Energy storage device, battery device, energy storage system and charging network

Abstract

The utility model is suitable for the technical field of energy storage, and provides an energy storage device, a battery device, an energy storage system and a charging network, and the energy storage device comprises a cabinet body which is provided with an accommodation space; the battery device is accommodated in the accommodating space; the heat exchange structure is contained in the cabinet body, the heat exchange structure comprises a bearing part and a heat dissipation part connected to the bearing part, the bearing part is used for bearing the battery device and exchanging heat with the battery device, and the heat dissipation part is attached to the cabinet body; according to the energy storage device provided by the embodiment of the invention, the heat on the battery device is transferred to the cabinet body through the heat exchange structure, and the cabinet body can be cooled through heat exchange with the external environment, so that the battery device is cooled; the heat exchange structure is matched with the heat exchange mode of the cabinet body and the external environment to dissipate heat, so that the space occupied by the water cooling unit or the air cooling unit is saved, more battery devices can be conveniently installed in the cabinet body, and the space utilization rate in the cabinet body is improved.

Description

Technical Field

[0001] This application belongs to the technical field of energy storage, and particularly relates to an energy storage device, a battery device, an energy storage system, and a charging network. Background Art

[0002] In current energy storage devices, a water cooling unit or an air cooling unit is usually arranged in a cabinet to cool the battery device in the cabinet. Since the cabinet usually has a fixed size specification, and the volume of the water cooling unit or the air cooling unit is usually large, the setting of the water cooling unit or the air cooling unit easily occupies the installation space of the battery device and results in a low capacity of the energy storage device. Summary of the Utility Model

[0003] In view of the above problems, this application provides an energy storage device, a battery device, an energy storage system, and a charging network, which can reduce the occupation of the internal space of the cabinet by the temperature control structure.

[0004] In a first aspect, this application provides an energy storage device, including:

[0005] A cabinet having an accommodation space; a battery device accommodated in the accommodation space; a heat exchange structure accommodated in the cabinet, the heat exchange structure including a bearing part and a heat dissipation part connected to the bearing part, the bearing part being used for bearing the battery device and performing heat exchange with the battery device, and the heat dissipation part being attached to the cabinet.

[0006] In the technical solution of this embodiment, a heat exchange structure is provided, and the heat on the battery device is transferred to the cabinet through the heat exchange structure, and the cabinet can be cooled by heat exchange with the external environment, so as to realize the cooling of the battery device; heat dissipation is achieved by means of the heat exchange structure and in cooperation with the heat exchange between the cabinet and the external environment, saving the space occupied by the water cooling unit or the air cooling unit, facilitating the installation of more battery devices in the cabinet, and improving the space utilization rate inside the cabinet.

[0007] In some embodiments, a flow channel is provided in the heat exchange structure, the flow channel extends from the bearing part to the heat dissipation part, and a heat exchange medium is accommodated in the flow channel.

[0008] In the technical solution of this embodiment, a flow channel is provided in the heat exchange structure, and a heat exchange medium is provided in the flow channel to carry and transfer heat through the heat exchange medium, so as to better transfer the heat of the battery device to the cabinet.

[0009] In some embodiments, the heat exchange medium is a phase change material.

[0010] In the technical solution of this embodiment, the heat exchange medium is a phase change material, so that the phase change material can carry heat and flow autonomously in the flow channel to better transfer the heat of the battery device to the cabinet body; and this setting does not require a device for driving the heat exchange medium to flow in the heat exchange structure, thereby further reducing the space occupied by the heat exchange structure and improving the utilization rate of the internal space of the cabinet body.

[0011] In some embodiments, the inner diameter of the flow channel is less than or equal to 1 mm.

[0012] In the technical solution of this embodiment, the inner diameter of the flow channel is less than or equal to 1 mm, so that the heat exchange medium can flow to various positions of the first flow channel under the action of its own tension, so that the heat exchange medium can transfer the heat on the battery device more comprehensively, reduce the blind area in the heat exchange process, improve the uniformity and consistency of heat exchange, and reduce the risk of local overheating; at the same time, this setting can also reduce the processing difficulty of the flow channel.

[0013] In some embodiments, the heat exchange structure is a heat-conducting structural member.

[0014] In the technical solution of this embodiment, the heat exchange structure is a heat-conducting structural member, so that the heat exchange structure can transfer the heat on the battery device to the cabinet body better and more efficiently.

[0015] In some embodiments, the heat dissipation part and the bearing part are arranged at an angle, and the heat dissipation part is attached to the side wall of the cabinet body.

[0016] The technical solution of this embodiment provides some specific structures of the heat exchange structure, so that the bearing part can better and more comprehensively correspond to the corresponding wall surface of the battery device, and can better and more comprehensively perform heat exchange with the corresponding side of the corresponding battery device, thereby improving the uniformity and consistency of heat exchange between the heat dissipation structure and the battery device; at the same time, it is also convenient to fit the heat dissipation part to the cabinet body, so that the heat dissipation part can transfer heat to the cabinet body better.

[0017] In some embodiments, a first heat-conducting layer is provided between the heat dissipation part and the cabinet body, and one side of the first heat-conducting layer is connected to the heat dissipation part and the other side is connected to the cabinet body.

[0018] In the technical solution of this embodiment, the first heat-conducting layer is provided and the heat dissipation part is connected to the cabinet body through the first heat-conducting layer, so that the heat dissipation part can exchange heat with the cabinet body better and more efficiently, and the stability of the structure is improved.

[0019] In some embodiments, the battery device includes a box body and battery cells accommodated in the box body; at least part of the bearing part is accommodated in the box body and used for bearing the battery cells, and the heat dissipation part is located outside the box body.

[0020] The technical solution of this embodiment provides some specific structures of battery devices, such that at least a part of the bearing part is located inside the box, so that the bearing part can be in direct contact with the battery cell, thereby further improving the heat exchange efficiency of the bearing part.

[0021] In some embodiments, the battery cell includes a housing, the housing includes a first surface and a plurality of second surfaces different from the first surface, and electrode terminals are provided on the first surface; at least one of the plurality of second surfaces is arranged to perform heat exchange with the bearing part.

[0022] The technical solution of this embodiment provides some structures of battery cells, such that the bearing part and the electrode terminals are respectively located on different surfaces of the housing, so as to reduce the negative impact of the electrode terminals on the connection area between the bearing part and the housing, and enable the bearing part to better fit the housing, so that the bearing part can better perform heat exchange with the battery cell.

[0023] In some embodiments, along the height direction of the cabinet body, the electrode terminals are located above the housing, and the bearing part is located below the housing.

[0024] The technical solution of this embodiment further provides some relative positions between the bearing part and the battery cell, so that the bearing part can not only perform heat exchange with the battery cell, but also provide support for the battery cell.

[0025] In some embodiments, a second heat conducting layer is provided between the battery cell and the bearing part, and one side of the second heat conducting layer is connected to the battery cell and the other side is connected to the bearing part.

[0026] In the technical solution of this embodiment, the second heat conducting layer is provided, and the battery cell is connected to the bearing part through the second heat conducting layer, so that the battery cell can better and more efficiently perform heat exchange with the bearing part, and at the same time, the battery cell can be more stably connected to the bearing part, improving the stability of the structure.

[0027] In some embodiments, the cabinet body is a standard container cabinet body, and along the height direction of the cabinet body, a plurality of battery devices are stacked, and the heat dissipation part is located at the first end along the width direction of the cabinet body.

[0028] The technical solution of this embodiment provides some arrangement manners of battery devices in the cabinet body, so that the heat dissipation parts corresponding to each battery device can be attached to the cabinet body, so as to facilitate each heat exchange structure to transfer the heat of the corresponding battery device to the cabinet body.

[0029] In some embodiments, the energy storage device further includes a heat dissipation structure, the heat dissipation structure is correspondingly arranged with the heat dissipation part, and the heat dissipation structure is arranged outside the first end along the width direction of the cabinet body.

[0030] In the technical solution of this embodiment, a heat dissipation structure is provided on the cabinet to improve the heat exchange efficiency between the cabinet and the external environment and enable the cabinet to dissipate heat better, thereby better reducing the temperature of the battery device and reducing the overall temperature of the energy storage device.

[0031] In some embodiments, the cabinet body includes a cabinet door, which is disposed at a second end portion of the cabinet body along a width direction thereof, and the cabinet door can close or open a receiving space of the cabinet body.

[0032] In the technical solution of this embodiment, a cabinet door is arranged on the second end portion of the cabinet along its width direction, and the heat dissipation structure is located on the first end plate of the cabinet along its width direction. At this time, the heat dissipation structure is located on the side of the cabinet away from the cabinet door, and correspondingly, the heat dissipation part is also connected to the side of the cabinet away from the cabinet door. This arrangement enables the heat exchange structures corresponding to each battery device to be connected to the cabinet and to exchange heat with the external environment through the heat dissipation structure on the cabinet; at the same time, it is also arranged to reduce the interference caused by the arrangement of the heat dissipation part to the opening and closing of the cabinet door and the maintenance of the battery device.

[0033] In a second aspect, an embodiment of the present application further provides a battery device, including:

[0034] A box body; a battery cell contained in the box body; a heat exchange structure comprising a bearing portion and a heat dissipation portion connected to the bearing portion, at least part of the bearing portion is contained in the box body and used to bear the battery cell, and the heat dissipation portion is located outside the box body.

[0035] In the technical solution of this embodiment, at least part of the load-bearing part is located inside the box body, so that the load-bearing part can directly contact the battery cell, thereby improving the heat exchange efficiency of the load-bearing part; the heat dissipation part is located outside the box body, so that the heat exchange structure can conduct the heat inside the box body to the outside of the box body, so as to better reduce the temperature inside the box body.

[0036] In some embodiments, the battery cell includes a shell, the shell includes a first surface and multiple second surfaces different from the first surface, the first surface is provided with an electrode terminal; at least one of the multiple second surfaces is configured to perform heat exchange with the supporting portion.

[0037] In the technical solution of this embodiment, the bearing part and the electrode terminal are respectively located on different surfaces of the shell to reduce the negative impact of the electrode terminal on the connection area between the bearing part and the shell, and to enable the bearing part to better fit with the shell so that the bearing part can better exchange heat with the battery cell.

[0038] In some embodiments, along the height direction of the battery device, the electrode terminal is located above the shell, and the supporting portion is located below the shell.

[0039] The technical solution of this embodiment further provides some relative positions of the bearing part and the battery cell, so that the bearing part can not only exchange heat with the battery cell, but also provide support for the battery cell.

[0040] In a third aspect, an embodiment of the present application further provides an energy storage system, including a power conversion device and the energy storage device provided by some embodiments of the first aspect. The power conversion device is disposed inside or outside the accommodation space of the energy storage device.

[0041] In a fourth aspect, an embodiment of the present application further provides a charging network, including the energy storage device provided by some embodiments of the first aspect; or the energy storage system provided by some embodiments of the third aspect; and a charging pile. The energy storage device is used to provide electric energy for the charging pile.

[0042] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specific embodiments of the present application are specifically exemplified. Description of the Drawings

[0043] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0044] Figure 1 is a schematic perspective view of an energy storage device provided by some embodiments of the present application;

[0045] Figure 2 is a schematic cross-sectional view of an energy storage device provided by some embodiments of the present application;

[0046] Figure 3 is a schematic perspective view of a heat exchange structure provided by some embodiments of the present application;

[0047] Figure 4 is a schematic cross-sectional view of a heat exchange structure provided by some embodiments of the present application Figure 1 ;

[0048] Figure 5 is a schematic cross-sectional view of a heat exchange structure provided by some embodiments of the present application Figure 2 ;

[0049] Figure 6 is Figure 2 a partial enlarged schematic view of part A in

[0050] Figure 7Schematic three-dimensional view of a battery device provided by some embodiments of the present application;

[0051] Figure 8 Cross-sectional view of a battery device and a heat exchange structure provided by some embodiments of the present application;

[0052] Figure 9 Schematic view of an energy storage system provided by some embodiments of the present application;

[0053] Figure 10 Schematic view of a charging network provided by some embodiments of the present application.

[0054] The meanings of the markings in the figure are as follows:

[0055] 100, energy storage device;

[0056] 10, cabinet; 101, accommodation space; 102, opening; 103, first end; 104, second end; 11, heat dissipation structure; 12, cabinet door;

[0057] 20, battery device; 21, box body; 22, battery cell; 221, housing; 2211, first surface; 2212, second surface; 222, electrode terminal;

[0058] 30, heat exchange structure; 31, bearing part; 32, heat dissipation part; 33, flow channel; 331, first flow channel; 332, second flow channel;

[0059] 40, first heat conduction layer;

[0060] 50, second heat conduction layer;

[0061] 200, power conversion device;

[0062] 300, power generation device;

[0063] 400, charging pile;

[0064] 500, connector. Detailed implementation manners

[0065] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0067] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0068] Reference to "an embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase does not necessarily refer to the same embodiment every time it appears in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0069] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0070] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0071] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0072] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "coupling", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0073] An energy storage device is a device integrating a battery device and a control cabinet. The control cabinet is coupled to the battery device to manage the battery device and realizes the storage and output of electric energy through the conversion between electric energy and chemical energy. The battery device can be used as a backup power source, or perform peak shaving and valley filling when the power supply of the power system is uneven, or perform frequency modulation when the load or power generation of the power system is large, or be applied to a photovoltaic energy storage power generation system.

[0074] In the energy storage device, due to the large number of battery devices, during the charging and discharging process of the energy storage device, the temperature of the battery devices will rise and a large amount of heat will be generated, resulting in a relatively high temperature inside the energy storage device. And the battery devices are highly sensitive to the working temperature, and a relatively high working environment temperature is likely to cause the efficiency of the battery devices to decrease.

[0075] In order to enable the battery devices to perform charge and discharge cycles with relatively high efficiency, a water cooling unit or an air cooling unit is usually provided in the current energy storage device to reduce the temperature inside the energy storage device, so as to provide a relatively suitable working environment temperature for the battery devices. However, since the cabinet of the energy storage device usually has a fixed specification and size, and the volume of the water cooling unit or the air cooling unit is usually large, installing the water cooling unit or the air cooling unit in the cabinet will occupy the installation space of the battery devices, resulting in a decrease in the capacity of the energy storage device and a low power amount per unit space in the energy storage device.

[0076] Moreover, the water cooling unit or the air cooling unit usually also needs to perform heat exchange with the external environment outside the cabinet, which requires corresponding through holes, through slots and other structures to be provided on the cabinet so that the water cooling unit or the air cooling unit can extend outside the cabinet. And the through holes, through slots and other structures are also likely to cause dust, water or other impurities in the external environment to enter the cabinet, and easily increase the risk of damage to the battery devices.

[0077] Based on the above considerations, in order to reduce the occupancy of the internal space of the cabinet by the temperature control structure in the energy storage device, an embodiment of the present application provides an energy storage device. A heat exchange structure is arranged in the cabinet, and the heat exchange structure includes a bearing part and a heat dissipation part. The bearing part bears the battery device and exchanges heat with the battery device, and the heat dissipation part is connected to the cabinet and exchanges heat with the cabinet, so as to transfer the heat on the battery device to the cabinet through the bearing part and the heat dissipation part, and the cabinet can exchange heat with the external environment to achieve the heat dissipation effect.

[0078] In such an energy storage device, the heat on the battery device is transferred to the cabinet through the heat exchange structure, and the cabinet can be cooled by exchanging heat with the external environment, thereby realizing the cooling of the battery device; at the same time, due to the large surface area of the cabinet, the heat exchange area between the cabinet and the external environment is also large, and the efficiency and effect of heat exchange are better; by using the heat exchange structure and cooperating with the heat exchange between the cabinet and the external environment to dissipate heat, the space occupied by the water cooling unit or the air cooling unit is saved, so as to facilitate the installation of more battery devices in the cabinet, improve the space utilization rate inside the cabinet, increase the capacity of the energy storage device, and increase the amount of electricity per unit space in the energy storage device.

[0079] The energy storage device disclosed in the embodiment of the present application can be used in the industrial field, such as for load balancing and reducing peak-valley differences; it can also be used in commercial complexes to achieve peak shaving, valley filling and intelligent management of electricity, etc.

[0080] For the convenience of description in the following embodiments, a container-type energy storage device 100 in an embodiment of the present application is taken as an example for description.

[0081] Refer to Figure 1 , an embodiment of the present application provides an energy storage device 100, which includes one or more battery clusters (BatteryCluster) to increase the voltage and capacity of the energy storage device 100. The battery cluster may include a plurality of battery devices 20, and the plurality of battery devices 20 are connected in series through a busbar component to increase the voltage of the energy storage device 100. When the energy storage device 100 includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to increase the capacity of the energy storage device 100.

[0082] The energy storage device 100 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems, etc. The energy storage device 100 can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device 100 can store electrical energy during low electricity consumption periods, and provide electrical energy to relevant users or electrical equipment during high electricity consumption periods. The energy storage system provided by the embodiment of the present application can be any power system that requires the use of the energy storage device 100.

[0083] In some embodiments, the energy storage device 100 is an energy storage container or an energy storage electric cabinet.

[0084] In some embodiments, the energy storage device 100 may include a cabinet 10 and one or more battery clusters, and the battery clusters are accommodated in the cabinet 10.

[0085] In some embodiments, the energy storage device 100 may include modules such as a thermal management module, a main control module, a total control module, a power distribution module, and a fire protection module.

[0086] As an example, the thermal management module may include a liquid cooling unit, and the liquid cooling unit provides a coolant for adjusting the temperature of the battery cells 22 to each battery device 20 through pipelines.

[0087] As an example, the main control module may serve as the battery management unit of the battery cluster for monitoring and managing the battery cluster. The main control module may monitor information such as the current, voltage, power, or temperature of the battery cluster. For example, it can control the charge and discharge current, voltage, etc. of the battery cluster. The main control module includes an auxiliary battery management unit SBMU (Slave Battery Management Unit, SBMU), a fusion switch and other modules.

[0088] As an example, the total control module may serve as the battery management unit of the energy storage device 100 for monitoring and managing the energy storage device 100. The total control module may monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device 100. For example, it can control the charge and discharge current, voltage, etc. of the energy storage device 100. As an example, the total control module includes an insulation monitoring module IMM (Insulation Monitoring Module, abbreviated as IMM), a main battery management unit MBMU (Master Battery Management Unit, MBMU), an Ethernet ETH (EtherNet, ETH), and a fiber optic conversion module and other modules.

[0089] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., and is used for detecting, alarming, or extinguishing fires in the energy storage system.

[0090] As an example, the power distribution module can be used to distribute power to the modules in the energy storage device 100 that need electricity.

[0091] Reference Figure 1 to Figure 3, in a first aspect, an embodiment of the present application provides an energy storage device 100, which includes a cabinet 10, a battery device 20, and a heat exchange structure 30. Among them, the cabinet 10 has an accommodation space 101; the battery device 20 is accommodated in the accommodation space 101; the heat exchange structure 30 is accommodated in the cabinet 10, and the heat exchange structure 30 includes a bearing part 31 and a heat dissipation part 32 connected to the bearing part 31. The bearing part 31 is used to bear the battery device 20 and exchange heat with the battery device 20, and the heat dissipation part 32 is attached to the cabinet 10.

[0092] The cabinet 10 refers to the structure in the energy storage device 100 that provides an installation foundation for the battery device 20 and other structures. The cabinet 10 can be used to accommodate the battery device 20 and other structures (such as a thermal management module, a main control module, etc.); the cabinet 10 can include a container, or can include other structures; the shape of the cabinet 10 can be prismatic, cylindrical, or other shapes.

[0093] The accommodation space 101 refers to the space in the cabinet 10 for accommodating the battery device 20 and other structures. The accommodation space 101 can be a closed space, or an open space with one or more openings 102 at one end or multiple ends; the accommodation space 101 can be a prismatic space, a cylindrical space, or a space of other shapes, and the shape of the accommodation space 101 can also be set according to the shape of the cabinet 10.

[0094] The battery device 20 refers to the device in the energy storage device 100 for storing and releasing electric energy. The number of battery devices 20 can be one, or two or more. The battery device 20 can include one or more battery cells 22. Multiple battery cells 22 can be connected in series, parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among multiple battery cells 22. Multiple battery cells 22 can be directly connected in series, parallel, or in a series-parallel combination together, and then the whole formed by multiple battery cells 22 is accommodated in a box body 21; of course, the battery device 20 can also be in the form that multiple battery cells 22 are first connected in series, parallel, or in a series-parallel combination to form battery modules, and then multiple battery modules are connected in series, parallel, or in a series-parallel combination to form a whole. The battery device 20 can also include other structures. For example, the battery device 20 can also include a busbar component for realizing the electrical connection among multiple battery cells 22.

[0095] Among them, each battery cell 22 can be a secondary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 22 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0096] The battery device 20 is accommodated in the accommodation space 101. A bracket can be set in the cabinet 10 to bear the battery device 20 through the bracket, or the battery device 20 can be directly connected to the cabinet 10 through an intermediate structure.

[0097] The heat exchange structure 30 refers to the structure of the energy storage device 100 for heat exchange with the battery device 20. The battery device 20 can perform heat exchange with the heat exchange structure 30 to control the temperature of the battery device 20. For example, when the temperature of the battery device 20 is relatively high, the battery device 20 can transfer some of its heat to the heat exchange structure 30 to lower the temperature of the battery device 20.

[0098] The heat exchange structure 30 can also perform heat exchange with the cabinet body 10 to transfer the heat on the battery device 20 to the cabinet body 10. The heat exchange structure 30 can include a plate-like structure, a columnar structure, or a structure of other shapes. The heat exchange structure 30 can also include a frame structure, etc. The material of the heat exchange structure 30 can include metal, plastic, or other materials.

[0099] The bearing part 31 refers to the structure in the heat exchange structure 30 for bearing the battery device 20. The battery device 20 can be connected to the bearing part 31. The battery device 20 can be connected to the bearing part 31 by welding, bonding, or other means. At this time, the bearing part 31 can provide support for the battery device 20 and can serve as the installation foundation of the battery device 20. The bearing part 31 can also perform heat exchange with the corresponding battery device 20. During the charging and discharging process of the battery device 20, the heat generated by the battery device 20 can be transferred to the bearing part 31.

[0100] The bearing part 31 can be a solid plate-like structure, a solid columnar structure, a solid frame structure, or other structures to perform heat exchange with the battery device 20 through the material characteristics of the bearing part 31 itself. The bearing part 31 can also be a hollow structure. At this time, a heat exchange medium (such as water, refrigerant, etc.) can be arranged inside the bearing part 31 to perform heat exchange with the battery device 20 jointly through the heat exchange medium and the material characteristics of the bearing part 31. The shape of the bearing part 31 can be circular, square, or other shapes. The material of the bearing part 31 can include metal, plastic, or other materials.

[0101] The heat dissipation part 32 refers to the part of the heat exchange structure 30 connected to the cabinet body 10. The heat dissipation part 32 can perform heat exchange with the cabinet body 10 to transfer the heat on the heat dissipation part 32 to the cabinet body 10. The heat dissipation part 32 can be attached to the cabinet body 10 by bonding, welding, or other means. The heat dissipation part 32 can also only abut or touch the cabinet body 10. The heat dissipation part 32 is also connected to the bearing part 31 so that the heat on the bearing part 31 can be transferred to the heat dissipation part 32, that is, the heat on the battery device 20 can be transferred to the cabinet body 10 through the bearing part 31 and the heat dissipation part 32, and the cabinet body 10 can perform heat exchange with the external environment. The bearing part 31 can be connected by welding, bonding, or other means. The bearing part 31 and the heat dissipation part 32 can also be integrally formed.

[0102] The heat dissipation part 32 can be a solid plate-like structure, a solid columnar structure, a solid frame structure or other structures, so as to conduct heat exchange with the battery device 20 through the material characteristics of the heat dissipation part 32 itself; the heat dissipation part 32 can also be a hollow structure. At this time, a heat exchange medium (such as water, refrigerant, etc.) can be arranged inside the heat dissipation part 32, so as to conduct heat exchange with the battery device 20 through the heat exchange medium and the material characteristics of the heat dissipation part 32. The shape of the heat dissipation part 32 can be circular, square or other shapes; the material of the heat dissipation part 32 can include metal, plastic or other materials.

[0103] It can be understood that since the heat dissipation part 32 is connected to the cabinet body 10 and the bearing part 31 is connected to the battery device 20, the heat exchange structure 30 can not only transfer the heat of the battery device 20 to the cabinet body 10, but also be used to bear the battery device 20; at this time, other structures for supporting or bearing the battery device 20 may not be arranged inside the cabinet body 10.

[0104] When the heat exchange structure 30 is arranged in the energy storage device 100, the battery device 20 can transfer heat to the cabinet body 10 through the heat exchange structure 30 and conduct heat exchange with the external environment through the cabinet body 10; at this time, a water cooling unit or an air cooling unit may no longer be arranged inside the cabinet body 10, so that more space can be saved inside the cabinet body 10 to facilitate accommodating more battery devices 20, improving the utilization rate of the electric quantity per unit space and the accommodating space 101 in the energy storage device 100; meanwhile, no longer arranging a water cooling unit or an air cooling unit inside the energy storage device 100 can also greatly reduce the self-energy consumption of the energy storage device 100, thereby improving the round-trip efficiency (RTE) of the energy storage device 100.

[0105] In this embodiment, the heat exchange structure 30 is arranged to transfer the heat on the battery device 20 to the cabinet body 10 through the heat exchange structure 30, and the cabinet body 10 can be cooled by conducting heat exchange with the external environment, so as to realize the cooling of the battery device 20; by dissipating heat through the heat exchange structure 30 and in cooperation with the heat exchange between the cabinet body 10 and the external environment, the space occupied by the water cooling unit or the air cooling unit is saved, so as to facilitate installing more battery devices 20 inside the cabinet body 10 and improve the space utilization rate inside the cabinet body 10.

[0106] Reference Figures 3 to 5 , in some embodiments, a flow channel 33 is arranged inside the heat exchange structure 30. The flow channel 33 extends from the bearing part 31 to the heat dissipation part 32, and a heat exchange medium is accommodated in the flow channel 33.

[0107] The flow channel 33 refers to the channel structure formed inside the heat exchange structure 30. The flow channel 33 can be a channel structure directly machined inside the heat exchange structure 30, or it can be a channel structure formed by pipes embedded in the heat exchange structure 30; the number of flow channels 33 can also be one, or two or more; the flow channel 33 can be a straight channel structure extending along a straight line, or a curved channel structure extending along a reference straight line. In a cross-section perpendicular to the flow channel 33, the cross-sectional shape of the flow channel 33 can be circular, square or other shapes.

[0108] According to the shape of the flow channel 33, the flow channel 33 can cover a certain side surface of the corresponding battery device 20, or the flow channel 33 can only cover a part of a certain side surface of the corresponding battery device 20; the flow channel 33 can be only provided in the bearing part 31 or the heat dissipation part 32, or the flow channel 33 can be partially located in the bearing part 31 and the other part located in the heat dissipation part 32.

[0109] The heat exchange medium is accommodated in the flow channel 33. The heat exchange medium can flow along the flow channel 33, and the heat exchange medium can exchange heat with the battery device 20; for example, the heat exchange structure 30 can exchange heat with the battery device 20, and the heat exchange medium can exchange heat with the heat exchange structure 30, that is, the heat exchange medium can indirectly exchange heat with the battery device 20 through the heat exchange structure 30.

[0110] The heat exchange medium can include liquid materials, solid materials (such as powders, etc.) or gaseous materials; the heat exchange medium can include water, or it can also include phase change materials, etc.

[0111] In this embodiment, a flow channel 33 is provided in the heat exchange structure 30, and a heat exchange medium is provided in the flow channel 33 to carry and transfer heat through the heat exchange medium, so as to better transfer the heat of the battery device 20 to the cabinet 10.

[0112] In some embodiments, the heat exchange medium is a phase change material.

[0113] A phase change material refers to a material that can change from one physical state to another physical state to absorb or release heat. During the process of the physical state change of the phase change material, the phase change material can flow autonomously in the flow channel 33.

[0114] For example, the phase change material can be a gas-liquid phase change material. The gas-liquid phase change material can change from a liquid state to a gaseous state and absorb heat during this process, or the gas-liquid phase change material can change from a gaseous state to a liquid state and release heat during this process; the gaseous phase change material carrying heat can flow to a position with a lower temperature and can push the liquid phase change material to a position with a higher temperature.

[0115] Exemplarily, the phase change material may also be a solid-liquid phase change material. The solid-liquid phase change material can change from a solid state to a liquid state and absorb heat during this process. The solid-liquid phase change material can also change from a liquid state to a solid state and release heat during this process. The liquid phase change material carrying heat can flow to a position with a lower temperature and can push the solid phase change material to a position with a higher temperature. It can be understood that the solid state of the solid-liquid phase change material can be granular, powdery or other solid states.

[0116] The phase change material may include tetrafluoroethane, difluoromethane, pentafluoroethane, etc.

[0117] When the heat exchange medium is a phase change material, the heat exchange medium can flow autonomously during the phase change process without being driven by an external driving device. Therefore, the flow channel 33 can be a closed space structure, and the flow channel 33 can be not connected at the head and tail.

[0118] Taking the example that the heat exchange medium can change between a liquid state and a gaseous state for illustration. When a part of the flow channel 33 is located in the bearing part 31 and another part is located in the heat dissipation part 32, in the part of the flow channel 33 located in the bearing part 31, the temperature of the battery device 20 is higher than the temperature of the heat exchange medium at the corresponding part. The heat exchange medium in this part of the flow channel 33 can absorb heat and change from a liquid state to a gaseous state to achieve heat exchange between the heat exchange medium and the battery device 20. Then, the gaseous part of the heat exchange medium can flow along the flow channel 33 from the inside of the bearing part 31 to the inside of the heat dissipation part 32. Then, in the part of the flow channel 33 located in the heat dissipation part 32, the temperature of the cabinet body 10 is lower than the temperature of the heat exchange medium at the corresponding part. The gaseous part of the heat exchange medium can release heat and change from a gaseous state to a liquid state to achieve heat exchange between the heat exchange medium and the cabinet body 10. Then, the liquid part of the heat exchange medium can flow into the bearing part 31 under the push of the gaseous part of the heat exchange medium. During this cyclic process, the cabinet body 10 can exchange heat with the external environment.

[0119] In this embodiment, the heat exchange medium is a phase change material, so that the phase change material can carry heat and flow autonomously in the flow channel 33 to better transfer the heat of the battery device 20 to the cabinet body 10. And this setting does not require a device for driving the heat exchange medium to flow in the heat exchange structure 30, thereby further reducing the space occupied by the heat exchange structure 30 and improving the utilization rate of the internal space of the cabinet body 10.

[0120] Reference Figures 3 to 5 , in some embodiments, the number of the flow channels 33 is at least two.

[0121] The number of the flow channels 33 is at least two, that is, the number of the flow channels 33 can be two, or can be three or more.

[0122] When the number of the flow channels 33 is two, the respective flow channels 33 can be located at different positions of the battery device 20 respectively to perform heat exchange with different parts of the battery device 20, so that the risks of local overheating and uneven heat distribution of the battery device 20 can be reduced.

[0123] When the number of the flow channels 33 is multiple, the respective flow channels 33 can be arranged in different directions; for example, a part of the respective flow channels 33 can be arranged in a plane parallel to the corresponding battery device 20, and at this time, the respective flow channels 33 can perform heat exchange with different positions of the corresponding battery device 20 respectively; for example, a part of the respective flow channels 33 can also perform heat exchange in a plane perpendicular to the corresponding battery device 20, and at this time, the distances between the respective flow channels 33 and the battery device 20 are different, and the heat exchange medium in the flow channel 33 adjacent to the battery device 20 can directly perform heat exchange with the battery device 20, and the heat exchange medium in the flow channel 33 farther from the battery device 20 can perform heat exchange with the heat exchange medium in the adjacent other flow channels 33.

[0124] In this embodiment, the number of the flow channels 33 is two so that the heat exchange medium can better transfer the heat of the battery device 20; meanwhile, the heat exchange media in different flow channels 33 can correspond to different positions of the battery device 20, so that the risks of local overheating and uneven heat distribution of the battery device 20 can be reduced.

[0125] Reference Figures 3 to 5 , in some embodiments, the flow channel 33 includes a first flow channel 331 and a second flow channel 332 communicated with the first flow channel 331. The first flow channel 331 is arranged in the bearing part 31, and the second flow channel 332 is arranged in the heat dissipation part 32.

[0126] The first flow channel 331 refers to the part of the flow channel 33 located in the bearing part 31, and the heat exchange medium in the first flow channel 331 can perform heat exchange with the battery device 20; the first flow channel 331 can be a channel structure formed in the bearing part 31, or can be a channel structure formed by a pipeline embedded in the bearing part 31; the first flow channel 331 can be a linear channel structure extending along a straight line, or can be a bent channel structure extending along a reference straight line. In a cross section perpendicular to the first flow channel 331, the cross-sectional shape of the first flow channel 331 can be circular, square or other shapes.

[0127] The second flow channel 332 refers to the part of the flow channel 33 located in the heat dissipation part 32. The heat exchange medium in the second flow channel 332 can exchange heat with the cabinet body 10; the second flow channel 332 can be a channel structure formed in the heat dissipation part 32, or can be a channel structure formed by pipes embedded in the heat dissipation part 32; the second flow channel 332 can be a straight channel structure extending along a straight line, or can be a curved channel structure extending along a reference straight line. In a cross-section perpendicular to the second flow channel 332, the cross-sectional shape of the second flow channel 332 can be circular, square or other shapes.

[0128] The first flow channel 331 is connected to the second flow channel 332 so that the heat exchange medium can flow back and forth in the first flow channel 331 and the second flow channel 332, and transfer heat accordingly.

[0129] When the heat exchange medium is a gas-liquid phase change material, the heat exchange medium in the first flow channel 331 can absorb heat and be converted from a liquid state to a gaseous state. Then, the gaseous heat exchange medium in the first flow channel 331 can autonomously flow into the second flow channel 332; the heat exchange medium in the second flow channel 332 can dissipate heat and be converted from a gaseous state to a liquid state. Then, the liquid heat exchange medium in the second flow channel 332 can enter the first flow channel 331, thereby realizing the transfer of heat.

[0130] This embodiment provides some specific structures of the flow channel 33, so that the heat exchange medium can exchange heat with the battery device 20 in the first flow channel 331, and the heat exchange medium can exchange heat with the cabinet body 10 in the second flow channel 332, so that the heat exchange medium can better transfer the heat of the battery device 20 to the cabinet body 10.

[0131] In some embodiments, the inner diameter of the first flow channel 331 is less than or equal to 1 mm (millimeter) so that the heat exchange medium can flow along the first flow channel 331 under the action of its own surface tension.

[0132] The inner diameter of the first flow channel 331 is proportional to the cross-sectional area of the first flow channel 331. The smaller the inner diameter of the first flow channel 331, the smaller the cross-sectional area of the first flow channel 331; and when the inner diameter of the first flow channel 331 is less than or equal to 1 mm, the heat exchange medium can form a capillary effect under the action of its own surface tension, that is, the heat exchange medium can flow and fill the first flow channel 331. For example, the inner diameter of the first flow channel 331 can be 1 mm, 0.7 mm, 0.5 mm, 0.3 mm or other values.

[0133] After the liquid part of the heat exchange medium flows from the second flow channel 332 to the first flow channel 331, since the inner diameter of the first flow channel 331 is less than or equal to 1 mm, the heat exchange medium can flow to the end of the first flow channel 331 far from the second flow channel 332 under the action of its own tension and fill the first flow channel 331. At this time, the heat exchange medium can exchange heat with different parts of the battery device 20 within the flow path defined by the first flow channel 331, so that the heat exchange structure 30 can transfer the heat on the battery device 20 more comprehensively, reduce the blind area in the heat exchange process, improve the uniformity and consistency of heat exchange, and reduce the risk of local overheating.

[0134] It can be understood that only the inner diameter of the first flow channel 331 can be less than or equal to 1 mm, or the inner diameters of both the first flow channel 331 and the second flow channel 332 can be less than or equal to 1 mm; in the case where the inner diameters of both the first flow channel 331 and the second flow channel 332 are less than or equal to 1 mm, the inner diameters of the first flow channel 331 and the second flow channel 332 can be equal or unequal.

[0135] Exemplarily, the inner diameter of the first flow channel 331 can be 1 mm. At this time, the heat exchange medium can flow along the first flow channel 331 under the action of its own tension and fill the first flow channel 331. At the same time, the amount of the heat exchange medium in the first flow channel 331 is relatively large, and the heat exchange medium can better exchange heat with the corresponding parts of the corresponding battery device 20.

[0136] Exemplarily, the inner diameter of the first flow channel 331 can be 0.5 mm. At this time, the heat exchange medium can fill the first flow channel 331 faster under the action of its own tension, so as to better improve the uniformity and consistency of heat exchange.

[0137] In this embodiment, the inner diameter of the first flow channel 331 is made less than or equal to 1 mm, so that the heat exchange medium can flow to various positions of the first flow channel 331 under the action of its own tension, so that the heat exchange medium can exchange heat with different positions of the corresponding battery device 20 at different positions of the first flow channel 331, so that the heat exchange structure 30 can transfer the heat on the battery device 20 more comprehensively, reduce the blind area in the heat exchange process, improve the uniformity and consistency of heat exchange, and reduce the risk of local overheating.

[0138] In some embodiments, the inner diameter of the flow channel 33 is less than or equal to 1 mm.

[0139] The inner diameter of the flow channel 33 is proportional to the cross-sectional area of the flow channel 33. The smaller the inner diameter of the flow channel 33, the smaller the cross-sectional area of the flow channel 33. When the inner diameter of the flow channel 33 is less than or equal to 1 mm, the heat exchange medium can form a capillary effect under the action of its own surface tension, that is, the heat exchange medium can flow and fill the flow channel 33. For example, the inner diameter of the flow channel 33 can be 1 mm, 0.7 mm, 0.5 mm, 0.3 mm or other values.

[0140] When the flow channel 33 includes a first flow channel 331 and a second flow channel 332, the inner diameters of the first flow channel 331 and the second flow channel 332 can be the same and both less than or equal to 1 mm to reduce the processing difficulty of the flow channel 33.

[0141] In the first flow channel 331, after the liquid part of the heat exchange medium flows from the second flow channel 332 to the first flow channel 331, because the inner diameter of the first flow channel 331 is less than or equal to 1 mm, the heat exchange medium can flow to the end of the first flow channel 331 away from the second flow channel 332 under the action of its own surface tension and fill the first flow channel 331. At this time, the heat exchange medium can perform heat exchange with different parts of the battery device 20 within the flow path defined by the first flow channel 331, so that the heat exchange structure 30 can transfer the heat on the battery device 20 more comprehensively, reduce the blind area in the heat exchange process, improve the uniformity and consistency of heat exchange, and reduce the risk of local overheating.

[0142] For example, the inner diameter of the flow channel 33 can be 1 mm. At this time, the heat exchange medium can flow along the flow channel 33 and fill the flow channel 33 under the action of its own surface tension. At the same time, the amount of the heat exchange medium in the flow channel 33 is large, and the heat exchange medium can better perform heat exchange with the corresponding part of the corresponding battery device 20.

[0143] For example, the inner diameter of the flow channel 33 can be 0.5 mm. At this time, the heat exchange medium can fill the flow channel 33 faster under the action of its own surface tension, so as to better improve the uniformity and consistency of heat exchange.

[0144] In this embodiment, the inner diameter of the flow channel 33 is made less than or equal to 1 mm, so that the heat exchange medium can flow to each position of the first flow channel 331 under the action of its own surface tension, so that the heat exchange medium can transfer the heat on the battery device 20 more comprehensively, reduce the blind area in the heat exchange process, improve the uniformity and consistency of heat exchange, and reduce the risk of local overheating. At the same time, this setting can also reduce the processing difficulty of the flow channel 33.

[0145] In some embodiments, the heat exchange structure 30 is a heat conducting structural member.

[0146] The heat exchange structure 30 is a heat-conducting structural member, that is, the material of the heat exchange structure 30 includes a heat-conducting material so that the heat exchange structure 30 can conduct heat. When the heat exchange structure 30 includes a bearing part 31 and a heat dissipation part 32, both the bearing part 31 and the heat dissipation part 32 can be heat-conducting structures, that is, the materials of the bearing part 31 and the heat dissipation part 32 can both include heat-conducting materials. At this time, the materials of the bearing part 31 and the heat dissipation part 32 can be the same or different.

[0147] The material of the heat exchange structure 30 can include metals, ceramics, plastics or other materials. For example, the material of the heat exchange structure 30 can include copper, aluminum, alumina, boron nitride, graphite, etc.

[0148] When the heat exchange structure 30 is a heat-conducting structural member, a flow channel 33 and a phase change material can be arranged inside the heat exchange structure 30. The heat exchange structure 30 can also be a solid structure without arranging the flow channel 33. When the heat exchange structure 30 is a solid structure without arranging the flow channel 33 inside, the heat of the battery device 20 can be conducted to the cabinet body 10 only through the heat conduction performance of the heat exchange structure 30 itself.

[0149] In this embodiment, the heat exchange structure 30 is made into a heat-conducting structural member so that the heat exchange structure 30 can transfer the heat on the battery device 20 to the cabinet body 10 better and more efficiently.

[0150] Reference Figure 2 、 Figure 6 In some embodiments, the heat dissipation part 32 and the bearing part 31 are arranged at an angle, and the heat dissipation part 32 is attached to the side wall of the cabinet body 10.

[0151] The bearing part 31 and the heat dissipation part 32 are arranged at an angle. The angle between the bearing part 31 and the heat dissipation part 32 can be 90°, that is, the bearing part 31 can be perpendicular to the heat dissipation part 32, and the angle between the bearing part 31 and the heat dissipation part 32 can also be other angles.

[0152] To improve the heat exchange efficiency between the battery device 20 and the bearing part 31, the wall surface with the largest surface area of the battery device 20 can be made to correspond to and be connected to the bearing part 31, and the side wall of the cabinet body 10 corresponding to the heat dissipation part 32 of this surface of the battery device 20 may not be in the same plane. Accordingly, the bearing part 31 and the heat dissipation part 32 are arranged at an angle so that the surface with a larger area in the bearing part 31 can correspond to and be connected to the battery device 20, and at the same time, the surface with a larger area in the heat dissipation part 32 can correspond to and be connected to the side wall of the cabinet body 10, thereby improving the heat conduction efficiency of the heat exchange structure 30.

[0153] This embodiment provides specific structures of some heat exchange structures 30, so that the bearing part 31 can better and more comprehensively correspond to the corresponding wall surface of the battery device 20, and can better and more comprehensively perform heat exchange with the corresponding side of the corresponding battery device 20, thereby improving the uniformity and consistency of the heat exchange between the heat exchange structure 30 and the battery device 20; at the same time, it is also convenient to fit the heat dissipation part 32 to the cabinet body 10, so that the heat dissipation part 32 can better transfer heat to the cabinet body 10.

[0154] In some embodiments, the bearing part 31 is a plate-like structure, that is, the bearing part 31 has two relatively arranged and larger surfaces, while the other surfaces of the bearing part 31 are smaller; the heat dissipation part 32 is also a plate-like structure, that is, the heat dissipation part 32 has two relatively arranged and larger surfaces, while the other surfaces of the heat dissipation part 32 are smaller.

[0155] The bearing part 31 is parallel to the wall surface of the corresponding battery device 20. According to the corresponding structure of the battery device 20, the wall surface of the battery device 20 opposite to the bearing part 31 can be a plane, and other structures can also be provided on this wall surface. At this time, the battery device 20 is substantially parallel to this wall surface; in this setting, the larger surface of the bearing part 31 is connected to the wall surface of the corresponding battery device 20, so that there is a larger heat exchange area between the bearing part 31 and the corresponding battery device 20, thereby improving the heat exchange efficiency between the bearing part 31 and the corresponding battery device 20.

[0156] The heat dissipation part 32 is parallel to the corresponding side wall of the cabinet body 10. At this time, the larger surface of the heat dissipation part 32 is connected to the cabinet body 10, so that there is a larger heat exchange area between the heat dissipation part 32 and the corresponding side wall of the cabinet body 10, thereby improving the heat exchange efficiency between the heat dissipation part 32 and the corresponding side wall of the cabinet body 10.

[0157] Reference Figure 2 、 Figure 6 In some embodiments, a first heat conducting layer 40 is provided between the heat dissipation part 32 and the cabinet body 10. One side of the first heat conducting layer 40 is connected to the heat dissipation part 32 and the other side is connected to the cabinet body 10.

[0158] The first heat conducting layer 40 refers to the structure in the energy storage device 100 for conducting the heat of the heat dissipation part 32 to the cabinet body 10. The heat dissipation part 32 can better conduct heat to the cabinet body 10 through the first heat conducting layer 40; the first heat conducting layer 40 can be a coating structure coated on the cabinet body 10 or the heat dissipation part 32, and the first heat conducting layer 40 can also be an independent structure and connected to the heat dissipation part 32 and the cabinet body 10.

[0159] One side of the first heat conduction layer 40 is connected to the heat dissipation part 32, and the other side of the first heat conduction layer 40 is connected to the cabinet body 10, that is, the heat dissipation part 32 can be connected to the cabinet body 10 through the first heat conduction layer 40; at this time, in addition to conducting heat, the first heat conduction layer 40 is also used to fix the heat dissipation part 32. Accordingly, the first heat conduction layer 40 can include epoxy resin thermal conductive adhesive, silicone thermal conductive adhesive, polyurethane thermal conductive adhesive, etc.

[0160] Affected by processing technology, installation technology, etc., there are easily micro holes or unevenness on the surfaces of the heat dissipation part 32 and the cabinet body 10, so that air easily enters between the contact surfaces of the heat dissipation part 32 and the cabinet body 10 and forms multiple small or micro cavities. Due to the presence of air, the thermal conductivity of these cavities is poor, which easily has a negative impact on the heat conduction between the heat dissipation part 32 and the cabinet body 10; at the same time, these microstructures also easily have a negative impact on the connection stability between the heat dissipation part 32 and the cabinet body 10.

[0161] Accordingly, a first heat conduction layer 40 is provided between the heat dissipation part 32 and the cabinet body 10 to fill the possible holes or cavities through the first heat conduction layer 40 and conduct heat through the first heat conduction layer 40 to improve the heat exchange efficiency between the heat dissipation part 32 and the cabinet body 10; at the same time, the first heat conduction layer 40 can also improve the connection stability between the heat dissipation part 32 and the cabinet body 10.

[0162] In this embodiment, a first heat conduction layer 40 is provided, and the heat dissipation part 32 is connected to the cabinet body 10 through the first heat conduction layer 40, so that the heat dissipation part 32 can exchange heat with the cabinet body 10 better and more efficiently, and the structural stability is improved.

[0163] Reference Figure 7 、 Figure 8 , in some embodiments, the battery device 20 includes a box body 21 and battery cells 22 accommodated in the box body 21; at least part of the bearing part 31 is accommodated in the box body 21 and is used to bear the battery cells 22, and the heat dissipation part 32 is located outside the box body 21.

[0164] The box body 21 refers to the structure in the battery device 20 that provides an accommodation space 101 for the battery cells 22; the shape of the box body 21 can be cylindrical, multi-prismatic or other shapes; the material of the box body 21 can include metal, plastic or other materials.

[0165] The box body 21 can adopt various structures. For example, the box body 21 can include a first part and a second part, the first part and the second part cover each other, and the first part and the second part jointly define an accommodation space 101 for accommodating the battery cell 22; the second part can be a hollow structure with an opening 102 at one end, and the first part can be a plate-like structure, and the first part covers the opening 102 side of the second part so that the first part and the second part jointly define the accommodation space 101; the first part and the second part can also both be hollow structures with an opening 102 on one side, and the opening 102 side of the first part covers the opening 102 side of the second part.

[0166] The battery cell 22 refers to the smallest unit that makes up the battery. In the battery device 20, the number of battery cells 22 can be one, or two or more; multiple battery cells 22 can be connected in series, parallel or in a mixed connection. A mixed connection means that there are both series and parallel connections among multiple battery cells 22. Multiple battery cells 22 can be directly connected in series, parallel or in a mixed connection together, and then the whole formed by multiple battery cells 22 is accommodated in the box body 21; the battery can also be that multiple battery cells 22 are first connected in series, parallel or in a mixed connection to form a battery cell assembly, and multiple battery cell assemblies are then connected in series, parallel or in a mixed connection to form a whole and are accommodated in the box body 21. The battery device 20 can also include other structures. For example, the battery device 20 can also include a busbar component for realizing the electrical connection among multiple battery cells 22.

[0167] At least part of the bearing part 31 is accommodated in the box body 21, that is, the bearing part 31 can be only partially located in the box body 21, or the whole bearing part 31 can be located in the box body 21; the bearing part 31 is used to bear the battery cell 22, and the battery cell 22 can be connected to the bearing part 31 by bonding, welding, clamping or other means so that the battery cell 22 can exchange heat with the bearing part 31 and the bearing part 31 can provide support and an installation base for the battery cell 22.

[0168] Since the battery cell 22 is the structure for releasing and storing electrical energy in the battery device 20 and is the main source of the heat generated by the battery device 20; therefore, at least part of the bearing part 31 is accommodated in the box body 21 and connected to the battery cell 22 so that the heat on the battery cell 22 can be directly conducted to the bearing part 31, thereby enabling the bearing part 31 to conduct the heat generated by the battery device 20 more efficiently.

[0169] The heat dissipation part 32 is located outside the box body 21 so that the heat dissipation part 32 can be connected to the cabinet body 10 and conduct heat to the cabinet body 10; since at least part of the bearing part 31 is located inside the box body 21, part of the bearing part 31 can extend outside the box body 21 and be connected to the heat dissipation part 32, or an intermediate structure can be arranged between the bearing part 31 and the heat dissipation part 32. At this time, one end of the intermediate structure can extend into the box body 21 and be connected to the bearing part 31, and the other end of the intermediate structure is connected to the heat dissipation part 32, so that the bearing part 31 can conduct heat to the heat dissipation part 32 through the intermediate structure member.

[0170] This embodiment provides some specific structures of the battery device 20, so that at least part of the heat dissipation part 32 is located inside the box body 21, so that the bearing part 31 can be in direct contact with the battery cell 22, thereby further improving the heat exchange efficiency of the bearing part 31.

[0171] Reference Figure 7 、 Figure 8 , in some embodiments where the bearing part 31 is located inside the box body 21, the battery cell 22 includes a housing 221, the housing 221 includes a first surface 2211 and a plurality of second surfaces 2212 different from the first surface 2211, and electrode terminals 222 are provided on the first surface 2211; at least one of the plurality of second surfaces 2212 is arranged to perform heat exchange with the bearing part 31.

[0172] The housing 221 refers to the component in the battery cell 22 for forming the internal environment, and structures such as the electrode assembly and electrolyte of the battery cell 22 can be accommodated in the housing 221; the housing 221 can be a cylindrical structure, a prismatic structure or other shaped structures; the material of the housing 221 can include metals, plastics or other materials; when the battery cell 22 is connected to the bearing part 31, the housing 221 is connected to the bearing part 31.

[0173] The electrode terminal 222 refers to the structure in the battery cell 22 for inputting and outputting electric energy. The electrode terminal 222 is connected to the housing 221. One end of the electrode terminal 222 can extend into the housing 221 to be connected to the electrode assembly, and the other end of the electrode terminal 222 can extend outside the housing 221 for facilitating the output or input of electric energy.

[0174] The first surface 2211 and the second surfaces 2212 are respectively different surfaces of the housing 221. The electrode terminals 222 are provided on the first surface 2211, while the bearing part 31 is used for heat exchange with the second surfaces 2212, that is, the bearing part 31 and the electrode terminals 222 are respectively located on different surfaces of the housing 221; the bearing part 31 can perform heat exchange with the second surfaces 2212. The bearing part 31 can be connected to the second surfaces 2212 by welding, bonding or other means, and the bearing part 31 can also only abut or touch the second surfaces 2212.

[0175] There are multiple second surfaces 2212, that is, the number of second surfaces 2212 can be two, or three or more. One of the multiple second surfaces 2212 can be opposite to the first surface 2211, and another or several of the multiple second surfaces 2212 can be adjacent to the first surface 2211. The bearing part 31 exchanges heat with at least one of the multiple second surfaces 2212. According to the shape of the bearing part 31, the bearing part 31 can exchange heat with only one second surface 2212, or can exchange heat with two or more second surfaces 2212.

[0176] Since the electrode terminal 222 is used for inputting and outputting electric energy, that is, a bus bar component or other conductive component needs to be connected to the end of the electrode terminal 222 facing outside the housing 221. These structures will protrude from the first surface 2211, thus having a negative impact on the contact area between the bearing part 31 and the housing 221. Accordingly, the bearing part 31 is connected to the second surface 2212 so that a larger contact area can be provided between the bearing part 31 and the housing 221, thereby improving the heat exchange efficiency between the battery cell 22 and the bearing part 31.

[0177] This embodiment provides some structures of the battery cells 22, such that the bearing part 31 and the electrode terminal 222 are respectively located on different surfaces of the housing 221, so as to reduce the negative impact of the electrode terminal 222 on the connection area between the bearing part 31 and the housing 221, and enable the bearing part 31 to better fit with the housing 221, so that the bearing part 31 can better exchange heat with the battery cell 22.

[0178] Reference Figure 7 、 Figure 8 , in some embodiments, along the height direction of the cabinet body 10, the electrode terminal 222 is located above the housing 221, and the bearing part 31 is located below the housing 221.

[0179] The electrode terminal 222 is located above the housing 221 along the height direction of the cabinet body 10, while the bearing part 31 is located below the housing 221 along the height direction of the cabinet body 10. At this time, the bearing part 31 can not only exchange heat with the battery cell 22, but also be used to support the battery cell 22 to provide a support and installation foundation for the battery cell 22.

[0180] At this time, the bearing part 31 is located on the side of the battery cell 22 without the electrode terminal 222, so as to reduce the interference of the electrode terminal 222 on the connection of the bearing part 31 to the battery cell 22, and enable a larger contact area between the bearing part 31 and the battery cell 22, so that the battery cell 22 can more efficiently exchange heat with the bearing part 31, and at the same time, the connection stability between the battery cell 22 and the bearing part 31 can also be improved.

[0181] This embodiment further provides some relative positions of the bearing part 31 and the battery cell 22, so that the bearing part 31 can not only perform heat exchange with the battery cell 22, but also provide support for the battery cell 22.

[0182] Reference Figure 7 , Figure 8 , in some embodiments, a second heat-conducting layer 50 is provided between the battery cell 22 and the bearing part 31. One side of the second heat-conducting layer 50 is connected to the battery cell 22 and the other side is connected to the bearing part 31.

[0183] The second heat-conducting layer 50 refers to a structure in the energy storage device 100 for conducting the heat of the battery cell 22 to the bearing part 31. The battery cell 22 can better conduct heat to the bearing part 31 through the second heat-conducting layer 50; the second heat-conducting layer 50 can be a coating structure coated on the battery cell 22 or the bearing part 31, and the second heat-conducting layer 50 can also be an independent structure and connected to the battery cell 22 and the bearing part 31.

[0184] One side of the second heat-conducting layer 50 is connected to the battery cell 22, and the other side of the second heat-conducting layer 50 is connected to the bearing part 31, that is, the battery cell 22 can be connected to the bearing part 31 through the second heat-conducting layer 50; at this time, in addition to conducting heat, the second heat-conducting layer 50 is also used to fix the battery cell 22 so that the battery cell 22 can be stably connected to the bearing part 31. Accordingly, the second heat-conducting layer 50 can include epoxy resin heat-conducting glue, silicone heat-conducting glue, polyurethane heat-conducting glue, etc.

[0185] Affected by processing technology, installation technology, etc., there are easily micro holes or unevenness on the surface of the housing 221 of the battery cell 22 and the bearing part 31, resulting in air being easily introduced between the contact surfaces of the battery cell 22 and the bearing part 31 to form a plurality of small or micro cavities. Due to the presence of air, the thermal conductivity of these cavities is poor, which is likely to have a negative impact on the heat conduction between the battery cell 22 and the bearing part 31; at the same time, these microstructures are also likely to have a negative impact on the connection stability between the battery cell 22 and the bearing part 31.

[0186] Accordingly, a second heat-conducting layer 50 is provided between the battery cell 22 and the bearing part 31 to fill the possible holes or cavities through the second heat-conducting layer 50 and conduct heat through the second heat-conducting layer 50 to improve the heat exchange efficiency between the battery cell 22 and the bearing part 31; at the same time, the second heat-conducting layer 50 can also improve the connection stability between the battery cell 22 and the bearing part 31.

[0187] In this embodiment, a second heat conduction layer 50 is provided, and the battery cell 22 is connected to the bearing part 31 through the second heat conduction layer 50, so that the battery cell 22 can exchange heat with the bearing part 31 better and more efficiently, and at the same time, the battery cell 22 can be more stably connected to the bearing part 31, improving the structural stability.

[0188] In some other embodiments, when the bearing part 31 is outside the box body 21 of the battery device 20, the box body 21 can be connected to the bearing part 31 through the second heat conduction layer 50.

[0189] Reference Figure 1 、 Figure 2 In some embodiments, the cabinet body 10 is a standard container cabinet body. Along the height direction Z of the cabinet body 10, a plurality of battery devices 20 are stacked, and the heat dissipation part 32 is located at the first end 103 along the width direction Y of the cabinet body 10.

[0190] The standard container cabinet body refers to a container cabinet body whose specifications, materials, etc. conform to the unified specifications formulated by the International Organization for Standardization (ISO) and are used for global cargo transportation; the cabinet body 10 is a standard container cabinet body, so that the energy storage device 100 can be efficiently transferred between different transportation modes (such as ships, railways, trucks), and at the same time, it can also adapt to various transfer equipment.

[0191] For example, the cabinet body 10 can be a 20-foot container cabinet body. At this time, the length of the cabinet body 10 can be 6.1 m, the width can be 2.44 m, and the height can also be 2.59 m; for example, the cabinet body 10 can be a 40-foot container cabinet body. At this time, the length of the cabinet body 10 can be 12.2 m, the width can be 2.44 m, and the height can also be 2.59 m; the cabinet body 10 can also be a standard container cabinet body of other sizes.

[0192] The first end 103 of the cabinet body 10 along its width direction Y refers to one of the two ends in the width direction of the cabinet body 10.

[0193] The battery devices 20 are stacked along the height direction Z of the cabinet body 10, so that more battery devices 20 can be accommodated in the cabinet body 10, and one end of each battery device 20 faces the first end 103; the heat dissipation part 32 is located at the first end 103 of the cabinet body 10 along its width direction Y, so that each heat dissipation part 32 can be attached to the cabinet body 10.

[0194] This embodiment provides some arrangement methods of the battery devices 20 in the cabinet body 10, so that the heat dissipation parts 32 corresponding to the respective battery devices 20 can be attached to the cabinet body 10, so as to facilitate each heat exchange structure 30 to transfer the heat of the corresponding battery device 20 to the cabinet body 10.

[0195] Reference Figure 1 、Figure 2 In some embodiments, the energy storage device 100 further includes a heat dissipation structure 11, which is correspondingly arranged with the heat dissipation part 32 and is disposed outside the first end 103 along the width direction of the cabinet body 10.

[0196] The cabinet body 10 is provided with a heat dissipation structure 11. The heat dissipation structure 11 may include structures such as fins or devices such as evaporators. According to the specific structure of the heat dissipation structure 11, the heat dissipation structure 11 can be connected to the cabinet body 10 by welding, screwing or other means, or the heat dissipation structure 11 can also be integrally formed with the cabinet body 10. The heat dissipation structure 11 is located outside the cabinet body 10 to facilitate better heat exchange between the cabinet body 10 and the external environment and dissipate heat. The setting of the heat dissipation structure 11 can improve the heat exchange efficiency between the cabinet body 10 and the external environment.

[0197] The heat dissipation structure 11 corresponds to the heat dissipation part 32, that is, the heat dissipation structure 11 and the heat dissipation part 32 are respectively located on opposite sides of the same side wall of the cabinet body 10. When the heat dissipation part 32 is located at the first end 103 of the cabinet body 10 along its width direction Y, the heat dissipation structure 11 is also located at the first end 103 of the cabinet body 10 along its width direction Y. This setting enables the heat conducted from the heat dissipation part 32 to the cabinet body 10 to be transferred to the heat dissipation structure 11 faster and dissipated to the external environment through the heat dissipation structure 11, thereby being able to better improve the heat dissipation efficiency of the cabinet body 10 and also being able to better improve the heat exchange efficiency between the heat dissipation part 32 and the cabinet body 10.

[0198] The heat dissipation structure 11 can be only disposed on the part of the cabinet body 10 corresponding to the heat dissipation part 32, and the heat dissipation structure 11 can also be disposed on other parts of the cabinet body 10 to further improve the heat exchange efficiency between the cabinet body 10 and the external environment and improve the heat dissipation efficiency of the cabinet body 10.

[0199] In this embodiment, a heat dissipation structure 11 is provided on the cabinet body 10 to improve the heat exchange efficiency between the cabinet body 10 and the external environment and enable the cabinet body 10 to dissipate heat better, thereby being able to better reduce the temperature of the battery device 20 and reduce the overall temperature of the energy storage device 100.

[0200] Reference Figure 1 、 Figure 2 In some embodiments, the heat dissipation structure 11 includes at least two sheet-like structural members connected to the cabinet body 10 and spaced apart.

[0201] The heat dissipation structure 11 includes at least two sheet-like structural members connected to the cabinet 10. The number of the sheet-like structural members can be two, or three or more; the sheet-like structural member can be a square sheet-like structure, a circular sheet-like structure or a sheet-like structural member of other shapes; the material of the sheet-like structural member can include metal, plastic or other materials; according to the material of the sheet-like structural member, the sheet-like structural member can be connected to the cabinet 10 by welding, bonding or other means, or the sheet-like structural member can be integrally formed with the cabinet 10.

[0202] At least two sheet-like structural members are arranged at intervals, that is, the airflow in the external environment can flow through the interval space between two adjacent sheet-like structural members to increase the heat exchange area between the sheet-like structural member and the external environment.

[0203] The heat dissipation structure 11 includes at least two sheet-like structural members. At this time, the heat dissipation structure 11 can increase the heat exchange area between the cabinet 10 and the external environment, and can improve the heat exchange efficiency between the cabinet 10 and the external environment, so as to better reduce the temperature of the cabinet 10, and further better reduce the temperature of the battery device 20.

[0204] When the heat dissipation structure 11 includes at least two sheet-like structural members, each sheet-like structural member can be only arranged at the part of the cabinet 10 corresponding to the heat dissipation part 32, or only a part of the sheet-like structural members can be connected to the part of the cabinet 10 corresponding to the heat dissipation part 32, and the other parts of the sheet-like structural members can be connected to other parts of the cabinet 10.

[0205] This embodiment provides some specific structures of the heat dissipation structure 11, so that the heat dissipation structure 11 can have a larger heat exchange area with the external environment, so as to better improve the heat dissipation ability of the cabinet 10, and better reduce the temperatures of the battery device 20 and the energy storage device 100.

[0206] Reference Figure 1 、 Figure 2 Referring to

[0207] The cabinet door 12 refers to the structure in the cabinet body 10 for closing the opening 102. The cabinet door 12 can be connected to the cabinet body 10 and cover the accommodation space 101. At this time, the accommodation space 101 is a space structure with an opening 102 on one side; when the cabinet door 12 covers the opening 102, the accommodation space 101 is a closed space separated from the external environment. The shape of the cabinet door 12 can be circular, square or other shapes; the cabinet door 12 can be detachably connected to the cabinet body 10 through structures such as bolts and buckles, and the cabinet door 12 can also be movably connected to the cabinet body 10 through structures such as slide rails and hinges; the material of the cabinet door 12 can include metals, plastics or other materials, and the material of the cabinet door 12 can be the same as or different from the material of the cabinet body 10.

[0208] When the cabinet door 12 covers the opening 102, the accommodation space 101 is a closed space and is separated from the external environment; since the heat of the battery device 20 is conducted to the cabinet body 10 by the heat exchange structure 30, and the cabinet body 10 can directly exchange heat with the external environment, the accommodation space 101 can dissipate the heat of the battery device 20 without being connected to the external environment. Accordingly, after the cabinet door 12 covers the cabinet body 10, external impurities (such as water, dust, etc.) are difficult to enter the accommodation space 101, thereby reducing the possible damage and interference of the external environment to the battery device 20.

[0209] The second end 104 of the cabinet body 10 along its width direction Y refers to the other end of the cabinet body 10 opposite to the first end 103, that is, the first end 103 and the second end 104 are respectively located on both sides of the cabinet body 10 along the width direction Y of the cabinet body 10.

[0210] The cabinet door 12 is provided at the second end 104 of the cabinet body 10 along its width direction Y. When the heat dissipation structure 11 is provided at the first end 103 of the cabinet body 10, the cabinet door 12 and the heat dissipation structure 11 are respectively located on opposite sides of the cabinet body 10 along its width direction Y. At this time, one side of each battery device 20 faces the cabinet door 12, and the other side of each battery device 20 opposite to the cabinet door 12 faces the first end 103 of the cabinet body 10. The heat dissipation part 32 is connected to the first end 103 of the cabinet body 10. The heat dissipation part 32 can be directly connected to the cabinet body 10 without making an avoidance design for other battery devices 20. This setting can also enable the bearing part 31 to be directly connected to the heat dissipation part 32, thereby shortening the heat conduction path between the bearing part 31 and the heat dissipation part 32, so that more heat on the bearing part 31 can be conducted to the heat dissipation part 32, reducing the heat dissipated into the accommodation space 101 during the heat conduction process and improving the heat conduction efficiency.

[0211] When the cabinet door 12 covers the opening 102, each battery device 20 can also be abutted against the cabinet door 12. At this time, part of the heat on each battery device 20 can also be conducted to the cabinet door 12 to further improve the heat dissipation efficiency of the energy storage device 100.

[0212] This embodiment provides some specific structures of the cabinet body 10, making the cabinet body 10 include a cabinet door 12 to facilitate the installation, maintenance, and replacement of the battery device 20; at the same time, after the cabinet door 12 is closed, it can also form a closed space to reduce the possible negative impacts of the external environment on the battery device 20 inside the cabinet body 10.

[0213] In some embodiments, the energy storage device 100 includes a cabinet body 10, a battery device 20, and a heat exchange structure 30.

[0214] The cabinet body 10 has an accommodation space 101 with an opening 102 at one end. The battery device 20 and the heat exchange structure 30 are both accommodated in the accommodation space 101. The cabinet door 12 is movably connected to the cabinet body 10 to cover or open the opening 102; when the cabinet door 12 covers the opening 102, the accommodation space 101 is a closed space and is separated from the external environment.

[0215] The cabinet door 12 is located at the second end portion 104 of the cabinet body 10. The cabinet body 10 is provided with a heat dissipation structure 11. The heat dissipation structure 11 includes a plurality of sheet-like structural members, and the heat dissipation structure 11 is connected to the outside of the first end portion 103 of the cabinet body 10.

[0216] The battery device 20 includes a box body 21 and battery cells 22 accommodated in the box body 21. The battery cells 22 include a housing 221 and electrode terminals 222 connected to the housing 221. The electrode terminals 222 are located above the housing 221.

[0217] The heat exchange structure 30 is provided corresponding to the battery device 20 one by one.

[0218] The heat exchange structure 30 includes a bearing portion 31 and a heat dissipation portion 32. A part of the bearing portion 31 is located inside the box body 21, and another part of the bearing portion 31 extends outside the box body 21 and is connected to the heat dissipation portion 32. The bearing portion 31 is connected to the battery cell 22 and is located below the battery cell 22; the battery cell 22 is connected to the bearing portion 31 through a second heat conduction layer 50.

[0219] The heat dissipation portion 32 is parallel to the side wall of the cabinet body 10 opposite to the cabinet door 12. The heat dissipation portion 32 is connected to the corresponding side wall of the cabinet body 10 through a first heat conduction layer 40. The heat dissipation portion 32 is located at the first end portion 103 of the cabinet body 10.

[0220] The heat exchange structure 30 is provided with a flow channel 33. The flow channel 33 includes a first flow channel 331 and a second flow channel 332. The first flow channel 331 is arranged in the bearing part 31 and corresponds to the battery cell 22, and the second flow channel 332 is arranged in the heat dissipation part 32 and corresponds to the corresponding side wall of the cabinet body 10. A heat exchange medium is arranged in the flow channel 33, and the heat exchange medium is a gas-liquid phase change material.

[0221] Reference Figure 8 Second, an embodiment of the present application further provides a battery device 20. The battery device 20 includes a box body 21 and battery cells 22 accommodated in the box body 21. The battery device 20 further includes a heat exchange structure 30. The heat exchange structure 30 includes a bearing part 31 and a heat dissipation part 32 connected to the bearing part 31. At least part of the bearing part 31 is accommodated in the box body 21 and is used for bearing the battery cells 22, and the heat dissipation part 32 is located outside the box body 21.

[0222] The box body 21 refers to the structure in the battery device 20 that provides an accommodation space 101 for the battery cells 22. The shape of the box body 21 can be cylindrical, polygonal prism-shaped or other shapes. The material of the box body 21 can include metal, plastic or other materials.

[0223] The battery cell 22 refers to the smallest unit that makes up the battery. In the battery device 20, the number of battery cells 22 can be one, or two or more. The multiple battery cells 22 can be connected in series, in parallel or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 22.

[0224] At least part of the bearing part 31 is accommodated in the box body 21, that is, the bearing part 31 can be only partially located in the box body 21, or the entire bearing part 31 can be located in the box body 21.

[0225] Since the battery cell 22 is the structure that releases and stores electric energy in the battery device 20, the battery cell 22 is the main source of the heat generated by the battery device 20. Therefore, at least part of the bearing part 31 is accommodated in the box body 21 and connected to the battery cell 22, so that the heat on the battery cell 22 can be directly conducted to the bearing part 31, thereby enabling the bearing part 31 to more efficiently conduct the heat generated by the battery device 20.

[0226] The heat dissipation part 32 is located outside the box body 21, so that the heat dissipation part 32 can transfer heat to the external environment or external structure outside the box body 21. Since at least part of the bearing part 31 is located in the box body 21, part of the bearing part 31 can be extended outside the box body 21 and connected to the heat dissipation part 32, or an intermediate structure can be arranged between the bearing part 31 and the heat dissipation part 32. At this time, one end of the intermediate structure can extend into the box body 21 and be connected to the bearing part 31, and the other end of the intermediate structure is connected to the heat dissipation part 32, so that the bearing part 31 can conduct heat to the heat dissipation part 32 through the intermediate structure member.

[0227] This embodiment provides some specific structures of the battery device 20, such that at least a part of the heat dissipation part 32 is located inside the box body 21, so that the bearing part 31 can directly contact the battery cell 22, thereby improving the heat exchange efficiency of the bearing part 31; the heat dissipation part 32 is located outside the box body 21, so that the heat exchange structure 30 can conduct the heat inside the box body 21 to the outside of the box body 21, facilitating better reduction of the temperature inside the box body 21.

[0228] Reference Figure 7 、 Figure 8 In some embodiments where the bearing part 31 is located inside the box body 21, the battery cell 22 includes a housing 221, the housing 221 includes a first surface 2211 and a plurality of second surfaces 2212 different from the first surface 2211, and electrode terminals 222 are provided on the first surface 2211; at least one of the plurality of second surfaces 2212 is configured to perform heat exchange with the bearing part 31.

[0229] The housing 221 refers to the component in the battery cell 22 for forming the internal environment, and structures such as the electrode assembly and electrolyte of the battery cell 22 can be accommodated inside the housing 221; the housing 221 can be a cylindrical structure, a prismatic structure or other shaped structures; the material of the housing 221 can include metal, plastic or other materials; when the battery cell 22 is connected to the bearing part 31, the housing 221 is connected to the bearing part 31.

[0230] The electrode terminals 222 refer to the structures in the battery cell 22 for inputting and outputting electric energy, the electrode terminals 222 are connected to the housing 221, one end of the electrode terminals 222 can extend inside the housing 221 to be connected to the electrode assembly, and the other end of the electrode terminals 222 can extend outside the housing 221 for outputting or inputting electric energy.

[0231] The first surface 2211 and the second surfaces 2212 are respectively different surfaces of the housing 221, the electrode terminals 222 are provided on the first surface 2211, and the bearing part 31 is used for heat exchange with the second surfaces 2212, that is, the bearing part 31 and the electrode terminals 222 are respectively located on different surfaces of the housing 221; the bearing part 31 can perform heat exchange with the second surfaces 2212, the bearing part 31 can be connected to the second surfaces 2212 by welding, bonding or other means, and the bearing part 31 can also only abut or touch the second surfaces 2212.

[0232] The number of the second surfaces 2212 is plural, that is, the number of the second surfaces 2212 can be two, or can be three or more. One of the plural second surfaces 2212 can be opposite to the first surface 2211, and another or several of the plural second surfaces 2212 can be adjacent to the first surface 2211. The bearing part 31 exchanges heat with at least one of the plural second surfaces 2212. According to the shape of the bearing part 31, the bearing part 31 can exchange heat with only one second surface 2212, or can exchange heat with two or more second surfaces 2212.

[0233] Since the electrode terminal 222 is used for inputting and outputting electric energy, that is, a bus bar component or other conductive components need to be connected to one end of the electrode terminal 222 facing outside the housing 221, and these structures will protrude from the first surface 2211, thus having a negative impact on the contact area between the bearing part 31 and the housing 221. Accordingly, the bearing part 31 is connected to the second surface 2212, so that a larger contact area can be provided between the bearing part 31 and the housing 221, thereby improving the heat exchange efficiency between the battery cell 22 and the bearing part 31.

[0234] This embodiment provides some structures of the battery cells 22, so that the bearing part 31 and the electrode terminal 222 are respectively located on different surfaces of the housing 221, to reduce the negative impact of the electrode terminal 222 on the connection area between the bearing part 31 and the housing 221, and enable the bearing part 31 to better fit with the housing 221, so that the bearing part 31 can better exchange heat with the battery cell 22.

[0235] Reference Figure 7 、 Figure 8 In some embodiments, along the height direction of the battery device 20, the electrode terminal 222 is located above the housing 221, and the bearing part 31 is located below the housing 221.

[0236] The electrode terminal 222 is located above the housing 221 along its height direction, while the bearing part 31 is located below the housing 221 along the height direction of the battery device 20. At this time, the bearing part 31 can not only exchange heat with the battery cell 22, but also be used to support the battery cell 22 to provide a support and installation basis for the battery cell 22.

[0237] At this time, the bearing part 31 is located on the side of the battery cell 22 without the electrode terminal 222, to reduce the interference of the electrode terminal 222 on the connection of the bearing part 31 to the battery cell 22, and enable a larger contact area between the bearing part 31 and the battery cell 22, so that the battery cell 22 can more efficiently exchange heat with the bearing part 31, and at the same time, the connection stability between the battery cell 22 and the bearing part 31 can also be improved.

[0238] This embodiment further provides some relative positions of the bearing part 31 and the battery cell 22, so that the bearing part 31 can not only exchange heat with the battery cell 22, but also provide support for the battery cell 22.

[0239] Reference Figure 9 Thirdly, an energy storage system is further provided in an embodiment of the present application, including the energy storage device 100 provided in some embodiments of the first aspect; the energy storage system further includes a power conversion device 200, and the power conversion device 200 is used for electrically connecting a power generation device and the energy storage device 100. The power conversion device 200 can be located inside the accommodation space 101 of the energy storage device 100 or arranged outside the accommodation space 101 of the energy storage device 100.

[0240] For example, the energy storage system may include one or more energy storage devices 100 and a power conversion device 200 (Power Converter System, abbreviated as PCS). The power conversion device 200 is used to connect between a power generation device 300 and the energy storage device 100. The power generation device 300 is used to generate electric energy, and the electric energy generated by the power generation device 300 can be stored in the energy storage device 100 through the power conversion device 200. As an example, the power generation device 300 may specifically be a solar panel, a hydraulic power generation device 300, a thermal power generation device 300, a wind power generation device 300, etc. Among them, the specific type of the power generation device 300 is not limited in this application.

[0241] Reference Figure 10 Fourthly, a charging network is further provided in an embodiment of the present application, including the energy storage device 100 provided in some embodiments of the first aspect, or the energy storage system provided in some embodiments of the third aspect; the charging network further includes a charging pile 400, and the energy storage device 100 is used to provide electric energy for the charging pile 400.

[0242] The charging pile 400 is electrically connected to the energy storage device 100, and the energy storage device 100 is used to provide electric energy for the charging pile 400. The charging pile 400 and the battery device 20 in the energy storage device 100 are electrically connected through a cable, and the battery device 20 can provide the electric energy stored by itself to the charging pile 400. The charging pile 400 has one or more connectors 500, and the connectors 500 are used to connect with an electrical device (such as a vehicle), so as to replenish energy to the electrical device.

[0243] The energy storage device 100 can be located inside the charging pile 400 (such as an integrated storage and charging machine), or outside the charging pile 400.

[0244] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy storage device, characterized in that, Comprising: A cabinet body having an accommodation space; A battery device accommodated in the accommodation space; A heat exchange structure accommodated in the cabinet body, the heat exchange structure including a bearing part and a heat dissipation part connected to the bearing part, the bearing part being used for bearing the battery device and performing heat exchange with the battery device, the heat dissipation part being attached to the cabinet body and capable of performing heat exchange with the cabinet body, and the cabinet body being capable of dissipating heat to the external environment.

2. The energy storage device according to claim 1, wherein, A flow channel is provided in the heat exchange structure, the flow channel extends from the bearing part to the heat dissipation part, and a heat exchange medium is accommodated in the flow channel.

3. The energy storage device according to claim 2, wherein The heat exchange medium is a phase change material.

4. The energy storage device according to claim 2, characterized in that, The inner diameter of the flow channel is less than or equal to 1 mm.

5. The energy storage device according to any one of claims 1-4, characterized in that, The heat exchange structure is a heat conducting structural member.

6. The energy storage device according to any one of claims 1-4, characterized in that, The heat dissipation part and the bearing part are arranged at an angle, and the heat dissipation part is attached to the side wall of the cabinet body.

7. The energy storage device according to any one of claims 1-4, characterized in that, A first heat conducting layer is provided between the heat dissipation part and the cabinet body, one side of the first heat conducting layer is connected to the heat dissipation part and the other side is connected to the cabinet body.

8. The energy storage device according to any one of claims 1-4, characterized in that The battery device includes a box body and battery cells accommodated in the box body; At least part of the bearing part is accommodated in the box body and is used for bearing the battery cells, and the heat dissipation part is located outside the box body.

9. The energy storage device according to claim 8, characterized in that, The battery cell includes a housing, the housing includes a first surface and a plurality of second surfaces different from the first surface, and electrode terminals are provided on the first surface; At least one of the plurality of second surfaces is arranged to perform heat exchange with the bearing part.

10. The energy storage device according to claim 9, characterized in that, Along the height direction of the cabinet body, the electrode terminals are located above the housing, and the bearing part is located below the housing.

11. The energy storage device according to claim 8, characterized in that, A second heat conducting layer is provided between the battery cell and the bearing part, one side of the second heat conducting layer is connected to the battery cell and the other side is connected to the bearing part.

12. The energy storage device according to any one of claims 1-4, characterized in that, The cabinet body is a standard container cabinet body, and along the height direction of the cabinet body, a plurality of the battery devices are stacked, and the heat dissipation part is located at a first end along the width direction of the cabinet body.

13. The energy storage device according to claim 12, wherein, It further includes a heat dissipation structure, the heat dissipation structure is correspondingly arranged with the heat dissipation part, and the heat dissipation structure is arranged outside a first end along the width direction of the cabinet body.

14. The energy storage device according to claim 13, wherein, The cabinet body includes a cabinet door, the cabinet door is arranged at a second end along the width direction of the cabinet body, and the cabinet door can close or open the accommodation space of the cabinet body.

15. A battery device, characterized in that, Comprising: A box body; Battery cells accommodated in the box body; A heat exchange structure including a bearing part and a heat dissipation part connected to the bearing part, at least part of the bearing part is accommodated in the box body and is used for bearing the battery cells, and the heat dissipation part is located outside the box body.

16. The battery device according to claim 15, wherein, The battery cell includes a housing, the housing includes a first surface and a plurality of second surfaces different from the first surface, and electrode terminals are provided on the first surface; At least one of the plurality of second surfaces is arranged to perform heat exchange with the bearing part.

17. The battery device according to claim 16, characterized in that, Along the height direction of the battery device, the electrode terminals are located above the housing, and the bearing part is located below the housing.

18. An energy storage system, characterized in that, Comprising a power conversion device and an energy storage device as described in any one of claims 1-14, the power conversion device being disposed inside the accommodation space of the energy storage device or outside the accommodation space of the energy storage device.

19. A charging network, characterized in that, Comprising an energy storage device as described in any one of claims 1-14; or an energy storage system as described in claim 18; and A charging pile, the energy storage device being used to supply electric energy to the charging pile.

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