Battery and electric device

Abstract

The utility model discloses a battery and a power utilization device, the battery comprises a battery monomer and a metal part, the battery monomer comprises a first outer wall surface, and the first outer wall surface is provided with a weak part. The metal part and the first outer wall face are oppositely arranged. Wherein the first outer wall surface is provided with a first insulation protection layer, and the first insulation protection layer is connected to the first outer wall surface. And the first insulating protection layer covers at least part of the weak part. By arranging the weak part, the battery monomer can be torn from the weak part, so that substances in the battery monomer are discharged, the temperature and air pressure in the battery monomer are reduced, and the reliability of the battery monomer in the operation process is improved. Moreover, the first insulation protection layer is arranged on at least part of the surface of the weak part to form insulation protection, so that the risk of short circuit caused by lap joint of the weak part and the metal part after tearing is reduced, and the stability of battery operation is improved.

Description

Technical Field

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

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

[0003] Currently, how to provide the reliability of battery operation is a research direction in battery technology. Summary of the Utility Model

[0004] The present application provides a battery and an electrical device, which can improve the reliability of battery operation.

[0005] In a first aspect, the present application provides a battery, including a battery cell and a metal component. The battery cell includes a first outer wall surface, and a weak part is provided on the first outer wall surface. The metal component is disposed opposite to the first outer wall surface. Wherein, a first insulating protective layer is provided on the first outer wall surface, and the first insulating protective layer is connected to the first outer wall surface. And, the first insulating protective layer covers at least part of the weak part.

[0006] In the technical solution of the present application, by providing the weak part, the battery cell can be torn from the weak part, so as to discharge the substances inside the battery cell, reduce the temperature and air pressure inside the battery cell, reduce the risk of explosion or combustion of the battery cell, improve the reliability during the operation of the battery cell, and reduce the damage to surrounding components or personnel caused by the battery cell. And, an insulating protection is formed by providing a first insulating protective layer on at least part of the surface of the weak part, reducing the risk of short circuit caused by the overlap of the torn weak part and the metal component, and improving the stability of battery operation.

[0007] 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, and a second insulating protective layer is provided on the first inner wall surface, and the second insulating protective layer covers at least part of the area on the first inner wall surface corresponding to the weak part along the wall thickness direction.

[0008] In the above structure, by providing the second protective layer on the first inner wall surface of the battery cell, the risk of short circuit caused by the overlap of the torn weak part and the metal component is further reduced, and the stability of battery operation is improved.

[0009] In some embodiments, the first insulating protective layer includes a polyimide layer, and / or the second insulating protective layer includes a polyimide layer. Polyimide has good insulation and heat resistance, which can form good protection for the first outer wall surface and the first inner wall surface of the battery cell, reduce the risk of short circuit caused by the overlap of the first outer wall surface and / or the first inner wall surface with metal components, and at the same time maintain good performance during the operation of the battery cell, reducing the risk of decomposition of the first insulating protective layer and / or the second insulating protective layer at high temperature or detachment from the battery cell.

[0010] In some embodiments, the weak part includes a first weak part and a second weak part which are arranged on the first outer wall surface and intersect with each other. The first weak part and the second weak part intersect to form a first intersection part. The first end part of the first weak part and the second end part of the second weak part are both spaced from the first intersection part. The connection line of the first end part and the second end part is the first connection line. The first weak part, the second weak part and the first connection line jointly define a first folding area. The first insulating protective layer covers and connects at least part of the first folding area on the first outer wall surface.

[0011] In the above structure, by setting the first weak part and the second weak part to intersect, a bent curve can be formed to facilitate the tearing of the first outer wall surface along it, timely discharge the substances inside the battery cell, and improve the reliability of the battery cell operation. Covering at least part of the first folding area with the first insulating protective layer can reduce the risk of short circuit caused by the overlap of the first folding area with metal components, so as to improve the stability of battery operation.

[0012] 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. A second insulating protective layer is arranged on the first inner wall surface. The second insulating protective layer covers at least part of the area on the first inner wall surface corresponding to the first folding area along the wall thickness direction. In the above structure, by setting the second insulating protective layer, insulation protection is formed in the first folding area of the first inner wall surface of the battery cell, reducing the risk of short circuit caused by the overlap of the remaining liquid on the first inner wall surface of the battery cell with metal components, and improving the stability of battery operation.

[0013] In some embodiments, the weak part further includes a third weak part. The third weak part intersects with the second weak part to form a second intersection part. The first weak part is spaced from the third weak part. The third end part located on the third weak part is spaced from the second intersection part. The connection line of the third end part and the first end part is the second connection line. The first weak part, the second weak part, the third weak part and the second connection line jointly define a second folding area. The first insulating protective layer covers and connects at least part of the second folding area on the first outer wall surface.

[0014] In the above structure, by setting the third weak part to intersect with the second weak part, a bent curve can be formed to facilitate the tearing of the first outer wall surface along it, timely discharge the substances inside the battery cell, and improve the reliability of the battery cell operation. Covering at least part of the second folding area with the first insulating protective layer can reduce the risk of short circuit caused by the overlap of the second folding area and metal components, so as to improve the stability of battery operation.

[0015] 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, and the second insulating protective layer covers at least part of the area on the first inner wall surface corresponding to the second folding area along the wall thickness direction. In the above structure, by setting the second insulating protective layer, an insulating protection is formed in the second folding area of the first inner wall surface of the battery cell, reducing the risk of short circuit caused by the overlap of the remaining liquid on the first inner wall surface of the battery cell and metal components, and improving the stability of battery operation.

[0016] In some embodiments, the weak part includes an arc-shaped weak part. The arc-shaped weak part includes a starting end part and a terminating end part. The connection line between the starting end part and the terminating end part is the third connection line. The arc-shaped weak part and the third connection line jointly define a third folding area. The first insulating protective layer covers and connects at least part of the third folding area on the first outer wall surface. In the above structure, by setting the arc-shaped weak part, it is convenient for the first outer wall surface of the battery cell to be torn along the arc-shaped path, timely discharge the substances inside the battery cell, and improve the reliability of the battery cell operation. Covering at least part of the third folding area with the first insulating protective layer can reduce the risk of short circuit caused by the overlap of the third folding area and metal components, so as to improve the stability of battery operation.

[0017] 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, and the second insulating protective layer covers at least part of the area on the first inner wall surface corresponding to the third folding area along the wall thickness direction. In the above structure, by setting the second insulating protective layer, an insulating protection is formed in the third folding area of the first inner wall surface of the battery cell, reducing the risk of short circuit caused by the overlap of the remaining liquid on the first inner wall surface of the battery cell and metal components, and improving the stability of battery operation.

[0018] In some embodiments, the weak part includes an annular weak part, the annular weak part defines a fourth folding area, and the first insulating protective layer covers and connects at least part of the fourth folding area on the first outer wall surface. In the above structure, by providing the annular weak part, it is convenient to tear the first outer wall surface of the battery cell along an annular path, timely discharge the substances inside the battery cell, and improve the reliability of the operation of the battery cell. Covering at least part of the fourth folding area with the first insulating protective layer can reduce the risk of short circuit caused by the overlap of the fourth folding area and metal components, so as to improve the stability of battery operation.

[0019] In some embodiments, the battery cell further includes a first inner wall surface opposite to the first outer wall surface in the wall thickness direction. A second insulating protective layer is provided on the first inner wall surface, and the second insulating protective layer covers at least part of the area on the first inner wall surface corresponding to the fourth folding area in the wall thickness direction. In the above structure, by providing the second insulating protective layer, insulation protection is formed in the fourth folding area of the first inner wall surface of the battery cell, reducing the risk of short circuit caused by the overlap of the remaining liquid on the first inner wall surface of the battery cell and metal components, and improving the reliability of battery operation.

[0020] In some embodiments, the conductivity of the first insulating protective layer is 5×10 -11 μS / cm to 1×10 -10 μS / cm. In the above structure, by limiting the conductivity of the first insulating protective layer, the insulation performance of the first insulating protective layer is improved, the risk of short circuit of the first insulating protective layer is reduced, and the reliability of the operation of the battery cell is improved.

[0021] 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 peeling off from the first wall surface of the first insulating protective layer is reduced, and the reliability of battery operation is improved.

[0022] In some embodiments, the first insulating protective layer is a coating, or the first insulating protective layer is adhesively connected to the first outer wall surface. In the above structure, the structural strength of the connection between the first insulating protective layer and the first outer wall surface can be improved, the risk of peeling off of the first insulating protective layer is reduced, and the insulation effect is improved.

[0023] In some embodiments, the first outer wall surface is provided with a protrusion and / or a recess, and the first insulating protective layer covers the protrusion and / or the recess 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 part can be enhanced, the risk of damage to the first insulating layer can be reduced, and the insulation performance can be improved.

[0024] In some embodiments, the metal component is a thermal management component, which includes a metal housing and a receiving cavity for receiving a heat exchange liquid. In the above structure, the risk of short circuit between the torn weak part of the battery cell and the heat exchange component can be reduced, and the stability of the battery heat exchange process and the overall operation of the battery cell can be improved.

[0025] In some embodiments, the metal component is provided with an avoidance structure, which is disposed opposite to the weak part in the wall thickness direction. In the above structure, the avoidance structure can avoid at least part of the substances released by the battery cell, so as to reduce the risk of the thermal management component blocking the release of substances.

[0026] In some embodiments, the metal component is provided with a third insulating protection layer, and at least part of the third insulating protection layer is disposed on the avoidance structure. In the above structure, the third insulating protection layer can separate the battery cell from the thermal management component, reduce the risk of electrical conduction between the thermal management component and the battery cell, further reduce the risk of insulation failure, and improve the reliability of battery operation.

[0027] In some embodiments, the avoidance structure includes an avoidance recess, the avoidance recess is disposed on the side of the metal component facing the battery cell, and the metal component includes an avoidance wall for defining the avoidance recess; in the projection plane perpendicular to the thickness direction of the metal component and projected along the thickness direction of the metal component, the projection of the weak part is located within the projection of the avoidance recess, and at least part of the third insulating protection layer is disposed on the avoidance wall. By providing the avoidance recess in this application, the distance between the battery cell and the avoidance wall can be increased, the second insulating layer can insulate and isolate the avoidance wall of the avoidance recess and the battery cell, and the creepage distance and insulation gap between the thermal management component and the battery cell can be increased, thereby reducing the risk of battery cell discharge.

[0028] In some embodiments, the avoidance structure further includes a through hole penetrating the avoidance wall, at least part of the orthographic projection of the weak part on the metal component along the thickness direction of the metal component overlaps with the through hole, and the inner wall of the through hole is provided with a fourth insulating protection layer. In the above structure, the substances released by the battery cell can pass through the through hole, so as to reduce the risk of the thermal management component blocking the substance discharge, improve the efficiency of the internal pressure release of the battery cell, and reduce the safety risk. The fourth insulating layer can cover the inner wall surface of the through hole, increasing the creepage distance between the inner wall surface and the battery cell, thereby reducing the risk of battery cell discharge and improving the insulation safety performance.

[0029] In a second aspect, the present application provides an electrical device, which includes the battery in the above embodiments, and the battery is used to provide electrical energy.

[0030] The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the content of the specification. And in order to make the above and other objects, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are given below. Brief Description of the Drawings

[0031] The features, advantages and technical effects of the exemplary embodiments of the present application will be described below with reference to the drawings.

[0032] Figure 1 Schematic structural diagram of a vehicle provided for an embodiment of the present application;

[0033] Figure 2 Explosion schematic diagram of a battery provided for an embodiment of the present application;

[0034] Figure 3 Schematic structural diagram of a battery cell provided for an embodiment of the present application;

[0035] Figure 4 Partial structural diagram of a battery cell and a metal component provided for an embodiment of the present application;

[0036] Figure 5 Schematic structural diagram of a weak part provided for an embodiment of the present application;

[0037] Figure 6 Schematic structural diagram of a weak part provided for another embodiment of the present application;

[0038] Figure 7 Schematic structural diagram of a weak part provided for yet another embodiment of the present application;

[0039] Figure 8 Schematic structural diagram of a convex part and a concave part provided for an embodiment of the present application;

[0040] Figure 9 Schematic structural diagram of an avoidance structure provided for an embodiment of the present application;

[0041] Figure 10 Schematic structural diagram of a third insulating protective layer provided for an embodiment of the present application;

[0042] Figure 11 Schematic structural diagram of a fourth insulating protective layer provided for an embodiment of the present application;

[0043] Figure 12 Schematic structural diagram of a through hole provided for an embodiment of the present application.

[0044] Detailed description of the reference numerals:

[0045] 1. Vehicle; 2. Battery; 10. Electrode assembly; 20. Housing; 30. End cap; 40. Outer shell; 3. Controller; 4. Motor; 5. Box body; 51. First box body part; 52. Second box body part; 53. Accommodating space; 6. Metal part; 601. Avoidance structure; 602. Third insulation protection layer; 603. Fourth insulation protection layer; 604. Through hole; 7. Battery cell; 701. First outer wall surface; 702. Weak part; 703. First insulation protection layer; 704. Second insulation protection 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. Ring-shaped weak part; 714. Fourth folding area; 715. Protrusion; 716. Depression. Detailed implementation manners

[0046] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0048] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means more than two unless otherwise specifically defined.

[0049] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0050] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this text, the character " / " generally represents an "or" relationship between the associated objects before and after.

[0051] In the description of the embodiments of the present application, the term "plural" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0052] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the present application.

[0053] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "coupling", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0054] In the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in the present application, the character " / " generally represents an "or" relationship between the associated objects before and after.

[0055] In the embodiments of the present application, the same reference numerals represent the same components. And for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components shown in the drawings of the embodiments of the present application, as well as the overall thickness, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to the present application.

[0056] The term "plural" appearing in the present application refers to two or more (including two).

[0057] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging so as to be used continuously.

[0058] The battery cell can include, but is 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.

[0059] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal-prismatic battery, etc. There is no special limitation in the present application.

[0060] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0061] 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 Figure 2 shown, the multiple battery cells are stacked along the thickness direction to form a battery module.

[0062] In some embodiments, the battery can be a battery pack, which includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0063] In some embodiments, the box body can be a part of the chassis structure of a vehicle. For example, a part of the box body can become at least a part of the floor of the vehicle, or a part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0064] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0065] The battery disclosed in the embodiments of the present application can be used in an electrical device using the battery as a power source or various energy storage systems using the battery as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy and an electric aircraft toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle and a spaceship, etc.

[0066] For the convenience of description, the following embodiments will be described by taking the electrical device as a vehicle as an example.

[0067] Figure 1 Schematic structural diagram of a vehicle provided for some embodiments of the present application.

[0068] As Figure 1 shown, a battery 2 is provided inside the vehicle 1. The battery 2 can be provided at the bottom, head or tail of the vehicle 1. The battery 2 can be used for power supply of the vehicle 1. For example, the battery 2 can be used as the operating power source of the vehicle 1.

[0069] The vehicle 1 may further include a controller 3 and a motor 4. The controller 3 is used to control the battery 2 to supply power to the motor 4. For example, it is used for the working power requirements during the start, navigation and driving of the vehicle 1.

[0070] In some embodiments of the present application, the battery 2 can not only be used as the operating power source of the vehicle 1, but also be used as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0071] Figure 2 Explosion schematic diagram of a battery provided for some embodiments of the present application. As Figure 2 shown, the battery 2 includes a box body 5 and battery cells 7. The battery cells 7 are accommodated in the box body 5.

[0072] The box body 5 is used to accommodate the battery cells 7, and the box body 5 can have various structures. In some embodiments, the box body 5 may include a first box body part 51 and a second box body part 52. The first box body part 51 and the second box body part 52 cover each other, and the first box body part 51 and the second box body part 52 jointly define an accommodation space 53 for accommodating the battery cells. The second box body part 52 can be a hollow structure with one end open, and the first box body part 51 is a plate-like structure. The first box body part 51 covers the open side of the second box body part 52 to form the box body 5 with the accommodation space 53; both the first box body part 51 and the second box body part 52 can also be hollow structures with one side open, and the open side of the first box body part 51 covers the open side of the second box body part 52 to form the box body 5 with the accommodation space 53. Of course, the first box body part 51 and the second box body part 52 can have various shapes, such as a cylinder, a cuboid, etc.

[0073] To improve the sealing performance after the connection between the first box body part 51 and the second box body part 52, a sealing member can also be provided between the first box body part 51 and the second box body part 52, such as sealant, sealing ring, etc.

[0074] Assume that the first box body part 51 covers the top of the second box body part 52. The first box body part 51 can also be called the upper box cover, and the second box body part 52 can also be called the lower box body.

[0075] In battery 2, there may be one or more battery cells 7. If there are multiple battery cells 7, they can be connected in series, parallel, or in a combined series-parallel configuration. A combined series-parallel configuration means that there are both series and parallel connections among the multiple battery cells 7. The multiple battery cells 7 can be directly connected in series, parallel, or in a combined series-parallel configuration and then the whole formed by the multiple battery cells 7 is accommodated in the box body 5. Of course, it is also possible that multiple battery cells are first connected in series, parallel, or in a combined series-parallel configuration to form battery modules, and then multiple battery modules are connected in series, parallel, or in a combined series-parallel configuration to form a whole and are accommodated in the box body 5.

[0076] In some embodiments, battery 2 further includes a metal component 6. The metal component 6 can be a functional component inside the battery, a heat exchange component, etc. The metal component 6 includes a housing made of a metal material and has a certain structural strength and electrical conductivity.

[0077] Exemplarily, the battery cell 7 can be the smallest unit that makes up battery 2.

[0078] Figure 3 It is an explosion schematic diagram of the battery cell provided in some embodiments of the present application.

[0079] As Figure 3 shown, in some embodiments, the battery cell 7 includes a housing 40 and an electrode assembly 10 accommodated in the housing 40.

[0080] 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 (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. Optionally, the electrode assembly 10 further includes a separator disposed between the positive electrode and the negative electrode. The separator can reduce the risk of short circuit between the positive and negative electrodes and at the same time allow the active ions to pass through.

[0081] The housing 40 is used to encapsulate components such as the electrode assembly 10 and the electrolyte. The housing 40 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing 40), or an aluminum plastic film, etc.

[0082] In some embodiments, the housing 40 includes a housing body 20 and an end cap 30. The housing body 20 has an opening, and the end cap 30 is used to cover the opening.

[0083] The housing body 20 is a component used to cooperate with 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, the electrolyte, and other components.

[0084] The housing body 20 and the end cap 30 can be independent components. Exemplarily, an opening can be provided on the housing body 20, and the end cap 30 is covered at the opening to form the internal cavity of the battery cell 7.

[0085] The end cap 30 is connected to the housing 20 by welding, bonding, snap - fitting or other means.

[0086] In some embodiments, the battery cell 7 further includes an electrolyte accommodated within the outer casing 40. The electrolyte functions to conduct ions between the positive and negative electrodes. The electrolyte can be liquid, gel - like or solid.

[0087] 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 of the battery cell 7.

[0088] In the battery 2, the metal component 6 is generally disposed between the battery cell 7 and the housing 5, and the metal component 6 faces the battery cell 7. The inventors noticed that after the internal pressure or temperature of the battery cell 7 exceeds a threshold value, it is necessary to timely discharge the internal substances to reduce the temperature and pressure inside the battery cell, so as to reduce the risk of combustion or explosion of the battery cell 7. After the first outer wall surface of the battery cell 7 is torn, the broken part will overlap with the metal component 6 and form an electrical connection with the metal component 6. After the electrical connection, a short - circuit occurs between the metal component 6 and the battery cell 7, endangering the safety of the housing 5.

[0089] Based on the above problems, embodiments of the present application provide a battery. A weak part is provided on the battery cell to guide the battery cell to tear from the weak part, thereby discharging the substances inside the battery cell, reducing the temperature and air pressure inside the battery cell, reducing the risk of explosion or combustion of the battery cell, improving the reliability during the operation of the battery cell, and reducing the damage to surrounding components or personnel caused by the battery cell. And, a first insulating protective layer is provided on at least part of the surface of the weak part to form insulation protection, reducing the risk of electrical conduction and short - circuit with the metal component after the weak part is torn, and improving the stability of battery operation.

[0090] The following will describe in detail the battery provided by the embodiments of the present application with reference to the drawings. Please refer to Figures 2 to 5 , Figure 2 is an exploded view of the battery provided by an embodiment of the present application. Figure 3 is a structural diagram of the battery cell provided by an embodiment of the present application. Figure 4 is a partial structural diagram of the battery cell and the metal component provided by an embodiment of the present application. Figure 5 is a structural diagram of the weak part provided by an embodiment of the present application.

[0091] As shown in the figure, the battery 2 provided by the embodiment of the present application includes a battery cell 7 and a metal component 6. The battery cell 7 includes a first outer wall surface 701, and a weak part 702 is provided on the first outer wall surface 701. The metal component 6 is disposed opposite to the first outer wall surface 701. Among them, a first insulation protection layer 703 is provided on the first outer wall surface 701, and the first insulation protection layer 703 is connected to the first outer wall surface 701. Moreover, the first insulation protection layer 703 covers at least part of the weak part 702.

[0092] The metal component 6 can be a functional component with a specific function provided inside the box body 5. Exemplarily, the metal component 6 can be a human management component, a bottom protection plate of the box body 5, etc. The first outer wall surface 701 of the battery cell 7 can be the surface of the outer shell 40 facing away from the accommodation cavity. The first insulation protection layer 703 is made of a material with certain insulation performance and heat resistance, and is used to increase the creepage distance between the first outer wall surface 701 and the metal component 6 and improve the insulation performance.

[0093] The weak part 702 refers to a structure formed on the outer shell 40 of the battery cell 7 with a strength lower than other parts of the outer shell 40. Exemplarily, the weak part 702 can be a groove recessed along the surface of the outer shell 40, and the thickness of the metal structure of the outer shell 40 at the groove is smaller than the structure thickness of other parts of the outer shell 40. Therefore, its strength is low and it is easy to tear.

[0094] Exemplarily, the battery cell 7 includes a pressure relief mechanism. There is a pressure relief hole on the outer shell 40 of the battery cell 7, a pressure relief piece is provided on the pressure relief hole, and a weak part 702 is provided on the pressure relief piece. Tearing of the weak part 702 connects the inside and the outside of the battery cell 7 to release the internal substances. The weak part 702 on the pressure relief piece can be a plurality of through holes 604 arranged at intervals along a preset path, or a groove formed by concave inward along the surface of the pressure relief piece, etc.

[0095] The emissions from the battery cell 7 mentioned in the present application include: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gas generated by the reaction, flame, etc.

[0096] In the technical solution of the present application, by providing the weak part 702, the battery cell 7 can be torn from the weak part 702, so as to discharge the substances inside the battery cell 7, reduce the temperature and air pressure inside the battery cell 7, reduce the risk of explosion or combustion of the battery cell 7, improve the reliability during the operation of the battery cell 7, and reduce the damage to surrounding components or personnel caused by the battery cell 7. Moreover, a first insulation protection layer 703 is provided on at least part of the surface of the weak part 702 to form insulation protection, reduce the risk of short circuit caused by the overlap between the torn weak part 702 and the metal component 6, and improve the stability of the operation of the battery 2.

[0097] In some embodiments of the present application, the battery cell 7 further includes a first inner wall surface 705 opposite to the first outer wall surface 701 in the wall thickness direction. A second insulation protection layer 704 is provided on the first inner wall surface 705, and the second insulation protection layer 704 covers at least a part of the area on the first inner wall surface 705 corresponding to the weak part 702 in the wall thickness direction.

[0098] In the above structure, the first insulation protection 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 being torn. The second insulation protection layer 704 is located on the first inner wall surface 705 and corresponds to the weak part 702 in the wall thickness direction, further preventing the internal part of the battery cell 7 (such as electrolyte or other conductive substances) from directly contacting the metal component 6 after the weak part 702 is torn, thus forming a double insulation protection mechanism. By providing insulation protection 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.

[0099] In some embodiments of the present application, the first insulation protection layer 703 includes a polyimide layer, and / or the second insulation protection layer 704 includes a polyimide layer.

[0100] In the above structure, firstly, polyimide has good insulation performance, can effectively isolate current, increase the creepage distance between the battery cell 7 and the metal component 6 under specific conditions (such as when the weak part 702 is torn), thereby reducing the risk of short circuit. Secondly, a large amount of heat is generated during the charge and discharge process of the battery 2, and the high heat resistance of polyimide enables it to maintain stable performance in a high-temperature environment and is not prone to decomposition or deformation. This reduces the risk of the first insulation protection layer 703 and / or the second insulation protection layer 704 failing at high temperatures, ensuring the safe operation of the battery 2. Polyimide also has good mechanical strength and toughness, and can provide a certain supporting role when the internal pressure of the battery cell 7 is abnormal, preventing the weak part 702 from deforming or rupturing excessively. Polyimide has excellent resistance to a variety of chemical substances, that is, it has good corrosion resistance and is not easily eroded by substances inside the battery 2 such as electrolyte, thereby extending the service life of the first insulation protection layer 703 and the second insulation protection layer 704.

[0101] Such as Figure 4 And Figure 5As shown, in some embodiments of the present application, the weak part 702 includes a first weak part 706 and a second weak part 707 which are arranged on the first outer wall surface 701 and intersect with each other. The first weak part 706 and the second weak part 707 intersect to form a first intersection part. The first end of the first weak part 706 and the second end of the second weak part 707 are both spaced from the first intersection part. The connection line of the first end and the second end is the first connection line. The first weak part 706, the second weak part 707 and the first connection line jointly define a first folding area 708. The first insulating protective layer 703 covers and connects at least part 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.

[0102] In the above structure, the first intersection part formed by the intersection of the first weak part 706 and the second weak part 707, and their respective first end and second end spaced from the intersection part jointly define a folding area. When the internal pressure of the battery cell 7 increases, it can be more easily torn along the first folding area 708, so as to quickly release the internal high-pressure gas and high-temperature substances. The bent curve shape provides a more natural tearing path, which helps the smooth and efficient discharge process. By timely discharging the substances inside the battery cell 7, the temperature and air pressure inside the battery 2 can be effectively reduced, and the risk of explosion or combustion caused by excessive pressure can be prevented. This improves the operating reliability of the battery cell 7 under extreme conditions and ensures the overall safety of the battery 2 system.

[0103] Moreover, the first insulating protective layer 703 covers and connects at least part of the first folding area 708. Even in the case of tearing in the folding area, the insulating protective layer can continue to play its insulating role, preventing the torn part from directly contacting the metal component 6, thus greatly reducing the risk of short circuit and enhancing the stability of the operation of the battery 2.

[0104] In some embodiments of the present application, the battery cell 7 further includes a first inner wall surface 705 opposite to the first outer wall surface 701 in the wall thickness direction. The first inner wall surface 705 is provided with a second insulating protective layer 704, and the second insulating protective layer 704 covers at least part of the area corresponding to the first folding area 708 in the wall thickness direction on the first inner wall surface 705. Optionally, the second insulating protective layer 704 completely covers the first folding area 708.

[0105] When the battery cell 7 is torn due to abnormal pressure or other reasons inside, the first folding area 708 is the main discharge channel. However, during this process, a part of the electrolyte or other conductive liquid may remain on the first inner wall surface 705. If these liquids come into direct contact with the metal component 6, it is possible to conduct electricity with the metal component 6 and trigger a short circuit. By specially covering the area corresponding to the first folding area 708 in the second insulation protection layer 704, this situation can be effectively prevented, thereby further reducing the risk of short circuit. The dual protection mechanism of the first insulation protection layer 703 and the second insulation protection layer 704 enables the battery cell 7 to be fully insulated on both the inner and outer wall surfaces of the outer shell 40, which not only improves the safety of the battery 2 but also enhances its operating stability in complex environments.

[0106] In some embodiments of the present application, the weak part 702 further includes a third weak part 709. The third weak part 709 intersects with the second weak part 707 to form a second intersection part. The first weak part 706 is spaced apart from the third weak part 709. The third end part located on the third weak part 709 is spaced apart from the second intersection part. The connection line between the third end part and the first end part is the second connection line. The first weak part 706, the second weak part 707, the third weak part 709, and the second connection line jointly define the second folding area 710. The first insulation protection layer 703 covers and connects at least part of the second folding area 710 on the first outer wall surface. Optionally, the first insulation protection layer 703 completely covers the second folding area 710.

[0107] In the above structure, by setting the first weak part 706, the second weak part 707, and the third weak part 709, the battery cell 7 has multiple discharge paths when the internal pressure rises, and can discharge internal substances simultaneously from multiple places, increasing the discharge speed of internal substances, reducing the instantaneous temperature rise of the battery cell 7, helping to quickly reduce the temperature and pressure inside the battery 2, and preventing dangerous situations caused by excessive pressure. Specifically, the second intersection part formed by the intersection of the third weak part 709 and the second weak part 707, and their combined action with the first weak part 706 and the second connection line define the second folding area 710. This area can be more easily folded and torn when the internal pressure of the battery cell 7 is abnormal, thereby more effectively releasing the internal pressure. At the same time, the bent curve shape makes the tearing process smoother, reducing the fragments and sparks that may be generated during the tearing process.

[0108] Moreover, the first insulating protection layer 703 not only covers the first folding area 708, but also covers at least part of the second folding area 710. This comprehensive covering method ensures that even if a tear occurs in the second folding area 710, the second insulating protection layer 704 can still play its insulating role, reducing the direct contact between the housing 40 and the metal component 6 after the tear, thereby reducing the risk of short circuit and improving the operating stability of the battery 2.

[0109] In some embodiments of the present application, the battery cell 7 further includes a first inner wall surface 705 opposite to the first outer wall surface 701 in the wall thickness direction. The second insulating protection layer 704 is provided on the first inner wall surface 705, and the second insulating protection layer 704 covers at least part of the area corresponding to the second folding area 710 on the first inner wall surface 705 in the wall thickness direction. Optionally, the second insulating protection layer 704 completely covers the second folding area 710.

[0110] When a tear occurs inside the battery cell 7 due to abnormal pressure or other reasons, the second folding area 710 may become one of the main discharge channels. However, during this process, some electrolyte or other conductive liquid may remain inside the battery 2. If these liquids penetrate to the first inner wall surface 705 and come into contact with the metal component 6, a short circuit may be triggered. By providing the second insulating protection layer 704 on the first inner wall surface 705 and specifically covering the area corresponding to the second folding area 710, this situation can be effectively prevented, thereby reducing the risk of short circuit. The dual protection mechanism of the first insulating protection layer 703 and the second insulating protection layer 704 enables the battery cell 7 to be fully insulated and protected on both the inner and outer wall surfaces, not only improving the safety of the battery 2, but also enhancing its operating stability in a complex environment. Even when the external insulating layer is damaged, the internal insulating layer can still play its role and provide additional safety protection for the battery 2.

[0111] As Figure 4 and Figure 6 shown, in some embodiments of the present application, the weak part 702 includes an arc-shaped weak part 711. The arc-shaped weak part 711 includes a starting end and a terminating end. The connection line between the starting end and the terminating end is the third connection line. The arc-shaped weak part 711 and the third connection line jointly define the third folding area 712. The first insulating protection layer 703 covers and connects at least part of the third folding area 712 on the first outer wall surface 701. Optionally, the first insulating protection layer 703 completely covers the third folding area 712.

[0112] In the above structure, by providing the arcuate weak portion 711, the battery cell 7 can be torn along an arcuate path when the internal pressure rises. Compared with a linear or zigzag weak portion 702, the arcuate weak portion 711 can better adapt to the internal pressure distribution of the battery cell 7, making the discharge process smoother and more efficient. At the same time, the arcuate path can also reduce debris and sparks that may be generated during the tearing process, further reducing safety hazards. By promptly discharging the substances inside the battery cell 7, the arcuate weak portion 711 reduces the risk of explosion or combustion inside the battery 2 caused by excessive pressure. It protects the battery cell 7 and also prevents damage to surrounding equipment or the environment caused by a failure of the battery 2, improving the operational reliability of the entire battery 2 system.

[0113] The coverage of the first insulation protection layer 703 on the third folding area 712 enables the insulation protection layer to continue to play its insulation role even when the battery cell 7 is torn, preventing direct contact between the torn area and the metal component 6 and causing a short circuit. This insulation protection reduces the risk of short circuit of the battery 2 and improves the operational stability of the battery 2.

[0114] In some embodiments of the present application, the battery cell 7 further includes a first inner wall surface 705 opposite to the first outer wall surface 701 in the wall thickness direction. The first inner wall surface 705 is provided with a second insulation protection layer 704, and the second insulation protection layer 704 covers at least a part of the area corresponding to the third folding area 712 on the first inner wall surface 705 in the wall thickness direction. Optionally, the second insulation protection layer 704 completely covers the third folding area 712.

[0115] In the above structure, when the battery cell 7 is torn due to abnormal pressure or other reasons inside, 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, a short circuit may be caused. By providing the second insulation protection layer 704 on the first inner wall surface 705 and particularly covering the area corresponding to the third folding area 712, an effective insulation barrier can be formed to prevent direct contact between the remaining liquid and the metal component 6, thereby reducing the risk of internal short circuit. The dual protection mechanism of the first insulation protection layer 703 and the second insulation protection layer 704 not only covers potential external short circuit points of the battery cell 7 but also penetrates deep into the battery 2 to provide insulation protection for key areas. This design enables the battery 2 to maintain a high operational stability when facing various potential short circuit risks.

[0116] Such as Figure 4 And Figure 7As shown, in some embodiments of the present application, the weak part 702 includes an annular weak part 713, the annular weak part 713 defines a fourth folding area 714, and the first insulating protective layer 703 covers and connects at least part of the fourth folding area 714 on the first outer wall surface 701. Optionally, the first insulating protective layer 703 completely covers the fourth folding area 714.

[0117] In the above structure, due to the setting of the annular weak part 713, when the internal pressure of the battery cell 7 increases, it can be torn along an annular path. This design makes full use of the characteristics of the annular structure, making the discharge process more uniform and controllable. The tearing along the annular path can more effectively disperse the pressure, reduce the debris and sparks that may be generated during the tearing process, thereby reducing potential safety hazards. Moreover, when the battery cell 7 faces abnormal internal pressure, it can respond quickly and timely discharge the internal substances, reducing the risk of explosion or combustion inside the battery 2 caused by excessive pressure, thereby protecting the safety of the battery cell 7 itself and its surrounding equipment and improving the operating reliability of the battery cell 7.

[0118] The coverage of the fourth folding area 714 by the first insulating protective layer 703 provides additional insulation protection for the battery cell 7. After the annular weak part 713 is torn, the insulating protective layer can continue to play its role to prevent the torn area from directly contacting the metal part 6 and causing a short circuit. This design reduces the short-circuit risk and improves the stability of the battery 2 operation.

[0119] In some embodiments of the present application, the battery cell 7 further includes a first inner wall surface 705 opposite to the first outer wall surface 701 in the wall thickness direction. The first inner wall surface 705 is provided with a second insulating protective layer 704, and the second insulating protective layer 704 covers at least part of the area corresponding to the fourth folding area 714 on the first inner wall surface 705 in the wall thickness direction. Optionally, the second insulating protective layer 704 completely covers the fourth folding area 714.

[0120] In the above structure, when the battery cell 7 is torn due to abnormal internal pressure or other reasons, especially when the annular weak part 713 is torn to form the fourth folding area 714, there may be some electrolyte or other conductive liquids remaining inside the battery 2. If these liquids remain on the first inner wall surface 705 and contact the metal part 6, a short circuit may be caused. By providing the second insulating protective layer 704 on the first inner wall surface 705 and covering the area corresponding to the fourth folding area 714, the direct contact between the remaining liquid and the metal part 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 form a comprehensive insulation protection system. This system not only covers the external potential short-circuit points of the battery cell 7, but also penetrates deep into the battery 2 to provide double protection for key areas.

[0121] In some embodiments of the present application, the conductivity of the first insulating protection layer 703 is 5×10 -11 μS / cm to 1×10 -10 μS / cm. In the above structure, by limiting the conductivity of the first insulating protection layer 703, the insulation performance of the first insulating protection layer 703 is improved, the risk of short circuit of the first insulating protection layer 703 is reduced, and the reliability of the operation of the battery cell 7 is improved.

[0122] In some embodiments of the present application, the melting point of the first insulating protection layer 703 is greater than or equal to 400 °C. By limiting the melting point of the first insulating protection layer 703, the heat resistance of the first insulating protection layer 703 is improved, the risk of high-temperature decomposition of the first insulating protection layer 703 or detachment from the first wall surface is reduced, and the reliability of the operation of the battery 2 is improved.

[0123] In some embodiments of the present application, the first insulating protection layer 703 is a coating, or the first insulating protection layer 703 is adhesively connected to the first outer wall surface 701. In the above structure, the structural strength of the connection between the first insulating protection layer 703 and the first outer wall surface 701 can be improved, the risk of detachment of the first insulating protection layer 703 is reduced, and the insulation effect is improved.

[0124] As Figure 8 shown, in some embodiments of the present application, the first outer wall surface 701 is provided with a protrusion 715 and / or a recess 716, and the first insulating protection 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 damage to the first insulating layer can be reduced, and the insulation performance can be improved.

[0125] In some embodiments of the present application, the metal component 6 is a thermal management component, and the thermal management component includes a metal shell 40 and a receiving cavity for receiving a heat exchange fluid. In the above structure, the risk of short circuit between the torn weak part 702 of the battery cell 7 and the heat exchange component can be reduced, and the stability of the heat exchange process of the battery 2 and the overall operation stability of the battery cell 7 can be improved.

[0126] As Figure 9 shown, in some embodiments of the present application, the metal component 6 is provided with an avoidance structure 601, and the avoidance structure 601 is disposed opposite to the weak part 702 in the wall thickness direction. Exemplarily, the avoidance structure 601 can be formed by the surface of the metal component 6 facing the weak part 702 being concave.

[0127] In the above structure, the avoidance structure 601 can avoid at least part of the substances discharged by the battery cell 7, so as to reduce the risk of the thermal management component blocking the release of substances.

[0128] As Figure 10 shown, in some embodiments of the present application, the metal component 6 is provided with a third insulating protective layer 602, and at least a part of the third insulating protective layer 602 is disposed on the avoidance structure 601. Optionally, the third insulating protective layer 602 completely covers the avoidance structure 601.

[0129] 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 the battery 2 operation.

[0130] In some embodiments of the present application, the avoidance structure 601 includes an avoidance recess, the avoidance recess is disposed on a side of the metal component 6 facing the battery cell 7, and the metal component 6 includes an avoidance wall for defining the avoidance recess; when projected along the thickness direction of the metal component 6 on a projection plane perpendicular to the thickness direction of the metal component 6, the projection of the weak part 702 is located within the projection of the avoidance recess, and at least a part of the third insulating protective layer 602 is disposed on the avoidance wall. By providing the avoidance recess in the present application, the distance between the battery cell 7 and the avoidance wall can be increased, the second insulating layer can insulate and isolate the avoidance wall of the avoidance recess and the battery cell 7, and the creepage distance and insulation gap between the thermal management component and the battery cell 7 can be increased, thereby reducing the risk of discharge of the battery cell 7.

[0131] As Figure 11 and Figure 12 shown, in some embodiments of the present application, the avoidance structure 601 further includes a through hole 604 penetrating the avoidance wall, at least a part of the orthographic projection of the weak part 702 on the metal component 6 along the thickness direction of the metal component 6 overlaps with the through hole 604, and the inner wall of the through hole 604 is provided with a fourth insulating protective layer 603. In the above structure, the substance discharged by the battery cell 7 can pass through the through hole 604, so as to reduce the risk of the thermal management component blocking the substance discharge, improve the efficiency of internal pressure release of the battery cell 7, and reduce the safety risk. The fourth insulating layer can cover the inner wall surface of the through hole 604, increase the creepage distance between the inner wall surface and the battery cell 7, thereby reducing the risk of discharge of the battery cell 7 and improving the insulation safety performance.

[0132] Embodiments of the present application also provide an electrical device, which includes the battery 2 in the above embodiments. The battery 2 is used to provide electrical energy. A weak part 702 is provided in the battery cell 7. The battery cell 7 can be torn from the weak part 702, so as to discharge the substances inside the battery cell 7, reduce the temperature and air pressure inside the battery cell 7, reduce the risk of explosion or combustion of the battery cell 7, improve the reliability during the operation of the battery cell 7, and reduce the damage to surrounding components or personnel caused by the battery cell 7. Moreover, a first insulating protective layer 703 is provided on at least part of the surface of the weak part 702 to form insulation protection, reduce the risk of short circuit caused by the overlap of the torn weak part 702 and the metal component 6, and improve the stability of the operation of the battery 2.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, characterized in that, Comprising: A battery cell including a first outer wall surface, and a weak portion is provided on the first outer wall surface; A metal component disposed opposite to the first outer wall surface; Wherein, a first insulating protective layer is provided on the first outer wall surface, the first insulating protective layer is connected to the first outer wall surface, and the first insulating protective layer covers at least a part of the weak portion.

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

3. The battery according to claim 2, wherein, The first insulating protective layer includes a polyimide layer, and / or the second insulating protective layer includes a polyimide layer.

4. The battery according to claim 1, characterized in that, The weak portion includes a first weak portion and a second weak portion which are provided on the first outer wall surface and intersect with each other. The first weak portion and the second weak portion intersect to form a first intersection portion. A first end portion of the first weak portion and a second end portion of the second weak portion are both spaced apart from the first intersection portion. A connection line of the first end portion and the second end portion is a first connection line. The first weak portion, the second weak portion and the first connection line jointly define a first folding region, and the first insulating protective layer covers and connects at least a part of the first folding region on the first outer wall surface.

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

6. The battery according to claim 4, characterized in that, The weak portion further includes a third weak portion. The third weak portion intersects 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 connection line of the third end portion and the first end portion is a second connection line. The first weak portion, the second weak portion, the third weak portion and the second connection line jointly define a second folding region, and the first insulating protective layer covers and connects at least a part of the second folding region on the first outer wall surface.

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

8. The battery according to claim 1, characterized in that, The weak portion includes an arc-shaped weak portion. The arc-shaped weak portion includes a starting end portion and a terminating end portion. A connection line of the starting end portion and the terminating end portion is a third connection line. The arc-shaped weak portion and the third connection line jointly define a third folding region, and the first insulating protective layer covers and connects at least a part of the third folding region on the first outer wall surface.

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

10. The battery according to claim 1, characterized in that, The weak part includes an annular weak part that defines a fourth folding area, and the first insulation protection layer covers and connects at least a part of the fourth folding area on the first outer wall surface.

11. The battery according to claim 10, characterized in that, The battery cell further includes a first inner wall surface opposite to the first outer wall surface along the wall thickness direction, and a second insulation protection layer is provided on the first inner wall surface, and the second insulation protection layer covers at least a part of the area on the first inner wall surface corresponding to the fourth folding area along the wall thickness direction.

12. The battery according to any one of claims 1-11, characterized in that, The conductivity of the first insulating protective layer is 5×10 -11 μS / cm to 1×10 -10 μS / cm.

13. The battery according to any one of claims 1-11, characterized in that, The melting point of the first insulation protection layer is greater than or equal to 400 °C.

14. The battery according to any one of claims 1-11, characterized in that, The first insulation protection layer is a coating, or the first insulation protection layer is adhesively connected to the first outer wall surface.

15. The battery according to any one of claims 1-11, characterized in that, The first outer wall surface is provided with a convex part and / or a concave part, and the first insulation protection layer covers the convex part and / or the concave part on the first outer wall surface.

16. The battery according to any one of claims 1-11, characterized in that, The metal component is a heat management component, and the heat management component includes a metal shell and a receiving cavity for receiving a heat exchange liquid.

17. The battery according to claim 2, characterized in that, The metal component is provided with an avoidance structure, and the avoidance structure is arranged opposite to the weak part along the wall thickness direction.

18. The battery according to claim 17, characterized in that, The metal component is provided with a third insulation protection layer, and at least a part of the third insulation protection layer is arranged on the avoidance structure.

19. The battery according to claim 18, characterized in that, The avoidance structure includes an avoidance concave part arranged on the side of the metal component facing the battery cell, and the metal component includes an avoidance wall for defining the avoidance concave part; when projected along the thickness direction of the metal component on a projection plane perpendicular to the thickness direction of the metal component, the projection of the weak part is located within the projection of the avoidance concave part; At least a part of the third insulation protection layer is arranged on the avoidance wall.

20. The battery according to claim 19, characterized in that, The avoidance structure further includes a through hole penetrating the avoidance wall, and at least a part of the orthographic projection of the weak part on the metal component along the thickness direction of the metal component overlaps with the through hole, and a fourth insulation protection layer is provided on the hole wall of the through hole.

21. An electrical device, characterized in that, The electrical device includes the battery according to any one of claims 1-20, and the battery is used to provide electrical energy.

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