Battery and electric equipment

Abstract

The utility model relates to a battery and electric equipment. The battery comprises a box body and a battery cell group, the box body is provided with an inner wall, and at least part of the inner wall is provided with a first composite coating; the battery cell group is arranged in the box body and is arranged on the first composite coating; wherein the conductivity of the first composite coating is smaller than that of the inner wall; the heat conductivity coefficient of the first composite coating is smaller than that of the inner wall; according to the application, the first composite coating is arranged on the inner wall of the box body, and then the battery cell group is arranged on the first composite coating; the conductivity of the first composite coating is smaller than that of the inner wall; the heat conductivity coefficient of the first composite coating is smaller than that of the inner wall, so that the first composite coating can play a role in reducing electric power and heat transfer between the inner wall and the battery cell group.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a battery and electrical equipment. Background Art

[0002] A battery is an integrated unit composed of multiple cells that is used to store and provide electrical energy.

[0003] In the related art, the battery includes a box and a battery cell group arranged in the box. However, the insulation and heat insulation performance of the current box are poor, which will affect the performance of the battery cell group. In view of this, how to improve the insulation and heat insulation performance of the box in the battery is a technical problem that needs to be solved urgently. Summary of the invention

[0004] In view of the above problems, the present application provides a battery and electrical equipment, aiming to improve the insulation and heat insulation performance of the box in the battery.

[0005] In a first aspect, the present application provides a battery, the battery comprising:

[0006] A box body, the box body having an inner wall, at least a portion of which is provided with a first composite coating;

[0007] The battery cell group is arranged in the box body and on the first composite coating;

[0008] The electrical conductivity of the first composite coating is smaller than the electrical conductivity of the inner wall; and the thermal conductivity of the first composite coating is smaller than the thermal conductivity of the inner wall.

[0009] In the technical solution of the embodiment of the present application, a first composite coating is arranged on the inner wall of the box body, and then the battery cell group is arranged on the first composite coating; that is, the first composite coating is arranged between the battery cell group and the inner wall. Since the electrical conductivity of the first composite coating is lower than the electrical conductivity of the inner wall, the thermal conductivity of the first composite coating is lower than the thermal conductivity of the inner wall; therefore, the first composite coating can play a role in reducing power conduction and heat insulation between the inner wall and the battery cell group.

[0010] In some embodiments, the first composite coating includes an insulating layer. That is, the conductivity of the first composite coating is close to 0, which is beneficial to improving the insulation protection performance of the box body to the battery cell group.

[0011] In some embodiments, the insulating layer is a ceramic composite film layer. Selecting a ceramic composite film layer as the first composite coating is not only conducive to ensuring the insulation performance of the first composite coating, but also conducive to improving the hardness and thermal insulation performance of the first composite coating.

[0012] In some embodiments, the first composite coating includes a heat-insulating layer. That is, the heat-insulating layer can be made of a heat-insulating material, which generally has a low thermal conductivity and can provide a good heat-insulating effect between the inner wall and the battery cell group, thereby ensuring that the battery cell group is in a temperature-stable working environment.

[0013] In some embodiments, the thermal conductivity of the first composite coating is less than 10 W / mK.

[0014] In some embodiments, the battery pack includes:

[0015] A shell, at least one side of which is provided with an opening;

[0016] At least one battery cell is disposed in the shell and has a first portion exposed to the opening; the first portion is in contact with the first composite coating.

[0017] In some embodiments, the battery cell group includes at least two battery cells arranged at intervals; and

[0018] A separator is arranged between two adjacent battery cells.

[0019] In the technical solution of the embodiment of the present application, the first composite coating is used to reduce the impact of the external high temperature environment on the battery cell group; the heat in the battery cell group can be well suppressed, so some insulation structures can be simplified to reduce costs. In this embodiment, only the isolation member is used to prevent two adjacent battery cells from contacting each other, so as to avoid the situation where the temperature of a single battery cell is too high and the adjacent battery cell is thermally runaway, so as to ensure that the battery cell group is in a normal temperature environment.

[0020] In some embodiments, the isolation member is an insulating thermal isolation member.

[0021] In some embodiments, the first composite coating covers an area of ​​the inner wall corresponding to the first portion.

[0022] In some embodiments, an adhesive layer is disposed on a side of the first composite coating close to the first portion, and the adhesive layer is bonded to the battery cell assembly.

[0023] In some embodiments, the first composite coating completely covers the inner wall, which is helpful to improve the thermal insulation and insulation performance of the entire area of ​​the inner wall of the box.

[0024] In some embodiments, the box body further comprises an outer wall disposed opposite to the inner wall, and a second composite coating is disposed on the outer wall, wherein the hardness of the second composite coating is greater than that of the outer wall, so as to improve the scratch resistance and wear resistance of the outer surface of the box body.

[0025] In some embodiments, the hardness of the second composite coating is between 300-500 HV.

[0026] In some embodiments, the second composite coating is made of the same material as the first composite coating.

[0027] In a second aspect, the present application also provides an electrical device, which includes the above-mentioned battery.

[0028] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0030] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0031] Figure 2 A schematic diagram of the structure of a battery provided in some embodiments of the present application;

[0032] Figure 3 A schematic diagram of the structure of a battery provided in some other embodiments of the present application;

[0033] Figure 4 A schematic diagram of the structure of a battery provided in some other embodiments of the present application;

[0034] Figure 5 A schematic diagram of the structure of a battery pack provided in some embodiments of the present application;

[0035] Figure 6 A schematic diagram of the structure of a battery provided in some further embodiments of the present application;

[0036] Figure 7 Schematic diagram of the structure of batteries provided in yet other embodiments of the present application.

[0037] The reference numerals in the specific implementation manner are as follows:

[0038] 100-vehicle, 110-battery, 120-controller, 130-motor, 10-housing, 11-first part, 12-second part, 13-inner wall, 14-outer wall, 20-battery cell group, 21-battery cell, 22-isolator, 30-first composite coating, 40-adhesive layer, 50-second composite coating. DETAILED DESCRIPTION

[0039] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0041] In the description of the embodiments of the present application, if the technical terms "first" or "second" appear, they are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0042] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0043] In the description of the embodiments of the present application, the term "plurality" refers to more than two (including two).

[0044] In the description of the embodiments of the present application, if technical terms such as "middle", "length" (width), "thickness", "up", "down", "inside" and "outside" appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the embodiments of the present application.

[0045] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, if technical terms such as "installed", "connected", "connected", "fixed" and the like appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0046] A battery is an integrated unit composed of multiple battery cells, used to store and provide electrical energy. A battery module is usually composed of multiple single cells, which are connected in series or in parallel to achieve the required voltage and capacity.

[0047] In the related art, the battery includes a case and a battery cell group arranged in the case. However, the insulation and heat insulation performance of the current case are poor, which will affect the performance of the battery cell group. Specifically, currently, a plurality of insulating strips are arranged at intervals on the inner wall of the case, and the insulating strips can play an insulating role between the case and the battery cell group; however, since the structure between the insulating strip and the case is not completely stable, it is also necessary to set a gap between two adjacent insulating strips, and connect the battery cell group and the case by setting an adhesive layer on the gap to achieve the fixation of the battery cell group and the case. However, on the one hand, the current insulation strip has poor heat insulation ability, which is easy to cause the problem of overheating of the battery cell group; on the other hand, the gap between two adjacent insulating strips will reduce the insulation protection ability of the battery cell group, and at the same time, only relying on the gap area to bond the battery cell group will also reduce the fixing effect of the battery cell group.

[0048] It is understandable that the insulating strip is usually a plastic strip, which has poor thermal insulation performance. At the same time, since there is a gap between two adjacent insulating strips, and there is only an adhesive layer in the gap, the gap area will also cause the thermal insulation performance of the battery pack to decrease. In the case of insufficient thermal insulation performance of the box, the battery pack is easily affected by the temperature of the external environment of the box, causing the battery pack to overheat; in an exemplary description, if the electrical equipment is a vehicle, when the vehicle collides or catches fire, the battery pack is prone to explosion due to insufficient thermal insulation performance of the box.

[0049] Moreover, since there is no insulating strip in the gap area, the conductivity of the gap area must be greater than that of the insulating strip area, so the battery pack may break through the gap area and cause battery failure. At the same time, the gap area is also used to lay the adhesive layer, and the battery pack is bonded and fixed by the adhesive layer. In other words, if the gap area is set too small, although the area of ​​the insulating strip can be made larger, which is conducive to increasing the insulation protection effect of the battery pack, it will inevitably reduce the fixing effect of the adhesive layer in the gap on the battery pack; conversely, if the gap area is set too large, although it is conducive to enhancing the fixing effect of the adhesive layer in the gap on the battery pack, it will inevitably reduce the area of ​​the insulating strip to reduce the insulation protection effect of the battery pack.

[0050] In order to improve the thermal insulation and insulating properties of a battery box, an embodiment of the present application provides a battery, which includes a box and a cell group; the box has an inner wall, and a first composite coating is provided on at least a portion of the inner wall; the cell group is arranged in the box and on the first composite coating; wherein the electrical conductivity of the first composite coating is less than the electrical conductivity of the inner wall; and the thermal conductivity of the first composite coating is less than the thermal conductivity of the inner wall.

[0051] In the battery provided in the embodiment of the present application, a first composite coating is provided on the inner wall of the box body, and then the battery cell group is provided on the first composite coating; since the electrical conductivity of the first composite coating is lower than the electrical conductivity of the inner wall; the thermal conductivity of the first composite coating is lower than the thermal conductivity of the inner wall, the first composite coating can reduce the transfer of electricity and heat between the inner wall and the battery cell group.

[0052] The battery involved in the embodiment of the present application can be used in electrical equipment that uses the battery as a power source, or in various energy storage systems that use the battery as an energy storage element. Electrical equipment may be, but is not limited to, vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc. The vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0053] For the convenience of explanation, the following embodiments are described by taking a vehicle as an example of an electrical device in some embodiments of the present application.

[0054] See also Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 100 provided in an embodiment of the present application. A battery 110 is provided inside the vehicle 100, and the battery 110 can be provided at the bottom, head, or tail of the vehicle 100. The battery 110 can be used to power the vehicle 100, for example, the battery 110 can be used as an operating power source for the vehicle 100. The vehicle 100 may also include a controller 120 and a motor 130, and the controller 120 is used to control the battery 110 to power the motor 130, for example, for starting, navigating, and driving the vehicle 100.

[0055] In some embodiments of the present application, the battery 110 can not only serve as an operating power source for the vehicle 100 , but also serve as a driving power source for the vehicle 100 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100 .

[0056] See also Figure 2 , Figure 2 Schematic diagram of an explosion of a battery provided in an embodiment of the present application. The battery 110 includes a case 10, a battery cell group 20 and a power distribution device, and the battery cell group 20 is contained in the battery case 10. Among them, the case 10 is used to provide a storage space for the battery cell group 20, and the case 10 can adopt a variety of structures. In some embodiments, the case 10 may include a first part 11 and a second part 12, 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 storage space for accommodating the battery cell group 20. The second part 12 may be a hollow structure with one end open, 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 storage space; 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 case 10 formed by the first part 11 and the second part 12 may be in a variety of shapes, such as a cylinder, a cuboid, etc. In some embodiments, the box 10 can be used as part of the bottom structure of the vehicle body. For example, part of the box can become at least a part of the bottom plate of the vehicle body, or part of the box can become at least a part of the crossbeam and longitudinal beam of the vehicle body. In the battery 110, there can be multiple battery cell groups 20, and the multiple battery cell groups 20 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cell groups 20 are both connected in series and in parallel.

[0057] In some embodiments, multiple battery cell groups 20 can be directly connected in series, in parallel, or in hybrid connection, and then the whole formed by the multiple battery cell groups 20 is accommodated in the box 10; of course, the battery 110 can also be a battery module formed by connecting multiple battery cell groups 20 in series, in parallel, or in hybrid connection, and then the multiple battery modules are connected in series, in parallel, or in hybrid connection to form a whole, and accommodated in the box 10. The battery 110 may also include other functional components. For example, the battery 110 may also include a busbar component for realizing electrical connection between the multiple battery cell groups 20. Each battery cell group 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell group 20 may include a plurality of battery cells 21, and the battery cells 21 may be cylindrical, flat, rectangular or other shapes. Among them, a secondary battery refers to a battery cell that can be used continuously by activating the active material by charging after the battery cell 21 is discharged, and a primary battery refers to a battery cell 21 that cannot be used continuously by activating the active material by charging after the power of the battery cell 21 is exhausted; the battery cell 21 may also be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., but is not limited thereto. The battery cell 21 may 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 shell battery cell, a blade-shaped battery cell, and a multi-prismatic battery cell, and the multi-prismatic battery cell is, for example, a hexagonal battery cell, etc., and the present application has no special restrictions.

[0058] The power distribution device is a device used to distribute electric energy to various electrical appliances in the vehicle. The power distribution device can be a high-voltage power distribution device, that is, the power distribution device is used to distribute electric energy to high-voltage electrical appliances, and the high-voltage electrical appliances can be but are not limited to electric drive devices, etc. The power distribution device can also be a low-voltage power distribution device, that is, the power distribution device is used to distribute electric energy to low-voltage electrical appliances, and the low-voltage electrical appliances can be but are not limited to instrument panels, headlights, electric seats, etc. The power distribution device includes a fixing component, which is used to fix the pre-charging resistor.

[0059] The battery 110 provided in the embodiment of the present application is described below with reference to the accompanying drawings.

[0060] In some embodiments, see Figure 3 , Figure 3 The schematic diagram of the structure of the battery 110 provided in this embodiment is shown. The battery 110 of this embodiment includes a box body 10 and a battery cell group 20. The box body 10 has an inner wall 13, and a first composite coating 30 is disposed on at least a portion of the inner wall 13; the battery cell group 20 is disposed in the box body 10 and on the first composite coating 30; wherein the electrical conductivity of the first composite coating 30 is less than the electrical conductivity of the inner wall 13; and the thermal conductivity of the first composite coating 30 is less than the thermal conductivity of the inner wall 13.

[0061] It is understood that the cell group 20 refers to a power supply unit formed by assembling one or more cells; the battery 110 refers to an integral unit formed by assembling one or more cell groups 20 and battery management components. The housing 10 refers to an outer shell used to wrap the cell group 20 and the battery management components, which can protect the internal cell group 20 from damage such as extrusion, collision and puncture. The housing 10 has an inner cavity, which can be used to accommodate the cell group 20; the inner wall 13 refers to the inner wall of the housing 10 close to the cell group 20. "At least part of the inner wall 13 is provided with a first composite coating 30" means that the first composite coating 30 can be provided on part of the inner wall 13, or the first composite coating 30 can be provided on the entire inner wall 13. Composite coating refers to a coating system composed of two or more different materials, which can be metals, alloys, ceramics, plastics or other types of coating materials, which are combined together through a specific process method to form a coating with unique properties and functions. The electrical conductivity of the first composite coating 30 is less than that of the inner wall 13, which means that the electrical resistance of the first composite coating 30 is greater than that of the inner wall 13; the thermal conductivity of the first composite coating 30 is less than that of the inner wall 13, which means that the thermal insulation performance of the first composite coating 30 is stronger than that of the inner wall 13.

[0062] In the technical solution of the embodiment of the present application, a first composite coating 30 is arranged on the inner wall 13 of the box body 10, and then the battery cell group 20 is arranged on the first composite coating 30; that is, the first composite coating 30 is arranged between the battery cell group 20 and the inner wall 13. Since the electrical conductivity of the first composite coating 30 is less than the electrical conductivity of the inner wall 13, the thermal conductivity of the first composite coating 30 is less than the thermal conductivity of the inner wall 13; therefore, the first composite coating 30 can play a role in reducing power conduction and heat insulation between the inner wall 13 and the battery cell group 20.

[0063] It is understandable that by adding the first composite coating 30, the power conduction between the inner wall 13 and the battery cell group 20 is reduced to reduce the risk of current leakage or even breakdown of the box 10, which is conducive to reducing the electrical contact between the battery cell group 20 and other components outside the battery 110. If the battery cell group 20 is in electrical contact with other components outside the battery 110, it may cause safety risks such as short circuit and excessive current, and may even cause serious accidents such as fire and explosion.

[0064] It is understandable that by adding the first composite coating 30, a heat insulation effect can also be achieved between the inner wall 13 and the battery cell group 20. It should be explained that during the operation of the battery 110, the battery cell group 20 therein is easily affected by the external ambient temperature of the box body 10, thereby causing temperature fluctuations. Especially in a high-temperature external environment, the heat accumulation in the battery cell group 20 can easily lead to thermal runaway of the battery cell group 20, thereby causing safety accidents such as fire and explosion. The first composite coating 30 in the embodiment of the present application is conducive to reducing the temperature fluctuations caused by the external environment of the battery cell group 20, making the temperature of the battery cell group 20 more stable, which is conducive to improving the service life of the battery.

[0065] In the related art, multiple insulating strips are added side by side on the inner wall 13 of the box 10 to play an insulating role; there is a gap between two adjacent insulating strips for bonding the battery cell group 20. If the gap is too large, the area of ​​the insulating strip will be reduced, thereby reducing the insulation protection effect. If the gap is too small, the fixing effect of the adhesive layer in the gap on the battery cell group 20 will be reduced. In addition, in the related art, an insulating powder spray layer is set on the inner wall 13 of the box 10, but the density of the insulating powder spray layer is not high; the gap between the insulating particles in the insulating powder spray layer is large, which is relatively easier to be broken down by the current. In contrast, in the technical solution of this embodiment, the first composite coating 30 has a high density, and the battery cell group 20 can be directly set on the first composite coating 30. The battery cell group 20 can be directly bonded by setting an adhesive layer on the first composite coating 30, which can ensure the fixing effect of the battery cell group 20 while enhancing the insulation protection effect of the battery cell group 20.

[0066] In some embodiments, please refer to Figure 3 , the first composite coating 30 of this embodiment includes an insulating layer.

[0067] It is understood that the insulating layer can be made of insulating material, which refers to a material that is not conductive at an allowable voltage, but is not an absolutely non-conductive material. In other words, the conductivity of the first composite coating 30 is close to 0, which is conducive to improving the insulation protection performance of the box 10 to the battery cell group 20.

[0068] In some embodiments, the electrical conductivity of the insulating material is between 10 -30 S / m to 10 -10 Between S / m.

[0069] In some embodiments, the insulating material includes at least one of polyethylene, polyurethane, polyimide, and ceramic.

[0070] In some embodiments, please refer to Figure 3, the insulating layer of this embodiment is a ceramic composite film layer. It is understandable that ceramic materials have excellent insulating properties, high hardness and low thermal conductivity. Therefore, in the technical solution of this embodiment, the ceramic composite film layer is selected as the first composite coating 30, which is not only conducive to ensuring the insulating properties of the first composite coating 30, but also conducive to improving the hardness and thermal insulation properties of the first composite coating 30.

[0071] In some embodiments, the first composite coating 30 of this embodiment is a ceramic composite film layer of nano zirconium and titanium. It is understandable that due to the high thermal resistance and low thermal conductivity of the ceramic material itself, the ceramic composite film layer of nano zirconium and titanium can effectively block the transfer of heat and reduce the heat loss when the heat passes through the material. At the same time, since the ceramic material itself has a high resistivity, it is difficult for the current to pass through, so the ceramic composite film layer of nano zirconium and titanium can provide a good insulation effect. And due to the high hardness of the ceramic material itself, coupled with the strengthening effect of nano zirconium and titanium scale, the ceramic composite film layer of nano zirconium and titanium can have more excellent wear resistance, scratch resistance and pressure resistance.

[0072] In some embodiments, please refer to Figure 3 , the first composite coating 30 of this embodiment includes a heat insulation layer.

[0073] It is understood that the heat insulating layer is made of a heat insulating material, which refers to a material with low thermal conductivity, used to reduce heat transfer and block the flow of heat. In other words, the heat insulating material usually has a low thermal conductivity. The heat insulating layer made of the heat insulating material can provide a good heat insulating effect between the inner wall 13 and the battery cell group 20, thereby ensuring that the battery cell group 20 is in a temperature-stable working environment.

[0074] In some embodiments, the thermal conductivity of the first composite coating 30 is less than 10W / mk. It should be explained that the unit of thermal conductivity is Watt per meter Kelvin (W / mK), where Watt (W) is the unit of power, indicating the rate of heat transfer, meter (m) is the unit of length, indicating the distance of heat transfer, and Kelvin (K) is the unit of temperature. The thermal conductivity represents the amount of heat transferred by changing the unit temperature difference through a material of unit area and unit thickness in unit time. In the related art, the housing is usually made of aluminum alloy material, and the thermal conductivity of aluminum alloy material is 130W / mk. By setting the thermal conductivity of the first composite coating 30 to be less than 10W / mk, the thermal insulation effect of the first composite coating 30 is much greater than the thermal insulation effect of the housing 10 itself.

[0075] In some embodiments, see Figure 4 , Figure 4A schematic structural diagram of a battery 110 provided in this embodiment is shown; the battery cell group 20 of this embodiment includes a shell and at least one battery cell 21; at least one side of the shell is provided with an opening; at least one battery cell 21 is arranged in the shell, and the battery cell 21 has a first portion 11 exposed to the opening; the first portion 11 is in contact with the first composite coating 30.

[0076] It should be explained that the battery cell 21 is a single electrochemical cell 21 containing positive and negative electrodes, which is the smallest unit of the battery and is composed of a positive electrode, a negative electrode and an electrolyte. The battery cell group 20 is composed of one or more battery cells 21 connected in series and parallel to provide higher voltage and capacity to meet the use requirements of the equipment. For example, 12 battery cells 21 can be assembled into a module, and then 16 modules can be assembled into a power battery. Such a battery pack can provide sufficient power for electric vehicles and other equipment.

[0077] In the technical solution of the embodiment of the present application, the bottom of the battery cell 21 is directly disposed on the first composite coating, which is beneficial to reducing the material cost of the shell.

[0078] In some embodiments, see Figure 5 , Figure 5 The schematic diagram of the structure of the battery cell group 20 provided in this embodiment is shown; the battery cell group 20 of this embodiment includes at least two battery cells 21 and an isolating member 22; at least two battery cells 21 are arranged at intervals; the isolating member 22 is arranged between two adjacent battery cells 21 to separate the two adjacent battery cells 21.

[0079] It should be explained that two adjacent cells 21 refer to a single cell 21 that is closest to another cell 21 among the multiple cells 21. By providing a separator 22 between two adjacent cells 21, a stable gap can be provided between the two adjacent cells 21 to prevent the two cells 21 from contacting each other.

[0080] In the related art, it is necessary to add a whole-surface heat insulation board between two adjacent battery cells 21 to reduce the temperature interference between the battery cells 21. That is, when a single battery cell 21 is in thermal runaway, the other battery cells 21 can still maintain a normal operating temperature. However, the solution of setting up a heat insulation board in this way will result in very high costs. However, in the technical solution of the embodiment of the present application, the first composite coating 30 is used to reduce the impact of the external high temperature environment on the battery cell group 20; the heat in the battery cell group 20 can be well suppressed to ensure that the temperature in the battery cell group 20 is not too high, so that some of the heat insulation structures in the battery cell group can be simplified to reduce costs. In this embodiment, only the isolation member 22 is used to prevent the two adjacent battery cells 21 from contacting each other, so as to avoid the situation where the temperature of a single battery cell 21 is too high and causes the adjacent battery cell 21 to thermally runaway, thereby ensuring that the battery cell group 20 is in a normal temperature environment.

[0081] In some embodiments, please continue to refer to Figure 5 , the spacer 22 of this embodiment is a quadrilateral frame structure or a triangular frame structure; or the spacer 22 is a grid-like structure formed by splicing a quadrilateral frame and / or a triangular frame.

[0082] In some embodiments, the spacer 22 can form a frame structure in the shapes of "日", "口", "田", "凵", "冂", "A", etc.

[0083] In some embodiments, the spacer 22 is an insulating and heat-insulating member.

[0084] In some embodiments, the spacer 22 is a rubber frame, which has good insulation and heat-insulating properties.

[0085] In some embodiments, the battery cell group 20 includes a plurality of battery cells 21, and the plurality of battery cells 21 are arranged in multiple rows and multiple columns, and the spacer 22 is disposed between any two adjacent battery cells 21.

[0086] In some embodiments, the first composite coating 30 covers the area on the inner wall 13 corresponding to the first part.

[0087] In some embodiments, please refer to Figure 6 , Figure 6 which is a schematic structural diagram of the battery 110 provided in this embodiment; on the side of the first composite coating 30 close to the first part, there is an adhesive layer 40, and the adhesive layer 40 is bonded to the battery cell group 20.

[0088] In some embodiments, the adhesive layer 40 is made of an insulating and impact-resistant adhesive, which is beneficial to improving the impact resistance at the bottom of the battery cell 21.

[0089] In some embodiments, the tear strength of the insulating and impact-resistant adhesive is greater than 110 KN / m.

[0090] In some embodiments, the first composite coating 30 completely covers the inner wall 13. In this way, it is beneficial to improve the heat insulation performance and insulation performance of the entire area of the inner wall 13 of the box body 10.

[0091] In some embodiments, please refer to Figure 7 , Figure 7 which shows a schematic structural diagram of the battery 110 provided in this embodiment. The box body 10 of this embodiment further has an outer wall 14 disposed opposite to the inner wall 13, and a second composite coating 50 is provided on the outer wall 14, and the hardness of the second composite coating 50 is greater than the hardness of the outer wall 14. In this way, it is beneficial to improve the scratch resistance and wear resistance of the outer surface of the box body 10.

[0092] In some embodiments, the hardness of the second composite coating 50 is between 300 - 500 HV.

[0093] In some embodiments, the second composite coating 50 is made of the same material as the first composite coating 30 .

[0094] In some embodiments of the present application, the battery 110 of this embodiment includes a box body 10 and a battery cell group 20, the box body 10 includes an inner wall 13, and the battery cell group 20 includes a shell and a plurality of battery cells 21 arranged in the shell. The plurality of battery cells 21 are directly fixed on the first composite coating 30 through an adhesive layer 40. Among them, the first composite coating 30 is a ceramic composite film layer of nano zirconium and titanium; the first composite coating 30 has high thermal insulation, high insulation, high hardness and other properties, and the high thermal insulation performance can ensure that the battery cell group 20 works within a safe temperature range, and the high insulation performance can reduce the risk of the battery cell group 20 breaking through the box body 10, and the high hardness performance is conducive to improving the life of the box body 10 and improving the structural stability between the first composite coating 30 and the battery cell group 20.

[0095] Specifically, the box body 10 further comprises an outer wall 14 disposed opposite to the inner wall 13 , and a second composite coating 50 is disposed on the outer wall 14 . The second composite coating 50 and the first composite coating 30 are made of the same material.

[0096] In a second aspect, the present application further provides an electric device, the electric device comprising the above-mentioned battery 110. In some embodiments, the electric device is a vehicle 100.

[0097] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery, characterized in that: The battery comprises: A box body, the box body having an inner wall, at least a portion of the inner wall being provided with a first composite coating; A battery cell group is arranged in the box and on the first composite coating; Among them, the electrical conductivity of the first composite coating is smaller than the electrical conductivity of the inner wall; and the thermal conductivity of the first composite coating is smaller than the thermal conductivity of the inner wall.

2. The battery according to claim 1, characterized in that The first composite coating includes an insulating layer.

3. The battery according to claim 2, characterized in that The insulating layer is a ceramic composite film layer.

4. The battery according to claim 1, characterized in that The first composite coating includes a thermal barrier layer.

5. The battery according to claim 4, characterized in that The thermal conductivity of the first composite coating is less than 10 W / mk.

6. The battery according to claim 1, characterized in that The battery pack comprises: A housing, wherein at least one side of the housing is provided with an opening; At least one battery cell is disposed in the housing and has a first portion exposed to the opening; the first portion is in contact with the first composite coating.

7. The battery according to claim 6, characterized in that The battery cell group includes at least two battery cells arranged at intervals; and A separator is arranged between two adjacent battery cells.

8. The battery according to claim 7, characterized in that The isolating member is a frame structure member having a hollow area.

9. The battery according to claim 7 or 8, characterized in that: The isolating element is an insulating and heat-insulating element.

10. The battery according to any one of claims 6 to 9, characterized in that: The first composite coating covers an area of ​​the inner wall corresponding to the first portion.

11. The battery according to any one of claims 1 to 9, characterized in that: An adhesive layer is provided on a side of the first composite coating close to the battery cell group, and the adhesive layer is bonded to the battery cell group.

12. The battery according to any one of claims 1 to 9, characterized in that: The first composite coating completely covers the inner wall.

13. The battery according to any one of claims 1 to 9, characterized in that: The box body also has an outer wall arranged opposite to the inner wall, and a second composite coating is arranged on the outer wall. The hardness of the second composite coating is greater than the hardness of the outer wall.

14. The battery according to claim 13, characterized in that The hardness of the second composite coating is 300-500 HV.

15. The battery according to claim 13, characterized in that The second composite coating is made of the same material as the first composite coating.

16. An electrical equipment, characterized in that: The electrical device comprises the battery according to any one of claims 1 to 14.

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