Battery and electric device

Abstract

A battery (10) and an electric device. The battery (10) comprises: a battery cell (20), wherein a pressure relief mechanism (213) is provided on a first wall (310) of the battery cell (20); a functional component (320) connected to the first wall (310) and provided with a clearance through hole (321), wherein the clearance through hole (321) is arranged opposite to the pressure relief mechanism (213) and used for providing clearance for a substance discharged by the battery cell (20) via the pressure relief mechanism (213); and an insulating component (330) covering a hole wall surface (3211) of the clearance through hole (321) and provided with a protruding portion (331) protruding out of the hole wall surface (3211), wherein the protruding portion (331) is used for limiting a flip angle of the pressure relief mechanism (213), and the flip angle is the maximum angle at which the pressure relief mechanism (213) rotates after being actuated when thermal runaway occurs in the battery cell (20). According to the battery (10) and the electric device, the probability of battery discharging when thermal runaway occurs in the battery (10) can be reduced, so that the overall performance of the battery (10) is improved.

Description

Battery and power device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202410200458.5, filed on February 22, 2024, entitled “A Battery and Electrical Device,” the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and more specifically, to a battery and an electrical device. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become a crucial component of the industry's sustainable development. Battery technology, in turn, is a crucial factor in the development of electric vehicles.

[0005] However, during the battery's charge and discharge process, the internal temperature rises, potentially leading to problems such as thermal runaway. Thermal runaway can further lead to problems such as battery insulation performance, affecting battery performance and the user experience. Therefore, improving overall battery performance is a pressing issue in battery technology.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a battery and an electrical device that can reduce the probability of discharge after thermal runaway of the battery and improve the overall performance of the battery.

[0008] In a first aspect, a battery is provided, comprising: a battery cell, a pressure relief mechanism being provided on a first wall of the battery cell; a functional component connected to the first wall and provided with an avoidance through-hole, the avoidance through-hole being arranged opposite to the pressure relief mechanism and being used to avoid substances discharged from the battery cell through the pressure relief mechanism; an insulating component covering the hole wall surface of the avoidance through-hole and provided with a protrusion protruding from the hole wall surface, the protrusion being used to limit a flip angle A of the pressure relief mechanism, the flip angle A being the maximum angle of rotation of the pressure relief mechanism after actuation in the event of thermal runaway of the battery cell.

[0009] In the embodiment of the present application, a protrusion protruding from the hole wall is provided on the insulating component, and the protrusion is then used to limit the maximum flipping angle of the pressure relief mechanism. This can reduce the probability of the pressure relief mechanism overlapping with the battery casing after flipping when the flipping angle of the pressure relief mechanism is too large, thereby reducing the probability of discharge between the battery cell and the functional component after the battery cell has thermal runaway, thereby improving the overall performance of the battery.

[0010] In some embodiments, the flipping angle A is an acute angle. Thus, in the embodiments of the present application, by setting the flipping angle A as an acute angle, the probability of the pressure relief mechanism overlapping with the battery housing etc. after flipping can be effectively reduced, thereby reducing the probability of discharge between the battery cell and the functional components after the battery cell undergoes thermal runaway and improving the overall performance of the battery.

[0011] In some embodiments, the range of the flipping angle A is: 30° ≤ A ≤ 80°. Thus, in the embodiments of the present application, by setting the range of the flipping angle A as: 30° ≤ A ≤ 80°, the probability of the pressure relief mechanism overlapping with the battery housing etc. after flipping can be effectively reduced, so as to further reduce the probability of discharge between the battery cell and the functional components after the battery cell undergoes thermal runaway and improve the overall performance of the battery.

[0012] In some embodiments, the battery further includes: a bottom plate disposed on a side of the functional component away from the battery cell, and a cavity formed between the bottom plate and the functional component is used to accommodate substances discharged after the battery cell undergoes thermal runaway; the flipping angle A satisfies the following formula: a×sinA < b, where a represents the flipping length of the pressure relief mechanism, and b represents the distance between the first wall of the battery cell and the bottom plate.

[0013] In the embodiments of the present application, when the flipping angle A of the pressure relief mechanism satisfies the above formula, there is a certain distance between the pressure relief mechanism and the bottom plate after flipping, which can reduce the accumulation of discharged substances while reducing the probability of discharge of the battery cell caused by the overlap of the pressure relief mechanism and the bottom plate, and improve the overall performance of the battery.

[0014] In some embodiments, the flipping angle A satisfies the following formula: b - a×sinA > C, where C represents the minimum electrical clearance between the pressure relief mechanism and the bottom plate.

[0015] In the embodiments of the present application, when the flipping angle A of the pressure relief mechanism satisfies the above formula, the distance between the pressure relief mechanism and the bottom plate after flipping meets the electrical safety standard, further reducing the probability of discharge between the battery cell and the functional components and improving the overall performance of the battery.

[0016] In some embodiments, the protruding portion includes a first inclined surface, the first inclined surface is used to be closely attached to the pressure relief mechanism after the pressure relief mechanism flips, and the angle between the first inclined surface and the x direction is equal to the flipping angle of the pressure relief mechanism, and the x direction is perpendicular to the thickness direction of the pressure relief mechanism.

[0017] In the embodiment of the present application, by setting the first inclined surface to be tightly attached to the pressure relief mechanism after being flipped, the first inclined surface can provide sufficient supporting force for the pressure relief mechanism, reducing the probability of overlap between the pressure relief mechanism and the bottom plate, thereby reducing the probability of discharge between the battery cell and the functional component, and improving the overall performance of the battery.

[0018] In some embodiments, the protrusion includes a curved surface, and the curved surface is used to be tangent to the pressure relief mechanism to limit the flipping angle of the pressure relief mechanism.

[0019] In the embodiment of the present application, when the curved surface included in the protrusion is used to be tangent to the pressure relief mechanism to limit the flipping angle of the pressure relief mechanism, the protrusion on the insulating component is easy to manufacture, thereby improving the preparation efficiency of the insulating component and further improving the production efficiency of the battery.

[0020] In some embodiments, the battery further includes: a connecting component for connecting the functional component and the first wall of the battery cell; and an isolating component filling a gap between the connecting component and the insulating component to isolate the connecting component from the insulating component.

[0021] In the embodiment of the present application, a connecting component is provided to connect the functional components, and an isolation component is filled between the connecting component and the insulating component, so that the discharge discharged from the pressure relief mechanism is not easy to contact the first wall of the battery cell, thereby reducing the probability of discharge between the battery cell and the functional component.

[0022] In some embodiments, the isolation component is made of plastic or rubber.

[0023] In the embodiment of the present application, by setting the material of the isolation component, the probability of electrical connection between the functional component and the battery cell can be reduced, and the risk of discharge between the battery cell and the functional component can be reduced.

[0024] In some embodiments, the insulating component also covers at least a portion of the first surface and at least a portion of the second surface of the functional component, the first surface and the second surface are both connected to the hole wall and arranged opposite to each other, and the first surface is closer to the battery cell than the second surface.

[0025] In the embodiment of the present application, an insulating component is provided to cover a partial area of ​​the two surfaces of the functional component connected to the hole wall, so that the insulating component covers a larger area, and an insulating component is provided between the functional component and the first wall of the battery cell, thereby further reducing the risk of discharge between the battery cell and the functional component and improving the overall performance of the battery.

[0026] In some embodiments, the functional component is a supporting component, which is used to support the battery cell; or, the functional component is a thermal management component, which is used to accommodate a heat exchange medium to perform heat exchange with the battery cell.

[0027] In the embodiment of the present application, by setting the functional component as a supporting component to support the battery cell, or setting the functional component as a thermal management component to accommodate heat exchange medium and perform heat exchange with the battery cell, it is beneficial to improve the overall performance of the battery.

[0028] In some embodiments, the melting point of the insulating component is greater than or equal to 100°C. Thus, in the embodiments of the present application, by setting the melting point of the insulating component to be greater than or equal to 100°C, the insulating component limits the tilting angle of the pressure relief mechanism while reducing the risk of damage to the insulating component by emissions discharged through the pressure relief mechanism, thereby improving the overall performance of the battery. In some embodiments, the insulating component is made of polyimide or polyvinyl fluoride.

[0029] In the embodiment of the present application, by setting the material of the insulating component to polyimide or polyvinyl fluoride, the probability of the insulating component being damaged by high-temperature fluid discharged from the battery cell is reduced, thereby reducing the probability of discharge between the battery cell and the functional component and improving the overall performance of the battery.

[0030] In a second aspect, an electrical device is provided, comprising the battery as described in the first aspect or any embodiment of the first aspect, wherein the battery is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 shows a schematic structural diagram of a vehicle according to an embodiment of the present application.

[0032] FIG2 shows a schematic structural diagram of a battery according to an embodiment of the present application.

[0033] FIG3 shows a schematic structural diagram of a battery cell provided in an embodiment of the present application.

[0034] FIG4 shows a schematic structural diagram of a battery provided in another embodiment of the present application.

[0035] FIG5 shows a schematic cross-sectional view of a battery provided in an embodiment of the present application.

[0036] FIG6 shows a schematic cross-sectional view of a battery provided in another embodiment of the present application.

[0037] FIG7 shows a schematic cross-sectional view of a battery provided in another embodiment of the present application.

[0038] FIG8 shows a schematic cross-sectional view of a battery provided in another embodiment of the present application.

[0039] FIG9 shows a schematic cross-sectional view of a battery provided in another embodiment of the present application.

[0040] FIG10 shows a schematic cross-sectional view of a battery provided in another embodiment of the present application.

[0041] FIG11 shows a schematic cross-sectional view of a battery provided in another embodiment of the present application.

[0042] Explanation of the reference numerals: 1-vehicle; 10-battery; 11-motor; 12-controller; 100-housing; 110-first part of the housing; 120-second part of the housing; 20-battery cell; 214-electrode terminal; 214a-positive electrode terminal; 214b-negative electrode terminal; 212-cover plate; 22-electrode assembly; 23-connecting member; 221a-first pole ear; 222a-second pole ear; 211-housing; 213-pressure relief mechanism; 215-bottom wall of the pressure relief mechanism 213 opposite to the top wall; 310-first wall; 320-functional component; 321-avoidance through hole; 330-insulating component; 3211-hole wall; 3212-first surface; 3213-second surface; 331-protrusion; 3311-first inclined surface; 340-bottom plate; 350-connecting component; 360-isolating component.

[0043] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0044] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0046] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0047] The term "and / or" in this application simply describes an association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0048] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only 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-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0049] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0050] In this application, a battery refers to a physical module that includes one or more battery cells to provide electrical energy. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a housing that encloses one or more battery cells. The housing reduces the possibility of liquids or other foreign matter affecting the charging or discharging of the battery cells.

[0051] Optionally, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., which is not limited in the embodiments of the present application. The battery cell may be cylindrical, flat, rectangular, or in other shapes, etc., which is not limited in the embodiments of the present application. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, which is not limited in the embodiments of the present application.

[0052] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet comprises a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The current collector uncoated with the positive active material layer protrudes from the current collector coated with the positive active material layer, and the current collector uncoated with the positive active material layer serves as the positive electrode tab. For lithium-ion batteries, for example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet comprises a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The current collector uncoated with the negative active material layer protrudes from the current collector coated with the negative active material layer, and the current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, among others. To allow high current to pass without fusing, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. The separator can be made of polypropylene (PP) or polyethylene (PE). In addition, the electrode assembly can be a wound structure or a laminated structure, but the embodiments of the present application are not limited to this.

[0053] The development of battery technology must take into account multiple design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, the safety, stability and other performance of the battery must also be considered.

[0054] When a battery cell experiences thermal runaway, the corresponding pressure relief mechanism flips over to release the high-temperature fluid inside the cell. However, this flipping mechanism could potentially overlap the battery's baseplate, causing the cell to discharge and impacting user experience.

[0055] In view of this, an embodiment of the present application provides a battery, including a battery cell, a functional component, and an insulating component. A pressure relief mechanism is provided on the first wall of the battery cell; the functional component is connected to the first wall and is provided with an avoidance through-hole, which is arranged opposite to the pressure relief mechanism and is used to avoid substances discharged from the battery cell through the pressure relief mechanism; the insulating component covers the hole wall of the avoidance through-hole and is provided with a protrusion protruding from the hole wall, which is used to limit the flipping angle of the pressure relief mechanism. The flipping angle is the maximum angle of rotation after the pressure relief mechanism is actuated in the event of thermal runaway of the battery cell. By providing a protrusion on the insulating component to limit the maximum flipping angle of the pressure relief mechanism, the probability of the pressure relief mechanism overlapping with the battery casing after flipping can be reduced, thereby reducing the probability of discharge between the battery cell and the functional component after thermal runaway of the battery cell, thereby improving the overall efficiency of the battery.

[0056] The technical solutions described in the embodiments of the present application are applicable to various battery-using devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0057] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the devices described above, but can also be applied to all devices using batteries. However, for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0058] For example, as shown in FIG1 , it is a structural diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 11, a controller 12 and a battery 10 may be provided inside the vehicle 1. The controller 12 is used to control the battery 10 to supply power to the motor 11. For example, a battery 10 may be provided at the bottom, front or rear of the vehicle 1. The battery 10 may be used to power the vehicle 1. For example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0059] To meet different power requirements, a battery can include multiple battery cells, which can be connected in series, parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections. A battery can also be referred to as a battery pack. Alternatively, multiple battery cells can be connected in series, parallel, or in a hybrid configuration to form a battery module, which can then be connected in series, parallel, or in a hybrid configuration to form a battery. In other words, multiple battery cells can be directly connected to form a battery, or they can be first connected to form battery modules, which can then be connected to form a battery.

[0060] For example, as shown in FIG2 , which is a structural diagram of a battery 10 according to an embodiment of the present application, the battery 10 may include a plurality of battery cells 20. The battery 10 may further include a housing 100 (or a cover), the interior of the housing 100 being a hollow structure, and the plurality of battery cells 20 being accommodated in the housing 100. As shown in FIG2 , the housing 100 may include two parts, referred to herein as a first housing 110 and a second housing 120, which are snapped together. The shapes of the first housing 110 and the second housing 120 may be determined according to the shapes of the combination of the plurality of battery cells 20, and the first housing 110 and the second housing 120 may both have an opening. For example, the first and second housing portions 110, 120 may each be a hollow cuboid with only one open face. The opening of the first and second housing portions 110, 120 are disposed opposite each other, and the first and second housing portions 110, 120 are engaged with each other to form the housing 100 having a closed chamber. Multiple battery cells 20 are connected in parallel, in series, or in a mixed combination and then placed within the housing 100 formed by the engagement of the first and second housing portions 110, 120.

[0061] Optionally, the battery 10 may also include other structures, which will not be described in detail here. For example, the battery 10 may also include a busbar component, which is used to achieve electrical connection between multiple battery cells 20, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can achieve electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Furthermore, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the box through a conductive mechanism. Optionally, the conductive mechanism may also belong to the busbar component.

[0062] The number of battery cells 20 can be set to any value based on different power requirements. Multiple battery cells 20 can be connected in series, parallel, or in a hybrid manner to achieve higher capacity or power. Since each battery 10 may include a large number of battery cells 20, for ease of installation, the battery cells 20 can be arranged in groups, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in each group of battery cells 20 is not limited and can be set according to requirements.

[0063] FIG3 is a schematic structural diagram of a battery cell 20 according to an embodiment of the present application.

[0064] As shown in FIG3 , the battery cell 20 includes one or more electrode assemblies 22, a housing 211, and a cover plate 212. The walls of the housing 211 and the cover plate 212 are collectively referred to as the walls of the battery cell 20. The housing 211 is shaped according to the shape of the one or more electrode assemblies 22 after assembly. For example, the housing 211 may be a hollow rectangular parallelepiped, a cube, or a cylinder, and one of the faces of the housing 211 may have an opening so that the one or more electrode assemblies 22 can be placed within the housing 211. For example, when the housing 211 is a hollow rectangular parallelepiped or a cube, one of the planes of the housing 211 is an open face, i.e., the plane has no walls, allowing the inside and outside of the housing 211 to communicate. When the housing 211 is a hollow cylinder, the end faces of the housing 211 are open faces, i.e., the end faces have no walls, allowing the inside and outside of the housing 211 to communicate. The cover plate 212 covers the opening and is connected to the housing 211 to form a closed cavity for placing the electrode assemblies 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

[0065] The battery cell 20 may also include two electrode terminals 214, which may be disposed on the cover plate 212. The cover plate 212 is typically flat, with the two electrode terminals 214 secured to the flat surface of the cover plate 212. The two electrode terminals 214 are respectively a positive electrode terminal 214a and a negative electrode terminal 214b. Each electrode terminal 214 is provided with a corresponding connecting member 23, also known as a current collecting member, which is located between the cover plate 212 and the electrode assembly 22 and electrically connects the electrode assembly 22 to the electrode terminals 214.

[0066] As shown in FIG3 , each electrode assembly 22 has a first electrode tab 221a and a second electrode tab 222a. The polarity of the first electrode tab 221a and the second electrode tab 222a are opposite. For example, when the first electrode tab 221a is a positive electrode tab, the second electrode tab 222a is a negative electrode tab. The first electrode tab 221a of one or more electrode assemblies 22 is connected to one electrode terminal via a connecting member 23, and the second electrode tab 222a of one or more electrode assemblies 22 is connected to another electrode terminal via another connecting member 23. For example, the positive electrode terminal 214a is connected to the positive electrode tab via one connecting member 23, and the negative electrode terminal 214b is connected to the negative electrode tab via another connecting member 23.

[0067] In the battery cell 20 , the electrode assembly 22 can be provided as a single one or multiple ones according to actual use requirements. As shown in FIG3 , four independent electrode assemblies 22 are provided in the battery cell 20 .

[0068] As an example, a pressure relief mechanism 213 may be further provided on one wall of the battery cell 20. The pressure relief mechanism 213 is configured to be activated to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold.

[0069] Optionally, in one embodiment of the present application, the pressure relief mechanism 213 and the electrode terminal 214 are disposed on different walls of the battery cell 20. As an example, as shown in FIG3 , the electrode terminal 214 of the battery cell 20 may be disposed on the top wall of the battery cell 20, i.e., the cover plate 212. The pressure relief mechanism 213 is disposed on another wall of the battery cell 20 that is different from the top wall. For example, the pressure relief mechanism 213 is disposed on the bottom wall 215 opposite the top wall. For ease of illustration, the bottom wall 215 is separated from the housing 211 in FIG3 , but this does not limit the bottom side of the housing 211 to having an opening.

[0070] Alternatively, in another embodiment of the present application, the pressure relief mechanism 213 and the electrode terminal 214 are disposed on the same wall of the battery cell 20. For example, the electrode terminal 214 and the pressure relief mechanism 213 can both be disposed on the top wall of the battery cell 20, i.e., the cover plate 212.

[0071] The pressure relief mechanism 213 can be part of the wall in which it is located, or it can be a separate structure from the wall in which it is located, and fixed to the wall in which it is located by, for example, welding. For example, in the embodiment shown in Figure 3, when the pressure relief mechanism 213 is part of the bottom wall 215, the pressure relief mechanism 213 can be formed by providing a notch in the bottom wall 215, and the thickness of the bottom wall 215 corresponding to the notch is less than the thickness of the pressure relief mechanism 213 in other areas except the notch. The notch is the weakest point of the pressure relief mechanism 213. When the battery cell 20 generates too much gas, causing the pressure inside the shell 211 to rise and reach a threshold, or when the internal reaction of the battery cell 20 generates heat, causing the internal temperature of the battery cell 20 to rise and reach a threshold, the pressure relief mechanism 213 can rupture at the notch, causing the inside and outside of the shell 211 to communicate with each other. The gas pressure and temperature are released outward through the rupture of the pressure relief mechanism 213, thereby reducing the probability of explosion of the battery cell 20.

[0072] In addition, the pressure relief mechanism 213 may be any of various possible pressure relief mechanisms, which are not limited in the present embodiment. For example, the pressure relief mechanism 213 may be a temperature-sensitive pressure relief mechanism configured to melt when the internal temperature of the battery cell 20 on which the pressure relief mechanism 213 is provided reaches a threshold; and / or the pressure relief mechanism 213 may be a pressure-sensitive pressure relief mechanism configured to rupture when the internal pressure of the battery cell 20 on which the pressure relief mechanism 213 is provided reaches a threshold.

[0073] The above text, in conjunction with Figure 3, illustrates a schematic structural diagram of a battery cell 20 provided in an embodiment of the present application. The following text, in conjunction with Figures 4 to 11, illustrates a battery 10 provided in an embodiment of the present application. Figures 4 show a structural schematic diagram of a battery 10 provided in an embodiment of the present application. Figures 5 to 11 show cross-sectional schematic diagrams of the battery 10, wherein Figures 5 and 6 respectively show cross-sectional schematic diagrams of the battery 10 before and after the pressure relief mechanism 213 is actuated, Figure 7 shows a cross-sectional schematic diagram of another battery 10 provided in an embodiment of the present application, and Figure 8 also shows a cross-sectional schematic diagram after the pressure relief mechanism 213 is actuated. Similarly, Figures 9 and 10 respectively show cross-sectional schematic diagrams of the battery 10 before and after the pressure relief mechanism 213 is actuated, and Figure 11 also shows a cross-sectional schematic diagram of the battery 10 after the pressure relief mechanism 213 is actuated. It should be noted that the specific structure of the battery 10 can refer to the description in Figures 1-3 above.

[0074] In some implementations, as shown in Figures 4 to 11, the battery 10 includes: a battery cell 20, on which a pressure relief mechanism 213 is provided on the first wall 310 of the battery cell 20; a functional component 320, connected to the first wall 310 of the battery cell 20 and provided with an avoidance through-hole 321, the avoidance through-hole 321 is arranged opposite to the pressure relief mechanism 213, and is used to avoid substances discharged by the battery cell 20 through the pressure relief mechanism 213; an insulating component 330, covering the hole wall surface 3211 of the avoidance through-hole 321, and provided with a protrusion 331 protruding from the hole wall surface 3211, the protrusion 331 is used to limit the flip angle A of the pressure relief mechanism 213, and the flip angle A is the maximum angle of rotation of the pressure relief mechanism 213 after actuation when the battery cell 20 suffers from thermal runaway.

[0075] The pressure relief mechanism 213 and the electrode terminals 214 of the battery cell 20 can be disposed on different walls of the battery cell 20. For example, the first wall 310 of the battery cell 20 is the bottom wall of the battery cell 20, and the electrode terminals 214 are disposed on the wall opposite the bottom wall. Alternatively, the pressure relief mechanism 213 and the electrode terminals 214 can be disposed on the same wall of the battery cell 20, which is not limited in this application.

[0076] The functional component 320 is connected to the first wall 310 of the battery cell 20 . The functional component 320 may be adhered to the first wall 310 by a colloid such as structural adhesive, or the functional component 320 and the first wall 310 may be connected by other structural members.

[0077] In the x-direction, there may be a certain distance between the insulating component 330 and the pressure relief mechanism 213. This distance is not limited in this application. The protrusion 331 of the insulating component 330 only needs to be able to develop the flip angle A of the pressure relief mechanism 213. The x-direction in Figures 4 to 11 can be understood as the horizontal direction.

[0078] The protrusion 331 can be of regular or irregular shape, for example, a protrusion with a curved surface or a protrusion with a flat surface. When the pressure relief mechanism 213 is actuated, it flips over and can be in close contact with, tangent to, or against the surface of the protrusion 331.

[0079] The location of the protrusion 331 can be related to the location of the rotation axis of the pressure relief mechanism 213. For example, the two can be arranged relative to each other, or the protrusion 331 can be arranged in a portion of the avoidance through hole 321 based on the rotation axis of the pressure relief mechanism 213. The rotation axis is the axis along which the pressure relief mechanism 213 rotates, that is, the pressure relief mechanism 213 rotates along the rotation axis when actuated.

[0080] It is worth noting that the pressure relief mechanism 213 can have one or more turning axes. For example, if the weak area on the pressure relief mechanism 213 can be set to different shapes, the number of turning axes can be different. In addition, the turning axis can be a straight line or a curve, which is not limited in this application.

[0081] By providing a protrusion 331 protruding from the hole wall 3211 on the insulating component 330, and then the protrusion 331 is used to limit the maximum flipping angle A of the pressure relief mechanism 213, the probability of the pressure relief mechanism 213 overlapping with the battery casing after flipping when the flipping angle A of the pressure relief mechanism 213 is too large can be reduced, thereby reducing the probability of discharge between the battery cell 20 and the functional component 320 after the battery cell 20 has thermal runaway, thereby improving the overall performance of the battery 10.

[0082] In some implementations, the flip angle A is an acute angle. Thus, in the embodiment of the present application, by setting the flip angle A to an acute angle, the probability of the pressure relief mechanism 213 contacting the battery housing after flipping can be effectively reduced, thereby reducing the probability of discharge between the battery cell 20 and the functional component 320 after thermal runaway of the battery cell 20, thereby improving the overall performance of the battery 10.

[0083] In some implementations, the flip angle A is in the range of 30°≤A≤80°. For example, the flip angle A in the embodiment of the present application can be set to 30°, 40°, 50°, 60°, 70°, 80°, etc., or its value is within the range obtained by combining any two of the above values.

[0084] In the embodiment of the present application, by setting the range of the flip angle A to: 30°≤A≤80°, the probability of the pressure relief mechanism 213 overlapping with the battery casing after flipping can be effectively reduced, thereby further reducing the probability of discharge between the battery cell 20 and the functional component 320 after the battery cell 20 has thermal runaway, thereby improving the overall performance of the battery 10.

[0085] In the embodiment of the present application, the battery 10 further includes: a bottom plate 340, which is disposed on a side of the functional component 320 away from the battery cell 20. The cavity formed between the bottom plate 340 and the functional component 320 is used to accommodate substances discharged from the battery cell 20 after thermal runaway occurs. The flip angle A satisfies the following formula:

[0086] a×sinA <b,

[0087] Wherein, a represents the flip length of the pressure relief mechanism 213 , and b represents the distance between the first wall 310 and the bottom plate 340 of the battery cell 20 .

[0088] When the flipping angle A of the pressure relief mechanism 213 satisfies the above formula, there is a certain distance between the pressure relief mechanism 213 and the bottom plate 340 after flipping, which can reduce the accumulation of discharge while reducing the probability of discharge of the battery cell 20 due to the overlap of the pressure relief mechanism 213 and the bottom plate 340, thereby improving the overall performance of the battery 10.

[0089] In the embodiment of the present application, the flip angle A may satisfy the following formula:

[0090] ba×sinA>C,

[0091] Wherein, C represents the minimum electrical clearance between the pressure relief mechanism 213 and the bottom plate 340 .

[0092] It should be understood that different potential differences between two components may require different minimum clearances and creepage distances. Specific clearance requirements can be found in standards IEC62477-1 and UL840. For example, according to pollution degree 2, when the operating voltage of battery 10 is 1000V, the minimum clearance is 5.5mm and the minimum creepage distance is 10mm. When the operating voltage of battery 10 is 1500V, the minimum clearance is 8mm and the minimum creepage distance is 15mm.

[0093] When the flip angle A of the pressure relief mechanism 213 satisfies the above formula, the distance between the pressure relief mechanism 213 and the bottom plate 340 after flipping meets the electrical safety standard, further reducing the probability of discharge between the battery cell 20 and the functional component 320 and improving the overall performance of the battery 10.

[0094] In the embodiment of the present application, as shown in Figures 4 to 6, the protrusion 331 includes a first inclined surface 3311, which is used to be tightly attached to the pressure relief mechanism 213 after the pressure relief mechanism 213 is flipped over. The angle between the first inclined surface 3311 and the x-direction is equal to the flipping angle A of the pressure relief mechanism 213, and the x-direction is perpendicular to the thickness direction of the pressure relief mechanism 213.

[0095] The first inclined surface 3311 can be a plane or an approximate plane, that is, there is a certain tolerance.

[0096] By setting the first inclined surface 3311 and the pressure relief mechanism 213 to be tightly pressed against each other after being flipped, the first inclined surface 3311 can provide sufficient support force for the pressure relief mechanism 213, thereby reducing the probability of the pressure relief mechanism 213 overlapping with the bottom plate 340, thereby reducing the probability of discharge between the battery cell 20 and the functional component 320, and improving the overall performance of the battery 10.

[0097] In the embodiment of the present application, as shown in FIG. 7 , the protrusion 331 includes a curved surface, which is used to be tangent to the pressure relief mechanism 213 to limit the flipping angle A of the pressure relief mechanism 213 .

[0098] When the curved surface included in the protrusion 331 is used to be tangent to the pressure relief mechanism 213 to limit the flipping angle A of the pressure relief mechanism 213, the protrusion 331 on the insulating component 330 is easy to manufacture, thereby improving the preparation efficiency of the insulating component 330 and further improving the production efficiency of the battery 10.

[0099] In the embodiment of the present application, the battery 10 further includes: a connecting component 350 for connecting the functional component 320 and the first wall 310 of the battery cell 20; and an isolating component 360 filling the gap between the connecting component 350 and the insulating component 330 for isolating the connecting component 350 and the insulating component 330.

[0100] The connecting member 350 can be made of various materials, such as connecting glue, mechanical structural connecting members, etc. When the connecting member 350 is a connecting glue, such as a plastic foot, the isolating member 360 can be called a rubber stopper, which is provided between the connecting member 350 and the insulating member 330 .

[0101] By providing a connecting component 350 to connect the functional component 320 and filling the space between the connecting component 350 and the insulating component 330 with an isolating component 360, it is made difficult for the discharge discharged from the pressure relief mechanism 213 to contact the first wall 310 of the battery cell 20, thereby reducing the probability of discharge between the battery cell 20 and the functional component 320.

[0102] In the embodiment of the present application, the material of the isolation component 360 includes at least one of plastic and rubber. Exemplarily, the material of the isolation component 360 is plastic or rubber. In other implementations, the material of the isolation component 360 includes both plastic and rubber.

[0103] By setting the material of the isolation component 360 , the probability of electrical connection between the functional component 320 and the battery cell 20 can be reduced, thereby reducing the risk of discharge of the battery cell 20 .

[0104] In an embodiment of the present application, the insulating component 330 also covers at least a portion of the first surface 3212 and at least a portion of the second surface 3213 of the functional component 320. The first surface 3212 and the second surface 3213 are both connected to the hole wall 3211 and are arranged relative to each other. The first surface 3212 is closer to the battery cell 20 than the second surface 3213.

[0105] By setting the insulating component 330 to cover partial areas of the two surfaces of the functional component 320 connected to the hole wall 3211, the insulating component 330 covers a larger area, and the insulating component 330 is set between the functional component 320 and the first wall 310 of the battery cell 20, further reducing the risk of discharge of the battery cell 20 and improving the overall performance of the battery 10.

[0106] In some implementations, the functional component 320 is a support component for supporting the battery cell 20 ; or, the functional component 320 is a thermal management component for accommodating a heat exchange medium for performing heat exchange with the battery cell 20 .

[0107] In the embodiment of the present application, by setting the functional component 320 as a supporting component to support the battery cell 20, or setting the functional component 320 as a thermal management component to accommodate a heat exchange medium for heat exchange with the battery cell 20, it is beneficial to improve the overall performance of the battery 10.

[0108] In some embodiments, the melting point of the insulating component 330 is greater than or equal to 100° C. Thus, in the embodiment of the present application, by setting the melting point of the insulating component 330 to be greater than or equal to 100° C., the insulating component 330 limits the flipping angle of the pressure relief mechanism 213 while reducing the risk of damage to the insulating component 330 by the exhaust discharged through the pressure relief mechanism 213, thereby improving the overall performance of the battery 10.

[0109] In the embodiment of the present application, the material of the insulating component 330 includes at least one of polyimide and polytetrafluoroethylene. For example, the material of the insulating component 330 can be polyimide or polytetrafluoroethylene.

[0110] Polyimide (PI) and polytetrafluoroethylene (PFA) have properties such as high temperature resistance.

[0111] By setting the material of the insulating component 330 to polyimide or polyvinyl fluoride, the probability of the insulating component 330 being damaged by the high-temperature fluid discharged from the battery cell 20 is reduced, thereby reducing the probability of discharge between the battery cell 20 and the functional component 320 and improving the overall performance of the battery 10.

[0112] An embodiment of the present application further provides an electrical device, which includes the battery 10 in the above embodiment, and the battery 10 is used to provide electrical energy to the electrical device.

[0113] Optionally, the electrical device may be a vehicle 1 , a ship, or a spacecraft.

[0114] Referring again to Figures 4 to 11, an embodiment of the present application provides a battery 10, which includes: a battery cell 20, a pressure relief mechanism 213 provided on a first wall 310 of the battery cell 20; a functional component 320, connected to the first wall 310 of the battery cell 20, and provided with an avoidance through-hole 321, the avoidance through-hole 321 being arranged opposite to the pressure relief mechanism 213, for avoiding substances discharged from the battery cell 20 through the pressure relief mechanism 213; an insulating component 330, covering the hole wall 321 of the avoidance through-hole 321. 11. A protrusion 331 is provided protruding from the hole wall 3211. The protrusion 331 is used to limit the flip angle A of the pressure relief mechanism 213. The flip angle A is the maximum angle of rotation of the pressure relief mechanism 213 after activation when the battery cell 20 experiences thermal runaway. The bottom plate 340 is provided on the side of the functional component 320 away from the battery cell 20. The cavity formed between the bottom plate 340 and the functional component 320 is used to accommodate substances discharged from the battery cell 20 after thermal runaway occurs. The flip angle A satisfies the following formula:

[0115] a×sinA

[0116] Wherein, a represents the flip length of the pressure relief mechanism 213 , and b represents the distance between the first wall 310 and the bottom plate 340 of the battery cell 20 .

[0117] Although the present application has been described with reference to the above-described embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.​

Claims

1. A battery, characterized in that: The battery (10) comprises: A battery cell (20), wherein a pressure relief mechanism (213) is provided on a first wall (310) of the battery cell (20); a functional component (320) connected to the first wall (310) and provided with an avoidance through-hole (321), wherein the avoidance through-hole (321) is arranged opposite to the pressure relief mechanism (213) and is used for avoiding substances discharged from the battery cell (20) through the pressure relief mechanism (213); An insulating component (330) covers a hole wall surface (3211) of the avoidance through hole (321) and is provided with a protruding portion (331) protruding from the hole wall surface (3211). The protruding portion (331) is used to limit a flip angle A of the pressure relief mechanism (213). The flip angle A is the maximum angle of rotation of the pressure relief mechanism (213) after activation when thermal runaway occurs in the battery cell (20).

2. The battery according to claim 1, characterized in that The flip angle A is an acute angle.

3. The battery according to claim 2, characterized in that The range of the flip angle A is: 30°≤A≤80°.

4. The battery according to any one of claims 1 to 3, characterized in that The battery (10) further comprises: a bottom plate (340) disposed on a side of the functional component (320) away from the battery cell (20); a cavity formed between the bottom plate (340) and the functional component (320) is used to accommodate substances discharged from the battery cell (20) after thermal runaway occurs; the flip angle A satisfies the following formula: a×sinA <b, Wherein, a represents the flipping length of the pressure relief mechanism (213), and b represents the distance between the first wall (310) and the bottom plate (340) of the battery cell (20).

5. The battery according to claim 4, characterized in that The flip angle A satisfies the following formula: ba×sinA>C, Wherein, C represents the minimum electrical clearance between the pressure relief mechanism (213) and the bottom plate (340).

6. The battery according to any one of claims 1 to 5, characterized in that The protrusion (331) includes a first inclined surface (3311), and the first inclined surface (3311) is used to be in close contact with the pressure relief mechanism (213) after the pressure relief mechanism (213) is flipped over. The angle between the first inclined surface (3311) and the x-direction is equal to the flip angle A of the pressure relief mechanism (213), and the x-direction is perpendicular to the thickness direction of the pressure relief mechanism (213).

7. The battery according to any one of claims 1 to 5, characterized in that The protrusion (331) includes a curved surface, and the curved surface is used to be tangent to the pressure relief mechanism (213) to limit the flip angle A of the pressure relief mechanism (213).

8. The battery according to any one of claims 1 to 7, characterized in that The battery (10) further comprises: a connecting component (350) for connecting the functional component (320) and the first wall (310) of the battery cell (20); An isolation component (360) is filled in the gap between the connecting component (350) and the insulating component (330) and is used to isolate the connecting component (350) from the insulating component (330).

9. The battery according to claim 8, characterized in that The material of the isolation component (360) is plastic or rubber.

10. The battery according to any one of claims 1 to 9, characterized in that The insulating component (330) also covers at least a portion of the first surface (3212) and at least a portion of the second surface (3213) of the functional component (320), the first surface (3212) and the second surface (3213) are both connected to the hole wall (3211) and arranged opposite to each other, and the first surface (3212) is closer to the battery cell (20) than the second surface (3213).

11. The battery according to any one of claims 1 to 10, characterized in that The functional component (320) is a supporting component, and the supporting component is used to support the battery cell (20); or, The functional component (320) is a heat management component, and the heat management component is used to accommodate a heat exchange medium to perform heat exchange with the battery cell (20).

12. The battery according to any one of claims 1 to 11, characterized in that The melting point of the insulating component (330) is greater than or equal to 100°C.

13. The battery according to any one of claims 1 to 12, characterized in that The insulating component (330) is made of polyimide or polyvinyl fluoride.

14. An electrical device, characterized in that: The device comprises a battery (10) according to any one of claims 1 to 13, wherein the battery (10) is used to provide electrical energy to the electrical device.

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