Battery device, power utilization device and energy storage device

Abstract

The utility model provides a battery device, a power utilization device and an energy storage device, and belongs to the technical field of batteries. The battery device comprises a box body, a heat insulation part and a plurality of single batteries, the box body comprises a protection part, a bottom wall and a side wall connected to the bottom wall, the bottom wall and the side wall define an accommodating area for accommodating a plurality of battery monomers, the protection part is connected to the outer side, deviating from the accommodating area, of the bottom wall, and a filling space is formed between the protection part and the bottom wall; at least one beam body is arranged in the box body, the beam body is connected to the inner side, deviating from the protection piece, of the bottom wall, the beam body is used for dividing the accommodating area into a plurality of sub-areas, and at least one battery monomer is accommodated in each sub-area; the heat insulation component comprises a first heat insulation part and a second heat insulation part, the filling space is filled with the first heat insulation part, and the second heat insulation part is arranged between the beam body and the bottom wall. By arranging the first heat insulation part and the second heat insulation part, the heat insulation capacity of the battery device is improved, and the power and the cost of a heat management system of the battery device are reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device, an electrical device, and an energy storage device. Background Technology

[0002] Energy conservation and emission reduction are key to sustainable social development, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the automotive industry's sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In related technologies, in order to improve the impact of low-temperature environments on battery performance, it is particularly important to improve the battery's thermal insulation performance without excessively increasing the power of the battery thermal management system. Utility Model Content

[0004] This application aims to at least solve one of the technical problems existing in the background art. Therefore, one object of this application is to provide a battery device, an electrical device, and an energy storage device to improve the heat insulation capability of the battery device.

[0005] An embodiment of the first aspect of this application provides a battery device, including: a housing, a heat insulation component, and a plurality of battery cells; the housing includes a protective component, a bottom wall, and a side wall connected to the bottom wall, the bottom wall and the side wall forming a receiving area for accommodating the plurality of battery cells, the protective component being connected to the outer side of the bottom wall away from the receiving area, and a filling space being provided between the protective component and the bottom wall; at least one beam is provided inside the housing, the beam being connected to the inner side of the bottom wall away from the protective component, the beam being used to divide the receiving area into a plurality of sub-areas, each sub-area accommodating at least one battery cell; the heat insulation component includes a first heat insulation portion and a second heat insulation portion, the first heat insulation portion filling the filling space, and the second heat insulation portion being disposed between the beam and the bottom wall.

[0006] In the technical solution of this application embodiment, by filling a first heat insulation part between the bottom wall and the protective component, heat transfer from the battery cell to the bottom wall and then to the protective component can be blocked, thereby reducing heat conduction and convection inside and outside the casing and extending the heat conduction path from the battery cell to the outside of the casing. This enhances the insulation capability of the battery cell against the ambient temperature outside the casing, greatly improving the heat insulation capability of the battery device. Consequently, the requirements for the thermal management system can be reduced, as well as the power and cost of the thermal management system. By setting a second heat insulation part between the bottom wall and the beam, heat transfer from the battery cell through the beam to the bottom wall can be reduced, thereby reducing heat conduction and convection between the battery cell and the external environment through the beam, bottom wall, and protective component, further improving the heat insulation capability of the battery device.

[0007] In some embodiments, the heat insulation component further includes a third heat insulation portion, which is disposed between the first surface of the beam facing the sub-region and the battery cell.

[0008] In this embodiment, by setting a third heat insulation part between the battery cell and the beam, the heat transfer from the battery cell to the beam can be reduced, thereby reducing the heat conduction and heat convection between the battery cell and the external environment through the beam, bottom wall, and protective parts, and further improving the heat insulation and heat preservation capabilities of the battery device.

[0009] In some embodiments, the thickness H1 of the second heat insulation portion and the thickness H2 of the third heat insulation portion satisfy the condition: H1 > H2.

[0010] Since the bottom wall and beam are usually made of materials with good thermal conductivity such as metal, the heat transfer between them is faster. By increasing the thickness of the second heat insulation part between the bottom wall and beam, the heat insulation capacity between the bottom wall and beam can be further improved, thereby improving the heat insulation and heat preservation capacity of the battery device.

[0011] In some embodiments, the thickness H1 of the second heat insulation portion and the thickness H2 of the third heat insulation portion satisfy the condition: H1 / H2 > 2.

[0012] In this embodiment, by setting the thickness of the second heat insulation part to be more than twice the thickness of the third heat insulation part, the heat insulation capacity between the bottom wall and the beam can be further improved, the heat conduction path between the bottom wall and the beam can be blocked, thereby improving the heat insulation and heat preservation capacity of the battery device.

[0013] In some embodiments, the sidewall and the protective member are connected by a first fastener, and the head of the first fastener is exposed outside the protective member; the heat insulation member includes a fourth heat insulation portion that covers the head of the first fastener, and a portion of the fourth heat insulation portion is located between the protective member and the head of the first fastener.

[0014] By setting a fourth heat insulation section, the heat dissipation from the side wall to the outside through the first fastener can be reduced, thereby improving the heat insulation capacity of the heat transfer path from the battery cell through the air inside the casing, the side wall, and the first fastener to the external environment. At the same time, the fourth heat insulation section can also reduce the heat dissipation from the protective component to the outside through the first fastener, thereby improving the heat insulation effect of the heat transfer path through the protective component and the first fastener to the external environment, reducing heat loss, and improving the heat insulation effect of the battery cell.

[0015] In some embodiments, the beam and the protective member are connected by a second fastener, and the head of the second fastener is exposed outside the protective member; the heat insulation member includes a fifth heat insulation portion that covers the head of the second fastener, and a portion of the fifth heat insulation portion is located between the protective member and the head of the second fastener.

[0016] By setting a fifth heat insulation section, the heat dissipation of the beam directly to the outside through the second fastener can be reduced, thereby improving the heat insulation capacity of the heat transfer path from the battery cell through the beam and the second fastener to the external environment. At the same time, the fifth heat insulation section can also reduce the heat dissipation of the protective component directly to the outside through the second fastener, thereby improving the heat insulation effect of the heat transfer path through the protective component and the second fastener to the external environment, reducing heat loss, and improving the heat insulation effect of the battery cell.

[0017] In some embodiments, the housing is connected to a third fastener, the head of which is exposed outside the housing; the heat insulation component includes a sixth heat insulation portion that covers the head of the third fastener, and a portion of the sixth heat insulation portion is located between the housing and the head of the third fastener.

[0018] By setting a sixth heat insulation section, the heat loss of air or components inside the casing to the external environment through the third fastener can be reduced, thereby reducing heat loss and improving the heat insulation effect of the battery cells.

[0019] In some embodiments, the thermal conductivity C of the insulation component satisfies: C ≤ 0.02 W / (m·K), and / or the electrical conductivity D of the insulation component satisfies: D < 10. -6 S / m.

[0020] This embodiment improves the thermal insulation capacity of the thermal insulation component by setting its thermal conductivity to no higher than 0.02 W / (m·K), thereby improving the thermal insulation capacity of the battery device.

[0021] By setting the electrical conductivity of the insulation components to be less than 10 -6 S / m can improve the insulation capacity of thermal insulation components and enhance the safety performance of battery devices, thereby achieving dual protection of thermal and electrical insulation for battery devices while reducing costs.

[0022] In some embodiments, the battery device further includes: a first heat exchanger having a first heat exchange chamber for circulating a heat exchanger, and the first heat exchanger forming a bottom wall.

[0023] In this embodiment, by setting the first heat exchanger, the first heat exchanger can be directly used as the bottom wall of the housing to exchange heat with the battery cells, thereby improving space utilization and the energy density of the battery device. At the same time, the first heat insulation part can block heat conduction and heat convection between the first heat exchanger and the protective part, providing heat insulation for the battery device, improving the heat preservation performance of the battery device, and reducing the power requirements of the thermal management system, thus reducing costs.

[0024] In some embodiments, the battery device further includes a second heat exchanger having a second heat exchange chamber for circulating a heat exchanger, the second heat exchanger being disposed between battery cells.

[0025] In this embodiment, by setting a second heat exchanger, it can come into contact with a large surface of the battery cell, thereby exchanging heat with the battery cell and improving the heat exchange effect. At the same time, the first heat insulation part can block heat conduction and heat convection between the bottom wall and the protective part, providing heat insulation for the battery device, improving the heat preservation performance of the battery device, and reducing the power requirements of the thermal management system, thus reducing costs.

[0026] An embodiment of the second aspect of this application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy.

[0027] An embodiment of the third aspect of this application provides an energy storage device, which includes the battery device in the above embodiments, and the energy storage device is used to store electrical energy.

[0028] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0029] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0030] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0031] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0032] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0033] Figure 4 This is a schematic diagram of the internal partial structure of a battery device provided in some embodiments of this application;

[0034] Figure 5 for Figure 4 Top view;

[0035] Figure 6 for Figure 5 Sectional view at point AA;

[0036] Figure 7 for Figure 6 A partial schematic diagram at point B in the middle;

[0037] Figure 8 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0038] Figure 9 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1000 vehicles;

[0041] Battery unit 100, controller 200, motor 300;

[0042] Battery cell assembly 10, battery cell 11, end cap 12, housing 13, electrode assembly 14;

[0043] Box 20, first part 21, second part 22, first heat exchanger 23, second heat exchanger 24;

[0044] Protective component 400, first fastener 410, second fastener 420, third fastener 430;

[0045] Bottom wall 510, side wall 520, accommodating area 530, sub-area 531, filling space 540;

[0046] Heat insulation component 600, first heat insulation part 610, second heat insulation part 620, third heat insulation part 630, fourth heat insulation part 640, fifth heat insulation part 650, and sixth heat insulation part 660.

[0047] The beam body is 700, and the first surface is 710. Detailed Implementation

[0048] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0050] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0051] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0052] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, "a and / or b" can represent three cases: a exists alone, a and b exist simultaneously, and b exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0053] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0054] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0055] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0056] Currently, the application of rechargeable batteries is becoming increasingly widespread, judging from market trends. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in various electronic devices, such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As the application areas of rechargeable batteries continue to expand, the market demand is also constantly increasing.

[0057] Battery performance is affected by temperature, especially in low-temperature environments, and maintaining good battery performance has always been a key research focus. Among related technologies, CTP (Cell To Pack) has higher assembly efficiency than MTP (Module To Pack), but the bottom of its battery cells is directly bonded to a water-cooling plate, which is in turn directly connected to the battery pack. This results in a heat preservation time constant that is typically 1.5 times that of MTP, and its heat insulation performance is 50% worse than that of MTP. In addition, to achieve the same heat preservation effect as MTP, vehicles usually need to provide a more powerful thermal management system for CTP batteries, leading to a waste of power and cost in the thermal management system.

[0058] To address at least one of the aforementioned problems, embodiments of this application provide a battery device, an electrical device, and an energy storage device. The battery device includes a housing, a heat insulation component, and multiple battery cells. The housing includes a protective component, a bottom wall, and side walls connected to the bottom wall. The bottom wall and side walls enclose a receiving area for accommodating multiple battery cells. The protective component is connected to the outer side of the bottom wall away from the receiving area, and a filling space exists between the protective component and the bottom wall. At least one beam is disposed within the housing, connected to the inner side of the bottom wall away from the protective component. The beam divides the receiving area into multiple sub-areas, each containing at least one battery cell. The heat insulation component includes a first heat insulation portion and a second heat insulation portion. The first heat insulation portion fills the filling space, and the second heat insulation portion is disposed between the beam and the bottom wall. By filling the space between the bottom wall and the protective component with the first heat insulation portion, heat conduction and convection between the inside and outside of the housing can be reduced, and the heat conduction path from the battery cells to the outside of the housing can be extended. This enhances the insulation capability of the battery cells against the ambient temperature outside the housing, significantly improving the heat insulation capability of the battery device and reducing the power and cost of the battery device's thermal management system. By setting a second heat insulation section between the bottom wall and the beam, the heat transfer from the battery cells through the beam to the bottom wall can be reduced, thereby reducing the heat conduction and heat convection between the battery cells and the external environment through the beam, bottom wall, and protective components, and further improving the heat insulation capability of the battery device.

[0059] In addition, the heat insulation component occupies little space and is lightweight. When applied to CTP battery devices, it can improve battery energy density while also being lightweight and having high thermal management efficiency.

[0060] The technical solutions described in the embodiments of this application are applicable to battery devices, electrical devices using battery devices, and energy storage devices.

[0061] The energy storage device utilizing battery devices as a power source in this application embodiment includes one or more battery clusters to enhance the voltage and capacity of the energy storage device. A battery cluster may include multiple battery devices, which are connected in series via 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.

[0062] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices. As an example, the energy storage device is an energy storage container or an energy storage cabinet.

[0063] In this application embodiment, the power-consuming device using a battery as a power source can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0064] It should be understood that the technical solutions described in the embodiments of this application are not limited to the energy storage devices and electrical devices described above. However, for the sake of brevity, the following embodiments will all use a vehicle as an example of an electrical device.

[0065] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0066] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0067] Please refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery provided in some embodiments of this application.

[0068] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 10 for providing voltage and capacity. The battery cell assembly 10 may include multiple battery cells 11, which are connected in series, parallel, or mixed connection via a busbar.

[0069] In some embodiments, the battery cell assembly 10 is typically formed by arranging a plurality of battery cells 11.

[0070] As an example, the battery cell assembly 10 can be a battery module, which is formed by arranging and fixing multiple battery cells 11 together to form an independent module. As an example, the battery module can be formed by bundling multiple battery cells 11 together with cable ties.

[0071] In some embodiments, such as Figure 2 As shown, the battery device 100 can be a battery pack, which includes a housing 20 and one or more individual battery cells 10, with the individual battery cells 10 housed within the housing 20. The housing 20 can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of combinations of simple cuboids, cylinders, or spheres. The material of the housing 20 can be an alloy such as aluminum alloy or iron alloy, a polymer such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0072] As an example, the battery cell assembly 10 can be a battery module, and the battery cell assembly 10 can be housed in the housing 20 by fixing the battery module in the housing 20.

[0073] As an example, the battery cell assembly 10 can also be housed in the housing 20 by directly fixing multiple battery cells 11 to the housing 20.

[0074] As an example, the housing 20 may include a first part 21 and a second part 22. The first part 21 and the second part 22 are fastened together to form a closed space inside the housing 20 to house the battery cell assembly 10. Here, "closed" refers to covering or closing, and can be either non-sealed or sealed to prevent liquids or other foreign objects from affecting the charging or discharging of the battery cell 11. The first part 21 may be a top cover or a bottom plate.

[0075] As an example, the housing 20 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 the interior of the housing 20 forms an enclosed space to house the battery cell assembly 10.

[0076] In some embodiments, the housing 20 may be part of the vehicle's chassis structure. For example, a portion of the housing 20 may be at least a portion of the vehicle's floor, or a portion of the housing 20 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0077] The battery cell 11 provided in the embodiments of this application can be a secondary battery. A secondary battery refers to a battery cell 11 that can be used again after being discharged by recharging to activate the active material.

[0078] The battery cell 11 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0079] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application. The battery cell 11 refers to the smallest unit that makes up the battery. For example... Figure 3 The battery cell 11 includes an end cap 12, a housing 13, an electrode assembly 14, and other functional components.

[0080] End cap 12 refers to a component that covers the opening of housing 13 to isolate the internal environment of battery cell 11 from the external environment. The shape of end cap 12 can be adapted to the shape of housing 13 to fit it. In some embodiments, end cap 12 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 12 is less prone to deformation under pressure and impact, enabling battery cell 11 to have higher structural strength and improved safety performance. Functional components such as electrode terminals can be provided on end cap 12. Electrode terminals can be used for electrical connection with electrode assembly 14 for outputting or inputting electrical energy to battery cell 11. In some embodiments, end cap 12 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 11 reaches a threshold. The material of end cap 12 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating element may be provided on the inner side of the end cap 12. The insulating element can be used to isolate the electrical connection components within the housing 13 from the end cap 12 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0081] The housing 13 is a component used to cooperate with the end cap 12 to form the internal environment of the battery cell 11. This internal environment can accommodate the electrode assembly 14, electrolyte, and other components. The housing 13 and the end cap 12 can be independent components. An opening can be provided on the housing 13, and the end cap 12 closes the opening to form the internal environment of the battery cell 11. Alternatively, the end cap 12 and the housing 13 can be integrated. Specifically, the end cap 12 and the housing 13 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 13, the end cap 12 closes the housing 13. The housing 13 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 13 can be determined according to the specific shape and size of the electrode assembly 14. The housing 13 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0082] Electrode assembly 14 is the component in the battery cell 11 where the electrochemical reaction takes place. The housing 13 may contain one or more electrode assemblies 14. Electrode assembly 14 is mainly formed by winding and forming positive and negative electrode plates, and a separator is typically provided between the positive and negative electrode plates. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly.

[0083] Figure 4 This is a schematic diagram of the internal partial structure of a battery device provided in some embodiments of this application; Figure 5 for Figure 4 Top view; Figure 6 for Figure 5Sectional view at point AA; Figure 7 for Figure 6 A partial schematic diagram at point B in the middle; Figure 8 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application.

[0084] Please refer to Figures 4 to 8 This application provides a battery device, including: a housing 20, a heat insulation component 600, and a plurality of battery cells 11; the housing 20 includes a protective member 400, a bottom wall 510, and a side wall 520 connected to the bottom wall 510, the bottom wall 510 and the side wall 520 forming a receiving area 530 for accommodating the plurality of battery cells 11, the protective member 400 being connected to the outside of the bottom wall 510 away from the receiving area 530, and a filling space 54 being provided between the protective member 400 and the bottom wall 510. 0; At least one beam 700 is provided inside the box. The beam 700 is connected to the inner side of the bottom wall 510 away from the protective member 400. The beam 700 is used to divide the accommodating area 530 into multiple sub-areas 531. Each sub-area 531 contains at least one battery cell 11. The heat insulation component 600 includes a first heat insulation part 610 and a second heat insulation part 620. The first heat insulation part 610 fills the filling space 540, and the second heat insulation part 620 is disposed between the beam 700 and the bottom wall 510.

[0085] The housing 20 may include a bottom wall 510 and side walls 520, which together form a receiving area 530. The bottom wall 510 may be a plate-like structure, or the side walls 520 may be a plate-like structure or a side beam structure with an internal cavity. The bottom wall 510 can be directly or indirectly connected to the side walls 520 using common methods such as welding, riveting, screwing, or integral molding. The receiving area 530 can have various shapes, such as cylindrical, cuboid, etc.

[0086] The battery cell 11 can be installed in the receiving area 530. It is understood that the battery cell 11 can be directly bonded to the bottom wall 510 by CTP method, thereby improving the energy density of the battery device.

[0087] A protective element 400 may also be provided on the outer side of the bottom wall 510 away from the receiving area 530. The protective element 400 can be a plate-shaped or basin-shaped structure. It is understood that the protective element 400 can be directly or indirectly connected to the bottom wall 510 or the side wall 520 through common methods such as welding, riveting, or screwing. The protective element 400 can protect the battery assembly, for example, preventing objects such as stones from the bottom of the vehicle from directly impacting the bottom wall.

[0088] It is understood that in this embodiment, the protective component 400, the bottom wall 510, and the side wall 520 can constitute the second part 22 of the housing, while the first part 21 can be the top cover of the housing. The protective component 400, the bottom wall 510, and the side wall 520 can all be made of materials such as aluminum, iron, or alloys to improve structural strength. Furthermore, the materials of the three components can be the same or different, depending on the actual situation.

[0089] The heat insulation component 600 includes a first heat insulation portion 610. Please refer to... Figures 7 to 8 A filling space 540 may be provided between the bottom wall 510 and the protective component 400. It is understood that there may be a certain gap between the bottom wall 510 and the protective component 400, which forms the filling space 540. The filling space 540 may be filled with heat-insulating material, thereby forming the first heat-insulating part 610. It is understood that the heat-insulating component may be made of heat-insulating material, such as nano-aerogel.

[0090] In this embodiment, the first heat insulation part 610 can fill the filling space 540 so that it can fully contact the bottom surface of the bottom wall 510 facing the protective member 400, thereby improving the heat insulation effect between the bottom wall 510 and the protective member, thereby preventing the battery cell 11 from directly dissipating heat to the protective member 400 through the bottom wall 510, and improving the heat insulation and heat preservation capability of the battery device.

[0091] According to some embodiments of this application, the thermal conductivity C of the heat insulation component 600 satisfies: C≤0.02W / (m·K), and / or the electrical conductivity D of the heat insulation component 600 satisfies: D<10. -6 S / m.

[0092] The thermal conductivity of the insulation component 600 refers to the amount of heat transferred through a 1-square-meter area in 1 second under stable heat transfer conditions, with a temperature difference of 1 degree Celsius between the two surfaces of a 1-meter-thick material. The unit is watts per (m·K). Thermal conductivity measures the heat insulation capacity of a material.

[0093] In this embodiment, the thermal conductivity C of the heat insulation component 600, for example, the thermal conductivity of the first heat insulation part 610, can be 0.012 W / (m·K), 0.014 W / (m·K), 0.016 W / (m·K), 0.018 W / (m·K), 0.02 W / (m·K), etc. Of course, in other embodiments, the thermal conductivity C of the heat insulation component 600 can also have other ranges, for example, C≤0.018 W / (m·K), or C≤0.01 W / (m·K), or C≤0.015 W / (m·K), etc.

[0094] Furthermore, the electrical conductivity D of the thermal insulation component 600 refers to the material's ability to conduct electric current, and its unit is Siemens per meter (S / m). In this embodiment, the electrical conductivity D of the thermal insulation component 600 can be 10. -7 S / m, 10 -8 S / m, 10 -9 S / m, etc. Of course, in other embodiments, the conductivity D of the thermal insulation component 600 can also have other ranges, for example, D < 10. -7 S / m, or D < 10 - 8 S / m, or D < 10 -9 S / m, etc.

[0095] It is understandable that by using electrical conductivity and thermal conductivity, the heat insulation components can be distinguished from traditional cushioning foam or rubber materials, which can significantly improve the heat preservation time constant of the battery device, make the temperature of the battery cells change to the ambient temperature more slowly, reduce the cost of the thermal management system, and improve the heat insulation and insulation capabilities of the battery device.

[0096] This embodiment improves the thermal insulation performance of the heat insulation component by setting its thermal conductivity to no higher than 0.02 W / (m·K), thereby enhancing the overall thermal insulation performance of the battery device. Furthermore, by setting the electrical conductivity of the heat insulation component to less than 10... - 6 S / m can improve the insulation capacity of thermal insulation components and enhance the safety performance of battery devices, thereby achieving dual protection of thermal and electrical insulation for battery devices while reducing costs.

[0097] In this embodiment, by filling the space between the bottom wall and the protective component with a first heat insulation part, the heat transfer from the battery cell to the bottom wall and then to the protective component can be blocked, thereby reducing heat conduction and heat convection inside and outside the box and extending the heat conduction path from the battery cell to the outside of the box. This enhances the insulation capability of the battery cell against the ambient temperature outside the box and greatly improves the heat insulation capability of the battery device. As a result, the demand for the thermal management system can be reduced, and the power and cost of the thermal management system can be reduced.

[0098] Furthermore, it can be understood that the first heat insulation section can also provide cushioning for the battery device when it is struck by a ball from the bottom, so that less of the ball's energy (such as the impact energy of a stone) is transferred to the bottom wall, improving the bottom wall's susceptibility to impact fracture. At the same time, due to the cushioning effect of the first heat insulation section, the amount of deformation caused by the impact is smaller, eliminating the need for an excessively large buffer and impact protection space (bottom ball space) between the bottom wall and the protective component. This reduces the design requirements for the bottom ball space, thereby increasing the height of the individual battery cells and improving the space utilization and energy density of the battery device.

[0099] Furthermore, since the heat insulation components occupy little space and are lightweight, they do not significantly increase the overall weight of the casing. When applied to CTP battery devices, they can improve battery energy density while also achieving lightweight design and high thermal management efficiency.

[0100] It is understood that in this embodiment, one or more beams 700 may be provided inside the housing 20. The beams 700 may be expansion beams with internal cavities. The beams 700 may also be made of materials such as metal or alloy to improve the structural strength of the battery device.

[0101] The beams 700 can be used to divide the housing area 530 within the box, thereby forming one or more sub-areas and improving the strength of the battery device. In this embodiment, multiple beams 700 can be spaced apart along the maximum expansion direction of the battery cell. While dividing the sub-space, the beams 700 can also provide space for the expansion of the battery cell 11.

[0102] The beam 700 can be set on the side of the bottom wall facing the receiving area 530. It can be connected to the box body by common connection methods, such as welding, screwing, snap-fitting, etc., for example, directly or indirectly connected to the side wall, bottom wall or protective components.

[0103] like Figure 4 In this embodiment, four beams 700 are shown spaced apart along the length of the battery device 100. A sub-region 531 is formed between two adjacent beams 700, and each sub-region accommodates one or more battery cells 11. It is understood that in other embodiments, there may also be sub-regions between the beams 700 and the sidewalls 520, depending on the specific circumstances. Figure 8 The diagram shows two symmetrical beams 700 on both sides of a single battery cell.

[0104] It is understood that the shapes of the various beams 700 in this embodiment can be the same or different, and can be set according to their location and requirements.

[0105] like Figure 7 and Figure 8 The heat insulation component 600 may further include a second heat insulation portion 620, which may be disposed between the beam 700 and the bottom wall 510. It is understood that the beam 700 may have a bottom surface facing the bottom wall 510, and the second heat insulation portion 620 may be disposed between the bottom surface of the beam 700 and the bottom wall 510. The second heat insulation portion may be made of heat-insulating material, which can improve the heat insulation capacity between the beam 700 and the bottom wall 510.

[0106] In this embodiment, by providing a second heat insulation part between the bottom wall and the beam, the heat transfer from the battery cell to the bottom wall through the beam can be reduced, thereby reducing the heat conduction and heat convection between the battery cell and the external environment through the beam, bottom wall, and protective parts, and further improving the heat insulation and heat preservation capabilities of the battery device.

[0107] According to some embodiments of this application, such as Figure 7 and Figure 8 The heat insulation component 600 also includes a third heat insulation part 630, which is provided between the first surface 710 of the beam 700 facing the sub-region 531 and the battery cell 11.

[0108] In this embodiment, the beam 700 has a first surface 710 of the facing sub-region 531. It can be understood that the first surface 710 can be the surface of the beam 700 facing the battery cell 11.

[0109] A third heat insulation section 630 is provided between the first surface 710 and the battery cell 11 contained in the sub-region 531. The third heat insulation section 630 can be made of heat insulation material, which can improve the heat insulation capacity between the beam 700 and the battery cell 11.

[0110] It is understood that in some embodiments, the second heat insulation part and the third heat insulation part are connected to each other to form an integral part, or the second heat insulation part and the third heat insulation part can be two independent components.

[0111] In other embodiments, the outer surface of the beam 700 is covered with a complete heat insulation component. The portion of the heat insulation component located between the beam 700 and the bottom wall 510 constitutes a second heat insulation portion 620, and the portion of the heat insulation component located between the beam 700 and the battery cell 11 constitutes a third heat insulation portion 630. This can further improve the heat insulation capability between the beam 700 and external components, reduce heat dissipation to the external environment of the battery device through the beam, and improve the heat insulation and heat preservation capability.

[0112] In this embodiment, by setting a third heat insulation part between the battery cell and the beam, the heat transfer from the battery cell to the beam can be reduced, thereby reducing the heat conduction and heat convection between the battery cell and the external environment through the beam, bottom wall, and protective parts, and further improving the heat insulation and heat preservation capabilities of the battery device.

[0113] According to some embodiments of this application, please refer to Figure 8 The thickness H1 of the second heat insulation part 620 and the thickness H2 of the third heat insulation part 630 satisfy the condition: H1 > H2.

[0114] In this embodiment, the thickness H1 of the second heat insulation part 620 can be the dimension of the second heat insulation part 620 in the direction perpendicular to the bottom surface of the beam. The thickness H2 of the third heat insulation part 630 can be the dimension of the third heat insulation part in the direction perpendicular to the first surface 710.

[0115] It is understandable that the thickness H1 of the second heat insulation part can be greater than the thickness H2 of the third heat insulation part.

[0116] Since the bottom wall and beam are usually made of materials with good thermal conductivity such as metal, the heat transfer between them is faster. By increasing the thickness of the second heat insulation part between the bottom wall and beam, the heat insulation capacity between the bottom wall and beam can be further improved, thereby improving the heat insulation and heat preservation capacity of the battery device.

[0117] According to some embodiments of this application, please refer to Figure 8 The thickness H1 of the second heat insulation part 620 and the thickness H2 of the third heat insulation part 630 satisfy the condition: H1 / H2 > 2.

[0118] It is understood that in this embodiment, the thickness H1 of the second heat insulation part 620 can be more than twice the thickness H2 of the third heat insulation part 630.

[0119] In other embodiments, the thickness H1 of the second heat insulation portion 620 and the thickness H2 of the third heat insulation portion 630 may have other ratio ranges, such as H1 / H2 > 2.3, H1 / H2 > 2.5, or H1 / H2 > 3, etc.

[0120] In this embodiment, by setting the thickness of the second heat insulation part to be more than twice the thickness of the third heat insulation part, the heat insulation capacity between the bottom wall and the beam can be further improved, the heat conduction path between the bottom wall and the beam can be blocked, thereby improving the heat insulation and heat preservation capacity of the battery device.

[0121] According to some embodiments of this application, such as Figure 8 As shown, the sidewall 520 and the protective member 400 are connected by a first fastener 410, and the head of the first fastener 410 is exposed outside the protective member 400; the heat insulation member 600 includes a fourth heat insulation portion 640, which covers the head of the first fastener 410, and a portion of the fourth heat insulation portion 640 is located between the protective member 400 and the head of the first fastener 410.

[0122] The first fastener 410 can be a screw, bolt, rivet, or other fastener, which can be used to connect the side wall 520 and the protective component 400.

[0123] The first fastener 410 may include a connector and a head. The connector is used to pass through the protective member and connect to the side wall 520. The head may protrude from the circumferential side of the connector, and after fastening, the head may be located outside the protective member 400, i.e., exposed to the external environment of the battery device. Taking the first fastener 410 as a bolt, its head may be the head of a bolt, its connector may be a screw, and the head may protrude circumferentially from the screw.

[0124] In this embodiment, the head of the first fastener 410 may be covered with a fourth heat insulation part 640. The fourth heat insulation part may cover the entire head. Specifically, the fourth heat insulation part 640 may not only cover the part of the head of the first fastener that is directly exposed to the external environment, thereby reducing the heat dissipation of the sidewall directly to the outside through the first fastener, but the fourth heat insulation part may also cover the part of the head of the first fastener that is connected to the protective member 400 (the outer surface of which is away from the receiving area), thereby reducing the heat dissipation of the protective member directly to the outside through the first fastener.

[0125] It is understandable that by setting a fourth heat insulation part, the heat dissipation from the side wall to the outside through the first fastener can be reduced, thereby improving the heat insulation capacity of the heat transfer path from the battery cell through the air inside the box, the side wall, the first fastener to the external environment. At the same time, the fourth heat insulation part can also reduce the heat dissipation from the protective component to the outside through the first fastener, thereby improving the heat insulation effect of the heat transfer path through the protective component and the first fastener to the external environment, reducing heat loss, and improving the heat insulation effect of the battery cell.

[0126] According to some embodiments of this application, such as Figure 8 As shown, the beam 700 and the protective member 400 are connected by a second fastener 420, and the head of the second fastener 420 is exposed outside the protective member 400; the heat insulation member 600 includes a fifth heat insulation part 650, which covers the head of the second fastener 420, and a portion of the fifth heat insulation part 650 is located between the protective member 400 and the head of the second fastener 420.

[0127] Understandable. Figure 8 This is a simplified diagram of the battery device 100, intended to visually demonstrate the internal structure of the battery device 100. Figure 8 Only two beams 700 and a subspace between them are shown in the illustration. In other embodiments, there may be more beams and more subspaces.

[0128] The second fastener 420 can be a screw, bolt, rivet, or other fastener, which can be used to connect the beam 700 and the protective component 400. It can be understood that in this embodiment, the second fastener 420 can pass through the bottom wall 510 and connect to the beam 700. When the bottom wall 510 is a heat exchange component with an internal heat exchange cavity, the second fastener 420 can pass through the non-cavity area of ​​the bottom wall 510.

[0129] The second fastener 420 may include a connector and a head. The connector is used to pass through the protective member and connect to the beam. The head may protrude from the peripheral side of the connector and, after fastening, the head may be located outside the protective member 400, that is, exposed to the external environment of the battery device.

[0130] In this embodiment, the head of the second fastener 420 may be covered with a fifth heat insulation part 650. The fifth heat insulation part may cover the entire head. Specifically, the fifth heat insulation part 650 may not only cover the part of the head of the second fastener that is directly exposed to the external environment, thereby reducing the heat dissipation of the beam directly to the outside through the first fastener, but the fifth heat insulation part may also cover the part of the head of the second fastener that is connected to the protective member 400 (its outer surface facing away from the receiving area), thereby reducing the heat dissipation of the protective member directly to the outside through the second fastener.

[0131] It is understandable that by setting the fifth heat insulation part, the heat dissipation of the beam directly to the outside through the second fastener can be reduced, thereby improving the heat insulation capacity of the heat transfer path from the battery cell through the beam and the second fastener to the external environment. At the same time, the fifth heat insulation part can also reduce the heat dissipation of the protective component directly to the outside through the second fastener, thereby improving the heat insulation effect of the heat transfer path through the protective component and the second fastener to the external environment, reducing heat loss, and improving the heat insulation effect of the battery cell.

[0132] According to some embodiments of this application, please refer to Figure 8 The housing 20 is connected to a third fastener 430, the head of which is exposed outside the housing 20; the heat insulation component 600 includes a sixth heat insulation part 660, which covers the head of the third fastener 430, and a portion of the sixth heat insulation part 660 is located between the housing 20 and the head of the third fastener 430.

[0133] The third fastener 430 can be a screw, bolt, rivet, or other fastener. The head of the third fastener can abut against the outer surface of the housing 20. It can be used to assemble the housing 20. It can be understood that the third fastener 430 can be the first fastener connecting the protective component 400 to the side wall 520, or the second fastener connecting the protective component 400 to the beam 700, or it can be... Figure 8The third fastener 430 shown connects the first part 21 (top cover) and the side wall 520. In this embodiment, the third fastener 430 can be any fastener used to assemble the battery device, with its head exposed to the external environment of the housing.

[0134] Taking the third fastener 430 for connecting the top cover and the side wall 520 as an example, the third fastener 430 may include a connector and a head. The connector is used to pass through the top cover and connect to the side wall 520. The head may protrude from the circumferential side of the connector, and after fastening, the head may be located outside the top cover, that is, exposed to the external environment of the battery device.

[0135] In this embodiment, the head of the third fastener 430 may be covered by a sixth heat insulation part 660. The sixth heat insulation part may cover the entire head. Specifically, the sixth heat insulation part 660 may not only cover the part of the head of the third fastener that is directly exposed to the external environment, thereby reducing the heat dissipation from the side wall to the outside through the third fastener, but the sixth heat insulation part may also cover the part of the head of the third fastener that is connected to the top cover (the outer surface of the top cover facing away from the bottom wall), thereby reducing the heat dissipation from the top cover to the outside through the third fastener, and thus blocking the heat dissipation of the air inside the box to the external environment through the top cover and the first fastener.

[0136] It is understandable that by setting a sixth heat insulation section, the heat loss of air or components inside the box to the external environment through the third fastener can be reduced, thereby reducing heat loss and improving the heat insulation effect of the battery cells.

[0137] The thermal conductivity and electrical conductivity of the first, second, third, fourth, fifth, and sixth heat insulation components in the above embodiments can all meet the parameter ranges of the aforementioned heat insulation components. In some embodiments, the first, second, third, fourth, fifth, and sixth heat insulation components can be made of the same material. Of course, in other embodiments, the first, second, third, fourth, fifth, and sixth heat insulation components can also be made of different materials, or at least partially of the same material, depending on the actual situation.

[0138] According to some embodiments of this application, please refer to Figure 8 The battery device 100 further includes a first heat exchanger 23, the interior of which has a first heat exchange chamber for the flow of heat exchanger, and the first heat exchanger 23 forms a bottom wall 510.

[0139] In this embodiment, the first heat exchanger 23 can serve as the bottom wall 510 of the housing 20, which can be disposed at the bottom of the battery cell 11. The first heat exchanger 23 can have a first heat exchange chamber for the flow of heat exchanger. The shape of the first heat exchange chamber can be various, such as a curved shape, or a cuboid shape, etc.

[0140] The battery cell 11 can be bonded to the first heat exchanger 23, thereby allowing direct heat exchange between the battery cell 11, such as heating or cooling.

[0141] In this embodiment, by setting the first heat exchanger, the first heat exchanger can be directly used as the bottom wall of the housing to exchange heat with the battery cells, thereby improving space utilization and the energy density of the battery device. At the same time, the first heat insulation part can block heat conduction and heat convection between the first heat exchanger and the protective part, providing heat insulation for the battery device, improving the heat preservation performance of the battery device, and reducing the power requirements of the thermal management system, thus reducing costs.

[0142] According to some embodiments of this application, Figure 9 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application.

[0143] Please refer to Figure 9 The battery device 100 further includes a second heat exchanger 24, the second heat exchanger 24 having a second heat exchange chamber for circulating heat exchanger, and the second heat exchanger 24 being disposed between the battery cells 11.

[0144] In this embodiment, Figure 9 Two symmetrical beams 700 on either side of a battery cell are shown. A second heat exchanger 24 is disposed between the battery cells between the beams 700. The bottom wall 510 can be a solid plate, such as an aluminum plate or a steel plate. The battery assembly 100 may include one or more second heat exchangers 24, which can be disposed approximately perpendicular to the bottom wall 510 and can be positioned between the large surfaces of the battery cells 11 to directly cool or heat the battery cells.

[0145] Alternatively, the second heat exchanger 24 can also be connected to the bottom wall 510 of the housing using conventional connection methods, such as screwing, welding, or bonding. The second heat exchanger 24 may have a second heat exchange chamber for the flow of heat exchanger, and the shape of the second heat exchange chamber can be various, such as a curved shape or a cuboid shape, etc.

[0146] In this embodiment, by setting a second heat exchanger, it can come into contact with a large surface of the battery cell, thereby exchanging heat with the battery cell and improving the heat exchange effect. At the same time, the first heat insulation part can block heat conduction and heat convection between the bottom wall and the protective part, providing heat insulation for the battery device, improving the heat preservation performance of the battery device, and reducing the power requirements of the thermal management system, thus reducing costs.

[0147] This application provides an electrical device, which includes the battery device 100 in the above embodiments, and the battery device 100 is used to provide electrical energy.

[0148] Electrical devices include vehicles (such as cars, electric vehicles, ships, spacecraft, etc.), display devices (such as mobile phones, tablets, laptops, etc.), electric toys, power tools, etc.

[0149] It is understood that the electrical device provided in this application, by using any of the aforementioned battery devices 100, has all the beneficial effects of the aforementioned battery devices 100, which will not be elaborated here.

[0150] This application provides an energy storage device, which includes the battery device 100 in the above embodiments, and the battery device 100 is used to store electrical energy.

[0151] Energy storage devices can include, but are not limited to, centralized energy storage devices (such as containerized energy storage devices), distributed energy storage devices, mobile energy storage devices, wearable energy storage devices, and so on.

[0152] It is understood that the energy storage device provided in this application, by using any of the aforementioned battery devices 100, has all the beneficial effects of the aforementioned battery devices 100, which will not be elaborated here.

[0153] Please refer to Figures 4 to 8This application provides a battery device, including: a housing 20, a heat insulation component 600, and a plurality of battery cells 11; the housing 20 includes a protective component 400, a bottom wall 510, and a side wall 520 connected to the bottom wall 510, the bottom wall 510 and the side wall 520 forming a receiving area 530 for accommodating a plurality of battery cells 11, the protective component 400 is connected to the outside of the bottom wall 510 away from the receiving area 530, and there is a filling space 540 between the protective component 400 and the bottom wall 510; the heat insulation component 600 includes a first heat insulation part 610, the first heat insulation part 610 filling the filling space 540. The housing contains at least one beam 700, which is connected to the inner side of the bottom wall 510 away from the protective member 400. The beam 700 is used to divide the accommodating area 530 into multiple sub-areas 531, each sub-area 531 containing at least one battery cell 11. The heat insulation member 600 also includes a second heat insulation part 620 and a third heat insulation part 630. The second heat insulation part 620 is disposed between the beam 700 and the bottom wall 510, and the third heat insulation part 630 is disposed between the first surface 710 of the beam 700 facing the sub-area 531 and the battery cell 11.

[0154] In this embodiment, by filling the space between the bottom wall and the protective component with a first heat insulation part, the heat transfer from the battery cell to the bottom wall and then to the protective component can be blocked, thereby reducing heat conduction and heat convection inside and outside the box and extending the heat conduction path from the battery cell to the outside of the box. This enhances the insulation capability of the battery cell against the ambient temperature outside the box and greatly improves the heat insulation capability of the battery device. As a result, the demand for the thermal management system can be reduced, and the power and cost of the thermal management system can be reduced.

[0155] By setting a second heat insulation section between the bottom wall and the beam, the heat transfer from the battery cell to the bottom wall through the beam can be reduced, thereby reducing the heat conduction and heat convection between the battery cell and the external environment through the beam, bottom wall, and protective components. By setting a third heat insulation section between the battery cell and the beam, the heat transfer from the battery cell to the beam can be reduced, thereby reducing the heat conduction and heat convection between the battery cell and the external environment through the beam, bottom wall, and protective components, further improving the heat insulation and heat preservation capabilities of the battery device.

[0156] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Multiple battery cells; The housing includes a protective member, a bottom wall, and a side wall connected to the bottom wall. The bottom wall and the side wall form a receiving area for accommodating the plurality of battery cells. The protective member is connected to the outside of the bottom wall away from the receiving area, and there is a filling space between the protective member and the bottom wall. At least one beam is provided inside the housing. The beam is connected to the inside of the bottom wall away from the protective member. The beam is used to divide the receiving area into a plurality of sub-areas, and each sub-area accommodates at least one of the battery cells. The heat insulation component includes a first heat insulation part and a second heat insulation part, wherein the first heat insulation part fills the filling space and the second heat insulation part is disposed between the beam and the bottom wall.

2. The battery device according to claim 1, characterized in that, The heat insulation component further includes a third heat insulation part, which is disposed between the first surface of the beam facing the sub-region and the battery cell.

3. The battery device according to claim 2, characterized in that, The thickness H1 of the second heat insulation part and the thickness H2 of the third heat insulation part satisfy the condition: H1 > H2.

4. The battery device according to claim 2, characterized in that, The thickness H1 of the second heat insulation part and the thickness H2 of the third heat insulation part satisfy the condition: H1 / H2 > 2.

5. The battery device according to any one of claims 1-4, characterized in that, The sidewall and the protective member are connected by a first fastener, and the head of the first fastener is exposed outside the protective member; The heat insulation component includes a fourth heat insulation portion that covers the head of the first fastener, and a portion of the fourth heat insulation portion is located between the protective component and the head of the first fastener.

6. The battery device according to any one of claims 1-4, characterized in that, The beam and the protective member are connected by a second fastener, and the head of the second fastener is exposed outside the protective member; The heat insulation component includes a fifth heat insulation portion that covers the head of the second fastener, and a portion of the fifth heat insulation portion is located between the protective component and the head of the second fastener.

7. The battery device according to any one of claims 1-4, characterized in that, The housing is connected to a third fastener, the head of which is exposed outside the housing; the heat insulation component includes a sixth heat insulation portion, which covers the head of the third fastener, and a portion of the sixth heat insulation portion is located between the housing and the head of the third fastener.

8. The battery device according to any one of claims 1-4, characterized in that, The thermal conductivity C of the insulation component satisfies: C ≤ 0.02 W / (m·K), and / or, The electrical conductivity D of the heat insulation component satisfies: D < 10 -6 S / m.

9. The battery device according to any one of claims 1-4, characterized in that, Also includes: The first heat exchanger has a first heat exchange chamber inside for the flow of heat exchanger, and the first heat exchanger forms the bottom wall.

10. The battery device according to any one of claims 1-4, characterized in that, Also includes: The second heat exchanger has a second heat exchange chamber inside for the flow of heat exchanger, and the second heat exchanger is disposed between the battery cells.

11. An electrical appliance, characterized in that, The electrical device includes a battery device as described in any one of claims 1-10, the battery device being used to provide electrical energy.

12. An energy storage device, characterized in that, The energy storage device includes a battery device as described in any one of claims 1-10, the battery device being used to store electrical energy.

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