Heat dissipation device for lithium ion battery pack

Abstract

The utility model belongs to the field of battery pack heat dissipation, and particularly relates to a heat dissipation device of a lithium ion battery pack, which comprises a heat dissipation battery box, a battery, a rectangular heat exchange layer group, an external heat exchange pipeline, two fan groups, an air guide plate, a rod piece, a swing transmission piece and a transmission rod, the circulation mode of cooling water inside the rectangular heat exchange layer can be controlled through the rectangular heat exchange layer, the cooling water generates vortex by damaging a boundary layer, the heat absorption capacity of the cooling water is improved, and the temperature stratification phenomenon of the cooling water is avoided. The circulation direction of cold air around the heat dissipation battery box is controlled through the fan set and the air guide plate, disturbance is generated on the heat dissipation battery box, a scene in which a low-pressure area is formed above the center of the heat dissipation battery box and the pressure intensity around the heat dissipation battery box is relatively high is finally generated, circulation and alternation of internal air of the heat dissipation battery box are accelerated, and therefore the cooling efficiency of the battery pack is improved.

Description

Technical Field

[0001] The utility model belongs to the field of battery pack heat dissipation, in particular to a heat dissipation device for a lithium ion battery pack. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Lithium-ion batteries are widely used in new energy vehicle power battery packs; however, the comprehensive performance of lithium-ion batteries is greatly affected by temperature, and most failures are caused by overheating; overheating of battery packs not only reduces the operating performance and reliability of the equipment, but also leads to increased energy costs and may even endanger the personal safety of users.

[0004] At present, the mainstream heat dissipation methods for power batteries include air cooling, liquid cooling, heat pipe and PCM phase change material cooling. There are also methods of cooling the battery pack by combining two or more methods. For the combined heat dissipation of liquid cooling and air cooling, liquid cooling usually involves installing a heat exchange layer between two adjacent batteries, and dissipating the heat from the battery surface through the cooling water inside the heat exchange layer. However, since the heat exchange layer is a hollow pipe and the shell of the heat exchange layer is made of a single material with thermal conductivity, the cooling water cannot fully take away the heat generated on the battery surface during the flow of the cooling water inside the hollow pipe, and the cooling water will experience temperature stratification. Air cooling usually involves opening a certain number of through holes on the inner surface of the battery shell to increase the contact area between the battery surface and the air to dissipate the heat from the battery. However, this method utilizes the natural flow of air to dissipate the heat from the battery, and the heat dissipation effect is not ideal.

[0005] Therefore, there is an urgent need for a battery pack heat dissipation device that combines liquid cooling and air cooling to effectively dissipate heat from the battery pack. Utility Model Content

[0006] In order to solve the technical problems existing in the above-mentioned background technology, a heat dissipation device for a lithium-ion battery pack is provided, in which a composite material is used as the shell material of a rectangular heat exchange layer, and a tapered corrugated band is installed in a hollow pipe inside the rectangular heat exchange layer to increase the absorption of heat on the battery surface by cooling water; a combination of a fan group and an air guide plate is used to control the flow of air inside the heat dissipation battery box, thereby enhancing the heat dissipation capacity of the air to the battery, thereby achieving sufficient heat dissipation of the battery pack.

[0007] In order to achieve the above objectives, the present disclosure adopts the following technical solutions:

[0008] A heat dissipation device for a lithium-ion battery pack, comprising a heat dissipation battery box, a battery, a rectangular heat exchange layer group, an external heat exchange pipe, two sets of fan groups, an air guide plate, a rod, a swing transmission member and a transmission rod; the heat dissipation battery box comprises four side surfaces, namely a first side shell, a second side shell, a third side shell and a fourth side shell; the first side shell and the third side shell are opposite surfaces, and the second side shell and the fourth side shell are opposite surfaces;

[0009] The external heat exchange pipe is symmetrically installed at the lower end of the first side shell and the third side shell of the heat dissipation battery box; the rectangular heat exchange layer group includes at least two or more rectangular heat exchange layers, and the rectangular heat exchange layer is installed at the bottom of the heat dissipation battery box, and a gap is left between two adjacent rectangular heat exchange layers; the battery is installed in the gap; the shell of the rectangular heat exchange layer adopts a composite material layer, and the interior of the rectangular heat exchange layer is a four-layer hollow pipe with uniform distribution, and the interior of the hollow pipe is installed with a tapered corrugated tie;

[0010] The two groups of fans are symmetrically distributed on the top outside the second side shell and the fourth side shell of the heat dissipation battery box; the swing transmission parts are symmetrically distributed on the upper ends outside the first side shell and the third side shell, and the transmission rods are symmetrically distributed on the lower ends of the swing transmission parts on the first side shell and the third side shell, and are connected to the swing transmission parts; the rod is installed at the upper end inside the heat dissipation battery box, and the two ends of the rod are connected to the swing transmission parts on the first side shell and the third side shell; the air deflectors are distributed in an array on the rod.

[0011] As a further technical solution, the lower end of the fourth side shell of the heat dissipation battery box is connected to the first box body, and a first water pump is installed at the bottom of the first box body; the first water tank is connected to the side of the first box body relative to the fourth side shell, and a first reserved opening is provided on the side where the first box body is connected to the first water tank; a refrigerator is installed at the upper ends of the first water tank and the first box body, and the refrigerator and the first water pump are both provided with a water inlet hole and a water outlet hole; two openings are provided on the side of the first water tank relative to the fourth side shell, which are respectively connected to the water inlet hole and the water outlet hole of the refrigerator through pipes; an opening is provided on the side of the first water tank on the same side as the first side shell; the water inlet hole of the first water pump is connected to the first reserved opening through a pipe.

[0012] As a further technical solution, the second side shell of the heat dissipation battery box is connected to the second box body, and a second water pump is installed at the bottom of the second box body; a second water tank is connected to the side of the second box body relative to the second side shell, a second reserved opening is set on the side where the second box body is connected to the second water tank, and a third reserved opening is set on the side where the second box body is connected to the second side shell; the second water pump is set with a water inlet and a water outlet, the water inlet is connected to the second reserved opening through a pipe, and the water outlet is connected to the third reserved opening through a pipe.

[0013] As a further technical solution, the external heat dissipation pipe is a four-layer three-branch pipe. The four-layer three-branch pipe outside the first side shell is converged on the side close to the first water tank and is connected to the opening on the same side of the first water tank; the four-layer three-branch pipe outside the third side shell is converged on the side close to the first water tank and is connected to the water outlet of the first water pump through the shell of the first box body.

[0014] As a further technical solution, the rectangular heat exchange layer is respectively provided with four openings on the two sides on the same side as the first side shell and the third side shell, and the position of each opening corresponds to the hollow pipe inside the rectangular heat exchange layer; an equal number of openings are provided at the positions of the first side shell and the third side shell of the heat dissipation battery box corresponding to the openings of the rectangular heat exchange layer; the external heat dissipation pipe is connected with the openings of the rectangular heat exchange layer through the openings on the surfaces of the first side shell and the third side shell of the heat dissipation battery box.

[0015] As a further technical solution, the tapered corrugated bond has a cuttlefish fin structure, and is configured such that the amplitude gradually increases from zero at the center toward both ends of the bond, presenting a shape that is small in the middle and large at both ends.

[0016] As a further technical solution, the composite material layer is composed of an internal heat spreader, a middle thermal conductive silicone layer and an external BNNS boron nitride nanocomposite layer film.

[0017] As a further technical solution, the shape of the air deflector is set to be a wing structure.

[0018] As a further technical solution, the fan group includes at least two fans, and the structures and numbers of the fans in the two fan groups are exactly the same.

[0019] As a further technical solution, a detachable filter housing is arranged outside the fan.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In the utility model, the material of the rectangular heat exchange layer is set to a composite material, and a tapered corrugated bond with a cuttlefish fin structure is installed in the hollow pipe inside the rectangular heat exchange layer; the heat generated on the battery surface can be transferred to the cooling water inside the rectangular heat exchange layer more quickly through the composite material, and the tapered corrugated bond can change the circulation path of the cooling water in the hollow pipe, so that the cooling water generates eddy currents during the circulation process, and the heat absorption capacity of the cooling water is increased by destroying the boundary layer, while avoiding the phenomenon of temperature stratification of the cooling water, thereby improving the efficiency of liquid cooling in reducing the battery surface temperature.

[0022] By setting up a fan group and a wing-shaped air deflector, and using a transmission rod and a swing transmission member to control the rotation angle of the air deflector, the air inside and around the heat dissipation battery box is disturbed, the circulation of cold air and hot air is accelerated, and the hot air around the battery pack is quickly replaced, thereby improving the cooling efficiency of the battery pack by air cooling.

[0023] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1 This is the overall structural diagram of the heat dissipation device of the utility model.

[0026] Figure 2 It is a partial structural diagram of the heat dissipation device of the utility model.

[0027] Figure 3 It is a schematic diagram of the structure of the tapered corrugated band in the rectangular heat exchange layer of the utility model.

[0028] Figure 4 It is a schematic diagram of the structure of the composite material layer in the utility model.

[0029] Figure 5 It is a schematic diagram of the intelligent controller of the utility model.

[0030] Among them, 1. the third box, 2. the integrated box, 3. the heat dissipation battery box, 4. the rectangular heat exchange layer group, 5. the external heat exchange pipe, 6. the water pump group, 61. the first water pump, 62. the second water pump, 7. the rectangular heat exchange layer, 8. the battery, 9. the hollow pipe, 10. the composite material layer, 11. the heat spreader, 12. the thermal conductive silicone layer, 13. the BNNS boron nitride nanocomposite layer film, 14. the fan, 15. the air guide plate, 16. the filter housing, 17. the screw, 18. the rod, 19. the swing transmission member, 20. the transmission rod, 21. the tapered corrugated bond, 22. Intelligent controller, 23. Display module, 24. Input part, 25. Output part 1, 26. Output part 2, 27. Temperature sensor, 28. Flame detection sensor, 29. Smoke sensor, 30. Human infrared sensor, 31. Independent button 1, 32. Independent button 2, 33. Independent button 3, 34. Bluetooth module, 35. LED, 36. Buzzer, 37. Independent button 4, 38. Refrigerator, 39. PTC heater, 40. First box, 41. First water tank, 42. Second box, 43. Second water tank, 44. Pipeline. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] Embodiment 1

[0035] like Figure 1-2 As shown, a heat dissipation device for lithium-ion battery packs includes a heat dissipation battery box 3, a battery 8, a rectangular heat exchange layer group 7, an external heat exchange pipe 5, two sets of fan groups, an air deflector 15, a rod 18, a swing transmission member 19 and a transmission rod 20; the heat dissipation battery box 3 includes four sides, namely a first side shell, a second side shell, a third side shell and a fourth side shell; the first side shell and the third side shell are opposite sides, and the second side shell and the fourth side shell are opposite sides. This embodiment is based on Figure 1 The side of the device shown in the figure that includes the external heat exchange pipe 5 is used as the first side shell, and rotating clockwise, the second side shell, the third side shell and the fourth side shell are determined in sequence.

[0036] The external heat exchange pipe 5 is symmetrically installed at the lower end of the first side shell and the third side shell of the heat dissipation battery box 3; the rectangular heat exchange layer group 4 includes at least two or more rectangular heat exchange layers 7, and the rectangular heat exchange layer 7 is installed at the bottom of the heat dissipation battery box 3, and a gap is left between two adjacent rectangular heat exchange layers 7; the battery 8 is installed in the gap; the shell of the rectangular heat exchange layer 7 adopts a composite material layer 10, and the interior of the rectangular heat exchange layer 7 is a four-layer evenly distributed hollow pipe 9, and the interior of the hollow pipe 9 is installed with a tapered corrugated bond 21.

[0037] like Figure 3-4As shown, the tapered corrugated ties 21 in this embodiment are made based on the structure of cuttlefish fins, and are set so that the amplitude gradually expands from zero at the center to the two ends of the belt, presenting a shape with a small middle and large ends. When the cooling water passes through the hollow pipe 9, the tapered corrugated ties 21 inside will change the path of the cooling water flow, so that the cooling water generates eddies during the flow process, reducing the flow resistance caused by the amplitude, and fully mixing and stirring the cooling water by destroying the boundary layer, thereby increasing the transfer of heat inside the cooling water, avoiding the temperature stratification phenomenon of low temperature in the middle of the cooling water and high temperature on the outer surface, and enhancing the heat absorption capacity of the cooling water.

[0038] The composite material layer 10 is composed of an internal heat spreader 11, a middle thermal conductive silicone layer 12 and an external BNNS boron nitride nanocomposite layer film 13. Generally, the thermal conductivity of a single polymer material is low. There are two main ways to improve the thermal conductivity of polymers. One is to improve the intrinsic thermal conductivity of the polymer by changing the structure and arrangement of the polymer chain. Another feasible way to improve the thermal conductivity of the polymer is to introduce fillers with high thermal conductivity. In theory, the higher the filler filling rate, the better the overall thermal conductivity of the material. Normally, the thermal conductivity can only be significantly improved when the filling amount is higher than 50% (vol); however, such a high amount of filler added often leads to defects such as the material being susceptible to thermal cracking and weakened impact and tensile strength.

[0039] BNNS has many excellent properties such as high dielectric strength, low thermal expansion coefficient, high thermal stability and high chemical stability; its in-plane thermal conductivity can reach up to 6000W (m·K)-1; the use of high-quality nano-scale BNNS can effectively reduce the filling amount and solve the problem of poor performance caused by high addition. The composite fiber membrane of polyvinyl alcohol (PVA) and BNNS was prepared by electrospinning, and then the composite fiber membrane was rolled to form a cylinder and impregnated with polydimethylsiloxane under vacuum to obtain a porous cylindrical flexible polymer nanocomposite. At a BNNS loading of 15.6% (vol), the nanocomposite not only shows ultra-high thermal conductivity, but also shows excellent electrical insulation.

[0040] The first box body 40 is externally connected to the lower end of the fourth side shell of the heat dissipation battery box 3, and the first water pump 61 is installed at the bottom of the first box body 40; the first water tank 41 is externally connected to the side of the first box body 40 relative to the fourth side shell, and a first reserved opening is set on the side where the first box body 40 and the first water tank 41 are connected; the refrigerator 38 is installed at the upper end of the first water tank 41 and the first box body 40, and the refrigerator 38 and the first water pump 61 are both provided with a water inlet and a water outlet; the first water tank 41 is provided with two openings relative to the side of the fourth side shell, and is respectively connected to the water inlet and the water outlet of the refrigerator 38 through a pipe 44; an opening is provided on the side of the first water tank 41 on the same side as the first side shell; the water inlet of the first water pump is connected to the first reserved opening through a pipe; wherein the pipe used by the first water pump is the same pipe as the pipe 44. Among them, the first water pump 61 and the first water tank 41 are used in the process of dissipating heat from the battery 8.

[0041] The external heat dissipation pipe 5 is a four-layer three-branch pipe. The four-layer three-branch pipe outside the first side shell converges on the side close to the first water tank and communicates with the opening on the same side of the first water tank 41; the four-layer three-branch pipe outside the third side shell converges on the side close to the first water tank 41 and communicates with the water outlet of the first water pump 61 through the shell of the first box body 40. Among them, after the four-layer three-branch pipe outside the first side shell converges, it communicates with the opening on the same side of the first water tank 41 at a lower position; after the four-layer three-branch pipe outside the third side shell converges, it communicates with the water outlet of the first water pump 61 through the shell of the first box body 40 near the middle position.

[0042] The rectangular heat exchange layer 7 is provided with four openings on the two side surfaces on the same side as the first side shell and the third side shell, and the position of each opening corresponds to the hollow pipe 9 inside the rectangular heat exchange layer 7; an equal number of openings are provided at positions corresponding to the openings of the rectangular heat exchange layer 7 on the first side shell and the third side shell of the heat dissipation battery box 3; the external heat dissipation pipe 5 is connected with the openings of the rectangular heat exchange layer 7 through the openings on the surfaces of the first side shell and the third side shell of the heat dissipation battery box 3.

[0043] During the operation of the device, the first water pump 61 draws cooling water from the first water tank 41 through the water inlet hole, inputs it into the external heat dissipation pipe 5 outside the third side shell through the water outlet hole, and transmits the cooling water to the four-layer three-pronged pipe through the characteristic of the three-pronged pipe. The cooling water is then input into the four-layer hollow pipe 9 inside the rectangular heat exchange layer 7, and the flow of cooling water is controlled by the tapered corrugated link 21 to achieve cooling of the battery; then the cooling water after absorbing heat is transmitted to the external heat dissipation pipe 5 outside the first side shell, and then transported to the first water tank 41; at the same time, the refrigerator 38 uses the pipe to cool the cooling water in the first water tank 41.

[0044] Through the above device and operation mode, the battery can be effectively liquid-cooled; at the same time, considering that the charging and discharging performance of new energy vehicle batteries will decrease in low temperature environments, when the power released by the battery is not enough to reach the power consumption of the starter, the car is difficult to start, resulting in a decrease in speed, and the piston cannot be driven, resulting in starting difficulties; so we draw on the principle of the PTC heater of fuel vehicles and install a PTC heater 39 on a side of the first water tank 41 to heat the water in the first water tank 41 in a low temperature environment, and then use the heated water to increase the temperature of the battery during operation, thereby solving the problem of the car being unable to start; and the PTC heater 39 can be powered by installing a battery or connecting a car battery.

[0045] The second side shell of the heat dissipation battery box 3 is connected to the second box body 42, and the second water pump 62 is installed at the bottom of the second box body 42; the second water tank 43 is connected to the side of the second box body 42 relative to the second side shell, and a second reserved opening is set on the side where the second box body 42 and the second water tank 43 are connected, and a third reserved opening is set on the side where the second box body 42 and the second side shell are connected; the second water pump 62 is provided with a water inlet and a water outlet, the water inlet is connected to the second reserved opening through a pipe, and the water outlet is connected to the third reserved opening through a pipe. The second water pump 62 and the second water tank 43 are used to extinguish the battery pack when a fire occurs in the battery. The first water pump 61 and the second water pump 62 used are 36V, moderate in volume and efficiency, and stable pumping force water pumps; and the refrigerator 38 is no longer limited here, and can be selected according to different performance and conditions.

[0046] like Figure 1 As shown, two groups of fans are symmetrically distributed on the top outside the second side shell and the fourth side shell of the heat dissipation battery box 3; the swing transmission member 19 is symmetrically distributed on the upper end outside the first side shell and the third side shell, and the transmission rod 20 is symmetrically distributed on the lower end of the swing transmission member 19 on the first side shell and the third side shell, and is connected to the swing transmission member 19; the rod member 18 is installed at the upper end inside the heat dissipation battery box 3, and the two ends of the rod member 18 are connected to the swing transmission member 19 on the first side shell and the third side shell; the air deflector 15 is distributed in an array on the rod member 18.

[0047] Among them, the number, structure and other conditions of the fans 14 in the two fan groups are the same, and a detachable filter housing 16 is also installed on the surface of the fan 14; at the same time, the fan 14 and the filter housing 16 can be fixed on the first side housing and the third side housing by screws 17; the shape of the air deflector 15 is set as a wing structure, which can more conveniently control the flow direction of the air. A groove is set on the surface of the transmission rod 20, and the swing transmission member 19 is connected to the groove through a connecting rod; at the same time, a motor is installed on one side of the transmission rod 20 to control the rotation of the transmission rod 20; the motor can also be powered by installing a battery or connecting a car battery. A through hole is opened at the position corresponding to the heat dissipation battery box 3 and the two fan groups, which is used for the fan to transmit the external cold air to the inside of the heat dissipation battery box 3; and the area between the battery group and the rod 18 is a hollow area.

[0048] During the operation of the device, the transmission rod 20 controls the rotation of the swing transmission member 19 by rotating, thereby controlling the rotation of the rod body 18. The rotation of the rod body 18 will drive the change of the angle of the air deflector 15, and flip it at a certain angle, so as to control the flow direction of the cold air around the heat dissipation battery box. By controlling the wing-shaped air deflector 15, the cold air around the heat dissipation battery box 3 and the internal hot air can be disturbed, so that a low-pressure area is formed above the center of the heat dissipation battery box 3, while the pressure around it is relatively high, thereby accelerating the circulation of air, accelerating the replacement of the internal hot air, and improving the cooling efficiency of the battery pack by air cooling.

[0049] When the present embodiment is in use, the heat dissipation battery box 3 can be set as an integrated structure or a detachable structure. When it is set as a detachable structure, the two sets of fan groups, the air deflector 15, the rod 18, the swing transmission member 19 and the transmission rod 20 are assembled into an integrated structure, and the battery 8, the rectangular heat exchange layer group 4, and the external heat exchange pipe 5 are assembled into another integrated structure; when installing and replacing the battery, the integrated structure composed of the two sets of fan groups, the air deflector 15, the rod 18, the swing transmission member 19 and the transmission rod 20 is disassembled to achieve the installation and replacement of the battery. When it is set as an integrated structure, when installing or replacing the battery, the rod body 18 is disassembled, and then the battery 8 is installed between the two rectangular heat exchange layers 7 to achieve the replacement of the battery.

[0050] In addition, the second box body 42 and the second water tank 43 outside the second side shell of the heat dissipation battery box 3 can also be set as a single integrated box body 2 and isolated by a partition; at the same time, the first box body 40 and the first water tank 41 connected to the fourth side shell can adopt the same method.

[0051] Embodiment 2, based on embodiment 1, the heat dissipation battery box further includes an intelligent controller 22, and an additional third box 1 is installed on the top of the integrated box 2 to place the intelligent controller 22 and fix it with four screws. At the same time, the third box 1, the second box 42 and the second water tank 43 can be set as the integrated box 2, and the partition is also used for isolation.

[0052] The intelligent controller 22 uses the STC89C52 single-chip microcomputer as the core controller, including a central control part, an input part, a detection part, a display, a transmission part, an alarm part, an output part and a button part. The central control part uses the STC89C52 single-chip microcomputer, obtains the measurement data, processes it internally, and controls the output part 1 (25) and the output part 2 (26); the input part 24 has two interfaces, which are powered by 5V and are responsible for the power supply of the main control board and the load respectively; the detection part is composed of five units: a smoke detection module, a temperature detection module, a flame detection module, a human infrared detection module, and an independent button module. The smoke detection module includes an MQ-2 smoke sensor 29 and an ADC0832 digital-to-analog conversion chip, which can detect the smoke value and convert the analog value of the smoke into a digital value, and transmit it to the STC89C52 single-chip microcomputer for processing. The temperature detection module includes a DS18B20 temperature sensor 27, which can detect the actual temperature inside the heat dissipation battery box and issue an alarm when the temperature exceeds the set threshold. The flame detection module includes a flame detection sensor 28, which can detect whether a fire occurs inside the heat dissipation battery box. The human infrared detection module includes a D203S human infrared sensor 30, which can detect whether a biological body is approaching the heat dissipation battery box. The independent button module includes an independent button 1 (31) for switching interfaces, an independent button 2 (32) for increasing the temperature threshold, an independent button 3 (33) for decreasing the temperature threshold, and an independent button 4 (37) for resetting the main control board. The display and transmission part consists of two units: an LCD1602 display module 23 and an HC-05 Bluetooth module 34. The LCD1602 display module 33 is used to display the measurement values ​​and thresholds of each unit of the input part 25; the HC-05 Bluetooth module 34 is used to connect the main control board and the user's mobile device, transmit the measurement values ​​of each unit of the input part 24 to the user's mobile device in real time, and send alarm information to the user's device through the module, and display it on the user's mobile device. In addition, the user's mobile device can control the switches of the water pump and fan and choose whether to turn on the automatic detection mode. The alarm part includes an LED 35 and a buzzer 36, which are responsible for sound and light alarms when abnormal conditions are found in each detection unit. Output part 1 (25) is a fire extinguishing relay, and output part 2 (26) is a fan relay. When an open fire is detected, the fire extinguishing relay is closed, and the second water pump is used to extinguish the fire of the heat dissipation battery box 3; when the temperature or smoke concentration is too high, the fan relay is closed, and the working power of the peripheral load fan 14 is increased to ventilate the heat dissipation battery box 3.

[0053] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A heat dissipation device for a lithium-ion battery pack, characterized in that: It includes a heat dissipation battery box, a battery, a rectangular heat exchange layer group, an external heat exchange pipe, two sets of fan groups, an air guide plate, a rod, a swing transmission member and a transmission rod; the heat dissipation battery box includes four sides, namely a first side shell, a second side shell, a third side shell and a fourth side shell; the first side shell and the third side shell are opposite sides, and the second side shell and the fourth side shell are opposite sides; The external heat exchange pipe is symmetrically installed at the lower end of the first side shell and the third side shell of the heat dissipation battery box; the rectangular heat exchange layer group includes at least two or more rectangular heat exchange layers, and the rectangular heat exchange layer is installed at the bottom of the heat dissipation battery box, and a gap is left between two adjacent rectangular heat exchange layers; the battery is installed in the gap; the shell of the rectangular heat exchange layer adopts a composite material layer, and the interior of the rectangular heat exchange layer is a four-layer hollow pipe with uniform distribution, and the interior of the hollow pipe is installed with a tapered corrugated tie; The two groups of fans are symmetrically distributed on the top outside the second side shell and the fourth side shell of the heat dissipation battery box; the swing transmission parts are symmetrically distributed on the upper ends outside the first side shell and the third side shell, and the transmission rods are symmetrically distributed on the lower ends of the swing transmission parts on the first side shell and the third side shell, and are connected to the swing transmission parts; the rod is installed at the upper end inside the heat dissipation battery box, and the two ends of the rod are connected to the swing transmission parts on the first side shell and the third side shell; the air deflectors are distributed in an array on the rod.

2. A heat dissipation device for a lithium-ion battery pack as claimed in claim 1, characterized in that: The lower end of the fourth side shell of the heat dissipation battery box is connected to the first box body, and a first water pump is installed at the bottom of the first box body; the first water tank is connected to the side of the first box body relative to the fourth side shell, and a first reserved opening is provided on the side where the first box body and the first water tank are connected; a refrigerator is installed at the upper ends of the first water tank and the first box body, and the refrigerator and the first water pump are both provided with a water inlet hole and a water outlet hole; two openings are provided on the side of the first water tank relative to the fourth side shell, which are respectively connected to the water inlet hole and the water outlet hole of the refrigerator through pipes; an opening is provided on the side of the first water tank on the same side as the first side shell; the water inlet hole of the first water pump is connected to the first reserved opening through a pipe.

3. A heat dissipation device for a lithium-ion battery pack as claimed in claim 1, characterized in that: The second side shell of the heat dissipation battery box is connected to the second box body, and a second water pump is installed at the bottom of the second box body; a second water tank is connected to the side of the second box body relative to the second side shell, a second reserved opening is set on the side where the second box body is connected to the second water tank, and a third reserved opening is set on the side where the second box body is connected to the second side shell; the second water pump is provided with a water inlet and a water outlet, the water inlet is connected to the second reserved opening through a pipe, and the water outlet is connected to the third reserved opening through a pipe.

4. A heat dissipation device for a lithium-ion battery pack as claimed in claim 1, characterized in that: The external heat dissipation pipe is a four-layer three-branch pipe. The four-layer three-branch pipe outside the first side shell is converged on the side close to the first water tank and is connected to the opening on the same side of the first water tank; the four-layer three-branch pipe outside the third side shell is converged on the side close to the first water tank and is connected to the water outlet of the first water pump through the shell of the first box body.

5. A heat dissipation device for a lithium-ion battery pack as claimed in claim 1, characterized in that: The rectangular heat exchange layer is respectively provided with four openings on the two side surfaces on the same side as the first side shell and the third side shell, and the position of each opening corresponds to the hollow pipe inside the rectangular heat exchange layer; an equal number of openings are provided at the positions of the first side shell and the third side shell of the heat dissipation battery box corresponding to the openings of the rectangular heat exchange layer; the external heat dissipation pipe is connected with the openings of the rectangular heat exchange layer through the openings on the surfaces of the first side shell and the third side shell of the heat dissipation battery box.

6. A heat dissipation device for a lithium-ion battery pack as claimed in claim 1, characterized in that: The tapered corrugated bond has a cuttlefish fin structure, and is configured such that the amplitude gradually expands from zero at the center toward both ends of the bond, presenting a shape that is small in the middle and large at both ends.

7. A heat dissipation device for a lithium-ion battery pack as claimed in claim 1, characterized in that: The composite material layer consists of an internal heat spreader, a middle heat conductive silica gel layer and an external BNNS boron nitride nanocomposite layer film.

8. A heat dissipation device for a lithium-ion battery pack as claimed in claim 1, characterized in that: The air deflector has an outer shape configured as a wing structure.

9. A heat dissipation device for a lithium-ion battery pack as claimed in claim 1, characterized in that: The fan group includes at least two fans, and the structures and numbers of the fans in the two fan groups are completely the same.

10. A heat dissipation device for a lithium-ion battery pack as claimed in claim 9, characterized in that: A detachable filter housing is arranged outside the fan.

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