Liquid cooling system for controlling diameter change of pipeline based on Ampere force and working method of liquid cooling system

Abstract

The invention discloses a liquid cooling system for controlling pipeline reducing based on Ampere force and a working method of the liquid cooling system, and belongs to the field of liquid cooling system pipe diameter design. According to the Ampere force rule, an eight-copper-wire reducing device with a magnetic field is arranged at the joint of a first-stage pipeline and a second-stage pipeline, and multiple sections of wires are arranged in the composite magnetic field; the diameter-variable pipeline is connected between the wires, the wires are controlled to slide in the sliding grooves by controlling the direction and the size of current of the wires, the diameter of the pipeline is further controlled, and when the pipeline works normally, under the action of a magnetic field, the system counteracts pressure, acting on the wall face, of fluid flowing, so that the shape of the pipeline is maintained; when abnormal temperature difference occurs, the size of the pipe diameter can be controlled through Ampere force, so that the flow of cooling liquid is controlled, the cross sectional area of the variable-diameter pipeline can be adjusted in real time according to the specific numerical value of the temperature difference, and dynamic control over the flow is achieved.

Description

Technical Field

[0001] The invention belongs to the field of pipe diameter design of a liquid cooling system, and in particular relates to a liquid cooling system based on Ampere force control of pipe diameter change and a working method thereof. Background Art

[0002] In today's energy storage cabinets, since the battery cells generate a lot of heat during charging and discharging, which is not conducive to the service life of the battery cells, a cooling system is added to the energy storage cabinet to cool the battery cells during charging and discharging. The mainstream cooling methods in the current market are air cooling and liquid cooling. The liquid cooling system is an efficient and advanced thermal management technology that uses liquid as a cooling medium to achieve effective heat dissipation of energy storage devices such as battery modules or battery stacks. The system is mainly composed of key components such as coolant, liquid cooling plate, liquid cooling pipe, and liquid cooling unit. The coolant circulates in the pipe to absorb and take away the heat from the battery module. Specifically, the coolant first flows into the liquid cooling plate under the battery module through the pipe, closely contacts the battery and absorbs the heat generated by it. Then the heated coolant flows back to the liquid cooling system, passes through the heat dissipation equipment such as the condenser or evaporator in the liquid cooling unit, and dissipates the heat to the external environment, forming a closed-loop cooling cycle, thereby ensuring that energy storage devices such as batteries can continue to operate within a suitable temperature range, improving energy utilization efficiency and system stability.

[0003] At present, when the liquid cooling system is actually used, considering that the coolant needs to overcome gravity when flowing inside the primary pipeline, and there is friction with the wall when flowing, combined with the boundary layer effect, when the coolant reaches the top battery pack liquid cold plate, its flow rate will be significantly smaller than the bottom battery pack. This phenomenon will lead to uneven heat dissipation performance, making the actual temperature difference between the upper battery pack and the lower battery pack too large, affecting the service life of the battery. To address this problem, the current main solution is to calculate the secondary pipeline flow at the interface between each section of the pipeline and the liquid cold plate in advance according to the pipeline shape, liquid cooling unit model and liquid cold plate shape, and then modify the diameter of the secondary pipeline according to the obtained secondary pipeline flow of each layer, so that the flow of each battery pack in the entire liquid cooling system is as consistent as possible, maximizing the liquid cooling performance. However, in actual application, due to the large number of energy storage cabinet structures, liquid cooling units, liquid cold plates, battery cells and other models, each pipe diameter needs to be calculated separately for different styles of products, and once finalized, it cannot be replaced again, so the adaptability to different working conditions is poor. Summary of the invention

[0004] The present invention provides a liquid cooling system and a working method thereof for controlling the diameter change of a pipeline based on Ampere force, wherein a plurality of specific sections of conducting wires are placed in a composite magnetic field, and variable diameter pipelines are connected between the conducting wires, and the diameter of the pipeline is further controlled by controlling the direction of the current.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions:

[0006] A liquid cooling system based on Ampere force to control pipeline diameter change includes a diameter change device, both ends of which are respectively connected to a primary pipeline and a secondary pipeline and sealed; the diameter change device is a device for controlling the pipe diameter size by Ampere force.

[0007] In the above-mentioned system, the diameter-changing device includes a frame, a flange, an elastic tube, and a magnet; pipeline interfaces are arranged at two ends outside the frame and are respectively connected to the primary pipeline and the secondary pipeline; flanges are installed at two ends inside the frame; a hole is opened at the center of the flange, and the elastic tube passes through the hole and is connected to the pipeline interface; a plurality of slide grooves are evenly distributed along the circumference on the side of the center hole of the flange; the corresponding slide grooves on the two flanges are connected with copper wires, and the elastic tube is surrounded by the copper wires; the outside of the copper wires is wrapped with insulating rubber.

[0008] Magnets are installed on the top, bottom and sides of the frame, with the N-stage on the top facing downward and the S-stage on the bottom facing upward, ensuring that the internal magnetic flux lines are perpendicular to the horizontal plane and downward; the N-stage and S-stage magnets on the side are placed opposite to each other, with the N-stage placed on the left and the S-stage placed on the right, ensuring that the magnetic flux lines are parallel to the Y-axis of the horizontal plane and cross the diameter-changing device; the force direction and magnitude of the copper wire are controlled by changing the direction and magnitude of the current in the energized copper wire, so that the two ends of the copper wire slide in the slide groove to control the diameter of the elastic tube.

[0009] The temperature difference acquisition system in the liquid cooling system is connected to the main control unit of the diameter-changing device, and the main control unit controls the current size of the conductive wire.

[0010] When the above-mentioned liquid cooling system based on Ampere force to control the variable diameter of the pipeline is working, when the pipeline is working normally, there is a slightly weak current inside the copper wire, and the current directions of the relative copper wires are opposite. Under the action of the magnetic field, all copper wires are affected by the Ampere force, which offsets the pressure of the fluid flow acting on the wall, thereby maintaining the shape of the variable diameter pipeline part; when a temperature difference occurs, the size and direction of the current are changed according to the specific temperature difference, thereby changing the direction and size of the Ampere force on each copper wire, and adjusting the cross-sectional area at the variable diameter pipeline in real time, thereby realizing dynamic control of the flow rate.

[0011] Beneficial effects: The present invention provides a liquid cooling system and a working method thereof for controlling the diameter change of a pipeline based on Ampere force. According to the Ampere force law, an eight-copper wire diameter change device with a magnetic field is arranged at the interface between the primary pipeline and the secondary pipeline to change the diameter of the pipeline; multiple sections of wires are placed in a composite magnetic field, and the diameter change pipelines are connected between the wires. The sliding of the wires in the slide groove is controlled by controlling the direction and magnitude of the current of the wires, and the diameter of the pipeline is further controlled. The cross-sectional area at the diameter change pipeline can be adjusted in real time according to the specific value of the temperature difference, thereby realizing dynamic control of the flow rate; when the pipeline of the liquid cooling system of the present invention works normally, under the action of the magnetic field, all copper wires are acted upon by the Ampere force, offsetting the pressure of the fluid flow acting on the wall, thereby maintaining the shape of the pipeline; when an abnormal temperature difference occurs, the pipe diameter can be controlled by the Ampere force, thereby controlling the flow rate of the coolant, and it can adapt to different flow requirements, and has strong adaptability to different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the diameter-changing device in an embodiment of the present invention;

[0013] In the figure, 1-frame, 2-flange, 3-magnet, 4-copper wire, 5-slide, 6-insulating rubber tube, 7-pipeline interface. DETAILED DESCRIPTION

[0014] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments:

[0015] like Figure 1 As shown in the figure, a liquid cooling system based on the Ampere force to control the pipe diameter change is shown. The Ampere force is the force on the current-carrying wire in the magnetic field. Based on this characteristic, a specific number of wires can be placed in a composite magnetic field, and the wires are connected with variable diameter pipelines. The diameter of the pipeline can be further controlled by controlling the direction of the current. The Ampere force is the force on the current-carrying wire in the magnetic field. Its acting part is the wire itself, and its magnitude is: ,

[0016] in, It's Ampere Force. is the current in the wire. is the length of the conductor carrying current in the magnetic field segment, is the magnetic field intensity, and the direction of the Ampere force follows the left-hand rule. Therefore, according to the Ampere force rule, a device for controlling the diameter change of the pipeline based on the Ampere force is set between the primary pipeline and the secondary pipeline. The diameter change device includes a frame 1, a flange 2, a magnet 3, a copper wire 4, a slide 5, an insulating rubber tube 6, and a pipeline interface 7; pipeline interfaces 7 are set at both ends of the frame 1 to connect the primary pipeline and the secondary pipeline respectively, and flanges 2 are installed at both ends of the frame 1. A hole is opened at the center of the flange 2. The insulating rubber tube 6 passes through the opening and is connected to the pipeline interfaces 7 at both ends. Eight slides 5 are evenly distributed along the circumference on the side of the center hole of the flange 2. The corresponding slides 5 on the two flanges 2 are connected by copper wires 4. The outside of the copper wire 4 is wrapped with insulating rubber. The eight copper wires 4 are wrapped with insulating rubber tubes 6. The elastic deformation of the insulating rubber tube 6 is large and can be stretched and compressed.

[0017] Magnets 3 are installed on the top, bottom and sides of the frame 1, with the N-pole of the top magnet 3 facing downward and the S-pole of the bottom magnet 3 facing upward, ensuring that the internal magnetic flux lines are perpendicular to the horizontal plane and downward; the N-pole and S-pole of the side magnet 3 are placed opposite to each other, with the N-pole placed on the left and the S-pole placed on the right, ensuring that the magnetic flux lines are parallel to the Y-axis of the horizontal plane and cross the diameter-changing device; the force direction and magnitude of the copper wire 4 are controlled by changing the direction and magnitude of the current in the copper wire 4, so that the two ends of the copper wire 4 slide in the slide groove to control the diameter of the elastic tube.

[0018] When the pipeline is working normally, there is a slightly weak current inside the copper wire. The current direction of the three copper wires on one side points from the inlet to the outlet of the reducer, and the current direction of the three copper wires on the other side is opposite. The current direction of the upper copper wire points from the inlet to the outlet, and the current direction of the lower copper wire is opposite to that of the upper copper wire. At this time, under the action of the magnetic field, all copper wires are subject to the Ampere force, which is used to maintain the shape of the pipeline and make the shape of the reducer consistent with the pipeline at the inlet. The Ampere force on the three copper wires on the right is horizontal to the right, and the Ampere force on the three copper wires on the left is horizontal to the left. The Ampere force on the upper copper wire is vertically downward, and the Ampere force on the lower copper wire is vertically upward. This design is used to offset the pressure of the fluid flow acting on the wall when the coolant circulates inside the pipeline, thereby maintaining the shape of the reducer pipeline part and allowing the coolant to pass smoothly.

[0019] The temperature difference is collected by the BMS system, and then a signal is sent to the main control unit of the variable diameter device according to the collected temperature, and the flow rate is controlled by adjusting the current of the copper wire; according to the specific value of the temperature difference, the cross-sectional area of ​​the variable diameter pipeline can be adjusted in real time, and the adjustment method is to change the size and direction of the current, so as to change the direction and size of the Ampere force on each copper wire, so as to achieve dynamic control of the flow rate; the magnetic field strength is determined by the properties of the magnet used, so it can be regarded as the magnetic field strength B is constant, then the size of the Ampere force can be controlled by the current, and the diameter of the variable diameter system can be controlled according to the size of the Ampere force, so the minimum radius of the variable diameter system is set to , and the size of the water inlet pipe connected to the reducer system is consistent with the minimum radius, and the maximum radius is When the liquid cooling system starts working, all the variable diameter systems are in the initialization state, all the copper wires are in the middle state of the slideway, and the radius of all the variable diameter systems is At this time, the current in the entire variable diameter system, the five copper wires above are used to maintain the shape of the pipeline, so it is only necessary to overcome the pressure of the internal liquid, so that the pressure at the bottom water inlet is , the flow rate at the water inlet is , the length inside the variable diameter system is l, which is equal to the length of the copper wire. Then, at this time, the force on the five copper wires above is: ,

[0020] in is the force on each of the five copper wires above. At this time, the internal current of each copper wire is: ,

[0021] Consider the current inside the three copper wires at the bottom. Since there are eight copper wires at equal intervals around the circumference in this variable diameter system structure, the angle between the bottom copper wire and the adjacent copper wires is 45°, and the three bottom copper wires also need to bear the weight of the internal liquid. Based on the force decomposition and geometric configuration, it can be concluded that the current between the two adjacent copper wires at the bottom is: ,

[0022] Among them, F3 is the force on the two adjacent copper wires at the bottom. is the liquid density;

[0023] And the current of the bottom copper wire is: ,

[0024] At this time, due to the up and down layout of the pipeline space during operation, the flow rate at different branches begins to be uneven, so at this time it is necessary to adjust the current according to the flow rate and pressure, according to the Bernoulli equation: ,

[0025] Among them, h1 is the height of the first branch pipe from the ground. is the radius of the nth branch, and is the pressure and flow rate on different branches. In order to make the flow rate inside each pipe tend to be consistent, then according to the height Calculate , and for Consistent, can get different , will get and Substitute into , and , replacing and , the current in the copper wire in the current-equalizing variable-diameter system can be obtained.

[0026] When a temperature difference of more than 5°C is detected inside one or more battery packs in the energy storage cabinet, it means that there is excess heat inside the battery pack that has not been taken away by the liquid cooling system, resulting in poor temperature uniformity of the battery pack. At this time, it means that the flow of the liquid cooling plate at the bottom of the battery pack needs to be increased, that is, the inner diameter of the reducer at the pipe interface needs to be increased. At this time, the current direction of the three copper wires on the right changes from the original inlet to the outlet to the outlet, the magnetic field remains unchanged, the current increases, then the Ampere force of the three copper wires changes from the original horizontal left to the horizontal right, and the Ampere force increases, causing the three copper wires to move outward along the slide groove on the flange; the current direction of the three copper wires on the left changes from the original outlet to the inlet to the outlet, the magnetic field remains unchanged, the current increases, then the Ampere force of the three copper wires changes from the original horizontal right to the horizontal left. , and the Ampere force becomes larger, causing the three copper wires to move outward along the slide groove on the flange; at the same time, the current direction of the copper wire on the upper side changes from the original inlet to the outlet to the outlet, the magnetic field remains unchanged, the current becomes larger, then the Ampere force of this copper wire changes from the original horizontal downward to horizontal upward, and the Ampere force becomes larger, causing the copper wire to move upward along the slide groove on the flange; the current direction of the copper wire on the lower side changes from the original outlet to the inlet and outlet to the inlet to the outlet, the magnetic field remains unchanged, the current becomes larger, then the Ampere force of this copper wire changes from the original horizontal upward to horizontal downward, and the Ampere force becomes larger, causing the copper wire to move downward along the slide groove on the flange; the above changes cause the cross-sectional area of ​​the reducer to increase, thereby increasing the flow rate, bringing out more heat from the battery cell, reducing the temperature difference of the battery cell, and improving the temperature uniformity.

[0027] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A liquid cooling system based on Ampere force control of pipeline diameter change, characterized in that: It comprises a diameter-changing device, both ends of which are respectively connected with the primary pipeline and the secondary pipeline and sealed, and the diameter-changing device is a device for controlling the pipe diameter by Ampere force.

2. The liquid cooling system based on Ampere force control pipeline diameter change according to claim 1, characterized in that: The diameter-changing device includes a frame, a flange, an elastic tube, and a magnet; pipeline interfaces are arranged at two ends outside the frame and are respectively connected to the primary pipeline and the secondary pipeline; flanges are installed at two ends inside the frame, a hole is opened at the center of the flange, the elastic tube passes through the hole and is connected to the pipeline interface, a plurality of slide grooves are evenly distributed along the circumference on the side of the center hole of the flange, the corresponding slide grooves on the two flanges are connected by copper wires, and the elastic tube is surrounded by the copper wires; magnets are installed on the top, bottom and sides of the frame.

3. The liquid cooling system based on Ampere force control pipeline diameter change according to claim 1 or 2, characterized in that: The temperature difference acquisition system in the liquid cooling system is connected to the main control unit of the diameter-changing device, and the main control unit controls the current size of the conductive wire.

4. The liquid cooling system based on Ampere force control pipeline diameter change according to claim 2, characterized in that: The N stage on top of the frame is placed facing downward, and the S stage on the bottom is placed facing upward.

5. The liquid cooling system based on Ampere force control of pipeline diameter change according to claim 2 or 4, characterized in that: The N-level magnets and the S-level magnets on the side of the frame are placed opposite to each other, with the N-level magnets being placed on the left side and the S-level magnets being placed on the right side.

6. The liquid cooling system based on Ampere force control of pipeline diameter change according to claim 2, characterized in that: The copper wire is externally wrapped with insulating rubber.

7. The liquid cooling system based on Ampere force control pipeline diameter change according to claim 2, characterized in that: The elastic tube is a heat-insulating rubber tube.

8. The working method of the liquid cooling system based on Ampere force control of pipeline diameter change according to any one of claims 1 to 7, characterized in that: The following steps are involved: When the pipeline is working normally, there is a slightly weak current inside the copper wire, and the current directions of the copper wires facing each other are opposite. Under the action of the magnetic field, all copper wires are acted upon by the Ampere force, which offsets the pressure of the fluid flow acting on the wall, thereby maintaining the shape of the variable diameter pipeline part. When a temperature difference occurs, the size and direction of the current are changed according to the specific temperature difference, thereby changing the direction and size of the Ampere force acting on each copper wire, and adjusting the cross-sectional area of ​​the variable diameter pipeline in real time, thereby achieving dynamic control of the flow rate.

9. The working method of the liquid cooling system based on Ampere force control pipeline diameter change according to claim 8 is characterized in that: The internal current of each of the five copper wires above is: ， The current between the two adjacent copper wires at the bottom is: ， The current of the bottom copper wire is: ， in, is the force on each of the five copper wires above, is the pressure at the lowest water inlet, B is the magnetic field strength, l is the length inside the variable diameter system, is the radius of the reducer; F3 is the force on the two adjacent copper wires at the bottom. is the liquid density.

10. The working method of the liquid cooling system based on Ampere force control pipeline diameter change according to claim 9, characterized in that: During operation, due to the up-and-down layout of the pipeline space, the flow velocity at different branches begins to be uneven, and the current needs to be adjusted according to the flow velocity and pressure. According to the Bernoulli equation: ， Among them, h1 is the height of the first branch from the ground, is the radius of the nth branch, and is the pressure and flow rate on different branches. In order to make the flow rate inside each pipe tend to be consistent, according to the height Calculate , and for Consistent, get different , will get and Substitute into , and , replacing and , and obtain the current of the copper wire in the reducer.

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