Front structure for preventing micro-channel from being blocked

Abstract

The invention provides a front structure for preventing a micro-channel from being blocked, which is characterized in that before entering an inlet of the micro-channel, all electrolyte passes through a choked flow array formed by a plurality of choked flow cylinders, the electrolyte containing large-particle impurities flows away through branch flow channels, and the electrolyte without impurities or containing small-particle impurities flows away through the micro-channel. According to the front structure for preventing the micro-channel from being blocked, large particles are shunted and turned in advance in front of the inlet of the micro-channel, and it is ensured that fluid entering the micro-channel is free of impurities or only contains tiny impurities, so that it is ensured that the fluid flows smoothly when flowing through the micro-channel, and the blockage of the micro-channel is prevented. Meanwhile, the turbulence intensity of the fluid flowing through the micro-channel is increased after the fluid is disturbed by the cylinder, so that the risk of blockage of the micro-channel can be further reduced.

Description

Technical Field

[0001] The present application belongs to the field of microchannel technology, and in particular, relates to a pre-structure to prevent microchannel blockage. Background Art

[0002] Bipolar stack batteries, especially aluminum silver oxide batteries, need to ensure that the electrolyte is evenly distributed to every part of the electrode during operation. To achieve this goal, an electrolyte distribution channel is usually provided. Because the thickness of the bipolar electrode is usually much smaller than its length and width, its distribution channel usually flows in the gap between the plates that are very close to each other. In addition, the special design of the distribution channel will cause the plate gap flow channel to be divided into different branch flow channels. The cross-sectional dimensions of some branch flow channels are extremely small, ranging from 0.1mm to mm. These microchannels are very easy to be blocked by impurities or particles in the electrolyte, causing some areas of the electrode to fail to work normally, thereby causing the entire battery to fail.

[0003] To prevent the problem of microchannel blockage, the commonly used methods include physical filtration, vibration descaling, improving the fluid flow state (such as increasing the flow rate to achieve self-flushing of the flow channel and increasing the turbulent state), etc.

[0004] China's public patent CN202210681666.2 proposes to control the vibration unit on the outer periphery of the flow channel to vibrate according to the acquired flow channel blockage information, so as to clean the blockage in the flow channel without affecting the inner diameter of the flow channel.

[0005] Chinese patent CN202411055936.4 improves the heat exchange efficiency while preventing the impact of bubble blockage and ensures the stability of the heat exchange efficiency by setting up a first diversion component that performs a preheating function and a second diversion component that includes a guide area, a heat exchange area, and a turbulent flow area.

[0006] China's public patent CN202123369621.1 filters large particles through a filter net, avoiding the occurrence of blockage in the roll membrane flow channel.

[0007] China's public patent CN202420100943.0 uses a heat storage module with a three-dimensional flow channel structure composed of multiple stacked and bonded heat storage membranes, so that when low-concentration gas exhaust flows through the ceramic heat storage bed, it has both vertical and horizontal flow, achieving the anti-blocking effect of the heat storage body and uniform temperature distribution on the cross section.

[0008] Chinese patent CN202420448120.7 achieves self-flushing of the flow channel of the multi-liquid mixing device and prevents blockage of the flow channel by adding guide columns to narrow the flow area of ​​the flow channel and accelerate the flow rate of the solution.

[0009] The anti-clogging devices, structures and methods of the above-mentioned patents all require a large space to be implemented and are difficult to use when the structure size is limited, such as flow in tiny gaps, flow between plates with very close spacing, etc. Summary of the invention

[0010] The present application provides a pre-structure to prevent microchannel clogging, which solves the technical problem that the microchannel is easily clogged by impurities or particles in the electrolyte, causing some areas of the electrode to fail to work normally.

[0011] In order to solve at least one of the above technical problems, the technical solution adopted in this application is:

[0012] A front structure for preventing microchannel blockage includes: before all electrolytes enter the microchannel inlet, they pass through a flow blocking array formed by a plurality of flow blocking cylinders, electrolytes containing large particle impurities flow away through branch channels, and electrolytes without impurities or containing smaller particle impurities flow away through the microchannel.

[0013] Furthermore, all the branch channels and the microchannels are interconnected, and are interconnected with the channel inlet.

[0014] Furthermore, at least two branch flow channels are provided; all the branch flow channels are arranged on both sides of the micro flow channel.

[0015] Furthermore, the cross-sectional width of the branch channel is greater than the cross-sectional width of the microchannel.

[0016] Furthermore, the flow blocking array includes a plurality of cylinders disposed at the entrance of the microchannel and distributed at intervals.

[0017] Furthermore, the number of the cylinders is at least 2.

[0018] Furthermore, the cylinders are arranged close to the microchannel inlet, and all the cylinders have the same diameter.

[0019] Furthermore, the diameter of the cylinder does not exceed 1 / 2 of the width of the microchannel.

[0020] Furthermore, the interval between adjacent cylinders and the interval between the cylinder and the microchannel are both smaller than 1 / 2 of the width of the microchannel.

[0021] Furthermore, the cylinder and the electrolyte distribution plate are integrally formed by injection molding or compression molding.

[0022] A pre-structure for preventing microchannel clogging is designed in the present application. By diverting larger particles in advance in front of the microchannel entrance, it is ensured that the fluid entering the microchannel is free of impurities or contains only tiny impurities, thereby ensuring smooth flow through the microchannel. At the same time, the turbulence intensity of the fluid flowing through the microchannel is increased after the cylindrical disturbance, which can further reduce the risk of microchannel clogging. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the front structure for preventing microchannel clogging in the present application;

[0024] Figure 2 This is an enlarged view of part A in this application.

[0025] In the figure:

[0026] 10. Flow channel inlet 20, microchannel 30, flow blocking array

[0027] 31. Cylinder 40. Branch channel DETAILED DESCRIPTION

[0028] The present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] This embodiment proposes a pre-structure to prevent microchannel clogging, such as Figure 1 As shown, before all electrolytes enter the entrance of the microchannel 20, they enter the channel through the channel entrance 10, and after collision and filtration by the flow blocking array 30 formed by a plurality of flow blocking cylinders 31, the electrolyte containing large particle impurities flows away through the branch channel 40 placed on the side, and the electrolyte without impurities or containing smaller particle impurities flows away through the microchannel 20 directly connected to the channel entrance 10. This structure for controlling the flow diversion is simple as a whole and easy to control. After collision and filtration of large particles in advance, the flow is diverted from the branch channel 40 with a larger diameter and width on the side, and will not enter the microchannel 20 through the restricted area formed by the flow blocking array 30, thereby ensuring that the particles entering the microchannel 20 will not block the channel, thereby improving the fluidity.

[0030] In this embodiment, all branch channels 40 and microchannels 20 are interconnected, and are interconnected with the channel inlet 10 .

[0031] Since the distribution of the electrolyte must be uniform, it is required that the cross-sectional dimensions of each branch channel 40 on the electrolyte distribution plate and the microchannel 20 are different. Therefore, the electrolyte with larger particle impurities cannot enter the microchannel 20, and thus after being diverted by the branch channel 40, the microchannel 20 is prevented from being blocked by the electrolyte.

[0032] In this embodiment, two branch channels 40 are provided, and all the branch channels 40 are arranged on both sides of the microchannel 20. At the same time, the cross-sectional width of the branch channel 40 is required to be greater than the cross-sectional width of the microchannel 20.

[0033] like Figure 2 As shown, the flow blocking array 30 includes a plurality of cylinders 31 arranged at the entrance of the microchannel 20 and distributed at intervals. These cylinders 31 are protruding from the electrolyte distribution plate, and then during processing, the cylinders 31 can be integrally injection molded or molded with the electrolyte distribution plate, so that the strength of the flow blocking cylinders 31 can be ensured. All cylinders 31 are arranged close to the entrance of the microchannel 20, and the diameters of all cylinders 31 are the same. The number of cylinders 31 is at least 2, preferably, there are 3 cylinders 31, one of which is arranged directly opposite to the front of the entrance of the microchannel 20, and the other two are distributed on the side of the entrance of the microchannel 20. These three cylinders 31 form a triangular flow blocking array 30 to block the electrolyte at the entrance of the microchannel 20.

[0034] The flow blocking array 30 can be adjusted according to the direction and cross-sectional size of the microchannel 20, including the distance between the flow blocking array 30 and the entrance of the microchannel 30, the arrangement, spacing, and size of the cylinders 31, etc. The triangular flow blocking array 30 formed by the spaced-apart microcylinders 31 can change the flow direction of the impurity particles and also produce a turbulent effect on the micro electrolyte. The diameter of the cylinder 31 does not exceed 1 / 2 of the width a of the microchannel 20. The spacing b between adjacent cylinders 31 and the spacing c between the cylinder 31 and the microchannel 20 are both less than 1 / 2 of the width a of the microchannel 20.

[0035] Before the electrolyte containing impurity particles flows through the branch flow channels 40 on both sides, the larger impurities contained in the electrolyte will collide with the outer wall of the flow-blocking cylinder 31, thereby changing the flow direction and turning to flow out through the adjacent branch flow channels 31 with larger cross-sectional dimensions, thereby completing the separation operation of large particle impurities. Before the electrolyte flowing into the microchannel 20 enters the microchannel 20, it will pass through the flow-blocking cylinder 31 to generate cylindrical turbulence, which increases the turbulent intensity of the flow, so that when flowing through the microchannel 20, it is less likely to be blocked.

[0036] The present application is directed to the structure of the microchannel 20 in the bipolar battery. It can rely on the original electrolyte distribution plate and set a flow blocking array 30 in front of the entrance of the microchannel 20 to change the flow direction of the impurity particles so that they flow into the adjacent larger branch channel 40. At the same time, a cylindrical turbulence effect is generated on the electrolyte flowing through the microchannel 20, thereby increasing the turbulence intensity of the electrolyte during flow, thereby further reducing the risk of microchannel blockage.

[0037] A pre-structure for preventing microchannel clogging is designed in the present application. By diverting larger particles in advance in front of the microchannel entrance, it is ensured that the fluid entering the microchannel is free of impurities or contains only tiny impurities, thereby ensuring smooth flow through the microchannel. At the same time, the turbulence intensity of the fluid flowing through the microchannel is increased after the cylindrical disturbance, which can further reduce the risk of microchannel clogging.

[0038] The above detailed description of the embodiments of the present application is only a preferred embodiment of the present application and cannot be considered to limit the scope of implementation of the present application. All equivalent changes and improvements made within the scope of the present application should still fall within the scope of the patent coverage of the present application.

Claims

1. A pre-structure for preventing microchannel clogging, characterized in that: include: Before entering the microchannel inlet, all electrolytes pass through a flow-blocking array formed by a number of flow-blocking cylinders. The electrolyte containing large particle impurities flows away through the branch flow channel, and the electrolyte without impurities or containing smaller particle impurities flows away through the microchannel.

2. A pre-structure for preventing microchannel clogging according to claim 1, characterized in that: All the branch flow channels and the micro flow channels are interconnected and are interconnected with the flow channel inlet.

3. A pre-structure for preventing microchannel clogging according to claim 1 or 2, characterized in that: At least two branch flow channels are provided; all the branch flow channels are arranged on both sides of the micro flow channel.

4. The pre-structure for preventing microchannel blockage according to claim 3, characterized in that: The cross-sectional width of the branch channel is greater than the cross-sectional width of the microchannel.

5. A pre-structure for preventing microchannel clogging according to any one of claims 1 to 2 and 4, characterized in that: The flow blocking array comprises a plurality of cylinders which are arranged at the entrance of the microchannel and are distributed at intervals.

6. The pre-structure for preventing microchannel clogging according to claim 5, characterized in that: The number of the cylinders is at least 2.

7. The pre-structure for preventing microchannel clogging according to claim 5, characterized in that: The cylinders are arranged close to the micro-channel inlet, and all the cylinders have the same diameter.

8. The pre-structure for preventing microchannel blockage according to claim 7, characterized in that: The diameter of the cylinder does not exceed 1 / 2 of the width of the microchannel.

9. The pre-structure for preventing microchannel blockage according to claim 8, characterized in that: The intervals between adjacent cylinders and the interval between the cylinder and the microchannel are both smaller than 1 / 2 of the width of the microchannel.

10. A pre-structure for preventing microchannel clogging according to any one of claims 6 to 9, characterized in that: The cylinder and the electrolyte distribution plate are integrally formed by injection molding or compression molding.

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