Battery device, energy storage system and power utilization device

Abstract

The embodiment of the utility model discloses a battery device, an energy storage system and a power utilization device, and the battery device comprises a box body assembly which is provided with a containing cavity; the battery monomer assembly comprises a plurality of battery monomers, and the battery monomer assembly is accommodated in the accommodating cavity; the heat exchange assembly comprises a first wall and a second wall which are oppositely arranged, the first wall is attached to the battery monomer assembly, and the second wall is arranged on the side, away from the battery monomer assembly, of the first wall; the third wall is arranged on one side, far away from the battery monomer assembly, of the second wall, a thermal insulation layer is formed between the third wall and the second wall, and inert gas is contained in the thermal insulation layer; wherein one side, far away from the battery monomer assembly, of the third wall is in contact with the outside of the battery device, and the thermal insulation layer is communicated with the accommodating cavity, so that the thermal management efficiency of the battery device can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a battery device, an energy storage system, and an electrical device. Background Art

[0002] Battery devices usually have thermal management requirements when in use. For example, thermal management of battery cells inside the battery device is performed through heat exchange components to meet the needs of heat dissipation during use of the battery cells and heating requirements during charging and discharging at low temperatures. However, the current thermal management efficiency is low.

[0003] Therefore, how to improve the thermal management efficiency of battery devices has become an urgent problem to be solved. Utility Model Content

[0004] The embodiments of the present application provide a battery device, an energy storage system, and an electrical device, which can improve the thermal management efficiency of the battery device.

[0005] In a first aspect, a battery device is provided, comprising: a box assembly having a accommodating cavity; a battery cell assembly comprising a plurality of battery cells, the battery cell assembly being accommodated in the accommodating cavity; a heat exchange assembly, the heat exchange assembly comprising a first wall and a second wall arranged opposite to each other, the first wall being in contact with the battery cell assembly, and the second wall being arranged on a side of the first wall away from the battery cell assembly; a third wall, the third wall being arranged on a side of the second wall away from the battery cell assembly, a thermal insulation layer being formed between the third wall and the second wall, and an inert gas being accommodated in the thermal insulation layer; wherein a side of the third wall away from the battery cell assembly is in contact with the outside of the battery device, and the thermal insulation layer is connected to the accommodating cavity.

[0006] In the technical solution provided in the embodiment of the present application, a thermal insulation layer is arranged on the outside of the heat exchange component, the accommodating cavity of the battery device is filled with an inert gas, and the thermal insulation layer is connected to the accommodating cavity. The inert gas can improve the reliability of the battery device on the one hand, and provide a thermal insulation effect for the heat exchange component on the other hand, thereby improving the thermal management efficiency of the battery device.

[0007] In some embodiments, an orthographic projection of the third wall in the thickness direction covers the second wall.

[0008] In the technical solution provided in the embodiment of the present application, the orthographic projection of the third wall in the thickness direction covers the second wall, and the second wall completely exchanges heat with the outside through the thermal insulation layer, further improving the thermal management efficiency.

[0009] In some embodiments, the battery device further includes: a connecting portion, the connecting portion connecting the heat exchange component and the third wall; the connecting portion is provided with an air flow channel, and the thermal insulation layer and the accommodating cavity are connected through the air flow channel.

[0010] In some embodiments, the connecting portion includes: a connecting plate, the connecting plate is provided with a first through hole along a thickness direction, and the first through hole forms an air flow channel.

[0011] In the technical solution provided in the embodiment of the present application, by providing the first through hole on the connecting plate, the structure of the battery device is stabilized, the gas exchange is stable, and the stability of the battery device is improved.

[0012] In some embodiments, the third wall includes: a main body wall and a peripheral wall, wherein the peripheral wall is connected to the main body wall and is close to the battery cell assembly along the thickness direction of the main body wall; wherein the connecting plate connects the heat exchange assembly and the peripheral wall.

[0013] In the technical solution provided in the embodiment of the present application, the third wall includes a main wall and a peripheral wall, and the peripheral wall is connected to the heat exchange component, thereby improving the thermal insulation effect of the thermal insulation layer and improving the stability of the battery device.

[0014] In some embodiments, a heat exchange medium flows in the heat exchange component, and the battery device also includes: an interface component, the interface component includes a first sleeve and a second sleeve, the second sleeve is sleeved on the outside of the first sleeve, the first medium flows in the first sleeve, and the second medium flows between the first sleeve and the second sleeve; wherein the first medium includes a heat exchange medium and the second medium includes an inert gas, or the first medium includes an inert gas and the second medium includes a heat exchange medium.

[0015] In the technical solution provided in the embodiment of the present application, circulation between two systems with different media and the outside world can be achieved through one interface component, which can improve the integration of battery devices and improve space utilization.

[0016] In some embodiments, the second wall is provided with a second through hole, and the third wall is provided with a third through hole; wherein, the first sleeve is connected to the second through hole, the heat exchange medium enters the heat exchange component through the second through hole, the second sleeve is connected to the third through hole, and the inert gas enters the insulation layer through the third through hole.

[0017] In the technical solution provided in the embodiment of the present application, an interface design is used to enable the heat exchange medium in the heat exchange component and the inert gas in the insulation layer to circulate, thereby simplifying the design of the interface and pipelines and improving the space utilization of the energy storage device or power-consuming device for installing the battery device.

[0018] In some embodiments, the first wall is provided with a fourth through hole, the second wall is provided with a fifth through hole, and the third wall is provided with a sixth through hole; wherein, the first sleeve and the second sleeve pass through the sixth through hole, the first sleeve is connected to the fourth through hole, the inert gas enters the accommodating cavity through the fourth through hole, the second sleeve is connected to the fifth through hole, and the heat exchange medium enters the heat exchange component through the fifth through hole.

[0019] In the technical solution provided in the embodiment of the present application, an interface design is used to enable the heat exchange medium in the heat exchange component and the inert gas in the containing cavity to circulate, thereby enabling the inert gas in the insulation layer to circulate, thereby simplifying the design of the interface and pipelines and improving the space utilization rate of the energy storage device or electrical device for installing the battery device.

[0020] In some embodiments, the interface assembly is connected to an interface pipeline, which includes a third sleeve and a fourth sleeve, and the fourth sleeve is sleeved on the outside of the third sleeve; wherein the third sleeve is connected to the first sleeve to circulate the first medium, and the fourth sleeve is connected to the second sleeve to circulate the second medium.

[0021] In some embodiments, the third sleeve is sleeved on the inner side of the first sleeve, and the fourth sleeve is sleeved on the outer side of the second sleeve.

[0022] In the technical solution provided in the embodiment of the present application, the third sleeve is sleeved on the inner side of the first sleeve, and the fourth sleeve is sleeved on the outer side of the second sleeve, so that the gap between the first sleeve and the second sleeve is fully utilized, thereby improving the circulation efficiency of this part of the medium.

[0023] In some embodiments, a first groove is provided on the side of the first sleeve facing the third sleeve, a second groove is provided on the side of the third sleeve facing the first sleeve, and a sealing component is provided between the first sleeve and the third sleeve; wherein a portion of the sealing component is accommodated in the first groove and the other portion is accommodated in the second groove.

[0024] In the technical solution provided in the embodiment of the present application, by setting grooves on the opposite walls of the first sleeve and the third sleeve to accommodate the sealing component, isolation between different media can be achieved, so that the media inside the insulation layer and the heat exchange component can circulate stably, thereby improving the stability of the battery device.

[0025] In some embodiments, an inner wall of the fourth sleeve is provided with an internal thread, and an outer wall of the second sleeve is provided with an external thread, and the internal thread and the external thread cooperate to fasten the interface pipeline and the interface assembly.

[0026] In the technical solution provided in the embodiment of the present application, the second sleeve and the fourth sleeve are connected by threads, which can tighten the interface and the pipeline to achieve stable operation of the system.

[0027] In some embodiments, a protrusion structure is provided on a side of the fourth sleeve facing the second sleeve; wherein the protrusion structure is configured to limit movement of the interface pipeline along the extension direction of the first sleeve when abutting against the end of the second sleeve.

[0028] In the technical solution provided in the embodiment of the present application, a protruding structure is provided on the side of the fourth sleeve facing the second sleeve, so that it can abut against the end of the second sleeve to limit the relative movement between the second sleeve and the fourth sleeve, thereby improving the reliability of the connection between the interface and the pipeline.

[0029] In some embodiments, bottom walls of the plurality of battery cells are in contact with the first wall.

[0030] In the technical solution provided by the embodiment of the present application, the bottom walls of the plurality of battery cells are in contact with the first wall, thereby simplifying the structural components in the battery device and improving the space utilization of the battery device.

[0031] In some embodiments, the surfaces with the largest surface areas of multiple battery cells are bonded to each other, and the multiple battery cells are arranged in a direction perpendicular to the surfaces with the largest surface areas of the multiple battery cells. The battery device also includes: an end plate, one side of the end plate is bonded to the surfaces with the largest surface areas of the battery cells located at both ends of the first direction among the multiple battery cells, and the other side of the end plate is bonded to the box.

[0032] In the technical solution provided in the embodiment of the present application, end plates are arranged on the large surfaces on both sides of multiple battery cells, which can provide restraint when the battery cells expand, reduce the stress when the battery cells expand, and improve the reliability of the battery device.

[0033] In a second aspect, an energy storage system is provided, comprising a battery device as described in any one of the first aspects.

[0034] In a third aspect, an electrical device is provided, comprising a battery device as described in any one of the first aspects.

[0035] In some embodiments, the electrical device is a vehicle, a ship, or a spacecraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic structural diagram of a vehicle according to an embodiment of the present application is shown;

[0037] Figure 2 A schematic diagram showing an energy storage device to which the present application may be applicable;

[0038] Figure 3 A partial structural schematic diagram of a battery device according to an embodiment of the present application is shown;

[0039] Figure 4 A schematic diagram of a battery device provided by an embodiment of the present application is shown;

[0040] Figure 5 A partial side view of a battery device provided by an embodiment of the present application is shown;

[0041] Figure 6 Shows this application Figure 5 A certain implementation of an AA cross-sectional view of a battery device;

[0042] Figure 7 Shows Figure 6 A partial enlarged view of part B;

[0043] Figure 8 A top view of a heat exchange component in a battery device of the present application is shown;

[0044] Fig. 9 Shows this application Figure 5 Another implementation of the AA cross-sectional view of the provided battery device;

[0045] Fig.10 Shows Fig. 9 A partial enlarged view of part C in the middle;

[0046] Fig.11 Shows this application Figure 5 Another implementation of the AA cross-sectional view of the provided battery device;

[0047] Fig.12 Shows Fig.11 A partial enlarged view of part D in the middle;

[0048] Fig.13 A three-dimensional cutaway view of a battery device provided by an embodiment of the present application is shown;

[0049] Fig.14 A side view of a battery device provided by an embodiment of the present application is shown;

[0050] Fig.15 Shows this application Fig.14 A certain implementation of an EE cross-sectional view of a battery device;

[0051] Fig.16 Shows Fig.15 A partial enlarged view of part F in the middle;

[0052] Fig.17 Shows this application Fig.14 Another implementation of the EE cross-sectional view of the battery device;

[0053] Fig.18 Shows Fig.17 A partial enlarged view of the middle G part;

[0054] Fig.19 A cross-sectional view of a battery device provided by an embodiment of the present application is shown;

[0055] Fig. 20 Shows this application Fig.14Another implementation of the EE cross-sectional view of the battery device;

[0056] Fig.21 Shows Fig. 20 A partial enlarged view of the middle H section;

[0057] Fig. 22 Shows this application Fig.14 Another implementation of the EE cross-sectional view of the battery device;

[0058] Fig.23 Shows Fig. 22 A partial enlarged view of part I;

[0059] Fig.24 A flow chart showing a method for preparing a battery device provided in one embodiment of the present application is shown;

[0060] Reference numerals:

[0061] 1-vehicle; 2-energy storage device; 10-battery device; 11-box assembly; 20-battery monomer; 30-controller; 40-motor; 50-battery compartment; 60-main control module; 70-thermal management module; 80-electrical module; 90-confluence module; 101-accommodation chamber; 111-first box body; 112-second box body; 200-battery monomer assembly; 300-heat exchange assembly; 310-first wall; 315-flow channel plate; 316-medium inlet; 317-medium outlet; 320-second wall; 330-third wall; 331 -main body wall; 332-peripheral wall; 333-insulating layer; 340-connecting part; 350-end plate; 410-first through hole; 510-interface assembly; 511-first sleeve; 512-second sleeve; 321-second through hole; 335-third through hole; 311-fourth through hole; 322-fifth through hole; 336-sixth through hole; 610-interface pipeline; 611-third sleeve; 612-fourth sleeve; 613-sealing component; 5111-first groove; 5121-external thread; 6111-second groove; 6121-protruding structure; 6122-internal thread;

[0062] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0063] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0064] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0065] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0066] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0067] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0068] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0069] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0070] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0071] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0072] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in mixed connection through a busbar.

[0073] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0074] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0075] In some embodiments, the battery device may be a battery pack, which includes a case assembly and one or more battery cell assemblies, wherein the battery cell assembly is accommodated in the case assembly.

[0076] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box assembly.

[0077] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0078] As an example, the box assembly may include a first box portion and a second box portion. The first box portion and the second box portion are buckled together to form a closed space inside the box assembly to accommodate the battery cell assembly. The closure here may be a seal. The first box portion may be a top cover or a bottom plate.

[0079] As an example, the box assembly may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box assembly to accommodate the battery cell assembly.

[0080] In some embodiments, the box assembly can be used as a part of the chassis structure of the vehicle. For example, part of the box assembly can become at least a part of the floor of the vehicle, or part of the box assembly can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0081] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0082] The technical solution described in the embodiments of the present application can also be applied to energy storage systems, for example, energy storage devices. The energy storage device may include one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple battery devices, and the multiple battery devices are connected in series through a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0083] The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during low power consumption and provide electrical energy to relevant users or electrical equipment during peak power consumption. The energy storage system provided in the embodiment of the present application can be any power system that requires the use of an energy storage device.

[0084] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0085] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0086] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0087] In some embodiments, the battery cell has a housing, which may include a shell and an end cap. The housing of the battery cell is provided with at least one electrode terminal, which is electrically connected to the tab. The electrode terminal may be directly connected to the tab or indirectly connected to the tab through a current collecting member. The electrode terminal may be provided on the end cap or on the shell.

[0088] The electrode terminals of the plurality of battery cells may be connected together by a connecting member.

[0089] In some embodiments, a pressure relief mechanism is provided on the housing, and the pressure relief mechanism is used to discharge the internal gas of the battery cell.

[0090] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0091] Battery devices usually have thermal management requirements when in use. For example, thermal management of battery cells inside the battery device is performed through heat exchange components to meet the needs of heat dissipation during use of the battery cells and heating requirements during charging and discharging at low temperatures. However, the current thermal management efficiency is low.

[0092] Therefore, how to improve the thermal management efficiency of battery devices has become an urgent problem to be solved.

[0093] An embodiment of the present application provides a battery device, comprising: a box assembly, having a accommodating cavity; a battery cell assembly, comprising a plurality of battery cells, the battery cell assembly being accommodated in the accommodating cavity; a heat exchange assembly, the heat exchange assembly comprising a first wall and a second wall arranged opposite to each other, the first wall being in contact with the battery cell assembly, and the second wall being arranged on a side of the first wall away from the battery cell assembly; a third wall, the third wall being arranged on a side of the second wall away from the battery cell assembly, a thermal insulation layer being formed between the third wall and the second wall, and an inert gas being accommodated in the thermal insulation layer; wherein a side of the third wall away from the battery cell assembly is in contact with the outside of the battery device, and the thermal insulation layer is connected to the accommodating cavity.

[0094] In the technical solution provided in the embodiment of the present application, a thermal insulation layer is provided on the side of the heat exchange assembly away from the battery cell assembly, and the inert gas in the thermal insulation layer is connected to the accommodating cavity inside the battery device, so that the inert gas filled in the battery device can provide a thermal insulation effect for the heat exchange assembly while playing a flame retardant role, thereby improving the thermal management efficiency of the battery device.

[0095] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery devices.

[0096] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0097] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0098] For example, Figure 1 As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery device 10 may be provided inside the vehicle 1. The controller 30 is used to control the battery device 10 to supply power to the motor 40. For example, a battery device 10 may be provided at the bottom, front or rear of the vehicle 1. The battery device 10 may be used to supply power to the vehicle 1. For example, the battery device 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery device 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0099] Figure 2 A schematic diagram of an energy storage device 2 that may be applicable to the present application is shown.

[0100] The energy storage device 2 provided in the embodiment of the present application may include multiple battery compartments 50, and the multiple battery compartments 50 may accommodate multiple battery devices 10. Exemplarily, the battery compartment 50 may be provided with multiple battery device 10 installation positions along the gravity direction to accommodate multiple battery devices 10, and the battery device 10 may be placed in or out of the battery device 10 installation position of the battery compartment 50 from the entrance, and the battery device 10 may be fixed by a locking mechanism after the battery device 10 is installed in the battery device 10 installation position. The battery device 10 installation position may include two guide rails and two side walls arranged oppositely, the two guide rails are used to carry the battery device 10, and the two guide rails are respectively arranged on the two side walls along the same height, and adjacent battery compartments 50 may share the same side wall.

[0101] A plurality of battery compartments 50 are provided in the energy storage device 2, and a common side wall can be provided between the plurality of battery compartments 50 to form a plurality of battery compartments 50, so that the battery device 10 can be provided in the energy storage device 2. In addition to the box structure of the energy storage device 2, no additional cabinet is required.

[0102] Exemplarily, the shape of the energy storage device 2 may be a rectangular parallelepiped, but the embodiment of the present application is not limited thereto, and the energy storage device 2 may also be other shapes. In addition, in order to facilitate transportation and reduce transportation costs, the energy storage device 2 of the embodiment of the present application may be a container of standard size, for example, a 20-foot or 40-foot container may be used, but the embodiment of the present application is not limited thereto.

[0103] The energy storage device 2 may further include a main control module 60. As an example, the main control module 60 may be used as a battery management unit of a battery cluster to monitor and manage the battery cluster. The main control module 60 may be used to accommodate a main control box, which is used to electrically connect the battery device 10 in the battery compartment 50. The main control module 60 may monitor information such as the current, voltage, power or temperature of the battery cluster. For example, the charge and discharge current and voltage of the battery cluster may be controlled. The main control module 60 includes modules such as an auxiliary battery management unit and a fusion switch.

[0104] The energy storage device 2 may further include a thermal management module 70, which may accommodate a thermal management component to perform thermal management on the energy storage device 2. For example, the energy storage device 2 may be heated or cooled. As an example, the thermal management module 70 may include a liquid cooling unit, which provides cooling liquid for regulating the temperature of the battery cells 20 to each battery device 10 through a pipeline.

[0105] The energy storage device 2 may also include a fire protection module. For example, the fire protection module includes a control panel, a detector, an alarm device, a fire extinguishing device, etc., which are used to detect, alarm or extinguish fires in the energy storage system. For example, the fire extinguishing device may be installed in the battery compartment 50, but the embodiment of the present application is not limited to this.

[0106] The energy storage device 2 may further include an electrical module 80 . The electrical module 80 may include electrical components, for example, may include at least one of the following components: a distribution box, an inverter, a master control box, and a fan.

[0107] The energy storage device 2 may further include a confluence module 90, which may include a confluence component, which is used to be electrically connected to the main control module 60, etc. For example, the high-voltage line from the main control module 60 may be connected to the confluence component through the wire groove at the bottom of the box, such as the confluence component can realize parallel connection between multiple main control boxes.

[0108] The energy storage device 2 may also be provided with a top wall, which is arranged above along the direction of gravity, thereby providing certain protection for the entire energy storage device 2.

[0109] The above is merely exemplary, and the energy storage device 2 may include more components than the above examples, or may omit some of the components in the above examples, which is not limited in the embodiments of the present application.

[0110] Figure 3 FIG. 1 is a schematic diagram showing a partial structure of a battery device 10 according to an embodiment of the present application. Figure 2 As shown, the battery device 10 of the embodiment of the present application may include a battery cell assembly 200, and the battery cell assembly 200 may include one or more battery cells 20 to meet different power requirements. The shape of the battery cell 20 of the embodiment of the present application can be set according to actual applications. For example, the battery cell 20 can be as follows: Figure 3 The square shell battery shown, or it can also be different from Figure 3 The other shapes shown are not limited to the embodiments of the present application.

[0111] It should be understood that Figure 3 As shown, the battery device 10 of the embodiment of the present application may further include a box assembly 11, which may be used to accommodate a battery cell assembly 200, and the battery cell assembly 200 may include one or more battery cells 20. The box assembly 11 of the embodiment of the present application is a hollow structure, and multiple battery cells 20 are accommodated in the box assembly 11. The box assembly 11 may include multiple parts, such as Figure 3 The box assembly 11 shown may include two parts, which are referred to herein as a first box portion 111 and a second box portion 112. These two parts are merely schematic and should not constitute an inappropriate limitation on the present application. In other embodiments, the two parts may have other names. The first box portion 111 and the second box portion 112 snap together. The shapes of the first box portion 111 and the second box portion 112 may be determined according to the shapes of the components contained therein. For example, they may be determined according to the shape of the combination of multiple battery cells 20 contained therein. At least one of the first box portion 111 and the second box portion 112 may have an opening. For example, as Figure 2As shown, the first box body 111 and the second box body 112 can both be hollow cuboids with one face being an open face, the opening of the first box body 111 and the opening of the second box body 112 are arranged opposite to each other, and the first box body 111 and the second box body 112 are buckled together to form a box assembly 11 with a closed chamber, which can be used to accommodate multiple battery cells 20. Multiple battery cells 20 are connected in parallel, in series, or in a mixed combination and placed in the box assembly 11 formed by buckling the first box body 111 and the second box body 112. In some embodiments, the box assembly 11 can also include three parts, for example, respectively including the first box body 111, the second box body 112 and a frame.

[0112] For example, unlike Figure 3 As shown, only one of the first box body 111 and the second box body 112 may be a hollow cuboid with an opening, while the other is in a plate shape to cover the opening. Taking the second box body 112 as a hollow cuboid with an opening and the first box body 111 as a plate, the first box body 111 covers the opening of the second box body 112 to form a box assembly 11 with a closed chamber, which can be used to accommodate multiple battery cells 20.

[0113] The battery device 10 can also be integrated into an electrical device. For example, the box assembly 11 of the battery device 10 can be a part of the electrical device. Exemplarily, the electrical device can be a vehicle 1. The chassis of the vehicle 1 can serve as a part of the box assembly 11 of the battery device 10. The chassis is provided with a accommodating cavity 101. The inner wall of the accommodating cavity 101 can serve as other walls of the box assembly 11 to accommodate the battery cell 20.

[0114] The figure schematically shows some components of the battery device 10, but the battery device 10 may also include other components. For example, the battery device 10 may also include a partition, and a part of the space in the battery device 10 is isolated by the partition.

[0115] The battery device 10 may also be provided with a heat exchange assembly 300, which may provide thermal management for the battery device 10. For example, the heat exchange assembly 300 may be in the form of a cooling plate to provide thermal management for the battery cell 20. The heat exchange assembly 300 provides thermal management for the battery cell 20 through a heat exchange medium.

[0116] In some possible embodiments, the heat exchange assembly 300 and some other parts may become part of the second box body 112. The heat exchange assembly 300 may also be disposed outside the second box body 112, which is not limited in the embodiment of the present application.

[0117] Combine the following Figure 4-Figure 8 A battery device 10 provided in one embodiment of the present application is described.

[0118] Figure 4 A schematic diagram of a battery device 10 provided in one embodiment of the present application is shown; Figure 5 A partial side view of a battery device 10 provided in one embodiment of the present application is shown; Figure 6 Shows this application Figure 5 A certain implementation of an AA cross-sectional view of a battery device; Figure 7 Shows Figure 6 A partial enlarged view of part B; Figure 8 A top view of the heat exchange assembly 300 in the battery device 10 of the present application is shown.

[0119] like Figure 4 As shown, in some embodiments, the battery device 10 includes a box assembly 11, the box assembly 11 has a accommodating cavity 101; a battery cell assembly 200, including a plurality of battery cells 20, the battery cell assembly 200 is accommodated in the accommodating cavity 101; a heat exchange assembly 300, the heat exchange assembly 300 includes a first wall 310 and a second wall 320 arranged opposite to each other, the first wall 310 is attached to the battery cell assembly 200, and the second wall 320 is arranged on a side of the first wall 310 away from the battery cell assembly 200; a third wall 330, the third wall 330 is arranged on a side of the second wall 320 away from the battery cell assembly 200, and a thermal insulation layer 333 is formed between the third wall 330 and the second wall 320, and an inert gas is accommodated in the thermal insulation layer 333; wherein, the side of the third wall 330 away from the battery cell assembly 200 is in contact with the outside of the battery device 10, and the thermal insulation layer 333 is connected to the accommodating cavity 101.

[0120] refer to Figure 3 The box assembly 11 may include a first box portion 111 and a second box portion 112, and the heat exchange assembly 300 and the third wall 330 may be a part of the first box portion 111 or the second box portion 112, for example, Figure 4 The middle heat exchange component 300 and the third wall 330 serve as part of the second box body portion 112, and the first box body portion 111 is snapped onto the edge of the third wall 330, thereby forming a accommodating chamber 101 in the box body assembly 11. The accommodating chamber 101 can be a sealed accommodating chamber so that an inert gas can be accommodated in the accommodating chamber 101.

[0121] The sealed accommodating chamber 101 may be a accommodating chamber 101 with a relatively low gas leakage rate. The accommodating chamber 101 may be connected to an air pump or a gas generator, which continuously introduces an inert gas into the battery device 10. The gas in the battery device 10 may be slowly replaced by the inert gas, so that the accommodating chamber 101 is always in an environment with a relatively low oxygen concentration, which may be less than 5%. In such an environment, even in the extreme case of thermal runaway of the battery device 10, the runaway heat flow lacks the conditions for diffusion, thereby improving the reliability of the battery device 10.

[0122] The battery cell assembly 200 may be fixed by the end plate 350 , so as to restrain the battery cell 20 when the battery cell 20 expands. The battery cell 20 may also be provided with no end plate 350 , which is not limited in the embodiment of the present application.

[0123] The battery cell assembly 200 may be bound by steel strips to facilitate the integration of the battery cell assembly 200 . The battery cell assembly 200 may also have no clear boundaries, but is merely an artificial division of the battery cell 20 cluster, which is not limited in the embodiments of the present application.

[0124] The number of battery cell assemblies 200 is not limited, and can be one or more. The arrangement of battery cells 20 between battery cell assemblies 200 and within battery cell assemblies 200 is not limited. For example, Figure 4 In the embodiment, the walls of the battery cells 20 with the largest surface areas are adjacent to each other and are arranged in a direction perpendicular to the walls with the largest surface areas, and the side walls of the battery cells 20 in adjacent battery cell assemblies 200 are adjacent to each other and are arranged in a direction perpendicular to the side walls.

[0125] The heat exchange assembly 300 may include other structures in addition to the first wall 310 and the second wall 320. For example, Figure 8 In the figure, the heat exchange component 300 may also include structures such as a flow channel plate 315, a medium inlet 316, and a medium outlet 317. The medium inlet 316 may be an interface. When in use, the interface is connected to a pipeline for conveying a heat exchange medium. The heat exchange medium may enter the heat exchange component 300 through the medium inlet 316. The flow channel plate 315 may be arranged according to the battery cell 20 placement area arranged on the first wall 310, so that the heat exchange medium can fully exchange heat with the battery cell 20. After the heat exchange medium exchanges heat with the battery cell 20, it flows out from the medium outlet 317, thereby completing the circulation of the heat exchange medium.

[0126] The insulation layer 333 is connected with the accommodating chamber 101, which can be understood as the gas in the insulation layer 333 and the accommodating chamber 101 can be exchanged with each other. For example, the insulation layer 333 can be connected with the accommodating chamber 101 through a through hole. For another example, the insulation layer 333 can be connected with the accommodating chamber 101 through a breathable membrane. For another example, the insulation layer 333 can be connected with the accommodating chamber 101 through a pipeline. The embodiments of the present application are not limited to this.

[0127] The inert gas may be a flame retardant gas, such as carbon dioxide, argon, nitrogen, helium, etc., but the embodiments of the present application are not limited thereto.

[0128] The third wall 330 can be a wall. For example, the third wall 330 has the same size as the second wall 320. In this case, the insulation layer 333 can be connected to the accommodating cavity 101 through a pipeline, or can be connected to the accommodating cavity 101 through the structure of the through-heat exchange component 300. This embodiment of the present application does not limit this.

[0129] The third wall 330 may also be a plurality of walls, and the plurality of walls are connected so as to better enable the thermal insulation layer 333 to cover the heat exchange component 300 .

[0130] The third wall 330 may cover part of the heat exchange assembly 300 in the thickness direction, or may cover the entire heat exchange assembly 300. Even if only part of the heat exchange assembly 300 is covered, the thermal management efficiency may be improved.

[0131] The accommodating cavity 101 of the battery device 10 is connected to the thermal insulation layer 333. On the one hand, the inert gas contained in the battery device 10 reduces the oxygen content inside the battery device 10, thereby improving the reliability of the battery device 10. On the other hand, the specific heat capacity of the inert gas is higher than that of the air, and the thermal conductivity between the heat exchange component 300 and the outside world is lower. Moreover, the inert gas is connected to the inside of the battery device 10, and part of the energy exchanged between the heat exchange component 300 and the inert gas can also be returned to the inside of the battery device 10, thereby enabling the thermal insulation layer 333 to preserve the energy of the heat exchange component 300.

[0132] In the technical solution provided in the embodiment of the present application, a thermal insulation layer 333 is arranged on the outer side of the heat exchange component 300, the accommodating cavity 101 of the battery device 10 is filled with an inert gas, and the thermal insulation layer 333 is connected to the accommodating cavity 101. The inert gas can improve the reliability of the battery device 10 on the one hand, and can provide a thermal insulation effect for the heat exchange component 300 on the other hand, thereby improving the thermal management efficiency of the battery device 10.

[0133] In some possible embodiments, the orthographic projection of the third wall 330 in the thickness direction covers the second wall 320 .

[0134] In the technical solution provided in the embodiment of the present application, the orthographic projection of the third wall 330 in the thickness direction covers the second wall 320 , and the second wall 320 completely exchanges heat with the outside through the thermal insulation layer 333 , further improving the thermal management efficiency.

[0135] In some possible embodiments, the battery device 10 further includes a connecting portion 340 , which connects the heat exchange assembly 300 and the third wall 330 . The connecting portion 340 is provided with an air flow channel, and the thermal insulation layer 333 and the accommodating cavity 101 are connected through the air flow channel.

[0136] The connection portion 340 can be implemented in a variety of ways, for example, Figure 7 As shown, the connecting portion 340 can connect the first wall 310 and the third wall 330 , so that the first wall 310 and the third wall 330 are fixedly connected.

[0137] In some possible embodiments, the connecting portion 340 includes a connecting plate, and the connecting plate is provided with first through holes 410 along a thickness direction, and the first through holes 410 form an air flow channel.

[0138] The first through hole 410 may be one or more through holes, and the shape of the first through hole 410 is not limited in the embodiment of the present application. For example, the first through hole 410 may be a circular hole, an elliptical hole, a square hole, etc.

[0139] By providing a connecting plate to connect the heat exchange assembly 300 and the third wall 330 , the plate is less likely to break and shift, and the connection between the heat exchange assembly 300 and the third wall 330 is more stable.

[0140] A first through hole 410 is provided on the connecting plate, and the heat-insulating layer 333 and the accommodating cavity 101 are connected through the through hole, so that the gas flows more smoothly, thereby improving the stability of the battery device 10 .

[0141] In the technical solution provided in the embodiment of the present application, by providing the first through hole 410 on the connecting plate, the structure of the battery device 10 is stable, the gas exchange is stable, and the stability of the battery device 10 is improved.

[0142] In some possible embodiments, the third wall 330 includes: a main wall 331 and a peripheral wall 332, wherein the peripheral wall 332 is connected to the edge of the main wall 331 and is close to the accommodating cavity 101 along the thickness direction of the main wall 331; wherein the connecting plate connects the heat exchange assembly 300 and the peripheral wall 332.

[0143] The connecting plate can be connected to the peripheral wall 332 at any position in the height direction of the peripheral wall 332 , and these positions can play the role of fixedly connecting the heat exchange component 300 and the third wall 330 .

[0144] The peripheral wall 332 may also cover the side of the heat exchange component 300 , so that the entire heat exchange component 300 can exchange heat with the external environment through the thermal insulation layer 333 , thereby improving the thermal insulation effect of the thermal insulation layer 333 .

[0145] On the other hand, the peripheral wall 332 is arranged at the edge of the main wall 331, and the connecting plate is connected to the peripheral wall 332, so that the gas in the insulation layer 333 and the accommodating cavity 101 is exchanged on the peripheral side, which can reduce the impact of air convection on the structure inside the battery device 10.

[0146] In the technical solution provided in the embodiment of the present application, the third wall 330 includes a main wall 331 and a peripheral wall 332 , and the peripheral wall 332 is connected to the heat exchange assembly 300 , thereby improving the thermal insulation effect of the thermal insulation layer 333 and improving the stability of the battery device 10 .

[0147] The connection portion 340 may also include other connection methods, such as Figure 9-12 Some possible implementations of the connection portion 340 are given.

[0148] Fig. 9 Shows this application Figure 5 Another implementation of the AA cross-sectional view of the provided battery device; Fig.10 Shows Fig. 9 A partial enlarged view of part C in the middle; Fig.11 Shows this application Figure 5 Another implementation of the AA cross-sectional view of the provided battery device; Fig.12 Shows Fig.11 A partial enlarged view of part D.

[0149] For example, Fig. 9 and Fig.10 As shown, the connecting part 340 can connect the second wall 320 and the third wall 330. The connecting part 340 can be a connecting plate, a connecting column, a connecting inclined column, etc. When the connecting part 340 is a connecting plate, the connecting plate can be provided with a through hole so that the insulation layer 333 is connected to the gas of the accommodating cavity 101.

[0150] For example, Fig.11 and Fig.12 As shown, the connecting portion 340 can connect the second wall 320 and the third wall 330 or the side wall of the heat exchange assembly 300 and the third wall 330. For example, the heat exchange assembly 300 can be provided with a connecting plate extending toward the third wall 330, and a fixing plate is provided at the end of the connecting plate. The fixing plate and the third wall 330 are stacked and fixedly connected. The fixed connection method can include various methods, for example, Fig.12 Bolts are used to fix the heat exchange assembly 300 and the third wall 330 so that the heat exchange assembly 300 and the third wall 330 can be detachably connected to facilitate maintenance.

[0151] Combine the following Figures 13 to 18 The battery device 10 provided in some embodiments of the present application is described.

[0152] Fig.13 A three-dimensional cutaway view of a battery device 10 provided in one embodiment of the present application is shown; Fig.14 A side view of a battery device 10 provided in one embodiment of the present application is shown; Fig.15 Shows this application Fig.14 A certain implementation of an EE cross-sectional view of a battery device; Fig.16 Shows Fig.15 A partial enlarged view of part F in the middle; Fig.17 Shows this application Fig.14 Another implementation of the EE cross-sectional view of the battery device; Fig.18 Shows Fig.17 A partial enlarged view of part G in the middle.

[0153] In some possible embodiments, a heat exchange medium flows in the heat exchange component 300, and the battery device 10 also includes: an interface component 510, the interface component 510 includes a first sleeve 511 and a second sleeve 512, the second sleeve 512 is sleeved on the outside of the first sleeve 511, the first medium flows in the first sleeve 511, and the second medium flows between the first sleeve 511 and the second sleeve 512.

[0154] In some possible embodiments, such as Fig.13 and Fig.14 As shown, the first medium may include a heat exchange medium, and the second medium may include an inert gas.

[0155] In some possible embodiments, such as Fig.15 and Fig.16 As shown, the first medium comprises an inert gas, and the second medium comprises a heat exchange medium.

[0156] The second sleeve 512 is sleeved on the outside of the first sleeve 511 , which can be understood as the second sleeve 512 is arranged around the outside of the first sleeve 511 .

[0157] The shapes of the first sleeve 511 and the second sleeve 512 are not limited. For example, the first sleeve 511 and the second sleeve 512 can be round cylinders, square cylinders, etc.

[0158] In the battery device 10 currently used, the circulation of fluid and gas is often carried out through two different sets of interfaces. Different interfaces are respectively connected to different pipelines for fluid exchange and gas exchange. The fluid uses a fluid interface and a fluid pipeline, and the gas uses a gas interface and a gas pipeline. Such an arrangement will make the installation of the battery device 10 complicated and occupy a large amount of external space, which is not conducive to the integration of the energy storage device 2 or the electrical device. The interface component 510 in the embodiment of the present application can be provided with a double-layer sleeve. The medium circulating in the first sleeve 511 is different from the medium circulating between the first sleeve 511 and the second sleeve 512, thereby realizing the circulation of different media through one interface.

[0159] In the technical solution provided in the embodiment of the present application, circulation between two systems with different media and the outside world can be realized through an interface component 510, which can improve the integration of devices using the battery device 10 and improve space utilization.

[0160] In some possible embodiments, such as Fig.15 and Fig.16 As shown, the second wall 320 is provided with a second through hole 321, and the third wall 330 is provided with a third through hole 335; wherein, the first sleeve 511 is connected to the second through hole 321, and the heat exchange medium enters the heat exchange component 300 through the second through hole 321, and the second sleeve 512 is connected to the third through hole 335, and the inert gas enters the insulation layer 333 through the third through hole 335.

[0161] The first sleeve 511 may be connected to the second through hole 321 by forming the first sleeve 511 and the second wall 320 in one piece, or the first sleeve 511 may be connected to the second through hole 321 by a connecting structure, for example, a wedge-shaped structure is provided at the end of the first sleeve 511, so that the wedge-shaped structure is buckled in the first through hole 410, and the first sleeve 511 may also be connected to the second through hole 321 by other connecting structures, and the embodiment of the present application is not limited thereto. Other descriptions related to the connection between the sleeve and the through hole can also refer to this paragraph, and no further elaboration is made here.

[0162] The first sleeve 511 flows the heat exchange medium, and the gap between the first sleeve 511 and the second sleeve 512 flows the inert gas. Through an interface, the heat exchange medium can be transported to the interior of the heat exchange component 300, and the inert gas can be transported to the thermal insulation layer 333. The thermal insulation layer 333 is connected to the accommodating chamber 101, so that the accommodating chamber 101 is gradually filled with the inert gas.

[0163] In the technical solution provided in the embodiment of the present application, an interface design is used to enable the heat exchange medium in the heat exchange assembly 300 and the inert gas in the insulation layer 333 to circulate, thereby simplifying the design of the interface and pipelines and improving the space utilization of the energy storage device 2 or the electrical device for installing the battery device 10.

[0164] In some possible embodiments, such as Fig.17 and Fig.18 As shown, the first wall 310 is provided with a fourth through hole 311, the second wall 320 is provided with a fifth through hole 322, and the third wall 330 is provided with a sixth through hole 336; wherein, the first sleeve 511 and the second sleeve 512 pass through the sixth through hole 336, the first sleeve 511 is connected to the fourth through hole 311, the inert gas enters the accommodating chamber 101 through the fourth through hole 311, the second sleeve 512 is connected to the fifth through hole 322, and the heat exchange medium enters the heat exchange component 300 through the fifth through hole 322.

[0165] Inert gas flows through the first sleeve 511, and heat exchange medium flows through the gap between the first sleeve 511 and the second sleeve 512. The heat exchange medium can be transported to the interior of the heat exchange component 300 through an interface, and the inert gas can be transported to the accommodating cavity 101. The insulation layer 333 is connected to the accommodating cavity 101, so that the insulation layer 333 is gradually filled with inert gas.

[0166] In the technical solution provided in the embodiment of the present application, an interface design is used to enable the heat exchange medium in the heat exchange assembly 300 and the inert gas in the accommodating cavity 101 to circulate, thereby enabling the inert gas in the insulation layer 333 to circulate, thereby simplifying the design of the interface and pipelines and improving the space utilization rate of the energy storage device 2 or the electrical device for installing the battery device 10.

[0167] Combine the following Figures 19 to 23 The battery device 10 provided in some embodiments of the present application is described.

[0168] Fig.19 A cross-sectional view of a battery device 10 provided in one embodiment of the present application is shown; Fig. 20 Shows this application Fig.14 Another implementation of the EE cross-sectional view of the battery device; Fig.21 Shows Fig. 20 A partial enlarged view of the middle H section; Fig. 22 Shows this application Fig.14 Another implementation of the EE cross-sectional view of the battery device; Fig.23 Shows Fig. 22 A partial enlarged view of part I.

[0169] In some possible embodiments, the interface assembly 510 is connected to an interface pipeline 610, and the interface pipeline 610 includes a third sleeve 611 and a fourth sleeve 612, and the fourth sleeve 612 is sleeved on the outside of the third sleeve 611; wherein the third sleeve 611 is connected to the first sleeve 511 to circulate the first medium, and the fourth sleeve 612 is connected to the second sleeve 512 to circulate the second medium.

[0170] The connection between the third sleeve 611 and the first sleeve 511 may be that the opening of the third sleeve 611 is connected to the opening of the first sleeve 511, or the inner wall of the third sleeve 611 is connected to the outer wall of the first sleeve 511, or the outer wall of the third sleeve 611 is connected to the inner wall of the first sleeve 511, but the embodiments of the present application are not limited thereto.

[0171] The connection between the first sleeve 511 and the third sleeve 611 may be a fixed connection or a movable connection, such as a plug-in connection, a snap connection, a butt connection, a threaded connection, etc.

[0172] For example, in some possible embodiments, Fig. 20 and Fig.21 As shown, the third sleeve 611 can be disposed inside the first sleeve 511 .

[0173] The third sleeve 611 is disposed inside the first sleeve 511 to reduce the space occupied between the first sleeve 511 and the second sleeve 512 , thereby improving the communication efficiency of the outer medium.

[0174] In some possible embodiments, the fourth sleeve 612 is sleeved on the outer side of the second sleeve 512 .

[0175] The fourth sleeve 612 is disposed outside the second sleeve 512 to reduce the space occupied between the first sleeve 511 and the second sleeve 512 and improve the communication efficiency of the outer medium.

[0176] In the technical solution provided in the embodiment of the present application, the third sleeve 611 is sleeved on the inner side of the first sleeve 511, and the fourth sleeve 612 is sleeved on the outer side of the second sleeve 512, so that the gap between the first sleeve 511 and the second sleeve 512 is fully utilized, thereby improving the circulation efficiency of this part of the medium.

[0177] In some possible embodiments, a first groove 5111 is provided on a side of the third sleeve 611 facing the first sleeve 511, a second groove 6111 is provided on a side of the first sleeve 511 facing the third sleeve 611, and a sealing component 613 is provided between the first sleeve 511 and the third sleeve 611; wherein a portion of the sealing component 613 is accommodated in the first groove 5111 and the other portion is accommodated in the second groove 6111.

[0178] The sealing component 613 may be a rubber ring or the like, which is not limited in the embodiment of the present application.

[0179] The sealing component 613 can be pre-compressed and placed in the second groove 6111 of the third sleeve 611 before assembly. After the third sleeve 611 is assembled into place, the sealing component 613 expands to seal the gap between the first sleeve 511 and the third sleeve 611.

[0180] The sealing component 613 may also have the function of limiting the relative displacement between the first sleeve 511 and the third sleeve 611 , which is not limited in the present application.

[0181] In the technical solution provided in the embodiment of the present application, by setting grooves on the opposite walls of the first sleeve 511 and the third sleeve 611 to accommodate the sealing component 613, isolation between different media can be achieved, so that the medium inside the insulation layer 333 and the heat exchange component 300 can circulate stably, thereby improving the stability of the battery device 10.

[0182] In some possible embodiments, such as Fig. 22 and Fig.23 As shown, the inner wall of the fourth sleeve 612 is provided with an internal thread 6122 , and the outer wall of the second sleeve 512 is provided with an external thread 5121 . The internal thread 6122 and the external thread 5121 cooperate to fasten the interface pipeline 610 and the interface assembly 510 .

[0183] In the technical solution provided in the embodiment of the present application, the second sleeve 512 and the fourth sleeve 612 are connected by threads, which can tighten the interface and the pipeline to achieve stable operation of the system.

[0184] In some possible embodiments, a protrusion structure 6121 is provided on a side of the fourth sleeve 612 facing the second sleeve 512 ; wherein the protrusion structure 6121 is configured to limit the movement of the interface pipe 610 along the extension direction of the first sleeve 511 when abutting against the end of the second sleeve 512 .

[0185] In the technical solution provided in the embodiment of the present application, a protrusion structure 6121 is provided on the side of the fourth sleeve 612 facing the second sleeve 512, so that it can abut against the end of the second sleeve 512 to limit the relative movement between the second sleeve 512 and the fourth sleeve 612, thereby improving the reliability of the connection between the interface and the pipeline.

[0186] In some possible embodiments, the bottom walls of the plurality of battery cells 20 are in contact with the first wall 310 .

[0187] If the heat exchange assembly 300 is in contact with the side wall or the wall with the largest surface area of ​​the battery cell 20, multiple heat exchange assemblies 300 need to be provided, and the multiple heat exchange assemblies 300 are connected by connecting pipes. The first wall 310 is in contact with the bottom walls of multiple battery cells 20, and the first wall 310 can be provided continuously. Compared with the solution in which the first wall 310 is in contact with the side wall or the wall with the largest surface area of ​​the battery cell 20, the space occupied by the pipelines between the heat exchange assemblies 300 can be saved, and the complexity of the system can be simplified.

[0188] In the technical solution provided by the embodiment of the present application, the bottom walls of the plurality of battery cells 20 are in contact with the first wall 310 , thereby simplifying the structural components in the battery device 10 and improving the space utilization of the battery device 10 .

[0189] In some possible embodiments, the surfaces with the largest surface areas of the multiple battery cells 20 are bonded to each other, and the multiple battery cells 20 are arranged in a direction perpendicular to the surfaces with the largest surface areas of the multiple battery cells 20. The battery device 10 also includes: an end plate 350, one side of the end plate 350 is bonded to the surfaces with the largest surface areas of the battery cells 20 located at both ends of the first direction among the multiple battery cells 20, and the other side of the end plate 350 is bonded to the box.

[0190] In the technical solution provided in the embodiment of the present application, end plates 350 are provided on both sides of the plurality of battery cells 20 , which can provide restraint when the battery cells 20 expand, reduce the stress of the battery cells 20 when expanding, and improve the reliability of the battery device 10 .

[0191] Fig.24 A flow chart of a method for preparing a battery device 10 provided in one embodiment of the present application is shown.

[0192] like Fig.24 As shown, the preparation method comprises:

[0193] S810, providing a box assembly 11, wherein the box assembly 11 has a receiving cavity 101.

[0194] The receiving chamber 101 may be used to receive a battery cell assembly 200 , where the battery cell assembly 200 includes one or more battery cells 20 .

[0195] S820, providing a heat exchange assembly 300, wherein the heat exchange assembly 300 includes a first wall 310 and a second wall 320 that are arranged opposite to each other.

[0196] The heat exchange component 300 may be prepared by a brazing process, or may be prepared by other processes, which is not limited in the embodiment of the present application.

[0197] The embodiment of the present application does not limit whether or not the flow channel plate 315 of the heat exchange assembly 300 is provided or how it is provided.

[0198] S830 , providing a third wall 330 , wherein the third wall 330 is connected to the battery device 10 .

[0199] The third wall 330 can be integrally formed with the box assembly 11 of the battery device 10, for example, prepared by a casting process. The third wall 330 can also be welded to the box assembly 11 or the heat exchange assembly 300, but the embodiment of the present application is not limited thereto.

[0200] S840, placing a foam mold on the side of the third wall 330 facing the accommodating cavity 101, wherein the foam mold includes an escape space, and the escape space is used to escape the heat exchange component 300.

[0201] The foam mold can be made into the shape of the insulation layer 333 , thereby occupying the space of the insulation layer 333 to reserve a position for the heat exchange component 300 .

[0202] S850 , placing the heat exchange assembly 300 in the avoidance space and connecting it to the battery device 10 .

[0203] The embodiment of the present application does not limit the manner in which the heat exchange assembly 300 is connected to the battery device 10, and may be connected by welding, clamping, bolting, etc.

[0204] S860 , burning the foam mold to form a thermal insulation layer 333 between the second wall 320 and the third wall 330 , wherein the thermal insulation layer 333 is used to contain an inert gas.

[0205] After the production is completed, the foam mold can be simply burned out to empty the space for the insulation layer 333. Compared with metal molds, the demoulding process is simple and the production efficiency is improved.

[0206] The heat-insulating layer 333 is connected to the accommodating cavity 101 . The specific connection method can refer to the above embodiment and will not be elaborated herein.

[0207] According to some embodiments of the present application, the present application further provides an electrical device, comprising a battery device 10 according to any of the above schemes, and the battery device 10 is used to provide electrical energy to the electrical device.

[0208] The power-consuming device may be any of the aforementioned devices or systems using the battery device 10 .

[0209] According to some embodiments of the present application, the present application further provides an energy storage system, comprising a battery device 10 of any of the above schemes, or a battery device 10 prepared according to the above method embodiments.

[0210] According to some embodiments of the present application, a battery device 10 is provided, including: a box assembly 11, having a housing chamber 101; a battery cell assembly 200, including a plurality of battery cells 20, the battery cell assembly 200 being accommodated in the housing chamber 101; a heat exchange assembly 300, the heat exchange assembly 300 including a first wall 310 and a second wall 320 arranged opposite to each other, the first wall 310 being attached to the battery cell assembly 200, the second wall 320 being arranged on a side of the first wall 310 away from the battery cell assembly 200; a third wall 330, the third wall 330 being arranged on a side of the second wall 320 away from the battery cell assembly 200, the third wall An insulation layer 333 is formed between the third wall 330 and the second wall 320, and an inert gas is contained in the insulation layer 333; the third wall 330 includes a main wall 331 and a peripheral wall 332, and the peripheral wall 332 is connected to the main wall 331 and is close to the battery cell assembly 200 along the thickness direction of the main wall 331; the battery device 10 also includes a connecting plate, which connects the heat exchange assembly 300 and the peripheral wall 332, and the connecting plate is provided with a first through hole 410 along the thickness direction; wherein, the side of the third wall 330 away from the battery cell assembly 200 is in contact with the outside of the battery device 10, and the insulation layer 333 and the accommodating cavity 101 are connected through the first through hole 410.

[0211] According to some embodiments of the present application, a battery device 10 is provided, including: a box assembly 11, having a housing chamber 101; a battery cell assembly 200, including a plurality of battery cells 20, the battery cell assembly 200 being accommodated in the housing chamber 101; a heat exchange assembly 300, a heat exchange medium flowing in the heat exchange assembly 300, the heat exchange assembly 300 including a first wall 310 and a second wall 320 arranged opposite to each other, the first wall 310 being attached to the battery cell assembly 200, the second wall 320 being arranged on a side of the first wall 310 away from the battery cell assembly 200; a third wall 330, the third wall 330 being arranged on a side of the second wall 320 away from the battery cell assembly 200, a heat preservation layer 333 being formed between the third wall 330 and the second wall 320, the heat preservation layer 333 contains inert gas, and the insulation layer 333 is connected to the accommodating chamber 101; the battery device 10 also includes: an interface component 510, the interface component 510 includes a first sleeve 511 and a second sleeve 512, the first sleeve 511 is sleeved on the outside of the second sleeve 512, a heat exchange medium flows in the first sleeve 511, and an inert gas flows between the first sleeve 511 and the second sleeve 512; the second wall 320 is provided with a second through hole 321, and the third wall 330 is provided with a third through hole 335; wherein the first sleeve 511 is connected to the second through hole 321, the heat exchange medium enters the heat exchange component 300 through the second through hole 321, the second sleeve 512 is connected to the third through hole 335, and the inert gas enters the insulation layer 333 through the third through hole 335.

[0212] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A box assembly (11) having a receiving cavity (101); A battery cell assembly (200), comprising a plurality of battery cells (20), wherein the battery cell assembly (200) is accommodated in the accommodation cavity (101); A heat exchange assembly (300), the heat exchange assembly (300) comprising a first wall (310) and a second wall (320) arranged opposite to each other, the first wall (310) being in contact with the battery cell assembly (200), and the second wall (320) being arranged on a side of the first wall (310) away from the battery cell assembly (200); a third wall (330), the third wall (330) being arranged on a side of the second wall (320) away from the battery cell assembly (200), a heat-insulating layer (333) being formed between the third wall (330) and the second wall (320), and an inert gas being contained in the heat-insulating layer (333); Wherein, a side of the third wall (330) away from the battery cell assembly (200) is in contact with the outside of the battery device, and the thermal insulation layer (333) is in communication with the accommodating cavity (101).

2. The battery device according to claim 1, characterized in that: The orthographic projection of the third wall (330) in the thickness direction covers the second wall (320).

3. The battery device according to claim 1 or 2, characterized in that: The battery device further comprises: a connecting portion (340), the connecting portion (340) connecting the heat exchange component (300) and the third wall (330); The connecting portion (340) is provided with an air flow channel, and the thermal insulation layer (333) and the accommodating cavity (101) are connected via the air flow channel.

4. The battery device according to claim 3, characterized in that: The connecting portion (340) comprises: A connecting plate, wherein the connecting plate is provided with a first through hole (410) along a thickness direction, wherein the first through hole (410) forms the air flow channel.

5. The battery device according to claim 4, characterized in that: The third wall (330) comprises: A main body wall (331) and a peripheral wall (332), wherein the peripheral wall (332) is connected to the main body wall (331) and is close to the battery cell assembly (200) along the thickness direction of the main body wall (331); Wherein, the connecting plate connects the heat exchange component (300) and the peripheral wall (332).

6. The battery device according to claim 1, characterized in that: A heat exchange medium flows through the heat exchange component (300), and the battery device further comprises: An interface component (510), the interface component (510) comprising a first sleeve (511) and a second sleeve (512), the second sleeve (512) being sleeved on the outside of the first sleeve (511), a first medium flowing in the first sleeve (511), and a second medium flowing between the first sleeve (511) and the second sleeve (512); Wherein, the first medium includes the heat exchange medium, the second medium includes the inert gas, or The first medium includes the inert gas, and the second medium includes the heat exchange medium.

7. The battery device according to claim 6, characterized in that: The second wall (320) is provided with a second through hole (321), and the third wall (330) is provided with a third through hole (335); The first sleeve (511) is connected to the second through hole (321), the heat exchange medium enters the heat exchange component (300) through the second through hole (321), the second sleeve (512) is connected to the third through hole (335), and the inert gas enters the thermal insulation layer (333) through the third through hole (335).

8. The battery device according to claim 6, characterized in that: The first wall (310) is provided with a fourth through hole (311), the second wall (320) is provided with a fifth through hole (322), and the third wall (330) is provided with a sixth through hole (336); The first sleeve (511) and the second sleeve (512) pass through the sixth through hole (336), the first sleeve (511) is connected to the fourth through hole (311), the inert gas enters the accommodating chamber (101) through the fourth through hole (311), the second sleeve (512) is connected to the fifth through hole (322), and the heat exchange medium enters the heat exchange assembly (300) through the fifth through hole (322).

9. The battery device according to any one of claims 6 to 8, characterized in that: The interface assembly (510) is connected to an interface pipeline (610), the interface pipeline (610) comprising a third sleeve (611) and a fourth sleeve (612), the fourth sleeve (612) being sleeved on the outside of the third sleeve (611); The third sleeve (611) is connected to the first sleeve (511) to allow the first medium to circulate, and the fourth sleeve (612) is connected to the second sleeve (512) to allow the second medium to circulate.

10. The battery device according to claim 9, characterized in that: The third sleeve (611) is sleeved on the inner side of the first sleeve (511), and the fourth sleeve (612) is sleeved on the outer side of the second sleeve (512).

11. The battery device according to claim 9, characterized in that: A first groove (5111) is provided on a side of the first sleeve (511) facing the third sleeve (611), a second groove (6111) is provided on a side of the third sleeve (611) facing the first sleeve (511), and a sealing component (613) is provided between the first sleeve (511) and the third sleeve (611); Part of the sealing component (613) is accommodated in the first groove (5111) and the other part is accommodated in the second groove (6111).

12. The battery device according to claim 9, characterized in that: An internal thread (6122) is provided on the inner wall of the fourth sleeve (612), and an external thread (5121) is provided on the outer wall of the second sleeve (512); the internal thread (6122) and the external thread (5121) cooperate to fasten the interface pipeline (610) and the interface assembly (510).

13. The battery device according to claim 9, characterized in that: A protruding structure (6121) is provided on a side of the fourth sleeve (612) facing the second sleeve (512); Wherein, the protruding structure (6121) is configured to limit the movement of the interface pipe (610) along the extension direction of the first sleeve (511) when abutting against the end of the second sleeve (512).

14. The battery device according to claim 1, characterized in that: The bottom walls of the plurality of battery cells (20) are in contact with the first wall (310).

15. The battery device according to claim 1, characterized in that: The surfaces with the largest surface areas of the plurality of battery cells (20) are bonded to each other, and the plurality of battery cells (20) are arranged along a first direction, wherein the first direction is perpendicular to the surfaces with the largest surface areas of the plurality of battery cells (20), and the battery device further comprises: An end plate (350), one side of the end plate (350) being bonded to a surface with the largest surface area of ​​the battery cells (20) located at both ends of the first direction among the plurality of battery cells (20), and the other side of the end plate (350) being bonded to the box body.

16. An energy storage system, characterized in that: A battery device comprising the battery device as claimed in any one of claims 1 to 15.

17. An electrical device, characterized in that: A battery device comprising the battery device as claimed in any one of claims 1 to 15.

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