Battery device, power utilization device and charging equipment

Abstract

The embodiment of the utility model discloses a battery device, a power utilization device and charging equipment. The battery device comprises a box body which is provided with an accommodating space and comprises a first wall; a battery cell accommodated in the accommodating space; the heat conduction piece is arranged on the surface, close to the first wall, of the battery monomer and is connected with the battery monomer; the heat conduction piece and the first wall are arranged at an interval. According to the battery device, the power utilization device and the charging equipment provided by the embodiment of the invention, the stability of the battery device can be improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery device, an electrical device, and a charging device. Background Technology

[0002] With the rapid development of new energy vehicles, energy storage systems, and other fields, battery devices, as core energy supply units, are facing increasingly diverse operating environments. In practical applications, battery devices must withstand complex and variable environmental temperature conditions, with both high and low temperatures severely impacting their performance. Therefore, maintaining the stability of battery devices under different temperature conditions is a pressing technical problem that needs to be solved. Utility Model Content

[0003] This application provides a battery device, a power supply device, and a charging device, which can improve the stability of the battery device.

[0004] In a first aspect, this application provides a battery device, comprising: a housing having a receiving space and including a first wall; a battery cell receiving the receiving space; and a heat-conducting element disposed on the surface of the battery cell near the first wall and connected to the battery cell; the heat-conducting element being spaced apart from the first wall.

[0005] In the technical solution of this application embodiment, by setting a heat-conducting element on the surface of the battery cell and spacing the heat-conducting element from the first wall of the housing, the heat insulation function can be achieved; in addition, when heat exchange is required, pressure can be applied to the first wall to make the first wall contact the heat-conducting element to achieve heat exchange, thus enabling the battery device to operate stably under different temperature environments.

[0006] In some embodiments of the first aspect, the battery device further includes an elastic member disposed on the surface of the battery cell near the first wall and abutting against the battery cell and the first wall respectively, wherein the elastic member does not coincide with the orthographic projection of the thermal conductive member on the first wall.

[0007] In the technical solution of this application embodiment, by setting an elastic element, on the one hand, it can support the first wall and the heat-conducting element, ensuring that there is a certain gap between the first wall and the heat-conducting element, thereby achieving heat preservation and reducing heat loss caused by direct contact between the heat-conducting element and the first wall in non-heat exchange state; on the other hand, when the temperature is high, the gap between the first wall and the heat-conducting element can be reduced by compressing the elastic element, or the first wall and the heat-conducting element can be in direct contact, thereby conducting internal heat out, so that the battery device is in a suitable temperature range, thus ensuring that the battery device operates stably in different temperature environments.

[0008] In some embodiments of the first aspect, the elastic member is disposed on at least one side of the heat-conducting member along a direction parallel to the first wall and is in close contact with the heat-conducting member.

[0009] In the technical solution of this application embodiment, by setting the elastic element close to the heat-conducting element, the gap between the battery cell and the first wall can be better supported, reducing the contact between the first wall and the heat-conducting element caused by external unrelated impact forces in the non-heat exchange state, thereby improving the overall operational stability of the battery device.

[0010] In some embodiments of the first aspect, the battery device further includes a thermal pad disposed between the thermally conductive member and the first wall, wherein the thermal conductivity of the thermal pad at a first temperature is greater than the thermal conductivity of the thermal pad at a second temperature, and the first temperature is greater than the second temperature.

[0011] In the technical solution of this application embodiment, by setting a thermal pad, the thermal pad has the characteristics of relatively high thermal conductivity at high temperature and relatively low thermal conductivity at low temperature, which enables the battery device to improve heat dissipation efficiency at high temperature and improve heat preservation effect at low temperature, thereby maintaining the battery device within a relatively stable temperature range and improving the stability of battery device operation.

[0012] In some embodiments of the first aspect, the thermal pad is spaced apart from either the thermal conductive element or the first wall.

[0013] In the technical solution of this application embodiment, the overall heat preservation effect of the battery device can be further improved in the non-heat exchange state; in the heat exchange state, the first wall can be made to contact the heat conduction pad through external pressure, thereby forming a heat dissipation path from the heat of the battery cell through the heat conduction component, the heat conduction pad and the first wall to the outside of the box, thereby improving the operating performance of the battery device under different temperature environments.

[0014] In some embodiments of the first aspect, the thermal conductivity λ1 of the thermal pad is related to the temperature t in the following ways: when the temperature t satisfies -20° ≤ t ≤ 0°, the thermal conductivity λ1 satisfies: 0.02 W / (m•K) ≤ λ1 ≤ 0.1 W / (m•K); or when the temperature t satisfies 0° ≤ t ≤ 25°, the thermal conductivity λ1 satisfies: 0.1 W / (m•K) ≤ λ1 ≤ 5 W / (m•K); or when the temperature t satisfies 25° ≤ t ≤ 45°, the thermal conductivity λ1 satisfies: 5 W / (m•K) ≤ λ1 ≤ 10 W / (m•K); or when the temperature t satisfies 45° ≤ t ≤ 50°, the thermal conductivity λ1 satisfies: 10 W / (m•K) ≤ λ1 ≤ 200 W / (m•K).

[0015] In the technical solution of this application embodiment, by setting the relationship between the thermal conductivity of the heat-conducting pad and the temperature, the battery device can improve heat dissipation efficiency at high temperatures and improve heat preservation effect at low temperatures, thereby maintaining the battery device within a relatively stable temperature range and improving the stability of the battery device operation.

[0016] In some embodiments of the first aspect, the thermal pad includes a matrix and a filler, the matrix being made of a material selected from polyurethane, acrylic acid, paraffin wax, polyethylene glycol, fatty acid, and epoxy resin, and the filler being made from a material selected from graphene, boron nitride, metal, carbon fiber, and alumina.

[0017] In the technical solutions of this application embodiment, polyurethane, acrylic acid, paraffin, polyethylene glycol, fatty acids and other materials with phase change function, epoxy resin and polyurethane have shape memory function, so they can be used as the support structure of the thermal pad. Graphene, boron nitride, metal, carbon fiber, alumina and other materials are high thermal conductivity materials, so they can be used as fillers to fill the pores of the matrix to form a complete thermal pad material, thereby achieving the thermal pad with the lowest thermal conductivity at low temperature to achieve the heat preservation function, and the high thermal conductivity at high temperature to achieve the heat conduction function.

[0018] In some embodiments of the first aspect, the battery device includes a battery cell assembly comprising a plurality of battery cells arranged along a first direction; the heat-conducting element extends along the first direction and is connected to the plurality of battery cells; the first direction is parallel to the first wall.

[0019] In the technical solution of this application embodiment, by setting a heat-conducting component that extends along the direction of the arrangement of multiple battery cells, the heat-conducting component can connect multiple battery cells. On the one hand, it can balance the temperature difference between multiple battery cells, prevent local overheating, thereby extending the service life of the battery device and improving the reliability of the battery device; on the other hand, the heat-conducting component can constrain the expansion of multiple battery cells and improve the structural strength of the battery device.

[0020] In some embodiments of the first aspect, the battery device includes a plurality of battery cell assemblies arranged along a second direction and a plurality of heat-conducting elements spaced apart along the second direction, with adjacent battery cell assemblies connected to the same heat-conducting element, the second direction being parallel to the first wall and perpendicular to the first direction.

[0021] In the technical solution of this application embodiment, two adjacent battery cell assemblies are connected to the same heat-conducting component, so that the heat-conducting component can be set on the shoulder of the battery cell assembly. Since the shoulder is usually relatively flat, the heat-conducting component can be better attached to the surface of the battery cell, thereby improving the thermal conductivity of the heat-conducting component. Multiple heat-conducting components are spaced apart along the second direction, which can save materials compared to a whole heat-conducting plate. Especially when the electrode terminals of the battery cell face the first wall, the heat-conducting component can avoid the electrode terminals and can be accommodated in the space formed by the height of the electrode terminals themselves, thereby improving the energy density of the battery device.

[0022] In some embodiments of the first aspect, the battery device further includes an end plate extending along the second direction, the end plate being received in the receiving space and abutting against the end of the battery cell assembly along the first direction; the end plate is connected to the housing and the end plate is connected to the heat-conducting element.

[0023] In the technical solution of this application embodiment, by setting an end plate and connecting the end plate to the heat-conducting component and the housing respectively, on the one hand, the stability of the heat-conducting component connection can be improved, reducing the loosening of the heat-conducting component due to the shaking of the battery device, ensuring effective contact between the heat-conducting component and the battery cell, and improving the heat transfer performance; on the other hand, it can resist the expansion force of the battery cell, reduce the risk of the battery cell assembly moving or deforming due to the expansion force, and improve the overall structural stability of the battery device.

[0024] In some embodiments of the first aspect, the battery device includes a plurality of thermal pads extending along the first direction, and the plurality of thermal pads are disposed in correspondence with a plurality of thermal conductive elements; and / or the battery device includes a plurality of elastic elements extending along the first direction, and each of the plurality of thermal conductive elements is provided with the elastic element on at least one side along the second direction.

[0025] In the technical solution of this application embodiment, by setting multiple elastic elements and / or multiple thermal pads, it is possible to ensure that different areas inside the battery device have good heat preservation and heat dissipation performance, thereby further improving the operational stability of the battery device under different temperature environments.

[0026] In some embodiments of the first aspect, the heat-conducting element has a cavity structure.

[0027] In the technical solution of this application embodiment, the heat-conducting component is set as a cavity structure. Especially when the heat-conducting component connects multiple battery cells, it can improve the ability to resist the expansion force of the battery cells. In addition, it can also reduce the weight of the heat-conducting component and improve the lightweighting of the battery device.

[0028] In some embodiments of the first aspect, the thermal conductivity λ2 of the heat-conducting element satisfies: 10W / (m•K)≤λ2≤500W / (m•K).

[0029] In the technical solution of this application embodiment, the thermal conductivity λ2 of the heat-conducting component is set to be within this range, which can ensure that the heat-conducting component has good thermal conductivity, thereby ensuring that the heat dissipation performance of the battery device is improved in the heat exchange state.

[0030] In some embodiments of the first aspect, the heat-conducting element is a metal plate, and the material of the heat-conducting element includes one of copper, copper alloy, aluminum, aluminum alloy, and stainless steel.

[0031] In the technical solutions of this application embodiment, copper, copper alloys, aluminum, aluminum alloys, and stainless steel have good thermal conductivity and a certain structural strength, which can improve the overall structural stability and operating performance of the battery device.

[0032] In some embodiments of the first aspect, the thermal conductivity λ3 of the first wall satisfies: 10 W / (m•K) ≤ λ3 ≤ 500 W / (m•K).

[0033] In the technical solution of this application embodiment, the thermal conductivity λ3 of the first wall is set to be within this range, so that the first wall has good thermal conductivity, thereby ensuring that the heat inside the battery device can be quickly conducted out during heat exchange, and improving the heat dissipation performance of the battery device.

[0034] In some embodiments of the first aspect, the thermally conductive element is bonded to the battery cell by a thermally conductive adhesive, the thermal conductivity λ4 of which satisfies: 0.1W / (m•K)≤λ4≤20W / (m•K).

[0035] In the technical solution of this application embodiment, the thermally conductive adhesive can fix the thermally conductive component and the battery cell together, and the thermally conductive adhesive also has a certain thermal conductivity, so that heat can be quickly transferred between the battery cell and the thermally conductive component, thereby improving the heat dissipation performance of the battery device in the heat exchange state.

[0036] In a second aspect, an electrical device is provided, including a battery device as described in the first aspect or any embodiment thereof, the battery device being used to provide electrical energy.

[0037] Thirdly, a charging device is provided, including a mounting platform for placing a battery device as described in the first aspect or any embodiment of the first aspect; the mounting platform is provided with a heat exchange component, and when the battery device is placed on the mounting platform, the first wall abuts against the heat exchange component.

[0038] In the technical solution of this application embodiment, under heat exchange conditions, the heat inside the battery device can be removed through the heat exchange component, thereby further improving the heat dissipation efficiency of the battery device.

[0039] In some embodiments of the third aspect, the battery device includes an elastic member that is compressed when the first wall abuts against the heat exchange component, so that the first wall contacts the heat conduction component.

[0040] In the technical solution of this application embodiment, elastic elements are used for support to reduce unnecessary heat loss caused by the first wall contacting the heat-conducting element in a non-heat-exchange state, thereby ensuring the stable operation of the battery device.

[0041] In some embodiments of the third aspect, the heat exchange component includes a flow channel plate and a thermal pad, the thermal pad being disposed on the side of the flow channel plate facing the first wall.

[0042] In the technical solution of this application embodiment, the heat exchange component abuts against the first wall of the battery device through a thermally conductive pad, which can ensure effective contact between the heat exchange component and the first wall, thereby improving the overall heat exchange performance. Attached Figure Description

[0043] Figure 1 A schematic diagram of the structure of a vehicle according to an embodiment of this application is shown;

[0044] Figure 2 An exploded view of a battery device according to an embodiment of this application is shown;

[0045] Figure 3 A top view of a battery device according to an embodiment of this application is shown;

[0046] Figure 4 As shown Figure 3 The battery device shown is a cross-sectional view along section line A-A'.

[0047] Figure 5 As shown Figure 4 The image shows an enlarged view of a battery device at point B.

[0048] Figure 6 As shown Figure 4 Another enlarged view of the battery device shown at point B;

[0049] Figure 7 As shown Figure 4 The battery device shown is another enlarged view at part B;

[0050] Figure 8 A schematic diagram of the structure of a charging device according to an embodiment of this application is shown.

[0051] The accompanying drawings are not drawn to scale.

[0052] The labels for each figure are as follows:

[0053] Vehicle 1; Battery unit 10; Housing 11; First wall 101; Thermal conductive component 12; Elastic component 13; Thermal conductive pad 14; Battery cell assembly 15; End plate 16; Thermal conductive adhesive 17; Battery cell 20; Controller 30; Motor 40; Charging equipment 200; Mounting platform 210; Heat exchange component 220; Charging module 230. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0055] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0056] In this application, the reference to "embodiment" means that a specific 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 mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0057] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0058] 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, P and / or Q can represent three cases: P existing alone, P and Q existing simultaneously, and Q existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0059] In the embodiments of this application, the same reference numerals denote 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 this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0060] In this application, "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).

[0061] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0062] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0063] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0064] The battery cell 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.

[0065] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0066] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0067] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0068] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0069] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0070] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0071] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0072] In some embodiments, the battery device may be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within a cover.

[0073] In some embodiments, the housing in this application can be part of the vehicle's chassis structure. For example, a portion of the housing can be at least a part of the vehicle's floor, or a portion of the housing can be at least a part of the vehicle's crossbeams and longitudinal beams.

[0074] In the new energy industry, battery technology is a crucial factor in its development, especially the reliability of power batteries, which directly impacts the widespread adoption of key applications such as electric vehicles and energy storage systems. However, in practical applications, battery devices face complex and variable environmental temperature conditions, with both high and low temperatures severely impacting their performance. Therefore, maintaining the stability of battery devices under different temperature environments is a pressing technical problem that needs to be solved.

[0075] This application provides a battery device, a power-consuming device, and a charging device, which can solve the above-mentioned problems. The battery device of this application includes a housing, a battery cell, and a heat-conducting component; wherein, the housing has a receiving space and includes a first wall; the battery cell is received in the receiving space; the heat-conducting component is disposed on the surface of the battery cell near the first wall and connected to the battery cell; the heat-conducting component is spaced apart from the first wall.

[0076] In this embodiment, by setting a heat-conducting element on the surface of the battery cell and spacing the heat-conducting element from the first wall of the housing, the heat insulation function can be achieved. In addition, when heat exchange is required, pressure can be applied to the first wall to make the first wall contact the heat-conducting element and achieve heat exchange. This enables the battery device to operate stably under different temperature environments.

[0077] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0078] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0079] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0080] For example, such as Figure 1The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 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 motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0081] Figure 2 An exploded view of the battery device 10 according to an embodiment of this application is shown; Figure 3 As shown Figure 2 A top view of the battery device 10 after assembly along direction Z; Figure 4 As shown Figure 3 A schematic cross-sectional view of the battery device 10 shown along section line A-A'.

[0082] like Figures 2 to 4 As shown, the battery device 10 of this application embodiment may include: a housing 11, a battery cell 20, and a heat-conducting component 12; wherein, the housing 11 has a receiving space and includes a first wall 101; the battery cell 20 is received in the receiving space; the heat-conducting component 12 is disposed on the surface of the battery cell 20 near the first wall 101 and is connected to the battery cell 20; the heat-conducting component 12 is spaced apart from the first wall 101.

[0083] For ease of description, this application primarily uses a near-rectangular-pitch battery device 10 as an example. Furthermore, based on this rectangular-pitch battery device 10, this application defines three reference directions. The length direction of the battery device 10 is the first direction X, the width direction is the second direction Y, and the height direction is the third direction Z. The width, length, and height directions of the battery device 10 are perpendicular to each other, and the width dimension of the battery device 10 is smaller than its length dimension.

[0084] The battery device 10 of this application embodiment may include a housing 11. The housing 11 can be any structure with a accommodating space, so that the battery cells 20 can be accommodated inside the housing 11. For example, the interior of the housing 11 can be a hollow structure, and multiple battery cells 20 can be accommodated inside the housing 11. The housing 11 can be a single integral piece, or it can be composed of multiple separate structures assembled together.

[0085] For example, in some embodiments, the housing 11 may include two parts, namely a first housing part and a second housing part, which are fastened together. The shapes of the first housing part and the second housing part may be determined according to the shape of the components housed inside, for example, according to the shape of a combination of multiple battery cells 20 housed inside. At least one of the first housing part and the second housing part has an opening.

[0086] For example, in some embodiments, the housing 11 may include three or more parts. For instance, the housing 11 includes a cover, a frame, and a bottom. The frame has two openings that are disposed opposite each other. The cover and the bottom cover the two openings respectively, and a plurality of battery cells 20 are accommodated in the housing space formed by the cover, the frame, and the bottom.

[0087] In some embodiments, the housing 11 may include a first wall 101. It should be understood that the first wall 101 can be any wall of the housing 11; for example, the first wall 101 can be the top wall, bottom wall, or side wall of the housing 11. The first wall 101 can be an integrally formed part of the housing 11, or it can be a separate part of the housing 11 connected to other parts of the housing 11. For example, the first wall 101 can be a cover plate of the housing 11, covering the top of the housing 11. As another example, the first wall 101 can be a bottom plate of the housing 11, located at the bottom of the housing 11, for protecting and / or supporting the battery cells.

[0088] The battery cell assembly 15 of this application embodiment may include one or more battery cells 20. In addition, the shape of the battery cell 20 in this application embodiment can be set according to the actual application. For example, the battery cell 20 can be cylindrical, or it can be cuboid or other shapes. This application embodiment is not limited to this.

[0089] In some embodiments, to improve the space utilization within the battery device 10, the battery cells 20 within the battery device 10 are typically arranged in a certain pattern. For example, as... Figure 2 As shown, the battery device 10 may include a plurality of battery cells 20 arranged along the first direction X; further, if the number of battery cells 20 in the battery device 10 is large, the battery device 10 may also include a plurality of battery cell assemblies 15 arranged along the second direction Y.

[0090] In some embodiments, the battery device 10 may include a heat-conducting element 12. The heat-conducting element 12 may be disposed on the surface of the battery cell 20 and connected to the battery cell 20, thereby being able to transfer heat from the surface of the battery cell 20.

[0091] It should be understood that the heat-conducting element 12 can be disposed on the surface of the battery cell 20 in any direction, as long as heat conduction can be achieved, and the embodiments of this application are not limited thereto.

[0092] The heat-conducting component 12 can be disposed on the surface of the battery cell 20 near the first wall 101. That is, by disposing of the heat-conducting component 12 on the surface of the battery cell 20 near the casing wall, the heat transfer path between the battery cell 20 and the casing 11 can be shortened. When the internal temperature of the battery device 10 is relatively high, the internal heat can be quickly transferred to the casing 11 through the heat-conducting component 12, and then transferred to the outside of the casing 11, thereby improving the heat dissipation efficiency.

[0093] In some embodiments, the heat-conducting element 12 may be spaced apart from the first wall 101. That is, there is a gap between the heat-conducting element 12 and the first wall 101, thereby achieving the function of heat preservation. In addition, pressure can be applied to the first wall 101 to reduce the distance between the heat-conducting element 12 and the first wall 101, thereby conducting the heat of the battery cell 20 to the outside of the casing when the temperature is high, thus achieving the function of heat dissipation.

[0094] It should be understood that other heat-conducting structures can also be provided between the heat-conducting component 12 and the first wall 101. It is only necessary to ensure that there is an air gap in the shortest heat transfer path between the heat-conducting component 12 and the first wall 101, so as to achieve heat preservation at low temperature and heat conduction at high temperature, thereby improving the stability of the operation of the battery device 10.

[0095] In this embodiment, by providing a heat-conducting element 12 on the surface of the battery cell 20 and spaced the heat-conducting element 12 from the first wall 101 of the housing 11, the heat insulation function can be achieved. In addition, when heat exchange is required, pressure can be applied to the first wall 101 to make the first wall 101 contact the heat-conducting element 12 to achieve heat exchange, thus enabling the battery device 10 to operate stably under different temperature environments.

[0096] It should be understood that the heat exchange state in the embodiments of this application can refer to a state where the temperature of the battery device 10 is relatively high and heat dissipation is required, such as the charging state or the rapid temperature rise during thermal runaway. The non-heat exchange state in the embodiments of this application can refer to a state where the temperature of the battery device 10 is at the normal operating temperature or at a low temperature. Especially at low temperatures, heat preservation is required to ensure the stable operation of the battery device 10. The description of the heat exchange state and the non-heat exchange state is also applicable to the subsequent embodiments and will not be repeated hereafter.

[0097] The heat-conducting component 12 can be a plate with certain thermal conductivity. The structure and material of the heat-conducting component 12 are not limited in the embodiments of this application.

[0098] In some embodiments, the thermal conductivity λ2 of the heat-conducting element 12 can satisfy: 10W / (m•K)≤λ2≤500W / (m•K). Setting the thermal conductivity λ2 of the heat-conducting element 12 within this range ensures that the heat-conducting element 12 has good thermal conductivity, thereby ensuring improved heat dissipation performance of the battery device 10 under heat exchange conditions.

[0099] Specifically, the thermal conductivity λ2 of the heat-conducting element 12 can be any of the following values ​​or between any of the following values: 10 W / (m•K), 15 W / (m•K), 45 W / (m•K), 50 W / (m•K), 60 W / (m•K), 100 W / (m•K), 120 W / (m•K), 150 W / (m•K), 200 W / (m•K), 237 W / (m•K), 250 W / (m•K), 300 W / (m•K), 350 W / (m•K), 385 W / (m•K), 390 W / (m•K), 398 W / (m•K), 400 W / (m•K), 450 W / (m•K), 500 W / (m•K).

[0100] In some embodiments, the heat-conducting element 12 can be a metal plate, and the material of the heat-conducting element 12 can be one or more of the following: copper, copper alloy, aluminum, aluminum alloy, and stainless steel. Copper, copper alloy, aluminum, aluminum alloy, and stainless steel have good thermal conductivity and a certain structural strength, which can improve the overall structural stability and operating performance of the battery device 10.

[0101] In some embodiments, copper may include oxygen-free copper.

[0102] In some embodiments, the heat conductor 12 has a cavity structure, which can improve the ability to resist the expansion force of the battery cells 20, especially when the heat conductor 12 is connected to multiple battery cells 20. In addition, it can reduce the weight of the heat conductor 12 and improve the lightweighting of the battery device 10.

[0103] In some embodiments, the thermal conductivity λ3 of the first wall can satisfy: 10W / (m•K)≤λ3≤500W / (m•K). Setting the thermal conductivity λ3 of the first wall 101 to be within this range ensures that the first wall 101 has good thermal conductivity, thereby ensuring that the heat inside the battery device 10 can be quickly conducted away during heat exchange, thus improving the heat dissipation performance of the battery device 10.

[0104] Specifically, the thermal conductivity λ3 of the first wall 101 can be any of the following values ​​or between any of the following values: 10 W / (m•K), 15 W / (m•K), 40 W / (m•K), 45 W / (m•K), 50 W / (m•K), 60 W / (m•K), 100 W / (m•K), 120 W / (m•K), 150 W / (m•K), 200 W / (m•K), 237 W / (m•K), 250 W / (m•K), 300 W / (m•K), 350 W / (m•K), 385 W / (m•K), 390 W / (m•K), 398 W / (m•K), 400 W / (m•K), 450 W / (m•K), 500 W / (m•K).

[0105] In some embodiments, the first wall 101 may be an aluminum plate, a galvanized steel plate, or the like.

[0106] Figures 5 to 7 Partial enlarged views of several battery devices 10 according to embodiments of this application are shown. For example, Figures 5 to 7 They are shown respectively as follows Figure 4 Enlarged views of several parts B of the battery device 10 shown.

[0107] In some embodiments, refer to Figures 2 to 7 The battery device 10 may also include an elastic element 13, which is disposed on the surface of the battery cell 20 near the first wall 101 and abuts against the battery cell 20 and the first wall 101 respectively. The elastic element 13 and the orthographic projection of the heat-conducting element 12 on the first wall 101 do not coincide.

[0108] It should be understood that the elastic element 13 can be compressed or stretched through a certain deformation and can return to its initial state.

[0109] The elastic element 13 can be disposed between the battery cell 20 and the first wall 101, and in contact with the battery cell 20 and the first wall 101 respectively. It should be understood that the elastic element 13 can just be in contact with the battery cell 20 and the first wall 101, or the elastic element 13 can be compressed to make pressure contact with the battery cell 20 and the first wall 101.

[0110] The elastic element 13 can be positioned anywhere on the surface of the battery cell 20 except for the heat-conducting element 12, meaning that the orthographic projection of the elastic element 13 and the heat-conducting element 12 onto the first wall 101 does not coincide. The elastic element 13 can provide support for the gap between the heat-conducting element 12 and the first wall 101, thereby reducing heat loss due to contact between the heat-conducting element 12 and the first wall 101 in a non-heat-exchange state. Furthermore, when heat exchange is required, external pressure can be applied to the first wall 101 and the elastic element 13, causing the elastic element 13 to be compressed, thus allowing the heat-conducting element 12 to directly contact the first wall 101 for heat dissipation.

[0111] It should be understood that the elastic element 13 can be disposed on one or both sides of the heat-conducting element 12 in any direction parallel to the first wall 101. The specific positional relationship between the elastic element 13 and the heat-conducting element 12 in this embodiment is not limited to this.

[0112] In the direction perpendicular to the first wall 101, the thickness of the elastic element 13 can be greater than the thickness of the heat-conducting element 12, so that the elastic element 13 can effectively support the first wall 101, prevent the first wall 101 from contacting the heat-conducting element 12 in the non-heat exchange state, thus preventing heat loss and improving the heat preservation effect of the battery device 10 in the low temperature state.

[0113] In this embodiment, by providing the elastic element 13, on the one hand, it can support the first wall 101 and the heat-conducting element 12, ensuring that there is a certain gap between the first wall 101 and the heat-conducting element 12, thereby achieving heat preservation and reducing heat loss caused by direct contact between the heat-conducting element 12 and the first wall 101 in a non-heat-exchange state; on the other hand, when the temperature is high, the elastic element 13 can be compressed to reduce the gap between the first wall 101 and the heat-conducting element 12, or the first wall 101 and the heat-conducting element 12 can be in direct contact, thereby conducting internal heat out, so that the battery device 10 is within a suitable temperature range, thus ensuring that the battery device 10 operates stably under different temperature environments.

[0114] In some embodiments, the elastic member 13 may be disposed on at least one side of the heat-conducting member 12 along a direction parallel to the first wall 101 and in close contact with the heat-conducting member 12.

[0115] It should be understood that the direction parallel to the first wall 101 can be any direction on a plane perpendicular to the third direction Z, and the embodiments of this application are not limited thereto.

[0116] For example, such as Figure 4 As shown, the elastic element 13 can be disposed on any one or both sides of the heat-conducting element 12 along the second direction Y.

[0117] For example, the elastic element 13 can be disposed on any one or both sides of the heat-conducting element 12 along the first direction X.

[0118] In the direction in which the elastic element 13 and the heat-conducting element 12 are arranged side by side, there may be a certain distance between the elastic element 13 and the heat-conducting element 12, or they may be in close contact.

[0119] The elastic element 13 is in close contact with the heat-conducting element 12, that is, the distance between the elastic element 13 and the heat-conducting element 12 in the side-by-side arrangement direction is infinitely close to zero, so that the elastic element 13 is close to one or both sides of the heat-conducting element 12.

[0120] In this embodiment, by setting the elastic element 13 close to the heat-conducting element 12, the gap between the battery cell 20 and the first wall 101 can be better supported, reducing the contact between the first wall 101 and the heat-conducting element 12 caused by external unrelated impact forces in the non-heat exchange state, thereby improving the overall operational stability of the battery device 10.

[0121] In some embodiments, such as Figure 6 and Figure 7 As shown, the battery device 10 may further include a thermally conductive pad 14. The thermally conductive pad 14 may be disposed between the thermally conductive member 12 and the first wall 101. The thermal conductivity of the thermally conductive pad 14 at a first temperature is greater than that at a second temperature, and the first temperature is greater than the second temperature.

[0122] It should be understood that the thermal pad 14 can change with temperature, and the trend can be that the thermal conductivity of the thermal pad 14 increases with increasing temperature. That is, in high-temperature environments, the thermal conductivity of the thermal pad 14 is relatively high, thereby accelerating the heat dissipation efficiency of the battery device 10; in low-temperature environments, the thermal conductivity of the thermal pad 14 is relatively low, thereby reducing the loss of heat inside the battery device 10 and achieving a heat preservation effect.

[0123] The thermal pad 14 is disposed between the thermal conductive element 12 and the first wall 101, that is, the orthographic projections of the thermal pad 14 and the thermal conductive element 12 on the first wall 101 at least partially overlap. The projection of the thermal pad 14 may completely cover the projection of the thermal conductive element 12, or it may partially cover the projection of the thermal conductive element 12, and the embodiments of this application are not limited thereto.

[0124] In this embodiment, by setting a thermal pad 14, which has a relatively high thermal conductivity at high temperatures and a relatively low thermal conductivity at low temperatures, the battery device 10 can improve heat dissipation efficiency at high temperatures and improve heat preservation effect at low temperatures, thereby maintaining the battery device 10 within a relatively stable temperature range and improving the stability of the battery device 10 operation.

[0125] It should be understood that the thermal pad 14 may contact at least one of the thermally conductive element 12 and the first wall 101. For example, the thermal pad 14 may contact the thermally conductive element 12 and have a gap between it and the first wall 101. Alternatively, the thermal pad 14 may contact the first wall 101 and have a gap between it and the thermally conductive element 12. Yet another example is that the thermal pad 14 may contact both the thermally conductive element 12 and the first wall 101.

[0126] In some embodiments, the thermal pad 14 is spaced apart from one of the thermal conductive element 12 and the first wall 101. This further enhances the overall heat preservation effect of the battery device 10 in the non-heat exchange state; in the heat exchange state, external pressure can bring the first wall 101 into contact with the thermal pad 14, thereby forming a heat dissipation path where the heat from the battery cell 20 sequentially passes through the thermal conductive element 12, the thermal pad 14, and the first wall 101 to the outside of the housing 11, thus improving the operating performance of the battery device 10 under different temperature environments.

[0127] In some embodiments, the thermal conductivity λ1 of the thermal pad 14 is related to the temperature t as follows: when the temperature t satisfies -20° ≤ t ≤ 0°, the thermal conductivity λ1 satisfies: 0.02 W / (m•K) ≤ λ1 ≤ 0.1 W / (m•K); or, when the temperature t satisfies 0° ≤ t ≤ 25°, the thermal conductivity λ1 satisfies: 0.1 W / (m•K) ≤ λ1 ≤ 5 W / (m•K); or, when the temperature t satisfies 25° ≤ t ≤ 45°, the thermal conductivity λ1 satisfies: 5 W / (m•K) ≤ λ1 ≤ 10 W / (m•K); or, when the temperature t satisfies 45° ≤ t ≤ 50°, the thermal conductivity λ1 satisfies: 10 W / (m•K) ≤ λ1 ≤ 200 W / (m•K).

[0128] In this embodiment, by setting the relationship between the thermal conductivity of the heat-conducting pad 14 and the temperature, the battery device 10 can improve heat dissipation efficiency at high temperatures and improve heat preservation effect at low temperatures, thereby maintaining the battery device 10 within a relatively stable temperature range and improving the stability of the battery device 10 operation.

[0129] It should be understood that when the temperature t satisfies -20°≤t≤0°, for example, the temperature can be the following values ​​or any value between the following: -20°, -18°, -15°, -12°, -10°, -6°, -5°, -2°, 0°, the thermal conductivity λ1 can be the following values ​​or any value between the following: 0.02 W / (m•K), 0.03 W / (m•K), 0.04 W / (m•K), 0.05 W / (m•K), 0.06 W / (m•K), 0.07 W / (m•K), 0.08 W / (m•K), 0.09 W / (m•K), 0.1 W / (m•K).

[0130] It should be understood that when the temperature t satisfies 0°≤t≤25°, for example, the temperature can be the following values ​​or any value between the following: 0°, 2°, 3°, 5°, 6°, 10°, 15°, 18°, 19°, 20°, 21°, 22°, 25°, the thermal conductivity λ1 can be the following values ​​or any value between the following: 0.1 W / (m•K), 0.5 W / (m•K), 1 W / (m•K), 1.5 W / (m•K), 2 W / (m•K), 2.5 W / (m•K), 3 W / (m•K), 3.5 W / (m•K), 4 W / (m•K), 4.5 W / (m•K), 5 W / (m•K).

[0131] It should be understood that when the temperature t satisfies 25°≤t≤45°, for example, the temperature can be the following values ​​or any value between the following: 25°, 30°, 32°, 35°, 36°, 37°, 38°, 39°, 40°, 45°, and the thermal conductivity λ1 can be the following values ​​or any value between the following: 5 W / (m•K), 5.5 W / (m•K), 6 W / (m•K), 6.5 W / (m•K), 7 W / (m•K), 7.5 W / (m•K), 8 W / (m•K), 8.5 W / (m•K), 9 W / (m•K), 9.5 W / (m•K), 10 W / (m•K).

[0132] It should be understood that when the temperature t satisfies 45°≤t≤50°, for example, the temperature can be the following values ​​or any value between the following: 45°, 46°, 47°, 48°, 49°, 50°, the thermal conductivity λ1 can be the following values ​​or any value between the following: 10 W / (m•K), 20 W / (m•K), 30 W / (m•K), 40 W / (m•K), 50 W / (m•K), 60 W / (m•K), 70 W / (m•K), 80 W / (m•K), 90 W / (m•K), 100 W / (m•K), 125 W / (m•K), 150 W / (m•K), 175 W / (m•K), 180 W / (m•K), 200 W / (m•K).

[0133] In some embodiments, the thermal conductivity λ1 of the thermal pad 14 can also satisfy the following relationship with temperature t: when temperature t satisfies t≤-20°, the thermal conductivity λ1 satisfies: λ1≤0.02W / (m•K); or, when temperature t satisfies t≥50°, the thermal conductivity λ1 satisfies: λ1≥200W / (m•K).

[0134] The thermal pad 14 may include a substrate and a filler, wherein the substrate material may include one or more of the following: polyurethane, acrylic, paraffin, polyethylene glycol, fatty acid, and epoxy resin, and the filler may include one or more of the following: graphene, boron nitride, metal, carbon fiber, and alumina.

[0135] For example, the matrix material can be polyurethane, acrylic acid, paraffin wax, polyethylene glycol, fatty acid or epoxy resin; the filler can be graphene, boron nitride, metal, carbon fiber or alumina.

[0136] Materials with phase change properties, such as polyurethane, acrylic acid, paraffin wax, polyethylene glycol, and fatty acids, and the shape memory properties of epoxy resin and polyurethane, can be used as the supporting structure of the thermal pad 14. Materials with high thermal conductivity, such as graphene, boron nitride, metals, carbon fiber, and alumina, can be used as fillers in the thermal pad 14 to fill the pores of the substrate and form a complete thermal pad material. This allows the thermal pad 14 to achieve a low thermal conductivity at low temperatures to achieve heat preservation, and a high thermal conductivity at high temperatures to achieve heat conduction.

[0137] For example, taking thermal pad 14 as a phase change material filled foam, open-cell foam is formed using polyurethane, acrylic acid, paraffin wax, polyethylene glycol, fatty acids, etc., and highly thermally conductive nanofillers such as graphene, boron nitride, metals, carbon fibers, and alumina are filled into the pores of the foam to form thermal pad 14. At low temperatures, the phase change material is solid, which combines with the foam skeleton to form a large number of solid-solid interfaces. The interface thermal resistance is high, the overall heat conduction path is tortuous, and the thermal conductivity is low, thus achieving the heat preservation effect. At high temperatures, the phase change material is liquid with good fluidity, which can better wet and bridge the thermally conductive fillers and the foam skeleton, forming an efficient heat permeation network, significantly increasing the thermal conductivity, thereby quickly dissipating heat.

[0138] For example, taking thermally conductive foam with shape memory polymer matrix as thermal pad 14 as an example, epoxy resin, polyurethane, etc. are used as the matrix, and graphene, boron nitride, metal, carbon fiber, alumina and other high thermal conductivity fillers are composited to form a porous structure. At low temperatures, the shape memory polymer is in a glassy state, hard and brittle, and its internal microporous structure is stable. The contact between the fillers is not tight, and the thermal conductivity is low, thus achieving the heat preservation effect. At high temperatures, the shape memory polymer softens and recovers. Under external pressure or its own expansion, the foam structure is compressed, the contact points between the high thermal conductivity fillers increase, the contact thermal resistance decreases sharply, and a highly efficient heat conduction path is formed.

[0139] It should be understood that the battery device 10 may include both the elastic element 13 and the thermal pad 14, or it may include only one of the elastic element 13 and the thermal pad 14. The embodiments of this application are not limited thereto.

[0140] In some embodiments, such as Figure 5As shown, the battery device 10 includes only an elastic member 13, which abuts against the battery cell 20 and the first wall 101 respectively, and the thickness of the elastic member 13 is greater than the thickness of the heat-conducting member 12 in the direction perpendicular to the first wall 101.

[0141] In some embodiments, such as Figure 6 As shown, the battery device 10 includes a thermal pad 14, which is disposed between the thermal conductive member 12 and the first wall 101.

[0142] In some embodiments, such as Figure 7 As shown, the battery device 10 includes an elastic element 13 and a thermal pad 14. The elastic element 13 is disposed on the surface of the battery cell 20 near the first wall 101 and abuts against the battery cell 20 and the first wall 101 respectively. The thermal pad 14 is disposed between the thermal element 12 and the first wall 101, and in the direction perpendicular to the first wall 101, the thickness of the elastic element 13 is greater than or equal to the sum of the thickness of the thermal element 12 and the thickness of the thermal pad 14.

[0143] In some embodiments, continue to refer to Figures 2 to 7 The battery device 10 includes a battery cell assembly 15, which includes a plurality of battery cells 20 arranged along a first direction X; a heat-conducting element 12 extends along the first direction X and is connected to the plurality of battery cells 20; the first direction X is parallel to the first wall 101.

[0144] By setting the heat-conducting element 12 to extend along the direction in which the multiple battery cells 20 are arranged, the heat-conducting element 12 can connect the multiple battery cells 20. On the one hand, it can balance the temperature difference between the multiple battery cells 20, prevent local overheating, thereby extending the service life of the battery device 10 and improving the reliability of the battery device. On the other hand, the heat-conducting element 12 can constrain the expansion of the multiple battery cells 20 and improve the structural strength of the battery device 10.

[0145] In some embodiments, the elastic member 13 may also extend along the first direction X and abut against the plurality of battery cells 20 and the first wall 101 respectively. In this way, the gap between the plurality of battery cells 20 and the first wall 101 can be better supported, reducing the contact between the first wall 101 and the heat-conducting member 12 caused by external unrelated impact forces in non-heat exchange state, thereby improving the overall operational stability of the battery device 10.

[0146] In some embodiments, the thermal pad 14 may also extend along the first direction X, thereby improving the overall temperature uniformity of the battery device 10.

[0147] In some embodiments, continue to refer to Figures 2 to 7The battery device 10 may include a plurality of battery cell assemblies 15 arranged in the second direction Y and a plurality of heat-conducting elements 12 spaced apart along the second direction Y. Two adjacent battery cell assemblies 15 are connected to the same heat-conducting element 12. The second direction Y is parallel to the first wall 101 and perpendicular to the first direction X.

[0148] It should be understood that two adjacent battery cell assemblies 15 can be connected to the same heat conductor 12 by placing the heat conductor 12 at a shoulder position close to each other on the two adjacent battery cell assemblies 15, thereby enabling the heat conductor 12 to be connected to the two adjacent battery cell assemblies 15.

[0149] In this embodiment, two adjacent battery cell assemblies 15 are connected to the same heat conductor 12, so that the heat conductor 12 can be disposed on the shoulder of the battery cell assembly 15. Since the shoulder is usually relatively flat, the heat conductor 12 can be better attached to the surface of the battery cell 20, thereby improving the thermal conductivity of the heat conductor 12. Multiple heat conductors 12 are spaced apart along the second direction Y. Compared with a whole heat conductor plate, this can save materials. Especially when the electrode terminals of the battery cell 20 face the first wall 101, the heat conductor 12 can be disposed away from the electrode terminals and can be accommodated in the space formed by the height of the electrode terminals themselves, thereby improving the energy density of the battery device 10.

[0150] In some embodiments, continue to refer to Figures 2 to 7 The battery device 10 may also include an end plate 16, which is housed within the housing space formed by the housing 11 and abuts against the end of the battery cell assembly 15 along the first direction X; the end plate 16 may be connected to the housing 11 and connected to the heat conductor 12.

[0151] It should be understood that the number of end plates 16 can be one or more, and the end plates 16 can abut against the ends of the battery cell assembly 15 along the first direction X. For example, one end plate 16 can be provided and abut against any one end of the battery cell assembly 15 along the first direction X. Another example is that two end plates 16 can be provided and abut against both ends of the battery cell assembly 15 along the first direction X. Yet another example is that multiple end plates 16 can be provided, and the battery device 10 includes multiple battery cell assemblies 15, in which case the multiple end plates 16 are provided in a one-to-one correspondence with the multiple battery cell assemblies 15, or one end plate 16 can be provided at each end of each battery cell assembly 15 along the first direction X.

[0152] The end plate 16 abuts against the end of the battery cell assembly 15, which can resist the expansion force of the battery cell 20 and reduce the risk of the battery cell assembly 15 moving or deforming due to the expansion force.

[0153] The end plate 16 can be connected to the housing 11, which can improve the overall structural stability of the battery device 10 and further transfer the expansion force of the battery cell 20 to the housing through the end plate 16, reducing the risk of local structural failure of the end plate 16 due to concentrated expansion force and improving the overall resistance to expansion force of the battery device 10. The end plate 16 can be connected to any part of the housing 11, and the connection method is not limited, as long as the connection is fixed. For example, the two ends of the end plate 16 along the second direction Y can be connected to the housing 11 respectively.

[0154] The end plate 16 can also be connected to the heat-conducting component 12. For example, the two ends of the heat-conducting component 12 along the first direction X are respectively connected to the end plate 16. In this way, by connecting the heat-conducting component 12 to the end plate 16, the stability of the heat-conducting component 12 can be ensured, the loosening of the heat-conducting component 12 due to the shaking of the battery device 10 can be reduced, the effective contact between the heat-conducting component 12 and the battery cell 20 can be ensured, the heat transfer performance can be improved, and the ability to resist the expansion force of the battery cell 20 can be further improved.

[0155] In this embodiment, by setting an end plate 16 and connecting the end plate to the heat-conducting component 12 and the housing 11 respectively, on the one hand, the stability of the connection of the heat-conducting component 12 can be improved, reducing the loosening of the heat-conducting component 12 due to the shaking of the battery device 10, ensuring effective contact between the heat-conducting component 12 and the battery cell 20, and improving the heat transfer performance; on the other hand, it can resist the expansion force of the battery cell 20, reducing the risk of the battery cell assembly 15 moving or deforming due to the expansion force, and improving the overall structural stability of the battery device 10.

[0156] In some embodiments, the battery device 10 may include a plurality of thermal pads 14 extending along a first direction X, and the plurality of thermal pads 14 are disposed in a one-to-one correspondence with a plurality of thermal conductive elements 12.

[0157] The number of thermal pads 14 can be the same as the number of thermal conductive elements 12, with one thermal pad 14 corresponding to the side of each thermal conductive element 12 closest to the first wall 101. The number of thermal pads 14 can also differ from the number of thermal conductive elements 12; the number of thermal pads 14 can be greater than or less than the number of thermal conductive elements 12, or the number of thermal pads 14 can be a multiple of the number of thermal conductive elements 12. It should be understood that the arrangement of thermal pads 14 and thermal conductive elements 12 can be adjusted according to actual conditions.

[0158] In some embodiments, the battery device 10 may include a plurality of elastic members 13 extending along a first direction X, and each of the plurality of heat-conducting members 12 is provided with an elastic member 13 on at least one side along a second direction Y.

[0159] The number of elastic elements 13 can be the same as the number of heat-conducting elements 12. For example, each heat-conducting element 12 is provided with an elastic element 13 on one side along the second direction Y.

[0160] The number of elastic elements 13 can be different from the number of heat-conducting elements 12. For example, the number of elastic elements 13 can be twice the number of heat-conducting elements 12. Each heat-conducting element 12 is provided with an elastic element 13 on both sides along the second direction Y.

[0161] In this embodiment, by setting multiple elastic elements 13 and / or multiple thermal pads 14, it is possible to ensure that different areas inside the battery device 10 have good heat preservation and heat dissipation performance, thereby further improving the operational stability of the battery device 10 under different temperature environments.

[0162] In some embodiments, continue to refer to Figures 5 to 7 The heat-conducting component 12 and the battery cell 20 can be bonded together using thermally conductive adhesive 17. The thermal conductivity λ4 of the thermally conductive adhesive 17 can satisfy: 0.1W / (m•K)≤λ4≤20W / (m•K). While the thermally conductive adhesive 17 can fix the heat-conducting component 12 and the battery cell 20 together, the thermally conductive adhesive 17 also has a certain thermal conductivity, thereby enabling rapid heat transfer between the battery cell 20 and the heat-conducting component 12, improving the heat dissipation performance of the battery device 10 under heat exchange conditions.

[0163] Specifically, the thermal conductivity λ4 of the thermally conductive adhesive 17 can be any of the following values ​​or between any of the following values: 0.1 W / (m•K), 0.15 W / (m•K), 0.25 W / (m•K), 0.3 W / (m•K), 0.5 W / (m•K), 1 W / (m•K), 2 W / (m•K), 3 W / (m•K), 4 W / (m•K), 5 W / (m•K), 6 W / (m•K), 7 W / (m•K), 8 W / (m•K), 9 W / (m•K), 10 W / (m•K), 15 W / (m•K), 20 W / (m•K).

[0164] In some embodiments, the material of the thermally conductive adhesive 17 may include polyurethane, acrylic, hybrid adhesives, etc. The hybrid adhesive may include acrylic-silicone hybrids, epoxy-polyurethane hybrids, etc. These materials have high adhesive strength, which can improve the stability of the internal structure of the battery device 10, and also have certain thermal conductivity, thereby improving the heat dissipation performance of the battery device 10 under heat exchange conditions.

[0165] Figure 8 An embodiment of this application shows a charging device 200 that can be used to charge a battery device 10.

[0166] like Figure 8 As shown, the charging device 200 may include a mounting platform 210, which can be used to place the battery device 10.

[0167] It should be understood that the battery device 10 can be placed on the mounting platform 210 or hung on the mounting platform 210. This application does not limit the position of the battery device 10 and the mounting platform 210.

[0168] In some embodiments, the mounting platform 210 may also be provided with a heat exchange component 220. When the battery device 10 is placed on the mounting platform 210, the first wall 101 of the battery device 10 may abut against the heat exchange component 220. That is, the heat exchange component 220 may be disposed on the outside of the first wall 101, so that in the heat exchange state, the heat inside the battery device 10 is removed by the heat exchange component 220, thereby improving the heat dissipation efficiency of the battery device 10.

[0169] It should be understood that the first wall 101 abuts against the heat exchange component 220, thereby allowing the first wall 101 to contact the heat-conducting component 12 inside the battery device 10, thus forming a heat conduction path of battery cell 20-heat-conducting component 12-first wall 101-heat exchange component 220.

[0170] In some embodiments, the battery device 10 may include an elastic member 13, with the first wall 101 abutting against the heat exchange component 220, thereby compressing the elastic member 13 to bring the first wall 101 into contact with the heat-conducting component 12. Thus, by using the elastic member 13 for support, unnecessary heat loss caused by the contact between the first wall 101 and the heat-conducting component 12 in a non-heat exchange state is reduced, ensuring the stable operation of the battery device 10.

[0171] It should be understood that the heat exchange component 220 can be a liquid-cooled component, an air-cooled component, etc. For example, the heat exchange component 220 can be a liquid cooling plate, coolant piping, heat exchange core, heat dissipation air duct / channel, heat dissipation fins, air guide plate, etc.

[0172] In some embodiments, the heat exchange component 220 may include a flow channel plate and a thermal pad, with the thermal pad positioned on the side of the flow channel plate facing the first wall 101.

[0173] The flow channel plate can be equipped with a flowable heat exchange medium, which can remove the heat of the battery device 10.

[0174] The heat exchange component 220 abuts against the first wall 101 of the battery device 10 through a thermal pad, which can ensure effective contact between the heat exchange component 220 and the first wall 101, thereby improving the overall heat exchange performance.

[0175] It should be understood that the thermal pad can be the thermal pad 14 mentioned above, or other foam with a certain thermal conductivity, as long as the heat exchange component 220 is in effective contact with the first wall 101. The embodiments of this application are not limited to this.

[0176] In some embodiments, the charging device 200 may further include a charging module 230 for charging the battery device 10.

[0177] According to some embodiments of this application, this application also provides an electrical device, including the battery device 10 described in any of the above embodiments, wherein the battery device 10 provides electrical energy to the electrical device.

[0178] In some implementations, the electrical device can be a vehicle, ship, or spacecraft.

[0179] According to some embodiments of this application, see Figures 2 to 8 This application provides a battery device 10, including: a housing 11, a battery cell 20, and a heat-conducting component 12; wherein, the housing 11 has a receiving space and includes a first wall 101; the battery cell 20 is received in the receiving space; the heat-conducting component 12 is disposed on the surface of the battery cell 20 near the first wall 101 and is connected to the battery cell 20; the heat-conducting component 12 is spaced apart from the first wall 101.

[0180] 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: A housing having a receiving space, and the housing including a first wall; A battery cell, wherein the battery cell is housed in the housing space; A heat-conducting component is disposed on the surface of the battery cell near the first wall and connected to the battery cell; The heat-conducting component is spaced apart from the first wall; An elastic element is disposed on the surface of the battery cell near the first wall and abuts against the battery cell and the first wall respectively. The orthographic projection of the elastic element and the thermal conductive element on the first wall do not coincide.

2. The battery device according to claim 1, characterized in that, The elastic element is disposed on at least one side of the heat-conducting element in a direction parallel to the first wall and is in close contact with the heat-conducting element.

3. The battery device according to claim 1, characterized in that, The battery device further includes a thermally conductive pad disposed between the thermally conductive element and the first wall. The thermal conductivity of the thermally conductive pad at a first temperature is greater than that at a second temperature, and the first temperature is greater than the second temperature.

4. The battery device according to claim 3, characterized in that, The thermal pad is spaced apart from either the thermal conductive element or the first wall.

5. The battery device according to claim 3, characterized in that, The thermal conductivity λ1 of the thermal pad is related to the temperature t by the following: When the temperature t satisfies -20° ≤ t ≤ 0°, the thermal conductivity λ1 satisfies: 0.02 W / (m•K) ≤ λ1 ≤ 0.1 W / (m•K); or When the temperature t satisfies 0°≤t≤25°, the thermal conductivity λ1 satisfies: 0.1W / (m•K)≤λ1≤5W / (m•K); or When the temperature t satisfies 25° ≤ t ≤ 45°, the thermal conductivity λ1 satisfies: 5 W / (m•K) ≤ λ1 ≤ 10 W / (m•K); or When the temperature t satisfies 45°≤t≤50°, the thermal conductivity λ1 satisfies: 10W / (m•K)≤λ1≤200W / (m•K).

6. The battery device according to claim 3, characterized in that, The thermal pad includes a substrate and a filler. The substrate is made of one of the following materials: polyurethane, acrylic acid, paraffin wax, polyethylene glycol, fatty acid, and epoxy resin. The filler is made of one of the following materials: graphene, boron nitride, metal, carbon fiber, and alumina.

7. The battery device according to any one of claims 1 to 6, characterized in that, The battery device includes a battery cell assembly, the battery cell assembly including a plurality of battery cells arranged along a first direction; The heat-conducting element extends along the first direction and is connected to the plurality of battery cells; The first direction is parallel to the first wall.

8. The battery device according to claim 7, characterized in that, The battery device includes a plurality of battery cell assemblies arranged along a second direction and a plurality of heat-conducting elements spaced apart along the second direction. Two adjacent battery cell assemblies are connected to the same heat-conducting element. The second direction is parallel to the first wall and perpendicular to the first direction.

9. The battery device according to claim 8, characterized in that, The battery device further includes an end plate extending along the second direction, the end plate being received in the receiving space and abutting against the end of the battery cell assembly along the first direction; The end plate is connected to the housing and the end plate is also connected to the heat-conducting component.

10. The battery device according to claim 8, characterized in that, The battery device includes a plurality of thermal pads extending along the first direction, and the plurality of thermal pads are respectively disposed in correspondence with a plurality of thermal conductive elements; and / or The battery device includes a plurality of elastic elements that extend along the first direction, and each of the plurality of thermal conductive elements has the elastic element disposed on at least one side along the second direction.

11. The battery device according to claim 7, characterized in that, The heat-conducting component has a hollow structure.

12. The battery device according to any one of claims 1 to 6, characterized in that, The thermal conductivity λ2 of the heat-conducting component satisfies: 10W / (m•K)≤λ2≤500W / (m•K).

13. The battery device according to any one of claims 1 to 6, characterized in that, The heat-conducting component is a metal plate, and the material of the heat-conducting component includes one of copper, copper alloy, aluminum, aluminum alloy, and stainless steel.

14. The battery device according to any one of claims 1 to 6, characterized in that, The thermal conductivity λ3 of the first wall satisfies: 10W / (m•K)≤λ3≤500W / (m•K).

15. The battery device according to any one of claims 1 to 6, characterized in that, The thermally conductive component is bonded to the battery cell by thermally conductive adhesive, and the thermal conductivity λ4 of the thermally conductive adhesive satisfies: 0.1W / (m•K)≤λ4≤20W / (m•K).

16. An electrical appliance, characterized in that, Includes a battery device according to any one of claims 1 to 15, the battery device being used to provide electrical energy.

17. A charging device for charging a battery device, characterized in that, The charging device includes: a mounting platform for placing the battery device according to any one of claims 1 to 15; The mounting platform is equipped with a heat exchange component, and when the battery device is placed on the mounting platform, the first wall abuts against the heat exchange component.

18. The charging device according to claim 17, characterized in that, The battery device includes an elastic element that is compressed when the first wall abuts against the heat exchange component, so that the first wall contacts the heat conduction component.

19. The charging device according to claim 17, characterized in that, The heat exchange component includes a flow channel plate and a thermally conductive pad, with the thermally conductive pad positioned on the side of the flow channel plate facing the first wall.

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