Battery pack cover plate, battery box body, battery pack and power utilization device

Abstract

The utility model provides a battery pack cover plate, a battery box body, a battery pack and an electric device. The battery pack cover plate comprises a body, and an anti-corrosion coating and a heat insulation coating which are sequentially arranged on the body. According to the battery pack cover plate, the body of the battery pack cover plate is provided with the anti-corrosion coating and the heat insulation coating, the anti-corrosion coating and the heat insulation coating are firmly bonded on the body by utilizing self cohesiveness, and the risk that an upper cover of the battery pack is broken down due to thermal runaway is resisted by utilizing the heat insulation function of the coatings. At present, a power battery is usually loaded on a chassis of an electric automobile and located below a seat, the surface heat conductivity coefficient of a battery pack cover plate is reduced by arranging a heat insulation coating, and heat transfer between the battery and the environment is further restrained through the heat insulation function of the heat insulation coating. For example, the influence of the battery heat on the environment temperature in the automobile and the influence of the environment temperature in the cold environment on the battery are reduced, and particularly the endurance mileage of the electric automobile in the cold environment is prolonged.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack cover, battery housing, battery pack, and power supply device. Background Technology

[0002] The power battery pack is one of the most important parts of an electric vehicle. It mainly consists of secondary batteries, cooling systems, battery management systems (BMS), etc., located in the battery box.

[0003] Driven by the demand for lightweight new energy batteries, the thickness of battery box cover structures has been reduced from 1mm to 0.6mm or 0.8mm to decrease weight and cost. This has led to a decrease in the strength of the cover, especially in the event of thermal runaway, when the cell cover flies off and the battery box cover is at risk of being punctured. To reduce the risk of thermal runaway, high-temperature resistant mica sheets and foam are usually used in the battery box cover structure, with the mica sheets connected to the cover by adhesive. However, at high temperatures, the adhesive is prone to falling off, and the mica sheet itself decomposes and collapses at high temperatures, leading to thermal insulation failure. Utility Model Content

[0004] This application provides a battery pack cover, a battery housing, a battery pack, and an electrical device to solve the problem that mica plate covers cannot effectively reduce the risk of thermal runaway.

[0005] The first aspect of this application provides a battery pack cover, including a body and an anti-corrosion coating and a heat-insulating coating sequentially disposed on the body.

[0006] In any embodiment of the first aspect of this application, the heat-insulating coating is selected from epoxy resin coatings, polyurethane resin coatings, or silicone rubber coatings.

[0007] In any embodiment of the first aspect of this application, the thickness of the heat-insulating coating is 0.1 mm to 5 mm.

[0008] In any embodiment of the first aspect of this application, the thickness of the heat-insulating coating is 0.1 mm to 1 mm.

[0009] In any embodiment of the first aspect of this application, the heat-insulating coating is selected from polyurethane resin coating or silicone rubber coating, and the battery pack cover plate also includes a base coating layer disposed between the anti-corrosion coating and the heat-insulating coating.

[0010] In any embodiment of the first aspect of this application, the heat insulation coating is a polyurethane resin coating, and the primer is an epoxy resin primer.

[0011] In any embodiment of the first aspect of this application, the heat-insulating coating is an organosilicon rubber coating, and the primer is a silane coupling agent primer.

[0012] In any embodiment of the first aspect of this application, the thickness of the base coating is 30 μm-80 μm.

[0013] In any embodiment of the first aspect of this application, the peel strength of the heat-insulating coating is 2MPa-20MPa.

[0014] In any embodiment of the first aspect of this application, the anti-corrosion coating is a polyimide resin coating.

[0015] In any embodiment of the first aspect of this application, the thickness of the anti-corrosion coating is 30μm-60μm.

[0016] In any embodiment of the first aspect of this application, in an environment of 25°C, the side of the battery pack cover with the heat insulation coating is heated by flame. When the temperature of the side with the heat insulation coating reaches 1200°C and is maintained for 30 minutes, the temperature of the side of the battery pack cover without the heat insulation coating is ≤400°C.

[0017] In any embodiment of the first aspect of this application, the body includes a carbon steel body, an aluminum alloy body, or a stainless steel body.

[0018] A second aspect of this application provides a battery housing including a battery pack cover, the battery pack cover comprising any of the above-described battery pack covers.

[0019] A third aspect of this application provides a battery pack including a secondary battery and a battery housing. The battery housing has a receiving space in which the secondary battery is disposed. The battery housing is any of the battery housings provided in the second aspect. The heat-insulating coating of the battery pack cover of the battery housing is disposed on the side close to the secondary battery.

[0020] A fourth aspect of this application provides an electrical device including a battery pack, which includes any of the battery packs provided in the third aspect above.

[0021] An anti-corrosion coating and a heat-insulating coating are applied to the battery pack cover. These coatings adhere firmly to the cover using their own adhesive properties. The heat-insulating function of the coatings mitigates the risk of the battery pack cover being punctured due to thermal runaway. Currently, power batteries are typically mounted in the chassis of electric vehicles, under the seats. By applying a heat-insulating coating, the surface thermal conductivity of the battery pack cover is reduced, further suppressing heat transfer between the battery and the environment. This reduces the impact of battery heat on the vehicle's interior temperature and the effect of ambient temperature on the battery in cold environments, especially extending the driving range of electric vehicles in cold conditions. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0023] Figure 1 A partial cross-sectional schematic diagram of a battery pack cover provided in one embodiment of this application is shown.

[0024] Figure 2 A partial cross-sectional schematic diagram of a battery pack cover provided in another embodiment of this application is shown.

[0025] Figure 3 This is a schematic diagram of a secondary battery according to one embodiment of this application.

[0026] Figure 4 yes Figure 3 An exploded view of a secondary battery according to one embodiment of this application is shown.

[0027] Figure 5 This is a schematic diagram of a battery module according to one embodiment of this application.

[0028] Figure 6 This is a schematic diagram of a battery pack according to one embodiment of this application.

[0029] Figure 7 yes Figure 6 An exploded view of a battery pack according to one embodiment of this application is shown.

[0030] Figure 8 This is a schematic diagram of an electrical device that uses a secondary battery as a power source according to one embodiment of this application.

[0031] The accompanying drawings are not drawn to scale.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1 Battery pack; 2 Upper housing; 3 Lower housing; 4 Battery module; 5 Secondary battery cell; 51 Housing; 52 Electrode assembly; 53 Top cover assembly; 21 Body; 22 Anti-corrosion coating; 23 Base coating; 24 Heat insulation coating. Detailed Implementation

[0034] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0035] The following detailed description, with appropriate reference to the accompanying drawings, specifically discloses embodiments of the battery pack cover, battery housing, battery pack, and power-consuming device of this application. However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repetitive descriptions of practically identical structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided for the purpose of enabling those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0036] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, it is expected that ranges of 60-110 and 80-120 are also included. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise stated, the numerical range "ab" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" have been listed in this article; "0-5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0037] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0038] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0040] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0041] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0042] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0043] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0044] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0045] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0046] Under thermal runaway conditions, the battery pack cover is at risk of being punctured by splashing material from the cell top cover, leading to exposed flames and accelerating thermal runaway. Therefore, the battery pack cover needs heat insulation and impact resistance to ensure that it will not be punctured during thermal runaway. However, the current process using mica sheets is prone to adhesive peeling and the mica sheets are also prone to decomposition and collapse, thus the risk of thermal runaway cannot be effectively controlled.

[0047] To address the aforementioned problems, the first embodiment of this application provides a battery pack cover, such as... Figure 1 As shown, the battery pack cover includes a body 21 and an anti-corrosion coating 22 and a heat-insulating coating 24 disposed on the body 21.

[0048] An anti-corrosion coating 22 and a heat-insulating coating 24 are applied to the body 21 of the battery pack cover. The anti-corrosion coating 22 and the heat-insulating coating 24 are firmly bonded to the body using their own adhesive properties. The heat-insulating function of the coatings helps to mitigate the risk of the battery pack cover being punctured due to thermal runaway. Currently, power batteries are usually installed in the chassis of electric vehicles, located under the seats. By applying the heat-insulating coating 24, the surface thermal conductivity of the battery pack cover is reduced, and its heat-insulating function is used to further suppress the transfer of heat between the battery and the environment. For example, it reduces the impact of battery heat on the ambient temperature inside the vehicle, as well as the impact of ambient temperature on the battery in cold environments, especially extending the driving range of electric vehicles in cold environments.

[0049] The aforementioned coatings act as a restraint on the battery pack cover, thereby increasing its strength and further reducing the risk of thermal runaway.

[0050] The heat-insulating coating 24 used in this application can be a conventional organic coating with heat-insulating function. In some embodiments, the heat-insulating coating 24 is an epoxy resin coating, a polyurethane resin coating, or a silicone rubber coating. All of the above coatings have high high-temperature resistance. At the same time, each resin coating has a certain degree of impact resistance, which can alleviate the vibration of the battery pack cover caused by battery heat flow, improving the user experience.

[0051] The aforementioned epoxy resins, polyurethane resins, and silicone rubbers can all be made from conventional high-temperature resistant resin materials, and this application does not have any special requirements in this regard.

[0052] In some embodiments, in order to achieve sufficient flame retardancy without affecting the lightweight of the battery pack cover due to the use of flame retardant coating, the thickness of heat insulation coating 24 is set to 0.1mm-5mm (e.g., 0.1mm, 0.5mm, 0.8mm, 1mm, 2mm, 3mm, 4mm or 5mm), and can be further selected as 0.1mm-1mm.

[0053] To further improve the adhesion of the heat insulation coating 24, in some embodiments, such as Figure 2 As shown, for example, when the heat insulation coating 24 is selected from polyurethane resin coating or silicone rubber coating, the battery pack cover also includes a base coating 23, which is disposed between the anti-corrosion coating 22 and the heat insulation coating 24.

[0054] In some embodiments, the heat insulation coating 24 is a polyurethane resin coating, and the primer coating 23 is an epoxy resin primer coating. The epoxy resin primer coating not only has high temperature resistance, but also has strong adhesion, which can improve the adhesion of the polyurethane resin coating to the anti-corrosion coating 22, thereby extending the service life of the battery pack.

[0055] In some embodiments, the heat-insulating coating 24 is a silicone rubber coating, and the primer coating 23 is a silane coupling agent primer coating. The amphiphilic properties of the silane coupling agent are utilized to improve the adhesion between the silicone rubber coating and the anti-corrosion coating 22.

[0056] In some embodiments, the thickness of the base coating 23 is 30 μm-80 μm, for example, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm or 80 μm.

[0057] In some embodiments, the peel strength of the heat insulation coating 24 is 3 MPa-12 MPa.

[0058] In some embodiments, the anti-corrosion coating 22 is a polyimide resin coating. Polyimide not only has good anti-corrosion effect, but also has high adhesion to the substrate and high temperature resistance.

[0059] In some embodiments, the thickness of the anti-corrosion coating 22 is 30μm-60μm, for example, 30μm, 40μm, 50μm or 60μm.

[0060] In some embodiments, the side of the battery pack cover with the heat-insulating coating 24 is heated by flame in an environment of 25°C. When the temperature of the side with the heat-insulating coating 24 reaches 1200°C and is maintained for 30 minutes, the temperature of the side of the battery pack cover without the heat-insulating coating 24 is ≤400°C. It is evident that the battery pack cover of this application has a strong heat insulation effect, thereby effectively reducing the risk of thermal runaway.

[0061] Specifically, the heat insulation effect test method is as follows:

[0062] 1) Ignite the spray gun and preheat it for one minute. Place the spray gun in a suitable position and keep the position unchanged. Adjust the height of the iron stand to stabilize the temperature at the flame end at 1200℃. Keep the height of the iron stand unchanged. This position is the standard position for subsequent tests. Move the flame gun to a safe position.

[0063] 2) After fixing the thermocouple sensor wire to the cold side (the surface without the heat insulation coating 24) of the battery pack cover with high temperature tape, fix it to the standard position and turn on the thermocouple tester to record the data.

[0064] 3) Within 20 seconds, move the flame gun from the safe position to the standard position to heat and burn the surface of the battery pack cover with the heat insulation coating 24.

[0065] 4) After 30 minutes of combustion, the thermocouple tester stops recording and automatically stores the data. Although the thermocouple test data varies depending on the thickness of the insulation coating 24, the thermocouple recorded temperature does not exceed 400°C within the thickness range used in this application.

[0066] In order to shield the electromagnetic waves generated inside the battery box and propagating outward during use, and to shield external electromagnetic waves to avoid interference with the acquisition of signals such as battery temperature, in some embodiments, the main body 21 is set to be a metal body.

[0067] In order to improve the strength of the body 21, in some embodiments, the body 21 includes a carbon steel body, an aluminum alloy body, or a stainless steel body.

[0068] The second embodiment of this application provides a battery housing, including a battery pack cover, which includes any of the battery pack covers provided in the first aspect above.

[0069] The third embodiment of this application provides a battery pack including a secondary battery and a battery housing. The battery housing has a receiving space, in which the secondary battery is disposed. The battery housing is the same as the battery housing provided in the second embodiment. The flame-retardant coating 23 of the battery pack cover of the battery housing is disposed on the side close to the secondary battery.

[0070] The aforementioned secondary batteries, also known as rechargeable batteries or storage batteries, are batteries that can be recharged after being discharged to activate the active materials and continue to be used.

[0071] Typically, a secondary battery consists of a positive electrode, a negative electrode, a separator, and an electrolyte. During charging and discharging, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, primarily prevents short circuits while allowing active ions to pass through. The electrolyte, also positioned between the positive and negative electrodes, mainly serves to conduct active ions.

[0072] In some implementations, the positive electrode, negative electrode, and separator can be fabricated into an electrode assembly using a winding or stacking process.

[0073] In some implementations, the secondary battery includes a single secondary battery cell or a battery module.

[0074] In some embodiments, the secondary battery may include an outer packaging. This outer packaging may be used to encapsulate the electrode assembly and electrolyte described above.

[0075] In some embodiments, the outer packaging of the secondary battery can be a hard shell, such as a hard plastic shell, an aluminum shell, or a steel shell. The outer packaging of the secondary battery can also be a soft pack, such as a pouch. The material of the soft pack can be plastic; examples of plastics include polypropylene, polybutylene terephthalate, and polybutylene succinate.

[0076] The shape of the secondary battery cell can be cylindrical, prismatic, pouch, or other shapes. Prismatic cells include prismatic cells, blade-shaped cells, and multi-prismatic cells, such as hexagonal prismatic cells. This application does not impose any particular limitations. For example, Figure 3 The example shown is a square-structured secondary battery cell 5.

[0077] In the embodiments of this application, the secondary battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0078] In some implementations, refer to Figure 4 The outer packaging may include a housing 51 and a top cover assembly 53. The housing 51 may include a base plate and side plates connected to the base plate, the base plate and side plates forming a receiving cavity. The housing 51 has an opening communicating with the receiving cavity, and the top cover assembly 53 can cover the opening to close the receiving cavity. The positive electrode, negative electrode, and separator can be formed into an electrode assembly 52 by a winding process or a stacking process. The electrode assembly 52 is encapsulated within the receiving cavity. Electrolyte is immersed in the electrode assembly 52. ​​The number of electrode assemblies 52 contained in the secondary battery cell 5 can be one or more, which can be selected by those skilled in the art according to specific practical needs.

[0079] In some implementations, the secondary battery cells can be assembled into a battery module. The number of secondary battery cells contained in the battery module can be one or more, and the specific number can be selected by those skilled in the art according to the application and capacity of the battery module.

[0080] Figure 5 This is battery module 4, used as an example. (See reference...) Figure 5In battery module 4, multiple secondary battery cells 5 can be arranged sequentially along the length of battery module 4. Of course, they can also be arranged in any other manner. Furthermore, these multiple secondary battery cells 5 can be fixed in place using fasteners.

[0081] Optionally, the battery module 4 may also include a housing with a receiving space in which multiple secondary battery cells 5 are received.

[0082] In some embodiments, the battery modules described above can also be assembled into a battery pack, and the number of battery modules contained in the battery pack can be one or more, the specific number of which can be selected by those skilled in the art according to the application and capacity of the battery pack.

[0083] Figure 6 and Figure 7 This is battery pack 1 as an example. (See reference...) Figure 6 and Figure 7 The battery pack 1 may include a battery housing and a secondary battery consisting of multiple battery modules 4 disposed within the battery housing. The battery housing includes an upper housing 2 and a lower housing 3, with the upper housing 2 covering the lower housing 3 to form a closed space for accommodating the battery modules 4. The multiple battery modules 4 can be arranged in any manner within the battery housing. Of course, the above is an example of a battery pack configuration; regardless of the battery pack's arrangement, it will always have a top cover.

[0084] In some implementations, the aforementioned secondary battery cells can also be directly integrated into the battery pack, that is, the secondary battery cells are placed in the battery housing. In other words, the above battery pack solution is applicable to all types of battery packs, such as CTC (Cell to Chassis), CTP (Cell to Pack), and CTB (Cell to Body) battery pack solutions.

[0085] In addition, this application also provides an electrical device, which includes the battery pack provided in this application. The battery pack can be used as a power source for the electrical device, or as an energy storage unit for the electrical device. The electrical device may include, but is not limited to, mobile devices (e.g., mobile phones, laptops, etc.), electric vehicles (e.g., pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0086] Figure 8 This is an example of an electrical device. The device could be a pure electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle. To meet the high power and high energy density requirements of the secondary battery for this device, a battery pack or battery module can be used.

[0087] [Example]

[0088] Example 1

[0089] like Figure 1 As shown, the battery pack cover includes an aluminum alloy body, an anti-corrosion coating 22 and a heat insulation coating 24 sequentially disposed on one side surface of the aluminum alloy body. The anti-corrosion coating 22 is a polyimide resin coating with a thickness of 60μm, and the heat insulation coating 24 is an epoxy resin coating with a thickness of 2mm.

[0090] Example 2

[0091] like Figure 2 As shown, the battery pack cover includes an aluminum alloy body, an anti-corrosion coating 22, a base coating 23, and a heat insulation coating 24 sequentially disposed on one side surface of the aluminum alloy body. The anti-corrosion coating 22 is a polyimide resin coating with a thickness of 30μm, the base coating 23 is an epoxy resin base coating with a thickness of 30μm, and the heat insulation coating 24 is a polyurethane resin coating with a thickness of 1mm.

[0092] Example 3

[0093] like Figure 2 As shown, the battery pack cover includes an aluminum alloy body, an anti-corrosion coating 22, a base coating 23, and a heat insulation coating 24 sequentially disposed on one side surface of the aluminum alloy body. The anti-corrosion coating 22 is a 30μm thick polyimide resin coating, the base coating 23 is a 50μm thick silane coupling agent base coating, and the heat insulation coating 24 is a 0.5mm thick silicone rubber coating.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery pack cover, wherein, It includes a body and an anti-corrosion coating and a heat insulation coating sequentially disposed on the body, wherein the thickness of the anti-corrosion coating is 30μm-60μm.

2. The battery pack cover according to claim 1, wherein, The heat insulation coating is selected from epoxy resin coating, polyurethane resin coating or silicone rubber coating.

3. The battery pack cover according to claim 1 or 2, wherein, The thickness of the heat insulation coating is 0.1mm-5mm.

4. The battery pack cover according to claim 3, wherein, The thickness of the heat insulation coating is 0.1 mm - 1 mm.

5. The battery pack cover according to claim 1, wherein, The heat insulation coating is selected from polyurethane resin coating or silicone rubber coating, and the battery pack cover plate also includes a base coating, which is disposed between the anti-corrosion coating and the heat insulation coating.

6. The battery pack cover according to claim 5, wherein, The heat insulation coating is a polyurethane resin coating, and the primer is an epoxy resin primer.

7. The battery pack cover according to claim 5, wherein, The heat insulation coating is an organosilicon rubber coating, and the primer is a silane coupling agent primer.

8. The battery pack cover according to any one of claims 5 to 7, wherein, The thickness of the base coating is 30μm-80μm.

9. The battery pack cover according to any one of claims 1 to 7, wherein, The heat-insulating coating is configured to have a peel strength of 2MPa-20MPa.

10. The battery pack cover according to any one of claims 1 to 7, wherein, The anti-corrosion coating is a polyimide resin coating.

11. The battery pack cover according to any one of claims 1 to 7, wherein, The heat-insulating coating is configured such that, in an environment of 25°C, when the side of the battery pack cover with the heat-insulating coating is heated by a flame, after the temperature of the side with the heat-insulating coating reaches 1200°C and is maintained for 30 minutes, the temperature of the side of the battery pack cover without the heat-insulating coating is ≤400°C.

12. The battery pack cover according to any one of claims 1 to 7, wherein, The body may be made of carbon steel, aluminum alloy or stainless steel.

13. A battery housing, comprising a battery pack cover, wherein, The battery pack cover includes the battery pack cover as described in any one of claims 1 to 12.

14. A battery pack comprising a secondary battery and a battery housing, the battery housing having a receiving space, the secondary battery being disposed within the receiving space, wherein, The battery housing is the battery housing as described in claim 13, and the heat insulation coating of the battery pack cover of the battery housing is disposed on the side close to the secondary battery.

15. An electrical device comprising a battery pack, wherein the battery pack comprises the battery pack of claim 14.

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