Battery cell, battery device, and electric device

Abstract

A battery cell (7), a battery device (2), and an electric device. The battery cell (7) comprises an electrode assembly (30), a casing (20), an insulating coating (50), and an insulating film (40); the electrode assembly (30) is accommodated in the casing (20); a recess (201) is formed in the outer side of the casing (20); the insulating coating (50) is applied onto the outer surface of the casing (20), and at least part of the insulating coating (50) is accommodated in the recess (201); and the insulating film (40) is applied to the outer surface of the casing (20) and covers at least part of the recess (201). In the described structure, since the outer surface of the casing (20) is coated with the insulating coating (50) and at least part of the insulating coating (50) is accommodated in the recess (201), air in the recess (201) is not likely to come into direct contact with the casing (20), thereby improving the electric field distribution of the air in the recess (201), and reducing the risk of air breakdown in the recess (201).

Description

Battery cell, battery device and electric device TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery cell, a battery device and an electric device. BACKGROUND

[0002] The battery has the advantages of high specific energy and high power density, and is widely used in electronic devices and vehicles, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships and electric tools.

[0003] With the increasing use of batteries in people's life, how to improve the reliability of the battery is more and more concerned by the skilled in the art.

[0004] SUMMARY

[0005] In view of the above problems, the present application provides a battery cell, a battery and an electric device, which has good reliability.

[0006] In a first aspect, some embodiments of the present application provide a battery cell, which comprises an electrode assembly, a shell, an insulating coating and an insulating film, the electrode assembly is contained in the shell, the outer side of the shell is provided with a recess; the insulating coating is coated on the outer surface of the shell, and at least part of the insulating coating is contained in the recess; the insulating film is wrapped on the outer surface of the shell, and the insulating film covers at least part of the recess.

[0007] In the above structure, since the outer surface of the shell is coated with the insulating coating and at least part of the insulating coating is contained in the recess, the air in the recess is not easy to directly contact with the shell, the electric field distribution of the air in the recess is improved, the risk of the air in the recess being broken down is reduced, the insulation performance of the outer surface of the battery cell with the recess is improved, and the reliability of the battery cell is improved.

[0008] According to the battery cell provided by some embodiments of the present application, the shell comprises a first shell wall, and the recess is arranged on the first shell wall; in the thickness direction of the first shell wall, the projection of the recess falls within the projection range of the insulating coating. By making the projection of the recess in the thickness direction of the first shell wall fall within the projection range of the insulating coating in the thickness direction of the first shell wall, the insulating coating is arranged on the inner wall surface of the entire recess, so that the inner wall surface of the entire recess will not directly contact with the air in the recess, the possibility of the air in the recess being broken down is reduced, and the insulation performance of the outer surface of the battery cell with the recess is improved.

[0009] According to the battery cell provided by some embodiments of the present application, the first shell wall comprises a first surface, the recess is recessed relative to the first surface, and the partial insulation coating is coated on the first surface beyond the recess, so that the connection between the first surface and the inner wall surface of the recess is coated with the insulation coating, which further reduces the possibility of air breakdown in the recess and helps to improve the insulation performance of the first surface of the battery cell.

[0010] According to the battery cell provided by some embodiments of the present application, the included angle between the side wall surface of the recess and the outer surface of the first shell wall is A, and 60°≤A<90°, which can increase the corner of the air in the recess, not only can improve the electric field distribution in the air, help to reduce the electric field peak value at the corner, reduce the risk of local breakdown in the air, but also make the corner of the air in the recess not too large, which helps to reduce the processing difficulty of the recess.

[0011] According to the battery cell provided by some embodiments of the present application, 75°≤A<90°, which can increase the corner of the air in the recess, not only can improve the electric field distribution in the air, help to reduce the electric field peak value at the corner, reduce the risk of local breakdown in the air, but also make the corner of the air in the recess not too large, which helps to reduce the processing difficulty of the recess.

[0012] According to the battery cell provided by some embodiments of the present application, the side wall surface of the recess comprises a main surface and a transition surface, and the transition surface is connected between the main surface and the outer surface of the first shell wall, which can play a transition role between the main surface and the outer surface of the first shell wall, so that the main surface and the outer surface of the first shell wall can be well transitioned.

[0013] According to the battery cell provided by some embodiments of the present application, at least part of the transition surface is configured as an arc surface. By configuring at least part of the transition surface as an arc surface, the transition surface can be connected between the main surface and the outer surface of the first shell wall more smoothly, which helps to reduce the possibility of sharp corners at the corner and helps to reduce the possibility of electric field concentration.

[0014] According to the battery cell provided by some embodiments of the present application, at least part of the transition surface is configured as a plane, so that the transition surface can be connected between the main surface and the outer surface of the first shell wall more gently, which helps to make the corner more gentle and helps to reduce the possibility of electric field concentration.

[0015] According to the battery cell provided by some embodiments of the present application, the radius of the arc surface is R, and 20μm≤R≤100μm, which not only makes the arc surface have a large enough radius to make the arc surface realize the gentle transition between the main surface and the outer surface of the first shell wall, helps to reduce the possibility of electric field concentration of the air at the corner, but also makes the arc surface not easy to affect the structure of the recess due to having too large a radius.

[0016] According to the battery cell provided by some embodiments of the present application, 40 μm≤R≤80 μm, not only makes the arc surface have a large enough radius to enable the arc surface to realize a smooth transition between the main surface and the outer surface of the first shell wall, and is conducive to reducing the possibility of air at the corner being concentrated by an electric field, but also makes the arc surface not easily affect the structure of the recess due to having a too large radius.

[0017] According to the battery cell provided by some embodiments of the present application, the dielectric strength of the insulating coating is P, and P≥400 kV / mm, so that the insulating coating has good insulation performance and is not easily broken down, so that the shell is not easily discharged and the air in the recess is not easily broken down under the isolation of the insulating coating.

[0018] According to the battery cell provided by some embodiments of the present application, the insulating coating comprises at least one of a polyimide coating, an ultraviolet curing coating and an epoxy coating.

[0019] According to the battery cell provided by some embodiments of the present application, the insulating coating is made by an electrophoretic process, a spraying process or a printing process, not only enables the insulating coating to be firmly formed on the outer surface of the shell and not easily fall off, which is conducive to improving the durability of the insulating coating, but also enables the insulating coating to be conveniently formed on the inner wall surface of the recess.

[0020] According to the battery cell provided by some embodiments of the present application, the thickness of the insulating coating is set as H1, the thickness of the insulating film is set as H2, and 1 / 4≤H1 / H2≤3 / 4, not only enables the insulating coating coated on the outer surface of the shell to have a sufficient thickness to insulate the outer surface of the shell together with the insulating film, but also does not easily cause waste of the material of the insulating coating.

[0021] According to the battery cell provided by some embodiments of the present application, the thickness of the insulating coating is set as H1, and 30 μm≤H1≤90 μm, not only enables the insulating coating to have a sufficient thickness to realize insulation and isolation of the shell and the air in the recess, but also enables the thickness of the insulating coating to not be too large to cause waste of the material.

[0022] According to the battery cell provided by some embodiments of the present application, 60 μm≤H1≤90 μm, not only enables the insulating coating to have a sufficient thickness to realize insulation and isolation of the shell and the air in the recess, but also enables the thickness of the insulating coating to not be too large to cause waste of the material.

[0023] According to the battery cell provided by some embodiments of the present application, the insulating film comprises a first film layer and a second film layer which are stacked, and the first film layer and the second film layer are both polyethylene terephthalate film layers, not only enables the insulating film to have a large dielectric strength, but also have excellent mechanical strength and oil resistance, cold resistance and heat resistance.

[0024] According to the battery cell provided by some embodiments of the present application, the thickness of the insulation film is set as H2, 100 μm≤H2≤200 μm, so that the insulation film has sufficient thickness to have good insulation performance, and the insulation film is not prone to cause material waste due to over-thickness.

[0025] According to the battery cell provided by some embodiments of the present application, the interlayer peeling strength of the insulation film and the shell is B, B≥400 N / m, so that the insulation film is firmly bonded to the outer surface of the shell, and the insulation film is not prone to fall off from the shell.

[0026] According to the battery cell provided by some embodiments of the present application, the insulation film comprises a structural layer and an adhesive layer which are stacked, and the structural layer is bonded to the outer surface of the shell through the adhesive layer, so that the structural layer can be firmly connected to the outer surface of the shell, thereby enabling the insulation film to insulate and isolate the shell from the outside.

[0027] According to the battery cell provided by some embodiments of the present application, the adhesive layer comprises pressure-sensitive adhesive, so that the insulation film can be easily peeled off from the shell, and the shell is not prone to be contaminated, so that the insulation film of the battery cell can be conveniently replaced.

[0028] According to the battery cell provided by some embodiments of the present application, the shell is a metal structure. By setting the shell as a metal structure, the shell has good structural strength, and can well protect the internal components.

[0029] According to the battery cell provided by some embodiments of the present application, the shell comprises a first part and a second part which are connected to each other, and the recess is arranged in the first part to make the thickness of at least part of the first part smaller than the thickness of the second part, so that the structural strength of the first part is smaller than the structural strength of the second part, so that when the pressure in the shell reaches a preset value, the recess of the first part will be broken, and the pressure in the shell will be released from the broken part, so that the recess can play a pressure relief role.

[0030] In the second aspect, some embodiments of the present application provide a power consumption device, which comprises a heat exchange member and the battery cell provided by any of the technical solutions, the heat exchange member exchanges heat with the battery cell, and the recess of the battery cell is arranged on the side of the shell facing the heat exchange member.

[0031] According to the battery device provided by some embodiments of the present application, the insulating coating is arranged on the outer surface perpendicular to the surface facing the heat exchange element, and the size of the insulating coating extending on the outer surface perpendicular to the surface facing the heat exchange element in the direction away from the heat exchange element is G, 10mm≤G≤30mm. The height of the insulating coating on the outer surface perpendicular to the surface facing the heat exchange element is sufficient to increase the creepage distance between the shell and the heat exchange element, and reduce the possibility of short circuit between the shell and the heat exchange element. In addition, the height of the insulating coating on the outer surface perpendicular to the surface facing the heat exchange element is not prone to cause material waste due to being too large.

[0032] In a third aspect, some embodiments of the present application provide a power utilization device, which comprises the battery device provided by any of the technical solutions described above, and the battery device is used to provide electric energy.

[0033] The technical solutions provided by the embodiments of the present application at least have the following beneficial effects:

[0034] The present application provides a battery monomer, which comprises an electrode assembly, a shell, an insulating coating and an insulating film. The electrode assembly is accommodated in the shell. The outer side of the shell is provided with a recess. The insulating coating is coated on the outer surface of the shell, and at least part of the insulating coating is accommodated in the recess. The insulating film is wrapped on the outer surface of the shell and covers at least part of the recess. In the above structure, since the outer surface of the shell is coated with the insulating coating and at least part of the insulating coating is accommodated in the recess, the air in the recess is not prone to directly contact the shell, the electric field distribution of the air in the recess is improved, the risk of the air in the recess being broken down is reduced, the insulation performance of the outer surface of the battery monomer with the recess is improved, and the reliability of the battery monomer is improved. BRIEF DESCRIPTION OF DRAWINGS

[0035] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The detailed description is made with reference to the accompanying drawings.

[0036] FIG. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0037] FIG. 2 is a split structural schematic diagram of a battery device provided by some embodiments of the present application;

[0038] FIG. 3 is a split structural schematic diagram of a battery monomer provided by some embodiments of the present application;

[0039] FIG. 4 is a sectional view of a recess in a battery monomer provided by some embodiments of the present application;

[0040] Fig. 5 is a sectional view of a recess in a battery cell according to some embodiments of the present application;

[0041] Fig. 6 is a sectional view of a recess in a battery cell according to some other embodiments of the present application;

[0042] Fig. 7 is a sectional view of a recess in a battery cell according to some further embodiments of the present application;

[0043] Fig. 8 is a sectional view of an insulating film in a battery cell according to some embodiments of the present application;

[0044] Fig. 9 is a sectional view of an insulating film in a battery cell according to some other embodiments of the present application;

[0045] Fig. 10 is a sectional view of an insulating film in a battery cell according to some further embodiments of the present application;

[0046] Fig. 11 is a sectional view of a recess in a battery device according to some embodiments of the present application.

[0047] In the drawings: 1, vehicle; 2, battery device; 3, controller; 4, motor; 5, case; 5a, first case portion; 5b, second case portion; 5c, accommodation space; 7, battery cell; 20, housing; 201, recess; 2011, main face; 2012, transition face; 202, first shell wall; 203, first surface; 204, first portion; 205, second portion; 30, electrode assembly; 40, insulating film; 401, first film layer; 402, second film layer; 403, adhesive layer; 404, structural layer; 50, insulating coating; 8, heat exchange member. DETAILED DESCRIPTION

[0048] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0049] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meanings understood by the skilled in the art to which the embodiments of the present application belong.

[0050] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0051] In addition, the technical terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0052] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0053] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or it only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or it only means that the horizontal height of the first feature is less than that of the second feature.

[0054] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of battery, people's requirements for battery are also constantly improving.

[0055] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0056] The battery cell can be a secondary battery cell, which refers to a battery cell that can be activated by charging after discharging the battery cell.

[0057] The battery cell can be a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead storage battery cell, etc.

[0058] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square cell, a blade cell, a multi-prismatic battery cell, such as a hexagonal prismatic battery cell, etc.

[0059] In some embodiments, the battery device can be a battery module, and when there are a plurality of battery cells, the plurality of battery cells are arranged and fixed to form a battery module.

[0060] In some embodiments, the battery device can be a battery pack, and the battery pack includes a box body and a battery cell, and the battery cell or the battery module is accommodated in the box body.

[0061] In some embodiments, the box body can be part of the chassis structure of the vehicle. For example, part of the box body can be at least part of the floor of the vehicle, or part of the box body can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0062] In some embodiments, the battery device can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0063] In order to meet the requirements of output voltage, capacity, etc., a large number of battery cells are usually arranged in the battery device, and the plurality of battery cells in the battery device are usually arranged in close proximity in order to fully utilize the internal space of the battery device. This makes it risky for the housings of adjacent battery cells to overlap, and short circuits are likely to occur between adjacent battery cells.

[0064] At present, in order to reduce the risk of short circuit between adjacent battery monomers, an insulating film is usually wrapped on the shell of the battery monomer. However, due to the special design such as notch, convex rib and manufacturing defects such as uneven surface on the shell, the insulating film sometimes cannot be attached to the outer surface of the shell, and the concave part of the outer surface of the shell will exist between the insulating film. Under alternating voltage, the air may concentrate electric field, and when the peak of the electric field exceeds the dielectric strength of the air, the air will be broken down, which will reduce the insulation performance of the insulating film, and even damage the insulating film, reducing the reliability of the battery monomer.

[0065] In order to improve the reliability of the battery monomer, some embodiments of the present application provide a battery monomer, which comprises an electrode assembly, a shell, an insulating coating and an insulating film, the electrode assembly is contained in the shell, the outer side of the shell is provided with a concave part, the insulating coating is coated on the outer surface of the shell, and at least part of the insulating coating is contained in the concave part, and the insulating film is wrapped on the outer surface of the shell and covers at least part of the concave part. In the above structure, since the outer surface of the shell is coated with the insulating coating and at least part of the insulating coating is contained in the concave part, the air in the concave part is not easy to directly contact with the shell, the electric field distribution of the air in the concave part is improved, the risk of the air in the concave part being broken down is reduced, the insulation performance of the battery monomer with the concave part of the outer surface is improved, and the reliability of the battery monomer is improved.

[0066] The battery monomer described in the embodiments of the present application is suitable for a battery device and a power consumption device using the battery device.

[0067] The power consumption device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc.

[0068] The following embodiments take a vehicle as an example for convenience of description.

[0069] Fig. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present application.

[0070] As shown in FIG. 1, the vehicle 1 is provided with a battery device 2, which can be arranged at the bottom, head or tail of the vehicle 1. The battery device 2 can be used for power supply of the vehicle 1, for example, the battery device 2 can be used as the operating power source of the vehicle 1.

[0071] The vehicle 1 can further include a controller 3 and a motor 4, the controller 3 being used to control the battery device 2 to supply power to the motor 4, for example, for the power demand of the vehicle 1 during starting, navigation and driving.

[0072] In some embodiments of the present application, the battery device 2 can not only be used as the operating power source of the vehicle 1, but also be used as the driving power source of the vehicle 1, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1.

[0073] FIG. 2 is a schematic diagram of a split structure of the battery device according to some embodiments of the present application. As shown in FIG. 2, the battery device 2 includes a box body 5 and a battery cell 7, the battery cell 7 being contained in the box body 5. The battery cell 7 can be the smallest unit constituting a battery.

[0074] The box body 5 is used to contain the battery cell 7, and the box body 5 can have various structures. In some embodiments, the box body 5 can include a first box body part 5a and a second box body part 5b, the first box body part 5a and the second box body part 5b being mutually covered, and the first box body part 5a and the second box body part 5b together defining a containing space 5c for containing the battery cell 7. The second box body part 5b can be a hollow structure with one end open, and the first box body part 5a can be a plate-shaped structure, the first box body part 5a being covered on the open side of the second box body part 5b to form the box body 5 with the containing space 5c; or the first box body part 5a and the second box body part 5b can both be hollow structures with one side open, the open side of the first box body part 5a being covered on the open side of the second box body part 5b to form the box body 5 with the containing space 5c. Of course, the first box body part 5a and the second box body part 5b can have various shapes, such as a cylinder, a cuboid, etc.

[0075] To improve the sealing performance of the first box body part 5a and the second box body part 5b after being connected, a sealing member such as sealing glue, a sealing ring, etc. can be arranged between the first box body part 5a and the second box body part 5b.

[0076] Supposing that the first box body part 5a is covered on the top of the second box body part 5b, the first box body part 5a can also be referred to as an upper box cover, and the second box body part 5b can also be referred to as a lower box body.

[0077] In the battery device 2, the battery cell 7 can be one or multiple. If the battery cell 7 is multiple, the multiple battery cells 7 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that the multiple battery cells 7 are connected in series and in parallel. The multiple battery cells 7 can be directly connected in series, in parallel, or in a mixed connection, and then the multiple battery cells 7 are accommodated in the box 5 as a whole. Alternatively, the multiple battery cells 7 can be connected in series, in parallel, or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box 5.

[0078] The battery cell 7 can be a cylindrical battery cell, a square battery cell, or a battery cell of other shapes.

[0079] As shown in FIG. 3, in some embodiments, the battery cell 7 includes a housing 20 and an electrode assembly 30. The electrode assembly 30 is accommodated in the housing 20.

[0080] The housing 20 can be of various shapes and sizes, such as a cuboid, a hexagonal prism, etc. Specifically, the shape of the housing 20 can be determined according to the specific shape and size of the electrode assembly 30. The material of the housing 20 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiments of the present application do not make special limitations thereon.

[0081] The electrode assembly 30 is a component in which electrochemical reactions occur in the battery cell 7. One or more electrode assemblies 30 can be contained in the housing 20.

[0082] Some embodiments of the present application provide a battery cell 7, as shown in FIGS. 3 and 4, which includes an electrode assembly 30, a housing 20, an insulating coating 50, and an insulating film 40. The electrode assembly 30 is accommodated in the housing 20, and the housing 20 is provided with a recess 201 on the outer side thereof. The insulating coating 50 is coated on the outer surface of the housing 20, and at least part of the insulating coating 50 is accommodated in the recess 201. The insulating film 40 is wrapped on the outer surface of the housing 20, and the insulating film 40 covers at least part of the recess 201.

[0083] The electrode assembly 30 can include a tab and a separator. The tab can include a positive tab or a negative tab with opposite polarity, and the positive tab and the negative tab can serve as a positive electrode and a negative electrode, respectively. During the charging and discharging process of the battery cell 7, active ions (e.g., lithium ions) are inserted into and extracted from the positive electrode and the negative electrode. The separator is arranged between the positive tab and the negative tab, and is used to separate the positive tab and the negative tab, thereby preventing short circuit between the positive electrode and the negative electrode while allowing the active ions to pass through.

[0084] The electrolyte in the shell 20 plays a role of conducting ions between the positive electrode and the negative electrode of the electrode assembly 30. The electrolyte can be in a liquid state, a gel state or a solid state. The kind of electrolyte can be selected by those skilled in the art according to actual conditions.

[0085] The shell 20 can be a component in the battery cell 7 for enclosing a sealed space, which is used to accommodate other components in the battery cell 7. The insulating coating 50 can be a coating structure coated on the outer surface of the shell 20 away from the electrode assembly 30. Since the insulating coating 50 has good insulation capability, by coating the insulating coating 50 on the outer surface of the shell 20 away from the electrode assembly 30, the risk of short circuit between the outer surface of the shell 20 and other components can be reduced.

[0086] The recess 201 can refer to a structure formed by the outer surface of the shell 20 being inwardly recessed away from the electrode assembly 30. Exemplarily, it can be formed by a processing defect of the outer surface of the shell 20 or a processing notch on the outer surface of the shell 20 away from the electrode assembly 30, etc.

[0087] At least part of the insulating coating 50 can be accommodated in the recess 201. This can mean that the entire insulating coating 50 is located in the recess 201. Alternatively, the insulating coating 50 can be partially located in the recess 201 and partially located outside the recess 201, and the insulating coating 50 located outside the recess 201 is coated on the outer surface of the shell 20 connected to the inner wall surface of the recess 201.

[0088] The insulating film 40 can be a thin film structure having insulation performance. By covering the insulating film 40 on the outer surface of the shell 20, the insulation capability of the shell 20 can be improved, so that the battery cell 7 has good insulation capability and is not prone to short circuit with adjacent battery cells 7, which is conducive to improving the reliability of the battery device 2.

[0089] Exemplarily, the insulating film 40 can be made of plastic, rubber or other materials having insulation performance, so as to have good insulation performance.

[0090] The insulating film 40 covers at least part of the recess 201. This can mean that part of the recess 201 is covered by the insulating film 40. Alternatively, this can mean that the entire recess 201 is covered by the insulating film 40.

[0091] In the above structure, since the outer surface of the shell 20 is coated with the insulating coating 50 and at least part of the insulating coating 50 is accommodated in the recess 201, the air in the recess 201 is not prone to directly contact the shell 20, the electric field distribution of the air in the recess 201 is improved, the risk of the air in the recess 201 being broken down is reduced, the insulation performance of the outer surface of the battery cell 7 having the recess 201 is improved, and the reliability of the battery cell 7 is improved.

[0092] In some embodiments, referring to FIG. 5, the shell 20 includes a first shell wall 202, and the recess 201 is arranged on the first shell wall 202; in the thickness direction of the first shell wall 202, the projection of the recess 201 falls within the projection range of the insulating coating 50.

[0093] The first shell wall 202 can be a partial wall structure in the shell 20. The recess 201 is arranged on the first shell wall 202, which can be that the recess 201 is formed by the first shell wall 202 being inwardly recessed from the outer wall surface facing the electrode assembly 30.

[0094] By making the projection of the recess 201 in the thickness direction of the first shell wall 202 fall within the projection range of the insulating coating 50 in the thickness direction of the first shell wall 202, the insulating coating 50 is arranged on the inner wall surface of the entire recess 201, so that the inner wall surface of the entire recess 201 is not directly in contact with the air in the recess 201, reducing the possibility of the air in the recess 201 being broken down, and improving the insulation performance of the outer surface of the battery monomer 7 having the recess 201.

[0095] In some embodiments, referring to FIG. 6, the first shell wall 202 includes a first surface 203, and the recess 201 is recessed relative to the first surface 203, and part of the insulating coating 50 exceeds the recess 201 and is coated on the first surface 203.

[0096] The first surface 203 can refer to the outer surface of the first shell wall 202 facing away from the electrode assembly 30, and the recess 201 is arranged on the first surface 203 and is inwardly recessed from the first surface 203. Part of the insulating coating 50 exceeds the recess 201 and is coated on the first surface 203, which can be that the insulating coating 50 is not only coated on the inner wall surface of the entire recess 201, but also part of the insulating coating 50 exceeds the recess 201 and is coated on the first surface 203 in a certain direction of the circumferential direction of the recess 201, so that part of the first surface 203 connected with the inner wall surface of the recess 201 is coated with the insulating coating 50; it can also be that the insulating coating 50 is not only coated on the inner wall surface of the entire recess 201, but also part of the insulating coating 50 exceeds the recess 201 and is coated on the first surface 203 in the entire circumferential direction of the recess 201, so that the connection between the first surface 203 and the inner wall surface of the recess 201 is coated with the insulating coating 50, further reducing the possibility of the air in the recess 201 being broken down, and being conducive to improving the insulation performance of the first surface 203 of the battery monomer 7.

[0097] In some embodiments, referring to FIG. 7, the included angle between the side wall surface of the recess 201 and the outer surface of the first shell wall 202 is A, and 60°≤A<90°.

[0098] By setting the range of the included angle A between the side wall surface of the recess 201 and the outer surface of the first shell wall 202 to 60°≤A<90°, the corner of the air in the recess 201 can be increased, not only the electric field distribution in the air can be improved, which is conducive to reducing the electric field peak value at the corner and reducing the risk of local breakdown in the air, but also the corner of the air in the recess 201 is not easy to be too large, which is conducive to reducing the processing difficulty of the recess 201.

[0099] In some embodiments, 75°≤A<90°.

[0100] By setting the range of the included angle A between the side wall surface of the recess 201 and the outer surface of the first shell wall 202 to 75°≤A<90°, for example, the included angle A between the side wall surface of the recess 201 and the outer surface of the first shell wall 202 can be 75°, 80° or 85°, the corner of the air in the recess 201 can be increased, not only the electric field distribution in the air can be improved, which is conducive to reducing the electric field peak value at the corner and reducing the risk of local breakdown in the air, but also the corner of the air in the recess 201 is not easy to be too large, which is conducive to reducing the processing difficulty of the recess 201.

[0101] In some embodiments, with reference to FIG. 6, the side wall surface of the recess 201 includes a main surface 2011 and a transition surface 2012, and the transition surface 2012 is connected between the main surface 2011 and the outer surface of the first shell wall 202.

[0102] The inner wall surface of the recess 201 includes the side wall surface and the bottom wall surface connected to each other, the side wall surface can be the inner circumferential surface around the recess 201, and the bottom wall surface is arranged relative to the opening of the recess 201. The main surface 2011 can be the main part of the side wall surface of the recess 201, and the transition surface 2012 can be the part of the side wall surface of the recess 201 connected between the main surface 2011 and the outer surface of the first shell wall 202, which can play a transition role between the main surface 2011 and the outer surface of the first shell wall 202, so that the main surface 2011 and the outer surface of the first shell wall 202 can be well transitioned. For example, the transition surface 2012 can be an arc surface, or can be an inclined surface.

[0103] In some embodiments, at least part of the transition surface 2012 is configured as an arc surface.

[0104] By configuring at least part of the transition surface 2012 as an arc surface, the transition surface 2012 can be more smoothly connected between the main surface 2011 and the outer surface of the first shell wall 202, which is conducive to reducing the possibility of sharp corners at the corner and reducing the possibility of electric field concentration.

[0105] For example, the arc surface in the transition surface 2012 can be a circular arc surface, or can be an elliptical arc surface, and the shape of the arc surface can be set by the person skilled in the art according to the actual situation.

[0106] In some embodiments, at least part of the transition surface 2012 is configured as a plane.

[0107] By configuring at least part of the transition surface 2012 as a plane, the transition surface 2012 is able to connect between the main surface 2011 and the outer surface of the first shell wall 202 more gently, which is conducive to making the corner more gentle and reducing the possibility of electric field concentration at the corner.

[0108] In some embodiments, the radius of the arc surface is R, and 20 μm≤R≤100 μm.

[0109] By setting the range of the radius R of the arc surface as 20 μm≤R≤100 μm, not only is the arc surface large enough in radius to enable the arc surface to achieve a gentle transition between the main surface 2011 and the outer surface of the first shell wall 202, which is conducive to reducing the possibility of electric field concentration at the corner of the air; but also the arc surface is not easy to affect the structure of the recess 201 due to having too large a radius.

[0110] In some embodiments, the radius R of the arc surface is set to 40 μm≤R≤80 μm, and the radius R of the arc surface can be set to 50 μm, 60 μm, or 70 μm, for example. Not only is the arc surface large enough in radius to enable the arc surface to achieve a gentle transition between the main surface 2011 and the outer surface of the first shell wall 202, which is conducive to reducing the possibility of electric field concentration at the corner of the air; but also the arc surface is not easy to affect the structure of the recess 201 due to having too large a radius.

[0111] In some embodiments, the dielectric strength of the insulating coating 50 is P, and P≥400 kV / mm.

[0112] The dielectric strength is a measure of the electrical strength of a material as an insulator, which is the maximum voltage per unit thickness that a sample can withstand before being punctured. By setting the range of the dielectric strength P of the insulating coating 50 as P≥400 kV / mm, the insulating coating 50 has good insulating properties and is not easy to be punctured, so that the outer shell 20 is not easy to discharge and the air in the recess 201 is not easy to be punctured under the isolation of the insulating coating 50.

[0113] For example, the dielectric strength of the insulating coating 50 can be obtained by measuring the insulating coating 50 according to the national standard GB / T 1408.1-2006, and the specific measurement method can be referred to the national standard GB / T 1408.1-2006, which will not be described here.

[0114] In some embodiments, the insulating coating 50 includes at least one of a polyimide coating, an ultraviolet curing coating, and an epoxy coating.

[0115] The polyimide coating can refer to a coating structure formed by polyimide, the ultraviolet curing coating can refer to a coating structure formed by ultraviolet curing coating, and the epoxy coating can refer to a coating structure formed by epoxy resin.

[0116] The at least one of the polyimide coating, the ultraviolet curing coating and the epoxy coating included in the insulating coating 50 can refer to that the entire insulating coating 50 is the polyimide coating, or the entire insulating coating 50 is the ultraviolet curing coating, or the entire insulating coating 50 is the epoxy coating; or can refer to that the insulating coating 50 includes the polyimide coating and the ultraviolet curing coating arranged in layers, or the insulating coating 50 includes the polyimide coating and the epoxy coating arranged in layers, or the insulating coating 50 includes the ultraviolet curing coating and the epoxy coating arranged in layers; or can refer to that the insulating coating 50 includes the polyimide coating, the ultraviolet curing coating and the epoxy coating arranged in layers.

[0117] In some embodiments, the insulating coating 50 is made by an electrophoretic process, a spraying process or a printing process.

[0118] The electrophoretic process can be a process of depositing coating particles on a workpiece to form a coating structure under the action of electric field force. The spraying process can be a process of blowing coating into mist by airflow to adhere to the surface of the workpiece to form a coating structure. The printing process can be a process of printing coating on the surface of the workpiece to form a coating structure.

[0119] By making the insulating coating 50 by the electrophoretic process, the spraying process or the printing process, not only can the insulating coating 50 be firmly formed on the outer surface of the shell 20 and not easily fall off, but also the durability of the insulating coating 50 can be improved, and the insulating coating 50 can be conveniently formed on the inner wall surface of the recess 201.

[0120] In some embodiments, the thickness of the insulating coating 50 is set as H1, and the thickness of the insulating film 40 is set as H2, 1 / 4≤H1 / H2≤3 / 4.

[0121] By setting the ratio of the thickness H1 of the insulating coating 50 to the thickness H2 of the insulating film 40 as 1 / 4≤H1 / H2≤3 / 4, not only can the insulating coating 50 coated on the outer surface of the shell 20 have sufficient thickness to insulate the outer surface of the shell 20 together with the insulating film 40, but also the material waste of the insulating coating 50 can be avoided.

[0122] In some embodiments, the thickness of the insulating coating 50 is set as H1, and 30μm≤H1≤90μm.

[0123] By setting the thickness H1 of the insulating coating 50 in the range of 30 μm≤H1≤90 μm, not only does the insulating coating 50 have a sufficient thickness to achieve the insulating isolation of the air in the recess 201 from the shell 20, but also the thickness of the insulating coating 50 is not too large to cause waste of materials.

[0124] In some embodiments, the thickness H1 of the insulating coating 50 is set in the range of 60 μm≤H1≤90 μm, and the thickness H1 of the insulating coating 50 can be 75 μm, 80 μm or 85 μm, for example. Not only does the insulating coating 50 have a sufficient thickness to achieve the insulating isolation of the air in the recess 201 from the shell 20, but also the thickness of the insulating coating 50 is not too large to cause waste of materials.

[0125] In some embodiments, referring to FIG. 8, the insulating film 40 includes a first film layer 401 and a second film layer 402 stacked, and the first film layer 401 and the second film layer 402 are both polyethylene terephthalate film layers.

[0126] The first film layer 401 and the second film layer 402 are different film layer structures stacked in the insulating film 40, respectively. By having the insulating film 40 include the first film layer 401 and the second film layer 402 stacked, the mechanical strength of the insulating film 40 is improved.

[0127] The polyethylene terephthalate film layer can refer to a film layer structure made of polyethylene terephthalate. By setting the first film layer 401 and the second film layer 402 to be polyethylene terephthalate film layers, not only does the insulating film 40 have a large dielectric strength, but also has excellent mechanical strength and oil resistance, cold resistance and heat resistance.

[0128] For example, the first film layer 401 and the second film layer 402 in the insulating film 40 can also be made of different materials. The first film layer 401 and the second film layer 402 can also be made of polyimide, and a person skilled in the art can select the materials of the first film layer 401 and the second film layer 402 according to the actual situation.

[0129] In some embodiments, the thickness of the insulating film 40 is set to H2, 100 μm≤H2≤200 μm.

[0130] By setting the thickness H2 of the insulating film 40 in the range of 100 μm≤H2≤200 μm, not only does the insulating film 40 have a sufficient thickness to have good insulating properties, but also the insulating film 40 is not prone to waste of materials due to excessive thickness.

[0131] In some embodiments, the thickness H2 of the insulating film 40 is set in a range of 100 pm≤H2≤180 pm, and the thickness H2 of the insulating film 40 can be set to 110 pm, 130 pm or 150 pm, for example, so that the insulating film 40 has a sufficient thickness to have good insulation performance and is not prone to cause waste of material due to excessive thickness.

[0132] In some embodiments, the interlayer peeling strength of the insulating film 40 and the shell 20 is B, and B≥400 N / m.

[0133] By setting the interlayer peeling strength B of the insulating film 40 and the shell 20 in a range of B≥400 N / m, the bonding of the insulating film 40 and the outer surface of the shell 20 is firm, so that the insulating film 40 is not prone to fall off from the shell 20.

[0134] For example, the interlayer peeling strength B of the insulating film 40 and the shell 20 can be determined according to the national standard GB / T 2792-2014, and the specific determination method can refer to the national standard GB / T 2792-2014, which will not be described here.

[0135] In some embodiments, referring to FIG. 9, the insulating film 40 includes a structural layer 404 and an adhesive layer 403 arranged in layers, and the structural layer 404 is bonded to the outer surface of the shell 20 through the adhesive layer 403.

[0136] The adhesive layer 403 and the structural layer 404 are layered structures with different functions in the insulating film 40. The adhesive layer 403 can be formed by adhesive, and the structural layer 404 can be formed by the main material of the insulating film 40. The adhesive layer 403 can bond the structural layer 404 to the outer surface of the shell 20. The structural layer 404 is bonded to the outer surface of the shell 20 through the adhesive layer 403, so that the structural layer 404 can be firmly connected to the outer surface of the shell 20, thereby enabling the insulating film 40 to insulate and isolate the shell 20 from the outside.

[0137] In some embodiments, the interlayer peeling strength of the adhesive layer 403 and the structural layer 404 is greater than the interlayer peeling strength of the adhesive layer 403 and the shell 20.

[0138] By setting the interlayer peeling strength of the adhesive layer 403 and the structural layer 404 to be greater than the interlayer peeling strength of the adhesive layer 403 and the shell 20, the insulating film 40 is not prone to delamination, which is conducive to improving the structural integrity of the insulating film 40 and facilitating the complete peeling of the insulating film 40 from the shell 20 by tearing or the like.

[0139] In some embodiments, the adhesive layer 403 includes pressure-sensitive adhesive.

[0140] The pressure sensitive adhesive can be quickly adhered to the surface of the adherend under pressure, and after the adhering surface of the adherend is damaged, the pressure sensitive adhesive is not easy to contaminate the surface of the adherend, so that the insulating film 40 can be easily peeled off from the shell 20 and is not easy to contaminate the shell 20, and the insulating film 40 of the battery monomer 7 can be conveniently replaced.

[0141] Exemplarily, the pressure sensitive adhesive can include an acrylate pressure sensitive adhesive or a rubber system pressure sensitive adhesive. The rubber system pressure sensitive adhesive can be a natural rubber pressure sensitive adhesive, a synthetic rubber, a silicone pressure sensitive adhesive or a reclaimed rubber pressure sensitive adhesive.

[0142] In some embodiments, the shell 20 is a metal structure.

[0143] The shell 20 being a metal structure can mean that the shell 20 is made of a metal material. By setting the shell 20 as a metal structure, the shell 20 has good structural strength and can well protect the internal components.

[0144] Exemplarily, the shell 20 can be made of copper, iron, aluminum, stainless steel, aluminum alloy or the like.

[0145] In some embodiments, referring to FIG. 10, the shell 20 includes a first part 204 and a second part 205 connected to each other, and the recess 201 is arranged on the first part 204 so that the thickness of at least part of the first part 204 is less than the thickness of the second part 205.

[0146] The first part 204 and the second part 205 can be two parts connected to each other in the shell 20. By arranging the recess 201 on the first part 204 so that the thickness of at least part of the first part 204 is less than the thickness of the second part 205, the structural strength of the first part 204 is less than that of the second part 205. When the pressure in the shell 20 reaches a preset value, the recess 201 of the first part 204 will be broken, and the pressure in the shell 20 will be released from the broken part, so that the recess 201 can play a role in pressure relief.

[0147] Some embodiments of the present application also provide a battery device 2, referring to FIG. 11, the battery device 2 includes a heat exchange member 8 and the battery monomer 7 provided by the above technical solutions, the heat exchange member 8 exchanges heat with the battery monomer 7, and the recess 201 is arranged on the side of the shell 20 facing the heat exchange member 8.

[0148] The heat exchange member 8 can be a device capable of exchanging heat with the battery monomer 7. By arranging the heat exchange member 8 in the battery device 2, the battery monomer 7 can be in an appropriate temperature range by heat exchange with the heat exchange member 8, which is beneficial to make the battery monomer 7 have a good working state.

[0149] The recess 201 is arranged on the side of the shell 20 facing the heat exchange element 8. This means that the outer surface of the shell 20 facing the heat exchange element 8 is recessed inward to form the recess 201, and the outer surface of the shell 20 facing the heat exchange element 8 is coated with an insulating coating 50, at least part of the insulating coating 50 is arranged in the recess 201, so that the insulating coating 50 can improve the insulation performance between the shell 20 and the heat exchange element 8.

[0150] In some embodiments, the insulating coating 50 is arranged on the outer surface of the shell 20 perpendicular to the surface facing the heat exchange element 8, and the size G of the insulating coating 50 extending on the outer surface perpendicular to the surface facing the heat exchange element 8 in the direction away from the heat exchange element 8 is 10mm≤G≤30mm.

[0151] By arranging the insulating coating 50 on the outer surface of the shell 20 perpendicular to the surface facing the heat exchange element 8, the insulating coating 50 on the outer surface can be connected with the insulating coating 50 on the surface facing the heat exchange element 8, which can better improve the insulation performance between the shell 20 and the heat exchange element 8, and reduce the possibility of short circuit between the shell 20 and the heat exchange element 8.

[0152] In the direction away from the heat exchange element 8, by setting the size G of the insulating coating 50 extending on the outer surface perpendicular to the surface facing the heat exchange element 8 in the range of 10mm≤G≤30mm, not only can the insulating coating 50 on the outer surface perpendicular to the surface facing the heat exchange element 8 have sufficient height to increase the creepage distance between the shell 20 and the heat exchange element 8, and reduce the possibility of short circuit between the shell 20 and the heat exchange element 8, but also the height of the insulating coating 50 on the outer surface perpendicular to the surface facing the heat exchange element 8 is not prone to material waste due to being too large.

[0153] In some embodiments, the size G of the insulating coating 50 extending on the outer surface perpendicular to the surface facing the heat exchange element 8 is set in the range of 15mm≤G≤25mm. For example, the size G of the insulating coating 50 extending on the outer surface perpendicular to the surface facing the heat exchange element 8 can be set to 18mm, 20mm or 23mm. Not only can the insulating coating 50 on the outer surface perpendicular to the surface facing the heat exchange element 8 have sufficient height to increase the creepage distance between the shell 20 and the heat exchange element 8, and reduce the possibility of short circuit between the shell 20 and the heat exchange element 8, but also the height of the insulating coating 50 on the outer surface perpendicular to the surface facing the heat exchange element 8 is not prone to material waste due to being too large.

[0154] Some embodiments of the present application also provide a power consumption device, which comprises the battery device 2 provided by the above technical solutions, and the battery device 2 is used to provide electric energy.

[0155] Some embodiments of the present application provide a battery cell 7, which comprises an electrode assembly 30, a housing 20, an insulating coating 50 and an insulating film 40, the electrode assembly 30 is accommodated in the housing 20, the housing 20 comprises a first shell wall 202, the first shell wall 202 comprises a first surface 203, the first shell wall 202 is provided with a recess 201 recessed relative to the first surface 203, part of the insulating coating 50 is accommodated in the recess 201, part of the insulating coating 50 exceeds the recess 201 and is coated on the first surface 203, and the insulating film 40 is coated on the outer surface of the housing 20 and covers the recess 201. In the above structure, since the outer surface of the housing 20 is coated with the insulating coating 50 and at least part of the insulating coating 50 is accommodated in the recess 201, the air in the recess 201 is not easy to directly contact with the housing 20, the electric field distribution of the air in the recess 201 is improved, the risk of the air in the recess 201 being broken down is reduced, the insulation performance of the outer surface of the battery cell 7 with the recess 201 is improved, and the reliability of the battery cell 7 is improved.

[0156] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, comprising: an electrode assembly; a housing, wherein the electrode assembly is accommodated in the housing, and a recess is provided on an outer side of the housing; an insulating coating layer, which is coated on an outer surface of the housing, and at least a portion of the insulating coating layer is accommodated in the recess; an insulating film, which is wrapped on the outer surface of the housing, and the insulating film covers at least a portion of the recess.

2. The battery cell of claim 1, wherein, The housing comprises a first wall, and the recess is provided on the first wall. In a thickness direction of the first wall, a projection of the recess falls within a projection range of the insulating coating layer.

3. The battery cell of claim 2, wherein, The first wall comprises a first surface, and the recess is recessed relative to the first surface, and a portion of the insulating coating layer extends beyond the recess and is coated on the first surface.

4. The battery cell of claim 2 or 3, wherein, An included angle between a side wall surface of the recess and an outer surface of the first wall is A, and 60°≤A<90°.

5. The battery cell of claim 4, wherein, 75°≤A＜90°。 6. The battery cell of any one of claims 2 to 5, wherein, The side wall surface of the recess comprises a main surface and a transition surface, and the transition surface is connected between the main surface and the outer surface of the first wall.

7. The battery cell of claim 6, wherein, At least a portion of the transition surface is configured as an arc surface.

8. The battery cell of claim 6, wherein, At least a portion of the transition surface is configured as a plane.

9. The battery cell of claim 7, wherein, A radius of the arc surface is R, and 20μm≤R≤100μm.

10. The battery cell of claim 9, wherein, 40μm≤R≤80μm.

11. The battery cell of any one of claims 1 to 10, wherein, A dielectric strength of the insulating coating layer is P, and P≥400kV / mm.

12. The battery cell of any one of claims 1 to 11, wherein, The insulating coating layer comprises at least one of a polyimide coating layer, an ultraviolet curing coating layer and an epoxy coating layer.

13. The battery cell of any one of claims 1 to 12, wherein, The insulating coating layer is made by an electrophoretic process, a spraying process or a printing process.

14. The battery cell of any one of claims 1 to 13, wherein, A thickness of the insulating coating layer is H1, and a thickness of the insulating film is H2, and 1 / 4≤H1 / H2≤3 / 4.

15. The battery cell of any one of claims 1 to 14, wherein, The thickness of the insulating coating layer is H1, and 30μm≤H1≤90μm.

16. The battery cell of claim 15, wherein, 60μm≤H1≤90μm.

17. The battery cell of any one of claims 1 to 16, wherein, The insulating film comprises a first film layer and a second film layer which are stacked, and the first film layer and the second film layer are both polyethylene terephthalate film layers.

18. The battery cell of any one of claims 1 to 17, wherein, The thickness of the insulating film is H2, and 100μm≤H2≤200μm.

19. The battery cell of any one of claims 1 to 18, wherein, An interlayer peeling strength between the insulating film and the housing is B, and B≥400N / m.

20. The battery cell of any one of claims 1 to 19, wherein, The insulating film comprises a structural layer and an adhesive layer which are stacked, and the structural layer is bonded to the outer surface of the housing by the adhesive layer.

21. The battery cell of claim 20, wherein, The adhesive layer comprises a pressure sensitive adhesive.

22. The battery cell of any one of claims 1 to 21, wherein, The housing is a metal structure.

23. The battery cell of any one of claims 1 to 22, wherein, The housing comprises a first part and a second part which are connected to each other, and the recess is provided on the first part so that a thickness of at least a portion of the first part is smaller than a thickness of the second part. 24.A battery device, comprising a heat exchange member and the battery cell according to any one of claims 1 to 23, wherein the heat exchange member exchanges heat with the battery cell, and the recess of the battery cell is provided on a side of the housing facing the heat exchange member.

25. The battery device of claim 24, wherein, An insulating coating layer is provided on an outer surface of the housing which is perpendicular to a surface of the housing facing the heat exchange member, and in a direction away from the heat exchange member, a dimension of the insulating coating layer extending on the outer surface which is perpendicular to the surface of the housing facing the heat exchange member is G, and 10mm≤G≤30mm. 26.A power consuming device, comprising the battery device according to claim 24 or 25, wherein the battery device is used to provide electric energy.

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