Energy storage device and new energy vehicle

Abstract

The application relates to the technical field of heat dissipation devices, and provides an energy accumulator and a new energy automobile. The energy accumulator comprises a cylinder body, a plurality of fins and a plurality of heat exchange pipes, the cylinder body is internally provided with the plurality of fins, the plurality of fins are sequentially stacked along the length direction of the cylinder body, each fin is provided with a first through hole and a second through hole, the first through holes on the plurality of fins and located on the same straight line form a flow channel, and the flow channel is used for injecting phase change material; each heat exchange pipe is arranged in the second through hole on the plurality of fins and located on the same straight line, and the heat exchange pipe is used for injecting at least one kind of heat exchange medium; and the heat exchange medium can exchange heat with the phase change material, so that the cylinder body is internally stored with cold energy or heat energy. The energy accumulator utilizes the heat release or heat absorption of the phase change material during phase change to store certain cold energy or heat energy in the cylinder body, and together with a battery heat exchange device, the battery is cooled or heated, so that the heat exchange capacity of the battery heat exchange device does not need to be greatly improved, and the cost of the new energy automobile is reduced.

Description

Technical Field

[0001] This invention relates to the field of heat dissipation equipment technology, and more particularly to an energy storage device and a new energy vehicle. Background Technology

[0002] With the development of new energy vehicle technology, people's requirements for vehicle range and fast charging performance are constantly increasing. Battery capacity has increased from 40kWh to 150kWh or even higher. Fast charging time has been shortened from 85-120 minutes to 15 minutes. The increase in battery capacity and the shortening of charging time have led to a surge in battery heat generation in a short period of time, posing a significant challenge to the thermal management of the entire vehicle.

[0003] When a vehicle is fast-charging, it is stationary and the ventilation of the thermal management system is relatively small. To meet the 15-minute fast-charging requirement in both high and low temperature environments, the power of heat exchangers, fans, and water pumps needs to be increased several times over, resulting in high cost and poor economic efficiency for the thermal management system of new energy vehicles. When the fast-charging demand of vehicles increases further, the existing heat dissipation devices still cannot meet the heat dissipation requirements of the vehicle's thermal management system. Summary of the Invention

[0004] This invention provides an energy storage device and a new energy vehicle to solve the shortcomings of existing vehicle thermal management systems that cannot meet the heat dissipation requirements during fast charging.

[0005] This invention provides an energy storage device, comprising: a cylindrical body, wherein a plurality of fins are disposed within the cylindrical body, the plurality of fins being stacked sequentially along the length direction of the cylindrical body, each fin having at least one first through hole and at least one second through hole, the plurality of first through holes on the plurality of fins being aligned in a straight line forming a flow channel for injecting a phase change material; and at least one heat exchange tube, the heat exchange tube being inserted into the plurality of second through holes on the plurality of fins being aligned in a straight line, the heat exchange tube being used to inject at least one heat exchange medium; wherein the heat exchange medium can exchange heat with the phase change material to store cold or heat within the cylindrical body.

[0006] According to an energy storage device provided by the present invention, the cylinder includes: a baffle, at least one end of the heat exchange tube passing through the baffle and extending outside the baffle; and an inner cylinder sleeved outside the heat exchange tube, wherein the baffle is disposed inside the inner cylinder to enclose the phase change material inside the inner cylinder.

[0007] According to an energy storage device provided by the present invention, the cylinder further includes: an end cap disposed inside the inner cylinder and located on one side of the baffle, the end cap being connected to the baffle, and the end cap having at least one pipe joint communicating with the heat exchange tube.

[0008] According to an energy storage device provided by the present invention, the cylinder further includes: an outer cylinder, which is sleeved on the outside of the inner cylinder; and a sealing ring, which is used to seal the gap between the outer cylinder and the inner cylinder so that the space between the outer cylinder and the inner cylinder forms a vacuum insulation layer.

[0009] According to an energy storage device provided by the present invention, the sealing ring has an annular groove, and the outer cylinder and the inner cylinder are embedded in the annular groove.

[0010] According to an energy storage device provided by the present invention, the outer surface of the outer cylinder is coated with a heat-insulating coating.

[0011] According to an energy storage device provided by the present invention, an isolation ring is further included, the isolation ring being disposed between the outer cylinder and the inner cylinder.

[0012] The present invention also provides a new energy vehicle, including a battery, a liquid cooling plate and an energy storage device as described above, wherein the liquid cooling plate is disposed inside the battery and the liquid cooling plate is connected to the energy storage device.

[0013] According to the present invention, a new energy vehicle further includes: a thermal management system connected to the energy storage device via a first pipeline; and a valve disposed on the first pipeline.

[0014] According to a new energy vehicle provided by the present invention, the valve is a three-way valve, the first valve port of the three-way valve is connected to the thermal management system, the second valve port of the three-way valve is connected to the energy storage device, and the third valve port of the three-way valve is connected to the liquid cooling plate through a second pipeline.

[0015] The energy storage device provided in this invention forms a flow channel in the fins and injects a phase change material into the flow channel. The phase change material releases or absorbs heat during phase change and stores a certain amount of cold or heat in the cylinder. Together with the battery heat exchange device, it cools or heats the battery, keeping the battery temperature within a suitable range. This eliminates the need to significantly increase the heat exchange capacity of the battery heat exchange device, reducing the cost and material consumption of new energy vehicles and lowering the overall vehicle thermal management energy consumption. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the energy storage device provided by the present invention;

[0018] Figure 2This is one of the internal structural schematic diagrams of the energy storage device provided by the present invention;

[0019] Figure 3 This is the second schematic diagram of the internal structure of the energy storage device provided by the present invention;

[0020] Figure 4 yes Figure 3 The diagram shows the structure of the baffle.

[0021] Figure 5 This is the front view of the fin;

[0022] Figure 6 yes Figure 2 The diagram shows the structure of the end cap;

[0023] Figure 7 yes Figure 2 The diagram shows the structure of the sealing ring;

[0024] Figure 8 This is a cross-sectional view of the energy storage device provided by the present invention;

[0025] Figure 9 This is a schematic diagram showing the connection relationship between the thermal management system and the energy storage device in a new energy vehicle provided by the present invention;

[0026] Figure label:

[0027] 10: Outer cylinder; 20: Fin; 21: First through hole; 22: Second through hole; 30: Heat exchange tube; 40: Baffle; 50: Inner cylinder; 60: Isolation ring; 70: End cap; 71: Pipe joint; 80: Sealing ring; 81: Groove; 100: Energy storage device; 200: Thermal management system; 300: Battery; 400: Valve; 500: Electric water pump. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0029] The terms "first" and "second" in the specification and claims of this invention may explicitly or implicitly include one or more of those features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0030] The following is combined Figures 1-9 The present invention describes an energy storage device and a new energy vehicle.

[0031] like Figure 1 , Figure 3 and Figure 5 As shown, in an embodiment of the present invention, the energy storage device 100 includes: a cylindrical body, a plurality of fins 20, and at least one heat exchange tube 30. The cylindrical body has a plurality of fins 20 arranged sequentially along the length of the cylindrical body. Each fin 20 has at least one first through-hole 21 and at least one second through-hole 22. The plurality of first through-holes 21 on the plurality of fins 20, located in a straight line, form a flow channel for injecting a phase change material. Each heat exchange tube 30 passes through the plurality of second through-holes 22 on the plurality of fins 20, located in a straight line, and is used to inject at least one heat exchange medium. The heat exchange medium can exchange heat with the phase change material to store cold or heat within the cylindrical body.

[0032] Specifically, in this embodiment, the phase change material is located within the flow channel, and the heat exchange medium is located within the heat exchange tube 30. The phase change material and the heat exchange medium exchange heat through the fins 20, resulting in a large heat exchange area and strong heat exchange effect. The phase change material utilizes phase change to release or absorb heat, thereby storing a certain amount of cold or heat within the energy storage device 100. The cold energy can cool the battery 300 during fast charging, reducing the cell temperature of the battery 300; while the heat energy can heat the battery 300 when heating is required, maintaining the battery 300 temperature within a suitable temperature range.

[0033] Specifically, in this embodiment, the phase change material is a solid-liquid phase change material. When the temperature of the heat exchange medium in the heat exchange tube 30 is low, the heat exchange medium absorbs the heat of the phase change material, and the phase change material releases heat and becomes solid. The energy storage device 100 stores a certain amount of cold energy, which can cool the battery 300 during fast charging. When the temperature of the heat exchange medium in the heat exchange tube 30 is high, the phase change material absorbs the heat of the heat exchange medium, and the phase change material absorbs heat and becomes liquid. The energy storage device 100 stores a certain amount of heat, which can heat the battery 300.

[0034] Optionally, when the energy storage device 100 is used to cool and heat the battery 300, a phase change material with a phase change critical temperature of about 28°C can be selected, which can keep the temperature of the battery 300 at around 28°C. When the phase change material absorbs heat, its temperature is about 20°C, which is lower than the temperature of the battery 300, and can cool the battery 300. When the phase change material releases heat, its temperature is about 36°C, which is higher than the temperature of the battery 300, and can heat the battery 300.

[0035] Furthermore, in embodiments of the present invention, the heat exchange medium can be one or more, that is, one heat exchange medium is introduced into part of the heat exchange tube 30, and another heat exchange medium is introduced into part of the heat exchange tube 30. Specifically, for some new energy vehicles, coolant is introduced into part of the heat exchange tube 30, and refrigerant is introduced into part of the heat exchange tube 30. In winter, the coolant can be used to provide heat for heating the battery 300, and in summer, the refrigerant can be used to provide cooling for cooling the battery 300, thereby improving the applicability of the energy storage device 100. Furthermore, when multiple heat exchange media are introduced into the heat exchange tube 30, the energy storage device 100 can also provide cooling for multiple devices simultaneously.

[0036] It should be noted that the energy storage device provided in this embodiment of the invention is not limited to cooling or heating the batteries of new energy vehicles. It can also be applied to other industries, such as servers, to cool the heat-generating components inside the server.

[0037] The energy storage device provided in this invention forms a flow channel in the fins and injects a phase change material into the flow channel. The phase change material releases or absorbs heat during phase change and stores a certain amount of cold or heat in the cylinder. Together with the battery heat exchange device, it cools or heats the battery, keeping the battery temperature within a suitable range. This eliminates the need to significantly increase the heat exchange capacity of the battery heat exchange device, reducing the cost and material consumption of new energy vehicles and lowering the overall vehicle thermal management energy consumption.

[0038] like Figure 2 and Figure 3 As shown, in an embodiment of the present invention, the cylinder includes a baffle 40 and an inner cylinder 50. At least one end of the heat exchange tube 30 passes through the baffle 40 and extends beyond the baffle 40. The inner cylinder 50 is sleeved on the outside of the plurality of heat exchange tubes 30, and the baffle 40 is disposed inside the inner cylinder 50 to enclose the phase change material within the inner cylinder 50.

[0039] Specifically, in the embodiments of the present invention, the number of baffles 40 can be one or a pair. When one end of the inner cylinder 50 is closed and the other end is open, the number of baffles 40 is one, the fins 20 are disposed inside the inner cylinder 50, the baffle 40 is disposed at the open end of the inner cylinder 50 and is brazed to the inner wall of the inner cylinder 50, and both ends of the heat exchange tube 30 pass through the baffle 40. The baffle 40 seals the phase change material inside the inner cylinder 50.

[0040] When both ends of the inner cylinder 50 are open, there is a pair of baffles 40. The fins 20, heat exchange tubes 30 and the pair of baffles 40 are all located inside the inner cylinder 50. The pair of baffles 40 are located on both sides of the multiple fins 20. The two ends of the heat exchange tubes 30 pass through the two baffles 40 and extend beyond the pair of baffles 40. The baffles 40 are brazed to the inner wall of the inner cylinder 50 so that the space between the pair of baffles 40 becomes a closed space, and the phase change material is located in this closed space.

[0041] like Figure 4 As shown, in an embodiment of the present invention, the baffle 40 is a box structure with a bottom surface and a plurality of third through holes. The heat exchange tube 30 passes through the third through holes, and the other end of the baffle 40 is an open end.

[0042] like Figure 2 As shown, in an embodiment of the present invention, the cylinder further includes an end cap 70, which is disposed inside the inner cylinder 50 and located on one side of the baffle 40. The end cap 70 is connected to the baffle 40, and the end cap 70 is provided with at least one pipe joint 71, which is connected to a plurality of heat exchange tubes 30.

[0043] Specifically, such as Figure 6 As shown, the end cap 70 is also a box structure, with a bottom surface at one end and an open end at the other end. The bottom surface of the end cap 70 is provided with at least one pipe joint 71. The open end of the end cap 70 matches the open end of the baffle 40 in size so that the two can be connected.

[0044] Optionally, in an embodiment of the present invention, the number of end caps 70 matches the number of baffles 40. When one end of the inner cylinder 50 is open, the number of end caps 70 is one. The end cap 70 is provided with at least one pair of pipe joints 71. Two of the pipe joints 71 in each pair are liquid inlet joints and liquid outlet joints. The two ends of the liquid inlet joint are respectively connected to the thermal management system 200 of the new energy vehicle and the first end of the heat exchange tube 30 for injecting heat exchange medium. The liquid outlet joint is connected to the second end of the heat exchange tube 30.

[0045] When both ends of the inner cylinder 50 are open, there are two end caps 70. Each end cap 70 is provided with at least one pipe connector 71. The pipe connectors 71 on one end cap 70 are all liquid inlet connectors, while the pipe connectors 71 on the other end cap 70 are all liquid outlet connectors. Further, in an embodiment of the present invention, the end caps 70 are brazed to the inner wall of the inner cylinder 50.

[0046] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the cylinder further includes an outer cylinder 10 and a sealing ring 80. The outer cylinder 10 is sleeved on the outside of the inner cylinder 50, and the sealing ring 80 is used to seal the gap between the outer cylinder 10 and the inner cylinder 50, so that the space between the outer cylinder 10 and the inner cylinder 50 forms a vacuum insulation layer.

[0047] Specifically, the outer cylinder 10 is fitted outside the inner cylinder 50, and there is a certain gap between the inner wall of the outer cylinder 10 and the outer wall of the inner cylinder 50. The sealing ring 80 is set on one or both sides of the outer cylinder 10, so that the space between the inner cylinder 50 and the outer cylinder 10 becomes a vacuum insulation layer, which can prevent the loss of cold or heat in the inner cylinder 50.

[0048] Furthermore, in an embodiment of the present invention, the outer surface of the outer cylinder 10 is coated with a heat-insulating coating so that the energy storage device 100 has a heat-insulating effect and prevents the loss of cold or heat.

[0049] Optionally, such as Figure 7 As shown, in one embodiment of the present invention, the sealing ring 80 has an annular groove 81, and the outer cylinder 10 and the inner cylinder 50 are embedded in the annular groove 81.

[0050] Specifically, in this embodiment, the sealing ring 80 is an annular part, and an annular groove 81 is machined on the surface of the annular part. The width of the annular groove 81 is adapted to the distance between the inner wall of the inner cylinder 50 and the outer wall of the outer cylinder 10, so that the sealing ring 80 seals the gap between the outer cylinder 10 and the inner cylinder 50, thereby forming a vacuum layer between the outer cylinder 10 and the inner cylinder 50.

[0051] Optionally, in another embodiment of the present invention, the sealing ring 80 is an annular member with an annular protrusion on its surface. The width of the annular protrusion is adapted to the gap between the outer cylinder 10 and the inner cylinder 50. The annular protrusion is inserted into the gap between the outer cylinder 10 and the inner cylinder 50 to seal the gap between the outer cylinder 10 and the inner cylinder 50, thereby forming a vacuum layer between the outer cylinder 10 and the inner cylinder 50.

[0052] like Figure 2 and Figure 8 As shown, in an embodiment of the present invention, the energy storage device 100 further includes an isolation ring 60, which is disposed between the outer cylinder 10 and the inner cylinder 50. In this embodiment, the isolation ring 60 is made of a material with low thermal conductivity to reduce the conduction of cold or heat. Furthermore, in this embodiment, the isolation ring 60 also provides support for the outer cylinder 10, preventing it from collapsing inward under external force, thus avoiding damage to the vacuum insulation layer between the inner cylinder 50 and the outer cylinder 10 and reducing the insulation effect.

[0053] This invention also provides a new energy vehicle, including a battery 300, a liquid cooling plate, and an energy storage device 100. The liquid cooling plate is disposed inside the battery 300 and is connected to the energy storage device 100.

[0054] Specifically, the liquid outlet of the liquid cooling plate is connected to one pipe joint 71 of the energy storage device 100, and the liquid inlet of the liquid cooling plate is connected to another pipe joint 71 of the energy storage device 100 to form a circulation loop. The energy storage device 100 stores a certain amount of cold or heat. When the battery 300 is fast-charging, the liquid in the liquid cooling plate absorbs the heat from the battery 300 and enters the heat exchange tube 30 of the energy storage device 100 to exchange heat with the phase change material. The phase change material absorbs the heat from the liquid, and the cooled liquid flows back into the liquid cooling plate to continue absorbing the heat from the battery 300, thereby cooling the battery 300.

[0055] When the battery 300 needs to be heated, the liquid in the liquid cooling plate enters the heat exchange tube 30 of the energy storage device 100 to exchange heat with the phase change material. The liquid absorbs the heat from the phase change material and flows back into the liquid cooling plate to heat the battery 300.

[0056] The new energy vehicle provided by the present invention can utilize the heat release or absorption of phase change materials during phase change to store a certain amount of cold or heat in the energy storage device to cool or heat the battery, so that the battery temperature is kept within a suitable range. This eliminates the need to significantly increase the heat exchange capacity of the battery heat exchange device, thereby reducing the cost and material consumption of the new energy vehicle and reducing the overall vehicle thermal management energy consumption.

[0057] like Figure 9 As shown, in an embodiment of the present invention, the new energy vehicle further includes a thermal management system 200 and a valve 400. The thermal management system 200 is connected to the energy storage device 100 via a first pipeline, and the valve 400 is disposed on the first pipeline.

[0058] Specifically, in high-temperature environments, before a new energy vehicle needs fast charging or generates a large amount of heat, valve 400 is opened, connecting the thermal management system 200 to the energy storage device 100. The thermal management system 200 injects at least one heat exchange medium into the heat exchange tube 30 of the energy storage device 100. After heat exchange between the phase change material and the heat exchange medium, the phase change material changes from liquid to solid. When the phase change material no longer releases heat, valve 400 is closed. At this time, a certain amount of cold energy can be stored in the energy storage device 100. Because the energy storage device 100 has a vacuum insulation layer, the internal cold energy is not easily lost. Furthermore, in this embodiment, the temperature of the liquid entering and exiting the two pipe joints 71 can be used to determine whether the phase change material is still releasing heat. When the temperature difference between the liquid entering and exiting the two pipe joints is small, valve 400 can be closed. During fast charging of new energy vehicles, the energy storage device 100 is connected to the liquid cooling plate of the battery 300. The liquid with a higher temperature in the liquid cooling plate enters the heat exchange tube 30 of the energy storage device 100 and exchanges heat with the phase change material in the flow channel. The phase change material absorbs the heat of the liquid, and the cooled liquid flows back to the liquid cooling plate to cool the battery 300.

[0059] In low-temperature environments, when the battery 300 of a new energy vehicle requires high-power heating, valve 400 is opened, and the thermal management system injects at least one medium-temperature heat exchange medium into the energy storage device 100. The phase change material absorbs heat upon contact with the medium-temperature heat exchange medium, changing from a solid to a liquid. When the phase change material no longer absorbs heat, valve 400 is closed. At this time, a certain amount of heat will be stored in the energy storage device 100. When the battery 300 requires high-power heating during fast charging or other operating conditions of the new energy vehicle, the energy storage device 100 is connected to the liquid cooling plate of the battery 300. The cooler liquid in the liquid cooling plate enters the heat exchange tube 30 of the energy storage device 100 and exchanges heat with the phase change material in the flow channel. The liquid absorbs the heat from the phase change material, and the heated liquid flows back into the liquid cooling plate to heat the battery 300.

[0060] Furthermore, in this embodiment, the method for determining that the phase change material no longer absorbs heat is the same as the method for determining that the phase change material no longer releases heat.

[0061] Furthermore, such as Figure 9 As shown, in an embodiment of the present invention, valve 400 is a three-way valve. The first valve port of the three-way valve is connected to the thermal management system 200, the second valve port of the three-way valve is connected to the energy storage device 100, and the third valve port of the three-way valve is connected to the liquid cooling plate through a second pipeline.

[0062] Specifically, in high-temperature environments, before a new energy vehicle requires fast charging or generates significant heat, the first and second valve ports of valve 400 are opened, and the third valve port is closed. The thermal management system 200 is connected to the energy storage device 100. The thermal management system 200 injects a low-temperature heat exchange medium into the heat exchange tubes 30 of the energy storage device 100. After heat exchange between the phase change material and the low-temperature heat exchange medium, the phase change material changes from liquid to solid. When the phase change material no longer releases heat, the second valve port of valve 400 is closed. At this time, a certain amount of cold energy can be stored in the energy storage device 100. Because the energy storage device 100 has a vacuum insulation layer, the internal cold energy is not easily lost. During fast charging of the new energy vehicle, the energy storage device 100 is connected to the liquid cooling plate of the battery 300. The high-temperature liquid in the liquid cooling plate enters the heat exchange tubes 30 of the energy storage device 100 and exchanges heat with the phase change material in the flow channel. The phase change material absorbs the heat from the liquid, and the cooled liquid flows back to the liquid cooling plate to cool the battery 300. At the same time, the third valve port of valve 400 is opened, and the heat exchange medium with a lower temperature in the thermal management system 200 directly enters the liquid cooling plate through the second pipeline, so as to cool the battery 300 at the same time as the energy storage device 100, thereby improving the cooling effect of the battery 300.

[0063] In low-temperature environments, when the battery 300 of a new energy vehicle requires high-power heating, the first and second valve ports of valve 400 are opened, and the third valve port is closed. The thermal management system 200 injects a medium-temperature heat exchange medium into the energy storage device 100. The phase change material absorbs heat upon contact with the medium-temperature heat exchange medium, changing from a solid to a liquid. When the phase change material no longer absorbs heat, the second valve port of valve 400 is closed. At this time, a certain amount of heat will be stored in the energy storage device 100. When the battery 300 requires high-power heating during fast charging or other operating conditions of the new energy vehicle, the energy storage device 100 is connected to the liquid cooling plate of the battery 300. The cooler liquid in the liquid cooling plate enters the heat exchange tube 30 of the energy storage device 100 and exchanges heat with the phase change material in the flow channel. The liquid absorbs the heat from the phase change material, and the heated liquid flows back into the liquid cooling plate to heat the battery 300. At the same time, the third valve port of valve 400 is opened, and the medium-temperature heat exchange medium in the thermal management system 200 directly enters the liquid cooling plate through the second pipeline to heat the battery 300 at the same time as the energy storage device 100, so as to improve the heating effect of the battery 300.

[0064] Furthermore, in an embodiment of the present invention, the new energy vehicle also includes an electronic water pump 500, which is disposed on the first pipeline and is used to pump the heat exchange medium in the thermal management system 200 to the energy storage device 100.

[0065] The new energy vehicle provided in this invention, by setting up a thermal management system, a three-way valve and an energy storage device, can connect the thermal management system and the energy storage device before the battery is fast-charged or heated, and first store a certain amount of cold or heat in the energy storage device. When the battery is fast-charged or heated, the thermal management system and the energy storage device simultaneously cool or heat the battery, improving the cooling or heating effect of the battery, so that there is no need to increase the power of the battery cooling device. At the same time, it lays the foundation for further improving the fast charging speed of the battery.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy storage device, characterized in that, include: A cylindrical body, wherein multiple fins are provided inside the cylindrical body, the multiple fins are stacked sequentially along the length direction of the cylindrical body, each fin is provided with at least one first through hole and at least one second through hole, the multiple first through holes on the multiple fins located on the same straight line form a flow channel, the flow channel is used to inject phase change material; At least one heat exchange tube is provided, which is inserted into a plurality of second through holes located on the same straight line on a plurality of fins. The heat exchange tube is used to inject at least one heat exchange medium, wherein a portion of the heat exchange tube is used to introduce coolant and a portion of the heat exchange tube is used to introduce refrigerant. The phase change material and the heat exchange medium exchange heat through the fins, so that the cylinder contains cold or heat.

2. The energy storage device according to claim 1, characterized in that, The cylindrical body includes: A baffle, wherein at least one end of the heat exchange tube passes through the baffle and extends beyond the baffle; An inner cylinder is fitted outside the heat exchange tube, and a baffle is disposed inside the inner cylinder to enclose the phase change material inside the inner cylinder.

3. The energy storage device according to claim 2, characterized in that, The cylindrical body also includes: An end cap is disposed inside the inner cylinder and located on one side of the baffle. The end cap is connected to the baffle and has at least one pipe joint, which is connected to the heat exchange tube.

4. The energy storage device according to claim 2, characterized in that, The cylindrical body also includes: The outer cylinder is fitted over the outer part of the inner cylinder; An edge sealing ring is used to seal the gap between the outer cylinder and the inner cylinder, so that a vacuum insulation layer is formed in the space between the outer cylinder and the inner cylinder.

5. The energy storage device according to claim 4, characterized in that, The sealing ring has an annular groove, and the outer cylinder and the inner cylinder are embedded in the annular groove.

6. The energy storage device according to claim 4, characterized in that, The outer surface of the outer cylinder is coated with a heat-insulating coating.

7. The energy storage device according to claim 4, characterized in that, It also includes an isolation ring, which is disposed between the outer cylinder and the inner cylinder.

8. A new energy vehicle, characterized in that, The device includes a battery, a liquid cooling plate, and an energy storage device according to any one of claims 1-7, wherein the liquid cooling plate is disposed inside the battery and connected to the energy storage device.

9. The new energy vehicle according to claim 8, characterized in that, Also includes: A thermal management system is connected to the energy storage device via a first pipeline; A valve is installed on the first pipeline.

10. The new energy vehicle according to claim 9, characterized in that, The valve is a three-way valve. The first port of the three-way valve is connected to the thermal management system, the second port of the three-way valve is connected to the energy storage device, and the third port of the three-way valve is connected to the liquid cooling plate through a second pipeline.

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