Magnetic pulsating heat pipe power battery heat dissipation system

Abstract

The utility model discloses a power battery heat dissipation system which is efficient in heat dissipation and intelligent in control and is provided with a dynamic heat transfer medium magnetic pulsating heat pipe. The utility model comprises a plurality of single batteries and a heat dissipation device, a double-layer heat exchange plate is arranged between the adjacent single batteries, the middle part of the double-layer heat exchange plate is filled with a heat conduction layer, a pulsating heat pipe is semi-embedded in the heat conduction layer, the upper parts of all pulsating heat pipes penetrate out of the heat conduction layer and are arranged in the heat dissipation device, and the heat dissipation device is arranged in the heat dissipation device. The pulsating heat pipe is filled with a medium, the medium is filled with magnetic particles, the pipe wall of the pulsating heat pipe is sequentially sleeved with a plurality of electromagnetic coils, the power battery heat dissipation system of the magnetic pulsating heat pipe further comprises a switch circuit module and a controller, and the switch circuit module is electrically connected with the electromagnetic coils and the controller. The utility model is applied to the technical field of power batteries.

Description

Technical Field

[0001] The utility model relates to a power battery heat dissipation system, in particular to a magnetic pulsating heat pipe power battery heat dissipation system. Background Art

[0002] As energy and environmental issues become increasingly prominent, electrification and cleanness in the vehicle industry have become an inevitable trend. Lithium-ion batteries have become the most widely used batteries in electric vehicles due to their longer cycle life, higher energy, power and voltage. However, during the charging and discharging process, lithium batteries generate a lot of heat due to the internal resistance and internal chemical reactions of the battery. If this heat cannot be discharged in time, it will seriously damage the battery performance and affect the safety of the vehicle.

[0003] Pulsating heat pipe is an advanced heat transfer device. Compared with traditional heat pipes, its innovation is that it does not have a built-in liquid wick structure, but achieves efficient heat transfer through capillary action and periodic pulsation of the working liquid in the pipe. Using pulsating heat pipes in the field of power battery heat dissipation is currently a hot research direction.

[0004] Pulsating heat pipe cooling has many advantages, but the current pulsating heat pipes need a certain amount of time to start up before they can produce a pulsating cycle. Power batteries usually heat up faster when under load. The long start-up time of the pulsating heat pipe will cause heat accumulation in the power battery, thereby affecting the operation of the power battery. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a power battery heat dissipation system with efficient heat dissipation, intelligent control and magnetic pulsation heat pipe having a dynamic heat transfer medium.

[0006] The technical solution adopted by the utility model is as follows: the utility model includes a plurality of battery cells and a heat dissipation device, a double-layer heat exchange plate is arranged between adjacent battery cells, the middle part of the double-layer heat exchange plate is filled with a heat conductive layer, a pulsating heat pipe is half-embedded in the heat conductive layer, the upper parts of all the pulsating heat pipes pass through the heat conductive layer and are placed in the heat dissipation device, the pulsating heat pipe is filled with a medium, the medium is filled with magnetic particles, a plurality of electromagnetic coils are sequentially sleeved on the tube wall of the pulsating heat pipe, the magnetic pulsating heat pipe power battery heat dissipation system also includes a switch circuit module and a controller, the switch circuit module is electrically connected to the electromagnetic coil and the controller respectively, and each of the electromagnetic coils is controlled on and off by one of the switch circuit modules.

[0007] Furthermore, the magnetic pulsating heat pipe power battery cooling system also includes a controller extension module, which is electrically connected to the switch circuit module, and the controller controls the action of the switch circuit module through the controller extension module; the switch circuit module is a relay.

[0008] Furthermore, the heat dissipation device is a liquid cooling box or several layers of heat dissipation fins, and a liquid inlet and a liquid outlet are respectively provided at both ends of the liquid cooling box, and the upper parts of all the pulsating heat pipes are placed inside the liquid cooling box; the upper parts of the pulsating heat pipes are placed between two adjacent layers of heat dissipation fins.

[0009] Furthermore, the magnetic particles are ferromagnetic particles made of iron, the interior of the ferromagnetic particles is provided with a cavity structure, and the exterior of the ferromagnetic particles is provided with a surface oxide layer.

[0010] Furthermore, the magnetic particles include solid iron ferromagnetic particles, and the outer layer of the solid iron ferromagnetic particles is wrapped with a hydrophilic modified polyethylene wrapping layer.

[0011] Furthermore, the medium is a liquid medium, the liquid medium is alcohol, the density of the magnetic particles is the same as the density of the medium, and the magnetic particles have hydrophilic properties.

[0012] Furthermore, a clamping plate is installed on the outer sides of the two outermost battery cells, and the double-layer heat exchange plate is also arranged between the clamping plate and the outermost battery cells. A cross bar is arranged on the outer side of the clamping plate, and a fastening bolt is inserted between the two cross bars. Locking nuts are arranged at both ends of the fastening bolts, and the locking nuts are used to fasten all the battery cells between the two cross bars.

[0013] Furthermore, the heat-conducting layer is a heat-conducting adhesive layer.

[0014] The beneficial effects of the utility model are as follows:

[0015] 1. Efficient heat dissipation: The pulsating heat pipe uses the phase change heat transfer principle and combines with magnetic particles to enhance the heat transfer effect, achieving efficient and rapid heat dissipation of the power battery, i.e., the battery cell, and effectively extending the service life of the battery cell;

[0016] 2. Intelligent control: Equipped with an intelligent control system, it can automatically trigger the cooling program according to the battery temperature, control the power-on of the electromagnetic coils one by one through the controller expansion module, realize the precise regulation of the medium flow in the pulsating heat pipe, and improve the cooling efficiency;

[0017] 3. Optimized structure: The heat exchange plate adopts a double-layer structure with a thermal conductive adhesive layer in the middle to enhance the heat conduction efficiency; the fixing method of the splint and the crossbar ensures a stable structure and is easy to assemble and maintain;

[0018] 4. Dynamic heat transfer medium: Magnetic particles are filled in the medium of the pulsating heat pipe to form a magnetic pulsating heat pipe. The flow can be regulated by the magnetic field generated by the electromagnetic coil to enhance the heat transfer effect. The magnetic particles are prepared by powder metallurgy technology and are divided into two types: hollow and wrapped hydrophilic modified polyethylene. They can be suspended in the medium to improve the heat transfer stability.

[0019] 5. Adaptability: Through screening methods, the density of magnetic particles is matched with that of the medium, and they are suspended in the medium. They can flow freely in the pulsating heat pipe without the need for additional gravity, thus adapting to the heat transfer requirements under different working conditions.

[0020] 6. Diversified heat dissipation methods: Liquid cooling can be achieved by using a liquid cooling box with a liquid inlet and outlet, or by installing multiple layers of heat sinks on the top of the pulsating heat pipe to achieve air cooling, which has strong flexibility and adaptability;

[0021] 7. Precise temperature control: The heat dissipation process is intelligent. When the temperature difference between the upper and lower parts of the pulsating heat pipe is reduced to the set value, the electromagnetic coil will automatically stop working, realizing the refined control of the heat dissipation process and energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a side sectional view of the magnetic pulsating heat pipe power battery cooling system;

[0023] Figure 2 It is a schematic diagram of the coordination between the battery cell and the double-layer heat exchange plate;

[0024] Figure 3 is a schematic diagram of the interior of a pulsating heat pipe;

[0025] Figure 4 It is a schematic diagram of the control relationship of the utility model;

[0026] Figure 5 is a schematic diagram of magnetic particles according to specific embodiment 1;

[0027] Figure 6 is a schematic diagram of magnetic particles of specific embodiment 2; DETAILED DESCRIPTION Specific embodiment 1

[0029] like Figures 1 to 4As shown, in this embodiment, the utility model includes a plurality of battery cells 1 and a heat dissipation device 2, a double-layer heat exchange plate 3 is arranged between adjacent battery cells 1, a clamping plate 12 is installed on the outer sides of the two outermost battery cells 1, and the double-layer heat exchange plate 3 is also arranged between the clamping plate 12 and the outermost battery cell 1, the middle part of the double-layer heat exchange plate 3 is filled with a heat conductive layer 4, a pulsating heat pipe 5 is half-embedded in the heat conductive layer 4, the upper part of all the pulsating heat pipes 5 passes through the heat conductive layer 4 and is placed in the heat dissipation device 2, the pulsating heat pipe 5 is filled with a medium 6, and the medium 6 is filled with magnetic particles 7, and a plurality of electromagnetic coils 8 are sequentially sleeved on the tube wall of the pulsating heat pipe 5, and the magnetic pulsating heat pipe power battery heat dissipation system also includes a switch circuit module 9 and a controller 10, the switch circuit module 9 is electrically connected to the electromagnetic coil 8 and the controller 10 respectively, and each of the electromagnetic coils 8 is controlled on and off by a switch circuit module 9.

[0030] In this embodiment, a cross bar 13 is provided on the outer side of the clamping plate 12 , a fastening bolt 14 is inserted between the two cross bars 13 , and locking nuts 15 are provided at both ends of the fastening bolt 14 , and the locking nuts 15 are used to fasten all the battery cells 1 between the two cross bars 13 .

[0031] In this embodiment, the magnetic pulsating heat pipe power battery cooling system also includes a controller expansion module 11, which is electrically connected to the switch circuit module 9, and the controller 10 controls the action of the switch circuit module 9 through the controller expansion module 11; the switch circuit module is a relay.

[0032] In this embodiment, the heat dissipation device 2 is a liquid cooling box 21 or several layers of cooling fins. The two ends of the liquid cooling box 21 are respectively provided with a liquid inlet 22 and a liquid outlet 23. The upper parts of all the pulsating heat pipes 5 are placed inside the liquid cooling box 21; the upper parts of the pulsating heat pipes 5 are placed between two adjacent layers of cooling fins.

[0033] In this embodiment, if Figure 5As shown, the magnetic particles 7 are iron ferromagnetic particles 71a, the interior of the ferromagnetic particles 71a is provided with a cavity structure 72a, the exterior of the ferromagnetic particles 71a is provided with a surface oxide layer 73a, and the preparation method of the ferromagnetic particles 71a includes the following steps: A1. By using powder metallurgy technology, first prepare iron powder or other iron-based alloy powder, and mix it with a pore-forming agent, wherein the pore-forming agent is a combustible or volatile substance such as paraffin or sawdust; A2. After pressing and molding, during the high-temperature sintering process, the pore-forming agent will evaporate or burn, leaving a pore structure; A3. After high-temperature sintering, crushing is performed to form particles; A4. The particles are oxidized to form the surface oxide layer 73a, and the crushed particles are screened with a liquid having the same density as the medium 6 in the pulsating heat pipe 5 to remove floating particles and sinking particles and obtain suspended particles; A5. Screening is performed, and the particles under the screen are screened with a filter, and the particles are the required ferromagnetic particles 71a.

[0034] In this embodiment, the medium 6 is a liquid medium, and the liquid medium is alcohol. The density of the magnetic particles 7 is the same as that of the medium 6, and the magnetic particles 7 have hydrophilic properties.

[0035] In this embodiment, the heat conducting layer 4 is a heat conducting adhesive layer.

[0036] In this embodiment, the working method of the utility model includes the following steps:

[0037] S1. When the temperature sensor module is embedded in the battery cell 1, when the heat of the battery cell 1 reaches the heat dissipation trigger threshold;

[0038] S2. After the controller 10 receives the heat reaching the heat dissipation trigger threshold, the controller 10 expansion module controls the switch circuit module 9 to operate, thereby powering the electromagnetic coil 8. The electromagnetic coils 8 are powered on one by one in sequence, and the next coil in the clockwise direction is powered on at intervals, thereby causing the internal magnetic particles 7 to move clockwise under the action of the magnetic field. Since the magnetic particles 7 have a surface oxide layer and have hydrophilic (medium) characteristics, they carry the liquid medium to move, forming a medium flow, and this process is repeated;

[0039] S3. Temperature sensors are also installed at the upper and lower parts of the pulsating heat pipe 5. When the temperature difference between the upper part and the lower part of the pulsating heat pipe 5 is less than the set value, the electromagnetic coil 8 stops working, and an internal circulation is formed in the pulsating heat pipe 5. The internal circulation is formed in the pulsating heat pipe 5, and the liquid inlet 22 of the liquid cooling box 21 and the liquid outlet 23 are coordinated to realize the cooling of the upper part of the pulsating heat pipe 5. The liquid cooling box at the upper part of the pulsating heat pipe 5 can also be replaced by a multi-layer heat sink installed horizontally on the pulsating heat pipe 5, thereby playing a role in cooling the pulsating heat pipe 5, thereby realizing timely heat dissipation of the heat of the battery cell 1.

[0040] In this embodiment, the heat dissipation trigger threshold is 60 degrees, and the temperature difference setting value is 5 degrees. Specific embodiment 2

[0042] like Figures 1 to 4 As shown, in this embodiment, the utility model includes a plurality of battery cells 1 and a heat dissipation device 2, a double-layer heat exchange plate 3 is arranged between adjacent battery cells 1, a clamping plate 12 is installed on the outer sides of the two outermost battery cells 1, and the double-layer heat exchange plate 3 is also arranged between the clamping plate 12 and the outermost battery cell 1, the middle part of the double-layer heat exchange plate 3 is filled with a heat conductive layer 4, a pulsating heat pipe 5 is half-embedded in the heat conductive layer 4, the upper part of all the pulsating heat pipes 5 passes through the heat conductive layer 4 and is placed in the heat dissipation device 2, the pulsating heat pipe 5 is filled with a medium 6, and the medium 6 is filled with magnetic particles 7, and a plurality of electromagnetic coils 8 are sequentially sleeved on the tube wall of the pulsating heat pipe 5, and the magnetic pulsating heat pipe power battery heat dissipation system also includes a switch circuit module 9 and a controller 10, the switch circuit module 9 is electrically connected to the electromagnetic coil 8 and the controller 10 respectively, and each of the electromagnetic coils 8 is controlled on and off by a switch circuit module 9.

[0043] In this embodiment, a cross bar 13 is provided on the outer side of the clamping plate 12 , a fastening bolt 14 is inserted between the two cross bars 13 , and locking nuts 15 are provided at both ends of the fastening bolt 14 , and the locking nuts 15 are used to fasten all the battery cells 1 between the two cross bars 13 .

[0044] In this embodiment, the magnetic pulsating heat pipe power battery cooling system also includes a controller expansion module 11, which is electrically connected to the switch circuit module 9, and the controller 10 controls the action of the switch circuit module 9 through the controller expansion module 11; the switch circuit module is a relay.

[0045] In this embodiment, the heat dissipation device 2 is a liquid cooling box 21 or several layers of cooling fins. The two ends of the liquid cooling box 21 are respectively provided with a liquid inlet 22 and a liquid outlet 23. The upper parts of all the pulsating heat pipes 5 are placed inside the liquid cooling box 21; the upper parts of the pulsating heat pipes 5 are placed between two adjacent layers of cooling fins.

[0046] In this embodiment, if Figure 6As shown, the magnetic particles 7 include solid iron ferromagnetic particles 71b, and the outer layer of the solid iron ferromagnetic particles 71b is wrapped with a hydrophilic modified polyethylene wrapping layer 72b. The preparation method of the magnetic particles 7 includes the following steps: B1. grinding ferromagnetic particles; B2. screening ferromagnetic particles; B3. placing the ferromagnetic particles in an inclined rotating cylindrical structure, adding modified polyethylene powder and heating the ferromagnetic particles, so that the polyethylene powder is wrapped around the ferromagnetic particles to form the hydrophilic modified polyethylene wrapping layer 72b; B4. using a liquid with the same density as the medium 6 in the pulsating heat pipe 5 to screen the wrapped ferromagnetic particles, and taking the suspended particles in the middle; B5. screening the particles under the screen, which are the required magnetic particles 7.

[0047] In this embodiment, the medium 6 is a liquid medium, and the liquid medium is alcohol. The density of the magnetic particles 7 is the same as that of the medium 6, and the magnetic particles 7 have hydrophilic properties.

[0048] In this embodiment, the heat conducting layer 4 is a heat conducting adhesive layer.

[0049] In this embodiment, the working method of the utility model includes the following steps:

[0050] S1. When the temperature sensor module is embedded in the battery cell 1, when the heat of the battery cell 1 reaches the heat dissipation trigger threshold;

[0051] S2. After the controller 10 receives the heat reaching the heat dissipation trigger threshold, the controller 10 expansion module controls the switch circuit module 9 to operate, thereby powering the electromagnetic coil 8. The electromagnetic coils 8 are powered on one by one in sequence, and the next coil in the clockwise direction is powered on at intervals, thereby causing the internal magnetic particles 7 to move clockwise under the action of the magnetic field. Since the magnetic particles 7 are wrapped with a modified polyethylene layer and have hydrophilic (medium) properties, they carry the liquid medium to move, forming a medium flow, and this process is repeated;

[0052] S3. Temperature sensors are also installed at the upper and lower parts of the pulsating heat pipe 5. When the temperature difference between the upper part and the lower part of the pulsating heat pipe 5 is less than the set value, the electromagnetic coil 8 stops working, and an internal circulation is formed in the pulsating heat pipe 5. The internal circulation is formed in the pulsating heat pipe 5, and the liquid inlet 22 of the liquid cooling box 21 and the liquid outlet 23 are coordinated to realize the cooling of the upper part of the pulsating heat pipe 5. The liquid cooling box at the upper part of the pulsating heat pipe 5 can also be replaced by a multi-layer heat sink installed horizontally on the pulsating heat pipe 5, thereby playing a role in cooling the pulsating heat pipe 5, thereby realizing timely heat dissipation of the heat of the battery cell 1.

[0053] In this embodiment, the heat dissipation trigger threshold is 60 degrees, and the temperature difference setting value is 5 degrees.

[0054] The utility model is applied to the technical field of power batteries.

[0055] Although the embodiments of the present invention are described with practical solutions, they do not constitute limitations on the meaning of the present invention. For those skilled in the art, it is obvious to modify the implementation scheme and combine it with other solutions based on this description.

Claims

1. A magnetic pulsating heat pipe power battery heat dissipation system, comprising a plurality of battery cells (1) and a heat dissipation device (2), wherein a double-layer heat exchange plate (3) is arranged between adjacent battery cells (1), the middle of the double-layer heat exchange plate (3) is filled with a heat conductive layer (4), a pulsating heat pipe (5) is half-embedded in the heat conductive layer (4), the upper parts of all the pulsating heat pipes (5) pass through the heat conductive layer (4) and are placed in the heat dissipation device (2), characterized in that: The pulsating heat pipe (5) is filled with a medium (6), the medium (6) is filled with magnetic particles (7), a plurality of electromagnetic coils (8) are sequentially sleeved on the wall of the pulsating heat pipe (5), the magnetic pulsating heat pipe power battery heat dissipation system further comprises a switch circuit module (9) and a controller (10), the switch circuit module (9) is electrically connected to the electromagnetic coil (8) and the controller (10), respectively, and each of the electromagnetic coils (8) is controlled to be on and off by one of the switch circuit modules (9).

2. According to claim 1, a magnetic pulsating heat pipe power battery cooling system is characterized in that: The magnetic pulsating heat pipe power battery cooling system further comprises a controller extension module (11), the controller extension module (11) being electrically connected to the switch circuit module (9), the controller (10) controlling the action of the switch circuit module (9) via the controller extension module (11); the switch circuit module (9) being a relay.

3. A magnetic pulsating heat pipe power battery cooling system according to claim 2, characterized in that: The heat dissipation device (2) is a liquid cooling box (21) or a plurality of layers of heat dissipation fins; a liquid inlet (22) and a liquid outlet (23) are respectively provided at both ends of the liquid cooling box (21); the upper parts of all the pulsating heat pipes (5) are placed inside the liquid cooling box (21); and the upper parts of the pulsating heat pipes (5) are placed between two adjacent layers of heat dissipation fins.

4. A magnetic pulsating heat pipe power battery cooling system according to claim 2, characterized in that: The magnetic particles (7) are ferromagnetic particles (71a) made of iron. A cavity structure (72a) is provided inside the ferromagnetic particles (71a). A surface oxide layer (73a) is provided outside the ferromagnetic particles (71a).

5. The magnetic pulsating heat pipe power battery cooling system according to claim 2, characterized in that: The magnetic particles (7) comprise solid iron ferromagnetic particles (71b), and the outer layer of the solid iron ferromagnetic particles (71b) is coated with a hydrophilic modified polyethylene coating layer (72b).

6. The magnetic pulsating heat pipe power battery cooling system according to claim 2, characterized in that: The medium (6) is a liquid medium, which is alcohol. The density of the magnetic particles (7) is the same as that of the medium (6), and the magnetic particles (7) have hydrophilic properties.

7. The magnetic pulsating heat pipe power battery cooling system according to claim 2, characterized in that: A clamping plate (12) is installed on the outer sides of the two outermost battery cells (1), and the double-layer heat exchange plate (3) is also arranged between the clamping plate (12) and the outermost battery cell (1). A cross bar (13) is arranged on the outer side of the clamping plate (12), and a fastening bolt (14) is inserted between the two cross bars (13). Locking nuts (15) are arranged at both ends of the fastening bolt (14), and the locking nuts (15) are used to fasten all the battery cells (1) between the two cross bars (13).

8. The magnetic pulsating heat pipe power battery cooling system according to claim 2, characterized in that: The heat-conducting layer (4) is a heat-conducting adhesive layer.

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