Heat dissipation device for columnar lithium battery of new energy automobile

Abstract

The invention provides a heat dissipation device for a columnar lithium battery of a new energy automobile, and belongs to the technical field of new energy automobiles. The problems that an existing automobile columnar lithium battery heat dissipation device is low in space utilization rate, low in heat dissipation efficiency, prone to being affected by external conditions and complex in maintenance are solved. The device comprises a supporting frame, spiral double pipes and battery sleeves, a plurality of battery sleeves are arranged in the supporting frame, columnar lithium ion batteries are arranged in the battery sleeves, the spiral double pipes are wound on two adjacent battery sleeves, cooling liquid is arranged in the spiral double pipes, one end of each spiral double pipe is a liquid inlet pipe opening, and the other end of each spiral double pipe is a liquid outlet pipe opening. One end of the supporting frame is a liquid inlet pipe opening, the other end of the supporting frame is a liquid outlet pipe opening, a liquid inlet channel and a liquid outlet channel are formed in the supporting frame, the liquid inlet pipe opening is connected with the liquid inlet channel, the liquid outlet pipe opening is connected with the liquid outlet channel, and a heat dissipation material is arranged in a gap between the supporting frame and the battery sleeve. The heat dissipation device is mainly used for heat dissipation of the columnar lithium ion battery of the automobile.

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] The battery heat dissipation device for new energy vehicles is a device used to reduce the battery temperature. Due to the high thermal efficiency of new energy vehicle battery packs and the limited battery box space, the battery will generate a lot of heat during the charging and discharging process. If the battery temperature is too high, the heat cannot be discharged in time, which will seriously affect the performance of the vehicle battery, reduce its service life, and even cause safety accidents that threaten personal safety. With the popularity of electric vehicles, the heat dissipation problem of battery packs has become increasingly important.

[0003] At present, the mainstream new energy vehicle battery cooling technologies mainly include air cooling and heat pipe cooling. Air cooling is mainly composed of fans, heat sinks, heat sinks, etc. The working principle is to blow air to the radiator through the fan to form an airflow, thereby taking away the heat. The overall structure is relatively simple and low-cost, but the disadvantages are also very obvious: due to the reliance on air heat dissipation, the thermal efficiency is low and it is easily affected by the external environment. In view of the disadvantage of relying on air medium to release heat, increasing the number of fans or using thermal conductive silicone sheets cannot effectively solve the problem.

[0004] There is no systematic and comprehensive solution to the above problems. The existing Chinese patent CN115986301A "A new energy battery heat dissipation device" discloses that the heat exchanger is divided into equidistant cavities by setting partitions. This method can effectively control the heat dissipation effect of the battery, reduce the flow of the coolant, and make the heat dissipation more uniform, but its overall structure is relatively unstable, the external pipe body is less safe, and it is easily disturbed by the external environment; Chinese patent CN219575746 U "A new energy vehicle battery heat dissipation and dust prevention mechanism" discloses that the coolant in the external coolant tank is transported to the inside of the circulation pipe by setting a new liquid pump, the heat generated by the working battery pack is absorbed, and the heat is transported to the inside of the heat exchanger with the coolant for circulation and heat dissipation. However, it dissipates heat through the heat dissipation plate heat dissipation pipe, which occupies a large space and has a complex structure, is not easy to repair and clean, and the heat dissipation inside the device is uneven. When the temperature is high in summer, the heat dissipation effect is not good and it is greatly affected by the outside world. Chinese patent CN 116646646 A "A flat battery box" discloses that a plurality of three-way pipes are arranged on the outside of the battery box to connect with a plurality of heat dissipation pipes above the liquid cooling plate. The air discharged from the air holes acts on the battery to increase 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 the device belongs to 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 a number of heat pipes on the liquid cooling plate, and 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; Chinese patent CN 217933974 U "A heat dissipation mechanism for new energy vehicle battery management" discloses that a plurality of groups of mounting holes are opened on the end face of the battery box to penetrate its height, and two adjacent groups of mounting holes are connected by connecting holes. Among the plurality of mounting holes, one group of mounting holes is a water inlet hole, and one group of mounting holes is a water outlet hole. Battery monomers are installed in the remaining mounting holes for battery heat dissipation. The battery monomers are cooled by circulating water cooling. Under normal circumstances, effective heat dissipation can be performed. 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, and due to the unidirectionality of the tube body, there is a temperature difference between the liquid inlet and the liquid outlet. In summary, how to design a battery cooling device with high heat dissipation efficiency, little interference from external environmental factors, high safety, and high and uniform heat dissipation efficiency is the current focus of attention. 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 automobile 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 a cylindrical lithium battery of a new energy vehicle, comprising a supporting frame, a spiral double tube and a battery sleeve, wherein a plurality of battery sleeves are arranged inside the supporting frame, and a cylindrical lithium-ion battery is arranged inside the battery sleeve, the spiral double tube is wound around two adjacent battery sleeves, and the spiral double tube has a cooling channel inside, and a 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 provided inside the supporting 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 an ellipse, the spiral double tube is made of copper material, a heat dissipation material is arranged in the gap between the supporting 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 the bottom plate is provided with a liquid inlet channel and a liquid outlet channel.

[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 connected to form a liquid inlet channel and a liquid outlet channel, and the liquid inlet channel and the liquid outlet channel are 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 arranged on the liquid inlet main channel, and a liquid outlet is arranged 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 arranged on the upper bottom 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 second clamping bolts.

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

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

[0015] Furthermore, the upper cover is provided with multiple rows of through holes at equal intervals, the positive electrode of the columnar 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 columnar 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 columnar 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 a coolant, which is not easily disturbed 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 tube, relative convection is formed. When flowing through the spiral pipe, secondary flow is formed under the action of centrifugal force to enhance heat transfer. At the same time, the filling of the phase change material between the gaps improves the stability and safety of the phase change material in a solid state. The phase change material directly participates in heat transfer in a liquid state, and the tube body forms physical vibration heat transfer, further improving the 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. The present invention separates the columnar lithium-ion battery by setting a battery sleeve, and connects the positive and negative electrodes of the battery through the positive and negative electrode guides, making the battery disassembly and installation more flexible and improving safety. The spiral double tube and phase change material make the device more compact and stable, and improve the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings constituting 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 an improper 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 of a new energy vehicle according to the present invention;

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

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

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

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

[0030] In the figure:

[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 in the upper bottom plate; 11. Liquid inlet pipe opening; 12. Liquid outlet pipe opening; 13. The cross section of the spiral double tube is an ellipse; 14. Phase change material; 15. Lower bottom plate; 16. Upper bottom plate; 17. Columnar lithium-ion battery 17; 18. Battery sleeve; 19. Upper cover. DETAILED DESCRIPTION

[0032] The following will be combined with the 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 in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0033] See also Figure 1-7The present embodiment is described as a heat dissipation device for a cylindrical lithium battery of a new energy vehicle, comprising a support frame, a spiral double tube 13 and a battery sleeve 18. A plurality of battery sleeves 18 are arranged inside the support frame, and a cylindrical lithium-ion battery 17 is arranged inside the battery sleeve 18. The spiral double tube 13 is wound around two adjacent battery sleeves 18, and the support frame plays a sealing role. The spiral double tube 13 has a cooling channel inside, and a 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 an elliptical shape, and the elliptical cross section increases the contact area between the pipeline and the battery, which is beneficial to heat transfer. One end of the spiral double tube 13 is a liquid inlet port 11, and the other end is a liquid outlet port 12. A liquid inlet channel and a liquid outlet channel are opened inside the support frame, and the liquid inlet port 11 is connected to the liquid inlet channel, and the liquid outlet port 12 is connected to the liquid outlet channel. The coolant enters the spiral double tube 13 from the liquid inlet port 11 through the liquid inlet channel. The liquid inside the tube 13 flows into the liquid outlet channel through the liquid outlet port 12 of the spiral double tube 13, and finally radiates 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 columnar lithium-ion battery 17. The spiral double tube 13 is made of copper material. The heat conduction effect is improved by using the spiral double tube 13 made of copper. A heat dissipation material 14 is arranged 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 arranged 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 melting latent heat 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 columnar lithium-ion battery 17 on the outside of the battery sleeve 18, and the spiral double tubes 13 are wound around the outside of two adjacent battery sleeves 18, and a columnar lithium-ion battery 17 is placed in each battery sleeve 18, and at most two battery sleeves 18 are arranged in each spiral double tube 13, and a plurality of spiral double tubes 13 are placed crosswise, thereby improving the utilization rate of space, and the coolant arranged in the cooling channel of the spiral double tube 13 can dissipate heat for the columnar lithium-ion battery 17 in the battery sleeve 18, and 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, and the support frame and the electric The heat dissipation material 14 arranged 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 circumferential direction, and the sealing of the device is achieved through the support frame 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 to fix 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 arranged on the bottom plate for the circulation of cooling liquid.

[0036] The bottom plate includes an upper bottom plate 16 and a lower bottom plate 15, wherein the upper bottom plate 16 is arranged above the lower bottom plate 15, and grooves are arranged correspondingly on the bottom surface of the upper bottom plate 16 and the top surface of the lower bottom plate 15. 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, and the liquid inlet channel and the liquid outlet channel are used for the flow of cooling liquid to realize the heat transfer of the columnar lithium-ion battery 17. The liquid inlet channel and the liquid outlet channel are arranged adjacent to each other, and the cooling liquid 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 a plurality of liquid inlet branches 8, the liquid inlet main channel 6 is connected to the plurality of liquid inlet branches 8, the liquid outlet channel includes a liquid outlet main channel 7 and a plurality of liquid outlet branches 9, the liquid outlet main channel 7 is connected to the plurality of liquid outlet branches 8, the top of the liquid inlet branch channel 8 is connected to the liquid inlet pipe port 11, 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 plurality of liquid inlet branches 8, 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 plurality of liquid outlet branches 9 through the liquid outlet pipe port 12, and the coolant on the plurality of liquid outlet branches 9 converges to the liquid outlet main channel 7.

[0038] A liquid inlet 4 is arranged on the liquid inlet main channel 6, and a liquid outlet 5 is arranged on the liquid outlet main channel 7. Both the liquid inlet 4 and the liquid outlet 5 are connected to the outside. 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 a plurality of liquid outlet branch channels 9 through the liquid outlet pipe port 12. The coolant on the plurality of 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 realizing heat dissipation through heat transfer of the coolant.

[0039] A plurality of 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 88 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 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 bolts 2, and the upper cover 19 and the side plate are connected by the first clamping bolts 2 to achieve sealing of the device.

[0042] The adjacent columnar 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 columnar 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 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, the conductive material serves as the negative electrode of the columnar lithium-ion battery 17, and the positive and negative electrode guides 1 are connected in series with the positive and negative electrodes of adjacent columnar lithium-ion batteries 17 in sequence. By adopting the positive and negative electrode guides 1 to connect several columnar lithium-ion batteries 17 into a battery pack, the disassembly and installation of the columnar 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 bottom 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 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 bottom plate 16. The coolant on the multiple liquid outlet branches 9 The coolant is collected on the main liquid outlet channel 7 and flows out of the heat dissipation device from the outlet 5 to achieve heat dissipation; when the columnar 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, and the heat dissipation material 14 takes away the heat generated by the battery during the process of changing from solid to liquid. When the heat dissipation material 14 is liquid, the heat dissipation material 14 directly participates in the heat transfer process, and 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 only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. A heat dissipation device for a cylindrical lithium battery of a new energy vehicle, characterized in that: It comprises a support frame, a spiral double tube (13) and a battery sleeve (18). A plurality of battery sleeves (18) are arranged inside the support frame. A columnar lithium-ion battery (17) is arranged inside the battery sleeve (18). The spiral double tube (13) is wound around two adjacent battery sleeves (18). A cooling channel is arranged inside the spiral double tube (13). Cooling liquid flows in the cooling channel. 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 provided 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 cross section of the spiral double tube (13) is elliptical. The spiral double tube (13) is made of copper. A heat dissipation material (14) is arranged in the gap between the support frame and the battery sleeve (18). The heat dissipation material (14) is made of phase change material.

2. A heat dissipation device for a cylindrical lithium battery of a new energy vehicle according to claim 1, characterized in that: The support frame comprises an upper cover (19), a side plate and a bottom plate, wherein the side plate is arranged along the circumferential direction, and 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, and a liquid inlet channel and a liquid outlet channel are arranged on the bottom plate.

3. A heat dissipation device for a cylindrical lithium battery of a new energy vehicle according to claim 2, characterized in that: The bottom plate comprises an upper bottom plate (16) and a lower bottom plate (15); the upper bottom plate (16) is arranged above the lower bottom plate (15); grooves are arranged correspondingly on the bottom surface of the upper bottom plate (16) and the top surface of the lower bottom plate (15); after the upper bottom plate (16) and the lower bottom plate (15) are connected, the grooves are butted to form a liquid inlet channel and a liquid outlet channel; the liquid inlet channel and the liquid outlet channel are arranged adjacent to each other.

4. A heat dissipation device for a cylindrical lithium battery of a new energy vehicle according to claim 3, characterized in that: 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 (8) is connected to the liquid outlet pipe port (12).

5. A heat dissipation device for a cylindrical lithium battery of a new energy vehicle according to claim 4, characterized in that: A liquid inlet (4) is arranged on the liquid inlet main channel (6), and a liquid outlet (5) is arranged on the liquid outlet main channel (7), and both the liquid inlet (4) and the liquid outlet (5) are in communication with the outside.

6. A heat dissipation device for a cylindrical lithium battery of a new energy vehicle according to claim 4, characterized in that: A plurality of small holes (10) are provided on the upper bottom 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).

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

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

9. A heat dissipation device for a cylindrical lithium battery of a new energy vehicle according to claim 2, characterized in that: Adjacent columnar lithium-ion batteries (17) are sequentially connected in series via positive and negative electrode conducting paths (1).

10. The heat dissipation device for a cylindrical lithium battery of a new energy vehicle according to claim 8, 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 connected in series in sequence to the positive and negative electrodes of adjacent columnar lithium-ion batteries (17).

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