Battery monomer, battery and electric equipment

Abstract

The utility model discloses a battery monomer, a battery and electric equipment. A battery cell includes a housing and an insulator. The insulator covers at least a portion of a surface of the housing. Wherein the insulating part comprises a heat insulation layer and a first adhesive layer, the heat insulation layer is connected to the shell through the first adhesive layer, and the heat insulation layer is made of an insulating material. And the heat insulation layer is connected with the shell through the first adhesive layer, so that the heat resistance and the heat insulation capability of the battery monomers are improved when the adjacent battery monomers are subjected to thermal runaway, and the temperature of the battery monomers is reduced.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the development of battery technology, in addition to improving battery performance, the reliability of batteries during use is also an issue that needs to be considered.

[0004] Therefore, how to improve battery reliability is an urgent problem to be solved in battery technology. Utility Model Content

[0005] In view of the above problems, the embodiments of the present application provide a battery cell, a battery and an electrical device, which can improve the reliability of the battery during use.

[0006] In a first aspect, an embodiment of the present application provides a battery cell, comprising a housing and an insulating member. The insulating member covers at least a portion of the surface of the housing. The insulating member comprises a heat insulating layer and a first adhesive layer, the heat insulating layer is connected to the housing through the first adhesive layer, and the heat insulating layer is made of an insulating material.

[0007] In the technical solution of the embodiment of the present application, the heat insulation layer is made of insulating material to prevent short circuits between battery cell shells, and the heat insulation layer is connected to the shell through the first adhesive layer to improve the heat resistance and insulation capacity of the battery cell when thermal runaway occurs in adjacent battery cells, so as to reduce the temperature of the battery cell, which is beneficial to reducing the probability of heat diffusion between battery cells and improving the reliability of battery cells. At the same time, because the heat insulation layer can play an insulating role, it can limit the short circuit between battery cells when thermal runaway occurs in the battery cell.

[0008] In some embodiments, the melting point of the thermal insulation layer is greater than 200°C.

[0009] In the above technical solution, the melting point of the heat insulation layer is greater than 200°C. This design ensures that when the temperature of the battery cell rises due to thermal runaway, the heat insulation layer will not be melted, so as to play the role of heat insulation and heat isolation, which is beneficial to limit the heat transfer from the battery cell with thermal runaway to the surrounding battery cells, and is beneficial to reduce the temperature of the battery cell where thermal runaway occurs. Thereby reducing the probability of heat diffusion between battery cells.

[0010] In some embodiments, the thermal insulation layer is a ceramic layer.

[0011] In the above technical solution, the thermal insulation layer is a ceramic layer, which, on the one hand, makes the thermal insulation layer have better high temperature resistance, and also can effectively improve the thermal insulation capacity of the thermal insulation layer.

[0012] In some embodiments, the ceramic layer is an alumina ceramic layer.

[0013] In the above technical solution, alumina ceramics have high temperature resistance, insulation and heat insulation capabilities. The ceramic layer made of the above material can improve the high temperature resistance, insulation and heat insulation capabilities of the ceramic layer, thereby improving the heat resistance and heat insulation capabilities of the battery cell, so as to reduce the temperature of the battery cell around the battery cell that has thermal runaway. At the same time, the above material also has the advantages of abundant sources and easy access.

[0014] In some embodiments, the thickness of the heat insulation layer is H1, satisfying 25 μm≤H1≤50 μm.

[0015] In the above technical solution, the thickness of the heat insulation layer is reasonable. When the above heat insulation layer is applied to the battery cell, when the battery cell has thermal runaway, it can not only improve the heat resistance and heat insulation capacity of the battery cell, so as to reduce the temperature of the battery cell around the battery cell having thermal runaway, but also reduce the influence of the insulating part on the volume of the battery cell, reduce the space occupied by the battery cell, and help to improve the energy density of the battery.

[0016] In some embodiments, the thickness of the first adhesive layer is H2, satisfying 15 μm≤H2≤20 μm.

[0017] In the above technical solution, the thickness of the first adhesive layer is reasonable. When the above first adhesive layer is applied to the battery cell, the heat insulation layer can be stably connected to the shell through the first adhesive layer. At the same time, the influence of the insulating member on the volume of the battery cell is reduced, the space occupied by the battery cell is reduced, and the energy density of the battery is improved.

[0018] In some embodiments, the insulating member further comprises an insulating layer. The insulating layer is arranged on a side of the heat insulating layer away from the shell, and the melting point of the insulating layer is lower than that of the heat insulating layer.

[0019] In the above technical solution, the insulating layer is arranged on the side of the thermal insulation layer away from the outer shell. On the one hand, the insulating performance of the insulating member is improved. On the other hand, since the melting point of the insulating layer is lower than that of the thermal insulation layer, the material requirements of the insulating layer are less than those of the thermal insulation layer. Therefore, its manufacturing cost can be lower than that of the thermal insulation layer. This is beneficial to reducing the manufacturing cost of the insulating member and the battery cell using the insulating member.

[0020] In some embodiments, the insulating layer is a thermoplastic layer.

[0021] In the above technical solution, the insulating layer is a thermoplastic plastic layer, which on one hand makes the insulating layer have better insulation performance, and on the other hand makes the insulating layer have better toughness, so that the insulating layer is not easy to break when the insulating part is bent.

[0022] In some embodiments, the thermoplastic layer is a polyethylene terephthalate layer, a polypropylene layer, a polystyrene layer, or a polyvinyl chloride layer.

[0023] In the above technical solution, polyethylene terephthalate, polypropylene, polystyrene layer or polyvinyl chloride all have insulation ability and high toughness. The insulation layer made of the above materials can improve the insulation ability and toughness of the ceramic layer. At the same time, the above materials also have the advantages of abundant sources and easy acquisition.

[0024] In some embodiments, the thickness of the insulating layer is H3, satisfying 20 μm≤H3≤30 μm.

[0025] In the above technical solution, the thickness of the insulating layer is reasonable. When the above insulating layer is applied to the battery cell, when the battery cell works normally, it can not only improve the insulation of the battery cell, but also reduce the influence of the insulating part on the volume of the battery cell, reduce the space occupied by the battery cell, and is beneficial to improve the energy density of the battery.

[0026] In some embodiments, the insulating member further comprises a second adhesive layer. The second adhesive layer is sandwiched between the heat-insulating layer and the insulating layer, and the insulating layer is connected to the heat-insulating layer through the second adhesive layer.

[0027] In the above technical solution, the second adhesive layer is used to connect the insulating layer with the heat-insulating layer, so as to reduce the probability of the insulating layer detaching from the heat-insulating layer during the operation of the battery cell.

[0028] In some embodiments, the thickness of the second adhesive layer is H4, satisfying 15 μm≤H4≤20 μm.

[0029] In the above technical solution, the thickness of the second adhesive layer is reasonable. When the second adhesive layer is applied to the battery cell, the insulating layer can be stably connected to the heat insulation layer through the second adhesive layer. At the same time, the influence of the insulating component on the volume of the battery cell is reduced, the space occupied by the battery cell is reduced, and the energy density of the battery is improved.

[0030] In a second aspect, an embodiment of the present application provides a battery, comprising the battery cell provided in the embodiment of the first aspect.

[0031] The above technical solution includes a battery provided with the battery cell provided by the first embodiment. When the battery cell undergoes thermal runaway, the heat resistance and heat insulation capability of the battery cell can be improved to reduce the temperature of the battery cell. At the same time, since the heat insulation layer can play an insulating role, the short circuit between the battery cells can be limited when the battery cell undergoes thermal runaway. This is beneficial to improving the reliability of the battery.

[0032] In a third aspect, an embodiment of the present application provides an electrical device, comprising the battery provided in the embodiment of the second aspect.

[0033] The above technical solution includes an electrical device equipped with a battery provided by the battery cell of the first embodiment. When the battery cell undergoes thermal runaway, the heat resistance and heat insulation capability of the battery cell can be improved to reduce the temperature of the battery cell. At the same time, since the heat insulation layer can play an insulating role, the short circuit between the battery cells can be limited when the battery cell undergoes thermal runaway. This is beneficial to improving the reliability of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0036] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0037] Figure 3 An exploded view of a battery cell provided for some embodiments of the present application;

[0038] Figure 4 A schematic structural diagram of an insulating member provided in some embodiments of the present application;

[0039] Figure 5 A schematic structural diagram of another insulating component provided for some embodiments of the present application.

[0040] The reference numerals in the specific implementation manner are as follows:

[0041] 1000 – vehicles;

[0042] 100 - battery; 200 - controller; 300 - motor;

[0043] 10 - box body; 11 - first part; 12 - second part;

[0044] 20 - battery cell; 21 - shell; 211 - shell; 211A - opening; 212 - cover plate; 22 - electrode assembly; 23 - insulating member; 23A - avoidance portion; 231 - heat insulation layer; 232 - first adhesive layer; 233 - insulating layer; 234 - second adhesive layer. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0047] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0048] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0050] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0051] The term "plurality" used in the present application refers to two or more (including two).

[0052] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0053] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0054] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0055] In order to reduce the risk of internal short circuit in the battery, a blue film is provided on the surface of the battery cell, and the blue film is coated on the outer surface of the outer shell of the battery cell to prevent the outer shells of adjacent battery cells from contacting or the shell of the battery cell from contacting the box body and causing a short circuit.

[0056] When short circuit, overcharge and other phenomena occur, thermal runaway may occur in the battery cell, resulting in a sudden rise in temperature. The temperature rise of the battery cell may cause the blue film to melt. As a result, insulation failure occurs between adjacent battery cells and between the battery cell and the box, increasing the risk of battery short circuit. At the same time, the temperature around the battery cell that has thermal runaway will also rise, which will cause the temperature of the surrounding battery cells to rise, resulting in heat diffusion between the battery cells.

[0057] In view of this, an embodiment of the present application provides a battery cell, including a shell and an insulating member. The insulating member covers at least a portion of the surface of the shell. Among them, the insulating member includes a thermal insulation layer and a first adhesive layer. The thermal insulation layer is an insulating material to prevent short circuits between the battery cell shells. The thermal insulation layer is connected to the shell through the first adhesive layer to improve the heat resistance and heat insulation capabilities of the battery cell when thermal runaway occurs in adjacent battery cells, so as to reduce the temperature of the battery cell, which is beneficial to reducing the probability of heat diffusion between battery cells and improving the reliability of the battery cell. At the same time, because the thermal insulation layer can play an insulating role, it can limit the short circuit between the battery cells when thermal runaway occurs in the battery cell.

[0058] The embodiments of the present application provide an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0059] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0060] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0061] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0062] According to some embodiments of the present application, referring to Figure 2 , Figure 2An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 may include a housing 10 and a battery cell 20, and the battery cell 20 is contained in the housing 10. The housing 10 is used to provide a housing cavity for the battery cell 20, and the housing 10 may adopt a variety of structures. In some embodiments, the housing 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a housing cavity for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a housing cavity; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the connection between the first part 11 and the second part 12 can be sealed by a seal (not shown in the figure), and the seal may be a sealing ring, a sealant, etc.

[0063] Of course, the box body 10 formed by the first part 11 and the second part 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0064] Optionally, the first part 11 and the second part 12 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the box body 10 is not easily deformed when squeezed or collided, so that the battery cell 20 can have a higher structural strength, which is beneficial to reducing the degree of damage to the battery 100 caused by external force collision.

[0065] In the battery 100, the battery cell 20 can be one or more. If there are more than one battery cell 20, the battery cells 20 can be connected in series, in parallel or in a mixed connection. A mixed connection means that the battery cells 20 are connected in series and in parallel. The battery cells 20 can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by the battery cells 20 can be accommodated in the box 10; of course, the battery cells 20 can be connected in series, in parallel or in a mixed connection to form a battery module, and then the battery modules can be connected in series, in parallel or in a mixed connection to form a whole, and then accommodated in the box 10. The battery cell 20 can be cylindrical, flat, rectangular or in other shapes. Figure 2 The example shows that the battery cell 20 is a rectangular parallelepiped.

[0066] According to some embodiments of the present application, referring to Figure 3 , and please refer to Figure 4 , Figure 3 An exploded view of a battery cell 20 provided in some embodiments of the present application, Figure 4A schematic diagram of the structure of an insulating member 23 provided in some embodiments of the present application. A battery cell 20 includes a shell 21 and an insulating member 23. The insulating member 23 covers at least a portion of the surface of the shell 21. The insulating member 23 includes a heat insulating layer 231 and a first adhesive layer 232, the heat insulating layer 231 is connected to the shell 21 through the first adhesive layer 232, and the heat insulating layer 231 is made of an insulating material.

[0067] It can be understood that the battery cell 20 generally includes an electrode assembly 22, which includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 20, active ions (such as lithium ions) are inserted and removed between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to reduce the risk of short circuit between the positive and negative electrodes, while allowing active ions to pass through.

[0068] The battery cell 20 also includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be in a liquid, gel or solid state.

[0069] The housing 21 is used to encapsulate the electrode assembly 22 and electrolyte components. The housing 21 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.

[0070] Optionally, the outer shell 21 may be in various shapes. The shape of the outer shell 21 may be determined according to the specific shape of the electrode assembly 22 . Figure 3 The case where the housing 21 and the electrode assembly 22 are rectangular parallelepiped is exemplarily shown.

[0071] like Figure 4 As shown, the housing 21 may include a shell 211 and a cover plate 212. The shell 211 may be provided with an opening 211A communicating with the interior of the shell 211. The cover plate 212 is a component that covers the opening 211A of the shell 211 to isolate the internal environment of the battery cell 20 from the external environment. For example, the cover plate 212 covers the opening 211A of the shell 211 to define a sealed space for accommodating the electrode assembly 22, electrolyte and other components together with the shell 211. The insulating member 23 covers at least a portion of the outer surface of the shell 211.

[0072] The insulating member 23 covering at least part of the outer surface of the shell 211 may refer to the insulating member 23 covering part or all of the outer surface of the shell 211. In the embodiment where the insulating member 23 completely covers the surface of the shell 211, the insulating member 23 may be provided with an avoidance portion 23A to facilitate the coating of an adhesive for connecting the shell 211 with the shell 211, or to facilitate the coating of an adhesive for connecting the outer shell 211 with the box (not shown in the figure) on the shell 211, so as to facilitate the assembly of the battery cell 20 into a battery (not shown in the figure). In the embodiment where the insulating member 23 does not completely cover the surface of the shell 211, the adhesive for connecting the shell 211 with the shell 211, or to facilitate the coating of an adhesive for connecting the shell 211 with the box (not shown in the figure) on the shell 211 may be directly coated on the part of the shell 211 not covered by the insulating member 23.

[0073] It can be understood that the insulating member 23 may also cover at least a portion of the surface of the cover plate 212 facing away from the housing 211 .

[0074] The first adhesive layer 232 is a portion of the insulating member 23 used to connect the housing 21 and the heat insulating layer 231. The first adhesive layer 232 may be made of an adhesive, and illustratively, the first adhesive layer 232 may be made of a pressure-sensitive adhesive.

[0075] The heat insulating layer 231 is connected to the surface of the outer shell 21 through the first adhesive layer 232 , so that the heat insulating layer 231 can cover a part of the surface or the entire surface of the outer shell 21 .

[0076] The heat insulating layer 231 is made of insulating material to limit short circuits between battery cells 20, and the heat insulating layer 231 is connected to the housing 21 through the first adhesive layer 232 to reduce the temperature of the battery cells 20 around the battery cell 20 that has thermal runaway when the adjacent battery cells 20 have thermal runaway. At the same time, since the heat insulating layer 231 can play an insulating role, the short circuit between the battery cells 20 is limited when the battery cells 20 have thermal runaway.

[0077] According to some embodiments of the present application, the melting point of the thermal insulation layer 231 is greater than 200°C.

[0078] The heat insulating layer 231 is made of insulating materials that are resistant to high temperatures and have good heat insulation performance. The heat insulating layer 231 can be made of one or more of ceramics and high-performance polymer materials.

[0079] It is understandable that in the embodiment where the heat insulating layer 231 is made of a high-performance polymer material, the heat insulating layer 231 can be made of polyimide. Polyimide has high temperature resistance, insulation and heat insulation capabilities. The heat insulating layer 231 made of the above material can improve the high temperature resistance, insulation and heat insulation capabilities of the heat insulating layer 231, thereby improving the heat resistance and heat insulation capabilities of the battery cell 20, so as to reduce the temperature of the battery cell 20 that has thermal runaway on the surrounding battery cells 20.

[0080] Such a design ensures that when the temperature of the battery cell 20 rises due to thermal runaway, the thermal insulation layer 231 will not be melted, thereby playing the role of thermal insulation and heat isolation, thereby reducing the impact of the battery cell 20 with thermal runaway on the surrounding battery cells 20.

[0081] According to some embodiments of the present application, the thermal insulation layer 231 is a ceramic layer.

[0082] Ceramics are a widely used class of inorganic non-metallic materials, usually composed of metal oxides, nitrides, carbides, etc.

[0083] The heat insulating layer 231 is a ceramic layer, which not only makes the heat insulating layer 231 more resistant to high temperatures, but also effectively improves the heat insulating capacity of the heat insulating layer 231 .

[0084] According to some embodiments of the present application, the ceramic layer is an aluminum oxide ceramic layer.

[0085] Alumina ceramic is a common ceramic material, also known as alumina ceramic material or alumina ceramic. It is a ceramic material composed of aluminum oxide, which has the characteristics of high hardness, high temperature resistance, insulation and chemical stability.

[0086] Alumina ceramics have high temperature resistance, insulation and heat insulation capabilities. The ceramic layer made of the above material can improve the high temperature resistance, insulation and heat insulation capabilities of the ceramic layer, thereby improving the heat resistance and heat insulation capabilities of the battery cell 20, so as to reduce the impact of the battery cell 20 that has thermal runaway on the surrounding battery cells 20. At the same time, the above alumina ceramics also have the advantages of abundant sources and easy access.

[0087] According to some embodiments of the present application, referring to Figure 3 , and continue to refer to Figure 4 , the thickness of the heat insulation layer 231 is H1, satisfying 25μm≤H1≤50μm.

[0088] Exemplarily, the thickness of the heat insulation layer 231 may be any value of 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, or between any two values.

[0089] The thickness of the thermal insulation layer 231 is reasonable. When the thermal insulation layer 231 is applied to the battery cell 20, when the battery cell 20 has thermal runaway, it can not only improve the heat resistance and insulation capacity of the battery cell 20, but also reduce the temperature of the battery cell 20 around the battery cell 20 having thermal runaway. It also reduces the influence of the insulating member 23 on the volume of the battery cell 20, reduces the space occupied by the battery cell 20, and is conducive to improving the energy density of the battery (not shown in the figure). At the same time, it reduces the use of alumina ceramics, thereby reducing the manufacturing cost of the battery cell 20.

[0090] According to some embodiments of the present application, referring to Figure 3 , and continue to refer to Figure 4 , the thickness of the first adhesive layer 232 is H2, satisfying 15 μm≤H2≤20 μm.

[0091] For example, the thickness of the first glue layer 232 may be any value of 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, and 20 μm, or may be between any two values.

[0092] The thickness of the first adhesive layer 232 is reasonable. When the first adhesive layer 232 is used in the battery cell 20, the heat insulating layer 231 can be stably connected to the housing 21 through the first adhesive layer 232. At the same time, the effect of the insulating member 23 on the volume of the battery cell 20 is reduced, and the space occupied by the battery cell 20 is reduced, which is conducive to improving the energy density of the battery (not shown in the figure).

[0093] According to some embodiments of the present application, referring to Figure 3 , and refer to Figure 5 , Figure 5 This is a schematic diagram of another insulating member 23 provided in some embodiments of the present application. The insulating member 23 further includes an insulating layer 233. The insulating layer 233 is disposed on a side of the heat insulating layer 231 away from the housing 21, and the melting point of the insulating layer 233 is lower than that of the heat insulating layer 231.

[0094] The insulating layer 233 is a portion of the insulating member 23 that covers the surface of the heat insulating layer 231 away from the housing 21 .

[0095] It can be understood that since the melting point of the insulating layer 233 is lower than that of the thermal insulation layer 231, the requirements for the heat resistance of the insulating layer 233 material are reduced, so the manufacturing cost of the insulating layer 233 can be lower than that of the thermal insulation layer 231, which is beneficial to reducing the manufacturing cost of the insulating part 23 and the battery cell 20 using the insulating part 23.

[0096] The insulating layer 233 is disposed on a side of the heat-insulating layer 231 facing away from the housing 21 , thereby improving the insulating performance of the insulating member 23 .

[0097] According to some embodiments of the present application, the insulating layer 233 is a thermoplastic plastic layer.

[0098] Thermoplastics are a class of plastic materials that have thermoplastic properties. Thermoplastics can soften and melt when heated and retain their shape and properties after cooling. This type of plastic can be molded and processed multiple times through a cycle of heating and cooling.

[0099] The insulating layer 233 is a thermoplastic plastic layer, which not only makes the insulating layer 233 have better insulation performance, but also makes the insulating layer 233 have better toughness, so that when the insulating member 23 is bent, the insulating layer 233 is not easy to be broken.

[0100] According to some embodiments of the present application, the thermoplastic plastic layer is a polyethylene terephthalate layer, a polypropylene layer, a polystyrene layer or a polyvinyl chloride layer.

[0101] Optionally, the insulating layer 233 may be made of one or more of polyethylene terephthalate, polypropylene, polystyrene and polyvinyl chloride.

[0102] Polyethylene terephthalate, polypropylene, polystyrene or polyvinyl chloride all have insulation capability and high toughness. The insulation layer 233 made of the above materials can improve the insulation capability and toughness of the insulation layer 233. At the same time, the above materials also have the advantages of abundant sources and easy acquisition.

[0103] According to some embodiments of the present application, referring to Figure 3 , and continue to refer to Figure 5 , the thickness of the insulating layer 233 is H3, satisfying 20μm≤H3≤30μm.

[0104] Illustratively, the thickness of the insulating layer 233 may be any value of 20 μm, 22 μm, 23 μm, 26 μm, 28 μm, 30 μm, or between any two values.

[0105] The thickness of the above-mentioned insulating layer 233 is reasonable. When the above-mentioned insulating layer 233 is used in the battery cell 20, when the battery cell 20 works normally, it can not only improve the insulation of the battery cell 20, but also reduce the influence of the insulating part 23 on the volume of the battery cell 20, reduce the space occupied by the battery cell 20, and is beneficial to improve the energy density of the battery (not shown in the figure).

[0106] According to some embodiments of the present application, referring to Figure 3 , and continue to refer to Figure 5 The insulating member 23 further includes a second adhesive layer 234 . The second adhesive layer 234 is sandwiched between the heat insulating layer 231 and the insulating layer 233 , and the insulating layer 233 is connected to the heat insulating layer 231 through the second adhesive layer 234 .

[0107] The second adhesive layer 234 is a portion of the insulating member 23 used to connect the insulating layer 233 and the heat insulating layer 231. The second adhesive layer 234 may be made of an adhesive, and illustratively, the second adhesive layer 234 may be made of a pressure-sensitive adhesive.

[0108] The second adhesive layer 234 is bonded to the insulating layer 233 on the side facing the insulating layer 233, and the second adhesive layer 234 is bonded to the insulating layer 231 on the side facing the thermal insulation layer 231, so that the insulating layer 233 is connected to the surface of the thermal insulation layer 231 through the second adhesive layer 234, thereby allowing the insulating member 23 layer to cover part of or all of the surface of the thermal insulation layer 231.

[0109] The second adhesive layer 234 is used to connect the insulating layer 233 to the heat-insulating layer 231 , so as to reduce the probability of the insulating layer 233 being separated from the heat-insulating layer 231 during the operation of the battery cell 20 .

[0110] According to some embodiments of the present application, referring to Figure 3 , and continue to refer to Figure 5 , the thickness of the second adhesive layer 234 is H4, satisfying 15μm≤H4≤20μm.

[0111] The thickness of the second adhesive layer 234 is reasonable. When the second adhesive layer 234 is used in the battery cell 20, the insulating layer 233 can be stably connected to the heat insulation layer 231 through the second adhesive layer 234. At the same time, the influence of the insulating member 23 on the volume of the battery cell 20 is reduced, and the space occupied by the battery cell 20 is reduced, which is conducive to improving the energy density of the battery (not shown in the figure).

[0112] According to some embodiments of the present application, referring to Figure 3 , and continue to refer to Figure 5 The present application provides a battery cell 20 including a shell 21 and an insulating member 23. The insulating member 23 covers at least part of the surface of the shell 21. The thickness H of the insulating member 23 satisfies 100μm≤H≤120μm. The insulating member 23 includes a heat insulating layer 231, a first adhesive layer 232, an insulating layer 233 and a second adhesive layer 234. The heat insulating layer 231 is connected to the surface of the shell 21 through the first adhesive layer 232, and the heat insulating layer 231 is an alumina ceramic layer with a melting point greater than 200°C. The insulating layer 233 is connected to the heat insulating layer 231 through the second adhesive layer 234. The insulating layer 233 is a polyethylene terephthalate layer. The thickness of the heat insulating layer 231 is H1, which satisfies 25μm≤H1≤50μm. The thickness of the first adhesive layer 232 is H2, which satisfies 15μm≤H2≤20μm. The thickness of the insulating layer 233 is H3, which satisfies 20 μm≤H3≤30 μm. The thickness of the second adhesive layer 234 is H4, which satisfies 15 μm≤H4≤20 μm.

[0113] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0114] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: shell; an insulating member, covering at least a portion of a surface of the housing; Wherein, the insulating component includes a heat insulating layer and a first adhesive layer, the heat insulating layer is connected to the outer shell through the first adhesive layer, and the heat insulating layer is made of insulating material.

2. The battery cell according to claim 1, characterized in that: The melting point of the thermal insulation layer is greater than 200°C.

3. The battery cell according to claim 1, characterized in that: The heat insulation layer is a ceramic layer.

4. The battery cell according to claim 3, characterized in that: The ceramic layer is an aluminum oxide ceramic layer.

5. The battery cell according to claim 1, characterized in that: The thickness of the heat insulation layer is H1, which satisfies 25 μm≤H1≤50 μm.

6. The battery cell according to claim 1, characterized in that: The thickness of the first adhesive layer is H2, which satisfies 15 μm≤H2≤20 μm.

7. The battery cell according to claim 1, characterized in that: The insulating member further comprises: The insulating layer is arranged on a side of the heat-insulating layer away from the shell, and the melting point of the insulating layer is lower than that of the heat-insulating layer.

8. The battery cell according to claim 7, characterized in that: The insulating layer is a thermoplastic plastic layer.

9. The battery cell according to claim 8, characterized in that: The thermoplastic plastic layer is a polyethylene terephthalate layer, a polypropylene layer, a polystyrene layer or a polyvinyl chloride layer.

10. The battery cell according to claim 7, characterized in that: The thickness of the insulating layer is H3, satisfying 20 μm≤H3≤30 μm.

11. The battery cell according to claim 7, characterized in that: The insulating member further comprises: A second adhesive layer, wherein the second adhesive layer is sandwiched between the heat-insulating layer and the insulating layer, and the insulating layer is connected to the heat-insulating layer through the second adhesive layer.

12. The battery cell according to claim 11, characterized in that: The thickness of the second adhesive layer is H4, satisfying 15 μm≤H4≤20 μm.

13. A battery, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 12.

14. An electrical device, characterized in that: Comprising a battery as claimed in claim 13, the battery is used to provide electrical energy.

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