Self-adaptive magnetic drive type battery pack phase change heat management device

Abstract

The invention belongs to the field of battery heat management, and particularly relates to a self-adaptive magnetic drive type battery pack phase change heat management device. The device comprises a phase change material, an electromagnet, a power supply module, a copper rod, a common magnet and a flow guide pipe, a cavity is formed between an end single battery of the battery pack and the battery pack shell, and the cavity is filled with a solid-state phase change material; a plurality of groups of copper rods are transversely inserted into the solid phase change material, common magnets are slidably mounted at the ends, close to the battery pack shell, of each group of copper rods, a plurality of electromagnets are distributed on the battery pack shell, the electromagnets correspond to the magnets one to one, and when the electromagnets and the common magnets are opposite in magnetic pole, the electromagnets generate repulsive force on the common magnets; when the electromagnet and the common magnet have the same magnetic pole, the electromagnet generates attraction to the common magnet; the electromagnet is electrically connected with the power supply module; a plurality of flow guide pipes are distributed on two sides of the end part of the battery pack shell along the height direction; two ends of the flow guide pipes are communicated with one side, close to and far away from the end part single batteries, of the cavity. The phase-change material in close contact with the battery is always kept in a solid state, and the phase-change material always takes latent heat as a main component to absorb heat of the battery, so that the heat management performance is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery thermal management, and particularly relates to an adaptive magnetically driven battery pack phase change thermal management device. Background Art

[0002] Existing battery thermal management systems can be divided into various methods such as air cooling, liquid cooling, phase change material cooling, heat pipe cooling, and thermoelectric refrigeration. Phase change material cooling utilizes the latent heat when the phase change material undergoes a phase change to store heat. After the phase change material is completely melted into a liquid state, the fluidity of the liquid phase change material is used to balance the temperature difference between individual cells in the battery pack, improving the temperature consistency of the battery pack, and having advantages such as not consuming energy and low maintenance costs.

[0003] In the existing battery phase change material cooling thermal management system, when the battery temperature rises, the phase change material in the area near the battery will preferentially absorb heat and undergo a phase change. As the phase change material in the nearby area is completely liquefied, its heat absorption mode gradually changes to sensible heat dominance, and the heat storage capacity of sensible heat is significantly lower than that of latent heat. The thermal conductivity of the liquid phase change material is significantly lower than that of the solid phase change material. Therefore, the heat conduction performance in the liquefied area decreases. This dual effect not only weakens the continuous heat dissipation ability of the system but also hinders the surrounding solid phase change material from absorbing heat through the latent heat of phase change, ultimately leading to the overall performance degradation of the battery thermal management system. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the technical problem to be solved by the present invention is to provide an adaptive magnetically driven battery pack phase change thermal management device.

[0005] The present invention adopts the following technical solutions to solve the above technical problems:

[0006] An adaptive magnetically driven battery pack phase change thermal management device, characterized in that it includes a phase change material, an electromagnet, a power supply module, a copper rod, a permanent magnet, and a diversion tube;

[0007] A cavity is formed between the end monomer cell of the battery pack and the battery pack housing, and the cavity is filled with a solid phase change material; multiple groups of copper rods are horizontally inserted into the solid phase change material and are connected to the battery pack housing and the end monomer cell; a permanent magnet is slidably installed at the end of each group of copper rods adjacent to the battery pack housing, and a plurality of electromagnets are distributed on the battery pack housing, with the electromagnets corresponding to the magnets one by one. When the poles of the electromagnet and the permanent magnet are opposite, the electromagnet generates a repulsive force on the permanent magnet; when the poles of the electromagnet and the permanent magnet are the same, the electromagnet generates an attractive force on the permanent magnet; the electromagnet is electrically connected to the power supply module at the same time; a plurality of diversion tubes are distributed along the height direction on both sides of the end of the battery pack housing, and both ends of the diversion tube are respectively communicated with one side of the cavity adjacent to and away from the end monomer cell, and the diversion tube serves as a flow channel for the liquid phase change material.

[0008] Furthermore, the device further includes a temperature control switch; the temperature control switch is located on the connection line between the electromagnet and the power supply module and is in contact with the surface of the end unit cell at the same time. When the surface temperature of the end unit cell is greater than or equal to the phase change temperature of the solid phase change material, the temperature control switch closes.

[0009] Furthermore, the working process of the device is as follows:

[0010] When the surface temperature of the end unit cell reaches the phase change temperature of the solid phase change material, a layer of solid phase change material in close contact with the end unit cell absorbs heat and undergoes a phase change to become a liquid phase change material. The electromagnet generates a magnetic pole opposite to that of the ordinary magnet, generating a repulsive force on the ordinary magnet, causing the ordinary magnet to push the solid phase change material towards the direction close to the end unit cell. After being squeezed, the liquid phase change material flows through the diversion tube to the side of the solid phase change material adjacent to the ordinary magnet;

[0011] Before the liquid phase change material on the side of the solid phase change material adjacent to the ordinary magnet completes solidification, the electromagnet generates a magnetic pole the same as that of the ordinary magnet, generating an attractive force on the ordinary magnet, causing the ordinary magnet to reset; after the liquid phase change material on the side of the solid phase change material adjacent to the ordinary magnet is completely solidified, the electromagnet generates a magnetic pole opposite to that of the ordinary magnet again, generating a repulsive force on the ordinary magnet, causing the ordinary magnet to push the solid phase change material towards the direction close to the end unit cell and come into contact with the end unit cell;

[0012] Repeat the above process. The solid phase change material absorbs heat layer by layer and undergoes a phase change to cool down the end unit cell. When the surface temperature of the end unit cell is lower than the phase change temperature of the solid phase change material, the device stops working.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] The device generates a repulsive force on the ordinary magnet through the electromagnet, causing the ordinary magnet to push the solid phase change material towards the battery and squeezing the liquid phase change material formed due to the phase change to flow through the diversion tube to the outside of the solid phase change material. The inner side of the solid phase change material is in contact with the battery. In the form that the solid phase change material is in contact with the battery layer by layer and undergoes a phase change, the phase change material in close contact with the battery always remains solid, so that the heat absorption of the phase change material from the battery is mainly latent heat, thereby improving the battery thermal management performance. At the same time, it also solves the problems in the existing thermal management system that the thermal conductivity decreases due to the complete liquefaction of the phase change material in the area near the battery, and the liquid phase change material in the nearby area hinders the solid phase change material in other areas from absorbing heat by latent heat, resulting in a decrease in the battery thermal management performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the overall structure diagram of the present invention;

[0016] Figure 2 It is the principle diagram of the present invention;

[0017] Figure 3 It is a schematic diagram of the positions of the electromagnet, the common magnet and the copper rod of the present invention;

[0018] Figure 4 It is a work flow chart of the present invention;

[0019] Figure numerals: 1-battery pack; 2-solid phase change material; 3-end single battery; 4-electromagnet; 5-power supply module; 6-copper rod; 7-ordinary magnet; 8-flow guide tube; 9-conducting wire; 10-normally closed temperature control switch; 11-liquid phase change material. DETAILED DESCRIPTION

[0020] Specific embodiments are given below in conjunction with the accompanying drawings. The specific embodiments are only used to introduce the technical solutions of the present invention in detail and are not intended to limit the protection scope of the present application.

[0021] The present invention provides an adaptive magnetic drive type battery pack phase change thermal management device, comprising a phase change material, an electromagnet 4, a power supply module 5, a copper rod 6, a common magnet 7 and a flow guide tube 8;

[0022] A cavity is formed between the end single cell 3 of the battery pack 1 and the outer shell of the battery pack 1, and the cavity is filled with a solid phase change material 2, and the solid phase change material 2 is in a block shape in the cavity; multiple groups of copper rods 6 are horizontally inserted into the solid phase change material 2, and the two ends are respectively fixed to the inner wall of the outer shell of the battery pack 1 and the end single cell 3, each group includes at least one copper rod 6, and the copper rod 6 not only serves as a slideway for the ordinary magnet 7, but also the heat of the battery pack 1 can be transferred to the solid phase change material 2 through the copper rod 6, thereby increasing the heat conduction path; the end of each group of copper rods 6 adjacent to the outer shell of the battery pack 1 is slidably installed with an ordinary magnet 7, and the ordinary magnet 7 can be in close contact with the side of the solid phase change material 2 adjacent to the outer shell of the battery pack 1; multiple electromagnets 4 are distributed on the outer shell of the battery pack 1 On the top, the electromagnet 4 corresponds to the magnet 7 one by one and the magnetic poles of the electromagnet 4 and the ordinary magnet 7 are directly opposite. All the electromagnets 4 are connected to the power supply module 5 through the wire 9. The power supply module 5 provides the electromagnet 4 with a current of variable direction, so that the magnetic poles of the electromagnet 4 change; when the magnetic poles of the electromagnet 4 and the ordinary magnet 7 are opposite, the electromagnet 4 generates a repulsive force on the ordinary magnet 7, so that the ordinary magnet 7 moves along the copper rod 6 in the direction close to the solid phase change material 2, and pushes the solid phase change material 2 to move in the direction close to the end single battery 3; when the magnetic poles of the electromagnet 4 and the ordinary magnet 7 are the same, the electromagnet 4 generates an attractive force on the ordinary magnet 7, so that the ordinary magnet 7 moves in the direction away from the solid phase change material 2, thereby resetting the ordinary magnet 7;

[0023] On both sides of the end of the housing of the battery pack 1, a plurality of diversion tubes 8 are distributed along the height direction of the battery pack 1. One end of the diversion tube 8 communicates with one side of the single cell 3 adjacent to the end of the cavity, and the other end communicates with the other side of the single cell 3 away from the end of the cavity, so that the liquid phase change material 11 flows to the outside of the solid phase change material 2 (the side adjacent to the ordinary magnet 7) through the diversion tube 8.

[0024] The device further includes a normally closed temperature control switch 10; the normally closed temperature control switch 10 is located on the wire 9 and contacts the surface of the end single cell 3. When the surface temperature of the end single cell 3 is greater than or equal to the phase change temperature of the solid phase change material 2, the normally closed temperature control switch 10 closes, and the electromagnet 4 is energized to generate magnetic poles.

[0025] The working principle and working process of the present invention are as follows:

[0026] When the battery pack 1 is working, its temperature rises. When the surface temperature of the end single cell 3 reaches the phase change temperature of the solid phase change material 2, a layer of the solid phase change material 2 in close contact with the end single cell 3 absorbs heat and undergoes a phase change to become the liquid phase change material 11. The normally closed temperature control switch 10 closes, and the power supply module 5 supplies power to the electromagnet 4. The electromagnet 4 is energized to generate magnetic poles opposite to those of the ordinary magnet 7. The electromagnet 4 generates a repulsive force on the ordinary magnet 7, causing the ordinary magnet 7 to move along the copper rod 6 towards the direction close to the solid phase change material 2 and push the solid phase change material 2 towards the direction close to the end single cell 3. After being squeezed, the liquid phase change material 11 flows through the diversion tube 8 to the outside of the solid phase change material 2;

[0027] After a period of time, the liquid phase change material 11 that has flowed to the outside of the solid phase change material 2 gradually cools down and solidifies. To prevent the situation that the ordinary magnet 7 cannot be reset due to the complete solidification of this part of the liquid phase change material 11, before the liquid phase change material 11 outside the solid phase change material 2 is completely solidified, the power supply module 5 changes the current direction, so that the electromagnet 4 generates magnetic poles the same as those of the ordinary magnet 7. The electromagnet 4 generates an attractive force on the ordinary magnet 7, causing the ordinary magnet 7 to move away from the phase change material and reset;

[0028] After the liquid phase change material 11 outside the solid phase change material 2 is completely solidified, the power supply module 5 changes the current direction again, so that the electromagnet 4 generates magnetic poles opposite to those of the ordinary magnet 7. The electromagnet 4 generates a repulsive force on the ordinary magnet 7, causing the ordinary magnet 7 to push the solid phase change material 2 towards the direction close to the end single cell 3 and contact the end single cell 3. A layer of the solid phase change material 2 in close contact with the end single cell 3 absorbs heat and undergoes a phase change, repeating the above process, so that the solid phase change material 2 undergoes a phase change layer by layer to cool down the end single cell 3. When the surface temperature of the end single cell 3 is lower than the phase change temperature of the solid phase change material 2, the normally closed temperature control switch 10 disconnects, and the device stops working.

[0029] Through the form of the solid-state phase change material 2 in layer-by-layer contact with the battery, the phase change material in contact with the battery is always in a solid state, so that the heat absorption of the phase change material from the battery is mainly latent heat, enhancing the heat dissipation effect and improving the thermal management performance.

[0030] What is not described in the present invention is applicable to the prior art.

Claims

1. An adaptive magnetic drive type battery pack phase change heat management device, characterized in that, It includes a phase change material, an electromagnet, a power supply module, a copper rod, a common magnet, and a diversion tube; A cavity is formed between the end unit cell of the battery pack and the battery pack housing, and the cavity is filled with a solid phase change material; Multiple groups of copper rods are horizontally inserted into the solid phase change material and are connected to the battery pack housing and the end unit cell; A common magnet is slidably mounted at the end of each group of copper rods adjacent to the battery pack housing, and multiple electromagnets are distributed on the battery pack housing. The electromagnets correspond to the magnets one by one. When the magnetic poles of the electromagnet and the common magnet are opposite, the electromagnet generates a repulsive force on the common magnet; When the magnetic poles of the electromagnet and the common magnet are the same, the electromagnet generates an attractive force on the common magnet; The electromagnet is electrically connected to the power supply module at the same time; On both sides of the end of the battery pack housing, a plurality of diversion tubes are distributed along the height direction. The two ends of the diversion tube are respectively communicated with one side of the cavity adjacent to and away from the end unit cell, and the diversion tube serves as a flow channel for the liquid phase change material.

2. The adaptive magnetic drive type battery pack phase change heat management device according to claim 1, wherein The device further includes a temperature control switch; The temperature control switch is located on the connection line between the electromagnet and the power supply module and is in contact with the surface of the end unit cell at the same time. When the surface temperature of the end unit cell is greater than or equal to the phase change temperature of the solid phase change material, the temperature control switch closes.

3. The adaptive magnetic drive type battery pack phase change heat management device according to claim 1 or 2, characterized in that, The working process of the device is as follows: When the surface temperature of the end unit cell reaches the phase change temperature of the solid phase change material, a layer of solid phase change material in close contact with the end unit cell absorbs heat and undergoes a phase change to become a liquid phase change material. The electromagnet generates a magnetic pole opposite to that of the common magnet, generating a repulsive force on the common magnet, causing the common magnet to push the solid phase change material towards the direction close to the end unit cell. After being squeezed, the liquid phase change material flows through the diversion tube to the side of the solid phase change material adjacent to the common magnet; Before the liquid phase change material on the side of the solid phase change material adjacent to the common magnet completes solidification, the electromagnet generates a magnetic pole the same as that of the common magnet, generating an attractive force on the common magnet, causing the common magnet to reset; After the liquid phase change material on the side of the solid phase change material adjacent to the common magnet is completely solidified, the electromagnet generates a magnetic pole opposite to that of the common magnet again, generating a repulsive force on the common magnet, causing the common magnet to push the solid phase change material towards the direction close to the end unit cell and contact the end unit cell; Repeat the above process. The solid phase change material absorbs heat and undergoes a phase change layer by layer to cool the end unit cell. When the surface temperature of the end unit cell is lower than the phase change temperature of the solid phase change material, the device stops working.

Images