Battery and electric apparatus

Abstract

A battery (2) and an electric apparatus. The battery (2) comprises a battery cell (7) and a metal component (6). The battery cell (7) comprises a first outer wall face (701), and the first outer wall face (701) is provided with a weak portion (702). The metal component (6) is arranged opposite the first outer wall face (701), wherein the first outer wall face (701) is provided with a first insulating protective layer (703), and the first insulating protective layer (703) is connected to the first outer wall face (701); and the first insulating protective layer (703) covers at least part of the weak portion (702). A weak portion (702) is provided, such that a battery cell (7) can tear at the weak portion (702), so as to discharge substances from the battery cell (7), thereby reducing the temperature and air pressure inside the battery cell (7), and thus improving the reliability of the battery cell (7) during operation. Moreover, providing a first insulating protective layer (703) on at least part of the surface of the weak portion (702) to form insulating protection reduces the risk of short circuits caused by lap contact between the torn weak portion (702) and the metal component (6), thereby improving the operation stability of batteries (2).

Description

Batteries and electrical devices Technical Field

[0001] This application relates to the field of batteries, and in particular to a battery and an electrical device. Background Technology

[0002] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, power tools, and energy storage systems, etc.

[0003] Currently, improving the reliability of battery operation is a research direction in battery technology.

[0004] Summary of the Invention

[0005] This application provides a battery and an electrical device that can improve the reliability of battery operation.

[0006] In a first aspect, this application provides a battery, including a battery cell and a metal component. The battery cell includes a first outer wall surface, and the first outer wall surface has a weak portion. The metal component is disposed opposite to the first outer wall surface. The first outer wall surface is provided with a first insulating protective layer, which is connected to the first outer wall surface. Furthermore, the first insulating protective layer covers at least a portion of the weak portion.

[0007] In the technical solution of this application, by setting a weak point, the battery cell can be torn apart from the weak point, thereby expelling the material inside the battery cell, reducing the internal temperature and pressure of the battery cell, reducing the risk of the battery cell exploding or burning, improving the reliability of the battery cell during operation, and reducing the damage caused by the battery cell to surrounding components or personnel. Furthermore, a first insulating protective layer is formed on at least a portion of the surface of the weak point to create insulation protection, reducing the risk of short circuits caused by the weak point contacting metal components after tearing, and improving the stability of battery operation.

[0008] In some embodiments, the battery cell further includes a first inner wall surface opposite to the first outer wall surface along the wall thickness direction, the first inner wall surface being provided with a second insulating protective layer, the second insulating protective layer covering at least a portion of the area on the first inner wall surface corresponding to the weak portion along the wall thickness direction.

[0009] In the above structure, a second protective layer is provided on the first inner wall surface of the battery cell to further reduce the risk of short circuit caused by the weak part tearing and overlapping with the metal parts, thereby improving the stability of battery operation.

[0010] In some embodiments, the first insulating protective layer includes a polyimide layer, and / or the second insulating protective layer includes a polyimide layer. Polyimide possesses good insulation and heat resistance properties, which can provide good protection for the first and second outer walls of the battery cell, reducing the risk of short circuits caused by contact between the first and / or second outer walls and metal components. Simultaneously, it can maintain good performance during battery cell operation, reducing the risk of the first and / or second insulating protective layers decomposing or detaching from the battery cell at high temperatures.

[0011] In some embodiments, the weak portion includes a first weak portion and a second weak portion disposed on the first outer wall surface and intersecting therebetween. The first weak portion and the second weak portion intersect to form a first intersecting portion. The first end of the first weak portion and the second end of the second weak portion are both spaced apart from the first intersecting portion. The line connecting the first end and the second end is a first connecting line. The first weak portion, the second weak portion and the first connecting line together define a first folding area. The first insulating protective layer covers and connects at least a portion of the first folding area on the first outer wall surface.

[0012] In the above structure, by setting the first weak part and the second weak part to intersect, a bent curve can be formed, which facilitates the tearing of the first outer wall along the curve, allowing the material inside the battery cell to be released in a timely manner, thereby improving the reliability of the battery cell operation. Covering at least part of the first folded area with the first insulating protective layer can reduce the risk of short circuits caused by the first folded area contacting the metal components, thereby improving the stability of battery operation.

[0013] In some embodiments, the battery cell further includes a first inner wall surface opposite to the first outer wall surface along the wall thickness direction. The first inner wall surface is provided with a second insulating protective layer, which covers at least a portion of the area on the first inner wall surface corresponding to the first folded area along the wall thickness direction. In the above structure, by providing the second insulating protective layer, insulation protection is formed in the first folded area of ​​the first inner wall surface of the battery cell, reducing the risk of short circuits caused by contact between residual liquid on the first inner wall surface of the battery cell and metal components, and improving the stability of battery operation.

[0014] In some embodiments, the weak portion further includes a third weak portion, which intersects with the second weak portion to form a second intersection portion. The first weak portion and the third weak portion are spaced apart. A third end portion located on the third weak portion is spaced apart from the second intersection portion. The line connecting the third end portion and the first end portion is a second connecting line. The first weak portion, the second weak portion, the third weak portion, and the second connecting line together define a second folding area. The first insulating protective layer covers and connects at least a portion of the second folding area on the second outer wall surface.

[0015] In the above structure, by setting the third weak part to intersect with the second weak part, a bent curve can be formed, which facilitates the tearing of the first outer wall along the curve, allowing the material inside the battery cell to be released in a timely manner, thereby improving the reliability of the battery cell operation. Covering at least part of the second folded area with the first insulating protective layer can reduce the risk of short circuits caused by the second folded area overlapping with metal components, thereby improving the stability of battery operation.

[0016] In some embodiments, the battery cell further includes a first inner wall surface opposite to the first outer wall surface along the wall thickness direction. The first inner wall surface is provided with a second insulating protective layer, which covers at least a portion of the area on the first inner wall surface corresponding to the second folded area along the wall thickness direction. In the above structure, by providing the second insulating protective layer, insulation protection is formed in the second folded area of ​​the first inner wall surface of the battery cell, reducing the risk of short circuits caused by contact between residual liquid on the first inner wall surface of the battery cell and metal components, and improving the stability of battery operation.

[0017] In some embodiments, the weak portion includes an arc-shaped weak portion, which includes a starting end and a terminating end. The line connecting the starting end and the terminating end is a third connecting line. The arc-shaped weak portion and the third connecting line together define a third folded region. The first insulating protective layer covers and connects to at least a portion of the third folded region on the first outer wall surface. In the above structure, by providing the arc-shaped weak portion, the first outer wall surface of the battery cell can be easily torn along an arc-shaped path, allowing the material inside the battery cell to be released in a timely manner, thereby improving the reliability of the battery cell operation. Covering at least a portion of the third folded region with the first insulating protective layer can reduce the risk of short circuits occurring when the third folded region overlaps with metal components, thereby improving the stability of battery operation.

[0018] In some embodiments, the battery cell further includes a first inner wall surface opposite to the first outer wall surface along the wall thickness direction. The first inner wall surface is provided with a second insulating protective layer, which covers at least a portion of the area on the first inner wall surface corresponding to the third folded area along the wall thickness direction. In the above structure, by providing the second insulating protective layer, insulation protection is formed in the third folded area of ​​the first inner wall surface of the battery cell, reducing the risk of short circuits caused by contact between residual liquid on the first inner wall surface of the battery cell and metal components, and improving the stability of battery operation.

[0019] In some embodiments, the weak portion includes an annular weak portion defining a fourth folded region, and a first insulating protective layer covers and connects to at least a portion of the fourth folded region on the first outer wall surface. In the above structure, by providing the annular weak portion, the first outer wall surface of the battery cell can be easily torn open along an annular path, allowing timely release of substances inside the battery cell and improving the reliability of battery cell operation. Covering at least a portion of the fourth folded region with the first insulating protective layer reduces the risk of short circuits occurring when the fourth folded region overlaps with metal components, thereby improving the stability of battery operation.

[0020] In some embodiments, the battery cell further includes a first inner wall surface opposite to the first outer wall surface along the wall thickness direction. The first inner wall surface is provided with a second insulating protective layer, which covers at least a portion of the area on the first inner wall surface corresponding to the fourth folded area along the wall thickness direction. In the above structure, by providing the second insulating protective layer, insulation protection is formed in the fourth folded area of ​​the first inner wall surface of the battery cell, reducing the risk of short circuits caused by contact between residual liquid on the first inner wall surface of the battery cell and metal components, thereby improving the reliability of battery operation.

[0021] In some embodiments, the conductivity of the first insulating protective layer is 5 × 10⁻⁶. -11 μS / cm~1×10 -10 μS / cm. The above structure, by limiting the conductivity of the first insulating protective layer, improves the insulation performance of the first insulating protective layer, reduces the risk of short circuit in the first insulating protective layer, and improves the reliability of the battery cell operation.

[0022] In some embodiments, the melting point of the first insulating protective layer is greater than or equal to 400°C. By limiting the melting point of the first insulating protective layer, the heat resistance of the first insulating protective layer is improved, the risk of high-temperature decomposition or detachment from the first wall surface is reduced, and the reliability of battery operation is improved.

[0023] In some embodiments, the first insulating protective layer is a coating, or the first insulating protective layer is bonded to the first outer wall surface by adhesive. The above structure improves the structural strength of the connection between the first insulating protective layer and the first outer wall surface, reduces the risk of the first insulating protective layer detaching, and improves the insulation effect.

[0024] In some embodiments, the first outer wall surface is provided with protrusions and / or recesses, and the first insulating protective layer covers the protrusions and / or recesses on the first outer wall surface. In the above structure, the area of ​​the first surface can be increased, the structural strength of the connection between the first insulating layer and the pressure relief portion can be enhanced, the risk of damage to the first insulating layer can be reduced, and the insulation performance can be improved.

[0025] In some embodiments, the metal component is a thermal management component, which includes a metal housing and a receiving cavity for containing heat exchange fluid. The above structure reduces the risk of a short circuit between the battery cell's weak point and the heat exchange assembly, improving the stability of the battery heat exchange process and the overall operational stability of the battery cell.

[0026] In some embodiments, the metal component is provided with a clearance structure, which is disposed opposite to the weak point along a first direction. In the above-described structure, the clearance structure can avoid at least a portion of the substances released by the battery cell, thereby reducing the risk of the thermal management component blocking the release of substances.

[0027] In some embodiments, the metal component is provided with a third insulating protective layer, at least a portion of which is disposed within the clearance structure. In the above structure, the third insulating protective layer can separate the battery cell from the thermal management component, reducing the risk of electrical conduction between the thermal management component and the battery cell, further reducing the risk of insulation failure, and improving the reliability of battery operation.

[0028] In some embodiments, the clearance structure includes a clearance recess disposed on the side of the metal component facing the battery cell. The metal component includes a clearance wall defining the clearance recess. A projection plane perpendicular to the thickness direction of the metal component is projected along the thickness direction of the metal component, and the projection of the weak portion lies within the projection of the clearance recess. At least a portion of the third insulating protective layer is disposed on the clearance wall. By providing the clearance recess, this application can increase the distance between the battery cell and the clearance wall. The second insulating layer can insulate and isolate the clearance wall of the clearance recess from the battery cell, and increase the creepage distance and insulation gap between the thermal management component and the battery cell, thereby reducing the risk of battery cell discharge.

[0029] In some embodiments, the clearance structure further includes a through-hole penetrating the clearance wall, wherein the orthographic projection of the weak portion along the thickness direction of the metal component on the metal component at least partially overlaps with the through-hole, and the wall of the through-hole is provided with a fourth insulating protective layer. In the above structure, substances released from the battery cell can pass through the through-hole, thereby reducing the risk of thermal management components blocking substance release, improving the efficiency of internal pressure release of the battery cell, and reducing safety risks. The fourth insulating layer can cover the wall surface of the through-hole, increasing the creepage distance between the hole wall surface and the battery cell, thereby reducing the risk of battery cell discharge and improving insulation safety performance.

[0030] Secondly, this application provides an electrical device that includes the battery described in the above embodiments, the battery being used to provide electrical energy.

[0031] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0032] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0033] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of this application;

[0034] Figure 2 is a schematic diagram of an explosion of a battery provided in one embodiment of this application;

[0035] Figure 3 is a schematic diagram of the structure of a battery cell provided in an embodiment of this application;

[0036] Figure 4 is a partial structural diagram of a battery cell and metal components provided in an embodiment of this application;

[0037] Figure 5 is a schematic diagram of the structure of a weak part provided in an embodiment of this application;

[0038] Figure 6 is a structural schematic diagram of a weak part provided in another embodiment of this application;

[0039] Figure 7 is a structural schematic diagram of a weak part provided in another embodiment of this application;

[0040] Figure 8 is a structural schematic diagram of the protrusion and the recess provided in an embodiment of this application;

[0041] Figure 9 is a schematic diagram of the avoidance structure provided in an embodiment of this application;

[0042] Figure 10 is a schematic diagram of the structure of the third insulating protective layer provided in an embodiment of this application;

[0043] Figure 11 is a schematic diagram of the structure of the fourth insulating protective layer provided in an embodiment of this application;

[0044] Figure 12 is a schematic diagram of the structure of a through hole provided in one embodiment of this application.

[0045] Detailed explanation of the reference numerals in the attached figures:

[0046] 1. Vehicle; 2. Battery; 10. Electrode assembly; 20. Housing; 30. End cap; 40. Outer shell; 3. Controller; 4. Motor; 5. Housing; 51. First housing section; 52. Second housing section; 53. Accommodation space; 6. Metal component; 601. Clearance structure; 602. Third insulating protective layer; 603. Fourth insulating protective layer; 604. Through hole; 7. Battery cell; 701. First outer wall surface; 702. Weak part; 703. First insulating protective layer; 704. Second insulating protective layer; 705. First inner wall surface; 706. First weak part; 707. Second weak part; 708. First folding area; 709. Third weak part; 710. Second folding area; 711. Arc-shaped weak part; 712. Third folding area; 713. Annular weak part; 714. Fourth folding area; 715. Protrusion; 716. Recess. Detailed Implementation

[0047] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0052] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0053] 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.

[0054] In the description of the embodiments of this application, unless otherwise expressly specified and limited, 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0055] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0056] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0057] In this application, "multiple" means two or more (including two).

[0058] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0059] Battery cells may include, but are not limited to, lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-metal hydride battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc.

[0060] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0061] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0062] In some embodiments, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. As shown in Figure 2, multiple battery cells are stacked along the thickness direction to form a battery module.

[0063] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0064] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0065] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0066] The battery disclosed in this application can be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0067] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0068] Figure 1 is a schematic diagram of the structure of a vehicle provided in some embodiments of this application.

[0069] As shown in Figure 1, a battery 2 is installed inside the vehicle 1. The battery 2 can be located at the bottom, front, or rear of the vehicle 1. The battery 2 can be used to power the vehicle 1; for example, the battery 2 can serve as the operating power source for the vehicle 1.

[0070] Vehicle 1 may also include controller 3 and motor 4. Controller 3 is used to control battery 2 to supply power to motor 4, for example, for the power needs of vehicle 1 during start-up, navigation and driving.

[0071] In some embodiments of this application, the battery 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0072] Figure 2 is an exploded schematic diagram of a battery provided in some embodiments of this application. As shown in Figure 2, the battery 2 includes a housing 5 and a battery cell 7, with the battery cell 7 housed within the housing 5.

[0073] The housing 5 is used to accommodate the battery cell 7, and the housing 5 can have various structures. In some embodiments, the housing 5 may include a first housing portion 51 and a second housing portion 52, which overlap each other, and together define a receiving space 53 for accommodating the battery cell. The second housing portion 52 may be a hollow structure with one end open, and the first housing portion 51 may be a plate-like structure, with the first housing portion 51 covering the open side of the second housing portion 52 to form a housing 5 with the receiving space 53; alternatively, both the first housing portion 51 and the second housing portion 52 may be hollow structures with one side open, with the open side of the first housing portion 51 covering the open side of the second housing portion 52 to form a housing 5 with the receiving space 53. Of course, the first housing portion 51 and the second housing portion 52 can be various shapes, such as cylinders, cuboids, etc.

[0074] To improve the sealing performance after the first housing part 51 and the second housing part 52 are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 51 and the second housing part 52.

[0075] Assuming that the first box part 51 covers the top of the second box part 52, the first box part 51 can also be called the upper box cover, and the second box part 52 can also be called the lower box.

[0076] In battery 2, there can be one or more battery cells 7. If there are multiple battery cells 7, they can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery cells 7 are connected in both series and parallel. Multiple battery cells 7 can be directly connected in series, in parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 7 is housed in the housing 5. Alternatively, multiple battery cells can first be connected in series, in parallel, or in a mixed manner to form a battery module, and then multiple battery modules can be connected in series, in parallel, or in a mixed manner to form a whole assembly, which is then housed in the housing 5.

[0077] In some embodiments, the battery 2 further includes a metal component 6, which may be a functional component within the battery, a heat exchange assembly, etc. The metal component 6 includes a casing made of metal material, possessing a certain structural strength and electrical conductivity.

[0078] For example, the battery cell 7 may be the smallest unit that makes up the battery 2.

[0079] Figure 3 is an exploded schematic diagram of a battery cell provided in some embodiments of this application.

[0080] As shown in Figure 3, in some embodiments, the battery cell 7 includes a housing 40 and an electrode assembly 10 housed within the housing 40.

[0081] The electrode assembly 10 includes a positive electrode and a negative electrode. During the charging and discharging process of the battery cell 7, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. Optionally, the electrode assembly 10 also includes a separator disposed between the positive and negative electrodes, which can reduce the risk of short circuit between the positive and negative electrodes while allowing active ions to pass through.

[0082] The housing 40 is used to encapsulate the electrode assembly 10 and electrolyte components. The housing 40 can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite housing 40), or aluminum-plastic film, etc.

[0083] In some embodiments, the housing 40 includes a housing 20 and an end cap 30, the housing 20 having an opening and the end cap 30 for closing the opening.

[0084] The housing 20 is a component used to fit the end cap 30 to form the internal cavity of the battery cell 7. The formed internal cavity can be used to accommodate the electrode assembly 10, electrolyte, and other components.

[0085] The housing 20 and the end cap 30 can be separate components. For example, an opening can be provided on the housing 20, and the end cap 30 can be used to close the opening to form an internal cavity for the battery cell 7.

[0086] The end cap 30 is connected to the housing 20 by welding, bonding, snap-fitting or other means.

[0087] In some embodiments, the battery cell 7 further includes an electrolyte contained within the casing 40. The electrolyte acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid.

[0088] In some embodiments, the battery cell 7 includes electrode terminals. The electrode terminals are electrically connected to the electrode assembly 10 for outputting or inputting electrical energy into the battery cell 7.

[0089] In battery 2, a metal component 6 is typically located between the battery cell 7 and the casing 5, with the metal component 6 facing the battery cell 7. The inventors noted that if the internal pressure or temperature of the battery cell 7 exceeds a threshold, the internal substances need to be released promptly to reduce the internal temperature and pressure of the battery cell, thereby reducing the risk of combustion or explosion of the battery cell 7. After the first outer wall of the battery cell 7 is torn open, the ruptured portion overlaps with the metal component 6, forming a conductive connection. This conductive connection causes a short circuit between the metal component 6 and the battery cell 7, endangering the safety of the casing 5.

[0090] To address the aforementioned problems, embodiments of this application provide a battery with a weak point on each battery cell. This weak point guides the battery cell to tear, thereby expelling internal materials, reducing internal temperature and pressure, lowering the risk of explosion or combustion, improving operational reliability, and minimizing damage to surrounding components or personnel. Furthermore, a first insulating protective layer is formed on at least a portion of the weak point's surface to provide insulation, reducing the risk of short circuits due to electrical conduction between the weak point and metal components after tearing, thus improving battery operational stability.

[0091] The battery provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings. Please refer to Figures 2 to 5. Figure 2 is an exploded view of a battery provided in an embodiment of this application. Figure 3 is a structural schematic diagram of a battery cell provided in an embodiment of this application. Figure 4 is a partial structural schematic diagram of a battery cell and metal components provided in an embodiment of this application. Figure 5 is a structural schematic diagram of a weak part provided in an embodiment of this application.

[0092] As shown in the figure, the battery 2 provided in the embodiment of this application includes a battery cell 7 and a metal component 6. The battery cell 7 includes a first outer wall surface 701, and the first outer wall surface 701 has a weak portion 702. The metal component 6 is disposed opposite to the first outer wall surface 701. The first outer wall surface 701 is provided with a first insulating protective layer 703, which is connected to the first outer wall surface 701. Furthermore, the first insulating protective layer 703 covers at least a portion of the weak portion 702.

[0093] The metal component 6 can be a functional component with a specific function located inside the housing 5. For example, the metal component 6 can be a human management component, the bottom protective plate of the housing 5, etc. The first outer wall surface 701 of the battery cell 7 can be the surface of the outer casing 40 that faces away from the receiving cavity. The first insulating protective layer 703 is made of a material with certain insulation and heat resistance properties, used to increase the creepage distance between the first outer wall surface 701 and the metal component 6, and improve the insulation performance.

[0094] The weak part 702 refers to a structure formed on the outer casing 40 of the battery cell 7 with lower strength than other parts of the outer casing 40. For example, the weak part 702 can be a groove recessed along the surface of the outer casing 40. The thickness of the metal structure of the outer casing 40 at the groove is less than the thickness of the structure of other parts of the outer casing 40, so its strength is lower and it is easy to tear.

[0095] For example, the battery cell 7 includes a pressure relief mechanism. The outer casing 40 of the battery cell 7 has a pressure relief hole, and a pressure relief plate is provided on the pressure relief hole. The pressure relief plate has a weak portion 702. The weak portion 702 is torn to connect the inside of the battery cell 7 with the outside, so as to release the internal material. The weak portion 702 on the pressure relief plate can be a plurality of through holes 604 arranged at intervals along a preset path, or a groove formed by recesses along the surface of the pressure relief plate, etc.

[0096] The emissions from battery cell 7 mentioned in this application include: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0097] In the technical solution of this application, by providing a weak portion 702, the battery cell 7 can be torn apart from the weak portion 702, thereby expelling the material inside the battery cell 7, reducing the internal temperature and air pressure of the battery cell 7, reducing the risk of the battery cell 7 exploding or burning, improving the reliability of the battery cell 7 during operation, and reducing the damage caused by the battery cell 7 to surrounding components or personnel. Furthermore, a first insulating protective layer 703 is provided on at least a portion of the surface of the weak portion 702 to form an insulating protection, reducing the risk of short circuits caused by the weak portion 702 contacting the metal component 6 after tearing, and improving the operational stability of the battery 2.

[0098] In some embodiments of this application, the battery cell 7 further includes a first inner wall surface 705 that is opposite to the first outer wall surface 701 along the wall thickness direction. The first inner wall surface 705 is provided with a second insulating protective layer 704, which covers at least a portion of the area on the first inner wall surface 705 that corresponds to the weak portion 702 along the wall thickness direction.

[0099] In the above structure, the first insulating protective layer 703 is located on the first outer wall surface 701, mainly preventing the weak part 702 from directly contacting the metal component 6 in the external environment after tearing. The second insulating protective layer 704 is located on the first inner wall surface 705, corresponding to the weak part 702 in the wall thickness direction, further preventing the interior of the battery cell 7 (such as electrolyte or other conductive materials) from directly contacting the metal component 6 after the weak part 702 is torn, thus forming a double insulating protection mechanism. By providing insulating protective layers on the first outer wall surface 701 and the first inner wall surface 705 respectively, the overall reliability of the battery 2 is improved.

[0100] In some embodiments of this application, the first insulating protective layer 703 includes a polyimide layer, and / or the second insulating protective layer 704 includes a polyimide layer.

[0101] The aforementioned structure, firstly, demonstrates the excellent insulating properties of polyimide, effectively isolating current and increasing the creepage distance between the battery cell 7 and the metal component 6 under specific conditions (such as tearing of the weak point 702), thereby reducing the risk of short circuits. Secondly, the battery 2 generates a large amount of heat during charging and discharging, and the high heat resistance of polyimide allows it to maintain stable performance at high temperatures, making it less prone to decomposition or deformation. This reduces the risk of failure of the first insulating protective layer 703 and / or the second insulating protective layer 704 at high temperatures, ensuring the safe operation of the battery 2. Polyimide also possesses good mechanical strength and toughness, providing some support when the internal pressure of the battery cell 7 is abnormal, preventing excessive deformation or cracking of the weak point 702. Polyimide exhibits excellent resistance to various chemical substances, meaning it has good corrosion resistance and is not easily corroded by electrolytes or other internal substances of the battery 2, thus extending the service life of the first insulating protective layer 703 and the second insulating protective layer 704.

[0102] As shown in Figures 4 and 5, in some embodiments of this application, the weak portion 702 includes a first weak portion 706 and a second weak portion 707 disposed on the first outer wall surface 701 and intersecting each other. The first weak portion 706 and the second weak portion 707 intersect to form a first intersecting portion. The first end of the first weak portion 706 and the second end of the second weak portion 707 are both spaced apart from the first intersecting portion. The line connecting the first end and the second end is a first connecting line. The first weak portion 706, the second weak portion 707, and the first connecting line together define a first folding area 708. A first insulating protective layer 703 covers and connects at least a portion of the first folding area 708 on the first outer wall surface 701. Optionally, the first insulating protective layer 703 completely covers the first folding area 708.

[0103] In the above structure, the first intersection portion formed by the intersection of the first weak portion 706 and the second weak portion 707, along with their respective first and second ends spaced apart from the intersection portion, collectively define a folding region. This allows the battery cell 7 to more easily tear along the first folding region 708 when the internal pressure increases, thereby rapidly releasing the high-pressure gas and high-temperature substances inside. The curved shape of the bend provides a more natural tearing path, contributing to a smoother and more efficient venting process. By timely venting the substances inside the battery cell 7, the internal temperature and pressure of the battery 2 can be effectively reduced, preventing the risk of explosion or combustion due to excessive pressure. This improves the operational reliability of the battery cell 7 under extreme conditions and ensures the overall safety of the battery 2 system.

[0104] Furthermore, the first insulating protective layer 703 covers and connects at least part of the first folded area 708. Even if the folded area is torn, the insulating protective layer can continue to perform its insulating function, preventing the torn part from directly contacting the metal part 6, thereby greatly reducing the risk of short circuit and enhancing the stability of battery 2 operation.

[0105] In some embodiments of this application, the battery cell 7 further includes a first inner wall surface 705 opposite to the first outer wall surface 701 along the wall thickness direction. The first inner wall surface 705 is provided with a second insulating protective layer 704, which covers at least a portion of the area on the first inner wall surface 705 corresponding to the first folded area 708 along the wall thickness direction. Optionally, the second insulating protective layer 704 completely covers the first folded area 708.

[0106] When the battery cell 7 tears due to abnormal pressure or other reasons, the first folding area 708 serves as the primary discharge channel. However, during this process, some electrolyte or other conductive liquid may remain on the first inner wall surface 705. If this liquid comes into direct contact with the metal component 6, it may become electrically conductive, causing a short circuit. By specifically covering the area corresponding to the first folding area 708 in the second insulating protective layer 704, this situation can be effectively prevented, further reducing the risk of short circuits. The dual protection mechanism of the first insulating protective layer 703 and the second insulating protective layer 704 ensures that the battery cell 7 receives adequate insulation protection on both the inner and outer walls of the casing 40, improving not only the safety of the battery 2 but also enhancing its operational stability in complex environments.

[0107] In some embodiments of this application, the weak portion 702 further includes a third weak portion 709, which intersects with the second weak portion 707 to form a second intersection portion. The first weak portion 706 and the third weak portion 709 are spaced apart. A third end portion located on the third weak portion 709 is spaced apart from the second intersection portion. The line connecting the third end portion and the first end portion is a second connecting line. The first weak portion 706, the second weak portion 707, the third weak portion 709, and the second connecting line together define a second folded area 710. A first insulating protective layer 703 covers and connects to at least a portion of the second folded area 710 on the second outer wall surface. Optionally, the first insulating protective layer 703 completely covers the second folded area 710.

[0108] In the aforementioned structure, by providing a first weak point 706, a second weak point 707, and a third weak point 709, the battery cell 7 has multiple discharge paths when internal pressure increases. This allows for simultaneous discharge of internal substances from multiple locations, increasing the discharge rate and reducing the instantaneous temperature rise of the battery cell 7. This helps to rapidly reduce the internal temperature and pressure of the battery 2, preventing dangerous situations caused by excessive pressure. Specifically, the second intersection formed by the intersection of the third weak point 709 and the second weak point 707, along with their interaction with the first weak point 706 and the second connecting line, defines the second folding region 710. This region allows for easier folding and tearing when the internal pressure of the battery cell 7 is abnormal, thus releasing internal pressure more effectively. Simultaneously, the curved shape of the fold makes the tearing process smoother, reducing the fragments and sparks that may be generated during tearing.

[0109] Furthermore, the first insulating protective layer 703 not only covers the first folded area 708, but also covers at least part of the second folded area 710. This comprehensive coverage ensures that even if the second folded area 710 is torn, the second insulating protective layer 704 can continue to perform its insulating function, reducing direct contact between the torn outer casing 40 and the metal component 6, thereby reducing the risk of short circuit and improving the operational stability of the battery 2.

[0110] In some embodiments of this application, the battery cell 7 further includes a first inner wall surface 705 opposite to the first outer wall surface 701 along the wall thickness direction. The first inner wall surface 705 is provided with a second insulating protective layer 704, which covers at least a portion of the area on the first inner wall surface 705 corresponding to the second folded area 710 along the wall thickness direction. Optionally, the second insulating protective layer 704 completely covers the second folded area 710.

[0111] When the battery cell 7 tears due to abnormal pressure or other reasons, the second folded area 710 may become one of the main discharge channels. However, during this process, some electrolyte or other conductive liquids may remain inside the battery 2. If these liquids penetrate the first inner wall surface 705 and come into contact with the metal component 6, a short circuit may occur. By providing a second insulating protective layer 704 on the first inner wall surface 705, and specifically covering the area corresponding to the second folded area 710, this situation can be effectively prevented, thereby reducing the risk of a short circuit. The dual protection mechanism of the first insulating protective layer 703 and the second insulating protective layer 704 ensures that the battery cell 7 is adequately insulated on both the inner and outer walls, which not only improves the safety of the battery 2 but also enhances its operational stability in complex environments. Even if the outer insulation layer is damaged, the inner insulation layer can continue to function, providing additional safety for the battery 2.

[0112] As shown in Figures 4 and 6, in some embodiments of this application, the weak portion 702 includes an arc-shaped weak portion 711, which includes a starting end and a terminating end. The line connecting the starting end and the terminating end is a third connecting line. The arc-shaped weak portion 711 and the third connecting line together define a third folded region 712. A first insulating protective layer 703 covers and connects to at least a portion of the third folded region 712 on the first outer wall surface 701. Optionally, the first insulating protective layer 703 completely covers the third folded region 712.

[0113] In the aforementioned structure, the arc-shaped weak point 711 allows the battery cell 7 to tear along an arc-shaped path when internal pressure increases. Compared to the straight or zigzag weak point 702, the arc-shaped weak point 711 better adapts to the internal pressure distribution of the battery cell 7, making the venting process smoother and more efficient. Simultaneously, the arc-shaped path reduces the amount of debris and sparks that may be generated during the tearing process, further reducing safety hazards. By timely venting the substances inside the battery cell 7, the arc-shaped weak point 711 reduces the risk of explosion or combustion caused by excessive pressure inside the battery 2. This protects the battery cell 7 and also prevents damage to surrounding equipment or the environment caused by battery 2 malfunction, improving the overall operational reliability of the battery 2 system.

[0114] The first insulating protective layer 703 covers the third folded area 712, ensuring that even if the battery cell 7 is torn, the insulating protective layer continues to perform its insulating function, preventing the torn area from directly contacting the metal component 6 and causing a short circuit. This insulation protection reduces the risk of short circuit in the battery 2 and improves the operational stability of the battery 2.

[0115] In some embodiments of this application, the battery cell 7 further includes a first inner wall surface 705 opposite to the first outer wall surface 701 along the wall thickness direction. The first inner wall surface 705 is provided with a second insulating protective layer 704, which covers at least a portion of the area on the first inner wall surface 705 corresponding to the third folded region 712 along the wall thickness direction. Optionally, the second insulating protective layer 704 completely covers the third folded region 712.

[0116] In the above structure, when the battery cell 7 tears due to abnormal pressure or other reasons, the third folding area 712 may become one of the main discharge channels. However, during the tearing process, some electrolyte or other conductive liquids may remain inside the battery 2. If these liquids penetrate the first inner wall surface 705 and come into contact with the metal component 6, they may cause a short circuit. By providing a second insulating protective layer 704 on the first inner wall surface 705, and specifically covering the area corresponding to the third folding area 712, an effective insulating barrier can be formed to prevent the residual liquid from directly contacting the metal component 6, thereby reducing the risk of internal short circuits. The dual protection mechanism of the first insulating protective layer 703 and the second insulating protective layer 704 not only covers the potential short circuit points on the outside of the battery cell 7, but also penetrates deep into the inside of the battery 2, providing insulation protection for critical areas. This design enables the battery 2 to maintain high operational stability when facing various potential short circuit risks.

[0117] As shown in Figures 4 and 7, in some embodiments of this application, the weak portion 702 includes an annular weak portion 713, which defines a fourth folded region 714. A first insulating protective layer 703 covers and connects to at least a portion of the fourth folded region 714 on the first outer wall surface 701. Optionally, the first insulating protective layer 703 completely covers the fourth folded region 714.

[0118] In the aforementioned structure, the annular weak point 713 allows the battery cell 7 to tear along the annular path when internal pressure increases. This design fully utilizes the characteristics of the annular structure, making the discharge process more uniform and controllable. The tearing along the annular path can more effectively disperse pressure, reducing the fragments and sparks that may be generated during the tearing process, thereby reducing safety hazards. Furthermore, the battery cell 7 can respond quickly to abnormal internal pressure, promptly releasing internal materials, reducing the risk of explosion or combustion caused by excessive pressure inside the battery 2, thus protecting the safety of the battery cell 7 itself and its surrounding equipment, and improving the operational reliability of the battery cell 7.

[0119] The first insulating protective layer 703 covering the fourth folded area 714 provides additional insulation protection for the battery cell 7. Even after the annular weak point 713 tears, the insulating protective layer continues to function, preventing direct contact between the torn area and the metal component 6, which could lead to a short circuit. This design reduces the risk of short circuits and improves the operational stability of the battery 2.

[0120] In some embodiments of this application, the battery cell 7 further includes a first inner wall surface 705 opposite to the first outer wall surface 701 along the wall thickness direction. The first inner wall surface 705 is provided with a second insulating protective layer 704, which covers at least a portion of the area on the first inner wall surface 705 corresponding to the fourth folded region 714 along the wall thickness direction. Optionally, the second insulating protective layer 704 completely covers the fourth folded region 714.

[0121] In the above structure, when the battery cell 7 tears due to abnormal internal pressure or other reasons, especially when the annular weak portion 713 tears to form the fourth fold region 714, some electrolyte or other conductive liquid may remain inside the battery 2. If this liquid remains on the first inner wall surface 705 and comes into contact with the metal component 6, it may cause a short circuit. By providing a second insulating protective layer 704 on the first inner wall surface 705 and covering the area corresponding to the fourth fold region 714, direct contact between the residual liquid and the metal component 6 can be effectively prevented, reducing the risk of short circuit. The external first insulating protective layer 703 and the internal second insulating protective layer 704 together constitute a comprehensive insulation protection system. This system not only covers the potential short circuit points on the outside of the battery cell 7 but also extends deep into the interior of the battery 2, providing double protection for critical areas.

[0122] In some embodiments of this application, the conductivity of the first insulating protective layer 703 is 5 × 10⁻⁶. -11 μS / cm~1×10 -10 μS / cm. The above structure, by limiting the conductivity of the first insulating protective layer 703, improves the insulation performance of the first insulating protective layer 703, reduces the risk of short circuit in the first insulating protective layer 703, and improves the operational reliability of the battery cell 7.

[0123] In some embodiments of this application, the melting point of the first insulating protective layer 703 is greater than or equal to 400°C. By limiting the melting point of the first insulating protective layer 703, the heat resistance of the first insulating protective layer 703 is improved, the risk of the first insulating protective layer 703 decomposing at high temperatures or falling off the first wall surface is reduced, and the reliability of the battery 2 operation is improved.

[0124] In some embodiments of this application, the first insulating protective layer 703 is a coating, or the first insulating protective layer 703 is bonded to the first outer wall surface 701 by adhesive. The above structures improve the structural strength of the connection between the first insulating protective layer 703 and the first outer wall surface 701, reduce the risk of the first insulating protective layer 703 detaching, and improve the insulation effect.

[0125] As shown in Figure 8, in some embodiments of this application, the first outer wall surface 701 is provided with a protrusion 715 and / or a recess 716, and the first insulating protective layer 703 covers the protrusion 715 and / or the recess 716 on the first outer wall surface 701. In the above structure, the area of ​​the first surface can be increased, the structural strength of the connection between the first insulating layer and the pressure relief part can be enhanced, the risk of the first insulating layer being damaged can be reduced, and the insulation performance can be improved.

[0126] In some embodiments of this application, the metal component 6 is a thermal management component, which includes a metal housing 40 and a receiving cavity for containing heat exchange fluid. The above structure reduces the risk of a short circuit between the weak point 702 of the battery cell 7 and the heat exchange assembly after the weak point is torn open, thus improving the stability of the heat exchange process of the battery 2 and the overall operational stability of the battery cell 7.

[0127] As shown in FIG9, in some embodiments of this application, the metal component 6 is provided with a clearance structure 601, which is disposed opposite to the weak portion 702 along a first direction. For example, the clearance structure 601 may be formed by recessing the surface of the metal component 6 toward the weak portion 702.

[0128] In the above structure, the avoidance structure 601 can avoid at least part of the material released by the battery cell 7, thereby reducing the risk of the thermal management component blocking the release of material.

[0129] As shown in Figure 10, in some embodiments of this application, the metal component 6 is provided with a third insulating protective layer 602, at least a portion of which is disposed on the clearance structure 601. Optionally, the third insulating protective layer 602 completely covers the clearance structure 601.

[0130] In the above structure, the third insulating protective layer 602 can separate the battery cell 7 from the thermal management component, reduce the risk of electrical conduction between the thermal management component and the battery cell 7, further reduce the risk of insulation failure, and improve the reliability of battery 2 operation.

[0131] In some embodiments of this application, the avoidance structure 601 includes an avoidance recess disposed on the side of the metal component 6 facing the battery cell 7. The metal component 6 includes an avoidance wall defining the avoidance recess. A projection plane perpendicular to the thickness direction of the metal component 6 is projected along the thickness direction of the metal component 6, and the projection of the weak portion 702 lies within the projection of the avoidance recess. At least a portion of the third insulating protective layer 602 is disposed on the avoidance wall. By providing the avoidance recess, this application can increase the distance between the battery cell 7 and the avoidance wall. The second insulating layer can insulate and isolate the avoidance wall of the avoidance recess from the battery cell 7, and increase the creepage distance and insulation gap between the thermal management component and the battery cell 7, thereby reducing the risk of discharge of the battery cell 7.

[0132] As shown in Figures 11 and 12, in some embodiments of this application, the avoidance structure 601 further includes a through hole 604 penetrating the avoidance wall. The orthographic projection of the weak portion 702 along the thickness direction of the metal component 6 onto the metal component 6 at least partially overlaps with the through hole 604. The wall of the through hole 604 is provided with a fourth insulating protective layer 603. In the above structure, the substances released by the battery cell 7 can pass through the through hole 604, thereby reducing the risk of the thermal management component blocking the release of substances, improving the efficiency of internal pressure release of the battery cell 7, and reducing safety risks. The fourth insulating layer can cover the hole wall surface of the through hole 604, increasing the creepage distance between the hole wall surface and the battery cell 7, thereby reducing the risk of discharge of the battery cell 7 and improving insulation safety performance.

[0133] Embodiments of this application also provide an electrical device including the battery 2 described in the above embodiments, the battery 2 being used to provide electrical energy. A weak point 702 is provided in the battery cell 7, allowing the battery cell 7 to tear, thereby expelling substances from inside the battery cell 7, reducing the internal temperature and pressure of the battery cell 7, reducing the risk of explosion or combustion, improving the reliability of the battery cell 7 during operation, and reducing damage to surrounding components or personnel caused by the battery cell 7. Furthermore, a first insulating protective layer 703 is provided on at least a portion of the surface of the weak point 702 to form insulation protection, reducing the risk of short circuits caused by the weak point 702 contacting the metal component 6 after tearing, and improving the operational stability of the battery 2.

[0134] 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, characterized by, The battery cell comprises: a battery cell comprising a first outer wall surface provided with a weak portion; a metal component disposed opposite to the first outer wall surface; wherein the first outer wall surface is provided with a first insulating protective layer connected to the first outer wall surface, and the first insulating protective layer covers at least part of the weak portion.

2. The battery of claim 1, wherein, The battery cell further comprises a first inner wall surface opposite to the first outer wall surface in the wall thickness direction, and the first inner wall surface is provided with a second insulating protective layer covering at least part of the region on the first inner wall surface corresponding to the weak portion in the wall thickness direction.

3. The battery of claim 2, wherein, The first insulating protective layer comprises a polyimide layer, and / or the second insulating protective layer comprises a polyimide layer.

4. The battery of claim 1, wherein, The weak portion comprises a first weak portion and a second weak portion disposed on the first outer wall surface and intersected, the first weak portion and the second weak portion intersect to form a first intersection portion, the first end portion of the first weak portion and the second end portion of the second weak portion are both spaced apart from the first intersection portion, and the connecting line of the first end portion and the second end portion is a first connecting line, the first weak portion, the second weak portion, and the first connecting line jointly define a first folding region, and the first insulating protective layer covers and connects at least part of the first folding region on the first outer wall surface.

5. The battery of claim 4, wherein, The battery cell further comprises a first inner wall surface opposite to the first outer wall surface in the wall thickness direction, and the first inner wall surface is provided with a second insulating protective layer covering at least part of the region on the first inner wall surface corresponding to the first folding region in the wall thickness direction.

6. The battery of claim 4, wherein, The weak portion further comprises a third weak portion intersecting with the second weak portion to form a second intersection portion, the first weak portion is spaced apart from the third weak portion, a third end portion on the third weak portion is spaced apart from the second intersection portion, a connecting line of the third end portion and the first end portion is a second connecting line, the first weak portion, the second weak portion, the third weak portion, and the second connecting line jointly define a second folding region, and the first insulating protective layer covers and connects at least part of the second folding region on the second outer wall surface.

7. The battery of claim 6, wherein, The battery cell further comprises a first inner wall surface opposite to the first outer wall surface in the wall thickness direction, and the first inner wall surface is provided with a second insulating protective layer covering at least part of the region on the first inner wall surface corresponding to the second folding region in the wall thickness direction.

8. The battery of claim 1, wherein, The weak portion comprises an arc-shaped weak portion, the arc-shaped weak portion comprises a starting end portion and a terminal end portion, a connecting line of the starting end portion and the terminal end portion is a third connecting line, the arc-shaped weak portion and the third connecting line jointly define a third folding region, and the first insulating protective layer covers and connects at least part of the third folding region on the first outer wall surface.

9. The battery of claim 8, wherein, The battery cell further comprises a first inner wall surface opposite to the first outer wall surface along a wall thickness direction, and the first inner wall surface is provided with a second insulation protective layer, and the second insulation protective layer covers at least part of a region on the first inner wall surface corresponding to the third folding region along the wall thickness direction.

10. The battery of claim 1, wherein, The weak portion comprises an annular weak portion, and the annular weak portion defines a fourth folding region, and the first insulation protective layer covers and connects at least part of the fourth folding region on the first outer wall surface.

11. The battery of claim 10, wherein, The battery cell further comprises a first inner wall surface opposite to the first outer wall surface along a wall thickness direction, and the first inner wall surface is provided with a second insulation protective layer, and the second insulation protective layer covers at least part of a region on the first inner wall surface corresponding to the fourth folding region along the wall thickness direction.

12. The battery of any one of claims 1-11, wherein, The first insulating protective layer has an electrical conductivity of 5 x 10 -11 μS / cm to 1 x 10 -10 μS / cm.

13. The battery of any one of claims 1-11, wherein, The melting point of the first insulation protective layer is greater than or equal to 400 DEG C.

14. The battery of any one of claims 1-11, wherein, The first insulation protective layer is a coating, or the first insulation protective layer is connected to the first outer wall surface by adhesive.

15. The battery of any one of claims 1-11, wherein, The first outer wall surface is provided with a protruding portion and / or a recessed portion, and the first insulation protective layer covers the protruding portion and / or the recessed portion on the first outer wall surface.

16. The battery of any one of claims 1-11, wherein, The metal component is a heat management component, and the heat management component comprises a metal shell and a containing cavity for containing heat exchange liquid.

17. The battery of claim 16, wherein, The metal component is provided with a relief structure, and the relief structure is arranged opposite to the weak portion along the first direction.

18. The battery of claim 17, wherein, The metal component is provided with a third insulation protective layer, and at least part of the third insulation protective layer is arranged on the relief structure.

19. The battery of claim 18, wherein, The relief structure comprises a relief recess arranged on a side of the metal component facing the battery cell, and the metal component comprises a relief wall for defining the relief recess; in a projection plane perpendicular to a thickness direction of the metal component, a projection of the weak portion along the thickness direction of the metal component is located within a projection of the relief recess. At least part of the third insulation protective layer is arranged on the relief wall.

20. The battery of claim 19, wherein, The relief structure further comprises a through hole penetrating through the relief wall, and a normal projection of the weak portion on the metal component along the thickness direction of the metal component at least partially overlaps with the through hole, and a fourth insulation protective layer is arranged on a hole wall of the through hole.

21. An electrical device, comprising: The electric device comprises the battery as claimed in any one of claims 1-20, and the battery is used for providing electric energy.

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