Battery cell, battery device, and electric device

Abstract

The application relates to the technical field of battery production, in particular to a battery monomer, a battery device and a power utilization equipment. The battery monomer comprises a shell, an electrode assembly and an insulating piece, the shell comprises a containing cavity, the electrode assembly comprises a first surface facing the shell; an insulating piece is arranged in at least part of the space between the first surface and the shell, wherein the insulating piece comprises a substrate layer, a heat conduction layer and an adhesive layer which are sequentially arranged in the thickness direction of the insulating piece, and the adhesive layer is arranged in close contact with the electrode assembly. The battery monomer of the embodiment of the application can enhance the heat conduction performance of the insulating piece through the heat conduction layer, so that the heat of the electrode assembly is quickly transferred to the shell through the insulating piece, the heat dissipation efficiency of the electrode assembly is improved, and the temperature of the electrode assembly is quickly reduced.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a battery cell, battery device, and electrical equipment. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] With the increasing maturity of new energy technologies, new energy vehicles and other electrical equipment are gradually entering the public eye. The core technology of new energy vehicles lies in the battery device, and the safety and stability of the battery device directly determine the performance of the entire vehicle.

[0004] A battery cell includes an electrode assembly, an insulator, and a housing. The electrode assembly is located in the housing cavity, and the insulator is located between the electrode assembly and the housing, which cannot quickly reduce the temperature of the electrode assembly. Utility Model Content

[0005] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, which solves the problem that the battery cell in the prior art cannot quickly reduce the temperature of the electrode assembly.

[0006] A first aspect of the embodiments of this application provides a battery cell comprising:

[0007] The housing includes a receiving cavity;

[0008] An electrode assembly, disposed within the accommodating cavity, the electrode assembly including a first surface facing the housing; and

[0009] An insulating component is provided in at least a portion of the space between the first surface and the housing. The insulating component includes a substrate layer, a thermally conductive layer, and an adhesive layer stacked sequentially along its thickness direction. The adhesive layer is attached to the electrode assembly.

[0010] The battery cell of this application embodiment includes an electrode assembly, a housing, and an insulating member. The housing includes a cavity, the electrode assembly includes a first surface facing the housing, and an insulating member is provided in at least a portion of the space between the first surface and the housing. The insulating member includes a substrate layer, a thermally conductive layer, and an adhesive layer stacked sequentially along its thickness direction. The adhesive layer is attached to the electrode assembly. The thermally conductive layer enhances the heat transfer performance of the insulating member, allowing the heat of the electrode assembly to be quickly transferred to the housing through the insulating member, thereby improving the heat dissipation efficiency of the electrode assembly and rapidly reducing the temperature of the electrode assembly.

[0011] In some embodiments of this application, the thermally conductive layer includes a graphite coating, the entire orthographic projection of the graphite coating toward the substrate layer being located on the substrate layer, and the entire orthographic projection of the graphite coating toward the adhesive layer being located on the adhesive layer.

[0012] In the embodiments of this application, by including a graphite coating in the thermally conductive layer, with the entire orthographic projection of the graphite coating toward the substrate layer located on the substrate layer and the entire orthographic projection of the graphite coating toward the adhesive layer located on the adhesive layer, the substrate layer can completely cover the surface of the graphite coating, and the adhesive layer can completely cover the surface of the graphite coating. This allows the circumferential edges of the substrate layer and the adhesive layer to seal the graphite coating, reducing the probability of decarburization and corrosion of the casing when the insulating component is immersed in the electrolyte.

[0013] In some embodiments of this application, the circumferential edge of the graphite coating is located inside the circumferential edge of the substrate layer, and / or the circumferential edge of the graphite coating is located inside the circumferential edge of the adhesive layer.

[0014] In the embodiments of this application, the circumferential edge of the graphite coating is located inside the circumferential edge of the substrate layer, and / or the circumferential edge of the graphite coating is located inside the circumferential edge of the adhesive layer. This allows the circumferential edges of both the substrate layer and the adhesive layer to be located outside the circumferential edge of the graphite coating. This enables the circumferential edges of the substrate layer and the adhesive layer to provide a better sealing effect for the graphite coating, reducing the probability of decarburization of the insulating component when immersed in the electrolyte, thereby corroding the casing.

[0015] In some embodiments of this application, the thermally conductive layer includes an encapsulation, the interior of which is provided with graphite.

[0016] The embodiments of this application include a thermal conductive layer comprising a package, and the package contains graphite. This allows the graphite to be placed inside the package, giving the thermal conductive layer thermal conductivity. This enables the heat from the battery cell to be transferred to the casing as quickly as possible, and also enables the encapsulation of the graphite, reducing the probability of decarburization of the insulating component when immersed in the electrolyte, thereby corroding the casing.

[0017] In some embodiments of this application, the encapsulation includes a polymer material component.

[0018] The embodiments of this application include a polymer material component in the encapsulation. Due to the good sealing performance of polymer materials, the thickness of the encapsulation can be reduced, thereby reducing the weight of the encapsulation, reducing the space occupied inside the casing, and reducing the weight of the battery cell.

[0019] In some embodiments of this application, the electrode assembly further includes a second surface, the first surface is disposed along the height direction of the battery cell, the second surface intersects with the first surface and is disposed facing the housing, and an insulating element is provided in at least a portion of the space between the second surface and the housing.

[0020] The embodiments of this application further include a second surface in the electrode assembly, which intersects with the first surface and is disposed facing the housing. An insulating element is provided in at least a portion of the space between the second surface and the housing. This allows for the provision of an insulating element in at least a portion of the space between the second surface of the electrode assembly and the housing, thereby enhancing the heat transfer efficiency between the electrode assembly and the bottom of the housing and thus reducing the temperature of the electrode assembly more quickly.

[0021] In some embodiments of this application, an identification code is provided on the surface of the thermally conductive layer facing the adhesive layer, and a first through hole is provided on the adhesive layer opposite to the identification code.

[0022] The embodiments of this application provide an identification code on the surface of the thermally conductive layer facing the adhesive layer, and the adhesive layer has a first through hole that is opposite to the identification code. This allows users to easily see the identification code on the thermally conductive layer through the first through hole, facilitating the traceability of individual battery cells.

[0023] In some embodiments of this application, the identification code is applied to the thermally conductive layer by spraying.

[0024] The embodiments of this application, by spraying the identification code onto the heat-conducting layer, can form the identification code on the heat-conducting layer using inkjet printing, which makes the printed content clear, durable, and not easily worn or faded.

[0025] In some embodiments of this application, the substrate layer is provided with an identification code, the thermally conductive layer is provided with a first clearance hole opposite to the identification code, and the adhesive layer is provided with a first through hole opposite to the first clearance hole.

[0026] The embodiments of this application provide an identification code on the substrate layer, a first clearance hole on the thermal conductive layer opposite to the identification code, and a first through hole on the adhesive layer opposite to the first clearance hole. This allows users to easily see the identification code on the substrate layer through the first through hole and the first clearance hole, facilitating the traceability of individual battery cells.

[0027] In some embodiments of this application, the thickness of the thermally conductive layer is greater than or equal to the thickness of the adhesive layer.

[0028] The embodiments of this application, by making the thickness of the thermally conductive layer greater than or equal to the thickness of the adhesive layer, enable the insulating component to have high thermal conductivity and facilitate manufacturing.

[0029] In some embodiments of this application, the ratio of the thickness of the thermally conductive layer to the thickness of the adhesive layer is between 1 and 2.

[0030] The embodiments of this application control the ratio of the thickness of the thermally conductive layer to the thickness of the adhesive layer between 1 and 2, which enables the insulating component to have high thermal conductivity and is easy to manufacture.

[0031] In some embodiments of this application, the thickness of the substrate layer is greater than or equal to the sum of the thicknesses of the thermally conductive layer and the adhesive layer.

[0032] The embodiments of this application improve the safety of the insulating component by making the thickness of the substrate layer greater than or equal to the sum of the thicknesses of the thermally conductive layer and the adhesive layer, thus preventing mechanical damage to the insulating component that could lead to graphite leakage.

[0033] In some embodiments of this application, the battery cell further includes a Mylar membrane, and an insulating element is disposed between the electrode assembly and the Mylar membrane.

[0034] In the embodiments of this application, by placing an insulating element between the electrode assembly and the Mylar membrane, the heat of the electrode assembly can be transferred to the housing through the insulating element and the Mylar membrane, thereby dissipating heat through the housing and improving the heat dissipation efficiency of the battery cell.

[0035] A second aspect of the embodiments of this application provides a battery device comprising at least one battery cell mentioned in the above embodiments.

[0036] A third aspect of the embodiments of this application provides an electrical device that includes the battery device mentioned in the above embodiments, the battery device being used to supply power to the electrical device.

[0037] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0038] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0039] Figure 1 This application provides a schematic diagram of the structure of an electrical device according to some embodiments;

[0040] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0041] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0042] Figure 4 for Figure 3The diagram shows the structure of the electrode assembly and insulating components of the battery cell.

[0043] Figure 5 An exploded structural diagram of an insulating component provided in some embodiments of this application;

[0044] Figure 6 This is another exploded structural diagram of the insulating element provided in some embodiments of this application;

[0045] Figure 7 An exploded structural diagram of the interior of a Mylar membrane provided for some embodiments of this application (showing an insulating component located below the electrode assembly).

[0046] The attached figures are labeled as follows:

[0047] 1000, Vehicle; 100, Battery unit; 200, Controller; 300, Motor;

[0048] 10. Battery cell; 11. Electrode assembly; 111. First surface; 112. Second surface; 113. Top cover; 12. Housing; 121. Receiving cavity; 13. Insulating component; 131. Substrate layer; 132. Thermally conductive layer; 1321. Graphite coating; 1322. Encapsulation component; 13221. Encapsulation area; 13222. Graphite area; 1323. First clearance hole; 133. Adhesive layer; 134. Identification code; 1331. First through hole; 14. Mylar film;

[0049] 20. Battery housing; 21. First housing; 22. Second housing; 23. Storage space;

[0050] XX, the length direction of the battery cell;

[0051] YY, the width direction of the battery cell;

[0052] ZZ, the height direction of a single battery cell. Detailed Implementation

[0053] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0055] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0056] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0057] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0058] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0059] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0060] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0061] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0062] The battery devices described in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. Such electrical equipment can be composed of battery cells and battery devices as described in this application.

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

[0064] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all batteries including housings and electrical equipment using batteries.

[0065] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0066] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0067] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0068] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0069] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0070] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0071] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0072] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

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

[0074] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. Current collectors without the positive active material layer protrude beyond those with the coating. These uncoated current collectors are stacked together to form the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. Current collectors without the negative active material layer protrude beyond those with the coating. These uncoated current collectors are stacked together to form the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0075] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0076] A battery cell includes an electrode assembly, an insulator, and a housing. The electrode assembly is located in the housing cavity, and the insulator is located between the electrode assembly and the housing, which cannot quickly reduce the temperature of the electrode assembly.

[0077] To address this problem, embodiments of this application propose a battery cell comprising an electrode assembly, a housing, and an insulating component. The housing includes a accommodating cavity, and the electrode assembly includes a first surface facing the housing. An insulating component is disposed within at least a portion of the space between the first surface and the housing. The insulating component includes a substrate layer, a thermally conductive layer, and an adhesive layer sequentially stacked along its thickness direction. The adhesive layer is bonded to the electrode assembly. The thermally conductive layer enhances the heat transfer performance of the insulating component, allowing the heat from the electrode assembly to be quickly transferred to the housing through the insulating component, thereby improving the heat dissipation efficiency of the electrode assembly and rapidly reducing the temperature of the electrode assembly.

[0078] The battery cells in the embodiments of this application can be used in electrical equipment such as vehicles, or can be installed in electrical equipment where battery cells need to be installed in advance.

[0079] The structures in the embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0080] Combination Figure 1 As shown, vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of vehicle 1000. The battery device 100 can be used to power vehicle 1000; for example, the battery device 100 can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

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

[0082] like Figure 2 As shown, an embodiment of this application also provides a battery device 100, including a battery housing 20 and a battery cell 10. The battery housing 20 has a receiving space 23, and the battery cell 10 is installed in the receiving space 23.

[0083] In some embodiments, such as Figure 2 As shown, the battery housing 20 may include a first housing 21 and a second housing 22, which overlap each other, together defining a receiving space 23 for accommodating the battery cell 10. Both the first housing 21 and the second housing 22 can be hollow structures with one open end, with the second housing 22 covering the open side of the first housing 21, so that the first housing 21 and the second housing 22 together define the receiving space; alternatively, the second housing 22 can be a plate-like structure, and the first housing 21 can be a hollow structure with one open side, with the open side of the second housing 22 covering the open side of the first housing 21. Of course, the battery housing 20 formed by the first housing 21 and the second housing 22 can be of various shapes, such as a cylinder, a cuboid, etc.

[0084] like Figure 3 As shown, the battery cell 10 also includes an electrode assembly 11, a housing 12, and an insulator 13. The electrode assembly 11 includes a first surface 111 facing the housing 12. The housing 12 includes a receiving cavity 121. The insulator 13 is disposed in at least a portion of the space between the first surface 111 and the housing 12. As shown, Figure 5 and Figure 6As shown, the insulating component 13 includes a substrate layer 131, a thermally conductive layer 132 and an adhesive layer 133 stacked sequentially along its own thickness direction. The adhesive layer 133 is attached to the electrode assembly 11, and the substrate layer 131 is disposed facing the housing 12.

[0085] The first surface 111 here can be the side or bottom surface of the electrode assembly 11. The bottom surface is located at the bottom of the electrode assembly 11. When the insulating member 13 is located below the electrode assembly 11, the identification code for identifying the battery cell 10 can also be set on the insulating member 13. When the insulating member 13 is located to the side of the electrode assembly 11, the identification code of the battery cell 10 can be set on the insulating member 13 located on the side. The battery cell 10 of this application embodiment includes an electrode assembly 11, a housing 12, and an insulating member 13. The electrode assembly 11 includes a first surface 111 facing the housing 12. An insulating member 13 is provided in at least a portion of the space between the first surface 111 and the housing 12. The insulating member 13 includes a substrate layer 131, a thermally conductive layer 132, and an adhesive layer 133 stacked sequentially along its thickness direction. The adhesive layer 133 is attached to the electrode assembly 11. The thermally conductive layer 132 enhances the heat transfer performance of the insulating member 13, allowing the heat of the electrode assembly 11 to be quickly transferred to the housing 12 through the insulating member 13, thereby improving the heat dissipation efficiency of the electrode assembly 11 and rapidly reducing the temperature of the electrode assembly 11.

[0086] Optionally, the battery cell 10 also includes a Mylar membrane 14, with an insulating member 13 disposed between the electrode assembly 11 and the Mylar membrane 14.

[0087] Mylar film 14 is a polyester film made of polymer material. It has high reflectivity and heat insulation properties. Mylar film 14 is located inside the shell 12 and can play an insulating role.

[0088] In the embodiments of this application, by placing the insulating member 13 between the electrode assembly 11 and the Mylar membrane 14, the heat of the electrode assembly 11 can be transferred to the housing 12 through the insulating member 13 and the Mylar membrane 14, thereby dissipating heat through the housing 12 and improving the heat dissipation efficiency of the battery cell 10.

[0089] Specifically, in the embodiments of this application, the substrate layer 131 of the insulating member 13 is bonded to the Mylar film 14, and the Mylar film 14 is bonded to the inner surface of the housing 12. The heat of the electrode assembly 11 can be transferred to the housing 12 through the insulating member 13 and the Mylar film 14, thereby dissipating heat through the housing 12 and improving the heat dissipation efficiency of the battery cell 10.

[0090] It should be added that, in addition to accelerating the heat transfer efficiency between the electrode assembly 11 and the housing 12, the insulating component 13 here can also make the temperature of the first surface 111 of the electrode assembly 11 more uniform and reduce the situation of excessively high local temperature of the first surface 111 of the electrode assembly 11.

[0091] In some embodiments of this application, such as Figure 5 As shown, the thermally conductive layer 132 includes a graphite coating 1321, the entire orthographic projection of the graphite coating 1321 toward the substrate layer 131 is located on the substrate layer 131, and the entire orthographic projection of the graphite coating 1321 toward the adhesive layer 133 is located on the adhesive layer 133.

[0092] The graphite coating 1321 here can also be replaced by other coatings with thermal conductivity, such as nanomaterial coatings, epoxy composite coatings, etc. These coatings not only have thermal conductivity, but also need to have the characteristics of being resistant to electrolyte corrosion.

[0093] Continue to refer to Figure 5 As shown, the graphite coating 1321, the substrate layer 131, and the adhesive layer 133 are all rectangular structures. The size and shape of the graphite coating 1321 can be exactly the same as those of the substrate layer 131, and the size and shape of the graphite coating 1321 can also be exactly the same as those of the adhesive layer 133. In this case, the outlines of the graphite coating 1321, the substrate layer 131, and the adhesive layer 133 are set to coincide.

[0094] In the embodiments of this application, by including a graphite coating 1321 in the thermally conductive layer 132, with the entire orthographic projection of the graphite coating 1321 toward the substrate layer 131 located on the substrate layer 131 and the entire orthographic projection of the graphite coating 1321 toward the adhesive layer 133 located on the adhesive layer 133, the substrate layer 131 can completely cover the surface of the graphite coating 1321, and the adhesive layer 133 can completely cover the surface of the graphite coating 1321. Thus, the circumferential edges of the substrate layer 131 and the circumferential edges of the adhesive layer 133 can seal the graphite coating 1321, reducing the probability of the insulating component 13 decarburizing and corroding the housing 12 when immersed in the electrolyte.

[0095] In some embodiments of this application, the circumferential edge of the graphite coating 1321 is located inside the circumferential edge of the substrate layer 131, and / or the circumferential edge of the graphite coating 1321 is located inside the circumferential edge of the adhesive layer 133.

[0096] In this embodiment, the size of the graphite coating 1321 is smaller than the size of the substrate layer 131, and the size of the graphite coating 1321 is smaller than the size of the adhesive layer 133. This allows the circumferential outline of the graphite coating 1321 to be within the coverage area of ​​the substrate layer 131 and the adhesive layer 133 when the graphite coating 1321 is formed between the substrate layer 131 and the adhesive layer 133. This enables the substrate layer 131 and the adhesive layer 133 to form a better encapsulation effect on the graphite coating 1321, reducing the probability of the graphite coating 1321 being corroded by the electrolyte.

[0097] In the embodiments of this application, the circumferential edge of the graphite coating 1321 is located inside the circumferential edge of the substrate layer 131, and / or the circumferential edge of the graphite coating 1321 is located inside the circumferential edge of the adhesive layer 133. This allows the circumferential edges of both the substrate layer 131 and the adhesive layer 133 to be located outside the circumferential edge of the graphite coating 1321. This enables the circumferential edges of the substrate layer 131 and the adhesive layer 133 to provide a better sealing effect on the graphite coating 1321, reducing the probability of decarburization of the insulating component 13 when immersed in the electrolyte, thereby corroding the housing 12.

[0098] In some embodiments of this application, such as Figure 6 As shown, the thermal conductive layer 132 includes a package 1322, and the interior of the package 1322 is provided with graphite.

[0099] In this embodiment, the thermal conductive layer 132 is implemented using a package 1322 made of an encapsulation structure. The package 1322 includes an encapsulation region 13221 and a graphite region 13222. The graphite region 13222 is filled with graphite, and the encapsulation region 13221 is provided on the circumferential edge of the graphite region 13222, thereby achieving a better encapsulation effect on the graphite.

[0100] In the embodiments of this application, by including a package 1322 in the thermal conductive layer 132, and having graphite inside the package 1322, the graphite can be placed inside the package 1322, giving the thermal conductive layer 132 thermal conductivity. This allows the heat from the battery cell 10 to be transferred to the housing 12 as quickly as possible, and also enables the encapsulation of the graphite, reducing the probability of the insulating component 13 decarburizing and corroding the housing 12 when immersed in the electrolyte.

[0101] In some embodiments of this application, the package 1322 includes a polymer material component.

[0102] The polymer material components mentioned here refer to parts made of polymer materials, such as polyethylene terephthalate plastic or polystyrene plastic, which can achieve better sealing performance and better sealing effect on graphite.

[0103] The embodiments of this application include a polymer material component in the encapsulation component 1322. Due to the good sealing performance of the polymer material, the thickness of the encapsulation component 1322 can be reduced, thereby reducing the weight of the encapsulation component 1322, reducing the space occupied inside the housing 12, and reducing the weight of the battery cell 10.

[0104] In some embodiments of this application, such as Figure 4 As shown, the electrode assembly 11 further includes a second surface 112. The first surface 111 is disposed along the height direction of the battery cell 10. The second surface 112 intersects with the first surface 111 and faces the housing 12. An insulating member 13 is disposed in at least a portion of the space between the second surface 112 and the housing 12. Figure 3 In the diagram, the XX direction represents the length of the battery cell 10, the YY direction represents the width of the battery cell 10, and the ZZ direction represents the height of the battery cell 10. The electrode assembly 11, composed of a positive electrode, a negative electrode, and a separator, is the core component of the battery cell 10. The electrode assembly 11 can be a rectangular structure or a cylindrical structure. In the embodiments of this application, the electrode assembly 11 is a rectangular structure, and its first surface 111 is at least one side of the rectangular structure, which can be two, three, or four sides.

[0105] It should be noted that the second surface 112 is the bottom surface of the electrode assembly 11. The second surface 112 and the top cover 113 are arranged parallel to each other at intervals. The fact that an insulating element 13 is provided in at least part of the space between the second surface 112 and the housing 12 means that an insulating element 13 is also provided below the electrode assembly 11.

[0106] The insulating element 13 here and the insulating element 13 located on the side of the electrode assembly 11 can be a separate structure or an integral structure, which can enable the heat of the electrode assembly 11 to be transferred to the housing 12 more quickly.

[0107] In the embodiments of this application, by further including a second surface 112 in the electrode assembly 11, the second surface 112 intersects with the first surface 111 and is disposed facing the housing 12, and an insulating member 13 is provided in at least a portion of the space between the second surface 112 and the housing 12, the insulating member 13 can be provided in at least a portion of the space between the second surface 112 of the electrode assembly 11 and the housing 12, thereby enhancing the heat transfer efficiency between the bottom of the electrode assembly 11 and the housing 12, and thus reducing the temperature of the electrode assembly 11 more quickly.

[0108] In some embodiments of this application, such as Figure 5 and Figure 6As shown, the surface of the thermally conductive layer 132 facing the adhesive layer 133 is provided with an identification code 134, and the adhesive layer 133 is provided with a first through hole 1331 opposite to the identification code 134.

[0109] The identification code 134 can be obtained by spraying, directly forming it onto the heat-conducting layer 132. The identification code 134 can be white or yellow, etc., to make it more prominent on the heat-conducting layer 132. Furthermore, the first through-hole 1331 can be a rectangular hole or a circular hole, etc., allowing the user to easily see the identification code 134 on the heat-conducting layer 132 through the through-hole 1331. Alternatively, during the processing of the identification code 134, the spraying material can pass through the first through-hole 1331 and be sprayed onto the surface of the heat-conducting layer 132.

[0110] In the embodiments of this application, an identification code 134 is provided on the surface of the thermally conductive layer 132 facing the adhesive layer 133, and a first through hole 1331 is provided on the adhesive layer 133 opposite to the identification code 134. This allows users to easily see the identification code 134 on the thermally conductive layer 132 through the first through hole 1331, facilitating the traceability of the battery cell 10.

[0111] Optionally, the identification code 134 is applied to the thermally conductive layer 132 by spraying.

[0112] In the embodiments of this application, the identification code 134 is applied to the heat-conducting layer 132 by spraying. This allows the identification code 134 to be formed on the heat-conducting layer 132 by inkjet printing, which makes the printed content clear, durable, and resistant to wear or fading.

[0113] In some embodiments of this application, such as Figure 4 As shown, the substrate layer 131 has an identification code 134, such as Figure 5 and Figure 6 As shown, the thermally conductive layer 132 is provided with a first clearance hole 1323 opposite to the identification code 134, and the adhesive layer 133 is provided with a first through hole 1331 opposite to the first clearance hole 1323.

[0114] The identification code 134 is located on the substrate layer 131. Correspondingly, the thermal conductive layer 132 is provided with a first clearance hole 1323 opposite to the identification code 134, and the adhesive layer 133 is provided with a first through hole 1331 opposite to the first clearance hole 1323. The processing of the first clearance hole 1323 and the first through hole 1331 can be carried out by die-cutting or by laser cutting.

[0115] Accordingly, the first clearance hole 1323 can be a circular hole or a rectangular hole, and the first through hole 1331 can be a circular hole or a rectangular hole. It is understood that when the thermally conductive layer 132 is a package 1322, the area around the first clearance hole 1323 also needs to be encapsulated to reduce the probability of electrolyte entering the interior of the package 1322 from around the first clearance hole 1323, thereby reducing the probability of the package 1322 being corroded by the electrolyte.

[0116] The embodiments of this application provide an identification code 134 on the substrate layer 131, a first clearance hole 1323 opposite to the identification code 134 on the thermally conductive layer 132, and a first through hole 1331 opposite to the first clearance hole 1323 on the adhesive layer 133. This allows users to easily see the identification code 134 on the substrate layer 131 through the first through hole 1331 and the first clearance hole 1323, facilitating the traceability of the battery cell 10.

[0117] Optionally, the thickness of the thermally conductive layer 132 is greater than or equal to the thickness of the adhesive layer 133.

[0118] The thermally conductive layer 132, adhesive layer 133 and substrate layer 131 are stacked. By making the thickness of the thermally conductive layer 132 greater than or equal to the thickness of the adhesive layer 133, the insulating component 13 can have a thicker thermally conductive layer 132, thereby improving the thermal conductivity of the insulating component 13.

[0119] In the embodiments of this application, by making the thickness of the thermally conductive layer 132 greater than or equal to the thickness of the adhesive layer 133, the insulating component 13 can have a higher thermal conductivity and is easier to manufacture.

[0120] Optionally, the ratio of the thickness of the thermally conductive layer 132 to the thickness of the adhesive layer 133 is between 1 and 2. That is, the ratio of the thickness of the thermally conductive layer 132 to the thickness of the adhesive layer 133 can be 1, 1.2, 1.5, 1.8 or 2, etc. For example, the thickness of the thermally conductive layer 132 is 0.02 mm, and the thickness of the adhesive layer 133 is 0.01 mm or 0.015 mm, etc.

[0121] The embodiments of this application control the ratio of the thickness of the thermally conductive layer 132 to the thickness of the adhesive layer 133 to be between 1 and 2, which enables the insulating component 13 to have high thermal conductivity and is easy to manufacture.

[0122] Optionally, the thickness of the substrate layer 131 is greater than or equal to the sum of the thicknesses of the thermally conductive layer 132 and the adhesive layer 133.

[0123] By making the thickness of the substrate layer 131 greater than or equal to the sum of the thicknesses of the thermally conductive layer 132 and the adhesive layer 133, the thickness of the substrate layer 131 can be increased, thereby improving the mechanical properties of the insulating component 13.

[0124] As one specific implementation, the substrate layer 131 can be made of PET (Polyethylene terephthalate), which has high strength.

[0125] In the embodiments of this application, by making the thickness of the substrate layer 131 greater than or equal to the sum of the thicknesses of the thermally conductive layer 132 and the adhesive layer 133, the insulating component 13 is less prone to mechanical damage that could lead to graphite leakage, thereby improving the safety of the insulating component 13.

[0126] It should be noted that, as Figure 7 As shown, when the battery cell 10 adopts a bottom-cooled structure, the insulating member 13 can be simultaneously disposed below and on the side of the electrode assembly 11, which can significantly reduce the temperature of the electrode assembly 11. When the battery cell 10 adopts a side-cooled structure, the insulating member 13 can be disposed only on the side of the electrode assembly 11. The insulating member 13 wraps around the largest surface of the electrode assembly 11, which can enhance the heat conduction efficiency between the electrode assembly 11 and the housing 12, and significantly reduce the temperature of the electrode assembly 11.

[0127] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0128] A first aspect of the embodiments of this application provides a battery cell 10, including an electrode assembly 11, a housing 12, and an insulating member 13. The electrode assembly 11 includes a first surface 111 facing the housing 12, and the housing 12 includes a receiving cavity 121. The insulating member 13 is disposed in at least a portion of the space between the first surface 111 and the housing 12. The insulating member 13 includes a substrate layer 131, a thermally conductive layer 132, and an adhesive layer 133 stacked sequentially, and the adhesive layer 133 is attached to the electrode assembly 11. Further, the thermally conductive layer 132 includes a graphite coating 1321, the entire orthographic projection of the graphite coating 1321 toward the substrate layer 131 being located on the substrate layer 131, and the entire orthographic projection of the graphite coating 1321 toward the adhesive layer 133 being located on the adhesive layer 133. Further, the circumferential edge of the graphite coating 1321 is located inside the circumferential edge of the substrate layer 131, and / or the circumferential edge of the graphite coating 1321 is located inside the circumferential edge of the adhesive layer 133. Further, the thermally conductive layer 132 includes an encapsulation component 1322, the interior of which is provided with graphite. Further, the encapsulation component 1322 includes a polymer material component. Further, the electrode assembly 11 also includes a second surface 112, the first surface 111 is disposed along the height direction of the battery cell 10, the second surface 112 intersects with the first surface 111, and the second surface 112 faces the housing 12; an insulating component 13 is disposed in at least a portion of the space between the second surface 112 and the housing 12. Further, an identification code 134 is provided on the surface of the thermally conductive layer 132 facing the adhesive layer 133, and a first through-hole 1331 is provided on the adhesive layer 133 opposite to the identification code 134. Optionally, the identification code 134 is applied to the thermally conductive layer 132 by spraying. Further, the identification code 134 is provided on the substrate layer 131, the thermally conductive layer 132 has a first clearance hole 1323 opposite to the identification code 134, and the adhesive layer 133 has a first through hole 1331 opposite to the first clearance hole 1323. Further, the thickness of the thermally conductive layer 132 is greater than or equal to the thickness of the adhesive layer 133. Further, the ratio of the thickness of the thermally conductive layer 132 to the thickness of the adhesive layer 133 is between 1 and 2. Further, the thickness of the substrate layer 131 is greater than or equal to the sum of the thicknesses of the thermally conductive layer 132 and the adhesive layer 133. Further, the battery cell 10 also includes a Mylar film 14, and an insulating member 13 is disposed between the electrode assembly 11 and the Mylar film 14.

[0129] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The housing includes a receiving cavity; An electrode assembly is disposed within the accommodating cavity, the electrode assembly including a first surface facing the housing; as well as An insulating component is provided in at least a portion of the space between the first surface and the housing, wherein the insulating component includes a substrate layer, a thermally conductive layer and an adhesive layer stacked sequentially along its own thickness direction, and the adhesive layer is attached to the electrode assembly.

2. The battery cell as described in claim 1, characterized in that, The thermally conductive layer includes a graphite coating, the entire orthographic projection of the graphite coating toward the substrate layer being located on the substrate layer, and the entire orthographic projection of the graphite coating toward the adhesive layer being located on the adhesive layer.

3. The battery cell as described in claim 2, characterized in that, The circumferential edge of the graphite coating is located inside the circumferential edge of the substrate layer, and / or the circumferential edge of the graphite coating is located inside the circumferential edge of the adhesive layer.

4. The battery cell as described in claim 1, characterized in that, The thermally conductive layer includes an encapsulation component, the interior of which contains graphite.

5. The battery cell as described in claim 4, characterized in that, The encapsulation component includes a polymer material component.

6. The battery cell according to any one of claims 1 to 5, characterized in that, The electrode assembly further includes a second surface, the first surface is disposed along the height direction of the battery cell, the second surface intersects with the first surface and is disposed facing the housing, and the insulating member is disposed in at least a portion of the space between the second surface and the housing.

7. The battery cell according to any one of claims 1 to 5, characterized in that, The thermally conductive layer has an identification code on its surface facing the adhesive layer, and the adhesive layer has a first through hole that is opposite to the identification code.

8. The battery cell as described in claim 7, characterized in that, The identification code is applied to the heat-conducting layer by spraying.

9. The battery cell according to any one of claims 1 to 5, characterized in that, The substrate layer is provided with an identification code, the thermally conductive layer is provided with a first clearance hole opposite to the identification code, and the adhesive layer is provided with a first through hole opposite to the first clearance hole.

10. The battery cell according to any one of claims 1 to 5, characterized in that, The thickness of the thermally conductive layer is greater than or equal to the thickness of the adhesive layer.

11. The battery cell as described in claim 10, characterized in that, The ratio of the thickness of the thermally conductive layer to the thickness of the adhesive layer is between 1 and 2.

12. The battery cell according to any one of claims 1 to 5, characterized in that, The thickness of the substrate layer is greater than or equal to the sum of the thicknesses of the thermally conductive layer and the adhesive layer.

13. The battery cell according to any one of claims 1 to 5, characterized in that, The battery cell also includes a Mylar membrane, and the insulating element is disposed between the electrode assembly and the Mylar membrane.

14. A battery device, characterized in that, It includes at least one battery cell as described in any one of claims 1 to 13.

15. An electrical appliance, characterized in that, Includes the battery device as described in claim 14, the battery device being used to supply power to the electrical equipment.

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