Energy storage device

Abstract

The utility model provides an energy storage equipment, including shell, energy storage current transformer and heat exchange subassembly, the shell forms the installation cavity, the installation cavity is used for holding heat exchange liquid, energy storage current transformer is installed in the installation cavity, energy storage current transformer has facing the heat conduction surface of installation cavity bottom wall setting, heat exchange subassembly heat conduction connection is conducted to the heat conduction surface, heat exchange subassembly is equipped with the heat exchange liquid. The heat exchange assembly is arranged in the mounting cavity, at least part of the heat exchange assembly is used for being immersed in heat exchange liquid, a plurality of heat exchange runners are formed in the heat exchange assembly, and each heat exchange runner communicates with the mounting cavity and is used for allowing the heat exchange liquid to flow through, so that the space in the energy storage equipment and the heat exchange liquid are fully utilized under the condition that laying of a liquid cooling pipeline and workload of a liquid cooling machine are not additionally increased; effective heat dissipation or temperature rise of the energy storage converter is realized. This helps to reduce the complexity and cost of the energy storage device while improving the overall energy efficiency of the energy storage device.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, in particular to energy storage equipment. Background Art

[0002] In energy storage devices that use full immersion heat dissipation, additional liquid cooling pipes are usually required to use liquid cooling plates to cool the energy storage inverter. This will increase the workload of the liquid cooling unit of the energy storage device. When the existing liquid cooling unit cannot simultaneously meet the cooling or heating requirements of the battery components and the energy storage inverter, it may even be necessary to equip the energy storage inverter with an additional liquid cooling unit, which will increase the cost of the energy storage device. Utility Model Content

[0003] The embodiment of the present utility model provides an energy storage device, which can realize cooling or heating of the energy storage converter without adding extra liquid cooling pipeline laying and workload of the liquid cooling unit, and saves costs.

[0004] In a first aspect, an embodiment of the present invention provides an energy storage device.

[0005] In one embodiment, the housing is formed with a mounting cavity, and the mounting cavity is used to contain the heat exchange fluid;

[0006] An energy storage converter is installed in the installation cavity, and the energy storage converter has a heat conducting surface arranged toward the bottom wall of the installation cavity;

[0007] A heat exchange component is heat-conductingly connected to the heat-conducting surface and is at least partially immersed in the heat exchange fluid. The heat exchange component is formed with a plurality of heat exchange channels, each of which is connected to the installation cavity for the heat exchange fluid to flow through.

[0008] In one embodiment, the heat exchange component includes a plurality of heat dissipating fins, which are thermally connected to the heat conducting surface. The plurality of heat dissipating fins are arranged at intervals, and the space between two adjacent heat dissipating fins forms the heat exchange channel.

[0009] In one embodiment, the plurality of heat dissipation fins are arranged at equal intervals.

[0010] In one embodiment, the distance between two adjacent heat dissipation fins is L, wherein 3 mm ≤ L ≤ 10 mm.

[0011] In one embodiment, a plurality of the heat dissipation fins are arranged at intervals along the width direction of the energy storage converter, and each of the heat dissipation fins is extended along the length direction of the energy storage converter.

[0012] In one embodiment, a plurality of the heat dissipation fins are arranged at intervals along the length direction of the energy storage converter, and each of the heat dissipation fins is extended along the width direction of the energy storage converter.

[0013] In one embodiment, each of the heat dissipating fins has a first end portion disposed toward a peripheral side of the housing, and the first end portion is provided with a rounded chamfer.

[0014] In one embodiment, the heat exchange assembly further includes a heat conducting plate, which is mounted on the heat conducting surface and connected to the plurality of heat dissipating fins.

[0015] In one embodiment, the heat conducting plate has a first surface arranged toward the heat dissipating fins, the first surface having an installation area in the middle and a fixing area at the edge, a plurality of the heat dissipating fins are arranged in the installation area, and a width of the fixing area from the installation area to the fixing area is K, wherein 25mm≤K≤35mm.

[0016] In one embodiment, the heat conducting plate is detachably connected to the energy storage converter.

[0017] Beneficial effects of the embodiments of the present utility model:

[0018] In an embodiment of the present invention, the heat or cold generated by the energy storage converter is directly transferred to the heat exchange component through its heat conduction surface. The heat exchange component is at least partially immersed in the heat exchange fluid, so that the heat or cold can be quickly absorbed and carried away by the heat exchange fluid, thereby improving the cooling efficiency or heating efficiency of the energy storage converter. The heat exchange component forms a plurality of heat exchange channels, each of which is connected to the installation cavity, so that the heat exchange fluid can fully flow through each heat exchange channel, further improving the cooling effect or heating effect, so that the operating temperature of the energy storage converter can be effectively controlled, avoiding performance degradation or equipment damage caused by excessively high or low temperatures. In addition, because the energy storage device fully utilizes the space and heat exchange fluid inside the energy storage device without adding additional liquid cooling pipeline laying and liquid cooling machine workload, it achieves effective heat dissipation or heating of the energy storage converter. This helps to reduce the complexity and cost of the energy storage device while improving the overall energy efficiency of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a structural diagram of the energy storage device provided by an embodiment of the present utility model;

[0021] Figure 2 yes Figure 1 The schematic diagram of the structure of the energy storage converter and heat exchange component shown;

[0022] Figure 3 yes Figure 2 A local enlarged schematic diagram shown in FIG;

[0023] Figure 4 This is a structural diagram of a heat exchange assembly provided by one embodiment of the present utility model;

[0024] Figure 5 yes Figure 4 A partial enlarged schematic diagram of point B is shown in FIG;

[0025] Figure 6 This is a structural diagram of a heat exchange assembly provided by another embodiment of the present invention;

[0026] Figure 7 yes Figure 6 A front view of the heat exchange assembly shown;

[0027] Figure 8 yes Figure 6 a bottom view of the heat exchange assembly shown;

[0028] Figure 9 yes Figure 8 The schematic diagram of the local enlargement of point C is shown.

[0029] Description of reference numerals:

[0030] 10. Energy storage equipment;

[0031] 1. housing, 11. mounting cavity;

[0032] 2. Energy storage converter;

[0033] 3. Heat exchange assembly, 31. Heat exchange channel, 32. Heat dissipation fin, 321. First end, 33. Heat conduction plate, 331. First surface, 3311. Mounting area, 3312. Fixing area;

[0034] Battery pack 4. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0036] In energy storage devices that use full immersion heat dissipation, additional liquid cooling pipes are usually required to use liquid cooling plates to cool the energy storage inverter. This will increase the workload of the liquid cooling unit of the energy storage device. When the existing liquid cooling unit cannot simultaneously meet the cooling or heating requirements of the battery components and the energy storage inverter, it may even be necessary to equip the energy storage inverter with an additional liquid cooling unit, which will increase the cost of the energy storage device.

[0037] In view of this, the present invention proposes an energy storage device. Figures 1 to 9 This is a schematic diagram of an embodiment of the energy storage device provided by the present invention. This energy storage device achieves cost-effective cooling or heating of the energy storage converter without requiring additional liquid cooling piping or the workload of the liquid cooling unit. The battery pack is described in detail below in conjunction with the main figures.

[0038] Reference Figures 1 to 3 The energy storage device 10 includes a shell 1, an energy storage converter 2 and a heat exchange component 3. The shell 1 is formed with an installation cavity 11, which is used to hold a heat exchange fluid. The energy storage converter 2 is installed in the installation cavity 11. The energy storage converter 2 has a heat conduction surface arranged toward the bottom wall of the installation cavity 11. The heat exchange component 3 is thermally connected to the heat conduction surface and is at least partially immersed in the heat exchange fluid. The heat exchange component 3 is formed with a plurality of heat exchange channels 31. Each heat exchange channel 31 is connected to the installation cavity 11 for allowing the heat exchange fluid to flow through.

[0039] In an embodiment of the present invention, the heat or cold generated by the energy storage converter 2 is directly transferred to the heat exchange component 3 through its heat conduction surface. The heat exchange component 3 is at least partially immersed in the heat exchange fluid, so that the heat or cold can be quickly absorbed and carried away by the heat exchange fluid, thereby improving the cooling efficiency or heating efficiency of the energy storage converter 2. The heat exchange component 3 forms multiple heat exchange channels 31, each of which is connected to the installation cavity 11, so that the heat exchange fluid can fully flow through each heat exchange channel 31, further improving the cooling effect or heating effect, so that the operating temperature of the energy storage converter 2 can be effectively controlled, avoiding performance degradation or equipment damage caused by excessively high or low temperatures. In addition, because the energy storage device 10 fully utilizes the space and heat exchange fluid inside the energy storage device 10 without additional liquid cooling pipeline laying and liquid cooling machine power, it achieves effective heat dissipation or heating of the energy storage converter 2. This helps to reduce the complexity and cost of the energy storage device 10 while improving the overall energy efficiency of the energy storage device 10.

[0040] It should be noted that the housing 1 is provided with a liquid inlet and a liquid outlet, and the energy storage device 10 further includes a battery assembly 4 and a liquid cooling unit. The battery assembly 4 is installed in the housing 1 and immersed in the heat exchange liquid, and the liquid cooling unit is connected to the liquid inlet and the liquid outlet. Taking the cooling of the energy storage converter 2 and the battery assembly 4 as an example, the liquid cooling unit cools down the heat exchange liquid with a raised temperature flowing out of the installation cavity 11, and then inputs the heat exchange liquid with a lowered temperature into the installation cavity 11. In this way, the heat exchange liquid in the installation cavity 11 is in a circulating flow state, so that the flowing heat exchange liquid can flow into multiple heat exchange channels 31. The heat exchange liquid flowing in the heat exchange channels 31 can efficiently take away the heat generated by the energy storage converter 2, significantly reducing its operating temperature. This helps to improve the operating efficiency and stability of the energy storage device 10 and extend the service life of the device. Furthermore, without requiring additional liquid cooling piping or increasing the power of the liquid cooling unit, the liquid cooling unit within the energy storage device 10 is fully utilized to cool the battery assembly 4, effectively dissipating heat or heating the energy storage converter 2. This helps reduce the complexity and cost of the energy storage device 10 while improving overall energy efficiency.

[0041] In addition, since the technology of cooling battery components through liquid cooling units is mature, this application will not go into details.

[0042] There are various ways to form the multiple heat exchange channels 31 within the heat exchange assembly 3. For example, in one embodiment, the heat exchange assembly 3 may include a heat exchange plate connected to a heat conducting surface. The heat exchange plate is provided with multiple heat exchange channels 31 extending along its length or width. This design increases the heat exchange area, thereby improving overall heat exchange efficiency. Furthermore, the heat exchange channels 31 extending along its length or width effectively form multiple structural support points within the heat exchange plate. These support points, similar to a skeleton structure, effectively enhance the overall rigidity of the heat exchange plate, making it less susceptible to deformation.

[0043] Reference Figures 2 to 5 In an embodiment of the present application, the heat exchange component 3 includes a plurality of heat sink fins 32, which are thermally connected to the heat conducting surface. The plurality of heat sink fins 32 are arranged at intervals, and the space between two adjacent heat sink fins 32 forms a heat exchange flow channel 31. In this way, the design of the heat sink fins 32 greatly increases the heat transfer area of ​​the heat exchange component 3. Since the number of heat sink fins 32 is large and they are closely arranged, the contact area between the heat exchange fluid and the heat sink fins 32 is significantly increased, thereby improving the heat transfer efficiency. The space between two adjacent heat sink fins 32 forms a heat exchange flow channel 31. These heat exchange flow channels 31 provide a smooth channel for the heat exchange fluid, allowing the heat exchange fluid to fully exchange heat with the heat sink fins 32. The presence of the heat sink fins 32 promotes convective heat transfer of the heat exchange fluid in the flow channel. When the heat exchange fluid flows through the heat sink fins 32, it will be disturbed by the heat sink fins 32, causing the boundary layer to continuously break up, thereby increasing the convective heat transfer coefficient and further improving the heat transfer efficiency. The heat dissipation fins 32 disperse the heat on the heat transfer surface to multiple points, reducing the concentration of thermal stress in a single area and improving the structural strength and stability of the heat exchange component 3. In a high temperature environment, the heat exchange component 3 is prone to thermal deformation. The design of the heat dissipation fins 32 helps to disperse heat and reduce the risk of thermal deformation caused by local excessive temperatures. The spacing between the heat dissipation fins 32 provides convenience for cleaning. When the heat exchange fluid contains impurities or dirt, the dirt on the fins can be removed by appropriate cleaning methods to keep the heat exchange component 3 clean and efficient. Since the design of the heat dissipation fins 32 is relatively simple and easy to maintain, the maintenance cost of the heat exchange component 3 can be reduced.

[0044] It should be noted that the heat dissipating fins 32 are made of a thermally conductive material. Specifically, the heat dissipating fins 32 may be made of copper, aluminum, stainless steel, steel-aluminum alloy, or copper-aluminum alloy, etc. Specifically, this application does not limit this.

[0045] Reference Figure 3 and Figure 5In one embodiment, the multiple heat sinks 32 are arranged at equal intervals. This evenly spaced arrangement of the heat sinks 32 evenly distributes heat across the heat transfer surface, preventing excessive heat concentration in certain areas and thereby improving overall heat exchange efficiency. The evenly spaced arrangement of the heat sinks 32 helps reduce thermal resistance, as each heat sink 32 effectively exchanges heat with the heat exchange fluid, eliminating heat exchange blind spots caused by uneven spacing. The evenly spaced spacing of the heat sinks 32 provides a uniform flow path for the heat exchange fluid, enhancing convective heat transfer within the heat exchange channel 31. This uniform flow helps reduce the thickness of the boundary layer and improve the convective heat transfer coefficient. The evenly spaced arrangement of the heat sinks 32 evenly distributes stress across the heat exchange assembly 3, preventing structural damage caused by stress concentration. This helps improve the overall structural stability of the heat exchange assembly 3. In high-temperature environments, the heat exchange assembly 3 is prone to thermal deformation. The evenly spaced heat sink fins 32 design helps distribute heat, reducing the risk of thermal deformation caused by localized overheating, thereby maintaining the shape and dimensional stability of the heat exchange assembly 3. The evenly spaced fins 32 layout simplifies the manufacturing process because precise adjustment of the position of each fin 32 is not required; they can simply be arranged at a uniform spacing. This helps reduce production costs and improve production efficiency. The evenly spaced fins 32 facilitate cleaning and maintenance. Because the spacing between the fins is uniform, the fins 32 can be cleaned and maintained using standardized cleaning tools and methods, reducing the difficulty and cost of cleaning and maintenance.

[0046] In one embodiment, the distance between two adjacent heat sinks 32 is L, where 3mm≤L≤10mm. In this way, too small a spacing may increase the flow resistance and increase the power consumption of the liquid cooling unit, while too large a spacing may reduce the heat exchange area and reduce the heat exchange amount. The spacing range of 3mm to 10mm helps to find a balance between flow resistance and heat exchange area, so that the heat exchange liquid can flow smoothly and fully exchange heat with the heat sink fins 32. Appropriate spacing between the heat sink fins 32 helps to evenly distribute thermal stress to the entire heat exchange component 3, avoiding structural damage caused by local stress concentration. This helps to improve the structural stability and service life of the heat exchange component 3. In a high temperature environment, the heat exchange component 3 is prone to thermal deformation. Appropriate spacing between the heat sink fins 32 can reduce the risk of thermal deformation caused by excessively high local temperatures and maintain the shape and dimensional stability of the heat exchange component 3.

[0047] It should be noted that the distance between two adjacent heat dissipation fins 32 can be 3 mm, 3.1 mm, 3.2 mm, 3.5 mm, 3.7 mm, 3.8 mm, 4.1 mm, 4.3 mm, 4.6 mm, 4.9 mm, 5.1 mm, 5.4 mm, 5.8 mm, 5.9 mm, 6.1 mm, 6.4 mm, 6.7 mm, 6.9 mm, 7.2 mm, 7.4 mm, 7.7 mm, 8.2 mm, 8.5 mm, 8.8 mm, 8.9 mm, 9 mm, 9.1 mm, 9.3 mm, 9.5 mm, 9.7 mm, 9.9 mm or 10 mm, etc. The distance between two adjacent heat dissipation fins 32 can be selected as needed and is not limited in this application.

[0048] Reference Figures 2 to 4 In one embodiment, a plurality of heat sink fins 32 are spaced apart along the width direction of the energy storage inverter 2, and each heat sink fin 32 extends along the length direction of the energy storage inverter 2. Thus, the heat sink fins 32 extending along the length direction of the energy storage inverter 2 can significantly increase the length of the heat exchange channel 31, allowing the heat exchange fluid to exchange heat with the heat sink fins 32 for a longer period of time when flowing through the longer heat exchange channel 31, thereby improving the heat exchange efficiency. The heat sink fins 32 extending along the length direction of the energy storage inverter 2 help guide the heat exchange fluid to flow along the heat sink fins 32, forming a more orderly and efficient heat exchange process. This design ensures that the heat exchange fluid can fully exchange heat with the heat sink fins 32 when passing through the heat sink fins 32, removing more heat.

[0049] It should be noted that, in other embodiments, each heat dissipating fin 32 may also be at least partially curved, and this application does not limit this.

[0050] Reference Figures 6 to 8 In another embodiment, multiple heat sink fins 32 are spaced apart along the length of the energy storage inverter 2 , and each heat sink fin 32 extends along the width of the energy storage inverter 2 . This allows for the formation of more heat exchange channels 31 along the length of the energy storage inverter 2 . More heat exchange channels 31 mean that the heat exchange fluid, as it flows through these channels, can come into contact with and exchange heat with more surfaces of the heat sink fins 32 , thereby improving heat dissipation efficiency. The increased number of heat exchange channels 31 allows heat to be more evenly distributed throughout the channels 31 , preventing localized overheating and resulting in a more uniform temperature distribution throughout the energy storage inverter 2 .

[0051] Reference Figure 9In one embodiment, each heat sink fin 32 has a first end 321 positioned toward the periphery of the housing 1. This first end 321 is rounded and chamfered. This rounded chamfer helps guide the heat exchange fluid into the heat exchange channel 31 more smoothly, reducing turbulence and eddy currents that occur when the heat exchange fluid enters the heat exchange channel 31. This allows the heat exchange fluid to be more evenly distributed throughout the heat exchange channel 31, further improving heat exchange efficiency. The rounded chamfer design helps disperse stress concentration at the first end 321 of the heat sink fin 32 when subjected to external forces, thereby improving the heat sink fin 32's resistance to deformation and fracture.

[0052] Reference Figure 4 and Figure 6 In one embodiment, the heat exchange assembly 3 further includes a heat conducting plate 33 mounted on the heat conducting surface and connected to the plurality of heat dissipating fins 32. Thus, the heat conducting plate 33 acts as a heat transfer medium, rapidly and evenly transferring heat generated by the energy storage converter 2 to the heat dissipating fins 32. This design optimizes the heat transfer path, reduces heat loss during the transfer process, and improves heat conduction efficiency. The presence of the heat conducting plate 33 helps disperse thermal stress generated by the energy storage converter 2, preventing structural damage caused by localized overheating. Furthermore, the close connection between the heat conducting plate 33 and the heat dissipating fins 32 enhances the structural stability of the entire heat exchange assembly 3. The heat conducting plate 33 evenly distributes heat to each heat dissipating fin 32, preventing excessive heat concentration on certain fins. This uniform heat distribution helps improve the heat dissipation efficiency of the entire heat exchange assembly 3, ensuring that the energy storage converter 2 maintains a stable temperature during operation. The connection between the heat conducting plate 33 and the heat dissipating fins 32 simplifies and expedites the installation of the heat exchange assembly 3.

[0053] In one embodiment, the heat conducting plate 33 has a first surface 331 arranged toward the heat dissipating fins 32. The first surface 331 has a mounting area 3311 in the middle and a fixing area 3312 at the edge. The mounting area 3311 is provided with a plurality of heat dissipating fins 32. From the mounting area 3311 to the fixing area 3312, the width of the fixing area 3312 is K, where 25 mm ≤ K ≤ 35 mm. Thus, the width of the fixing area 3312 is set within a range of 25 mm to 35 mm. This ensures that the heat conducting plate 33 will not be difficult to fix during installation due to the fixing area 3312 being too narrow, nor will the area of ​​the mounting area 3311 be reduced due to the fixing area 3312 being too wide. This ensures that the number of heat dissipating fins 32 is as large as possible, thereby improving the heat dissipation efficiency of the energy storage converter 2.

[0054] It should be noted that the width of the fixed area is 25 mm, 25.5 mm, 26 mm, 26.3 mm, 26.5 mm, 26.8 mm, 27.1 mm, 27.5 mm, 27.9 mm, 28 mm, 28.4 mm, 28.8 mm, 29 mm, 29.3 mm, 29.8 mm, 30 mm, 30.5 mm, 31 mm, 31.6 mm, 31.9 mm, 32.3 mm, 32.8 mm, 33 mm, 33.5 mm, 33.9 mm, 34.5 mm, 34.9 mm, or 35 mm. The width of the fixed area can be selected as needed and is not limited in this application.

[0055] In one embodiment, the heat conducting plate 33 is detachably connected to the energy storage converter 2. Thus, when the heat conducting plate 33 needs to be replaced due to long-term use or specific reasons (such as damage or performance degradation), the detachable connection design makes the replacement process simple and quick, without the need to disassemble or make large-scale adjustments to the entire energy storage converter 2. The heat conducting plate 33 may accumulate dust, dirt, etc. during use, affecting the heat conduction effect. The detachable connection allows the heat conducting plate 33 to be easily removed for thorough cleaning, thereby maintaining its good thermal conductivity. Since the heat conducting plate 33 can be replaced separately, there is no need to replace the entire energy storage converter 2 at the same time, thereby saving material costs and resources.

[0056] It should be noted that there are multiple ways to achieve detachable connection between the heat conducting plate 33 and the energy storage converter 2. For example, in one embodiment, the heat conducting plate 33 and the energy storage converter 2 can be connected by bolts. In this way, the structure is simple, disassembly and assembly are convenient, and the cost is low. In another embodiment, for example, the heat conducting plate 33 and the energy storage converter 2 can be connected by snap fasteners. In this way, disassembly and assembly are quick and easy to operate. Specifically, in other embodiments, the specific method of detachable connection between the heat conducting plate 33 and the energy storage converter 2 can be selected as needed, and this application does not limit this.

[0057] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, based on the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. An energy storage device, characterized in that: include: The housing is formed with a mounting cavity, wherein the mounting cavity is used to contain a heat exchange fluid; An energy storage converter is installed in the installation cavity, and the energy storage converter has a heat conducting surface arranged toward the bottom wall of the installation cavity; A heat exchange component is heat-conductingly connected to the heat-conducting surface and is at least partially immersed in the heat exchange fluid. The heat exchange component is formed with a plurality of heat exchange channels, each of which is connected to the installation cavity for the heat exchange fluid to flow through.

2. The energy storage device according to claim 1, characterized in that The heat exchange component includes a plurality of heat dissipation fins, which are thermally connected to the heat conduction surface. The heat dissipation fins are arranged at intervals, and the space between two adjacent heat dissipation fins forms the heat exchange flow channel.

3. The energy storage device according to claim 2, characterized in that The plurality of heat dissipation fins are arranged at equal intervals.

4. The energy storage device according to claim 2, characterized in that The distance between two adjacent heat dissipation fins is L, wherein 3mm≤L≤10mm.

5. The energy storage device according to claim 2, characterized in that The plurality of heat dissipation fins are arranged at intervals along the width direction of the energy storage converter, and each of the heat dissipation fins is extended along the length direction of the energy storage converter.

6. The energy storage device according to claim 2, characterized in that The plurality of heat dissipation fins are arranged at intervals along the length direction of the energy storage converter, and each of the heat dissipation fins is extended along the width direction of the energy storage converter.

7. The energy storage device according to any one of claims 2 to 6, characterized in that: Each of the heat dissipation fins has a first end portion disposed toward the peripheral side of the housing, and the first end portion is provided with a round chamfer.

8. The energy storage device according to any one of claims 2 to 6, characterized in that: The heat exchange assembly further includes a heat conducting plate, which is mounted on the heat conducting surface and connected to the plurality of heat dissipating fins.

9. The energy storage device according to claim 8, characterized in that The heat conducting plate has a first surface arranged toward the heat dissipating fins, the first surface having an installation area in the middle and a fixing area at the edge, a plurality of the heat dissipating fins are arranged in the installation area, and a width of the fixing area from the installation area to the fixing area is K, wherein 25mm≤K≤35mm.

10. The energy storage device according to claim 8, characterized in that The heat conducting plate is detachably connected to the energy storage converter.

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