Energy storage device

Abstract

The utility model discloses energy storage equipment, and belongs to the technical field of energy storage. The energy storage equipment comprises at least one battery and a host, the host and the at least one battery are stacked and located above the battery, the host comprises a shell and an electronic device, and the electronic device is installed in the shell and electrically connected with the battery. And a heat dissipation cavity is formed between the bottom surface of the shell and the top surface of the adjacent battery and is communicated with the outside. The heat dissipation cavity communicated with the outside is formed between the bottom surface of the shell and the top surface of the uppermost battery, so that heat generated when the batteries work is taken away through air convection, the possibility that the heat of the batteries is transmitted to a host is reduced, the heat dissipation effect is optimized, the service life of the host is prolonged, and the reliability of the energy storage equipment is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of energy storage, and particularly relates to an energy storage device. BACKGROUND

[0002] With the continuous development and utilization of clean energy such as solar energy and wind energy, household energy storage devices have been widely applied to families. The household energy storage device is mainly used in cooperation with a photovoltaic power generation system and a wind power generation system. When the photovoltaic system and the wind power generation system generate power, part of the energy is used for the household load, and the energy exceeding the load can be stored in the household energy storage system. Meanwhile, the household energy storage device can also provide a peak load shifting mode, thereby saving economic cost. The current household energy storage device often includes a main machine and a plurality of battery modules arranged in sequence. Although the energy storage and management can be realized, the heat dissipation effect is poor, especially in the process of high-power charging and discharging, which affects the service life and performance. CONTENT OF THE UTILITY MODEL

[0003] The application aims to at least solve one of the technical problems existing in the prior art. To this end, the application provides an energy storage device, which improves the heat dissipation effect, prolongs the service life and reliability of the energy storage device.

[0004] In a first aspect, the application provides an energy storage device, comprising:

[0005] at least one battery;

[0006] a main machine, the main machine and the at least one battery are arranged in stack and located above the battery, the main machine comprises a shell and an electronic device, the electronic device is installed in the shell and electrically connected with the battery, a heat dissipation cavity is formed between the bottom surface of the shell and the top surface of the adjacent battery, and the heat dissipation cavity is connected with the outside.

[0007] According to the energy storage device of the application, compared with the close fit of the main machine and the battery in the related art, the heat dissipation cavity connected with the outside is formed between the bottom surface of the shell and the top surface of the uppermost battery, so that the heat generated by the battery during operation is taken away by air convection, the possibility of heat transfer from the battery to the main machine is reduced, the heat dissipation effect is optimized, the service life of the main machine is prolonged, and the reliability of the energy storage device is improved.

[0008] According to one embodiment of the application, at least one outer side wall of the shell is provided with a heat dissipation hole, and the heat dissipation hole is connected with the heat dissipation cavity.

[0009] According to one embodiment of the application, the inner wall of the heat dissipation cavity is provided with a plurality of heat dissipation fins; and / or

[0010] the outer wall of the shell is provided with a plurality of heat dissipation fins distributed at intervals; and / or

[0011] At least one outer side wall of the battery is provided with a plurality of heat dissipation fins.

[0012] According to an embodiment of the present application, the bottom of the shell is concave upward to form an avoiding groove, and the inner wall of the heat dissipation cavity comprises the inner wall of the avoiding groove and the top surface of the battery adjacent to the avoiding groove.

[0013] According to an embodiment of the present application, the bottom of the avoiding groove is provided with a plurality of heat dissipation fins, and the heat dissipation fins are spaced apart from the end of the avoiding groove and the top surface of the battery adjacent to the avoiding groove.

[0014] According to an embodiment of the present application, the shell forms a heat dissipation hole, and the heat dissipation hole is located at the inner side wall of the avoiding groove.

[0015] According to an embodiment of the present application, the shell comprises:

[0016] a lower shell forming a containing groove and the avoiding groove, the opening of the containing groove is upward, and the opening of the avoiding groove is downward;

[0017] a top cover covering the opening of the containing groove, the bottom surface of the top cover and the inner wall of the containing groove jointly form a containing space for installing the electronic device.

[0018] According to an embodiment of the present application, the electronic device comprises a circuit board, a power device and a magnetic device, and the power device and the magnetic device are respectively arranged on two sides of the circuit board.

[0019] According to an embodiment of the present application, the top cover forms a glue filling groove, and the glue filling groove is filled with potting glue for packaging the magnetic device; and / or

[0020] A heat conduction member is arranged between the bottom of the containing groove and the power device.

[0021] According to an embodiment of the present application, the lower shell comprises:

[0022] a bottom plate;

[0023] a plurality of side plates connected in sequence, the plurality of side plates are arranged outside the bottom plate, and the two ends of the side plates protrude from the end surfaces of the bottom plate, the first end surface of the bottom plate and the inner wall of the side plate form the containing groove, and the second end surface of the bottom plate and the inner wall of the side plate form the avoiding groove.

[0024] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings in which:

[0026] Figure 1 is one of structural schematic diagrams of the energy storage device provided by the embodiments of the present application;

[0027] Figure 2 is another of structural schematic diagrams of the energy storage device provided by the embodiments of the present application;

[0028] Figure 3 is one of structural schematic diagrams of the housing provided by the embodiments of the present application;

[0029] Figure 4 is another of structural schematic diagrams of the housing provided by the embodiments of the present application;

[0030] Figure 5 is one of exploded views of the housing provided by the embodiments of the present application;

[0031] Figure 6 is another of exploded views of the housing provided by the embodiments of the present application.

[0032] Reference Signs:

[0033] 100, battery;

[0034] 200, host;

[0035] 211, circuit board; 212, power device; 213, magnetic device;

[0036] 220, housing;

[0037] 221, lower housing; 2211, accommodating groove; 2212, avoiding groove;

[0038] 22101, bottom plate; 22102, side plate;

[0039] 222, top cover; 2221, glue pouring groove;

[0040] 300, heat dissipation hole; 400, heat dissipation fin. DETAILED DESCRIPTION

[0041] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0042] The embodiments of the present application are described below with reference to the drawings. Figures 1-6The energy storage device provided by the embodiment of the present application is described. The energy storage device comprises at least one battery 100 and a host 200.

[0043] The battery 100 is used to store and release electric energy to meet the energy demand. It usually comprises a box body and a plurality of battery monomers, including but not limited to lithium battery monomers, lead-acid battery monomers or nickel-hydrogen battery monomers. It should be noted that the number, design and configuration of the battery 100 can be optimized according to the specific application scenario and requirements, and the embodiment does not make specific limitations.

[0044] The host 200 and the at least one battery 100 are stacked and located above the battery 100 (the installation direction is not limited to be stacked up and down, and other application scenarios can be stacked obliquely or horizontally), the host 200 comprises a shell 220 and electronic devices, the electronic devices are installed in the shell 220 and electrically connected with the battery 100, a heat dissipation cavity is formed between the bottom surface of the shell 220 and the top surface of the adjacent battery 100, and the heat dissipation cavity is in communication with the outside. Exemplarily, the material of the shell 220 comprises but is not limited to die-cast aluminum.

[0045] It should be noted that the host 200 can monitor the voltage, current and temperature and other parameters of each battery 100 through the electronic devices, and adjust the charging and discharging process of the battery 100. The host 200 can also receive external instructions and control the distribution and scheduling of electric energy according to the demand, to ensure the efficient and stable operation of the energy storage device.

[0046] It can be understood that, compared with the close fit of the host 200 and the battery 100 in the related art, by forming the heat dissipation cavity in communication with the outside between the bottom surface of the shell 220 and the top surface of the uppermost battery 100, the heat generated by the battery 100 during operation can be taken away by air convection, the possibility of heat transfer from the battery 100 to the host 200 is reduced, the heat dissipation effect is optimized, the service life of the host 200 is prolonged, and the reliability of the energy storage device is improved.

[0047] It should be noted that the application scenarios of the energy storage device include but are not limited to family residence, commercial building, industrial facility or agricultural technology greenhouse, and the embodiment does not make limitations. That is, when the energy storage device is located in an outdoor environment with wind, the heat dissipation cavity can improve the efficiency of air convection and increase the heat dissipation effect.

[0048] According to the energy storage device provided by the embodiment of the present application, the heat dissipation effect is improved, the service life and reliability of the energy storage device are prolonged.

[0049] In some embodiments, as shown in Figure 1 and Figure 2 , the outer side wall of the shell 220 is aligned with the corresponding outer side wall of the battery 100. The shapes of the shell 220 and the battery 100 include but are not limited to square.

[0050] It can be understood that the width and length of the shell 220 are adapted to the width and length of the battery 100 respectively, which not only facilitates the direct installation of the host 200 on the battery 100, ensures that the space occupied by the energy storage device is as small as possible, but also enables the air flow in the heat dissipation cavity to be smoother, optimizes the heat dissipation path, and reduces heat accumulation. Further improve the heat dissipation efficiency.

[0051] In some embodiments, as shown in Figures 1 to 6 At least one outer side wall of the shell 220 is provided with a heat dissipation hole 300, and the heat dissipation hole 300 is in communication with the heat dissipation cavity. It should be noted that the number, specific distribution and shape of the heat dissipation hole 300 can be designed according to actual needs, and this embodiment does not make specific limitations.

[0052] It can be understood that the heat dissipation hole 300 is in communication with the heat dissipation cavity, so that cold air can enter the heat dissipation cavity while hot air is discharged, forming effective air convection, thereby improving the heat dissipation efficiency. In addition, the design of the heat dissipation hole 300 ensures that the hot air in the heat dissipation cavity can be directly discharged, avoiding the secondary circulation of the hot air between the host 200 and the battery 100, thereby improving the reliability of heat dissipation.

[0053] In some embodiments, as shown in Figures 1 to 6 At least one of the left side wall, the right side wall and the rear side wall of the shell 220 is provided with a heat dissipation hole 300. In this embodiment, as shown in Figure 4 The left side wall, the right side wall and the rear side wall of the shell 220 are all provided with heat dissipation holes 300, a part of the heat dissipation holes 300 are respectively distributed in the left side wall and the right side wall of the shell 220 along the front-rear direction, and another part of the heat dissipation holes 300 are distributed in the rear side wall of the shell 220 along the left-right direction, in order to improve the heat dissipation efficiency as much as possible.

[0054] In some embodiments, as shown in Figure 4 and Figure 6 The inner wall of the heat dissipation cavity is provided with a plurality of heat dissipation fins 400. It should be noted that the number, specific distribution and shape of the heat dissipation fins 400 in the heat dissipation cavity can be designed according to actual needs, and this embodiment does not make specific limitations. Exemplarily, the inner upper wall of the heat dissipation cavity is provided with a plurality of heat dissipation fins 400 which are spaced in the front-rear direction.

[0055] It can be understood that the surface area of the inner wall of the heat dissipation cavity is increased by the heat dissipation fins 400, which can more quickly transfer heat to the heat dissipation cavity, optimize the airflow flow in the heat dissipation cavity, and exchange heat with the outside air through the heat dissipation hole 300. At the same time, the design of the heat dissipation fins 400 makes full use of the internal space of the heat dissipation cavity, and maintains the overall compactness of the energy storage device.

[0056] In some embodiments, as shown in Figures 1 to 6As shown, the outer wall of the shell 220 is provided with a plurality of spaced heat dissipation fins 400. It should be noted that the number, specific distribution and shape of the heat dissipation fins 400 on the outer wall of the shell 220 can be designed according to actual needs, and the present embodiment does not make specific limitations. Exemplarily, the rear side wall of the shell 220 is provided with a plurality of heat dissipation fins 400 spaced in the left-right direction; the upper surface of the shell 220 is provided with a plurality of heat dissipation fins 400 spaced in the front-rear direction.

[0057] It can be understood that by providing a plurality of spaced heat dissipation fins 400 on the outer wall of the shell 220, the heat dissipation area is significantly increased, the heat can be more evenly distributed, and the heat transfer efficiency is improved.

[0058] In some embodiments, as shown in Figure 2 At least one outer side wall of the battery 100 is provided with a plurality of spaced heat dissipation fins 400. It should be noted that the number, specific distribution and shape of the heat dissipation fins 400 on the outer wall of the battery 100 can be designed according to actual needs, and the present embodiment does not make specific limitations. Exemplarily, the rear wall of the battery 100 is provided with a plurality of heat dissipation fins 400 spaced in the left-right direction.

[0059] It can be understood that by providing a plurality of spaced heat dissipation fins 400 on the outer wall of the battery 100, the heat dissipation area of the battery 100 is significantly increased, the heat can be more evenly distributed, and the heat transfer efficiency is improved.

[0060] In some embodiments, as shown in Figure 2 The heat dissipation fins 400 on the outer side wall of the shell 220 and the heat dissipation fins 400 on the outer side wall of the battery 100 are aligned one by one, ensuring the shortest heat conduction path, reducing heat loss during conduction, and allowing air to flow smoothly between the heat dissipation fins 400, forming an efficient convective heat dissipation path.

[0061] In some embodiments, as shown in Figure 4 and Figure 6 The bottom of the shell 220 is recessed upward to form a clearance groove 2212, and the inner wall of the heat dissipation cavity includes the inner wall of the clearance groove 2212 and the top surface of the adjacent battery 100. It should be noted that the shape, size and dimensions of the clearance groove 2212 can be designed according to actual needs, and the present embodiment does not make specific limitations. Exemplarily, the distance between the groove bottom and the top surface of the uppermost battery 100 is 20mm.

[0062] It can be understood that the clearance groove 2212 formed by the upward recess of the bottom of the shell 220, and the top surface of the uppermost battery 100 covers the slot opening of the clearance groove 2212, to form a heat dissipation cavity without increasing additional space, making the entire energy storage device more compact.

[0063] In some embodiments, the bottom of the shell 220 is provided with a downwardly extending protrusion connected to the top surface of the uppermost battery 100, or the top surface of the uppermost battery 100 is provided with an upwardly extending protrusion for supporting the shell 220. That is, by providing the protrusion, a certain heat dissipation distance is formed between the bottom surface of the shell 220 and the top surface of the uppermost battery 100, thereby directly forming a heat dissipation cavity in communication with the outside.

[0064] In some embodiments, as shown in Figure 4 and Figure 6 , the bottom of the avoidance groove 2212 is provided with a plurality of heat dissipation fins 400, and the end of the heat dissipation fin 400 away from the avoidance groove 2212 is spaced apart from the top surface of the adjacent battery 100.

[0065] It can be understood that the bottom of the avoidance groove 2212 is provided with a plurality of heat dissipation fins 400, that is, the top end of the heat dissipation fin 400 located in the avoidance groove 2212 is connected to the bottom of the avoidance groove 2212, and the bottom end is spaced apart from the top surface of the uppermost battery 100. Not only increases the heat dissipation area, but also provides space for air flow in the heat dissipation cavity, ensuring that heat can be dissipated more effectively.

[0066] In some embodiments, as shown in Figure 4 and Figure 6 , the shell 220 forms a heat dissipation hole 300 on the inner side wall of the avoidance groove 2212, so that heat can be directly conducted from the heat dissipation cavity to the outside through the heat dissipation hole 300, that is, the avoidance groove 2212 is connected to the outside through the heat dissipation hole 300, reducing the accumulation of heat.

[0067] In this embodiment, as shown in Figure 4 and Figure 6 , a part of the plurality of heat dissipation holes 300 are located on the inner left side wall and the inner right side wall of the avoidance groove 2212 and penetrate through the shell 220, and another part of the plurality of heat dissipation holes 300 are located on the inner back wall of the avoidance groove 2212 and penetrate through the shell 220.

[0068] In some embodiments, as shown in Figure 5 and Figure 6 , the shell 220 includes a lower shell 221 and a top cover 222, the lower shell 221 forms the containing groove 2211 and the avoidance groove 2212, the opening of the containing groove 2211 faces upward, and the opening of the avoidance groove 2212 faces downward; the top cover 222 is arranged at the opening of the containing groove 2211, and the bottom surface of the top cover 222 and the inner wall of the containing groove 2211 jointly form a containing space for mounting electronic devices. It should be noted that the size and shape of the containing groove 2211 and the containing space can be designed according to actual needs, and this embodiment does not make specific limitations.

[0069] It can be understood that the accommodation groove 2211 and the avoidance groove 2212 are sequentially arranged from top to bottom, so that the electronic device is placed in the accommodation groove 2211 and located above the avoidance groove 2212, and the heat generated by the electronic device during operation can be effectively dissipated by using the formed heat dissipation cavity, and the possibility of heat generated by the battery 100 during operation being transmitted to the accommodation groove 2211 is reduced, thereby improving the reliability of the energy storage device.

[0070] In the embodiment, as shown in Figure 5 and Figure 6 , the upper surface of the top cover 222 is provided with the heat dissipation fins 400, and the rear side wall of the lower shell 221 is provided with the heat dissipation fins 400.

[0071] In some embodiments, as shown in Figure 5 and Figure 6 , the lower shell 221 includes a bottom plate 22101 and a plurality of side plates 22102 connected in sequence. The plurality of side plates 22102 are arranged outside the bottom plate 22101, and the two ends of the side plate 22102 protrude from the end surface of the bottom plate 22101. The first end surface of the bottom plate 22101 and the inner wall of the side plate 22102 form the accommodation groove 2211, and the second end surface of the bottom plate 22101 and the inner wall of the side plate 22102 form the avoidance groove 2212. Exemplarily, the bottom plate 22101 and the side plate 22102 are both square, and four side plates 22102 are provided. It should be noted that the number of side plates 22102 and the shapes of the bottom plate 22101 and the side plate 22102 can be designed according to actual needs, and the embodiment does not make specific limitations.

[0072] It can be understood that the bottom plate 22101 extends in the horizontal direction, and the side plate 22102 extends in the vertical direction. The middle part of the plurality of side plates 22102 is connected to the outer side wall of the bottom plate 22101, so that the upper end surface of the side plate 22102 can protrude from the upper end surface (i.e. the first end surface) of the bottom plate 22101, and the lower end surface of the side plate 22102 can protrude from the lower end surface (i.e. the second end surface) of the bottom plate 22101, thereby realizing the formation of the accommodation groove 2211 and the avoidance groove 2212. It should be noted that the first end surface and the second end surface can also be two opposite surfaces of the bottom plate 22101 in other directions, which can be adjusted according to the mounting direction of the shell 220, and the embodiment does not make specific limitations.

[0073] In some embodiments, as shown in Figure 5 and Figure 6 , the electronic device includes a circuit board 211, a power device 212, and a magnetic device 213. The power device 212 and the magnetic device 213 are arranged on both sides of the circuit board 211.

[0074] It can be understood that the circuit board 211 as the core of the electronic device carries the control and management functions, including but not limited to the battery management system (BMS), the inverter and the DC-DC converter, etc. The power device 212 is used to control the processing and conversion of electric energy, including but not limited to MOSFET and IGBT, etc. The magnetic device 213 is used for energy conversion and signal transmission, including but not limited to inductor and transformer, etc. The power device 212 and the magnetic device 213 are respectively arranged on both sides of the circuit board 211, fully utilizing the accommodation space while effectively reducing the electromagnetic interference between them, optimizing the heat dissipation path, reducing the heat accumulation, and improving the overall heat dissipation efficiency.

[0075] In some embodiments, as shown in Figure 6 The top cover 222 forms a glue filling groove 2221, and the glue filling groove 2221 is filled with potting glue for packaging the magnetic device 213. It should be noted that the number and shape of the glue filling groove 2221 can be designed according to actual needs, and the present embodiment does not make specific limitations. The potting glue includes but is not limited to epoxy resin glue, silicone glue, polyurethane glue, UV glue, or hot melt glue, etc.

[0076] It can be understood that the potting glue filled in the glue filling groove 2221 can form a bonding, sealing and insulating structure, so as to package the magnetic device 213 between the circuit board 211 and the cover plate. The potting glue has good thermal conductivity, improves the heat dissipation efficiency, can quickly conduct the heat generated by the magnetic device 213 during operation to the outside of the shell 220, and plays a role in isolating moisture, chemicals and mechanical impact in the external environment, protecting the magnetic device 213 from damage and prolonging its service life.

[0077] In some embodiments, a heat-conducting piece is arranged between the groove bottom of the accommodating groove 2211 and the power device 212. The heat-conducting piece includes but is not limited to ceramic gasket and heat-conducting silicone grease, etc.

[0078] It can be understood that the power device 212 will generate a large amount of heat during operation, and there may be micro gaps between the surface of the power device 212 and the heat dissipation structure. By arranging the heat-conducting piece, these gaps can be filled, thereby significantly reducing the contact thermal resistance and playing a certain protection role to reduce the possibility of mechanical impact or chemical corrosion of the power device 212.

[0079] In addition, the magnetic device 213 and the power device 212 are respectively located on the upper and lower sides of the circuit board 211, and in combination with the fact that the magnetic device 213 has higher heat generation than the power device 212, not only the heat dissipation efficiency can be improved, but also the cost of the overall glue filling process can be reduced, thereby achieving the effect of lightweight of the host 200.

[0080] The terms "first", "second", and the like in the description and in the claims of this application are used for distinguishing between similar objects and are not necessarily used to describe a particular sequential or chronological order. It is to be understood that the use of the terms so construed can interchange depending on the context in which it is used, and that the embodiments of this application can be, where appropriate, practiced in the sequence other than that which is described herein. Also, the terms "first", "second", and the like are not necessarily used to describe a collection of objects unless the context clearly indicates so. Furthermore, the terms "top", "bottom", "over", "under", and the like in the description and the claims of this application are used for descriptive purposes and not necessarily for describing relative positions, unless otherwise stated. It is to be understood that the terms so used are interchangeable under appropriate circumstances and / or depending on the embodiments illustrated.

[0081] In the description of the application, it is to 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", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships as shown in the drawings, and are used for convenience in describing the present application and simplifying the description, and thus cannot be construed as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus cannot be understood as limiting the application.

[0082] In the description of the application, "first feature" and "second feature" can include one or more of the features.

[0083] In the description of the application, "a plurality of" means two or more.

[0084] In the description of the application, "above", "over", and "on" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them.

[0085] In the description of the application, "above", "over", and "on" of a first feature to a second feature include that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height.

[0086] In the description of the application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the description of the application, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0087] While the embodiments of the application have been shown and described, it is to be understood that the embodiments can be varied, modified, substituted and changed by those skilled in the art without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. An energy storage device, characterized in that, include: At least one battery; A host computer and at least one of the batteries are stacked and positioned above the batteries. The host computer includes a housing and electronic components. The electronic components are installed inside the housing and electrically connected to the batteries. A heat dissipation cavity is formed between the bottom surface of the housing and the top surface of the adjacent battery, and the heat dissipation cavity is connected to the outside.

2. The energy storage device according to claim 1, characterized in that, At least one outer side wall of the outer casing is provided with a heat dissipation hole, which is connected to the heat dissipation cavity.

3. The energy storage device according to claim 1, characterized in that, The inner wall of the heat dissipation cavity is provided with multiple heat dissipation fins; and / or The outer wall of the outer casing is provided with a plurality of spaced heat dissipation fins; and / or At least one outer side wall of the battery is provided with spaced heat dissipation fins.

4. The energy storage device according to any one of claims 1 to 3, characterized in that, The bottom of the outer casing is recessed upward to form a clearance groove, and the inner wall of the heat dissipation cavity includes the inner wall of the clearance groove and the top surface of the adjacent battery.

5. The energy storage device according to claim 4, characterized in that, The bottom of the clearance groove is provided with a plurality of heat dissipation fins, and the ends of the heat dissipation fins facing away from the clearance groove are spaced apart from the top surface of the adjacent battery.

6. The energy storage device according to claim 4, characterized in that, The outer casing forms heat dissipation holes, which are located on the inner sidewall of the clearance groove.

7. The energy storage device according to claim 4, characterized in that, The outer casing includes: The lower housing forms a receiving groove and a clearance groove, with the opening of the receiving groove facing upwards and the opening of the clearance groove facing downwards; A top cover is provided at the opening of the receiving groove. The bottom surface of the top cover and the inner wall of the receiving groove together form a receiving space, which is used to install the electronic device.

8. The energy storage device according to claim 7, characterized in that, The electronic device includes a circuit board, a power device, and a magnetic device, with the power device and the magnetic device respectively disposed on both sides of the circuit board.

9. The energy storage device according to claim 8, characterized in that, The top cover forms a potting groove, which is filled with potting compound for encapsulating the magnetic device; and / or A heat-conducting element is provided between the bottom of the receiving tank and the power device.

10. The energy storage device according to claim 7, characterized in that, The lower housing includes: Base plate; Multiple side plates are connected end to end, and the multiple side plates surround the outside of the base plate. The two ends of the side plates protrude from the end face of the base plate. The first end face of the base plate and the inner wall of the side plate form the receiving groove, and the second end face of the base plate and the inner wall of the side plate form the avoidance groove.

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