Cylindrical battery heat dissipation device of pure electric vehicle

Abstract

The invention discloses a cylindrical battery heat dissipation device of a pure electric vehicle. The cylindrical battery heat dissipation device comprises a phase change carrier and a plurality of monomer heat dissipation structures, each single heat dissipation structure comprises a battery structure, a middle structure, a cold liquid plate and a heat dissipation plate; the middle structure is fixed between the battery structure and the cooling liquid plate, and one end of the heat dissipation plate is fixed on the battery structure, penetrates through the middle structure and the cooling liquid plate and extends into the phase change carrier; phase change heat conduction materials are filled between the battery structure and the middle structure and between the middle structure and the cold liquid plate, heat of the battery structure is transmitted to the cold liquid plate through the phase change heat conduction materials, the middle structure and the heat dissipation plate, and the single heat dissipation structures dissipate heat outwards through the cold liquid plate. According to the invention, the single heat dissipation structure is filled with the phase change heat conduction material to absorb the heat energy generated by the battery structure, and the heat is transferred to the cold liquid plate for heat dissipation through the intermediate structure and the heat dissipation plate, so that the problem of poor heating efficiency caused by the fact that liquid cooling heat dissipation cannot be matched with a cylindrical battery in an attached manner in the prior art is effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of battery heat dissipation and thermal conductivity, and in particular to a heat dissipation device for a cylindrical battery of a pure electric vehicle. Background Art

[0002] With the increasing depletion of fossil fuels and the intensification of environmental pollution, governments around the world have proposed energy transformation strategies and vigorously developed renewable energy and clean energy. As an important way to reduce carbon emissions and ease energy pressure, new energy vehicles have received widespread attention and support. Therefore, new energy vehicle batteries, as the core technology of new energy vehicles, have also received high attention and development.

[0003] Cylindrical batteries usually provide a longer cycle life, and this advantage is particularly evident in rechargeable batteries. Secondly, the production process of cylindrical cells is mature, the battery product yield is high, and the service life is also improved. Therefore, it has become the most common form of battery used in new energy vehicles. Cylindrical batteries are usually put into use in the form of battery packs, that is, multiple single cells are combined into a battery pack. However, this combination of multiple batteries will cause heat accumulation. First, it will cause the temperature of the battery to rise sharply. Second, due to the agglomeration effect, the temperature of the battery in the center will have a large difference from the surrounding batteries, affecting the uniformity of the battery pack. These two points are usually the main factors that reduce battery life and even cause thermal runaway.

[0004] The common battery pack heat dissipation solutions currently include air cooling, liquid cooling and phase change cooling. Air cooling can only play a certain role under low temperature conditions. Liquid cooling is usually affected by the flow channel design and cannot fit the heat generation area of ​​the cylindrical battery, thereby greatly reducing the liquid cooling efficiency. In recent years, phase change materials have been widely studied and applied to battery heat dissipation due to their high efficiency heat dissipation performance and environmental protection and energy saving. Summary of the invention

[0005] The present invention provides a cylindrical battery heat dissipation device for a pure electric vehicle which utilizes phase change material to dissipate heat from the cylindrical battery.

[0006] The present invention is achieved through the following technical solutions:

[0007] A cylindrical battery heat dissipation device for a pure electric vehicle, suitable for heat dissipation of cylindrical batteries, comprising: a phase change carrier, and a plurality of single heat dissipation structures installed in the phase change carrier; the single heat dissipation structure comprises: a battery structure, an intermediate structure, a cold liquid plate, and a heat dissipation plate;

[0008] The intermediate structure is fixed to the periphery of the battery structure, the cold liquid plate is fixed to the periphery of the intermediate structure, one end of the heat dissipation plate is fixed to the battery structure, and the heat dissipation plate penetrates the intermediate structure and the cold liquid plate and extends into the phase change carrier;

[0009] Phase change thermal conductive material is filled between the battery structure and the intermediate structure, and between the intermediate structure and the cold liquid plate. The heat of the battery structure is transferred to the cold liquid plate via the phase change thermal conductive material, the intermediate structure and the heat dissipation plate, and the single heat dissipation structure dissipates heat to the outside through the cold liquid plate.

[0010] Further, the battery structure includes: a cylindrical battery and a plurality of first heat dissipation fins fixed on the outer surface of the cylindrical battery;

[0011] An inner annular groove is formed between adjacent first heat dissipation fins, and the phase-change heat conductive material is filled in the inner annular groove.

[0012] Furthermore, the first heat dissipation fins are parallel to each other, and a plurality of the first heat dissipation fins are equidistantly distributed along the axis of the cylindrical battery.

[0013] Furthermore, the intermediate structure includes: a heat conductive sheet and a plurality of second heat dissipation fins fixed on the heat conductive sheet; the heat conductive sheet is fixed on the battery structure, and the second heat dissipation fins are fixed on a side of the heat conductive sheet away from the battery structure;

[0014] An outer annular groove is formed between adjacent second heat dissipation fins, and the phase-change heat conductive material is filled in the outer annular groove.

[0015] Furthermore, the second heat dissipation fins are parallel to each other, and a plurality of the second heat dissipation fins are equidistantly distributed along the axis of the cylindrical battery.

[0016] Furthermore, a plurality of microchannels are arranged in the cold liquid plate, and liquid flows through the cold liquid plate through the microchannels.

[0017] Furthermore, the heat sink is located on the axial plane of the battery structure, and a plurality of the heat sinks are fixed on the battery structure at equal distances.

[0018] Furthermore, it also includes: a liquid storage plate, which is located on both sides of the phase change carrier and both ends of the monomer heat dissipation structure; the cold liquid plate is connected to the liquid storage plate, and the coolant passes through the liquid storage plate and the cold liquid plate to dissipate heat from the monomer heat dissipation structure.

[0019] Furthermore, the liquid storage plate includes: a circulation pipeline and a water storage area; the circulation pipeline includes: a main inlet and outlet, and a branch pipeline;

[0020] The cold liquid plates of the plurality of the single heat dissipation structures are connected to the same water storage area;

[0021] The circulation pipeline is connected to a plurality of adjacent water storage areas through the branch pipelines;

[0022] The coolant flows into the cold liquid plate through the main inlet and outlet via the branch pipeline and the water storage area; the coolant in the cold liquid plate flows out of the liquid storage plate via the water storage area and the branch pipeline via the main inlet and outlet.

[0023] Furthermore, the phase-change thermal conductive material and the phase-change carrier both include:

[0024] Support material, wherein the support material is high-density polyethylene;

[0025] Phase change material, wherein the phase change material is paraffin;

[0026] The thermally conductive material is expanded graphite.

[0027] The beneficial effects of the present invention are:

[0028] Each cylindrical battery of the present invention is equipped with a single heat dissipation structure, and the single heat dissipation structure is filled with phase change heat conductive material, which is used to absorb the heat energy generated by the battery structure, and transfer the heat to the cold liquid plate through the intermediate structure and the heat dissipation plate for heat dissipation. The phase change heat conductive material can effectively absorb the heat generated by the battery structure through its own solid-liquid phase change, and transfer the heat to the outside of the battery through the heat dissipation plate and the intermediate structure in a liquid cooling manner, which effectively solves the problem in the prior art that liquid cooling heat dissipation cannot fit the cylindrical battery well, resulting in poor heating efficiency.

[0029] The single heat dissipation structure is fixed in the phase change carrier in an array manner, achieving the advantages of compact structure, light weight, and easy maintenance. At the same time, the single heat dissipation structure is installed on the phase change carrier in an inlaid manner, and the cold liquid plate of the single heat dissipation structure is in direct contact with the phase change carrier. The heat dissipation plate of the single heat dissipation structure also extends directly from the battery structure to the phase change carrier. Part of the heat accumulated in the battery is transferred to the peripheral phase change carrier of the single heat dissipation structure through the heat dissipation plate for storage, and then absorbed by the cold liquid plate. In a compact structure environment, it can still effectively reduce the problem of heat accumulation in the single heat dissipation structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0031] Figure 1 It is a schematic diagram of the overall assembly structure of the present invention;

[0032] Figure 2 It is a three-dimensional structural schematic diagram of a single heat dissipation structure;

[0033] Figure 3 yes Figure 2 A schematic diagram of a partial cross-sectional structure;

[0034] Figure 4 It is a schematic diagram of an assembly structure in which multiple single heat dissipation structures are installed in a phase change carrier;

[0035] Figure 5 It is a schematic diagram of the three-dimensional structure of the liquid storage plate in the present invention;

[0036] Figure 6 It is a schematic diagram of the internal structure of the liquid storage plate in the present invention.

[0037] in:

[0038] 1. Single-cell heat dissipation structure; 11. Battery structure; 111. Cylindrical battery; 112. First heat dissipation fin; 113. Inner annular groove; 12. Intermediate structure; 121. Heat conducting plate; 122. Second heat dissipation fin; 123. Outer annular groove; 13. Cold liquid plate; 130. Microchannel; 14. Heat dissipation plate; 2. Phase change carrier; 3. Liquid storage plate; 31. Circulation pipeline; 311. Main inlet and outlet; 312. Branch pipeline; 32. Water storage area; 320. Arc-shaped connecting sleeve. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0040] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] Please refer to Figures 1 to 4 The present invention discloses a cylindrical battery heat dissipation device for a pure electric vehicle, which is suitable for heat dissipation of a cylindrical battery 111, and includes: a phase change carrier 2, and a plurality of single heat dissipation structures 1 installed in the phase change carrier 2; the single heat dissipation structure 1 includes: a battery structure 11, an intermediate structure 12, a cold liquid plate 13, and a heat dissipation plate 14. Among them, the battery structure 11 includes a cylindrical battery 111, and the cylindrical battery 111 generates heat when a chemical reaction occurs inside to generate electrical energy. In order to avoid heat accumulation in the cylindrical battery 111, the temperature of the cylindrical battery 111 is too high, which affects the service life of the cylindrical battery 111.

[0043] The intermediate structure 12 is fixed to the periphery of the battery structure 11 , the cold liquid plate 13 is fixed to the periphery of the intermediate structure 12 , one end of the heat dissipation plate 14 is fixed to the battery structure 11 , and the heat dissipation plate 14 penetrates the intermediate structure 12 and the cold liquid plate 13 and extends into the phase change carrier 2 .

[0044] The present invention adds some devices to the cylindrical battery 111 to form the battery structure 11 described in the present invention; the intermediate structure 12 and the cold liquid plate 13 are sequentially arranged outwardly with the axis of the cylindrical battery 111 as the center for heat conduction and heat dissipation; the heat sink 14 extends outwardly with the battery structure 11 as the center, penetrating the intermediate structure 12 and the cold liquid plate 13, with the purpose of increasing the external heat transfer efficiency of the battery structure 11. Among them, the purpose of the heat sink 14 extending into the phase change carrier 2 after passing through the cold liquid plate 13 is that when the cold liquid plate 13 cannot meet the heat dissipation demand, the heat sink 14 transfers the heat in the single heat dissipation structure 1 to the external box change carrier, and outputs the accumulated heat of the battery structure 11 as the ambient temperature of the single heat dissipation structure 1, and the outer periphery of the single heat dissipation structure 1 is the cold liquid plate 13, and the cold liquid plate 13 dissipates heat to the internal environment and the external environment of the single heat dissipation structure 1 at the same time.

[0045] Phase change thermal conductive material is filled between the battery structure 11 and the intermediate structure 12 and between the intermediate structure 12 and the cold liquid plate 13. The heat of the battery structure 11 is transferred to the cold liquid plate 13 via the phase change thermal conductive material, the intermediate structure 12 and the heat dissipation plate 14. The single body heat dissipation structure 1 dissipates heat to the outside through the cold liquid plate 13.

[0046] In the present invention, phase change thermal conductive material is filled between the battery structure 11 and the intermediate structure 12, and between the intermediate structure 12 and the cold liquid plate 13. After absorbing enough heat, the phase change thermal conductive material changes from a solid phase to a liquid phase. After the heat is absorbed by the phase change thermal conductive material, it is stored on the periphery of the battery structure 11. However, the thermal conductivity of the phase change thermal conductive material is difficult to meet the heat dissipation requirements of the single heat dissipation structure 1. Therefore, the heat of the phase change thermal conductive material and the intermediate structure 12 is transferred to the cold liquid plate 13 through the heat dissipation plate 14 for heat dissipation.

[0047] The battery structure 11 includes: a cylindrical battery 111 and a plurality of first heat dissipation fins 112 fixed on the outer surface of the cylindrical battery 111. The first heat dissipation fins 112 are located between the cylindrical battery 111 and the intermediate structure 12. The cylindrical battery 111, the intermediate structure 12 and the adjacent first heat dissipation fins 112 constitute an inner annular groove 113, and the phase-change thermal conductive material is filled in the inner annular groove 113. The first heat dissipation fins 112 are made of thermal conductive material. For example, in an achievable embodiment of the present invention, the first heat dissipation fins 112 are aluminum arc sheets or rings. The first heat dissipation fins 112 are used to increase the thermal conductive area of ​​the cylindrical battery 111, which is beneficial for the rapid transfer of heat from the cylindrical battery 111 to the phase-change thermal conductive material.

[0048] In an achievable embodiment of the present invention, the first heat dissipation fins 112 are parallel to each other, and a plurality of the first heat dissipation fins 112 are equidistantly distributed along the axis of the cylindrical battery 111. As described above, the first heat dissipation fins 112 are circular rings or arc-shaped pieces fixed to the outer surface of the cylindrical battery 111, and the center of the first heat dissipation fins 112 is located on the axis of the cylindrical battery 111, and the distances between adjacent first heat dissipation fins 112 are the same. Preferably, the axis of the cylindrical battery 111 is perpendicular to the first heat dissipation fins 112.

[0049] The intermediate structure 12 includes: a heat conductive sheet 121 and a plurality of second heat dissipation fins 122 fixed on the heat conductive sheet 121; the heat conductive sheet 121 is fixed on the battery structure 11, and the second heat dissipation fins 122 are fixed on a side of the heat conductive sheet 121 away from the battery structure 11;

[0050] An outer annular groove 123 is formed between adjacent second heat dissipation fins 122 , and the phase-change heat conductive material is filled in the outer annular groove 123 .

[0051] The inner surface of the heat conductive sheet 121 is fixed on the first heat dissipation fin 112, so that the phase change heat conductive material is enclosed in the inner annular groove 113. The heat conductive sheet 121 is an arc-shaped sheet or cylindrical structure with heat conductive performance fixed to the periphery of the battery structure 11, and its function is to transfer the heat generated in the battery structure 11 and the inner annular groove 113 to the intermediate structure 12 and the cold liquid plate 13. The function of the second heat dissipation fin 122 is similar to that of the first heat dissipation fin 112. The second heat dissipation fin 122 is a ring or an arc-shaped sheet fixed on the outer wall of the heat conductive sheet 121. The outer wall of the heat conductive sheet 121, the cold liquid plate 13 and the adjacent second heat dissipation fin 122 constitute an outer annular groove 123, and the outer annular groove 123 is filled with phase change heat conductive material for storing the heat transferred from the battery structure 11 and the intermediate structure 12.

[0052] In an achievable embodiment of the present invention, the second heat dissipation fins 122 are parallel to each other, and a plurality of the second heat dissipation fins 122 are equidistantly distributed along the axis of the cylindrical battery 111. The second heat dissipation fins 122 are fixed to the thermal conductive sheet 121 in the same manner as the first heat dissipation fins 112 are fixed to the cylindrical battery 111.

[0053] The cold liquid plate 13 is provided with a plurality of microchannels 130, through which liquid flows through the cold liquid plate 13. The inner wall of the cold liquid plate 13 is in close contact with the second heat dissipation fins 122 and the phase change heat conductive material in the inner annular groove 113, and the outer wall of the cold liquid plate 13 is in close contact with the phase change carrier 2. The heat inside the single heat dissipation structure 1 and the environment is dissipated to the outside through the liquid flowing through the cold liquid plate 13.

[0054] In an achievable embodiment of the present invention, the cross section of the cold liquid plate 13 is arc-shaped, the axis of the cold liquid plate 13 is the same as the axis of the cylindrical battery 111, and a plurality of partition walls are provided inside the cold liquid plate 13, so that a plurality of microchannels 130 are formed inside the cold liquid plate 13. Preferably, the cross section of the microchannel 130 is triangular or trapezoidal, adjacent microchannels 130 are centrally symmetrical, and the diameter of each microchannel 130 is the same. The purpose of the arc-shaped cold liquid plate 13 is to uniformly dissipate heat from the monomer heat dissipation structure 1.

[0055] The heat dissipation plates 14 are located on the axial plane of the battery structure 11, and a plurality of the heat dissipation plates 14 are fixed to the battery structure 11 at equal intervals. The purpose of fixing the heat dissipation plates 14 in the single heat dissipation structure 1 at equal intervals is to facilitate uniform heat dissipation of the single heat dissipation structure 1.

[0056] Please refer to Figure 5 and Figure 6As can be seen from the above, the monomer heat dissipation structure 1 dissipates heat to the outside through the cold liquid plate 13. Therefore, the pure electric vehicle cylindrical battery heat dissipation device also includes: a liquid storage plate 3. The liquid storage plate 3 is located on both sides of the phase change carrier 2 and both ends of the monomer heat dissipation structure 1; the cold liquid plate 13 is connected to the liquid storage plate 3, and the coolant passes through the liquid storage plate 3 and the cold liquid plate 13 to dissipate heat to the monomer heat dissipation structure 1. Among them, one liquid storage plate 3 is used to supply coolant to the cold liquid plate 13, and the other liquid storage plate 3 receives the coolant and flows out to the external heat dissipation device.

[0057] In an achievable embodiment of the present invention, the liquid storage plate 3 includes: a circulation pipeline 31 and a water storage area 32 ; the circulation pipeline 31 includes: a main inlet and outlet 311 and a branch pipeline 312 .

[0058] The coolant enters or flows out of the liquid storage plate 3 through the main inlet and outlet 311, and the coolant entering the main inlet and outlet 311 flows into the liquid storage plate 3 through the branch pipeline 312. The liquid storage plate 3 is divided into a plurality of water storage areas 32, each of which is connected to a branch pipeline 312, and a plurality of adjacent water storage areas 32 are connected to the same flow pipe 31 through the branch pipeline 312. The water storage area 32 is connected to the cold liquid plates 13 of a plurality of single heat dissipation structures 1 at the same time.

[0059] From the above, it can be seen that after the coolant enters the circulation pipe 31 through the main inlet and outlet 311, it is evenly dispersed through the branch pipes 312 and flows into each of the water storage areas 32 connected thereto; the coolant flows into another liquid storage plate 3 after passing through the cold liquid plate 13 and is discharged.

[0060] The purpose of setting a plurality of branch pipes 312 in the circulation pipe 31 of the present invention is to evenly distribute the coolant to each water storage area 32, while reducing the coolant flow rate of a single water storage area 32, reducing the liquid pressure drop of the water storage area 32, and effectively increasing the cooling effect of the coolant on the single heat dissipation structure 1.

[0061] In a feasible embodiment of the present invention, an arc-shaped connecting sleeve 320 is provided on the side of the liquid storage plate 3 facing the single body heat dissipation structure 1, and the arc-shaped connecting sleeve 320 is connected with the cold liquid plate 13, and the arc-shaped connecting sleeve 320 increases the airtightness of the connection between the liquid storage plate 3 and the cold liquid plate 13.

[0062] When assembling the cylindrical battery heat dissipation device for a pure electric vehicle disclosed in the present invention, the heat dissipation plate 14 is first fixed on the cylindrical battery 111; then the first heat dissipation fin 112 is fixed on the outer wall of the cylindrical battery 111, so that an inner annular groove 113 is formed on the outer wall of the cylindrical battery 111; after the phase change heat conductive material is filled into the inner annular groove 113, the heat conductive sheet 121 is welded and fixed between the outer wall of the first heat dissipation fin 112 and the adjacent heat dissipation plate 14, so as to close the inner annular groove 113; the second heat dissipation fin 122 is fixed on the heat conductive sheet 121, so that an outer annular groove 123 is formed on the outer wall of the heat conductive sheet 121; after the phase change heat conductive material is filled into the outer annular groove 123, the cold liquid plate 13 is fixed between the outer wall of the second heat dissipation fin 122 and the adjacent heat dissipation plate 14, so as to close the outer annular groove 123. According to the size and installation array of the single heat dissipation structure 1, a phase change carrier 2 is manufactured, and several single heat dissipation structures 1 are embedded and installed in the phase change carrier 2. Finally, the liquid storage plate 3 is fixed at both ends of the phase change carrier 2 to connect the liquid storage plate 3 with the cold liquid plate 13.

[0063] In an achievable embodiment of the present invention, the phase-change thermal conductive material and the phase-change carrier 2 are made of the same material, including:

[0064] Support material, wherein the support material is high-density polyethylene;

[0065] Phase change material, wherein the phase change material is paraffin;

[0066] The thermally conductive material is expanded graphite.

[0067] The phase-change thermal conductive material and the phase-change carrier 2 are mixed by supporting materials, phase-change materials and thermal conductive materials. In a preferred embodiment of the present invention, the phase-change thermal conductive material and the phase-change carrier 2 specifically include: expanded graphite with a mass ratio of 17%, high-density polyethylene with a mass ratio of 17%, and paraffin with a mass ratio of 66%. Among them, the paraffin is a phase-change material, and the paraffin is converted from solid to liquid to store heat; when the paraffin undergoes a phase change, the volume also changes. In order to prevent the volume change from affecting the normal operation of the monomer heat dissipation structure 1 and the phase-change carrier 2, the high-density polyethylene plays a supporting role to ensure the stability of the overall structure and internal structure of the cylindrical battery heat dissipation device of the pure electric vehicle; the expanded graphite is used to increase the thermal conductivity of the phase-change thermal conductive material and the phase-change carrier 2.

[0068] Each cylindrical battery 111 of the present invention is equipped with a single heat dissipation structure 1, and the single heat dissipation structure 1 is filled with a phase change heat conductive material, which is used to absorb the heat energy generated by the battery structure 11, and transfer the heat to the cold liquid plate 13 through the intermediate structure 12 and the heat dissipation plate 14 for heat dissipation. The phase change heat conductive material can effectively absorb the heat generated by the battery structure 11 through its own solid-liquid phase change, and transfer the heat to the outside of the battery through the heat dissipation plate 14 and the intermediate structure 12 in a liquid cooling manner, which effectively solves the problem in the prior art that the liquid cooling heat dissipation cannot fit the cylindrical battery 111 tightly, resulting in poor heating efficiency.

[0069] The monomer heat dissipation structure 1 is fixed in the phase change carrier 2 in an array manner, achieving the advantages of compact structure, light weight, and convenient maintenance. At the same time, the monomer heat dissipation structure 1 is installed on the phase change carrier 2 in an inlaid manner, and the cold liquid plate 13 of the monomer heat dissipation structure 1 is in direct contact with the phase change carrier 2. The heat dissipation plate 14 of the monomer heat dissipation structure 1 also extends directly from the battery structure 11 to the phase change carrier 2. Part of the heat accumulated in the battery is transferred to the peripheral phase change carrier 2 of the monomer heat dissipation structure 1 through the heat dissipation plate 14 for storage, and then absorbed by the cold liquid plate 13. In a compact structure environment, the problem of heat accumulation in the monomer heat dissipation structure 1 can still be effectively reduced.

[0070] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A cylindrical battery heat dissipation device for pure electric vehicles, suitable for heat dissipation of cylindrical batteries, characterized in that: include: A phase change carrier and a plurality of monomer heat dissipation structures installed in the phase change carrier; The single body heat dissipation structure comprises: a battery structure, an intermediate structure, a cold liquid plate and a heat dissipation plate; The intermediate structure is fixed to the periphery of the battery structure, the cold liquid plate is fixed to the periphery of the intermediate structure, one end of the heat dissipation plate is fixed to the battery structure, and the heat dissipation plate penetrates the intermediate structure and the cold liquid plate and extends into the phase change carrier; Phase change thermal conductive material is filled between the battery structure and the intermediate structure, and between the intermediate structure and the cold liquid plate. The heat of the battery structure is transferred to the cold liquid plate via the phase change thermal conductive material, the intermediate structure and the heat dissipation plate, and the single heat dissipation structure dissipates heat to the outside through the cold liquid plate.

2. The heat dissipation device for cylindrical batteries of pure electric vehicles according to claim 1, characterized in that: The battery structure comprises: a cylindrical battery and a plurality of first heat dissipation fins fixed on the outer surface of the cylindrical battery; An inner annular groove is formed between adjacent first heat dissipation fins, and the phase-change heat conductive material is filled in the inner annular groove.

3. The heat dissipation device for cylindrical batteries of pure electric vehicles according to claim 2, characterized in that: The first heat dissipation fins are parallel to each other, and a plurality of the first heat dissipation fins are equidistantly distributed along the axis of the cylindrical battery.

4. The heat dissipation device for cylindrical batteries of pure electric vehicles according to claim 1, characterized in that: The intermediate structure comprises: a heat conductive sheet and a plurality of second heat dissipation fins fixed on the heat conductive sheet; the heat conductive sheet is fixed on the battery structure, and the second heat dissipation fins are fixed on a side of the heat conductive sheet away from the battery structure; An outer annular groove is formed between adjacent second heat dissipation fins, and the phase-change heat conductive material is filled in the outer annular groove.

5. The heat dissipation device for cylindrical batteries of pure electric vehicles according to claim 4, characterized in that: The second heat dissipation fins are parallel to each other, and a plurality of the second heat dissipation fins are equidistantly distributed along the axis of the cylindrical battery.

6. The heat dissipation device for cylindrical batteries of pure electric vehicles according to claim 1, characterized in that: A plurality of microchannels are arranged in the cold liquid plate, and liquid flows through the cold liquid plate through the microchannels.

7. The heat dissipation device for cylindrical batteries of pure electric vehicles according to claim 1, characterized in that: The heat dissipation plate is located on the axial plane of the battery structure, and a plurality of the heat dissipation plates are fixed on the battery structure at equal distances.

8. The heat dissipation device for cylindrical batteries of pure electric vehicles according to claim 1, characterized in that: Also includes: The liquid storage plate is located at both sides of the phase change carrier and both ends of the monomer heat dissipation structure; the cold liquid plate is connected to the liquid storage plate, and the coolant passes through the liquid storage plate and the cold liquid plate to dissipate heat from the monomer heat dissipation structure.

9. The heat dissipation device for cylindrical batteries of pure electric vehicles according to claim 8, characterized in that: The liquid storage plate includes: a circulation pipeline and a water storage area; the circulation pipeline includes: a main inlet and outlet, and a branch pipeline; The cold liquid plates of the plurality of the single heat dissipation structures are connected to the same water storage area; The circulation pipeline is connected to a plurality of adjacent water storage areas through the branch pipelines; The coolant flows into the cold liquid plate through the main inlet and outlet via the branch pipeline and the water storage area; the coolant in the cold liquid plate flows out of the liquid storage plate via the water storage area and the branch pipeline via the main inlet and outlet.

10. The cylindrical battery heat dissipation device for pure electric vehicles according to claim 1, characterized in that: The phase-change thermal conductive material and the phase-change carrier both include: Support material, wherein the support material is high-density polyethylene; Phase change material, wherein the phase change material is paraffin; The thermally conductive material is expanded graphite.

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