energy storage device

Abstract

The application discloses an energy storage device, comprising a shell, an inverter, a battery cell group and a first heat dissipation module, the shell is provided with two heat dissipation air inlets; the inverter is arranged in the shell; the battery cell group is arranged in the shell; the first heat dissipation module is arranged between the inverter and the battery cell group and is in thermal coupling with the inverter and the battery cell group, a heat dissipation air duct is formed on the first heat dissipation module, and the heat dissipation air duct is arranged between the two heat dissipation air inlets and in communication with the two heat dissipation air inlets. The energy storage device provided by the application realizes the concentrated heat dissipation of the inverter and the battery cell group by arranging the first heat dissipation module between the inverter and the battery cell group and arranging the heat dissipation air duct in communication with the two heat dissipation air inlets, simplifies the heat dissipation air duct, shortens the heat dissipation path, realizes the high integration of the heat dissipation air duct, and is beneficial to the lightweight development of the energy storage device.

Description

Technical Field

[0001] This application relates to the field of portable energy storage technology, and more specifically, to an energy storage device. Background Technology

[0002] In energy storage devices, the power devices and battery cells mounted on the inverter generate significant heat during operation. If this heat is not dissipated effectively and promptly, it can lead to overheating failure, reduced efficiency, or shortened lifespan. Related technologies often employ aluminum extrusion heat sinks combined with thermal grease and side-blowing fans for heat dissipation. However, because the power devices and battery cells on the inverter are distributed widely, centralized heat dissipation is difficult. This results in long heat dissipation paths, low heat transfer efficiency, complex cooling ducts, and large volume, hindering the high integration of cooling ducts and limiting the lightweight development of energy storage devices. Utility Model Content

[0003] This application provides an energy storage device to solve at least one of the above-mentioned technical problems.

[0004] The energy storage device according to the embodiments of this application includes: The housing has two heat dissipation vents. An inverter, wherein the inverter is disposed within the housing; A battery cell assembly, wherein the battery cell assembly is disposed within the housing; A first heat dissipation module is disposed between the inverter and the battery cell assembly and is thermally coupled to both the inverter and the battery cell assembly. A heat dissipation duct is formed on the first heat dissipation module and is disposed between and connected to the two heat dissipation vents.

[0005] The energy storage device provided in this application achieves centralized heat dissipation for both the inverter and the battery cell assembly by placing the first heat dissipation module between the inverter and the battery cell assembly and connecting the heat dissipation duct to two heat dissipation vents. This simplifies the heat dissipation duct, shortens the heat dissipation path, and achieves a high degree of integration of the heat dissipation duct, which is conducive to the lightweight development of energy storage devices. In addition, the first heat dissipation module isolates the inverter from the battery cell assembly, which helps prevent the high temperature generated by the inverter from being conducted to the battery cell assembly, ensuring that the battery cell assembly is in a lower safe temperature range and helping to avoid thermal runaway of the battery cell assembly.

[0006] In some embodiments, the housing includes a peripheral sidewall, a first shell, and a second shell. The peripheral sidewall is rectangular cylindrical, and the first shell and the second shell are respectively disposed at the openings at both ends of the peripheral sidewall. The two heat dissipation vents are respectively disposed on the first shell and the second shell.

[0007] In this way, by setting the heat dissipation vents on the first and second shells respectively, the heat dissipation air duct is efficiently connected at both ends of the shell, which is conducive to forming a straight heat dissipation path, reducing wind resistance and improving heat dissipation efficiency. At the same time, the peripheral sidewalls form a three-dimensional sealed structure with the first and second shells, which has strong dustproof and waterproof capabilities and is conducive to meeting the needs of outdoor use.

[0008] In some embodiments, the first heat dissipation module includes a first heat dissipation plate, a second heat dissipation plate, and a plurality of first heat dissipation fins. The first heat dissipation fins are connected to the first heat dissipation plate and the second heat dissipation plate on both sides, respectively. The plurality of first heat dissipation fins extend in the same direction and are spaced apart. Two adjacent first heat dissipation fins, together with the first heat dissipation plate and the second heat dissipation plate, form a heat dissipation air duct.

[0009] In this way, by using a first heat sink, a second heat sink, and spaced-apart first heat sink fins to enclose and form a heat dissipation channel, a high degree of integration and uniform distribution of the heat dissipation channel is achieved, which is conducive to increasing the heat dissipation area and improving the heat exchange efficiency.

[0010] In some embodiments, the inverter is provided with multiple power devices, and the first heat sink is provided with multiple heat dissipation protrusions on the side of the inverter, and the multiple heat dissipation protrusions are thermally coupled to the multiple power devices respectively.

[0011] In this way, by setting heat dissipation protrusions corresponding to the power devices on the heat sink, tight thermal coupling between the heat dissipation module and the inverter power devices is achieved, which helps to improve the local heat dissipation intensity and avoid hot spot accumulation.

[0012] In some embodiments, the energy storage device further includes a second heat dissipation module disposed within the housing, the second heat dissipation module being thermally coupled to the first heat dissipation module and the battery cell assembly.

[0013] Thus, by setting up a second heat dissipation module that is thermally coupled to both the first heat dissipation module and the battery cell assembly, auxiliary heat dissipation of the battery cell assembly is achieved, which helps to further reduce the battery cell temperature and improve the system's thermal safety performance.

[0014] In some embodiments, the second heat dissipation module includes a third heat dissipation plate and a plurality of second heat dissipation fins. The third heat dissipation plate is thermally coupled to the first heat dissipation module, and the plurality of second heat dissipation fins are connected to the third heat dissipation plate. The battery cell group includes a plurality of battery cells arranged in parallel, and the plurality of second heat dissipation fins are all disposed between two adjacent battery cells and thermally coupled to the two battery cells.

[0015] In this way, by placing the second heat dissipation fins between adjacent cells and thermally coupling them with the cells, direct heat dissipation of each cell is achieved, which helps to balance the temperature distribution of the cell group and delay cell aging.

[0016] In some embodiments, a heat-conducting part is provided between the first heat dissipation module and the second heat dissipation module.

[0017] Thus, by setting a heat-conducting part between the first heat dissipation module and the second heat dissipation module, efficient heat conduction between the two is achieved, which is conducive to improving the synergy of the overall heat dissipation structure and the efficiency of thermal management.

[0018] In some embodiments, the energy storage device further includes a cooling fan mounted on the housing, the cooling fan being positioned corresponding to the cooling vent.

[0019] In this way, by setting up cooling fans for the corresponding heat dissipation vents, forced air cooling of the heat dissipation duct is achieved, which helps to enhance airflow and improve the overall heat dissipation capacity.

[0020] In some embodiments, the number of cooling fans is two, and the two cooling fans are respectively set to two cooling vents.

[0021] In this way, by setting cooling fans at the two heat dissipation vents respectively, bidirectional reciprocating or coordinated air blowing is achieved, which is conducive to adapting to different heat dissipation conditions and enhancing the flexibility of heat dissipation.

[0022] In some embodiments, the battery pack includes a housing and a plurality of battery cells, the housing being groove-shaped and the plurality of battery cells disposed within the housing.

[0023] In this way, by placing multiple battery cells inside the slotted housing, the battery cell assembly is integrated and fixed, which helps to save space, improve structural stability, and facilitate assembly with the heat dissipation module.

[0024] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the internal structure of the energy storage device according to an embodiment of this application; Figure 2 This is a schematic diagram of the energy storage device according to an embodiment of this application; Figure 3 This is an exploded view of the energy storage device according to an embodiment of this application; Figure 4This is an assembly drawing of a portion of the structure of the energy storage device according to an embodiment of this application; Figure 5 This is an assembly drawing of a portion of the structure of the energy storage device according to an embodiment of this application.

[0026] Explanation of main component symbols: Energy storage device 100, housing 10, heat dissipation vent 11, peripheral sidewall 12, first housing 13, second housing 14, inverter 20, power device 21, circuit board 22, battery cell assembly 30, battery cell 31, housing 32, first heat dissipation module 40, heat dissipation duct 41, first heat dissipation plate 42, heat dissipation boss 421, second heat dissipation plate 43, first heat dissipation fin 44, upper fin 441, lower fin 442, connecting piece 443, second heat dissipation module 50, third heat dissipation plate 51, second heat dissipation fin 52, heat-conducting part 60, cooling fan 70. Detailed Implementation

[0027] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] This disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described herein. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0031] In energy storage devices, the power devices and battery cells 31 mounted on the inverter generate significant heat during operation. If not dissipated effectively and promptly, this can lead to overheating failure, reduced efficiency, or shortened lifespan. Related technologies often employ aluminum extrusion heat sinks combined with thermal grease and side-blowing fans for heat dissipation. However, because the power devices and battery cells 31 on the inverter are dispersed, centralized heat dissipation is difficult. This results in long heat dissipation paths, low heat transfer efficiency, complex cooling ducts, and large volume, hindering the high integration of cooling ducts and limiting the lightweight development of energy storage devices.

[0032] Please see Figure 1 The energy storage device 100 of this application includes a housing 10, an inverter 20, a battery cell assembly 30, and a first heat dissipation module 40. The housing 10 has two heat dissipation vents 11. The inverter 20 is disposed inside the housing 10. The battery cell assembly 30 is disposed inside the housing 10. The first heat dissipation module 40 is disposed between the inverter 20 and the battery cell assembly 30 and is thermally coupled to the inverter 20 and the battery cell assembly 30. A heat dissipation duct 41 is formed on the first heat dissipation module 40. The heat dissipation duct 41 is disposed between the two heat dissipation vents 11 and communicates with the two heat dissipation vents 11.

[0033] The energy storage device 100 provided in this application achieves centralized heat dissipation for the inverter 20 and the battery cell group 30 by placing the first heat dissipation module 40 between the inverter 20 and the battery cell group 30 and connecting the heat dissipation duct 41 with two heat dissipation vents 11. This simplifies the heat dissipation duct 41, shortens the heat dissipation path, and achieves a high degree of integration of the heat dissipation duct 41, which is conducive to the lightweight development of the energy storage device 100. In addition, the first heat dissipation module 40 isolates the inverter 20 from the battery cell group 30, which helps to prevent the high temperature generated by the inverter 20 from being conducted to the battery cell group 30, ensuring that the battery cell group 30 is in a lower safe temperature range, and helping to avoid thermal runaway of the battery cell group 30.

[0034] For details, please refer to Figures 1 to 3 In this embodiment of the application, the inverter 20 is provided with a variety of power devices 21 that generate a lot of heat when operating, including but not limited to MOSFETs, transformers, inductors, etc.

[0035] In this embodiment, the battery cell assembly 30 includes a plurality of battery cells 31, which are stacked side by side along the thickness direction of the battery cells 31.

[0036] In this embodiment, the first heat dissipation module 40 has multiple air ducts running through it along its length. The two ends of the air ducts are directly connected to the heat dissipation vents 11 on both sides of the housing 10, avoiding any bends or necking, and ensuring that the airflow is straight. This can significantly reduce wind resistance and improve heat dissipation efficiency.

[0037] In some embodiments, the first heat dissipation module 40 is typically made of a metal or alloy with good thermal conductivity, such as aluminum, steel, or aluminum alloy. In this embodiment, an aluminum first heat dissipation module 40 is selected. Aluminum is a commonly used material with good thermal conductivity, with a thermal conductivity of approximately 200–240 W / (m·K). The aluminum first heat dissipation module 40 can efficiently absorb and transfer the heat generated by the power devices 21 of the inverter 20 and the battery pack 30 to the entire first heat dissipation module 40, and then exchange heat with the cooling air through the heat dissipation duct 41, thereby effectively reducing the temperature of the heat source. In addition, aluminum has a low density, much lower than other metals. Under the premise of meeting sufficient structural strength and heat dissipation performance, using an aluminum heat dissipation module can significantly reduce the overall weight of the equipment.

[0038] Please see Figures 1 to 3 In some embodiments, the housing 10 includes a peripheral sidewall 12, a first housing 13 and a second housing 14. The peripheral sidewall 12 is in the shape of a rectangular cylinder. The first housing 13 and the second housing 14 are respectively disposed at the openings at both ends of the peripheral sidewall 12. Two heat dissipation vents 11 are respectively disposed on the first housing 13 and the second housing 14.

[0039] Thus, by setting the heat dissipation vents 11 on the first shell 13 and the second shell 14 respectively, the heat dissipation duct 41 is efficiently connected at both ends of the shell 10, which is conducive to forming a straight heat dissipation path, reducing wind resistance and improving heat dissipation efficiency. At the same time, the peripheral sidewall 12 forms a three-dimensional sealed structure with the first shell 13 and the second shell 14, which has strong dustproof and waterproof capabilities and is conducive to meeting the needs of outdoor use.

[0040] Specifically, in the embodiments of this application, the shell 10 adopts a split modular structure, the peripheral sidewall 12 is an integrally formed rectangular frame, the first shell 13 and the second shell 14 are die-cast, and the peripheral sidewall 12 is fastened to the first shell 13 and the second shell 14 by fasteners such as screws.

[0041] Furthermore, to improve the sealing at the connection between the peripheral sidewall 12 and the first shell 13 and the second shell 14, sealant can be applied to the connection between the peripheral sidewall 12 and the first shell 13 and the second shell 14 to encapsulate the first shell 13 and the second shell 14 at both ends of the peripheral sidewall 12.

[0042] In this embodiment, the heat dissipation vents 11 are respectively opened in the middle of the first shell 13 and the second shell 14, and are aligned with and connected to the heat dissipation duct 41.

[0043] In some embodiments, the outer side of the heat dissipation vent 11 may be covered with a removable dustproof grille, and the inner side may be fitted with waterproof foam. In this way, it can effectively resist the intrusion of outdoor wind, rain and dust, while ensuring that the internal air duct can exchange air smoothly with the outside.

[0044] Please see Figure 1 and Figure 4 In some embodiments, the first heat dissipation module 40 includes a first heat dissipation plate 42, a second heat dissipation plate 43 and a plurality of first heat dissipation fins 44. The two sides of the first heat dissipation fins 44 are respectively connected to the first heat dissipation plate 42 and the second heat dissipation plate 43. The plurality of first heat dissipation fins 44 extend in the same direction and are spaced apart. Two adjacent first heat dissipation fins 44, together with the first heat dissipation plate 42 and the second heat dissipation plate 43, form a heat dissipation air duct 41.

[0045] Thus, by using the first heat sink 42, the second heat sink 43 and the spaced first heat sink fins 44 to form a heat dissipation channel 41, the heat dissipation channel 41 is highly integrated and evenly distributed, which is conducive to increasing the heat dissipation area and improving the heat exchange efficiency.

[0046] Specifically, heat dissipation fins are also called heat dissipation plates. During the heat dissipation process, after the first heat dissipation fin 44 absorbs heat, it dissipates the heat through convection. In the process of convection heat dissipation, the heat dissipation area is mainly determined by the size of the surface area of ​​the first heat dissipation fin 44. The larger the surface area, the better the heat dissipation effect; the smaller the surface area, the worse the heat dissipation effect.

[0047] In this embodiment, the first heat sink 42 and the second heat sink 43 are arranged in parallel. The first heat sink 42 is thermally coupled to the inverter 20. The first heat sink fin 44 includes an upper fin 441, a lower fin 442, and a connecting piece 443. The upper fin 441, the lower fin 442, and the connecting piece 443 are all rectangular. The longer side of the upper fin 441 is connected to the first heat sink 42, and the longer side of the lower fin 442 is connected to the second heat sink 43. The two longer side plates of the connecting piece 443 are respectively connected to the first heat sink 42 and the second heat sink 43 to connect the first heat sink module 40 into a whole. The first heat sink fin 44, the first heat sink 42, and the second heat sink 43 are all arranged perpendicular to each other. Multiple upper fins 441 are evenly arranged on the first heat sink 42, and multiple lower fins 442 are evenly arranged on the second heat sink 43. Two adjacent upper fins 441 or two adjacent lower fins 442 are arranged in parallel, and the distance between any two adjacent first heat sink fins 44 is equal.

[0048] In some embodiments, a guide section can be provided on the same side of the plurality of first heat dissipation fins 44. The design of the guide section can guide airflow, allowing hot air to be discharged more smoothly, while simultaneously drawing more cool air into the heat dissipation area, forming an effective convection circulation. In this way, the first heat dissipation fins 44 can dissipate heat more efficiently, ensuring that the temperature of the equipment is effectively controlled. Specifically, the first heat dissipation fins 44 can be bent, with the bending angle and bending position of the plurality of first heat dissipation fins 44 being the same. The bent first heat dissipation fins 44 are evenly arranged between the first heat dissipation plate 42 and the second heat dissipation plate 43, with adjacent first heat dissipation fins 44 arranged in parallel, and the distance between any two adjacent first heat dissipation fins 44 is equal.

[0049] In this embodiment, the first heat dissipation fin 44, the first heat dissipation plate 42, and the second heat dissipation plate 43 are integrally formed. To facilitate the demolding of the first heat dissipation module 40, a transition rounded corner is provided at the connection between the first heat dissipation fin 44 and the first heat dissipation plate 42 and the second heat dissipation plate 43. At the same time, the distance between two adjacent first heat dissipation fins 44 should not be too close.

[0050] In some embodiments, the first heat dissipation module 40 may also be configured as a split structure with separate processing. For example, the first heat dissipation plate 42 and the second heat dissipation plate 43 are both aluminum stamping parts, which are connected to a plurality of first heat dissipation fins 44 by welding.

[0051] In some embodiments, if a higher heat dissipation density is required, the first heat dissipation fin 44 can be replaced with an aluminum fin with an embedded heat pipe. The heat pipe is welded to the two heat dissipation plates to form a heat spreader effect, thereby achieving rapid diffusion of hot spots in the high-power inverter 20.

[0052] Please see Figure 1 and Figure 4 In some embodiments, the inverter 20 is provided with multiple power devices 21, and the first heat sink 42 is provided with multiple heat dissipation protrusions 421 on the side near the inverter 20. The multiple heat dissipation protrusions 421 are thermally coupled to the multiple power devices 21 respectively.

[0053] Thus, by setting heat dissipation protrusions 421 corresponding to power device 21 on the heat sink, tight thermal coupling between the heat dissipation module and the power device 21 of inverter 20 is achieved, which is beneficial to improve local heat dissipation intensity and avoid hot spot accumulation.

[0054] Specifically, in this embodiment, the inverter 20 includes a circuit board 22 and a plurality of power devices 21. The plurality of power devices 21 are arranged on the surface of the circuit board 22 away from the first heat dissipation module 40. The circuit board 22 is attached to the first heat dissipation plate 42 and forms thermal coupling.

[0055] Furthermore, multiple heat dissipation protrusions 421 protruding towards the inverter 20 are machined on the side of the first heat dissipation plate 42 facing the inverter 20, and each protrusion corresponds one-to-one with the power device 21 and forms thermal coupling.

[0056] In some embodiments, the top of the heat dissipation boss 421 is milled with microgrooves, which can be filled with thermally conductive silicone grease to ensure that there is no air gap between the device and the boss; the corners of the heat dissipation boss 421 can be provided with annular chamfers to prevent the heat dissipation boss 421 from getting caught on the circuit board 22 of the inverter 20 during installation.

[0057] In some embodiments, the heat dissipation boss 421 and the first heat dissipation plate 42 are milled from the same aluminum material.

[0058] In some embodiments, the heat dissipation boss 421 and the first heat dissipation plate 42 can also be an integral structure formed by hot pressing, injection molding and other processes.

[0059] Please see Figure 1 , Figure 3 and Figure 5 In some embodiments, the energy storage device 100 further includes a second heat dissipation module 50 disposed within the housing 10, the second heat dissipation module 50 being thermally coupled to the first heat dissipation module 40 and the battery cell assembly 30.

[0060] Thus, by setting up a second heat dissipation module 50 that is thermally coupled to both the first heat dissipation module 40 and the battery cell assembly 30, auxiliary heat dissipation of the battery cell assembly 30 is achieved, which helps to further reduce the temperature of the battery cell 31 and improve the thermal safety performance of the system.

[0061] In some embodiments, the second heat dissipation module 50 includes a third heat dissipation plate 51 and a plurality of second heat dissipation fins 52. The third heat dissipation plate 51 is thermally coupled to the first heat dissipation module 40, and the plurality of second heat dissipation fins 52 are connected to the third heat dissipation plate 51. The battery cell group 30 includes a plurality of battery cells 31 arranged in parallel, and the plurality of second heat dissipation fins 52 are all disposed between two adjacent battery cells 31 and thermally coupled to the two battery cells 31.

[0062] Thus, by placing the second heat dissipation fins 52 between adjacent cells 31 and thermally coupling them with the cells 31, direct heat dissipation of each cell 31 is achieved, which is beneficial to balancing the temperature distribution of the cell group 30 and delaying the aging of the cells 31.

[0063] Specifically, in this embodiment, the second heat dissipation fin 52 is rectangular in shape, and the longer side of the second heat dissipation fin 52 is connected to the third heat dissipation plate 51. The third heat dissipation plate 51 is arranged parallel to the second heat dissipation plate 43, and the second heat dissipation fin 52 is arranged perpendicular to the third heat dissipation plate 51. Multiple second heat dissipation fins 52 are evenly arranged on the third heat dissipation plate 51. Two adjacent second heat dissipation fins 52 are arranged parallel to each other, and the distance between any two adjacent second heat dissipation fins 52 is equal. The distance between adjacent second heat dissipation fins 52 is slightly greater than the thickness of the battery cell 31.

[0064] In this embodiment, the second heat dissipation fin 52 and the third heat dissipation plate 51 are integrally formed structures. To facilitate the demolding of the second heat dissipation module 50, a transition rounded corner is provided at the connection between the second heat dissipation fin 52 and the third heat dissipation plate 51.

[0065] In this embodiment, the number of second heat dissipation fins 52 matches the number of battery cells 31, with each fin inserted between adjacent battery cells 31.

[0066] In some embodiments, the number of second heat dissipation fins 52 may not match the number of battery cells 31. When the number of second heat dissipation fins 52 is less than the number of battery cells 31, a second heat dissipation fin 52 can be inserted every few battery cells 31. When the number of second heat dissipation fins 52 is greater than the number of battery cells 31, one or more second heat dissipation fins 52 can be inserted between two adjacent battery cells 31.

[0067] In this embodiment, the two sides of the second heat dissipation fin 52 may be covered with a ceramic coating to form an insulating layer and improve the wear resistance of the second heat dissipation fin 52.

[0068] In some embodiments, if a higher heat dissipation density is required, the second heat dissipation fin 52 can be replaced with an aluminum flat tube filled with a phase change material. The latent heat of the phase change material absorbs the instantaneous temperature rise of the battery cell 31 and delays the temperature peak.

[0069] In some embodiments, thermally conductive silicone grease may be applied between the second heat sink fin 52 and the battery cell 31 to enhance contact and further improve heat dissipation.

[0070] Please see Figure 3 and Figure 5 In some embodiments, a heat-conducting part 60 is provided between the first heat dissipation module 40 and the second heat dissipation module 50.

[0071] Thus, by setting a heat-conducting part 60 between the first heat dissipation module 40 and the second heat dissipation module 50, efficient heat conduction between the two is achieved, which is conducive to improving the synergy of the overall heat dissipation structure and the efficiency of thermal management.

[0072] Specifically, in some embodiments, the heat-conducting part 60 may be thermal grease filled in the gap between the first heat dissipation module 40 and the second heat dissipation module 50, thereby enhancing the contact between the first heat dissipation module 40 and the second heat dissipation module 50 and further improving the heat dissipation capacity.

[0073] In some embodiments, the thermally conductive part 60 may also employ a composite structure of high thermal conductivity silicone grease and graphite sheet. The silicone grease is applied to the mating surface of the first heat dissipation module 40 and the second heat dissipation module 50, and the graphite sheet is attached to the outside of the silicone grease. The graphite sheet enhances lateral heat diffusion and reduces contact thermal resistance. It should be noted that graphite sheets are relatively fragile; therefore, a PI frame can be wrapped around the edges of the graphite sheet to prevent breakage and powder shedding.

[0074] Please see Figures 1 to 3 In some embodiments, the energy storage device 100 further includes a cooling fan 70, which is mounted on the housing 10 and is positioned corresponding to the cooling vent 11.

[0075] In this way, by setting the cooling fan 70 corresponding to the heat dissipation vent 11, forced air cooling of the heat dissipation duct 41 is achieved, which helps to enhance airflow and improve the overall heat dissipation capacity.

[0076] Specifically, in this embodiment, the cooling fan 70 is embedded in the cooling vent 11.

[0077] In some embodiments, each heat dissipation vent 11 is provided with two cooling fans 70 to significantly increase airflow speed and improve heat dissipation efficiency. Furthermore, a connecting piece 443 is provided in the middle of the heat dissipation duct 41, which divides the heat dissipation duct 41 into two independent ducts to correspond to the two cooling fans 70 respectively.

[0078] In some embodiments, the cooling fan 70 may also be disposed inside the housing 10, for example, the cooling fan 70 may be disposed on the first heat dissipation module 40.

[0079] Please see Figure 3In some embodiments, there are two cooling fans 70, and the two cooling fans 70 are respectively set to two cooling vents 11.

[0080] Thus, by setting cooling fans 70 at the two heat dissipation vents 11 respectively, bidirectional reciprocating or coordinated air blowing is achieved, which is beneficial to adapting to different heat dissipation conditions and enhancing the flexibility of heat dissipation.

[0081] Specifically, in this embodiment, two cooling fans 70 are respectively installed in the cooling vents 11 of the first housing 13 and the second housing 14.

[0082] In this embodiment, the two cooling fans 70 can be independently controlled by a controller. The operating modes of the two cooling fans 70 include simultaneously blowing air inward, simultaneously exhausting air outward, or one blowing and the other exhausting to form convection. The controller can control the operating modes of the two cooling fans 70 according to the user's selection, or it can automatically select the optimal airflow combination mode by collecting temperature signals from the first heat dissipation module 40 and the second heat dissipation module 50 through temperature sensors.

[0083] In this embodiment, a rubber shock-absorbing pad is provided between the fan and the housing 10 to reduce noise and resonance. Optionally, a guide vane can be added to the outside of the fan to improve airflow uniformity.

[0084] In this embodiment, the cooling fan 70 is an axial flow fan. Axial flow fans consume less power under the same air volume, and the thickness dimension of the axial flow fan is compact. The motor and impeller are arranged coaxially, without occupying additional height space of the housing 10, which is beneficial to the integration and miniaturization of the energy storage device 100.

[0085] In other embodiments, if the device needs to operate quietly, the axial fan can be replaced with a centrifugal blower. The blower is installed at the corner of the housing 10 and connected to the heat dissipation duct 41 through the air guide shroud to achieve low-speed, high-static-pressure air delivery.

[0086] Please see Figure 1 and Figure 3 In some embodiments, the battery pack 30 includes a housing 32 and a plurality of battery cells 31. The housing 32 is groove-shaped, and the plurality of battery cells 31 are disposed inside the housing 32.

[0087] In this way, by placing multiple battery cells 31 inside the slotted housing 32, the battery cell assembly 30 is integrated and fixed, which helps to save space, improve structural stability, and facilitates assembly with the heat dissipation module.

[0088] Specifically, in this embodiment, the outer casing 32 of the battery cell assembly 30 is a groove structure or a tray structure integrally formed from extruded aluminum profile. Optionally, the inner casing 32 may be provided with longitudinal and transverse ribs to separate individual battery cell 31 slots. In the embodiments of this application, such as Figure 1As shown, the bottom end of the second heat dissipation fin 52 extends beyond the bottom of the battery cell 31 but leaves a gap between it and the ground inside the outer casing 32, forming a suspended structure to provide space for the thermal expansion of the second heat dissipation fin 52.

[0089] In some embodiments, the housing 32 of the battery pack 30 may also be a one-piece structure injection molded from flame-retardant PC plastic.

[0090] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0091] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the stated features. In the description of this application, "multiple" means at least two, such as two or three, unless otherwise explicitly specified.

[0092] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An energy storage device, characterized in that, include: The housing has two heat dissipation vents. An inverter, wherein the inverter is disposed within the housing; A battery cell assembly, wherein the battery cell assembly is disposed within the housing; A first heat dissipation module is disposed between the inverter and the battery cell assembly and is thermally coupled to both the inverter and the battery cell assembly. A heat dissipation duct is formed on the first heat dissipation module and is disposed between and connected to the two heat dissipation vents.

2. The energy storage device according to claim 1, characterized in that, The housing includes a peripheral sidewall, a first shell, and a second shell. The peripheral sidewall is rectangular cylindrical. The first shell and the second shell are respectively disposed at the openings at both ends of the peripheral sidewall. The two heat dissipation vents are respectively disposed on the first shell and the second shell.

3. The energy storage device according to claim 1, characterized in that, The first heat dissipation module includes a first heat dissipation plate, a second heat dissipation plate, and a plurality of first heat dissipation fins. The first heat dissipation fins are connected to the first heat dissipation plate and the second heat dissipation plate on both sides respectively. The plurality of first heat dissipation fins extend in the same direction and are spaced apart. Two adjacent first heat dissipation fins, together with the first heat dissipation plate and the second heat dissipation plate, form a heat dissipation air duct.

4. The energy storage device according to claim 3, characterized in that, The inverter is equipped with multiple power devices, and the first heat sink is provided with multiple heat dissipation protrusions on the side of the inverter. The multiple heat dissipation protrusions are thermally coupled to the multiple power devices respectively.

5. The energy storage device according to claim 1, characterized in that, The energy storage device further includes a second heat dissipation module disposed within the housing, the second heat dissipation module being thermally coupled to the first heat dissipation module and the battery cell assembly.

6. The energy storage device according to claim 5, characterized in that, The second heat dissipation module includes a third heat dissipation plate and multiple second heat dissipation fins. The third heat dissipation plate is thermally coupled to the first heat dissipation module, and the multiple second heat dissipation fins are connected to the third heat dissipation plate. The battery cell assembly includes multiple battery cells arranged in parallel, and the multiple second heat dissipation fins are all arranged between two adjacent battery cells and thermally coupled to the two battery cells.

7. The energy storage device according to claim 5, characterized in that, A heat-conducting part is provided between the first heat dissipation module and the second heat dissipation module.

8. The energy storage device according to claim 1, characterized in that, The energy storage device also includes a cooling fan, which is mounted on the housing and is positioned corresponding to the cooling vent.

9. The energy storage device according to claim 8, characterized in that, The number of cooling fans is two, and the two cooling fans are respectively set to the two cooling vents.

10. The energy storage device according to claim 1, characterized in that, The battery pack includes a housing and a plurality of battery cells. The housing is groove-shaped, and the plurality of battery cells are disposed inside the housing.

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