Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. The shell comprises a bottom wall, a side wall and a cavity which is enclosed by the bottom wall and the side wall and is provided with an opening at one end in a first direction; the electrode assembly is arranged in the cavity; the insulation assembly is arranged on at least part of the surface of the side, away from the electrode assembly, of the side wall, the insulation assembly comprises a bonding layer, a first heat conduction layer and an insulation layer which are stacked in sequence, the first heat conduction layer is arranged between the insulation layer and the bonding layer, the bonding layer is connected with the side wall, and the heat conductivity of the first heat conduction layer is larger than that of the shell; the temperature of the side wall is balanced through the first heat conduction layer in the first direction, and the heat conduction capability between the shell and the external environment is improved, so that the problem that the performance and the service life of the battery monomer are adversely affected due to over-high or over-low temperature of the battery monomer is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery, in particular to a battery monomer, a battery device and a power consumption device. BACKGROUND

[0002] The battery device is widely used in electronic equipment, such as mobile phone, notebook computer, electric vehicle, electric vehicle, electric aircraft, electric ship, electric toy car, electric toy ship, electric toy aircraft and electric tool, etc.

[0003] However, the temperature of the battery monomer is too high or too low in the actual working process, which will adversely affect the service life and performance of the battery monomer. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a battery monomer, a battery device and a power consumption device, which can enhance the heat dissipation performance of the battery monomer, so as to enhance the performance and service life of the battery monomer.

[0005] In a first aspect, the present application provides a battery monomer, comprising: a shell comprising a bottom wall, a side wall and a cavity open at one end in a first direction enclosed by the bottom wall and the side wall; an electrode assembly arranged in the cavity; an insulation assembly arranged on at least part of the surface of the side wall away from the electrode assembly, the insulation assembly comprising an adhesive layer, a first heat conducting layer and an insulation layer stacked in turn, the first heat conducting layer being arranged between the insulation layer and the adhesive layer, the adhesive layer being connected with the side wall, and the thermal conductivity of the first heat conducting layer being greater than that of the shell.

[0006] In the scheme of the present application, the battery monomer comprises a shell, an electrode assembly and an insulation assembly, the shell comprises a bottom wall, a side wall and a cavity open at one end in a first direction enclosed by the bottom wall and the side wall; the electrode assembly is arranged in the cavity, and the insulation assembly is arranged on at least part of the surface of the shell away from the electrode assembly, the insulation assembly is connected with the side wall through the adhesive layer, so as to improve the stability of the insulation assembly, the insulation assembly comprises an insulation layer, so as to improve the insulation reliability between the shell and the external environment, and the insulation assembly further comprises a first heat conducting layer arranged between the insulation layer and the adhesive layer, the temperature of the side wall in the first direction is balanced through the first heat conducting layer, the heat conduction capacity between the shell and the external environment is improved, and the problem that the performance and service life of the battery monomer are adversely affected due to the temperature being too high or too low is solved.

[0007] In some embodiments, the battery monomer further comprises a second heat conducting layer arranged on at least part of the surface of the shell, the thermal conductivity of the second heat conducting layer being greater than that of the shell, and the second heat conducting layer is arranged separately from the insulation assembly, or the adhesive layer of the insulation assembly is connected with at least part of the second heat conducting layer.

[0008] In the scheme of the embodiment of the application, the second heat-conducting layer arranged on at least part of the surface of the shell is used to improve the heat-conducting capacity between the shell and the external environment, so as to solve the problem that the performance and service life of the battery cell are adversely affected due to the excessively high or low temperature of the battery cell.

[0009] In some embodiments, the second heat-conducting layer is at least partially overlapped with the insulating component along the thickness direction of the shell.

[0010] In the scheme of the embodiment of the application, the second heat-conducting layer is at least partially overlapped with the insulating component along the thickness direction of the shell, so as to enhance the heat-conducting capacity of at least part of the shell.

[0011] In some embodiments, the shell comprises a first edge close to the opening, and the second heat-conducting layer and the first edge are arranged at a distance in the first direction.

[0012] In the scheme of the embodiment of the application, the shell comprises a first edge close to the opening, and the second heat-conducting layer and the first edge are arranged at a distance in the first direction, so as to reduce the damage to the second heat-conducting layer when the shell and the end cover component are welded, and improve the reliability of the battery cell.

[0013] In some embodiments, the distance L between the second heat-conducting layer and the first edge in the first direction satisfies 5mm≤L≤10mm.

[0014] In the scheme of the embodiment of the application, when the distance L between the second heat-conducting layer and the first edge in the first direction satisfies the above condition, the problem that the second heat-conducting layer is easily damaged when the shell and the end cover component are welded due to the too small distance between the second heat-conducting layer and the first edge is solved, and the problem that the heat-conducting capacity of the shell is insufficient due to the too large distance between the second heat-conducting layer and the first edge and the small area of the second heat-conducting layer is solved.

[0015] In some embodiments, the second heat-conducting layer comprises heat-conducting material and adhesive material mixed with each other, the thermal conductivity of the heat-conducting material is greater than that of the shell, and the second heat-conducting layer is adhered to the shell by the adhesive material.

[0016] In the scheme of the embodiment of the application, the second heat-conducting layer comprises heat-conducting material and adhesive material mixed with each other, the thermal conductivity of the heat-conducting material is greater than that of the shell, so that the second heat-conducting layer has uniform heat-conducting capacity everywhere.

[0017] In some embodiments, the second heat-conducting layer is arranged on the surface of the side of the shell away from the cavity, and the adhesive layer is connected with the second heat-conducting layer.

[0018] In the scheme of the embodiment of the application, the second heat-conducting layer is arranged on the side surface of the shell away from the cavity, and the bonding layer and the second heat-conducting layer are connected, so as to reduce the risk that the second heat-conducting layer is easily fallen into the electrolyte after being damaged, and the battery monomer is damaged.

[0019] In some embodiments, the side wall includes two first side walls and two second side walls, the two first side walls are oppositely arranged in the second direction, the two second side walls are oppositely arranged in the third direction, the first direction, the second direction and the third direction are intersected two by two, the area of the first side wall is greater than the area of the second side wall, the second heat-conducting layer is arranged on the side of the first side wall away from the cavity, and / or the second heat-conducting layer is arranged on the side of the second side wall facing the cavity.

[0020] In the scheme of the embodiment of the application, the second heat-conducting layer is arranged on the side of the first side wall away from the cavity, so as to reduce the risk that the second heat-conducting layer is damaged by being extruded by the electrode assembly, and enhance the heat conduction rate between the shell and the external environment, and / or the second heat-conducting layer is arranged on the side of the second side wall facing the cavity, so as to enhance the heat conduction rate between the electrode assembly and the shell, and improve the problem that the second heat-conducting layer arranged on the outer surface of the shell is easily damaged due to scratching, knocking and the like.

[0021] In some embodiments, the battery monomer includes at least two insulation assemblies, and the two adjacent insulation assemblies are respectively a first assembly and a second assembly, and the bonding layer of the first assembly is bonded to the insulation layer of the second assembly.

[0022] In the scheme of the embodiment of the application, the at least two insulation assemblies are connected in a stacked manner, so as to enhance the insulation capability of the battery monomer, and improve the heat conduction capability between the battery monomer and the external environment.

[0023] In some embodiments, the insulation assembly also covers at least part of the bottom wall.

[0024] In the scheme of the embodiment of the application, the insulation assembly also covers at least part of the bottom wall, so as to enhance the insulation capability of the battery monomer, and improve the heat conduction capability between the battery monomer and the external environment by arranging a larger-area first heat-conducting layer.

[0025] In a second aspect, the embodiment of the application provides a battery device including the battery monomer of the first aspect.

[0026] In the scheme of the embodiment of the application, the battery monomer includes the insulation assembly arranged on at least part of the surface of the shell away from the electrode assembly, and the first heat-conducting layer in the insulation assembly is arranged to improve the heat conduction capability between the battery monomer and the external environment, so as to improve the performance of the battery monomer and the battery device.

[0027] In some embodiments, the battery device further comprises a heat exchange mechanism, and the battery cell further comprises a second heat conduction layer, which is arranged on a side of the bottom wall away from the electrode assembly, and is exposed to the insulation assembly and connected to the heat exchange mechanism.

[0028] In the scheme of the embodiments of the application, the second heat conduction layer is arranged on a side of the bottom wall away from the electrode assembly, and is exposed to the insulation assembly and connected to the heat exchange mechanism, so as to improve the heat conduction capacity of the bottom wall and the heat exchange mechanism, and to solve the problem of adverse effects on the performance and service life of the battery cell due to excessively high or low temperature of the battery cell.

[0029] In a third aspect, the embodiments of the application provide a power utilization device comprising the battery device of the second aspect. BRIEF DESCRIPTION OF DRAWINGS

[0030] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments, and are not intended to limit the scope of the application. Moreover, like reference numerals designate like parts throughout the several views in the drawings. In the drawings:

[0031] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the application;

[0032] Figure 2 is a structural schematic diagram of a battery device provided by an embodiment of the application;

[0033] Figure 3 is a structural schematic diagram of a battery module provided by an embodiment of the application;

[0034] Figure 4 is an exploded view of a battery cell provided by an embodiment of the application;

[0035] Figure 5 is a structural schematic diagram of a battery cell provided by an embodiment of the application;

[0036] Figure 6 is a structural schematic diagram of an insulation assembly of a battery cell provided by an embodiment of the application;

[0037] Figure 7 is a structural schematic diagram of a battery cell provided by an embodiment of the application;

[0038] Figure 8 is a structural schematic diagram of a battery cell provided by an embodiment of the application;

[0039] Figure 9 is a structural schematic diagram of a battery cell provided by an embodiment of the application;

[0040] Figure 10 is a partial structure schematic diagram of a battery cell provided by an embodiment of the present application. Figure 5 is a sectional view at A-A in

[0041] Figure 11 is a partial structure schematic diagram of a battery cell provided by another embodiment of the present application. Figure 5 is a sectional view at A-A in

[0042] Figure 12 is a partial structure schematic diagram of a battery cell provided by an embodiment of the present application.

[0043] Figure 13 is a partial structure schematic diagram of a battery cell provided by an embodiment of the present application.

[0044] Figure 14 is a partial structure schematic diagram of a battery device provided by an embodiment of the present application.

[0045] Reference signs:

[0046] 1, vehicle; 101, motor; 102, controller; 2, battery device; 201, battery module; 202, box body; 2021, first box body; 2022, second box body;

[0047] 3, battery cell;

[0048] 4, shell; 41, opening; 42, side wall; 43, bottom wall; 45, first edge; 421, first side wall; 422, second side wall;

[0049] 5, electrode assembly; 51, tab; 52, electrode body;

[0050] 6, end cover assembly; 61, electrode terminal;

[0051] 7, insulation assembly; 71, adhesive layer; 72, first heat-conducting layer; 73, insulation layer; 74, first assembly; 75, second assembly;

[0052] 8, second heat-conducting layer;

[0053] 9, heat exchange mechanism;

[0054] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0055] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0056] It should be noted that the technical terms or scientific terms used in the embodiments of the present application should be understood as the general meaning understood by the skilled in the art to which the embodiments of the present application belong, unless otherwise specified.

[0057] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0058] In addition, the technical terms "first", "second" and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0059] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0060] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0061] At present, from the development of market situation, the application of battery device is more and more extensive. The battery device is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of battery device, the demand of its market is also increasing.

[0062] During the use of the battery monomer, the temperature of the battery monomer is too high or too low, which leads to the problem that the performance of the battery monomer cannot meet the expected requirements.

[0063] The reason for the above problem is that during the operation of the battery monomer, the electrode assembly performs electrochemical reaction and generates heat, and this part of heat needs to be exchanged with the outside environment through the shell. Limited by the heat conduction rate of the shell, the internal temperature of the battery monomer cannot be quickly conducted to the outside, and the internal temperature accumulates and rises, and the electrode assembly is prone to lithium precipitation due to high temperature. In a low temperature environment, the external environment is also difficult to heat the electrode assembly due to the heat conduction rate of the shell, which leads to the problem that the capacity and pulse performance of the battery monomer are reduced due to low temperature, affecting the performance of the battery monomer.

[0064] Based on the above problem, the embodiment of the application provides a battery monomer, which comprises a shell, an electrode assembly and an insulation assembly. The shell comprises a bottom wall, a side wall and a cavity opened at one end in a first direction enclosed by the bottom wall and the side wall; the electrode assembly is arranged in the cavity, and the insulation assembly is arranged on at least part of the surface of the shell away from the electrode assembly. The insulation assembly is connected with the side wall through an adhesive layer to improve the stability of the insulation assembly. The insulation assembly comprises an insulation layer to improve the insulation reliability between the shell and the external environment. The insulation assembly further comprises a first heat conduction layer arranged between the insulation layer and the adhesive layer. The first heat conduction layer balances the temperature of the side wall in the first direction, improves the heat conduction capacity between the shell and the external environment, and solves the problem that the performance and service life of the battery monomer are adversely affected due to high or low temperature.

[0065] The technical scheme described in the embodiment of the application is applicable to battery devices and electric devices using battery devices.

[0066] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The electric device is not specially limited in the embodiments of the present application.

[0067] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0068] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc. The embodiments of the present application are not limited thereto.

[0069] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in the present application can include a battery module or a battery pack, etc. The battery pack generally includes a box for packaging one or more battery cells. The box can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery cell.

[0070] The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode current collecting part and a positive electrode tab connected to the positive electrode current collecting part, the positive electrode current collecting part is coated with the positive electrode active material layer, and the positive electrode tab is not coated with the positive electrode active material layer. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material layer includes a positive electrode active material, which can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collecting part and a negative electrode tab connected to the negative electrode current collecting part, the negative electrode current collecting part is coated with the negative electrode active material layer, and the negative electrode tab is not coated with the negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0071] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the above-described battery device and electric equipment, but can also be applied to all battery devices including a box body and electric equipment using the battery device, but for the sake of brevity, the following embodiments are described taking an electric vehicle as an example.

[0072] Please refer to Figure 1 , Figure 1 A structural schematic diagram of a vehicle 1 is provided for some embodiments of the present application. The vehicle 1 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric vehicle, a hybrid vehicle or a range extended vehicle, etc. The vehicle 1 is internally provided with a battery device 2, which can be arranged at the bottom, head or tail of the vehicle 1. The battery device 2 can be used for power supply of the vehicle 1, for example, the battery device 2 can be used as an operating power source of the vehicle 1. The vehicle 1 can further include a controller 102 and a motor 101, and the controller 102 is used to control the battery to supply power to the motor 101, for example, to meet the power demand of the vehicle 1 during starting, navigation and driving.

[0073] In some embodiments of the present application, the battery device 2 can not only be used as an operating power source of the vehicle 1, but also be used as a driving power source of the vehicle 1, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1.

[0074] Figure 2 A structural schematic diagram of a battery device according to an embodiment of the present application is shown.

[0075] The battery device 2 mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells 3 connected in series, in parallel, or in a mixed connection through a busbar component.

[0076] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells 3.

[0077] As an example, the battery cell assembly can be a battery module 201 formed by arranging and fixing a plurality of battery cells 3 into one independent module. As an example, the battery module 201 can be formed by bundling a plurality of battery cells 3 with a cable tie.

[0078] In some embodiments, the battery device can be a battery pack including a box 202 and one or more battery cell assemblies housed in the box 202.

[0079] As an example, the battery cell assembly can be a battery module 201, which can be housed in the box by fixing the battery module 201 in the box.

[0080] As an example, the battery cell assembly can also be housed in the box 202 by directly fixing a plurality of battery cells 3 in the box 202.

[0081] As an example, the box 202 can include a first box 2021 and a second box 2022. The first box 2021 and the second box 2022 are fastened so that an enclosed space is formed inside the box 202 to accommodate the battery cell assembly. The enclosed here means covered or closed, which can be sealed or unsealed. The first box 2021 can be a top cover or a bottom plate.

[0082] As an example, the box 202 can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame so that an enclosed space is formed inside the box 202 to accommodate the battery cell assembly.

[0083] In some embodiments, the box 202 can be part of the chassis structure of the vehicle. For example, part of the box 202 can be at least part of the floor of the vehicle, or part of the box 202 can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0084] Figure 3 A structural schematic diagram of the battery module 201 of an embodiment of the present application is shown.

[0085] In some embodiments, as Figure 2 and Figure 3As shown, the battery cells 3 are multiple, and the multiple battery cells 3 are connected in series or in parallel or in a mixed manner to form a battery module 201. Multiple battery modules 201 are connected in series or in parallel or in a mixed manner to form a whole and are accommodated in the box 202.

[0086] The multiple battery cells 3 in the battery module 201 can be electrically connected through a busbar component to realize parallel connection, series connection or mixed connection of the multiple battery cells 3 in the battery module 201.

[0087] Figure 4 The exploded view of the battery cell is provided in an embodiment of the present application. The battery cell 3 refers to the smallest unit that constitutes a battery device. As shown in the figure, Figure 4 The battery cell 3 includes an end cover assembly 6, a shell 4 and an electrode assembly 5.

[0088] The electrode assembly 5 is a component in which electrochemical reactions occur in the battery cell 3. One or more electrode assemblies 5 can be contained in the shell 4. The electrode assembly 5 is mainly formed by winding or stacking the electrode sheets. The electrode sheets are divided into positive electrode sheets and negative electrode sheets, and a separator is usually arranged between the positive electrode sheets and the negative electrode sheets. The positive electrode sheets and the negative electrode sheets each have a portion of active material constituting an electrode body 52, and each has a portion without active material constituting a tab 51. The positive electrode tab and the negative electrode tab can be located at one end of the electrode body 52 or at two ends of the electrode body 52, respectively. In the charging and discharging process of the battery cell 3, the positive active material and the negative active material react with the electrolyte, and the tab 51 is connected to the electrode terminal 61 to form a current loop.

[0089] The electrode assembly 5 can be a winding structure, a laminated structure or a hybrid structure of winding and laminating.

[0090] In some embodiments, the electrode assembly 5 is a winding structure. The positive electrode sheets and the negative electrode sheets are wound into a winding structure.

[0091] In some embodiments, the electrode assembly 5 is a laminated structure. As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets are alternately and laminatedly arranged, and a plurality of separators are arranged between any adjacent positive electrode sheets or negative electrode sheets, or the separators are continuously arranged by being folded between any adjacent positive electrode sheets or negative electrode sheets.

[0092] In some embodiments, the shape of the electrode assembly 5 can be cylindrical, flat or polygonal.

[0093] In some embodiments, the electrode assembly 5 is provided with a tab, and the tab can guide the current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0094] The battery cell 3 can include a shell 4. The shell 4 is an assembly for fitting the end cover assembly 6 to form an internal environment of the battery cell 3, wherein the formed internal environment can be used to accommodate the electrode assembly 5, electrolyte (not shown in the figure), and other components. The shell 4 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. In some embodiments, the shell 4 can be a sealed structure, or can be a non-sealed structure. As an example, when the shell 4 is a non-sealed structure, the shell 4 serves to protect the electrode assembly 5, and a sealing bag is further included between the shell 4 and the electrode assembly 5, which is used to package the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the shell 4 is a sealed structure, it is used to package the electrode assembly 5, the electrolyte, and other components.

[0095] As an example, the battery cell 3 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes, wherein the prismatic battery cell includes a square battery cell, a blade-shaped battery cell, a multi-prismatic battery cell (such as a hexagonal battery cell, etc.), and the present application is not particularly limited.

[0096] The shell 4 and the end cover assembly 6 can be independent components, and one or more openings 41 can be provided on the shell 4, and the one or more end cover assemblies 6 are used to cover the openings 41 to form the internal environment of the battery cell 3. Alternatively, the end cover assembly 6 and the shell 4 can be integrated. Alternatively, the end cover assembly 6 and the shell 4 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the inside of the shell 4, the end cover assembly 6 is used to cover the shell 4.

[0097] In some embodiments, the electrode terminal 61 can be provided on the end cover assembly 6, or can be provided on the shell 4, and the electrode terminal 61 is electrically connected to the tab 51. The electrode terminal 61 can be directly connected to the tab 51, or can be indirectly connected to the tab 51 through an adapter mechanism.

[0098] Please refer to Figure 5 and Figure 6 , Figure 5 is a structural schematic diagram of a battery cell provided by an embodiment of the present application; Figure 6 is a structural schematic diagram of an insulating assembly of a battery cell provided by an embodiment of the present application.

[0099] In a first aspect, as Figures 4 to 6As shown, the battery cell 3 includes a shell 4, an electrode assembly 5, and an insulation assembly 7. The shell 4 includes a bottom wall 43, a side wall 42, and a cavity with an opening 41 at one end in a first direction X. The electrode assembly 5 is arranged in the cavity. The insulation assembly 7 is arranged on at least part of a surface of the side wall 42 away from the electrode assembly 5. The insulation assembly 7 includes, in sequence, an adhesive layer 71, a first thermal conductive layer 72, and an insulation layer 73. The first thermal conductive layer 72 is arranged between the insulation layer 73 and the adhesive layer 71. The adhesive layer 71 is connected to the side wall 42. The first thermal conductive layer 72 has a thermal conductivity greater than that of the shell 4.

[0100] In the scheme of the embodiment, the battery cell 3 includes the shell 4, the electrode assembly 5, and the insulation assembly 7. The shell 4 includes the bottom wall 43, the side wall 42, and the cavity with the opening 41 at one end in the first direction X. The electrode assembly 5 is arranged in the cavity. The insulation assembly 7 is arranged on at least part of a surface of the shell 4 away from the electrode assembly 5. The insulation assembly 7 is connected to the side wall 42 through the adhesive layer 71 to improve the stability of the insulation assembly 7. The insulation assembly 7 includes the insulation layer 73 to improve the insulation reliability between the shell 4 and the external environment. The insulation assembly 7 further includes the first thermal conductive layer 72 arranged between the insulation layer 73 and the adhesive layer 71. The first thermal conductive layer 72 balances the temperature of the side wall 42 in the first direction X to improve the thermal conductivity between the shell 4 and the external environment, thereby improving the adverse effects of the battery cell 3 caused by excessively high or low temperature on the performance and service life of the battery cell 3.

[0101] Optionally, the battery cell 3 further includes an end cover assembly 6. The shell 4 includes the opening 41 at one end or both ends in the first direction X. The end cover assembly 6 covers the opening 41. The end cover assembly 6 is connected to the electrode assembly 5.

[0102] The insulation assembly 7 includes the adhesive layer 71, the first thermal conductive layer 72, and the insulation layer 73. The adhesive layer 71 and the insulation layer 73 are separately arranged on two sides of the first thermal conductive layer 72 in the thickness direction. The adhesive layer 71, the first thermal conductive layer 72, and the insulation layer 73 are sequentially stacked and pressed into one whole.

[0103] Illustratively, the adhesive layer 71 can be a pressure-sensitive adhesive layer to improve the connection reliability of the insulation assembly 7 and the shell 4. Alternatively, the adhesive layer 71 can be an insulating adhesive layer to improve the insulation performance of the insulation assembly 7. Alternatively, the adhesive layer 71 can be a thermal conductive adhesive layer to improve the thermal conductive performance of the insulation assembly 7.

[0104] Illustratively, the first thermal conductive layer 72 can be a graphite layer, a graphene layer, or a carbon nanotube, etc. The first thermal conductive layer 72 has a thermal conductivity greater than that of the shell 4. The first thermal conductive layer 72 improves the thermal conductive rate between the shell 4 and the external environment.

[0105] Optionally, the first thermal conductive layer 72 has a thickness of 0.01mm to 0.06mm. For example, the first thermal conductive layer 72 has a thickness of 0.01mm, 0.03mm or 0.06mm.

[0106] For example, the insulating layer 73 is a PET (Polyethyleneterephthalate) layer, a PP layer or a PI (Polyimide) layer.

[0107] During the operation of the battery cell 3, the part of the shell 4 close to the end cover assembly 6 has a higher temperature, and the part far from the end cover assembly 6 has a lower temperature. The insulating assembly 7 arranged on the side wall 42 can conduct and balance the temperature of the battery cell 3 in the first direction X.

[0108] Optionally, the insulating assembly 7 extends to both ends of the side wall 42 in the first direction X, so that the insulating assembly 7 can conduct and balance the temperature of the battery cell 3 in the first direction X.

[0109] Optionally, the insulating assembly 7 covers the entire side wall 42 of the shell 4, so as to improve the insulation and thermal conductivity of the battery cell 3.

[0110] In a high-temperature environment, the insulating assembly 7 can quickly transfer the heat of the shell 4 to the external environment, so as to improve the heat accumulation in the shell 4, prevent the battery cell 3 from reaching the current-limiting temperature too quickly, and affect the performance of the battery cell 3. In a low-temperature environment, the insulating assembly 7 can quickly transfer the heat of the external environment to the shell 4, so as to improve the temperature of the battery cell 3, and prevent the capacity and pulse performance of the battery cell 3 from being reduced due to low temperature.

[0111] Please refer to Figure 7 , Figure 7 which is a partial structure schematic diagram of a battery cell provided by an embodiment of the present application.

[0112] In some embodiments, as shown in Figure 4 , Figure 5 and Figure 7 , the battery cell 3 includes at least two insulating assemblies 7. The adjacent two insulating assemblies 7 are a first assembly 74 and a second assembly 75, respectively. The adhesive layer 71 of the first assembly 74 is bonded to the insulating layer 73 of the second assembly 75.

[0113] In these embodiments, the at least two insulating assemblies 7 are connected in a stacked manner, which not only enhances the insulation capability of the battery cell 3, but also improves the thermal conductivity between the battery cell 3 and the external environment.

[0114] For example, the battery cell 3 includes 2 or 3 or 5 insulating assemblies 7. The insulating assemblies 7 are connected in a stacked manner.

[0115] For example, the battery cell 3 comprises two insulation assemblies 7, i.e. a first assembly 74 and a second assembly 75, the adhesive layer 71 of the first assembly 74 is adhered to the insulation layer 73 of the second assembly 75, and the insulation layer 73 of the second assembly 75 is connected to the shell 4.

[0116] For example, the battery cell 3 comprises two insulation assemblies 7, i.e. a first assembly 74 and a second assembly 75, the adhesive layer 71 of the first assembly 74 is adhered to the insulation layer 73 of the second assembly 75, and the insulation layer 73 of the second assembly 75 is connected to the shell 4. Figure 8 Figure 8 is a structural schematic diagram of a battery cell provided by an embodiment of the present application.

[0117] In some embodiments, as shown in Figure 4 Figure 5 and Figure 8 , the insulation assembly 7 also covers at least part of the bottom wall 43.

[0118] In these embodiments, the insulation assembly 7 also covers at least part of the bottom wall 43, which not only enhances the insulation capability of the battery cell 3, but also improves the heat conduction capability between the battery cell 3 and the external environment by providing a larger area of the first heat-conductive layer 72.

[0119] Optionally, the bottom wall 43 of the shell 4 comprises a first part and a second part, the insulation assembly 7 is arranged on the first part, and the bottom wall 43 is connected to the heat exchange mechanism 9 or the box 202 through the second part to improve the stability of the battery cell 3; or the insulation assembly 7 covers the entire side wall 42 and the entire bottom wall 43 to improve the insulation effect of the battery cell 3 and the heat conduction performance of the insulation assembly 7 by increasing the area of the first heat-conductive layer 72.

[0120] For example, the battery cell 3 comprises two insulation assemblies 7, i.e. a first assembly 74 and a second assembly 75, the adhesive layer 71 of the first assembly 74 is adhered to the insulation layer 73 of the second assembly 75, and the insulation layer 73 of the second assembly 75 is connected to the shell 4. Figure 9 Figure 10 and Figure 11 , Figure 9 is a partial structural schematic diagram of a battery cell provided by an embodiment of the present application. Figure 10 is a sectional view of A-A in Figure 5 provided by an embodiment of the present application. Figure 11 is a sectional view of A-A in Figure 5 provided by another embodiment of the present application.

[0121] In some embodiments, as shown in Figures 9 to 11 , the battery cell 3 further comprises a second heat-conductive layer 8, the second heat-conductive layer 8 is arranged on at least part of the surface of the shell 4, the thermal conductivity of the second heat-conductive layer 8 is greater than that of the shell 4, the second heat-conductive layer 8 is arranged separately from the insulation assembly 7, or the adhesive layer 71 of the insulation assembly 7 is connected to at least part of the second heat-conductive layer 8.

[0122] ​​​In the embodiments, the second heat-conductive layer 8 is arranged on at least part of the surface of the shell 4 to improve the heat-conducting capacity between the shell 4 and the external environment, so as to solve the problem that the performance and service life of the battery cell 3 are adversely affected due to the excessively high or low temperature of the battery cell 3.

[0123] The thermal conductivity of the second heat-conductive layer 8 is greater than that of the shell 4, and the second heat-conductive layer 8 is coated or bonded on the surface of the shell 4 to improve the heat-conducting capacity of the shell 4.

[0124] For example, the material of the second heat-conductive layer 8 includes graphite, graphene, carbon nanometer, etc., so that the heat-conducting rate of the shell 4 can be improved by the second heat-conductive layer 8.

[0125] Optionally, the second heat-conductive layer 8 is arranged on the side wall 42 of the shell 4 to improve the heat-conducting capacity of the side wall 42 of the shell 4, and / or the second heat-conductive layer 8 is arranged on the bottom wall 43 of the shell 4 to improve the heat-conducting capacity of the bottom wall 43 of the shell 4.

[0126] Optionally, the shape and area of the second heat-conductive layer 8 arranged on the outer surface of the shell 4 can be designed by itself, for example, the second heat-conductive layer 8 is in the shape of a rectangle or a circle, etc.

[0127] Optionally, the second heat-conductive layer 8 and the insulating component 7 are arranged on the outer surface of the shell 4 in a spaced manner, the insulating component 7 is bonded to the shell 4, for example, the insulating component 7 is wrapped on the side wall 42 of the shell 4, and the second heat-conductive layer 8 is arranged on the bottom wall 43 of the shell 4; or as shown in Figure 10 , the second heat-conductive layer 8 and the insulating component 7 are arranged on the two side surfaces of the shell 4 in the thickness direction thereof in a separated manner, and the insulating component 7 is bonded to the shell 4; or as shown in Figure 11 , the second heat-conductive layer 8 and the insulating component 7 are both arranged on the outer surface of the shell 4, at least part of the second heat-conductive layer 8 is arranged between the insulating component 7 and the shell 4, and at least part of the insulating component 7 is connected to the shell 4 through the second heat-conductive layer 8. The outer surface of the shell 4 refers to the side surface of the shell 4 away from the cavity in the thickness direction thereof.

[0128] Optionally, the second heat-conductive layer 8 covers the outer surface of the shell 4, and / or the second heat-conductive layer 8 covers the inner surface of the shell 4. The inner surface of the shell 4 refers to the side surface of the shell 4 toward the cavity in the thickness direction thereof.

[0129] Optionally, the second heat-conductive layer 8 covers the inner surface of the shell 4, and the surface of the second heat-conductive layer 8 is covered with an insulating heat-conductive material to improve the insulation reliability of the shell 4, the second heat-conductive layer 8 and the electrode assembly 5. For example, the insulating heat-conductive material can be a heat-conductive silica gel sheet, etc.

[0130] Optionally, the second thermal conductive layer 8 has a thickness of 10-30 μm. For example, the second thermal conductive layer 8 has a thickness of 10 μm, 20 μm or 30 μm.

[0131] In some embodiments, as shown in Figures 9 to 11 , the second thermal conductive layer 8 is arranged along its thickness direction to at least partially overlap the projection of the housing 4 on the plane, and the projection of the insulation assembly 7 on the plane along its thickness direction.

[0132] In these embodiments, the second thermal conductive layer 8 is arranged along its thickness direction to at least partially overlap the projection of the housing 4 on the plane, and the projection of the insulation assembly 7 on the plane along its thickness direction, so as to enhance the thermal conductivity of at least part of the housing 4.

[0133] Optionally, as shown in Figure 10 , the second thermal conductive layer 8 is arranged on the outer surface of the housing 4, at least part of the second thermal conductive layer 8 is located between the housing 4 and the insulation assembly 7, at least part of the adhesive layer 71 of the insulation assembly 7 is adhered to the second thermal conductive layer 8 and connected through the second thermal conductive layer 8 and the housing 4, so that the heat in the chamber is sequentially exchanged with the external environment through the housing 4, the second thermal conductive layer 8 and the insulation assembly 7; or as shown in Figure 11 , the insulation assembly 7 is arranged on the outer surface of the housing 4, at least part of the second thermal conductive layer 8 is arranged on the inner surface of the housing 4, and at least part of the second thermal conductive layer 8 is arranged opposite to the insulation assembly 7 along the thickness direction of the housing 4, so that the heat in the chamber is sequentially exchanged with the external environment through the second thermal conductive layer 8, the housing 4 and the insulation assembly 7.

[0134] For example, the insulation assembly 7 is arranged on the outer surface of the sidewall 42, the second thermal conductive layer 8 is arranged on the entire outer surface of the sidewall 42, the insulation assembly 7 is adhered to the second thermal conductive layer 8 and connected through the second thermal conductive layer 8 and the housing 4; or the insulation assembly 7 is arranged on the outer surface of the sidewall 42, the second thermal conductive layer 8 is arranged on the entire inner surface of the sidewall 42, and the insulation assembly 7 is adhered to the outer surface of the sidewall 42.

[0135] Please refer to Figure 12 , Figure 12 , which is a partial structure diagram of a battery cell provided in an embodiment of the present application.

[0136] In some embodiments, as shown in Figure 10 and Figure 12 , the second thermal conductive layer 8 is arranged on the side surface of the housing 4 away from the chamber, and the adhesive layer 71 is connected with the second thermal conductive layer 8.

[0137] In these embodiments, the second thermal conductive layer 8 is arranged on the side surface of the housing 4 away from the chamber, and the adhesive layer 71 is connected with the second thermal conductive layer 8, so as to reduce the risk that the second thermal conductive layer 8 is easily fallen into the electrolyte after being damaged, and thus the battery cell 3 is damaged.

[0138] The second heat-conducting layer 8 is disposed on the side surface of the side wall 42 away from the chamber, and / or the second heat-conducting layer 8 is disposed on the side surface of the bottom wall 43 away from the chamber.

[0139] Optionally, the second heat-conducting layer 8 extends along the first direction X on the side surface of the sidewall 42 away from the chamber, so that the second heat-conducting layer 8 can equalize the temperature of the shell 4 in the first direction X.

[0140] Please see Figure 13 , Figure 13 This is a partial structural schematic diagram of a battery cell provided in one embodiment of this application.

[0141] In some embodiments, such as Figure 10 and Figure 13 As shown, the sidewall 42 includes two first sidewalls 421 and two second sidewalls 422. The two first sidewalls 421 are arranged opposite each other in the second direction Y, and the two second sidewalls 422 are arranged opposite each other in the third direction Z. The first direction X, the second direction Y and the third direction Z intersect each other. The area of ​​the first sidewall 421 is larger than the area of ​​the second sidewall 422. The second heat-conducting layer 8 is disposed on the side of the first sidewall 421 away from the chamber, and / or the second heat-conducting layer 8 is disposed on the side of the second sidewall 422 facing the chamber.

[0142] In these embodiments, the second thermally conductive layer 8 is disposed on the side of the first sidewall 421 away from the cavity to reduce the risk of the second thermally conductive layer 8 being crushed by the electrode assembly 5 and to enhance the thermal conductivity rate between the housing 4 and the external environment, and / or the second thermally conductive layer 8 is disposed on the side of the second sidewall 422 facing the cavity to enhance the thermal conductivity rate between the electrode assembly 5 and the housing 4, and to improve the problem that the second thermally conductive layer 8 disposed on the outer surface of the housing 4 is easily damaged by scratches, bumps and other reasons.

[0143] During the operation of the battery cell 3, the electrode assembly 5 will expand and deform. The area of ​​the first sidewall 421 is larger than the area of ​​the second sidewall 422. The first sidewall 421 is the larger surface of the battery cell 3. The pressure exerted by the electrode assembly 5 on the first sidewall 421 is greater than the pressure exerted on the second sidewall 422. Therefore, the second heat-conducting layer 8, which is disposed on the first sidewall 421, is disposed on the side of the first sidewall 421 away from the cavity, in order to improve the problem of it being directly squeezed by the electrode assembly 5 and being damaged and falling off due to excessive force. The second heat-conducting layer 8, which is disposed on the second sidewall 422, is disposed on the side of the second sidewall 422 facing the cavity. The second heat-conducting layer 8 is closer to the electrode assembly 5. The second heat-conducting layer 8 disposed on the second sidewall 422 helps to accelerate the rate of heat transfer from the cavity to the outside.

[0144] Optionally, the second heat-conductive layer 8 extends along the first direction X on the second side wall 422, and the second heat-conductive layer 8 can be used to balance the temperature of the electrode assembly 5 in the first direction X.

[0145] In some embodiments, as shown in Figure 9 , the second heat-conductive layer 8 comprises heat-conductive material and adhesive material mixed with each other, the heat-conductive material has a higher thermal conductivity than the shell 4, and the second heat-conductive layer 8 is adhered to the shell 4 by the adhesive material.

[0146] In these embodiments, the second heat-conductive layer 8 comprises heat-conductive material and adhesive material mixed with each other, the heat-conductive material has a higher thermal conductivity than the shell 4, so that the second heat-conductive layer 8 has a uniform heat-conductive capacity everywhere.

[0147] Optionally, the mass of the heat-conductive material is 40%-50% of the mass of the second heat-conductive layer 8, so as to enhance the heat-conductive rate of the second heat-conductive layer 8 and improve the connection reliability of the second heat-conductive layer 8 and the shell 4. For example, the mass of the heat-conductive material is 40%, 45%, 50%, or the like of the mass of the second heat-conductive layer 8.

[0148] Optionally, the heat-conductive material can be graphene oxide, graphite, graphene, carbon nanotube, or the like. The adhesive material can be epoxy resin, acrylic resin, or the like.

[0149] Optionally, the second heat-conductive layer 8 further comprises low-surface-energy organic matter, the low-surface-energy organic matter is used to reduce the surface tension of the paint of the second heat-conductive layer 8, so that the paint of the second heat-conductive layer 8 is better adhered to the surface of the shell 4. For example, the low-surface-energy organic matter can be polytetrafluoroethylene, polyethylene, polypropylene, or the like.

[0150] Optionally, the second heat-conductive layer 8 comprises an adhesive layer and a heat transfer layer, the adhesive layer is arranged between the heat transfer layer and the shell 4, and the heat transfer layer is fixed to the surface of the shell 4 by the adhesive layer. The material of the heat transfer layer can be graphene oxide, graphite, graphene, carbon nanotube, or the like.

[0151] In some embodiments, as shown in Figure 5 , Figure 12 and Figure 13 , the shell 4 comprises a first edge 45 close to the opening 41, and the second heat-conductive layer 8 and the first edge 45 are arranged in the first direction X.

[0152] In these embodiments, the shell 4 comprises a first edge 45 close to the opening 41, and the second heat-conductive layer 8 and the first edge 45 are arranged in the first direction X, so as to reduce the damage to the second heat-conductive layer 8 when the shell 4 and the end cover assembly 6 are welded, and improve the reliability of the battery monomer 3.

[0153] The battery cell 3 further comprises an end cover assembly 6 which covers the opening 41 to form a sealed cavity containing the electrode assembly 5, and the end cover assembly 6 is welded to the shell 4. The first edge 45 refers to an edge of the shell 4 on a side close to the opening 41 in the first direction X. During the welding of the end cover assembly 6 to the shell 4, the welding position is located between the first edge 45 and the end cover assembly 6. The second heat-conductive layer 8 is arranged apart from the first edge 45 in the first direction X. Therefore, the distance between the welding position and the second heat-conductive layer 8 is increased, and the influence of the welding process on the second heat-conductive layer 8 is reduced.

[0154] For example, the second heat-conductive layer 8 is arranged on the side wall 42. The second heat-conductive layer 8 is arranged apart from the first edge 45 on a side close to the opening 41 in the first direction X. The second heat-conductive layer 8 is arranged on a side away from the opening 41 on the other end of the second heat-conductive layer 8 in the first direction X. The second heat-conductive layer 8 is arranged to overlap with the side edge of the side wall 42. In this way, the area of the second heat-conductive layer 8 is increased, and the heat-conductive rate of the shell 4 is improved.

[0155] In some embodiments, as shown in Figure 5 , Figure 12 and Figure 13 , the distance L between the second heat-conductive layer 8 and the first edge 45 in the first direction X satisfies 5mm≤L≤10mm.

[0156] In these embodiments, when the distance L between the second heat-conductive layer 8 and the first edge 45 in the first direction X satisfies the above condition, the problem that the second heat-conductive layer 8 is easily damaged during the welding of the shell 4 and the end cover assembly 6 due to the small distance between the second heat-conductive layer 8 and the first edge 45 is improved. The problem that the heat-conductive capacity of the shell 4 is insufficient due to the small area of the second heat-conductive layer 8 caused by the large distance between the second heat-conductive layer 8 and the first edge 45 is also improved.

[0157] For example, the distance L between the second heat-conductive layer 8 and the first edge 45 in the first direction X can be 5mm, 7.5mm, 8mm, 10mm, etc.

[0158] In a second aspect, as shown in Figure 2 , Figure 3 and Figure 5 , the embodiments of the present application provide a battery device 2 comprising the battery cell 3 of the first aspect.

[0159] In the scheme of the embodiments of the present application, the battery cell 3 comprises the insulating assembly 7 arranged on at least part of the surface of the shell 4 away from the electrode assembly 5. The first heat-conductive layer 72 in the insulating assembly 7 is used to improve the heat-conductive capacity between the battery cell 3 and the external environment, and to improve the performance of the battery cell 3 and the battery device 2.

[0160] Since the battery device 2 provided by the second aspect of the present application comprises the battery cell 3 of any of the embodiments of the first aspect, the battery device 2 provided by the second aspect of the present application has the beneficial effects of the battery cell 3 of any of the embodiments of the first aspect, which will not be repeated here.

[0161] Please refer to Figure 14 , Figure 14 is a partial structural schematic diagram of a battery device provided by an embodiment of the present application.

[0162] In some embodiments, as shown in Figure 14 , the battery device further comprises a heat exchange mechanism 9, and the battery cell 3 further comprises a second heat conduction layer 8, which is arranged on the side of the bottom wall 43 away from the electrode assembly 5, and is exposed to the insulation assembly 7 and connected with the heat exchange mechanism 9.

[0163] In these embodiments, the second heat conduction layer 8 is arranged on the side of the bottom wall 43 away from the electrode assembly 5, and the second heat conduction layer 8 is exposed to the insulation assembly 7 and connected with the heat exchange mechanism 9, so as to improve the heat conduction capacity of the bottom wall 43 and the heat exchange mechanism 9, and to improve the problem that the performance and service life of the battery cell 3 are adversely affected due to the excessively high or low temperature of the battery cell 3.

[0164] For example, the heat exchange mechanism 9 can be a liquid cooling plate, a phase change heat dissipation plate, or a heat plate, etc.

[0165] For example, the insulation assembly 7 is wrapped on the side wall 42, the second heat conduction layer 8 is arranged on the side of the bottom wall 43 away from the cavity, and the shell 4 contacts and exchanges heat with the heat exchange mechanism 9 through the second heat conduction layer 8; or the bottom wall 43 comprises a first part and a second part, the insulation assembly 7 is wrapped on the side wall 42 and the first part of the bottom wall 43, the second part of the bottom wall 43 is provided with the second heat conduction layer 8, and the bottom wall 43 is connected with the heat exchange mechanism 9 through the second heat conduction layer 8, for example, the first part is arranged around the second part.

[0166] Thirdly, an embodiment of the present application provides a power consumption device comprising the battery device of the second aspect of the present application.

[0167] In some embodiments, as shown in Figures 1 to 14As shown, the battery monomer 3 comprises a shell 4, an electrode assembly 5, an insulation assembly 7 and a second thermal conductive layer 8, the shell 4 comprises a bottom wall 43, a side wall 42 and a cavity 41 open at one end in the first direction X enclosed by the bottom wall 43 and the side wall 42; the electrode assembly 5 is arranged in the cavity; the insulation assembly 7 is arranged on the side of the side wall 42 away from the electrode assembly 5, the insulation assembly 7 comprises a bonding layer 71, a first thermal conductive layer 72 and an insulation layer 73 stacked in sequence, the first thermal conductive layer 72 is arranged between the insulation layer 73 and the bonding layer 71, the bonding layer 71 is connected with the side wall 42, the thermal conductivity of the first thermal conductive layer 72 is greater than that of the shell 4, the battery monomer 3 comprises at least two insulation assemblies 7, the adjacent two insulation assemblies 7 are respectively a first assembly 74 and a second assembly 75, the bonding layer 71 of the first assembly 74 is bonded to the insulation layer 73 of the second assembly 75, the second thermal conductive layer 8 comprises a thermal conductive material and a bonding material mixed with each other, the thermal conductivity of the thermal conductive material is greater than that of the shell 4, the second thermal conductive layer 8 is bonded to the shell 4 through the bonding material, the second thermal conductive layer 8 is arranged on the side surface of the shell 4 away from the cavity, the thermal conductivity of the second thermal conductive layer 8 is greater than that of the shell 4, the second thermal conductive layer 8 is arranged on at least part of the surface of the shell 4, the second thermal conductive layer 8 and the insulation assembly 7 are arranged in a spaced manner, or the bonding layer 71 of the insulation assembly 7 is connected with at least part of the second thermal conductive layer 8.

[0168] In these embodiments, the battery monomer 3 comprises a shell 4, an electrode assembly 5 and an insulation assembly 7, the shell 4 comprises a bottom wall 43, a side wall 42 and a cavity 41 open at one end in the first direction X enclosed by the bottom wall 43 and the side wall 42; the electrode assembly 5 is arranged in the cavity, the insulation assembly 7 is arranged on at least part of the surface of the shell 4 away from the electrode assembly 5, the insulation assembly 7 is connected with the side wall 42 through the bonding layer 71 to improve the stability of the insulation assembly 7, the insulation assembly 7 comprises an insulation layer 73 to improve the insulation reliability between the shell 4 and the external environment, and the insulation assembly 7 further comprises a first thermal conductive layer 72 arranged between the insulation layer 73 and the bonding layer 71, the temperature of the side wall 42 in the first direction X is balanced through the first thermal conductive layer 72, the heat conduction capacity between the shell 4 and the external environment is improved, and the problem that the performance and service life of the battery monomer 3 are adversely affected due to the excessively high or low temperature of the battery monomer 3 is solved.

[0169] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present 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 cell, characterized in that, include: The housing includes a bottom wall, side walls, and a cavity enclosed by the bottom wall and the side walls, which opens at one end in a first direction; Electrode assemblies are disposed within the cavity; An insulating component is disposed on at least a portion of the surface of the sidewall facing away from the electrode assembly. The insulating component includes an adhesive layer, a first thermally conductive layer, and an insulating layer stacked sequentially. The first thermally conductive layer is disposed between the insulating layer and the adhesive layer. The adhesive layer is connected to the sidewall. The thermal conductivity of the first thermally conductive layer is greater than that of the housing.

2. The battery cell according to claim 1, characterized in that, The battery cell further includes a second thermally conductive layer, which is disposed on at least a portion of the surface of the housing. The thermal conductivity of the second thermally conductive layer is greater than that of the housing. The second thermally conductive layer and the insulating component are spaced apart, or the adhesive layer of the insulating component is connected to at least a portion of the second thermally conductive layer.

3. The battery cell according to claim 2, characterized in that, The projection of the second thermally conductive layer along its thickness direction onto the housing and the projection of the insulating component along its thickness direction onto the housing at least partially overlap.

4. The battery cell according to claim 2 or 3, characterized in that, The housing includes a first edge near the opening, and the second thermally conductive layer and the first edge are spaced apart in the first direction.

5. The battery cell according to claim 4, characterized in that, The distance L between the second thermally conductive layer and the first edge in the first direction satisfies 5mm≤L≤10mm.

6. The battery cell according to claim 2, characterized in that, The second thermally conductive layer comprises a mixture of thermally conductive material and an adhesive material, wherein the thermal conductivity of the thermally conductive material is greater than that of the shell, and the second thermally conductive layer is bonded to the shell by the adhesive material.

7. The battery cell according to claim 2, characterized in that, The second thermally conductive layer is disposed on the side surface of the housing opposite to the cavity, and the adhesive layer is connected to the second thermally conductive layer.

8. The battery cell according to claim 2, characterized in that, The sidewall includes two first sidewalls and two second sidewalls. The two first sidewalls are arranged opposite each other in a second direction, and the two second sidewalls are arranged opposite each other in a third direction. The first direction, the second direction, and the third direction intersect each other. The area of ​​the first sidewall is larger than the area of ​​the second sidewall. The second thermally conductive layer is disposed on the side of the first sidewall away from the cavity, and / or the second thermally conductive layer is disposed on the side of the second sidewall facing the cavity.

9. The battery cell according to claim 1, characterized in that, The battery cell includes at least two insulating components, with two adjacent insulating components being a first component and a second component, respectively, and the adhesive layer of the first component being bonded to the insulating layer of the second component.

10. The battery cell according to claim 1, characterized in that, The insulating component also covers at least a portion of the bottom wall.

11. A battery device, characterized in that, Includes the battery cell described in any one of claims 1-10 above.

12. The battery device according to claim 11, characterized in that, The battery device further includes a heat exchange mechanism, and the battery cell further includes a second thermally conductive layer. The second thermally conductive layer is disposed on the side of the bottom wall away from the electrode assembly. The second thermally conductive layer is exposed on the insulating assembly and connected to the heat exchange mechanism.

13. An electrical appliance, characterized in that, Includes the battery device described in claim 11 or 12 above.

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