Liquid cooling and phase change material combined composite cooling device for cylindrical battery

Abstract

The utility model relates to the technical field of battery thermal management of new energy electric vehicles, and discloses a liquid cooling and phase change material combined composite cooling device for a cylindrical battery, which comprises a first liquid cooling component arranged above a battery pack; the second liquid cooling assembly is arranged below the first liquid cooling assembly, and the second liquid cooling assembly is arranged on the peripheral side of the battery pack; the third liquid cooling assembly is arranged below the second liquid cooling assembly, the third liquid cooling assembly is arranged below the battery pack, and the third liquid cooling assembly is communicated with the first liquid cooling assembly through a liquid guide pipe; and the first column body and the second column body are connected, the first column body and the second column body are installed in the battery pack and arranged between the first liquid cooling assembly and the third liquid cooling assembly, and the first column body and the second column body make contact with the second liquid cooling assembly. The heat exchange area of the cooling liquid and the battery can be increased, and efficient cooling is provided for high-power charging and discharging of the electric vehicle.

Description

Technical Field

[0001] The utility model relates to the technical field of battery thermal management of new energy electric vehicles, and more specifically, to a composite cooling device combining liquid cooling and phase change material for cylindrical batteries. Background Art

[0002] In recent years, my country's new energy vehicle industry has developed rapidly. Electric vehicles are an important part of new energy vehicles, and power batteries are the technical key to electric vehicles. The performance of power batteries directly determines the overall performance, safety and service life of electric vehicles. Among the various performance parameters of power batteries, temperature is a key parameter that affects the safety, performance and life of the battery. Too low temperature will lead to a decline in the performance of the entire vehicle, and too high temperature will cause thermal runaway safety accidents.

[0003] During the operation of electric vehicles, the battery system will generate a lot of heat. If it cannot be effectively managed and controlled, it will affect the performance and life of the battery and even cause harm to personal safety. Therefore, the research and application of battery thermal management technology is crucial to improving the safety and stability of the battery system.

[0004] Battery thermal management includes: heat dissipation system, temperature control system, cooling system. The heat dissipation system is mainly used to dissipate the heat generated inside the battery pack to prevent the battery from overheating; the temperature control system will adjust the operating temperature of the battery to keep it within the appropriate range based on the information fed back by the sensor to improve the battery life and performance; when the battery temperature is too high, the cooling system is used to reduce the temperature, usually by liquid cooling or air cooling. The use of a cooling system can effectively control the operating temperature of the battery, improve the battery's charging and discharging efficiency, and thus improve the range and performance of electric vehicles. In the cooling system, factors that affect heat exchange include the structure and materials of the system. For example, the use of thermal conductive materials, liquid cooling channels, air duct design and other means can effectively improve the heat dissipation effect of the battery system, reduce the temperature rise of the battery, extend the battery life, more accurately control the operating temperature of the battery, and improve the thermal management effect of the battery.

[0005] In power batteries, cylindrical batteries have advantages over square batteries and soft-pack batteries, such as mature technology, low cost, excellent heat dissipation performance, and good single-cell consistency. However, with the development of cylindrical power battery size specifications, single cells with a diameter of 18 mm have become obsolete. Major manufacturers are developing power batteries with larger diameters, such as batteries with diameters of 26 mm, 32 mm, and 46 mm. These large-sized batteries face the problem of increased temperature differences. The traditional single cooling method is difficult to provide efficient thermal management means for cylindrical power batteries with increased size. Therefore, this poses new challenges to the design of thermal management of cylindrical batteries.

[0006] In the existing cylindrical battery thermal management system, the heat exchange area of ​​the battery is limited, the heat exchange efficiency of the battery pack formed by multiple batteries is poor when working, and the temperature of the batteries in different parts varies greatly, which affects the life and performance of the battery. Therefore, it is necessary to provide a composite cooling device for cylindrical batteries with liquid cooling combined with phase change materials, which has a large heat exchange area and high heat exchange efficiency. Utility Model Content

[0007] The purpose of the utility model is to provide a composite cooling device for cylindrical batteries combining liquid cooling with phase change materials to solve the problems existing in the prior art, thereby increasing the heat exchange area between the coolant and the battery, maintaining the uniformity of the battery pack temperature, and providing efficient cooling for high-power charging and discharging of electric vehicles.

[0008] To achieve the above-mentioned purpose, the utility model provides the following solution: The utility model provides a composite cooling device for cylindrical batteries combining liquid cooling and phase change material, including: a first liquid cooling component, the first liquid cooling component is arranged above the battery pack; a second liquid cooling component, the second liquid cooling component is arranged below the first liquid cooling component, and the second liquid cooling component is arranged on the periphery of the battery pack; a third liquid cooling component, the third liquid cooling component is arranged below the second liquid cooling component, the third liquid cooling component is arranged below the battery pack, and the third liquid cooling component is connected to the first liquid cooling component through a liquid guide tube; a first column and a second column, the first column is distributed between adjacent second columns, the first column and the second column are installed inside the battery pack, and are arranged between the first liquid cooling component and the third liquid cooling component, and the first column and the second column are in contact with the second liquid cooling component.

[0009] Furthermore, the first liquid cooling assembly includes a first plate, a second plate, a third plate, a fourth plate and a fifth plate, the first plate is fixed above the second plate, the third plate and the fourth plate, the fifth plate is fixed below the second plate, the third plate and the fourth plate, and the second plate, the third plate and the fourth plate are fixedly connected to each other.

[0010] Furthermore, the third plate body is provided with a first water inlet, the first water inlet is connected to the cooling liquid, and the fifth plate body is provided with a plurality of first water outlets.

[0011] Furthermore, the second liquid cooling component includes a sixth plate body, a seventh plate body, an eighth plate body, a shell and a fluid part, the sixth plate body, the seventh plate body, the eighth plate body, the shell and the fluid part are fixedly connected, the sixth plate body, the seventh plate body and the eighth plate body are arranged around the outside of the shell, the fluid part is distributed between the shell and the sixth plate body, the seventh plate body and the eighth plate body, and a cooling liquid flow channel is formed between the fluid parts.

[0012] Furthermore, the seventh plate body is provided with a second water inlet, the eighth plate body is provided with a second water outlet, the second water inlet is connected to the coolant flow channel, and the second water outlet is connected to the coolant flow channel.

[0013] Furthermore, the fluid part includes a first fluid, a second fluid and a third fluid, the lengths of the first fluid, the second fluid and the third fluid decrease successively, the first fluid is fixed on one side of the shell, and a coolant channel is formed between adjacent first fluids, the second fluid and the third fluid are fixed on adjacent sides of the shell, and a coolant channel is formed between the second fluid and the third fluid.

[0014] Furthermore, the third liquid cooling assembly includes a ninth plate, a tenth plate, an eleventh plate, a twelfth plate, a thirteenth plate and a fourteenth plate, the ninth plate is fixed above the tenth plate, the twelfth plate and the thirteenth plate, the eleventh plate is fixed below the tenth plate, the twelfth plate and the thirteenth plate, and the tenth plate, the twelfth plate and the thirteenth plate are fixedly connected to each other.

[0015] Furthermore, the ninth plate body is provided with a third water inlet, the third water inlet is connected to the liquid guiding tube, and the fourteenth plate body is provided with a third water outlet, the third water outlet is used to discharge the coolant.

[0016] Furthermore, a first cavity is provided in the first column, a second cavity is provided in the second column, both sides of the second column are in contact with the first column, and the first column and the second column are provided between the fifth plate and the ninth plate and inside the shell.

[0017] Furthermore, a liquid guiding channel is provided in the liquid guiding tube, the top of the liquid guiding channel is connected to the first water outlet, and the bottom of the liquid guiding channel is connected to the third water inlet.

[0018] The utility model discloses the following technical effects:

[0019] Compared with the prior art, the cooling system of the utility model is composed of phase change material cooling and liquid cooling. Liquid cooling is characterized in that: the first liquid cooling component of the cooling system is responsible for the intake of the coolant and can also cool the upper part of the cylindrical battery, and the second liquid cooling component of the cooling system is responsible for discharging the coolant and can also temporarily store the coolant, so that the coolant is in full contact with the bottom of the battery to take away the heat;

[0020] The two ends of the liquid guide pipe of the cooling system are assembled with the first liquid cooling assembly and the second liquid cooling assembly by welding, and the outer wall of the liquid guide pipe is fully fitted with the side wall of the cylindrical battery, which increases the heat exchange area and prevents the risk of liquid leakage;

[0021] Phase change material cooling embodiment: a first column and a second column are provided to solve the cooling problem of the side battery and the side walls of the four corner batteries;

[0022] A second liquid cooling component is provided to solve the problem that the phase change material absorbs heat and cannot discharge the heat in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 It is an exploded view of the first liquid cooling component in the utility model;

[0026] Figure 3 It is an exploded view of the second liquid cooling component in the utility model;

[0027] Figure 4 It is a schematic diagram of the structure of the fluid component in the utility model;

[0028] Figure 5 It is a structural schematic diagram of the first column in the utility model;

[0029] Figure 6 It is a structural schematic diagram of the second column in the utility model;

[0030] Figure 7 This is a schematic diagram of the structure of the liquid guide tube in the utility model;

[0031] Figure 8 It is a structural schematic diagram of the third liquid cooling component in the utility model;

[0032] Fig. 9 This is an exploded diagram of the battery pack in the utility model;

[0033] Fig.10 It is an exploded view of the first column, the second column and the second liquid cooling assembly in the present invention;

[0034] Among them, 1. the first liquid-cooling component; 11. the first plate body; 12. the second plate body; 13. the third plate body; 131. the first water inlet; 14. the fourth plate body; 15. the fifth plate body; 151. the first water outlet; 2. the second liquid-cooling component; 21. the sixth plate body; 22. the seventh plate body; 221. the second water inlet; 23. the eighth plate body; 231. the second water outlet; 24. the first fluid; 25. the second fluid; 26. the third fluid; 27. the shell; 3. the first column; 31. the first cavity; 4. the third liquid-cooling component; 41. the ninth plate body; 411. the third water inlet; 42. the tenth plate body; 43. the eleventh plate body; 44. the twelfth plate body; 45. the thirteenth plate body; 46. the fourteenth plate body; 461. the third water outlet; 5. the second column; 51. the second cavity; 6. the liquid guide tube; 61. the liquid guide channel. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] like Figure 1-Figure 10 As shown, the utility model provides a composite cooling device combining liquid cooling and phase change material for cylindrical batteries, including: a first liquid cooling component 1, the first liquid cooling component 1 is arranged above the battery pack; a second liquid cooling component 2, the second liquid cooling component 2 is arranged below the first liquid cooling component 1, and the second liquid cooling component 2 is arranged on the peripheral side of the battery pack; a third liquid cooling component 4, the third liquid cooling component 4 is arranged below the second liquid cooling component 2, the third liquid cooling component 4 is arranged below the battery pack, and the third liquid cooling component 4 is connected to the first liquid cooling component 1 through a liquid guide tube 6; a first column 3 and a second column 5, the first column 3 is connected to the second column 5, the first column 3 and the second column 5 are installed in the battery pack, and are arranged between the first liquid cooling component 1 and the third liquid cooling component 4, and the first column 3 and the second column 5 are in contact with the second liquid cooling component 2.

[0038] like Figure 2As shown, the first liquid cooling assembly 1 includes a first plate 11, a second plate 12, a third plate 13, a fourth plate 14 and a fifth plate 15, and the first plate 11, the second plate 12, the third plate 13, the fourth plate 14 and the fifth plate 15 are welded and fixed to each other, wherein the first plate 11 is welded above the second plate 12, the third plate 13 and the fourth plate 14, the fifth plate 15 is welded below the second plate 12, the third plate 13 and the fourth plate 14, and the second plate 12. The third plate body 13 and the fourth plate body 14 are welded and fixed to each other. Two second plate bodies 12 are provided, which are distributed between the third plate body 13 and the fourth plate body 14. The third plate body 13 is provided with a first water inlet 131, and the first water inlet 131 is a square structure. The fifth plate body 15 is also provided with a plurality of first water outlets 151, and the first water outlets 151 are a diamond structure. The cooling liquid enters the first liquid cooling assembly 1 through the first water inlet 131 to cool the top of the battery pack.

[0039] like Figure 3 and Figure 4 As shown, the second liquid cooling component 2 includes a sixth plate body 21, a seventh plate body 22, an eighth plate body 23, a shell 27 and a fluid part. The sixth plate body 21, the seventh plate body 22, the eighth plate body 23, the shell 27 and the fluid part are welded and fixed to each other. The sixth plate body 21, the seventh plate body 22 and the eighth plate body 23 are arranged around the outside of the shell 27. Two sixth plate bodies 21 are provided, distributed on both sides of the shell 27. The seventh plate body 22 and the eighth plate body 23 are relatively arranged and distributed on the other two sides of the shell 27. The seventh plate body 22 is provided with a second water inlet 221, and the second water inlet 221 is a circular structure. The eighth plate body 23 is provided with a second water outlet 231, and the second water outlet 231 is a circular structure. Fluid parts are welded and fixed between the sixth plate body 21, the seventh plate body 22 and the eighth plate body 23.

[0040] The fluid part includes a first fluid 24, a second fluid 25 and a third fluid 26, the lengths of the first fluid 24, the second fluid 25 and the third fluid 26 decrease successively, four groups of first fluids 24 are fixed between the shell 27 and the sixth plate 21, and the four groups of first fluids 24 are arranged in parallel from top to bottom on the side of the shell 27 to form three cooling liquid flow channels; the second fluid 25 and the third fluid 26 are fixed between the shell 27 and the seventh plate 22 and between the shell 27 and the eighth plate 23, three groups of second fluids 25 and two groups of third fluid guides are arranged in parallel from top to bottom on the other two sides of the shell 27 to form three cooling liquid flow channels, and all cooling liquid flow channels constitute linear flow channels; the cooling liquid enters through the second water inlet 221, flows along the cooling liquid flow channel and is discharged from the second water outlet 231, which can take away the heat of the first column 3 and the second column 5 in time, so as to facilitate cooling the side of the edge battery in the battery pack.

[0041] like Figure 8As shown, the third liquid cooling assembly 4 includes a ninth plate body 41, a tenth plate body 42, an eleventh plate body 43, a twelfth plate body 44, a thirteenth plate body 45 and a fourteenth plate body 46. The ninth plate body 41, the tenth plate body 42, the eleventh plate body 43, the twelfth plate body 44, the thirteenth plate body 45 and the fourteenth plate body 46 are welded and fixed to each other, and a square space is formed inside thereof. The ninth plate body 41 is fixed above the tenth plate body 42, the twelfth plate body 44 and the thirteenth plate body 45. Two tenth plate bodies 42 are provided, which are distributed on two opposite sides below the ninth plate body 41. The twelfth plate body 44 and the thirteenth plate body 45 are arranged opposite to each other, the eleventh plate body 43 is fixed below the tenth plate body 42, the twelfth plate body 44 and the thirteenth plate body 45, the ninth plate body 41 is provided with a plurality of third water inlets 411, the number of the third water inlets 411 corresponds to the number of the first water outlets 151, and the third water inlet 411 is in a diamond structure, the fourteenth plate body 46 is provided with a third water outlet 461, and the third water outlet 461 is in a square structure, and cooling also enters the third liquid cooling assembly 4 through the third water inlet 411 to cool the bottom of the battery pack.

[0042] like Figure 5 and Figure 6 as well as Fig. 9 and Fig.10 As shown, the first column 3 and the second column 5 are arranged between the fifth plate 15 and the ninth plate 41, and the first column 3 and the second column 5 are located inside the shell 27, the second column 5 is distributed at the four corners of the shell 27, and the first column 3 is distributed between adjacent first columns 3; a first cavity 31 is arranged inside the first column 3, and the first cavity 31 is filled with phase change material. When the side battery generates heat, the phase change material can absorb the heat in time, and then the heat is taken away by the flow of coolant in the coolant flow channel in the second liquid cooling component 2, thereby improving the cooling efficiency; a second cavity 51 is arranged inside the second column 5, and the second cavity 51 is filled with phase change material. When the four corner batteries generate heat, the phase change material can absorb the heat in time, and then the heat is taken away by the flow of coolant in the coolant flow channel in the second liquid cooling component 2, thereby improving the cooling efficiency.

[0043] like Figure 7 As shown, a liquid guiding channel 61 is provided in the liquid guiding tube 6. The top of the liquid guiding tube 6 is welded to the fifth plate body 15, and the bottom is welded to the ninth plate body 41. The liquid guiding tube 6 is distributed between the cylindrical batteries. The top of the liquid guiding channel 61 is connected to the first water outlet 151, and the bottom is connected to the third water inlet 411. The coolant enters the liquid guiding channel 61 through the first water outlet 151 and is discharged from the third water inlet 411. The outer wall of the liquid guiding tube 6 is in full contact with the side wall of the battery. When the battery generates heat, the coolant takes away the heat from the side wall of the battery, so that the temperature in the battery pack is maintained within a reasonable range, which can further improve the temperature uniformity of the battery pack.

[0044] When the thermal management system starts working, it does not generate too much heat, so there is no need to turn on the liquid cooling system. At this time, the phase change material of the battery can absorb the heat generated by the battery. As the battery working time increases, the heat will accumulate to a certain extent, allowing the phase change material to be fully melted. When the phase change material is completely melted, the battery pack cannot be cooled in time. At this time, the liquid cooling system is turned on, and the coolant enters from the first liquid cooling component 1 and flows to the third liquid cooling component 4 through the liquid conduit 6. The coolant in the first liquid cooling component 1 can cool the heat on the upper part of the battery pack, and the coolant in the liquid conduit 6 can fully exchange heat with the side wall of the inner battery. The third liquid cooling component 4 stores liquid in order to fully contact the bottom of the battery pack, thereby enhancing the heat exchange rate between the coolant and the bottom of the battery pack.

[0045] The first column 3 and the second column 5 are installed inside the battery pack by an embedded installation method. When the second liquid cooling component 2 is working, it is in full contact with the first column 3 and the second column 5. The straight flow channel can increase the heat exchange area with the first column 3 and the second column 5, and promptly take away the heat generated by the battery pack absorbed by the phase change material, thereby increasing the temperature uniformity of the entire battery pack.

[0046] The second liquid cooling component 22 not only provides a cooling effect, but the inner wall of the second liquid cooling component 2 can fix the first column 3, the second column 5 and the battery pack, thereby preventing the problem of poor temperature uniformity among the entire battery pack caused by poor contact between the first column 3, the second column 5 and the battery pack, and can effectively prevent the battery pack from scattering due to collision or bumps of the electric vehicle.

[0047] In the present device, the materials of the first liquid-cooling component 1, the second liquid-cooling component 2, the first column 3, the third liquid-cooling component 4, the second column 5 and the liquid conduit 6 are all aluminum, and the coolant is water or a 50% ethylene glycol aqueous solution; the cylindrical batteries are arranged in parallel; insulating and heat-conducting materials are filled between the batteries and the first liquid-cooling component 1, the second liquid-cooling component 2, the first column 3, the third liquid-cooling component 4, the second column 5 and the liquid conduit 6.

[0048] When the device is working, the battery temperature can be controlled within a reasonable working range, and the heat conduction system is simple, the heat conduction efficiency is high, and the heat conduction uniformity is better. The cooling pipe is made of aluminum with good heat dissipation, and the phase change material is only used on the periphery of the battery pack, so the weight of the product will not cause additional cost problems. In addition, the efficient coolant maintains the temperature uniformity of the battery, which can provide a cooling effect for the charging and discharging of high-power batteries of electric vehicles and realize efficient cooling of cylindrical batteries.

[0049] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, 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 invention.

[0050] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A composite cooling device for cylindrical batteries using liquid cooling combined with phase change materials, characterized in that: include: A first liquid cooling component (1), wherein the first liquid cooling component (1) is arranged above the battery pack; A second liquid cooling component (2), the second liquid cooling component (2) being arranged below the first liquid cooling component (1), and the second liquid cooling component (2) being arranged on a peripheral side of the battery pack; a third liquid cooling component (4), the third liquid cooling component (4) being arranged below the second liquid cooling component (2), the third liquid cooling component (4) being arranged below the battery pack, and the third liquid cooling component (4) being connected to the first liquid cooling component (1) via a liquid conduit (6); A first column (3) and a second column (5), wherein the first column (3) is distributed between adjacent second columns (5), the first column (3) and the second column (5) are installed inside the battery pack and arranged between the first liquid cooling component (1) and the third liquid cooling component (4), and the first column (3) and the second column (5) are in contact with the second liquid cooling component (2).

2. The composite cooling device for cylindrical batteries using liquid cooling combined with phase change materials according to claim 1, characterized in that: The first liquid cooling component (1) comprises a first plate (11), a second plate (12), a third plate (13), a fourth plate (14) and a fifth plate (15); the first plate (11) is fixed above the second plate (12), the third plate (13) and the fourth plate (14); the fifth plate (15) is fixed below the second plate (12), the third plate (13) and the fourth plate (14); the second plate (12), the third plate (13) and the fourth plate (14) are fixedly connected to each other.

3. The composite cooling device for cylindrical batteries using liquid cooling combined with phase change materials according to claim 2, characterized in that: The third plate body (13) is provided with a first water inlet (131), and the first water inlet (131) is connected to a cooling liquid. The fifth plate body (15) is provided with a plurality of first water outlets (151), and the first water outlets (151) are connected to the liquid guide tube (6).

4. The composite cooling device for cylindrical batteries using liquid cooling combined with phase change materials according to claim 3, characterized in that: The second liquid cooling component (2) comprises a sixth plate body (21), a seventh plate body (22), an eighth plate body (23), a shell (27) and a fluid component, wherein the sixth plate body (21), the seventh plate body (22), the eighth plate body (23), the shell (27) and the fluid component are fixedly connected, the sixth plate body (21), the seventh plate body (22) and the eighth plate body (23) are arranged on the outside of the shell (27), the fluid component is distributed between the shell (27) and the sixth plate body (21), the seventh plate body (22) and the eighth plate body (23), and a cooling liquid flow channel is formed between the fluid components.

5. The composite cooling device for cylindrical batteries using liquid cooling combined with phase change materials according to claim 4, characterized in that: The seventh plate body (22) is provided with a second water inlet (221), and the eighth plate body (23) is provided with a second water outlet (231), the second water inlet (221) is connected to the coolant flow channel, and the second water outlet (231) is connected to the coolant flow channel.

6. The composite cooling device for cylindrical batteries using liquid cooling combined with phase change materials according to claim 4, characterized in that: The fluid component comprises a first fluid (24), a second fluid (25) and a third fluid (26), wherein the lengths of the first fluid (24), the second fluid (25) and the third fluid (26) decrease in sequence, the first fluid (24) is fixed on one side of the shell (27), and a cooling liquid channel is formed between adjacent first fluids (24), the second fluid (25) and the third fluid (26) are fixed on adjacent sides of the shell (27), and a cooling liquid flow channel is formed between the second fluid (25) and the third fluid (26).

7. The composite cooling device for cylindrical batteries using liquid cooling combined with phase change materials according to claim 4, characterized in that: The third liquid cooling assembly (4) includes a ninth plate (41), a tenth plate (42), an eleventh plate (43), a twelfth plate (44), a thirteenth plate (45) and a fourteenth plate (46); the ninth plate (41) is fixed above the tenth plate (42), the twelfth plate (44) and the thirteenth plate (45); the eleventh plate (43) is fixed below the tenth plate (42), the twelfth plate (44) and the thirteenth plate (45); and the tenth plate (42), the twelfth plate (44) and the thirteenth plate (45) are fixedly connected to each other.

8. The composite cooling device for cylindrical batteries using liquid cooling combined with phase change materials according to claim 7, characterized in that: The ninth plate body (41) is provided with a third water inlet (411), and the third water inlet (411) is connected to the liquid guide tube (6); the fourteenth plate body (46) is provided with a third water outlet (461), and the third water outlet (461) is used to discharge the cooling liquid.

9. The composite cooling device for cylindrical batteries using liquid cooling combined with phase change materials according to claim 8, characterized in that: A first cavity (31) is provided in the first column (3), a second cavity (51) is provided in the second column (5), both sides of the second column (5) are in contact with the first column (3), and the first column (3) and the second column (5) are arranged between the fifth plate (15) and the ninth plate (41), and are arranged inside the shell (27).

10. The composite cooling device for cylindrical batteries using liquid cooling combined with phase change materials according to claim 8, characterized in that: A liquid guiding channel (61) is provided in the liquid guiding pipe (6); the top of the liquid guiding channel (61) is connected to the first water outlet (151), and the bottom is connected to the third water inlet (411).

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