A heat dissipation device for cylindrical lithium batteries of new energy vehicles

Abstract

The present invention proposes a heat dissipation device for cylindrical lithium batteries in new energy vehicles, belonging to the field of new energy vehicle technology. The device solves the problems of low space utilization, low heat dissipation efficiency, susceptibility to external conditions, and complex maintenance of existing heat dissipation devices for cylindrical lithium batteries in automobiles. The device comprises a support frame, a spiral double tube, and a battery sleeve. Several battery sleeves are arranged inside the support frame, and cylindrical lithium-ion batteries are arranged inside the battery sleeves. The spiral double tube is wound around two adjacent battery sleeves, and coolant is arranged inside the spiral double tube. One end of the spiral double tube is a liquid inlet, and the other end is a liquid outlet. A liquid inlet channel and a liquid outlet channel are opened inside the support frame. The liquid inlet is connected to the liquid inlet channel, and the liquid outlet is connected to the liquid outlet channel. Heat dissipation material is arranged in the gap between the support frame and the battery sleeve. The device is mainly used for heat dissipation of cylindrical lithium-ion batteries in automobiles.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicles, and in particular relates to a heat dissipation device for a cylindrical lithium battery of a new energy vehicle. Background Art

[0002] A battery heat dissipation device for new energy vehicles (NEVs) is a device used to reduce battery temperature. Due to the high thermal efficiency of NEV battery packs and the limited space in the battery compartment, the batteries generate significant heat during charging and discharging. If the battery temperature is too high and the heat cannot be dissipated promptly, it can seriously affect the battery's performance, shorten its service life, and even lead to accidents that threaten personal safety. With the increasing popularity of electric vehicles, the issue of battery heat dissipation is becoming increasingly important.

[0003] Currently, mainstream cooling technologies for new energy vehicle batteries include air cooling and heat pipe cooling. Air cooling primarily consists of a fan, heat sink, and heat shield. The working principle is that a fan blows air toward the radiator, creating an airflow that removes heat. While the overall structure is relatively simple and cost-effective, it also has significant drawbacks: relying on air for heat dissipation results in low thermal efficiency and is susceptible to environmental influences. Given this drawback of relying on air as a medium for heat dissipation, increasing the number of fans or using thermally conductive silicone sheets is not an effective solution.

[0004] Currently, there is no comprehensive and systematic solution to the above-mentioned problems. Prior art CN 115986301 A, "A New Energy Battery Heat Dissipation Device," discloses a method of dividing a heat exchanger into equally spaced chambers by installing partitions. This method effectively controls the heat dissipation of the battery, reduces the distance traveled by the coolant, and achieves more uniform heat dissipation. However, its overall structure is relatively unstable, and the external pipe body is less secure and susceptible to interference from the external environment. Prior art CN 219575746 U, "A New Energy Vehicle Battery Heat Dissipation and Dust-Proofing Mechanism," discloses a method of transporting coolant from an external coolant tank into a circulation pipe by installing a new liquid pump, absorbing the heat generated by the operating battery pack and transporting it along with the coolant to the interior of the heat exchanger for circulation and heat dissipation. However, this method uses heat dissipation plates and heat dissipation pipes, which takes up a large amount of space, is complex in structure, and is difficult to maintain and clean. Furthermore, the internal heat dissipation of the device is uneven, resulting in poor heat dissipation in high summer temperatures and significant external influences. The prior art CN 116646646 A "A Flat-Plate Battery Box" discloses that multiple three-way pipes are arranged on the outside of the battery box and connected to several heat dissipation pipes above the liquid cooling plate. The air discharged from the air holes acts on the battery, thereby increasing the air flow rate around the battery. At the same time, the heat generated on the liquid cooling plate is also discharged into the heat pipe in the form of hot air, thereby improving the heat dissipation effect of the battery. The heat dissipation of this device is heat pipe air cooling, which has the advantages of strong reliability and low maintenance cost. However, the device increases the efficiency of hot air exhaust by arranging several heat pipes on the liquid cooling plate, which occupies a large area. At the same time, the heat dissipation effect of heat pipe air cooling is easily affected by environmental factors, so temperature control is relatively difficult. The prior art CN 217933974 U "A heat dissipation mechanism for new energy vehicle battery management" discloses that a battery box is provided with multiple groups of mounting holes running through its height on the end face, and two adjacent groups of mounting holes are connected by connecting holes. Among the multiple groups of mounting holes, one group of mounting holes is a water inlet hole, the other group of mounting holes is a water outlet hole, and battery cells are installed in the remaining mounting holes for battery heat dissipation. The battery cells are cooled by circulating water cooling. Under normal circumstances, effective heat dissipation can be achieved. However, due to the problem of insufficient contact between the heat pipe and the battery, when the temperature is high and the battery temperature is high, the heat dissipation of the battery is still insufficient. In addition, due to the unidirectionality of the pipe body, there is a temperature difference between the liquid inlet and the liquid outlet. In summary, how to design a battery heat dissipation device that has high heat dissipation efficiency, is less affected by external environmental factors, is highly safe, and has high and uniform heat dissipation efficiency is a key issue currently being addressed. Summary of the Invention

[0005] In view of this, the present invention aims to propose a heat dissipation device for cylindrical lithium batteries of new energy vehicles to solve the problems of low space utilization, low heat dissipation efficiency, susceptibility to external conditions and complex maintenance of existing automotive cylindrical lithium battery heat dissipation devices.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a heat dissipation device for cylindrical lithium batteries of new energy vehicles, which includes a support frame, a spiral double tube and a battery sleeve, a plurality of battery sleeves are arranged inside the support frame, and a cylindrical lithium-ion battery is arranged in the battery sleeve, the spiral double tube is wrapped around two adjacent battery sleeves, and the spiral double tube has a cooling channel, and coolant flows in the cooling channel. One end of the spiral double tube is a liquid inlet, and the other end is a liquid outlet. A liquid inlet channel and a liquid outlet channel are opened inside the support frame, the liquid inlet is connected to the liquid inlet channel, and the liquid outlet is connected to the liquid outlet channel. The cross-section of the spiral double tube is elliptical, the spiral double tube is made of copper material, and a heat dissipation material is arranged in the gap between the support frame and the battery sleeve, and the heat dissipation material is made of phase change material.

[0007] Furthermore, the support frame includes an upper cover, a side plate and a bottom plate, the side plate is arranged along the circumferential direction, the upper and lower ends of the side plate are respectively connected to the upper cover and the bottom plate, the upper and lower ends of the battery sleeve are respectively connected to the upper cover and the bottom plate, and a liquid inlet channel and a liquid outlet channel are set on the bottom plate.

[0008] Furthermore, the bottom plate includes an upper bottom plate and a lower bottom plate, the upper bottom plate is arranged above the lower bottom plate, and grooves are correspondingly arranged on the bottom surface of the upper bottom plate and the top surface of the lower bottom plate. After the upper bottom plate and the lower bottom plate are connected, the grooves are docked to form a liquid inlet channel and a liquid outlet channel, and the liquid inlet channel and the liquid outlet channel are arranged adjacent to each other.

[0009] Furthermore, the liquid inlet channel includes a liquid inlet main channel and several liquid inlet branch channels, the liquid inlet main channel is connected to the several liquid inlet branch channels, the liquid outlet channel includes a liquid outlet main channel and several liquid outlet branch channels, the liquid outlet main channel is connected to the several liquid outlet branch channels, the top of the liquid inlet branch channel is connected to the liquid inlet pipe port, and the top of the liquid outlet branch channel is connected to the liquid outlet pipe port.

[0010] Furthermore, a liquid inlet is provided on the liquid inlet main channel, and a liquid outlet is provided on the liquid outlet main channel, and both the liquid inlet and the liquid outlet are connected to the outside.

[0011] Furthermore, a plurality of small holes are provided on the upper base plate, and the liquid inlet and liquid outlet are connected to the liquid inlet branch channel and the liquid outlet branch channel respectively through the small holes.

[0012] Furthermore, the upper base plate and the lower base plate are clamped by a second clamping bolt.

[0013] Furthermore, the upper cover is connected to the side panel via a first clamping bolt.

[0014] Furthermore, adjacent cylindrical lithium-ion batteries are sequentially connected in series through positive and negative electrode conduction paths.

[0015] Furthermore, the upper cover is provided with multiple rows of through holes at equal intervals, the positive electrode of the cylindrical lithium-ion battery is arranged in the through hole, a conductive material is arranged in the battery sleeve, the conductive material is connected to the negative electrode of the cylindrical lithium-ion battery, the conductive material extends to the upper end of the battery sleeve, and the positive and negative electrode guides are connected in series with the positive and negative electrodes of adjacent cylindrical lithium-ion batteries in sequence.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The heat dissipation medium of the present invention is coolant, which is not easily affected by the external environment. By adopting a spiral double tube, the volume of the heat dissipation tube body is reduced. The elliptical cross-section of the spiral double tube can increase the heat dissipation area per unit volume while further enhancing the heat transfer efficiency;

[0018] 2. When the coolant of the present invention flows through the spiral double tubes, relative convection is formed. When flowing through the spiral pipes, secondary flow is formed under the action of centrifugal force, which enhances heat transfer. At the same time, the filling of the phase change material between the gaps improves stability and safety in the solid state. The phase change material directly participates in heat transfer in the liquid state, and the tube body forms physical vibration heat transfer, further improving heat transfer efficiency.

[0019] 3. In the present invention, multiple spiral double tubes are placed alternately, which reduces the volume of the device, reduces the space occupied, makes the device more compact, and improves the utilization rate of the device space;

[0020] 4. This invention separates the cylindrical lithium-ion batteries by providing a battery sleeve and connects the positive and negative electrodes via positive and negative conductors, making battery removal and installation more flexible and improving safety. The spiral double tube and phase change material make the device more compact and stable, and enhance safety in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the axial structure of a heat dissipation device for a cylindrical lithium battery in a new energy vehicle according to the present invention;

[0023] Figure 2 This is a schematic diagram of the partial structure of a heat dissipation device for a cylindrical lithium battery in a new energy vehicle according to the present invention;

[0024] Figure 3 A perspective view of a bottom plate of a heat dissipation device for cylindrical lithium batteries of new energy vehicles according to the present invention;

[0025] Figure 4This is a schematic diagram of the bottom surface structure of the upper base plate of a heat dissipation device for cylindrical lithium batteries in new energy vehicles according to the present invention;

[0026] Figure 5 This is a schematic diagram of the top structure of the lower base plate of a heat dissipation device for cylindrical lithium batteries in new energy vehicles according to the present invention;

[0027] Figure 6 This is a schematic diagram of the upper cover structure of a heat dissipation device for a cylindrical lithium battery in a new energy vehicle according to the present invention;

[0028] Figure 7 This is a schematic structural diagram of a spiral double-tube heat dissipation device for cylindrical lithium batteries in new energy vehicles according to the present invention;

[0029] Figure 8 This is a structural schematic diagram of a battery sleeve of a heat dissipation device for a cylindrical lithium battery in a new energy vehicle according to the present invention.

[0030] In the picture:

[0031] 1. Positive and negative electrode guides; 2. First clamping bolt; 3. Second clamping bolt; 4. Liquid inlet; 5. Liquid outlet; 6. Liquid inlet main channel; 7. Liquid outlet main channel; 8. Liquid inlet branch channel; 9. Liquid outlet branch channel; 10. Small hole; 11. Liquid inlet pipe port; 12. Liquid outlet pipe port; 13. Spiral double tube; 14. Heat dissipation material; 15. Lower base plate; 16. Upper base plate; 17. Cylindrical lithium-ion battery; 18. Battery sleeve; 19. Upper cover. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features therein can be combined with each other in the absence of conflict, and the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0033] See also Figure 1-8Describe this embodiment, a heat dissipation device for cylindrical lithium batteries of new energy vehicles, which includes a support frame, a spiral double tube 13 and a battery sleeve 18. Several battery sleeves 18 are arranged inside the support frame, and cylindrical lithium-ion batteries 17 are arranged in the battery sleeve 18. The spiral double tube 13 is wrapped around two adjacent battery sleeves 18, and the support frame plays a sealing role. The spiral double tube 13 has a cooling channel, and coolant flows in the cooling channel. The coolant plays a role in dissipating heat inside the device. The cross-section of the spiral double tube 13 is elliptical. The elliptical cross-section increases the contact area between the pipe and the battery, which is beneficial to heat transfer. One end of the spiral double tube 13 is a liquid inlet 11, and the other end is a liquid outlet 12. A liquid inlet channel and a liquid outlet channel are opened inside the support frame. The liquid inlet 11 is connected to the liquid inlet channel, and the liquid outlet 12 is connected to the liquid outlet channel. The coolant enters the spiral double tube 13 from the liquid inlet 11 through the liquid inlet channel. Inside the tube 13, liquid flows into the liquid outlet channel through the liquid outlet port 12 of the spiral double tube 13, and is finally dissipated to the outside of the device in the form of coolant fluid. The spiral double tube 13 is made of copper material. The spiral double tube 13 is used to dissipate heat for the cylindrical lithium-ion battery 17. The spiral double tube 13 is made of copper material. The use of the spiral double tube 13 made of copper improves the heat conductivity. A heat dissipation material 14 is provided in the gap between the support frame and the battery sleeve 18. The heat dissipation material 14 is used to further dissipate heat inside the heat dissipation device. The heat dissipation material 14 provided in the gap between the support frame and the battery sleeve 18 plays a role in improving the stability and safety of the device, and is fireproof, explosion-proof and waterproof. The heat dissipation material 14 is made of phase change material. The heat dissipation material 14 is made of phase change material. The phase change material is 46 paraffin. The melting point of 46 paraffin is 27.4°C, the latent heat of fusion L is 244kJ / kg, and the density ρs of solid paraffin is 770kg / m 3 When the temperature reaches 27.4℃, paraffin changes from solid to liquid, absorbing heat during the melting process.

[0034] The present invention arranges the cylindrical lithium-ion battery 17 on the outside of the battery sleeve 18, and the spiral double tubes 13 are wound around the outside of the two adjacent battery sleeves 18. A cylindrical lithium-ion battery 17 is placed in each battery sleeve 18, and a maximum of two battery sleeves 18 are arranged in each spiral double tube 13. Several spiral double tubes 13 are placed crosswise, thereby improving the utilization of space. The coolant arranged in the cooling channel of the spiral double tube 13 can dissipate heat for the cylindrical lithium-ion battery 17 in the battery sleeve 18. The coolant enters the cooling channel through the liquid inlet channel and the liquid inlet pipe port 11, and flows to the liquid outlet channel through the liquid outlet pipe port 12. The support frame and the battery The heat dissipation material 14 provided in the battery sleeve 18 can ensure the stability of the heat dissipation device while dissipating heat, thereby improving the safety of the heat dissipation device. When the phase change material is solid, the phase change material ensures the stability of the heat dissipation device. When the temperature in the heat dissipation device reaches the melting point of the phase change material, the phase change material melts from solid to liquid, and absorbs the heat generated by the columnar lithium-ion battery 17 during the melting process. When the phase change material is in liquid state, it directly participates in the heat dissipation process. At the same time, due to the gap between the spiral double tube 13 and the battery sleeve 18, physical vibration will be generated during the melting process of the phase change material, thereby further improving the heat dissipation effect.

[0035] The support frame includes an upper cover 19, a side plate and a bottom plate. The side plate is arranged along the circumference, and the support frame is used to achieve sealing of the device to prevent the heat dissipation material 14 from leaking out. The upper and lower ends of the side plate are respectively connected to the upper cover 19 and the bottom plate, and the upper and lower ends of the battery sleeve 18 are respectively connected to the upper cover 19 and the bottom plate. The upper end of the battery sleeve 18 is tightly fitted with the lower surface of the upper cover 19, which plays a role in fixing the battery sleeve 18. At the same time, the upper and lower ends of the side plate can be tightly fitted with the upper cover 19 and the bottom plate to prevent the internal heat dissipation material 14 from leaking out, thereby improving the stability and safety of the heat dissipation device. A liquid inlet channel and a liquid outlet channel are provided on the bottom plate for the circulation of cooling liquid.

[0036] The base plate includes an upper base plate 16 and a lower base plate 15. The upper base plate 16 is arranged above the lower base plate 15. The bottom surface of the upper base plate 16 and the top surface of the lower base plate 15 are correspondingly provided with grooves. After the upper base plate 16 and the lower base plate 15 are connected, the grooves are docked to form a liquid inlet channel and a liquid outlet channel. The liquid inlet channel and the liquid outlet channel are used for the flow of coolant to realize the heat transfer of the cylindrical lithium-ion battery 17. The liquid inlet channel and the liquid outlet channel are adjacently arranged, and the coolant in the liquid inlet channel and the liquid outlet channel is relatively convective to realize convective heat dissipation, which can further enhance the heat dissipation efficiency.

[0037] The liquid inlet channel includes a liquid inlet main channel 6 and several liquid inlet branch channels 8, the liquid inlet main channel 6 is connected to the several liquid inlet branch channels 8, the liquid outlet channel includes a liquid outlet main channel 7 and several liquid outlet branch channels 9, the liquid outlet main channel 7 is connected to the several liquid outlet branch channels 9, the top of the liquid inlet branch channel 8 is connected to the liquid inlet pipe port 11, and the top of the liquid outlet branch channel 9 is connected to the liquid outlet pipe port 12. The coolant on the liquid inlet main channel 6 flows to the several liquid inlet branch channels 8, and the coolant on the liquid inlet branch channel 8 flows to the inside of the spiral double tube 13 through the liquid inlet pipe port 11. The coolant in the spiral double tube 13 flows to the several liquid outlet branch channels 9 through the liquid outlet pipe port 12, and the coolant on the several liquid outlet branch channels 9 converges into the liquid outlet main channel 7.

[0038] A liquid inlet 4 is provided on the liquid inlet main channel 6, and a liquid outlet 5 is provided on the liquid outlet main channel 7. Both the liquid inlet 4 and the liquid outlet 5 are connected to the outside world. The coolant flows into the liquid inlet main channel 6 through the liquid inlet 4, and the coolant on the liquid inlet branch channel 8 flows into the spiral double tube 13 through the liquid inlet pipe port 11. The coolant in the spiral double tube 13 flows to several liquid outlet branch channels 9 through the liquid outlet pipe port 12. The coolant on several liquid outlet branch channels 9 converges on the liquid outlet main channel 7 and flows out of the heat dissipation device through the liquid outlet 5, thereby achieving heat dissipation through heat transfer of the coolant.

[0039] Several small holes 10 are provided on the upper base plate 16, and the liquid inlet pipe port 11 and the liquid outlet pipe port 12 are respectively connected to the liquid inlet branch channel 8 and the liquid outlet branch channel 9 through the small holes 10. The coolant in the liquid inlet branch channel 8 is transported to the spiral double tube 13 through the small holes 10 on the upper base plate 16, and the coolant in the spiral double tube 13 flows into the liquid outlet branch channel 9 through the small holes 10.

[0040] The upper base plate 16 and the lower base plate 15 are clamped by the second clamping bolts 3 , and a liquid inlet channel and a liquid outlet channel are formed after the upper base plate 16 and the lower base plate 15 are clamped.

[0041] The upper cover 19 is connected to the side plate through the first clamping bolt 2, and the sealing of the device is achieved by connecting the upper cover 19 and the side plate through the first clamping bolt 2.

[0042] The adjacent cylindrical lithium-ion batteries 17 are connected in series in sequence through the positive and negative electrode guides 1. The positive and negative electrode guides 1 are used to connect several cylindrical lithium-ion batteries 17 into a battery pack, making battery disassembly and installation more flexible and improving safety in use.

[0043] The upper cover 19 is provided with multiple rows of through holes at equal intervals, and the positive electrode of the cylindrical lithium-ion battery 17 is arranged in the through hole. A conductive material is arranged in the battery sleeve 18, and the conductive material is connected to the negative electrode of the cylindrical lithium-ion battery 17. The conductive material extends to the upper end of the battery sleeve 18, and the conductive material serves as the negative electrode of the cylindrical lithium-ion battery 17. The positive and negative electrode guides 1 are connected in series with the positive and negative electrodes of adjacent cylindrical lithium-ion batteries 17 in sequence. By using the positive and negative electrode guides 1 to connect several cylindrical lithium-ion batteries 17 into a battery pack, the disassembly and installation of the cylindrical lithium-ion battery 17 are more flexible, and the safety of use is improved.

[0044] The working principle of the heat dissipation of the present invention is as follows: the coolant flows from the liquid inlet 4 into the liquid inlet main channel 6, passes through the small hole 10 on the liquid inlet branch channel 8 on the upper base plate 16 to reach the liquid inlet port 11 of the spiral double tube 13, and flows into the spiral double tube 13 through the liquid inlet port 11. After entering the spiral double tube 13, the coolant forms relative convection due to the elliptical cross section of the spiral double tube 13, and forms a secondary flow under the action of centrifugation, thereby increasing the heat transfer efficiency. The coolant flows into the liquid outlet branch channel 9 through the liquid outlet port 12 of the spiral double tube 13 and the small hole 10 on the upper base plate 16. The coolant on the multiple liquid outlet branches 9 is The coolant is collected on the liquid outlet main channel 7 and flows out of the heat dissipation device from the liquid outlet 5 to achieve heat dissipation; when the cylindrical lithium-ion battery 17 reaches a certain temperature, the heat dissipation material 14 placed in the gap between the battery sleeve 18 and the spiral double tube 13 undergoes a phase transition. In the process of the heat dissipation material 14 changing from solid to liquid, it takes away the heat generated by the battery. When the heat dissipation material 14 is liquid, the heat dissipation material 14 directly participates in the heat transfer process. At the same time, physical vibration is generated between the spiral double tube 13 and the battery sleeve 18 to achieve further heat transfer, thereby further enhancing the heat transfer effect of the coolant.

[0045] The embodiments of the present invention disclosed above are intended only to illustrate the present invention. The embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. A heat dissipation device for cylindrical lithium batteries of new energy vehicles, characterized by: It comprises a support frame, a spiral double tube (13) and a battery sleeve (18), wherein a plurality of battery sleeves (18) are arranged inside the support frame, wherein a columnar lithium-ion battery (17) is arranged inside the battery sleeve (18), wherein the spiral double tube (13) is wound around two adjacent battery sleeves (18), wherein the spiral double tube (13) is a cooling channel, wherein a coolant flows through the cooling channel, wherein one end of the spiral double tube (13) is a liquid inlet (11), and the other end is a liquid outlet (12), wherein the support frame is provided with a plurality of battery sleeves (18), wherein the columnar lithium-ion battery (17) is arranged inside the battery sleeve (18), wherein the spiral double tube (13) is wound around two adjacent battery sleeves (18), wherein the spiral double tube (13) is a cooling channel, wherein a coolant flows through the cooling channel, wherein the spiral double tube (13) is provided with a liquid inlet (11) and a liquid outlet (12), wherein the support frame is provided with a plurality of battery sleeves (18), wherein the columnar lithium-ion battery (17) is arranged inside the battery sleeve (18), wherein the columnar lithium-ion battery (17) is arranged inside the battery sleeve (18), wherein the columnar lithium-ion battery (17) is wound around two adjacent battery sleeves (18), wherein the columnar lithium-ion battery (17) is wound around two adjacent battery sleeves (18), wherein the columnar lithium-ion battery (17) is wound around the columnar lithium-ion battery (17 ... A liquid inlet channel and a liquid outlet channel are provided, the liquid inlet pipe port (11) is connected to the liquid inlet channel, the liquid outlet pipe port (12) is connected to the liquid outlet channel, the cross section of the spiral double tube (13) is elliptical, the spiral double tube (13) is made of copper material, a heat dissipation material (14) is provided in the gap between the support frame and the battery sleeve (18), and the heat dissipation material (14) is made of phase change material; the support frame includes an upper cover (19), a side plate and a bottom plate, the side plate is provided along the circumferential direction, and the side plate The upper and lower ends are connected to the upper cover (19) and the bottom plate respectively. The upper and lower ends of the battery sleeve (18) are connected to the upper cover (19) and the bottom plate respectively. A liquid inlet channel and a liquid outlet channel are provided on the bottom plate. The bottom plate includes an upper bottom plate (16) and a lower bottom plate (15). The upper bottom plate (16) is provided above the lower bottom plate (15). The bottom surface of the upper bottom plate (16) and the top surface of the lower bottom plate (15) are provided with grooves corresponding to each other. After the upper bottom plate (16) and the lower bottom plate (15) are connected, the grooves are connected to form a liquid inlet channel. and a liquid outlet channel, wherein the liquid inlet channel and the liquid outlet channel are arranged adjacent to each other; the liquid inlet channel comprises a liquid inlet main channel (6) and a plurality of liquid inlet branch channels (8), the liquid inlet main channel (6) and the plurality of liquid inlet branch channels (8) are connected, the liquid outlet channel comprises a liquid outlet main channel (7) and a plurality of liquid outlet branch channels (9), the liquid outlet main channel (7) and the plurality of liquid outlet branch channels (9) are connected, the top of the liquid inlet branch channel (8) is connected to the liquid inlet pipe port (11), and the top of the liquid outlet branch channel (9) is connected to the liquid outlet pipe port (12).

2. A heat dissipation device for cylindrical lithium batteries for new energy vehicles according to claim 1, characterized in that: A liquid inlet (4) is provided on the liquid inlet main channel (6), and a liquid outlet (5) is provided on the liquid outlet main channel (7). Both the liquid inlet (4) and the liquid outlet (5) are in communication with the outside.

3. The heat dissipation device for cylindrical lithium batteries of new energy vehicles according to claim 1, characterized in that: A plurality of small holes (10) are provided on the upper base plate (16), and the liquid inlet pipe opening (11) and the liquid outlet pipe opening (12) are respectively connected to the liquid inlet branch channel (8) and the liquid outlet branch channel (9) through the small holes (10).

4. The heat dissipation device for cylindrical lithium batteries of new energy vehicles according to claim 1, characterized in that: The upper base plate (16) and the lower base plate (15) are clamped by a second clamping bolt (3).

5. The heat dissipation device for cylindrical lithium batteries of new energy vehicles according to claim 1, characterized in that: The upper cover (19) is connected to the side plate via a first clamping bolt (2).

6. The heat dissipation device for cylindrical lithium batteries of new energy vehicles according to claim 1, characterized in that: Adjacent columnar lithium-ion batteries (17) are sequentially connected in series via the positive and negative electrode conducting paths (1).

7. A heat dissipation device for cylindrical lithium batteries of new energy vehicles according to claim 6, characterized in that: The upper cover (19) is provided with a plurality of rows of through holes at equal intervals, the positive electrode of the columnar lithium-ion battery (17) is arranged in the through hole, a conductive material is arranged in the battery sleeve (18), the conductive material is connected to the negative electrode of the columnar lithium-ion battery (17), the conductive material extends to the upper end of the battery sleeve (18), and the positive and negative electrode guides (1) are sequentially connected in series with the positive and negative electrodes of adjacent columnar lithium-ion batteries (17).

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