A heat dissipation and thermal insulation device for a power battery pack

Abstract

The present invention provides a heat dissipation and insulation device for a power battery pack. The heat dissipation and insulation device for the power battery pack includes a liquid cooling plate and a plurality of heat dissipation flat plates. A flow structure is provided on the liquid cooling plate, and a plurality of accommodation grooves are provided in the middle of the liquid cooling plate. The plurality of accommodation grooves are staggered and distributed on the upper and lower surfaces of the liquid cooling plate. One end of the heat dissipation flat plate is vertically arranged in the accommodation groove. A heat dissipation structure and a refrigerant flowing in the heat dissipation structure are provided in the heat dissipation flat plate. An accommodation space is formed between two adjacent heat dissipation flat plates, and the accommodation space is used for storing the battery pack. The liquid cooling plate is communicated with an air conditioning system. When the temperature of the battery pack is relatively low, the air conditioning system is used to heat the coolant in the liquid cooling plate, so as to transfer the heat to the plurality of heat dissipation flat plates through the coolant, and the heat dissipation flat plates transfer the heat to the battery pack. The heat dissipation and insulation device provided by this application can realize the functions of low-temperature heating and high-temperature heat dissipation of the battery pack, and improve the service performance of the battery pack.

Description

Technical Field

[0001] The present invention relates to the technical field of power battery heat dissipation, and particularly relates to a power battery pack heat dissipation and heat preservation device. Background Art

[0002] With the progress of technology and the rapid development of productivity, automobiles have been popularized in people's daily lives, improving people's travel efficiency and greatly facilitating people's lives.

[0003] Nowadays, with the development of the times, new energy electric vehicles have gradually been recognized by people, and the ownership has been continuously increasing. Among them, the power battery pack is one of the core components of new energy electric vehicles, which is used to provide power for new energy electric vehicles.

[0004] Among them, most of the existing technologies use liquid cooling plates to dissipate heat from the power battery packs in new energy electric vehicles. However, the existing technologies will set many bulges for flow around on the liquid cooling plates, which greatly increases the flow resistance of the cooling medium inside the liquid cooling plates, thus consuming more energy, affecting the performance of the power battery packs, and reducing the user experience.

[0005] Therefore, in view of the deficiencies of the existing technologies, it is necessary to provide a device that can improve the heat dissipation effect of the power battery pack. Summary of the Invention

[0006] Based on this, the purpose of the present invention is to provide a power battery pack heat dissipation and heat preservation device to solve the problems that the existing technologies have poor heat dissipation effect on the power battery packs in new energy electric vehicles, resulting in uneven heat dissipation of the power battery packs, affecting the performance of the power battery packs.

[0007] The first aspect of the embodiment of the present invention provides a power battery pack heat dissipation and heat preservation device, including a liquid cooling plate and a plurality of heat dissipation flat plates. A flow structure is provided on the liquid cooling plate, and the flow structure is used for circulating the coolant. A plurality of accommodation grooves are provided in the middle of the liquid cooling plate, and the plurality of accommodation grooves are staggered and distributed on the upper and lower surfaces of the liquid cooling plate. One end of the heat dissipation flat plate is vertically arranged in the accommodation groove. A heat dissipation structure and a refrigerant flowing in the heat dissipation structure are provided in the heat dissipation flat plate. The heat dissipation structure and the refrigerant are used to transfer the heat received by the heat dissipation flat plate to the liquid cooling plate. An accommodation space is formed between two adjacent heat dissipation flat plates, and the accommodation space is used for storing the battery pack. The liquid cooling plate is communicated with the air conditioning system. When the temperature of the battery pack is relatively low, the air conditioning system is used to heat the coolant in the liquid cooling plate, so as to transfer the heat to the plurality of heat dissipation flat plates through the coolant, and the heat dissipation flat plates transfer the heat to the battery pack.

[0008] The beneficial effects of the present invention are as follows: By staggeredly arranging a number of accommodating grooves on the upper and lower surfaces of the liquid cooling plate, during installation, one end of each heat dissipation flat plate is vertically arranged corresponding to each accommodating groove, and a heat dissipation structure and a refrigerant are arranged in the heat dissipation flat plate. Correspondingly, a flow structure is arranged on the liquid cooling plate, and the flow structure is used for circulating the coolant. During installation, the battery pack is placed in the accommodating space. At this time, the bottom of the battery pack contacts the above-mentioned liquid cooling plate, and the side surface of the battery pack contacts the side wall of the above-mentioned heat dissipation flat plate. During the actual working process, the above-mentioned heat dissipation flat plate can transfer the heat generated on the side surface of the battery pack to the above-mentioned liquid cooling plate through the heat dissipation structure and the refrigerant inside it. At this time, the liquid cooling plate can absorb the heat generated on the bottom and side surfaces of the battery pack through the coolant flowing inside it, so as to effectively absorb the heat generated by the above-mentioned battery pack, and further greatly improve the heat dissipation effect on the battery pack. At the same time, the heat dissipation is more uniform, effectively improving the service performance of the battery pack. In addition, the above-mentioned liquid cooling plate is connected to the air conditioning system. When the temperature of the battery pack is relatively low, the above-mentioned air conditioning system can be used to heat the coolant in the liquid cooling plate, so as to transfer the heat to a number of heat dissipation flat plates through the coolant, and then transfer the heat to the battery pack through a number of heat dissipation flat plates, so as to effectively increase the temperature of the battery pack and correspondingly improve the service performance of the battery pack.

[0009] Preferably, the heat dissipation flat plate includes a first cover plate and a second cover plate. A vacuum chamber is arranged in the second cover plate, and the heat dissipation structure and the refrigerant are arranged in the vacuum chamber. The first cover plate covers the vacuum chamber and is sealed with the second cover plate.

[0010] Preferably, the heat dissipation structure includes a steam chamber, a wick, and a number of convex platforms. The wick and the steam chamber are both arranged between a number of the convex platforms, and the steam chamber is located above the wick. The upper and lower ends of the convex platforms respectively abut against the inner side surfaces of the first cover plate and the second cover plate.

[0011] Preferably, the wick includes a number of pits and fins. The number of pits are arranged neatly in multiple rows and columns, and the fins are arranged around the pits.

[0012] Preferably, the fins include first fins and second fins. The first fins are arranged adjacent to the periphery of the pits, and the second fins are located between two adjacent convex platforms.

[0013] Preferably, the longitudinal thermal conductivity of the heat dissipation flat plate is greater than the transverse thermal conductivity, where the longitudinal thermal conductivity is 5000 w / mk and the transverse thermal conductivity is 0.1 w / mk.

[0014] Preferably, the interior of the liquid cooling plate is a hollow structure. The flow structure includes a liquid inlet provided at one end of the liquid cooling plate and a liquid outlet provided at the other end of the liquid cooling plate. The liquid inlet and the liquid outlet are used to circulate the coolant within the hollow structure.

[0015] Preferably, the coolant is made of an ethylene glycol - aqueous solution.

[0016] Preferably, the preparation method of the heat dissipation flat plate includes the following steps:

[0017] Select two identical plates as base materials, namely the first cover plate and the second cover plate. Process a vacuum cavity within the second cover plate, and arrange the heat dissipation structure and the refrigerant within the vacuum cavity.

[0018] Process mutually - matching grooves at the edges of the first cover plate and the second cover plate respectively, and seal the edges of the first cover plate and the second cover plate through laser welding.

[0019] Preferably, the preparation method of the liquid cooling plate includes the following steps:

[0020] Step S10: Place the first metal plate blank parallel to the pressure - bearing template, and make the flow - channel pattern of the pressure - bearing template located on one side of the first metal plate blank.

[0021] Step S20: Stamp - form one side of the first metal plate blank at the flow - channel pattern of the pressure - bearing template to form a number of the accommodating grooves on one side of the first metal plate blank.

[0022] Step S30: Separate the first metal plate blank from the pressure - bearing template to complete the forming process of the first metal plate blank.

[0023] Step S40: Repeat steps S10 to S30 to complete the forming process of the second metal plate blank.

[0024] Step S50: Stagger - arrange the sides with a number of the accommodating grooves of the first metal plate blank and the second metal plate blank in the same direction, and perform welding and bonding treatments on the edges of the first metal plate blank and the second metal plate blank to complete the processing of the liquid cooling plate.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of the power battery pack heat dissipation and heat preservation device provided by an embodiment of the present invention from the first perspective.

[0027] Figure 2 The structural schematic diagram of the heat dissipation and thermal insulation device for a power battery pack provided by an embodiment of the present invention from a second perspective;

[0028] Figure 3 The structural schematic diagram of the heat dissipation plate in the heat dissipation and thermal insulation device for a power battery pack provided by an embodiment of the present invention;

[0029] Figure 4 The connection schematic diagram of the heat dissipation and thermal insulation device for a power battery pack provided by an embodiment of the present invention and an air conditioning system.

[0030] Main element symbol description:

[0031] Liquid cooling plate 10 Radiating flat plate 20 Receiving groove 11 Receiving space 30 Battery pack 40 First cover plate 21 Second cover plate 22 Liquid outlet 13 Liquid inlet 12 Air conditioning system 50 Pressure relief valve 60 Heat insulation box 70 Heat preservation layer 80 Temperature sensor 90

[0032] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific Embodiments

[0033] For ease of understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present invention is thorough and comprehensive.

[0034] It should be noted that when an element is referred to as being "fixedly provided on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used herein in the description of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0036] Please refer to Figures 1 to 3, shown is a heat dissipation and thermal insulation device for a power battery pack provided by an embodiment of the present invention. The heat dissipation and thermal insulation device for the power battery pack provided by this embodiment can transfer the heat generated on the side of the battery pack to the liquid cooling plate through the heat dissipation structure inside the heat dissipation plate and the refrigerant. At this time, the liquid cooling plate can absorb the heat generated at the bottom and side of the above battery pack through the coolant flowing inside it, so as to effectively absorb the heat generated by the above battery pack, and then can greatly improve the heat dissipation effect of the battery pack. At the same time, the heat dissipation is more uniform, effectively improving the service performance of the battery pack.

[0037] Specifically, the heat dissipation and thermal insulation device for the power battery pack provided by this embodiment includes a liquid cooling plate 10 and a plurality of heat dissipation plates 20. A flow structure is provided on the liquid cooling plate 10 for circulating the coolant. A plurality of accommodation grooves 11 are provided in the middle of the liquid cooling plate 10, and the plurality of accommodation grooves 11 are staggered and distributed on the upper and lower surfaces of the liquid cooling plate 10. One end of the heat dissipation plate 20 is vertically arranged in the accommodation groove 11. A heat dissipation structure and a refrigerant flowing in the heat dissipation structure are provided in the heat dissipation plate 20. The heat dissipation structure and the refrigerant are used to transfer the heat received by the heat dissipation plate 20 to the liquid cooling plate 10. An accommodation space 30 is formed between two adjacent heat dissipation plates 20 for storing the battery pack 40. In addition, the liquid cooling plate 10 is communicated with the air conditioning system 50. When the temperature of the battery pack 40 is relatively low, the air conditioning system 50 is used to heat the coolant in the liquid cooling plate 10, so as to transfer the heat to a plurality of heat dissipation plates 20 through the coolant, and the heat dissipation plates 20 transfer the heat to the battery pack 40.

[0038] Among them, as Figures 1 to 3 shown, it should be noted that the overall structure of the heat dissipation and thermal insulation device for the power battery pack provided by this embodiment is mainly composed of a liquid cooling plate 10 and a plurality of heat dissipation plates 20. Among them, in this embodiment, in order to initially and effectively absorb the heat generated by the battery pack 40, the above liquid cooling plate 10 is made of aluminum. It can be understood that metal aluminum has good thermal conductivity. In this embodiment, the good thermal conductivity characteristics of metal aluminum are utilized to effectively transfer the heat generated at the end (i.e., the bottom or the top) of the above battery pack 40 to the liquid cooling plate 10, and then the heat generated by the battery pack 40 is quickly taken away by the coolant flowing inside the liquid cooling plate 10, so as to perform effective heat dissipation.

[0039] Furthermore, in this embodiment, it should be pointed out that the above heat dissipation plate 20 is made of magnesium alloy. Those skilled in the art can understand that magnesium alloy has good corrosion resistance, high strength and good thermal conductivity. Therefore, in this embodiment, as Figure 1 and Figure 2As shown, the above-mentioned heat dissipation flat plate 20 can effectively transfer the heat generated on the side of the battery pack 40 to the heat dissipation structure and refrigerant inside it, and then transfer the heat to the liquid cooling plate 10 through the heat dissipation structure and refrigerant, so as to take away the heat generated on the side of the battery pack 40 by the coolant flowing inside the liquid cooling plate 10.

[0040] Furthermore, in this embodiment, as Figures 1 to 3 shown, it should also be noted that, for the convenience of installing the liquid cooling plate 10 and several heat dissipation flat plates 20, obviously, several accommodation grooves 11 are provided in the middle of the liquid cooling plate 10, and several accommodation grooves 11 are distributed vertically and alternately on the upper and lower surfaces of the liquid cooling plate 10. Further, one end of each heat dissipation flat plate 20 is correspondingly and vertically arranged in each accommodation groove 11, so that an accommodation space 30 can be formed between adjacent two heat dissipation flat plates 20. During implementation, this accommodation space 30 is used to place the battery pack 40. Preferably, in this embodiment, the accommodation groove 11 is set as a U-shaped groove. The size of the U-shaped groove is adapted to the end size of the heat dissipation flat plate 20. During installation, as Figure 1 and Figure 2 shown, each battery pack 40 is correspondingly placed in each accommodation space 30. At this time, the bottom or top of the battery pack 40 can contact the liquid cooling plate 10, and the side of the battery pack 40 can contact the heat dissipation flat plate 20, and then the battery pack 40 can be effectively cooled.

[0041] In this embodiment, it should be noted that by distributing several accommodation grooves 11 vertically and alternately on the upper and lower surfaces of the liquid cooling plate 10, the heat exchange area between the heat dissipation flat plate 20 and the liquid cooling plate 10 can be increased, and at the same time, the turbulence of the coolant flowing inside the liquid cooling plate 10 can be strengthened, thereby destroying the boundary layer between the fluid and the serrations, increasing the convective heat transfer coefficient, and further strengthening the heat dissipation.

[0042] In addition, in this embodiment, as Figure 3 shown, it should also be noted that, in order to further improve the heat dissipation effect, the heat dissipation flat plate 20 includes a first cover plate 21 and a second cover plate 22. Specifically, a vacuum chamber is provided in the second cover plate 22, and a heat dissipation structure and refrigerant are provided in this vacuum chamber. During installation, the first cover plate 21 covers the above-mentioned vacuum chamber and is sealed with the second cover plate 22. Preferably, in this embodiment, the first cover plate 21 and the second cover plate 22 are sealed by welding. Further, it should be pointed out that the above-mentioned heat dissipation structure includes a vapor chamber (not shown in the figure), a wick (not shown in the figure), and several bosses (not shown in the figure). Among them, the above-mentioned wick and the above-mentioned vapor chamber are both provided between several above-mentioned bosses, and the above-mentioned vapor chamber is located above the above-mentioned wick, and the upper and lower ends of the above-mentioned bosses respectively abut against the inner sides of the first cover plate 21 and the second cover plate 22.

[0043] Furthermore, in the present embodiment, it should be noted that, in order to facilitate heat dissipation, the above-mentioned liquid absorbent core includes a plurality of pits (not shown) and fins (not shown). Specifically, the above-mentioned plurality of pits are neatly arranged in multiple rows and columns, and the above-mentioned fins are arranged around each pit. In addition, the above-mentioned fins include a first fin (not shown) and a second fin (not shown), wherein the above-mentioned first fin is arranged adjacent to the surroundings of the above-mentioned pit, and the above-mentioned second fin is located between two adjacent above-mentioned bosses. At the same time, in the present embodiment, it should also be noted that the longitudinal thermal conductivity of the above-mentioned heat dissipation plate 20 is greater than the transverse thermal conductivity, wherein the longitudinal thermal conductivity is 5000w / mk, and the transverse thermal conductivity is 0.1w / mk, thereby being able to effectively improve.

[0044] In addition, in the present embodiment, in order to facilitate the heat dissipation of the liquid cooling plate 10, the interior of the liquid cooling plate 10 is set as a hollow structure. Correspondingly, the above-mentioned flow structure includes a liquid inlet 12 arranged at one end of the liquid cooling plate 10, and a liquid outlet 13 arranged at the other end of the liquid cooling plate 10. During implementation, the liquid inlet 12 and the liquid outlet 13 are used to circulate the cooling liquid in the above-mentioned hollow structure, so that the cooling liquid can be effectively circulated quickly inside the liquid cooling plate 10 to take away the heat generated by the battery pack 40.

[0045] In addition, in this embodiment, it should be noted that, preferably, in this embodiment, the coolant is made of ethylene glycol-water solution to reduce production costs.

[0046] Furthermore, in this embodiment, if Figure 4 As shown, it should be noted that the power battery pack heat dissipation and heat preservation device provided in this embodiment will be connected to the air-conditioning system 50 inside the car during actual use, wherein the liquid inlet 12 and the liquid outlet 13 of the liquid cooling plate 10 are respectively connected to the liquid outlet and the liquid inlet of the above-mentioned air-conditioning system 50, thereby forming a closed loop circuit of the power battery pack heat dissipation and heat preservation device and the air-conditioning system 50, and the closed loop circuit is used to circulate the coolant.

[0047] Specifically, in this embodiment, in order to accurately sense the temperature of the liquid cooling plate 10, a temperature sensor 90 is further installed at one end of the liquid cooling plate 10, and the temperature sensor 90 is electrically connected to the controller inside the air conditioning system 50. Among them, when the temperature sensor 90 detects that the temperature of the liquid cooling plate 10 is relatively low, it indicates that the temperature of the battery pack is relatively low. At this time, the air conditioning system 50 will perform heating to increase the temperature of the coolant and make the coolant transfer heat to the battery pack; when the temperature sensor 90 detects that the temperature of the liquid cooling plate 10 is relatively high, it indicates that the temperature of the battery pack is relatively high. At this time, the air conditioning system will perform cooling to reduce the temperature of the coolant and make the coolant absorb the heat of the battery pack, thereby effectively improving the performance of the battery pack. In addition, the temperature sensor 90 can also accurately sense the temperature difference inside the single battery pack 40, and through the control strategy of the air conditioning system 50, the feed temperature and feed flow rate of the coolant in the corresponding reasonable balance inlet 12 can be adjusted, which can effectively reduce the start-stop frequency of the entire air conditioning system 50 and improve the service life and efficiency of the air conditioning system 50 and the battery pack 40.

[0048] In addition, in this embodiment, as Figure 4 shown, it should also be noted that the air conditioning system 50 further includes a pressure relief valve 60, and the pressure relief valve 60 is provided on the heat insulation box 70. During use, the pressure relief valve 60 is used to discharge the gas generated by the battery pack 40 during charging and discharging to balance the pressure difference inside the heat insulation box 70. Further, a heat insulation layer 80 is further coated on the periphery of the heat insulation box 70.

[0049] During use, a plurality of accommodating grooves 11 are alternately arranged on the upper and lower surfaces of the liquid cooling plate 10. During installation, one end of each heat dissipation flat plate 20 is vertically arranged in each accommodating groove 11 correspondingly, and a heat dissipation structure and a refrigerant are arranged inside the heat dissipation flat plate 20. Correspondingly, a flow structure is arranged on the liquid cooling plate 10, and the flow structure is used to circulate the coolant. During installation, the battery pack 40 is placed in the accommodating space 30. At this time, the bottom of the battery pack 40 is in contact with the liquid cooling plate 10, and the side surface of the battery pack 40 is in contact with the side wall of the heat dissipation flat plate 20. During the actual working process, the heat dissipation flat plate 20 can transfer the heat generated on the side surface of the battery pack 40 to the liquid cooling plate 10 through the heat dissipation structure and the refrigerant inside it. At this time, the liquid cooling plate 10 can absorb the heat generated on the bottom and side surfaces of the battery pack 40 through the coolant flowing inside it, thereby effectively absorbing the heat generated by the battery pack 40, and further greatly improving the heat dissipation effect on the battery pack 40, while the heat dissipation is more uniform, effectively improving the performance of the battery pack 40.

[0050] In addition, in this embodiment, it should also be pointed out that the preparation method of the heat dissipation flat plate 20 provided in this embodiment includes the following steps:

[0051] Select two identical plates as the base materials, namely the first cover plate 21 and the second cover plate 22 respectively. A vacuum chamber is machined in the second cover plate 22, and the above heat dissipation structure and the above refrigerant are arranged in the vacuum chamber.

[0052] Grooves that cooperate with each other are machined on the edges of the first cover plate 21 and the second cover plate 22 respectively, and the edges of the first cover plate 21 and the second cover plate 22 are sealed by laser welding.

[0053] In addition, in this embodiment, it should also be pointed out that the preparation method of the liquid cooling plate 10 provided in this embodiment includes the following steps:

[0054] Step S10: Place the first metal plate blank parallel to the pressure-bearing template, and make the flow channel pattern of the pressure-bearing template located on one side of the first metal plate blank.

[0055] Step S20: Stamp and form one side of the first metal plate blank at the flow channel pattern of the pressure-bearing template to form a plurality of the accommodating grooves on one side of the first metal plate blank.

[0056] Step S30: Separate the first metal plate blank from the pressure-bearing template to complete the forming process of the first metal plate blank.

[0057] Step S40: Repeat steps S10 to S30 to complete the forming process of the second metal plate blank.

[0058] Step S50: The sides of the first metal plate blank and the second metal plate blank where a plurality of the accommodating grooves are punched are arranged staggeredly in the same direction, and the edges of the first metal plate blank and the second metal plate blank are welded and bonded to complete the processing of the liquid cooling plate.

[0059] It should be noted that the above implementation process is only to illustrate the feasibility of this application, but this does not mean that the power battery pack heat dissipation and insulation device of this application has only the above-mentioned unique implementation process. On the contrary, as long as the power battery pack heat dissipation and insulation device of this application can be implemented, it can be included in the feasible implementation schemes of this application.

[0060] In summary, the power battery pack heat dissipation and insulation device in the above embodiments of the present invention can effectively absorb the heat generated by the above battery pack 40, thereby greatly improving the heat dissipation effect on the battery pack 40. At the same time, the heat dissipation is more uniform, effectively improving the service performance of the battery pack 40.

[0061] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0062] The above-described embodiments merely represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A heat dissipation and thermal insulation device for a power battery pack, characterized in that: It includes a liquid cooling plate and several heat dissipation flat plates. A flow structure is provided on the liquid cooling plate for circulating a coolant. Several accommodation grooves are provided in the middle of the liquid cooling plate, and the several accommodation grooves are staggered on the upper and lower surfaces of the liquid cooling plate. One end of the heat dissipation flat plate is vertically arranged in the accommodation groove. A heat dissipation structure and a refrigerant flowing in the heat dissipation structure are provided in the heat dissipation flat plate. The heat dissipation structure and the refrigerant are used to transfer the heat received by the heat dissipation flat plate to the liquid cooling plate. An accommodation space is formed between two adjacent heat dissipation flat plates for storing a battery pack. The liquid cooling plate is communicated with an air conditioning system. When the temperature of the battery pack is relatively low, the air conditioning system is used to heat the coolant in the liquid cooling plate so as to transfer the heat to several heat dissipation flat plates through the coolant, and the heat dissipation flat plates transfer the heat to the battery pack; The heat dissipation flat plate includes a first cover plate and a second cover plate. A vacuum chamber is provided in the second cover plate, and the heat dissipation structure and the refrigerant are provided in the vacuum chamber. The first cover plate covers the vacuum chamber and is sealed with the second cover plate.

2. The heat dissipation and insulation device for the power battery pack according to claim 1, wherein: The heat dissipation structure includes a vapor chamber, a wick, and several bosses. The wick and the vapor chamber are both arranged between the several bosses, and the vapor chamber is located above the wick. The upper and lower ends of the boss respectively abut against the inner sides of the first cover plate and the second cover plate.

3. The heat dissipation and thermal insulation device for the power battery pack according to claim 2, wherein: The wick includes several pits and fins. The several pits are arranged neatly in multiple rows and columns, and the fins are arranged around the pits.

4. The heat dissipation and thermal insulation device for the power battery pack according to claim 3, wherein: The fins include first fins and second fins. The first fins are arranged adjacent to the periphery of the pits, and the second fins are located between two adjacent bosses.

5. The heat dissipation and heat preservation device for a power battery pack according to claim 1, wherein: The longitudinal thermal conductivity of the heat dissipation flat plate is greater than the transverse thermal conductivity. Among them, the longitudinal thermal conductivity is 5000 w / mk, and the transverse thermal conductivity is 0.1 w / mk.

6. The heat dissipation and thermal insulation device for a power battery pack according to claim 1, wherein: The interior of the liquid cooling plate is a hollow structure. The flow structure includes an inlet provided at one end of the liquid cooling plate and an outlet provided at the other end of the liquid cooling plate. The inlet and the outlet are used to circulate the coolant in the hollow structure.

7. The heat dissipation and thermal insulation device for a power battery pack according to claim 1, wherein: The coolant is made of an ethylene glycol - aqueous solution.

8. The heat dissipation device for the power battery pack according to claim 1, wherein: The preparation method of the heat dissipation flat plate includes the following steps: Select two identical plates as base materials, namely the first cover plate and the second cover plate. Process a vacuum chamber in the second cover plate, and arrange the heat dissipation structure and the refrigerant in the vacuum chamber; Process mutually matching grooves on the edges of the first cover plate and the second cover plate respectively, and seal the edges of the first cover plate and the second cover plate by laser welding.

9. The heat dissipation and heat preservation device for the power battery pack according to claim 1, characterized in that: The preparation method of the liquid cooling plate includes the following steps: Step S10, place the first metal plate blank parallel to the pressure-bearing template, and make the flow channel pattern of the pressure-bearing template located on one side of the first metal plate blank; Step S20, punch and form one side of the first metal plate blank at the flow channel pattern of the pressure-bearing template to form several accommodation grooves on one side of the first metal plate blank; Step S30: Separate the first metal slab from the pressure-bearing template to complete the forming process of the first metal slab; Step S40: Repeat Step S10 to Step S30 to complete the forming process of the second metal slab; Step S50: Stamp the first metal slab and the second metal slab so that one side of a number of the accommodating grooves are arranged staggeredly in the same direction, and perform welding and bonding treatments on the edges of the first metal slab and the second metal slab to complete the processing of the liquid cooling plate.

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