4), and the right channel (5); The intermediate channel (4) is formed between the longitudinal portion (21) of the L-shaped baffle (2) and the vertical baffle (1). One end of the intermediate channel (4) is connected to the return channel (6), and the other end extends to the entrance of the electrolysis chamber (10). The longitudinal portions (21) of the vertical baffle (1) and the L-shaped baffle (2) each form a left channel (3) and a right channel (5) on the side away from the middle channel (4); The left channel (3) and the right channel (5) are the low-temperature channels, and the middle channel (4) is the high-temperature channel.

6. The alkaline electrolytic cell with a reflux temperature equalization structure as described in claim 5, characterized in that, The left channel (3) and the right channel (5) are connected to the external electrolyte supply system.

7. The alkaline electrolytic cell with a reflux temperature equalization structure as described in claim 4, characterized in that, The flow guiding structure also includes an arc-shaped baffle (8), which is fixedly installed in the hollow groove (11). The arc-shaped baffle (8) includes an inner arc-shaped baffle (81) and an outer arc-shaped baffle (82), and the return channel (6) is formed between the inner arc-shaped baffle (81) and the outer arc-shaped baffle (82).

8. The alkaline electrolytic cell with a reflux temperature equalization structure as described in claim 7, characterized in that, The radial inner side of the arc-shaped inner baffle (81) is fixedly connected to the radial outer side of the inner ring (91) and fits tightly together; the radial outer side of the arc-shaped outer baffle (82) is fixedly connected to the radial inner side of the outer ring (92) and fits tightly together. The end of the arc-shaped inner baffle (81) near the electrolyte inlet (71) extends parallel to the transverse portion (22) of the L-shaped baffle (2) and is fixedly connected to and closely fitted with the transverse portion (22); The arc-shaped outer baffle (82) extends parallel to the vertical baffle (1) at the end near the electrolyte inlet (71), and is fixedly connected to and tightly fitted with the vertical baffle (1), forming the intermediate channel (4) between the two ends.

9. The alkaline electrolytic cell with a reflux temperature equalization structure as described in claim 7, characterized in that, The hollowed-out groove (11) and the reflux temperature equalization component are symmetrically arranged on both sides of the electrolytic cell body, forming a common intermediate channel (4) at the electrolyte inlet (71).

10. The alkaline electrolytic cell with a reflux temperature equalization structure as described in claim 1, characterized in that, The electrolytic cell body and the corresponding reflux temperature equalization component form a set of electrolytic units. The alkaline electrolytic cell includes multiple sets of electrolytic units arranged along the axial direction. The electrolyte inlet (71) and electrolyte outlet (72) on the pole frame (9) of adjacent electrolytic units are connected to each other, and the reflux channels (6) are separated from each other.

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