Battery device, power utilization device and energy storage device

Abstract

The utility model discloses a battery device, a power utilization device and an energy storage device. The battery device comprises a battery monomer group, a gasket assembly and at least one heat exchange piece. The battery monomer group comprises a plurality of battery monomers arranged along a first direction; the gasket assembly is arranged on one side of the single battery along the first direction, the gasket assembly comprises a heat conduction part, and at least one side of the heat conduction part along the first direction is provided with a heat insulation part; the heat exchange part is positioned on one side of the battery monomer along a second direction and is connected with the heat conduction part, and the second direction is vertical to the first direction. According to the heat exchange piece and the gasket assembly disclosed by the embodiment of the invention, good heat insulation, heat conduction and heat dissipation can be carried out on the plurality of battery monomers of the battery monomer group, the possibility of thermal runaway of the battery device and diffusion of the thermal runaway is reduced, and the reliability of the battery device is improved.

Description

Technical Field

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

[0002] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the energy storage field and so on.

[0003] During the use of battery cells in a battery device, due to situations such as overheating, short circuit, overcharging, self-heating, or mechanical collision, there may be a risk of thermal runaway. When a battery cell undergoes thermal runaway, a large amount of heat will be generated, which may further cause thermal runaway of other battery cells or damage to components within the battery device, and then trigger a chain reaction, making the thermal runaway more severe. Therefore, how to reduce the possibility of a battery cell undergoing thermal runaway and reduce the spread of thermal runaway is one of the research topics in the industry. Summary of the Utility Model

[0004] To solve the above technical problems, this application provides a battery device, an electrical device, and an energy storage device with a low possibility of thermal runaway and a low risk of thermal runaway spread.

[0005] This application is achieved through the following technical solutions.

[0006] In a first aspect of this application, a battery device is provided. The battery device includes: a battery cell group, the battery cell group including a plurality of battery cells arranged along a first direction; a gasket assembly disposed on one side of the battery cells along the first direction, the gasket assembly including a heat-conducting member, and heat-insulating members are provided on at least one side of the heat-conducting member along the first direction; and at least one heat-exchanging member located on one side of the battery cells along a second direction and connected to the heat-conducting member, the second direction being perpendicular to the first direction.

[0007] Since the battery device includes a heat-exchanging member, thus, the heat generated by each battery cell in the battery cell group can be heat-exchanged through the heat-exchanging member, thereby improving the heat dissipation ability of the battery cells and reducing the possibility of the battery cells undergoing thermal runaway.

[0008] In addition, the battery device further includes a gasket assembly, and the gasket assembly includes a heat insulation member. Thus, even if a thermal runaway occurs in the battery cell, the heat generated by the thermal runaway can be blocked by the heat insulation member, thereby reducing the possibility of heat diffusion and reducing the possibility of the thermal runaway becoming more severe. Since the gasket assembly further includes a heat conducting member, and the heat conducting member is connected to the heat exchanging member, even if the heat insulation member fails to completely isolate the heat, this heat can still be conducted to the heat exchanging member through the heat conducting member for heat exchange, thereby further reducing the possibility of heat diffusion and reducing the possibility of the heat affecting other battery cells or other components in the battery device, thus improving the reliability and stability of the battery device.

[0009] In some embodiments, at least one side of the heat conducting member in the second direction is bent toward the first direction, and the heat conducting member is respectively formed into a planar portion, a bent portion, and a flanging portion, and the heat exchanging member is connected to the flanging portion.

[0010] Thus, through the connection between the flanging portion of the heat conducting member and the heat exchanging member, the contact area between the heat conducting member and the heat exchanging member can be increased, and the heat of the battery cell can be quickly conducted to the heat exchanging member, thereby improving the heat exchange efficiency of the battery cell and being beneficial to improving the connection reliability between the heat conducting member and the heat exchanging member.

[0011] In some embodiments, the battery cell includes two first surfaces opposite to each other in the first direction and a second surface connected to the first surfaces; the flanging portion is located between the second surface and the heat exchanging member.

[0012] Thus, the planar portion of the heat conducting member is connected to the first surface of the battery cell, and the flanging portion is connected to the second surface of the battery cell. The heat generated by the battery cell can be quickly conducted to the heat exchanging member through the first surface and the second surface via the planar portion and the flanging portion, enabling rapid heat exchange on multiple surfaces of the battery cell, thereby further improving the heat exchange efficiency of the battery cell.

[0013] In some embodiments, the gasket assembly further includes an adhesive member, and the adhesive member is located between the heat conducting member and the heat insulation member and is used for bonding the heat conducting member and the heat insulation member.

[0014] Thus, the heat conducting member and the heat insulation member can be bonded by the adhesive member, enabling better fitting between the two.

[0015] In some embodiments, the gasket assembly further includes a frame member, the frame member is in a frame shape, the heat insulation member is placed inside the frame member, the planar portion of the heat conducting member is placed inside the frame member, and the bent portion and the flanging portion extend out of the frame member.

[0016] Thus, additional structural support can be provided for the gasket assembly, reducing the likelihood of displacement or deformation of the gasket assembly when the battery cell expands or is subjected to an external force collision, thereby maintaining the integrity and functionality of the gasket assembly. Moreover, encapsulating the gasket assembly within the frame member makes the installation and maintenance of the gasket assembly more convenient, enabling the gasket assembly to be more easily fixed to and separated from the battery cell.

[0017] In some embodiments, the frame member comprises a silicone-based material or a foamed polypropylene-based material.

[0018] Silicone-based materials and foamed polypropylene-based materials have good high-temperature resistance, enabling the frame member to provide good encapsulation and support in a high-temperature environment, and also having good insulation and flame retardant properties. Additionally, these two materials have a low density and are lightweight, which helps to reduce the overall weight of the battery device and is beneficial for the lightweight design of the battery device.

[0019] In some embodiments, the gasket assembly further comprises an encapsulation member that encapsulates the heat insulation member and at least a portion of the heat conduction member, and the encapsulation member comprises a PI material or a PET material.

[0020] Thus, the encapsulation member can provide good insulation and encapsulation for the gasket assembly, reducing the likelihood of the gasket assembly being affected by the external environment and extending the service life of the gasket assembly. Additionally, PI materials or PET materials have excellent physical properties, chemical properties, and dimensional stability, and also have good mechanical properties and heat resistance, and are not easily damaged in a high-temperature environment, thereby being beneficial for improving the reliability of the gasket assembly and better insulating and conducting heat for the battery cell.

[0021] In some embodiments, the heat insulation member is configured such that its thickness in the first direction can change with the expansion of the battery cell, so that the heat insulation member absorbs the expansion of the battery cell at least in a state where the battery cell expands.

[0022] Thus, in addition to being able to insulate the heat diffused by the battery cell, the heat insulation member can also absorb the expansion of the battery cell, thereby being able to reduce the degree of expansion of the battery cell, reduce the risks caused by expansion, and is beneficial for improving the cycle life of the battery device.

[0023] Additionally, since the thickness of the heat insulation member in the first direction can change with the expansion of the battery cell, therefore, a suitable expansion space can be provided for the battery cell, enabling the expansion force of the battery cell to be evenly released, reducing the likelihood of the battery cell undergoing free expansion, reducing the polarization accumulation of the battery cell, and being beneficial for improving the performance of the battery device.

[0024] In some embodiments, the heat insulation member includes an aerogel-based heat insulation material or a foamed heat insulation material.

[0025] The aerogel-based heat insulation material and the foamed heat insulation material have good heat insulation performance and good compression performance. Thus, they can well isolate the heat generated by the battery cell and can absorb the expansion force of the battery cell, which is beneficial to improving the service life of the battery cell. In addition, the aerogel-based heat insulation material and the foamed heat insulation material also have good light weight, which is beneficial to realizing the lightweight of the battery device.

[0026] In some embodiments, the heat conduction member includes graphene sheets, aluminum foil, aluminum-magnesium alloy foil, titanium metal foil, or silver metal foil.

[0027] The above materials all have a relatively high thermal conductivity and excellent heat conduction performance, so as to improve the heat dissipation efficiency of the battery cell.

[0028] In some embodiments, the thickness of the heat conduction member is less than the thickness of the heat insulation member.

[0029] Thus, while ensuring good heat insulation and heat conduction for the battery cell, it can also effectively save the space inside the box of the battery device, which is beneficial to improving the energy density of the battery device.

[0030] In some embodiments, the thickness of the heat conduction member is between 0.1 mm and 1 mm; and / or the thickness of the heat insulation member is between 1 mm and 3 mm.

[0031] When the thicknesses of the heat conduction member and the heat insulation member are within a suitable range, the gasket assembly can achieve good heat insulation and heat conduction while realizing the lightweight design of the gasket assembly, which is beneficial to improving the space utilization rate inside the battery device.

[0032] In some embodiments, a plurality of fins are formed on two surfaces of the heat conduction member facing away from each other in the first direction; and / or a plurality of groove portions are formed on two surfaces of the heat conduction member facing away from each other in the first direction and are arranged at intervals.

[0033] Thus, the contact area between the heat conduction member and the surface of the battery cell can be increased, thereby improving the heat conduction efficiency of the heat conduction member and further accelerating the heat exchange efficiency of the battery cell.

[0034] In some embodiments, the battery device includes a box body, and the battery cell group is accommodated in the box body; the gasket assembly is located between adjacent battery cells in the battery cell group and / or between the battery cell and the inner wall of the box body adjacent to the battery cell.

[0035] Since the gasket assembly is located between adjacent battery cells, it can isolate the heat between adjacent battery cells, reduce the possibility of heat affecting adjacent battery cells, and at the same time conduct the heat that cannot be completely isolated from adjacent battery cells, improving the heat dissipation capacity of the battery cell group. It can also absorb the expansion force of adjacent battery cells and reduce the impact of the expansion of the battery cell on its performance. In addition, since the gasket assembly can also be located between the battery cell and the inner wall of the box adjacent to the battery cell, it can also isolate the transfer of the heat of the battery cell in the direction of the box, thereby reducing the possibility of the heat generated by the battery cell affecting other components in the box and improving the reliability of the battery device. Moreover, even for the battery cell adjacent to the inner wall of the box, the expansion force of the battery cell can be absorbed through the gasket assembly. It can be seen that the gasket assembly of the present application can provide good heat insulation, heat conduction, and heat dissipation for each battery cell housed in the box, and can also provide good expansion restraint for each battery cell housed in the box.

[0036] In some embodiments, when the gasket assembly is disposed between adjacent battery cells in the battery cell group, the number of the heat insulation members is two, and the two heat insulation members are disposed on opposite sides of the heat conduction member along the first direction.

[0037] Thus, it is possible to better insulate adjacent battery cells, further reduce the possibility of heat diffusion, and reduce the possibility of thermal runaway becoming more serious.

[0038] A second aspect of the present application provides an electrical device, and the electrical device includes the battery device according to the first aspect of the present application for providing electrical energy.

[0039] Since the electrical device provided by the embodiment of the present application adopts the battery device as described above, it can enhance the heat insulation, heat conduction, and heat dissipation effects of the battery device, enabling the battery device to better provide electrical energy for the electrical device. Moreover, the risk of the electrical device malfunctioning due to a malfunction of the battery device is reduced, the time spent on maintenance is reduced, and the reliability is higher.

[0040] In some embodiments, the electrical device includes an aircraft.

[0041] A third aspect of the present application provides an energy storage device, and the energy storage device includes the battery device according to the first aspect of the present application for storing or providing electrical energy.

[0042] Since the energy storage device provided by the embodiment of the present application adopts the battery device as described above, the heat insulation, heat conduction, and heat dissipation effects of the energy storage device can be enhanced, enabling the battery device to better provide electrical energy or store electrical energy for the energy storage device. Moreover, the risk of the energy storage device malfunctioning due to battery device failures is reduced, the time spent on maintenance is decreased, and the reliability is higher.

[0043] The beneficial effects of the embodiment of the present application include: Through the present application, the heat generated by the battery cell can be blocked by the heat insulation member of the gasket assembly, thereby reducing the possibility of heat diffusion and the possibility of thermal runaway being aggravated. Additionally, the heat that cannot be completely isolated by the heat insulation member can be conducted to the heat exchange member through the heat conduction member of the gasket assembly, further reducing the possibility of heat diffusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0045] Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application;

[0046] Figure 2 is a three-dimensional exploded schematic diagram of a battery device provided by some embodiments of the present application;

[0047] Figure 3 is a three-dimensional structural schematic diagram of a battery cell provided by some embodiments of the present application;

[0048] Figure 4 is a partial planar structural schematic diagram of an electrode assembly provided by some embodiments of the present application;

[0049] Figure 5 is a planar structural schematic diagram of a gasket assembly provided by some embodiments of the present application;

[0050] Figure 6 is a partial planar schematic of a battery device provided by some embodiments of the present application Figure 1 ;

[0051] Figure 7 is a partial planar schematic of a battery device provided by some embodiments of the present application Figure 2 ;

[0052] Figure 8 is a partial planar schematic of a battery device provided by some embodiments of the present application Figure 3 ;

[0053] Figure 9 Partial plan view of the battery device provided in some embodiments of the present application Figure 4 ;

[0054] Figure 10 Partial plan view of the battery device provided in some embodiments of the present application Figure 5 ;

[0055] Figure 11 Partial plan view of the battery device provided in some embodiments of the present application Figure 6 ;

[0056] Figure 12 Partial plan view of the battery device provided in some embodiments of the present application Figure 7 ;

[0057] Figure 13 Partial plan view of the battery device provided in some embodiments of the present application Figure 8 。

[0058] Description of reference numerals

[0059] 1, box body; 1a, first box body; 1b, second box body; 2, battery cell; 2a, electrode assembly; 2aa, positive electrode sheet; 2ab, negative electrode sheet; 2ac, separator; 21, first surface; 22, second surface; 3, gasket assembly; 31, heat conducting member; 311, flat portion; 312, flanging portion; 32, heat insulating member; 33, bonding member; 34a, frame member; 34b, encapsulation member; 4, heat exchange member; 10, battery cell group; 100, battery device; 200, controller; 300, motor; 1000, vehicle. Detailed implementation manners

[0060] Hereinafter, embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusion.

[0062] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0063] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0064] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0065] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0066] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0067] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0068] Next, the present application will be described in detail.

[0069] Currently, new energy batteries are increasingly widely used in life and industry. New energy batteries are not only applied to energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric transportation tools such as electric bicycles, electric motorcycles, and electric vehicles, as well as in many fields such as aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0070] During the charge and discharge cycle of the battery cells in the battery device, the complete conversion of chemical energy and electrical energy cannot be achieved. A part of the chemical energy will be converted into heat energy, that is, heat is generated. The accumulation of heat may affect the performance of the battery cells, and may even cause thermal runaway of the battery cells, posing a relatively large safety hazard.

[0071] Generally, the number of battery cells in the battery device is multiple, and the battery device also includes many functional components that realize various functions of the battery device. In the case of thermal runaway of the battery cells, if the heat dissipated cannot be well isolated, the heat is very likely to spread to other surrounding battery cells or other component positions in the battery device, thereby further causing thermal runaway of other surrounding battery cells or damaging other components in the battery device, and then generating a chain reaction that makes the thermal runaway phenomenon more serious, seriously increasing the safety risk of the battery device.

[0072] Especially for battery devices applied in fields such as aerospace, due to their unique application environment, requirements adapted to this application scenario are put forward for the performance of the battery device. Taking an aircraft as an example, during takeoff or landing, the aircraft sometimes obtains a high discharge current from the battery device. In this case, the battery cells in the battery device will release a large amount of heat, and thus the risk of thermal diffusion is higher.

[0073] In the related art, an insulating layer is usually provided between the battery cells to isolate the heat generated by the battery cells. However, the insulating layer can only simply play the role of heat isolation and does not have the functions of heat conduction and heat dissipation for the battery cells. Therefore, the heat generated by the battery cells is likely to accumulate, thereby having a certain impact on the performance of the battery cells. In addition, when the heat generated by the battery cells is excessive, the insulating layer will be difficult to block all the heat, so that the heat may still spread to other battery cells or other components in the battery device, thereby causing an adverse impact.

[0074] In view of the problems existing in the above related technologies, the present application provides a battery device, which includes a battery cell group, a gasket assembly, and at least one heat exchanger. The battery cell group includes a plurality of battery cells arranged in a first direction; the gasket assembly is disposed on one side of the battery cells in the first direction, and the gasket assembly includes a heat conducting member, and heat insulating members are disposed on at least one side of the heat conducting member in the first direction; the heat exchanger is located on one side of the battery cells in a second direction and is connected to the heat conducting member, and the second direction is perpendicular to the first direction.

[0075] Since the battery device includes a heat exchanger, thus, the heat generated by each battery cell of the battery cell group can be heat-exchanged through the heat exchanger, thereby improving the heat dissipation capacity of the battery cells and reducing the possibility of thermal runaway of the battery cells.

[0076] In addition, the battery device further includes a gasket assembly, and the gasket assembly includes heat insulating members. Thus, even if thermal runaway occurs in the battery cells, the heat generated by the thermal runaway can be blocked by the heat insulating members, thereby reducing the possibility of heat diffusion and reducing the possibility of the aggravation of thermal runaway. Since the gasket assembly further includes a heat conducting member, and the heat conducting member is connected to the heat exchanger, therefore, even if the heat insulating members fail to completely isolate the heat, this heat can still be conducted to the heat exchanger through the heat conducting member for heat exchange, thereby further reducing the possibility of heat accumulation and heat diffusion, and reducing the possibility that the heat affects other battery cells or other components in the battery device, thereby improving the reliability and stability of the battery device.

[0077] The battery apparatus provided by the embodiments of the present application can be but is not limited to being used in power consumption devices such as energy storage power systems, vehicles, ships, or aircraft, as well as energy storage devices such as energy storage containers and energy storage electric cabinets.

[0078] The embodiments of the present application provide a power consumption device including the above battery device for providing electric energy. The power consumption device includes but is not limited to mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toys can include fixed or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc., and the spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0079] In the following embodiments, for the convenience of description, a vehicle 1000 as a power consumption device according to an embodiment of the present application is taken as an example for description.

[0080] Figure 1 The structural schematic diagram of a vehicle provided for some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. AsFigure 1 As shown in Figure 1 , a battery device 100 is provided inside the vehicle 1000. The battery device 100 can be arranged at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can serve as the operating power source of the vehicle 1000. The vehicle 1000 can 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, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0081] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000 but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0082] Below, with reference to Figures 2 to 13 some embodiments of the present application will be described in detail.

[0083] Figure 2 FIG. [Reference numeral not provided] is a three-dimensional exploded view of the battery device provided for some embodiments of the present application. Figure 3 FIG. [Reference numeral not provided] is a three-dimensional structural view of a battery cell provided for some embodiments of the present application. Figure 4 FIG. [Reference numeral not provided] is a partial plan view of an electrode assembly provided for some embodiments of the present application. Figure 5 FIG. [Reference numeral not provided] is a plan view of a gasket assembly provided for some embodiments of the present application. Figures 6 to 13 FIG. [Reference numeral not provided] is a partial plan view of the battery device provided for some embodiments of the present application.

[0084] In some embodiments of the present application, for ease of description, a first direction and a second direction are defined. The first direction and the second direction are perpendicular to each other. However, those skilled in the art should understand that the embodiments of the present application are not limited to the case where the two directions are perpendicular to each other. For ease of description, as shown by the arrows in Figures 4 to 13 the direction of arrow X is taken as the first direction, and the direction of arrow Y is taken as the second direction.

[0085] As Figures 2 to 4 、 Figures 6 to 13 shown, in a first aspect of the present application, a battery device 100 is provided. The battery device 100 includes a battery cell group 10, a gasket assembly 3, and at least one heat exchange member 4. The battery cell group 10 includes a plurality of battery cells 2 arranged along the first direction. The gasket assembly 3 is disposed on one side of the battery cell 2 along the first direction. The gasket assembly 3 includes a heat conducting member 31, and a heat insulating member 32 is provided on at least one side of the heat conducting member 31 along the first direction. The heat exchange member 4 is located on one side of the battery cell 2 along the second direction and is connected to the heat conducting member 31. The second direction is perpendicular to the first direction.

[0086] The battery device 100 is used to provide voltage and capacity.

[0087] The battery cell 2 can be a secondary battery, which refers to a battery cell 2 that can be activated by charging the active material after discharging the battery cell 2 and can be used continuously.

[0088] The battery cell 2 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0089] The battery cell 2 includes an electrode assembly 2a, which is a component in the battery cell 2 where an electrochemical reaction occurs. The electrode assembly 2a includes a positive electrode sheet 2aa, a negative electrode sheet 2ab, and a separator 2ac. The positive electrode sheet 2aa, the negative electrode sheet 2ab, and the separator 2ac are usually stacked along the thickness direction (the first direction) of the battery cell 2. During the charging and discharging process of the battery cell 2, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode sheet 2aa and the negative electrode sheet 2ab. The separator 2ac is disposed between the positive electrode sheet 2aa and the negative electrode sheet 2ab, which can prevent the short circuit between the positive and negative electrode sheets and at the same time allow the active ions to pass through.

[0090] The electrode assembly 2a can be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0091] In some embodiments, the electrode assembly 2a is a wound structure. The positive electrode sheet 2aa and the negative electrode sheet 2ab are wound into a wound structure.

[0092] In some embodiments, the electrode assembly 2a is a stacked structure.

[0093] As an example, as Figure 4 shown, multiple positive electrode sheets 2aa and multiple negative electrode sheets 2ab can be respectively provided, and the multiple positive electrode sheets 2aa and the multiple negative electrode sheets 2ab are alternately stacked.

[0094] As an example, multiple positive electrode sheets 2aa can be provided, and the negative electrode sheet 2ab is folded to form multiple stacked folding segments, and a positive electrode sheet 2aa is clamped between adjacent folding segments.

[0095] As an example, both the positive electrode sheet 2aa and the negative electrode sheet 2ab are folded to form multiple stacked folding segments.

[0096] As an example, multiple separators 2ac can be provided and are respectively disposed between any adjacent positive or negative electrode sheets.

[0097] As an example, the separator 2ac can be continuously arranged and is arranged between any adjacent positive electrode plates 2aa or negative electrode plates 2ab in a folded or wound manner.

[0098] In some embodiments, the battery cell 2 further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The present application does not specifically limit the type of electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel-like or solid.

[0099] In some embodiments, the electrode assembly 2a is provided with tabs, and the tabs can lead out the current from the electrode assembly 2a. The tabs include a positive tab and a negative tab.

[0100] In some embodiments, the battery cell 2 may include a housing. The housing is used to encapsulate components such as the electrode assembly 2a and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum plastic film, etc.

[0101] In the battery device 100, there can be multiple battery cells 2, and the multiple battery cells 2 can be connected in series, in parallel or in a hybrid connection to form a battery cell group 10. The hybrid connection means that there are both series and parallel connections among the multiple battery cells 2.

[0102] The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for realizing electrical connection between multiple battery cells 2.

[0103] The gasket assembly 3 is a component for managing the heat of the battery cell 2. In the embodiments of the present application, at least part of the gasket assembly 3 is generally flat, and the cross-sectional shape of at least part is generally the same as the shape of the first surface 21 of the battery cell 2. In this way, it can better contact the first surface 21 of the battery cell 2. Exemplarily, if the first surface 21 is formed as a rectangle, then part of the cross-section of the gasket assembly 3 is also generally rectangular.

[0104] As Figure 5 shown, the gasket assembly 3 includes a heat-conducting member 31 and a heat-insulating member 32, which are used to simultaneously insulate and conduct heat for the battery cell 2. Specifically, the heat-conducting member 31 and the heat-insulating member 32 are arranged in a laminated structure along the first direction.

[0105] In the embodiments of the present application, the thickness direction of the battery cell 2 can be referred to as the first direction, and the direction in which two first surfaces 21 face each other can also be referred to as the first direction. The first direction can also be the direction in which the positive electrode sheet 2aa, the negative electrode sheet 2ab, and the separator 2ac of the electrode assembly 2a are stacked. Those skilled in the art should understand that when the electrode assembly 2a is a wound structure, the electrode assembly 2a includes a bent section and a straight section. At this time, the stacking direction of the positive electrode sheet 2aa, the negative electrode sheet 2ab, and the separator 2ac in the straight section is the first direction. In the embodiments of the present application, the directions perpendicular to the first direction can all be referred to as the second direction. For example, the height direction of the battery cell 2 and the length direction of the battery cell 2 can both be referred to as the second direction.

[0106] The heat exchanger 4 is located on one side of the battery cell 2 along the second direction. The heat exchanger 4 can be located on the bottom wall or the top wall of the battery cell 2, or the heat exchanger 4 can be located on the side wall of the battery cell 2. Alternatively, the number of the heat exchangers 4 can be multiple, and multiple heat exchangers 4 are simultaneously located on the bottom wall, the top wall, and the side wall of the battery cell 2.

[0107] The heat insulation member 32 is used to isolate the heat generated by the battery cell 2, so it can reduce the possibility of heat diffusion, so that the heat is not easily diffused to other surrounding battery cells 2, or is not easily diffused to the positions of other components within the battery device 100, reducing the adverse effects of heat on other battery cells 2 or other components. In addition, even when thermal runaway occurs in the battery cell 2, the heat generated by the thermal runaway can be blocked by the heat insulation member 32, thereby reducing the possibility of the severity of the thermal runaway.

[0108] Exemplarily, the heat insulation member 32 includes aerogel-based heat insulation materials or foaming-based heat insulation materials. The heat insulation member 32 can also be a composite material of aerogel-based heat insulation materials and foaming-based heat insulation materials. For example, the aerogel-based heat insulation materials can be aerogel, ceramic fiber aerogel, pre-oxidized fiber aerogel, etc.; the foaming-based heat insulation materials can be foamed polyurethane, foamed polypropylene, foamed polystyrene, foamed silicone rubber, foamed polyamide resin, foamed polyethylene terephthalate / butylene terephthalate, foamed phenolic resin, etc.

[0109] In the embodiments of the present application, the heat insulation member 32 is in contact with the first surface 21 of the battery cell 2. The first surface 21 is the large surface (the wall surface with the largest area) of the battery cell 2. The heat insulation member 32 is in contact with the large surface, which can better insulate the battery cell 2.

[0110] In some other embodiments, such as Figure 13As shown, the heat conducting member 31 of the gasket assembly 3 is in contact with the first surface 21 of the battery cell 2. Thus, the heat conducting member 31 is in direct contact with the large surface of the battery cell 2, and thereby directly transfers the heat of the battery cell 2 to the heat exchanging member 4 via the large surface, further improving the heat conduction efficiency of the battery cell 2.

[0111] The heat conducting member 31 is used to export the heat of the battery cell 2. In the embodiment of the present application, the heat conducting member 31 is connected to the heat exchanging member 4.

[0112] Exemplarily, the material of the heat conducting member 31 can be graphene, graphite, carbon nanotubes, silicon carbide (SIC), a metal material or other high thermal conductivity materials.

[0113] Since the gasket assembly 3 further includes the heat conducting member 31, and the heat conducting member 31 is connected to the heat exchanging member 4, therefore, even if the heat insulating member 32 fails to completely isolate the heat, the heat can still be conducted to the heat exchanging member 4 through the heat conducting member 31 connected to the heat insulating member 32 for heat exchange, thereby further reducing the possibility of heat diffusion, and reducing the possibility of heat affecting other battery cells 2 or other components in the battery device 100, thus improving the reliability and stability of the battery device 100.

[0114] Exemplarily, as Figure 6 shown, when the number of battery cells 2 is multiple, the gasket assembly 3 can be located between adjacent battery cells 2. At this time, the gasket assembly 3 can include two heat insulating members 32 and one heat conducting member 31, thereby forming a three-layer stacked structure, with the heat conducting member 31 located between the two heat insulating members 32, and the two heat insulating members 32 are respectively in contact with the first surface 21 of the adjacent battery cells 2. Or, the gasket assembly 3 can include two heat conducting members 31 and one heat insulating member 32, thereby forming a three-layer stacked structure, with the heat insulating member 32 located between the two heat conducting members 31, and the two heat conducting members 31 are respectively in contact with the first surface 21 of the adjacent battery cells 2.

[0115] Another exemplarily, as Figure 13 shown, when the number of battery cells 2 is multiple, the gasket assembly 3 can be located between adjacent battery cells 2. At this time, the gasket assembly 3 located between adjacent battery cells 2 can include one heat conducting member 31 and one heat insulating member 32, thereby forming a two-layer stacked structure, with the heat conducting member 31 in contact with the first surface 21 of one battery cell 2, and the heat insulating member 32 in contact with the first surface 21 of the adjacent battery cell 2, while ensuring the heat exchange efficiency, reducing the possibility of heat transfer to the adjacent battery cell 2.

[0116] Still another exemplarily, as Figure 7 shown, the gasket assembly 3 can also be located between the battery cell 2 and the inner wall of the box body 1. Figure 7The rightmost battery cell 2 can be regarded as the battery cell 2 closest to the inner wall of the box body 1. At this time, the gasket assembly 3 can include only one heat insulation member 32 and one heat conduction member 31, thus forming a double-layer stacked structure, and the heat insulation member 32 is in contact with the first surface 21 of the battery cell 2 or the heat conduction member 31 is in contact with the first surface 21 of the battery cell 2.

[0117] Of course, those skilled in the art should understand that the gasket assembly 3 located between adjacent battery cells 2 can also form a multi-layer stacked structure, that is, it includes more heat insulation members 32 and heat conduction members 31 arranged in a stacked manner. The gasket assembly 3 located between the battery cell 2 and the box body 1 can also form a multi-layer stacked structure, that is, it includes two or more heat insulation members 32 and heat conduction members 31. When the number of gasket assemblies 3 is multiple, the number of layers of the stacked structure of each gasket assembly 3 can be the same or different, and the arrangement of the stacked structure of each gasket assembly 3 can be the same or different. The embodiments of the present application do not specifically limit the number and arrangement manner of the heat conduction members 31 and heat insulation members 32 arranged in a stacked manner for each gasket assembly 3.

[0118] The heat exchange member 4 is a structural member for heat exchanging the battery cell 2.

[0119] The heat exchange member 4 can be, for example, a liquid cooling plate, a water cooling plate or any other device that can achieve heat exchange. In a specific embodiment, the heat exchange member 4 is a water cooling plate. A flow channel for the flow of a heat exchange medium such as water is formed inside the heat exchange member 4. The water inlet and the water outlet can be respectively connected to the most upstream section and the most downstream section of the flow channel. The water with a lower temperature can flow in from the water inlet, exchange heat with the battery cell 2 outside the flow channel while flowing, and then the water heated due to heat exchange flows out from the water outlet. Thus, the heat dissipation effect of the battery cell 2 can be effectively improved, the temperature of the battery cell 2 can be reduced, and the stability and reliability of the battery cell 2 can be improved.

[0120] In the embodiments of the present application, the heat exchange member 4 is generally in a flat plate shape and is in contact with the second surface 22 of the battery cell 2. Any surface perpendicular to the first surface 21 can be referred to as the second surface 22. In some other embodiments, the heat exchange member 4 can also be in any other suitable shape. The embodiments of the present application do not specifically limit the shape of the heat exchange member 4.

[0121] The second surface 22 is a wall surface adjacent to and connected to the first surface 21. For example, the top wall (top cover), bottom wall, and side walls of the battery cell 2 can all be referred to as the second surface 22. In the embodiments of the present application, the heat exchange member 4 is in contact with the bottom wall of the battery cell 2. In some other embodiments, the heat exchange member 4 can also be in contact with at least one side wall of the battery cell 2 other than the first surface 21, or the number of the heat exchange members 4 can be multiple (two or more), and multiple heat exchange members 4 can be in contact with multiple side walls of the battery cell 2 at the same time or in contact with the bottom wall and side walls of the battery cell 2 at the same time. The embodiments of the present application do not specifically limit the number of the heat exchange members 4 and the second surface 22 with which the heat exchange members 4 are in contact, as long as heat exchange can be performed on the battery cell 2.

[0122] Thus, the heat generated by the battery cell 2 can be heat-exchanged through the heat exchange member 4 in contact with the second surface 22, thereby improving the heat dissipation ability of the battery cell 2 and reducing the possibility of thermal runaway of the battery cell 2. Moreover, since the heat exchange member 4 is also connected to the heat conducting member 31, the heat emitted from the first surface 21 of the battery cell 2 can also be conducted to the heat exchange member 4 via the heat conducting member 31, thereby performing heat exchange and further reducing the possibility of heat diffusion of the battery cell 2 and improving the reliability and stability of the battery device 100.

[0123] In some embodiments of the present application, the heat conducting member 31 is bent toward the first direction on at least one side in the second direction, and the heat conducting member 31 is respectively formed into a flat portion 311, a bent portion, and a flanging portion 312, and the heat exchange member 4 is connected to the flanging portion 312.

[0124] The flat portion 311 and the flanging portion 312 are generally flat. Thus, it is possible to better facilitate the connection between the two and the surface of the battery cell 2 or the surface of the heat exchange member 4, improve the connection reliability, and the bent portion bends to connect the flat portion 311 and the flanging portion 312, so that the extending direction of the flat portion 311 is different from the extending direction of the flanging portion 312.

[0125] Thus, the gasket assembly 3 can be connected to the heat exchange member 4 through the flanging portion 312 of the heat conducting member 31, thereby increasing the contact area between the heat conducting member 31 and the heat exchange member 4, quickly conducting the heat of the battery cell 2 to the heat exchange member 4, further improving the heat exchange efficiency of the battery cell 2, and being beneficial to improving the connection reliability between the heat conducting member 31 and the heat exchange member 4.

[0126] In Figure 8 In the specific example shown, the heat conducting member 31 is bent toward the first direction on one side in the second direction (the side facing the side wall of the battery cell 2) to form a flanging portion 312. In some other embodiments, it can also be that the heat conducting member 31 is bent toward the first direction on both sides in the second direction to form two flanging portions 312.

[0127] InFigure 8 In the specific example shown, the heat conducting member 31 is bent upward in the first direction to form a flanging portion 312. In some other embodiments, the heat conducting member 31 may also be bent downward in the first direction to form a flanging portion 312.

[0128] The embodiments of the present application do not Figure 8 specifically limit the formation manner of the shown flanging portion 312, as long as the flanging portion 312 can contact the second surface 22 and can be connected to the heat exchange member 4.

[0129] In Figure 7 the specific example shown, the heat conducting member 31 is bent in the first direction on one side in the second direction (the side facing the bottom wall of the battery cell 2) to form a flanging portion 312. In some other embodiments, it may also be that the heat conducting member 31 is bent in the first direction on the other side in the second direction (the side facing the top cover of the battery cell 2) to form a flanging portion 312, or it may also be that the heat conducting member 31 is bent in the first direction on both sides in the second direction to form two flanging portions 312.

[0130] In Figure 7 the specific example shown, the heat conducting member 31 is bent to the left in the first direction to form a flanging portion 312. In some other embodiments, the heat conducting member 31 may also be bent to the right in the first direction to form a flanging portion 312.

[0131] The embodiments of the present application also do not Figure 7 specifically limit the formation manner of the shown flanging portion 312, as long as the flanging portion 312 can contact the second surface 22 and can be connected to the heat exchange member 4.

[0132] Those skilled in the art should understand that the heat conducting member 31 may have only one flanging portion 312 or may have multiple flanging portions 312. The embodiments of the present application do not specifically limit the number and formation position of the flanging portions 312, as long as the heat conducting member 31 can be connected to the heat exchange member 4 through the flanging portion 312. Or, in some other embodiments, the heat conducting member 31 may not have a bending portion and a flanging portion 312, and the heat conducting member 31 may be directly connected to the heat exchange member 4 through its end.

[0133] In some embodiments, the battery cell 2 includes two first surfaces 21 opposite to each other in the first direction and a second surface 22 connected to the first surface 21. The flanging portion 312 is located between the second surface 22 and the heat exchange member 4.

[0134] Thus, the planar portion 311 of the heat conducting member 31 is connected to the first surface 21 of the battery cell 2, and the flanging portion 312 is connected to the second surface 22 of the battery cell 2. The heat generated by the battery cell 2 can be quickly conducted to the heat exchange member 4 via the first surface 21, the second surface 22, the planar portion 311 and the flanging portion 312, enabling rapid heat exchange on multiple surfaces of the battery cell 2, thereby further improving the heat exchange efficiency of the battery cell 2.

[0135] Exemplarily, the first surface 21 can be the wall surface with the largest area of the battery cell 2, i.e., the large surface of the battery cell 2.

[0136] In some embodiments, as Figure 5 shown, the gasket assembly 3 further includes an adhesive member 33. The adhesive member 33 is located between the heat conducting member 31 and the heat insulating member 32 and is used to bond the heat conducting member 31 and the heat insulating member 32.

[0137] Thus, the heat conducting member 31 and the heat insulating member 32 can be bonded by the adhesive member 33, enabling better fitting between the two.

[0138] Exemplarily, the adhesive member 33 can be, for example, a heat conductive adhesive.

[0139] In some embodiments, as Figure 5 shown, the gasket assembly 3 further includes a frame member 34a. The frame member 34a is in a frame shape. The heat insulating member 32 is placed inside the frame member 34a, and the planar portion 311 of the heat conducting member 31 is placed inside the frame member 34a. The bent portion and the flanging portion 312 extend out of the frame member 34a.

[0140] Thus, additional structural support can be provided for the gasket assembly 3, reducing the possibility of displacement or deformation of the gasket assembly 3 when the battery cell 2 expands or is subjected to external force collision, thereby maintaining the integrity and functionality of the gasket assembly 3.

[0141] Moreover, encapsulating the gasket assembly 3 inside the frame member 34a makes it more convenient for the installation and maintenance of the gasket assembly 3, enabling the gasket assembly 3 to be more easily fixed to and separated from the battery cell 2.

[0142] In some embodiments, the frame member 34a includes a silicone-based material or a foamed polypropylene-based material.

[0143] The silicone-based material and the foamed polypropylene-based material have good high-temperature resistance, enabling the frame member 34a to also play a good encapsulation and support role in a high-temperature environment, and they also have good insulation and flame retardancy properties.

[0144] In addition, these two materials have low density and light weight, which helps to reduce the overall weight of the battery device 100 and is beneficial to the lightweight design of the battery device.

[0145] In some embodiments, the gasket assembly 3 further includes a encapsulant 34b that encapsulates the heat insulator 32 and at least a portion of the heat conductor 31, and the encapsulant 34b includes a PI material or a PET material.

[0146] Thus, the encapsulant 34b can play a good role in insulating and encapsulating the gasket assembly 3, reducing the possibility of the gasket assembly 3 being affected by the external environment, and extending the service life of the gasket assembly 3.

[0147] Exemplarily, the encapsulant 34b can be, for example, a PET film (high-temperature resistant polyester film). The PET film has excellent physical properties, chemical properties, and dimensional stability, and has good mechanical properties, heat resistance, high toughness, good tensile strength, and good impact resistance. Therefore, the PET film is not easily damaged in a high-temperature environment and does not easily affect the function of the heat insulator 32 to absorb the expansion of the battery cell 2.

[0148] Also exemplarily, the encapsulant 34b can also be, for example, a PI film (polyimide film), a PP film (polypropylene film), a PC film (polycarbonate film), a PVC film (polyvinyl chloride film), etc.

[0149] In some embodiments of the present application, the heat insulator 32 is configured such that its thickness in the first direction can change with the expansion of the battery cell 2, so that the heat insulator 32 absorbs the expansion of the battery cell 2 at least in the state where the battery cell 2 expands.

[0150] During the charge and discharge cycle of the battery cell 2, chemical reactions occur in its internal electrode assembly 2a, electrolyte, etc., and there are phenomena such as negative electrode expansion or gas generation leading to the expansion of the battery cell 2.

[0151] Especially for a lithium metal battery using lithium metal as the negative electrode, the negative electrode expands in volume during the cycle, which causes the thickness of the electrode assembly 2a to continuously increase, resulting in the battery cell 2 bulging or even the battery cell 2 failing.

[0152] In addition to being able to insulate the heat diffused by the battery cell 2, the heat insulator 32 in the embodiments of the present application can also absorb the expansion of the battery cell 2, thereby being able to reduce the expansion degree of the battery cell 2, reduce the risks caused by the expansion, and is beneficial to improving the cycle life of the battery device 100.

[0153] Moreover, since the heat insulator 32 can simultaneously act as a buffer to absorb the expansion of the battery cell 2, there is no need to provide an additional buffer structure, which can effectively reduce the number of components in the battery device 100, reduce the production cost, and can improve the space utilization rate in the box body 1, enabling more battery cells 2 to be arranged in the box body 1, which is beneficial to improving the energy density of the battery device 100.

[0154] In addition, since the thickness of the heat insulation member 32 in the first direction can change with the expansion of the battery cell 2, a suitable expansion space can be provided for the battery cell 2, so that the expansion force of the battery cell 2 can be evenly released, reducing the possibility of free expansion of the battery cell 2 and reducing the polarization accumulation of the battery cell 2, which is beneficial to improving the performance of the battery device 100.

[0155] In some embodiments of the present application, the heat insulation member 32 includes an aerogel-based heat insulation material or a foamed heat insulation material.

[0156] An aerogel is a lightweight porous material with a three-dimensional network structure. Its unique nano-porous structure and low-density characteristics endow the aerogel with good heat insulation performance. Moreover, the aerogel also has good compression performance.

[0157] Therefore, the heat insulation member 32 made of an aerogel-based material can well isolate the heat generated by the battery cell 2 and can absorb the expansion force of the battery cell 2, which is beneficial to improving the service life of the battery cell 2.

[0158] In addition, since the aerogel-based material is light in weight, it is beneficial to the light weight of the battery device 100.

[0159] Exemplarily, the aerogel layer can be a pre-oxidized fiber aerogel layer, a ceramic fiber aerogel layer, a silica aerogel composite glass fiber, or a silica aerogel composite ceramic fiber, etc.

[0160] The embodiments of the present application do not specifically limit the specific types of aerogel-based materials, as long as they can provide good heat insulation for the battery cell 2 and can absorb the expansion of the battery cell 2.

[0161] The foamed materials include but are not limited to foamed polyurethane, foamed polypropylene, foamed polystyrene, foamed silicone rubber, foamed polyamide resin, foamed polyethylene terephthalate / butylene terephthalate, foamed phenolic resin, etc. These materials have low thermal conductivity, so they also have good heat insulation performance and good compression performance. Therefore, they can play a certain role in buffering and energy absorption. In addition, the foamed materials have low density and light weight, which are also beneficial to the lightweight design of the battery device 100.

[0162] The embodiments of the present application also do not specifically limit the types of foamed materials.

[0163] Those skilled in the art should understand that in some other embodiments, the heat insulation member 32 can also be made of any other material with good heat insulation performance.

[0164] In some embodiments of the present application, the heat conducting member 31 includes graphene sheets, aluminum foils, aluminum-magnesium alloy foils, titanium metal foils, or silver metal foils.

[0165] The above materials all have relatively high thermal conductivity coefficients and excellent heat conduction performance, thus being able to improve the heat dissipation efficiency of the battery cell 2.

[0166] The thermal conductivity coefficient, also known as the heat conductivity or thermal diffusivity, is an important physical quantity for measuring the heat conduction ability of materials. Its definition is: under stable heat transfer conditions, when the thickness of the material is 1 meter and the temperature difference between the two side surfaces is 1 degree (K or °C), the amount of heat transferred through an area of 1 square meter per unit time. The unit of the thermal conductivity coefficient is usually watt per meter per kelvin (W / (m*K)), and sometimes it is also expressed in joule per square meter per kelvin (J / (m*K)) in the International System of Units. The magnitude of the thermal conductivity coefficient has an important impact on the heat insulation or heat dissipation performance of materials. For example, materials with low thermal conductivity coefficients perform excellently in heat insulation, while materials with high thermal conductivity coefficients are suitable for applications where rapid heat transfer is required.

[0167] Exemplarily, the thermal conductivity coefficient of graphene can be greater than or equal to 1400 W / (m*k). Thus, the heat conducting member 31 made of graphene can rapidly conduct the heat generated by the battery cell 2.

[0168] In addition, the thickness of the graphene heat conducting member is relatively small. Therefore, while ensuring the heat conduction performance, it can effectively improve the space utilization rate inside the battery device 100.

[0169] Those skilled in the art should understand that in some other embodiments, the heat conducting member 31 can also be made of any other suitable material with a high thermal conductivity coefficient.

[0170] In the embodiments of the present application, the gasket assembly 3 has a sheet-like structure. The sheet-like gasket assembly 3 occupies a relatively small space. While insulating and conducting heat for the battery cell 2, it can also effectively save the space inside the box body 1 of the battery device 100, making the structure inside the battery device 100 more compact, and thus being beneficial to improving the energy density of the battery device 100.

[0171] In some embodiments of the present application, the thickness of the heat conducting member 31 is less than the thickness of the heat insulating member 32.

[0172] Thus, while ensuring good heat insulation and heat conduction for the battery cell 2, it can also effectively save the space inside the box body 1 of the battery device 100, and thus be beneficial to improving the energy density of the battery device 100. In some embodiments of the present application, the thickness of the heat conducting member 31 is between 0.1 mm (millimeter) and 1 mm (millimeter); and / or the thickness of the heat insulating member 32 is between 1 mm and 3 mm.

[0173] Exemplarily, the thickness of the heat conducting member 31 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1 mm, etc. The thickness of the heat insulating member 32 can be 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm or 3 mm, etc.

[0174] When the thicknesses of the heat conducting member 31 and the heat insulating member 32 are within a suitable range, the gasket assembly 3 can achieve good heat insulation and heat conduction, while realizing the lightweight design of the gasket assembly 3. It is also beneficial to improve the space utilization rate inside the battery device. When the size of the box body 1 of the battery device 100 remains unchanged, more battery cells 2 can be arranged inside the box body 1, effectively improving the energy density of the battery device 100.

[0175] In some embodiments of the present application, although not shown in the figure, a plurality of fins are formed on two surfaces of the heat conducting member 31 facing away from each other in the first direction; and / or a plurality of groove portions are formed on two surfaces of the heat conducting member 31 facing away from each other in the first direction and are spaced apart.

[0176] Thus, the contact area between the heat conducting member 31 and the surface of the battery cell 2 can be increased through the fins and the groove portions, thereby improving the heat conduction efficiency of the heat conducting member 31 and further accelerating the heat exchange efficiency of the battery cell 2.

[0177] In some embodiments of the present application, in the projection plane perpendicular to the first direction, the projection area of the gasket assembly 3 is greater than or equal to the projection area of the first surface 21 of the battery cell 2.

[0178] Thus, the battery cell 2 can be better heat-insulated, reducing the possibility of heat diffusion and the possibility of thermal runaway becoming more serious. And it can also more effectively restrain the expansion of the battery cell 2, thereby maintaining the cycle life of the battery cell 2 and the good performance of the battery cell.

[0179] In some embodiments of the present application, as Figures 6 to 11 shown, the battery device 100 includes a box body 1, and a battery cell group 10 is accommodated inside the box body 1. The gasket assembly 3 is located between adjacent battery cells 2 inside the battery cell group 10, and / or between the battery cell 2 and the inner wall of the box body 1 adjacent to the battery cell 2.

[0180] The box body 1 is the external protective shell of the battery device 100, and a closed space is formed inside. Since the battery cell group 10 is located in the closed space of the box body 1, the box body 1 can play a certain protective role for the battery cell group 10, thereby reducing the possibility that each battery cell 2 of the battery cell group 10 is damaged due to mechanical collision or thermal runaway.

[0181] As shown Figure 2 in FIG. 1, the housing 1 may include a first housing 1a and a second housing 1b. The first housing 1a and the second housing 1b are snapped together so that a closed space is formed inside the housing 1 to accommodate the battery cell group 10. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first housing 1a may be a top cover, and the second housing 1b may be a bottom plate, or the first housing 1a may be a bottom plate, and the second housing 1b may be a top cover.

[0182] As an example, the housing 1 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the housing to accommodate the battery cell 2.

[0183] In some embodiments, the housing 1 may be part of the chassis structure of the vehicle 1000. For example, a part of the housing 1 may form at least a part of the floor of the vehicle 1000, or a part of the housing 1 may form at least a part of the cross member and longitudinal member of the vehicle 1000.

[0184] Since the gasket assembly 3 is located between adjacent battery cells 2, it can isolate the heat between adjacent battery cells 2, reduce the possibility of the heat affecting the adjacent battery cells 2, and can also conduct the heat that cannot be completely isolated between adjacent battery cells 2 at the same time, improve the heat conduction ability of the battery cells 2, and can also absorb the expansion force of adjacent battery cells 2 at the same time, reduce the influence of the expansion of the battery cells 2 on their own performance. Moreover, by sharing the gasket assembly 3 among adjacent battery cells 2, it helps to suppress the number of components and reduce the production cost.

[0185] In addition, since the gasket assembly 3 can also be located between the battery cell 2 and the inner wall of the housing 1 adjacent to the battery cell 2, it can also isolate the transfer of the heat of the battery cell 2 in the direction of the housing 1, thereby reducing the possibility that the heat generated by the battery cell 2 affects other components in the housing 1 and improving the reliability of the battery device 100. Moreover, even for the battery cell 2 adjacent to the inner wall of the housing 1, the expansion force of the battery cell 2 can be absorbed through the gasket assembly 3.

[0186] It can be seen that the gasket assembly 3 of the present application can provide good heat insulation and heat conduction for each battery cell 2 accommodated in the housing 1, and can also provide good expansion restraint for each battery cell 2 accommodated in the housing 1.

[0187] In some embodiments of the present application, when the gasket assembly 3 is disposed between adjacent battery cells 2 in the battery cell group 10, the number of the heat insulation members 32 is two, and the two heat insulation members 32 are disposed on opposite sides of the heat conduction member 31 along the first direction.

[0188] Thus, better heat insulation can be achieved for adjacent battery cells 2, further reducing the possibility of heat diffusion and the likelihood of thermal runaway exacerbation.

[0189] In addition, by reasonably setting the stacking structure of the gasket assembly 3, good heat insulation and heat conduction effects can be achieved while reducing the number of components and saving production costs.

[0190] Of course, those skilled in the art should understand that in some other embodiments, even if the gasket assembly 3 is disposed between adjacent battery cells 2 within the battery cell group 10, the gasket assembly 3 may also include different types of stacking structures. For example, the gasket assembly 3 may further include three heat insulation members 32 and two heat conduction members 31, and the heat insulation members 32 and the heat conduction members 31 are alternately stacked in sequence along the first direction.

[0191] In some embodiments of the present application, as Figure 9 and Figure 11 shown, the number of battery cell groups 10 can be multiple, and the multiple battery cell groups 10 are arranged along the second direction.

[0192] Thus, the multiple battery cell groups 10 are grouped along the second direction to form a battery cell module, thereby further increasing the energy density of the battery device 100.

[0193] Within the battery cell module, as Figure 12 shown, each gasket assembly 3 extending along the second direction can be a separate split structure and respectively contact the first surface 21 of each battery cell 2. Alternatively, as Figure 9 and Figure 11 shown, the gasket assemblies 3 between each battery cell group 10 can also be formed as an integral structure.

[0194] In some embodiments of the present application, the number of heat exchange members 4 is multiple, and the multiple heat exchange members 4 are located between adjacent battery cell groups 10; and / or the heat exchange members 4 are located on at least one side of the multiple battery cell groups 10 along the second direction and contact the second surface 22 of each battery cell 2 of each battery cell group 10.

[0195] Exemplarily, as Figure 12 shown, along the second direction, the heat exchange member 4 is located between adjacent battery cell groups 10.

[0196] Again exemplarily, as Figure 9 and Figure 11 shown, the heat exchange member 4 is located on opposite sides of the battery cell module along the second direction.

[0197] Still exemplarily, as Figure 6 、 Figure 7 and Figure 10As shown, the heat exchanger 4 is located on at least one side of the battery module in the second direction, that is, at least one side of the plurality of battery groups 10 in the second direction.

[0198] Thus, the heat exchanger 4 can perform good heat exchange on each battery cell 2 housed in the box body 1, improving the heat exchange capacity of the battery module.

[0199] The embodiments of the present application do not specifically limit the number and arrangement manner of the heat exchanger 4, which can be set according to actual situations. Thus, the number and position of the heat exchanger 4 can be flexibly changed, improving the layout flexibility within the battery device 100.

[0200] The second aspect of the present application provides an electrical device, which includes the battery device 100 described in the first aspect of the present application for providing electrical energy.

[0201] Since the electrical device provided by the embodiments of the present application adopts the battery device 100 as described above, it can enhance the heat insulation and heat dissipation effects of the battery device 100, enabling the battery device 100 to better provide electrical energy for the electrical device. Moreover, the risk of the electrical device malfunctioning due to the failure of the battery device 100 is reduced, the time spent on maintenance is reduced, and the reliability is higher.

[0202] In some embodiments of the present application, the electrical device includes an aircraft.

[0203] An aircraft generally refers to a device that flies within the atmosphere or in outer space (space), and can include aircraft flying within the atmosphere and spacecraft flying in space.

[0204] Aircraft can include airplanes, airships, etc. Exemplarily, they can be low-altitude aircraft, eVTOL (electric Vertical Take-off and Landing) aircraft, commuter airplanes, regional airplanes, etc.

[0205] Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0206] The third aspect of the present application provides an energy storage device, which includes the battery device 100 described in the first aspect of the present application for storing or providing electrical energy.

[0207] Since the energy storage device provided by the embodiments of the present application adopts the battery device 100 as described above, it can enhance the heat insulation and heat dissipation effects of the energy storage device, enabling the battery device 100 to better provide electrical energy or store electrical energy for the energy storage device. Moreover, the risk of the energy storage device malfunctioning due to the failure of the battery device 100 is reduced, the time spent on maintenance is reduced, and the reliability is higher.

[0208] Next, specific examples of some embodiments of the present application will be described with reference to the accompanying drawings.

[0209] As a specific example, the sandwich structure (gasket assembly 3) includes two layers of aerogel thermal insulation films (thermal insulation members 32) and one layer of graphene thermal conduction film (thermal conduction member 31). The graphene thermal conduction film is sandwiched between the two layers of aerogel thermal insulation films. By cleverly utilizing the characteristics of aerogel for heat insulation and compressibility to absorb the expansion force of the battery cell (battery monomer 2), the ultra-high thermal conductivity of the graphene thermal conduction film is used for heat conduction, and the heat is conducted to the bottom water-cooled plate (heat exchange member 4) through the in-plane high thermal conductivity of the graphene thermal conduction film to achieve the heat dissipation function, which has both heat insulation and heat conduction and cooling effects on the battery cell.

[0210] In this sandwich structure, the thickness of the graphene thermal conduction film is less than or equal to 1 mm, and the thickness of the aerogel thermal insulation film is between 1 mm and 3 mm. Thus, the design integrates heat insulation, heat conduction, and heat dissipation, with a simple structure and comprehensive functions, and has multifunctionality in terms of heat insulation and heat conduction.

[0211] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A battery device, characterized in that: The battery device comprises: A battery cell group, the battery cell group comprising a plurality of battery cells arranged along a first direction; a gasket assembly disposed on one side of the battery cell along the first direction, the gasket assembly comprising a heat conductive member, a heat insulating member disposed on at least one side of the heat conductive member along the first direction, the heat insulating member being in contact with a surface of the battery cell; and At least one heat exchange member is located on one side of the battery cell along a second direction and is connected to the heat conductive member, and the second direction is perpendicular to the first direction.

2. The battery device according to claim 1, characterized in that: The heat conducting member is bent along at least one side of the second direction toward the first direction, and the heat conducting member is formed into a plane portion, a bent portion and a flange portion, respectively, and the heat exchange member is connected to the flange portion.

3. The battery device according to claim 2, characterized in that: The battery cell comprises two first surfaces opposite to each other along the first direction and a second surface connected to the first surfaces; The flange portion is located between the second surface and the heat exchange element.

4. The battery device according to any one of claims 1 to 3, characterized in that: The gasket assembly also includes an adhesive component, which is located between the heat-conducting component and the heat-insulating component and is used to bond the heat-conducting component to the heat-insulating component.

5. The battery device according to claim 2 or 3, characterized in that: The gasket assembly also includes a frame member, which is frame-shaped, the heat insulating member is placed inside the frame member, the plane portion of the heat conductive member is placed inside the frame member, and the bending portion and the flange portion extend out of the frame member.

6. The battery device according to claim 5, characterized in that: The frame piece includes a silica gel material or a foamed polypropylene material.

7. The battery device according to any one of claims 1 to 3, characterized in that: The gasket assembly further includes a packaging component, which encapsulates the thermal insulation component and at least a portion of the thermal conductor, and the packaging component includes PI material or PET material.

8. The battery device according to any one of claims 1 to 3, characterized in that: The heat insulating member is configured such that a thickness along the first direction can be changed along with the expansion of the battery cell, so that the heat insulating member absorbs the expansion of the battery cell at least when the battery cell is expanded.

9. The battery device according to any one of claims 1 to 3, characterized in that: The thermal insulation element comprises an aerogel thermal insulation material or a foam thermal insulation material.

10. The battery device according to any one of claims 1 to 3, characterized in that: The heat conducting member comprises a graphene sheet or an aluminum foil or an aluminum-magnesium alloy foil or a titanium metal foil or a silver metal foil.

11. The battery device according to any one of claims 1 to 3, characterized in that: The thickness of the heat conducting member is smaller than the thickness of the heat insulating member.

12. The battery device according to claim 11, characterized in that The thickness of the heat conducting member is between 0.1 mm and 1 mm; and / or The thickness of the thermal insulation element is between 1 mm and 3 mm.

13. The battery device according to any one of claims 1 to 3, characterized in that: A plurality of fins are formed on two surfaces of the heat conducting member that are opposite to each other along the first direction; and / or A plurality of grooves arranged at intervals are formed on two surfaces of the heat conducting member that are opposite to each other along the first direction.

14. The battery device according to any one of claims 1 to 3, characterized in that: The battery device comprises a box, and the battery cell group is accommodated in the box; The gasket assembly is located between the adjacent battery cells in the battery cell group and / or between the battery cells and the inner wall of the box body adjacent to the battery cells.

15. The battery device according to claim 14, characterized in that: In the case where the gasket assembly is disposed between adjacent battery cells in the battery cell group, the number of the heat insulating members is two, and the two heat insulating members are disposed on opposite sides of the heat conductive member along the first direction.

16. An electrical device, characterized in that: The electrical device comprises the battery device according to any one of claims 1 to 15 for providing electrical energy.

17. The electrical device according to claim 16, characterized in that: The electrical device includes an aircraft.

18. An energy storage device, characterized in that: The energy storage device comprises the battery device according to any one of claims 1 to 15 for storing electrical energy or providing electrical energy.

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