Batteries and electrical devices

Abstract

Embodiments of the present application disclose a battery and an electric device. The battery comprises: a battery cell having a pressure reducing mechanism disposed on a first wall; and a protective plate, which is a polymer-based composite fiber plate disposed opposite the pressure reducing mechanism. The technical solution according to the present application can enhance the safety performance of the battery by protecting the battery box from airflow shock and high-temperature melting that occur during thermal runaway of the battery.

Description

Technology Field

[0001] This application claims priority to Chinese patent application No. 202210423355.6 filed on April 21, 2022, under the title "Battery and electric device," the full details of which are incorporated by reference into this document.

[0002] This application relates to the field of battery technology, and in particular, to batteries and electric devices. Background Technology

[0003] Energy conservation and carbon emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles have emerged as an important component of the sustainable development of automobiles due to their energy-saving and eco-friendly advantages. For electric vehicles, one of the critical elements in their development is battery technology.

[0004] In the advancement of battery technology, safety issues cannot be overlooked alongside performance enhancements. If battery safety is not ensured, the battery becomes unusable. Therefore, determining how to enhance battery safety is an urgent technical challenge that must be addressed in battery technology. The problem to be solved

[0005] The present application, taking into account the aforementioned problem, provides a battery and a battery device capable of enhancing the safety performance of a battery by protecting the battery box from airflow shock and high-temperature melting that occur during thermal runaway of the battery. means of solving the problem

[0006] According to the first aspect, a battery is provided comprising: a battery cell having a pressure reducing mechanism disposed on a first wall; and a protective plate which is a polymer-based composite fiber plate disposed opposite to the pressure reducing mechanism.

[0007] In an embodiment of the present application, the battery comprises a battery cell, and a pressure reduction mechanism for protecting the battery cell is disposed on the first wall of the battery cell. The battery further comprises a protective plate, and the protective plate is disposed opposite the pressure reduction mechanism; that is, the protective plate is opposed to the pressure reduction mechanism. The protective plate is a polymer-based composite fiber plate capable of withstanding high temperatures and shocks. By arranging the pressure reduction mechanism and the protective plate opposite each other, in the event of thermal runaway of the battery cell, the protective plate of the polymer-based composite fiber blocks the high-temperature and high-speed gas-solid mixture released from the pressure reduction mechanism, thereby protecting the battery box from airflow shock and high-temperature melting, and thus ensuring the safety of the battery.

[0008] In one possible embodiment, the polymer substrate composite fiber board is a fiber-reinforced resin composite board.

[0009] In an embodiment of the present application, by manufacturing a fiber-reinforced resin composite plate using a polymeric resin as a base and using it as a protective plate, the fiber-reinforced resin composite plate exhibits superior high temperature resistance and impact resistance compared to base plates made of other polymeric materials.

[0010] In a possible embodiment, the battery cell is housed in a box, and the first wall is a wall of the battery cell positioned near the upper cover of the box and opposite to the upper cover.

[0011] In an embodiment of the present application, when the first wall is close to the upper cover of the box and is a wall of a battery cell positioned opposite the upper cover, the pressure reduction mechanism faces the upper cover. The protective plate is positioned opposite the pressure reduction mechanism, that is, the protective plate is positioned close to the upper cover. In the event of thermal runaway of the battery cell, the protective plate of the polymer-based composite fiber can block the high-temperature and high-speed gas-solid mixture released from the pressure reduction mechanism, thereby protecting the upper cover of the battery from airflow shock and high-temperature melting.

[0012] In a possible embodiment, the protective plate is positioned to be integrated with the upper cover.

[0013] In an embodiment of the present application, the protective plate is arranged to be integrated with the upper cover. The protective plate can be used together with the upper cover as the upper cover of the battery, or the protective plate can be used alone as the upper cover of the battery. When the protective plate is used together with the upper cover as the upper cover of the battery, the protective plate protects the upper cover and further better protects the battery. When the protective plate is used alone as the upper cover of the battery, it protects the upper cover of the battery from high temperatures and airflow shocks, while simultaneously simplifying the structure of the upper cover of the battery.

[0014] In a possible embodiment, the protective plate is positioned between the upper cover and the first wall.

[0015] In an embodiment of the present application, the protective plate is positioned between the upper cover and the first wall, that is, the protective plate is positioned between the upper cover and the pressure reduction mechanism. By doing so, the protective plate can directly protect the upper cover from high temperature and airflow shock, thereby enhancing the safety performance of the battery.

[0016] In a possible embodiment, the protective plate and the upper cover are of the same size.

[0017] In an embodiment of the present application, a protective plate is disposed between the upper cover and the first wall. When the protective plate and the upper cover are of the same size, the protective plate can not only protect the upper cover from the high temperature and high speed gas-solid mixture released from the depressurization mechanism but also improve the sealing effect on the inside of the battery. Furthermore, if the protective plate and the upper cover are of the same size, assembly is advantageous and the difficulty of assembly is reduced.

[0018] In a possible embodiment, the protective plate is smaller in size than the upper cover.

[0019] In an embodiment of the present application, a protective plate is disposed between an upper cover and a first wall. When the size of the protective plate is smaller than that of the upper cover, the protective plate protects the upper cover while reducing costs.

[0020] In one possible embodiment, the protective plate is bar-shaped, and the projection of the protective plate projected onto the first wall covers the pressure relief mechanism.

[0021] In an embodiment of the present application, a protective plate is disposed between an upper cover and a first wall. When the protective plate is bar-shaped and the projection projected onto the first wall covers a pressure relief mechanism, the protective plate can maintain an excellent protective effect on the upper cover, while minimizing costs and avoiding material waste in unprotected areas.

[0022] In one possible embodiment, the protective plate and the upper cover are fastened with bolts or adhesive.

[0023] In the embodiment of the present application, bolts or adhesives are used to implement the fastening between the protective plate and the upper cover, and this fastening method is simple to implement and highly workable, making it advantageous for widespread use in production.

[0024] In a possible embodiment, the battery cell is accommodated in a box, and the first wall is a wall of the battery cell positioned near the bottom wall of the box and facing the bottom wall.

[0025] In an embodiment of the present application, when the first wall is close to the bottom wall of the box and is the wall of a battery cell positioned opposite the bottom wall, the pressure reduction mechanism faces the bottom wall. The protective plate is positioned opposite the pressure reduction mechanism, that is, the protective plate is positioned close to the bottom wall. When thermal runaway occurs inside the battery cell, the protective plate of the polymer-based composite fiber can block the high-temperature and high-speed gas-solid mixture released from the pressure reduction mechanism, thereby protecting the bottom wall of the battery from airflow shock and high-temperature melting.

[0026] In a possible embodiment, the protective plate is positioned to be integrated with the bottom wall of the box.

[0027] In an embodiment of the present application, the protective plate is arranged to be integrated with the bottom wall. The protective plate can be used together with the bottom wall as the bottom wall of the battery, or the protective plate can be used alone as the bottom wall of the battery. When the protective plate is used together with the bottom wall as the bottom wall of the battery, the protective plate protects the bottom wall and further better protects the battery. When the protective plate is used alone as the bottom wall of the battery, it protects the bottom wall of the battery from high temperatures and airflow shocks, while simultaneously simplifying the structure of the bottom wall of the battery.

[0028] In a possible embodiment, the protective plate is positioned between the bottom wall and the first wall.

[0029] In an embodiment of the present application, the protective plate is positioned between the bottom wall and the first wall, that is, the protective plate is positioned between the bottom wall and the pressure reduction mechanism. By doing so, the protective plate can directly protect the bottom wall from high temperature and airflow shock, thereby ensuring the safety performance of the battery.

[0030] In a possible embodiment, a thermal management member containing a fluid is disposed between the protective plate and the first wall to regulate the temperature of the battery cell.

[0031] In an embodiment of the present application, the protective plate is disposed between the first wall and the battery box, or the protective plate is used directly as a battery box to protect the battery box from high temperature and airflow shock, and further enhance the safety performance of the battery. A thermal management member for controlling the temperature of the battery cell is provided between the first wall and the protective plate, thereby controlling the temperature of the battery cell according to the actual needs of the battery cell and further ensuring the normal operation of the battery cell.

[0032] In a possible embodiment, the thermal management member is provided with a vulnerable area positioned opposite to the pressure reduction mechanism, and the vulnerable area is configured to be destroyed by the discharge when the pressure reduction mechanism operates, so that the discharge of the battery cell passes through the vulnerable area.

[0033] In an embodiment of the present application, the protective plate may be placed between the first wall and the battery box, or the protective plate may be used directly as the battery box to protect the safety of the battery. A thermal management member is provided between the first wall and the protective plate so that the temperature of the battery cell can be controlled according to the actual needs of the battery cell, and furthermore, normal operation of the battery cell can be ensured. The thermal management member is provided with a vulnerable area so that when the vulnerable area is destroyed due to airflow shock or high temperature, the emitted material passes through the vulnerable area and is rapidly discharged outside the battery cell, thereby reducing the risk of emitted material to the battery and enhancing the safety performance of the battery.

[0034] In a possible embodiment, an insulating member is disposed between the protective plate and the box.

[0035] In an embodiment of the present invention, by adding a protective plate between the first wall equipped with a pressure reducing mechanism and the box, the battery box can be protected from the impact of high temperature and high-speed airflow. By further disposing of an insulating member between the protective plate and the box, the temperature of the box can be further lowered and the safety performance of the battery can be further enhanced.

[0036] In a possible embodiment, the insulating member is an air intermediate layer.

[0037] In an embodiment of the present application, by placing an intermediate air layer as an insulating member between the protective plate and the box, the temperature of the box can be further lowered and the safety performance of the battery can be enhanced.

[0038] In one possible embodiment, the protective plate comprises a multilayer fiber-reinforced resin layer formed compositely of a fiber material and a resin material.

[0039] In the embodiments of the present application, the fiber-reinforced resin is a material capable of withstanding high temperatures and impacts. By using a protective plate made of such a material and placing the protective plate between the pressure reduction mechanism and the box, when high temperatures and ejected materials inside the battery cell pour out of the battery cell at high speed, the protective plate can protect the box from the impact of high-temperature melting and high-speed ejected materials, and further protect the safety of the battery.

[0040] In one possible embodiment, the resin material is a silicone-based aerogel-modified resin or a flame-retardant resin resistant to high temperatures.

[0041] In the embodiments of the present application, the material compositely composed of fibers and resin has heat resistance and impact resistance. The heat resistance and impact resistance of the protective plate can be further improved by using a silicone-based aerogel-modified resin or a flame-retardant resin resistant to high temperatures.

[0042] In one possible embodiment, the fiber material is at least one of fibers such as glass fiber, ceramic fiber, carbon fiber, quartz fiber, high silica fiber, aluminum silicate fiber, mullite fiber, silicon carbide fiber, silicon nitride fiber, alumina fiber, boron nitride fiber, basalt fiber, brucite fiber, attapulgite fiber, boron fiber, carbon nanotube fiber, aramid fiber, polyimide fiber, ultra-high molecular weight polyethylene fiber, etc.

[0043] In one possible embodiment, the fiber material is a ceramic fiber material.

[0044] In the embodiments of the present application, the material composed of fibers and resins has heat resistance and impact resistance. The ceramic fiber material has superior heat resistance compared to other fiber materials.

[0045] In one possible embodiment, the ceramic fiber material is silica or alumina.

[0046] In the embodiments of the present application, the protective plate manufactured using silica or alumina has the best heat resistance.

[0047] In one possible embodiment, the fiber material has a thickness of 6 to 100 μm.

[0048] In the embodiment of the present application, by using a fiber material with a thickness of 6 to 100 μm, the protective plate can be made to have heat resistance and impact resistance, as well as reduce production costs.

[0049] In a possible embodiment, the protective plate has a thickness of 0.2 to 5 mm.

[0050] In the embodiment of the present application, by using a protective plate with a thickness of 0.2 to 5 mm, the protective plate can be made to have heat resistance and impact resistance, and production costs can also be reduced.

[0051] In a second aspect, an electric device is provided that includes a battery according to any one of the embodiments described above for supplying electric energy. Brief explanation of the drawing

[0052] FIG. 1 is a schematic structural diagram of a vehicle according to one embodiment of the present application. FIG. 2 is a schematic separation structure diagram of a battery according to one embodiment of the present application. FIG. 3 is a schematic separation structure diagram of a battery cell according to one embodiment of the present application. FIG. 4 is a schematic separation structure diagram of a battery according to another embodiment of the present application. FIG. 5 is a schematic half-section diagram of a battery box according to one embodiment of the present application. FIG. 6 is a schematic diagram of an upper cover of a battery according to one embodiment of the present application. FIG. 7 is a schematic separation structure diagram of a battery according to another embodiment of the present application. FIG. 8 is a schematic separation structure diagram of a battery according to another embodiment of the present application. FIG. 9 is a schematic separation structure diagram of the bottom wall of a battery according to one embodiment of the present application. FIG. 10 is a schematic half-section diagram of a battery box according to another embodiment of the present application. FIG. 11 is a schematic separation structure diagram of the bottom wall of a battery according to another embodiment of the present application. FIG. 12 is a schematic structural diagram of a fiber-reinforced resin layer according to one embodiment of the present application. Specific details for implementing the invention

[0053] Hereinafter, embodiments according to the technical solution of the present application will be described in detail with reference to the attached drawings. The following embodiments are intended merely to more clearly explain the technical solution of the present application and are to be used only as examples and should not be used to limit the scope of protection of the present application.

[0054] All technical and scientific terms used in this document, unless otherwise defined, have the meaning generally understood by those skilled in the art to which this application pertains; the terms used in this document are merely for describing specific embodiments and are not intended to limit this application; and the terms “comprising” and “having,” and any variations thereof, in the specification, claims, and brief description of the accompanying drawings of this application are intended to encompass non-exclusive inclusion.

[0055] In describing the embodiments of this application, technical terms such as "first," "second," etc., are used merely to distinguish different objects and should not be understood as indicating or implying relative importance, or implying the quantity, specific order, or primary and secondary relationship of the indicated technical features. In describing the embodiments of this application, "plural" refers to two or more unless otherwise explicitly and specifically limited.

[0056] The term "Examples" as used herein means that specific features, structures, or characteristics described in relation to the Examples may be included in at least one of the Examples of this Application. Such phrases located at various points in the specification do not necessarily refer to the same Example, nor are they separate or alternative Examples mutually exclusive from other Examples. It will be understood by those skilled in the art, both expressly and implicitly, that the Examples mentioned herein may be combined with other Examples.

[0057] In describing the embodiments of the present application, the term "and / or" is used to describe the association between related objects and indicates that there may be three types of relationships; for example, A and / or B may indicate three cases, such as A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the " / " character in this document generally indicates that the related objects before and after are in an "or" relationship.

[0058] In describing the embodiments of the present application, the term “multiple” indicates two or more (including two), likewise “multiple groups” indicates two or more groups (including two groups), and “multiple sheets” indicates two or more sheets (including two sheets).

[0059] In describing the embodiments of the present application, technical terms such as “center,” “vertical,” “horizontal,” “length,” “width,” “thickness,” “top,” “bottom,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inside,” “outside,” “clockwise,” “counterclockwise,” “axial,” “radial,” “circular,” etc., indicate orientations or positional relationships based on the orientations or positional relationships depicted in the drawings. These terms are intended merely for the convenience and simplification of the description of the embodiments of the present application and do not indicate or imply that the mentioned devices or components must have a specific orientation or be configured and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0060] In describing the embodiments of this application, technical terms such as “installation,” “combination,” “connection,” and “fixing” should be understood in a broad sense, for example, they may be fixed connections, detachable connections, or integral connections; they may also be mechanical connections or electrical connections; they may be direct connections or indirect connections through an intermediate medium; and they may be internal communication between two components or interaction relationships between two components. The specific meaning of the above terms in this application will be understood by those skilled in the art according to the specific circumstances.

[0061] In this application, the battery cell may include a lithium metal battery, a sodium metal battery, or a magnesium metal battery, and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, or have other shapes, and the embodiments of this application are not limited thereto. Battery cells are generally classified into three types according to the packaging method, such as cylindrical battery cells, prismatic battery cells, and pouch-type battery cells, and the embodiments of this application are not limited thereto. For convenience of explanation, the following embodiments will be described using a lithium metal battery as an example.

[0062] The battery mentioned in the embodiments of the present application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack, etc. The battery generally includes a box for packaging one or more battery cells. The box can prevent liquid or other foreign substances from affecting the charging or discharging of the battery cells.

[0063] In new energy battery vehicles, the battery box, which serves as the energy source, is mounted on the vehicle, and the batteries within the box discharge to drive the vehicle's motor. As public demand for new energy vehicles gradually increases, the demand for battery energy density is also continuously rising. In the case of high-energy battery systems using silicon-doped cathodes, thermal runaway of a single or multiple cells can generate gases with temperatures exceeding 1,500°C. When the maximum velocity of the gas exceeds the speed of sound, conventional insulating materials composed mainly of aerogel can no longer block the thermal and airflow shocks caused by these high-temperature and high-speed airflows. Consequently, these aerogel-based insulating materials may undergo structural thermal and mechanical decomposition, leading to protection failure. High-temperature and high-speed airflows pass through the battery pack box, directly igniting the battery box made of steel plates with a melting point of 1,500°C. This continuous combustion for approximately 30 seconds directly destroys the body of the new energy vehicle, thereby compromising passenger safety.

[0064] An embodiment of the present application for solving the aforementioned problem provides a technical solution. A protective plate is disposed within the box of a battery pack, and the protective plate can improve the safety of the battery by blocking the high-temperature and high-speed gas-solid mixture generated during thermal runaway of the battery, thereby protecting the battery box from airflow shock and high-temperature melting.

[0065] A protective plate according to an embodiment of the present application is applied to a battery and an electric device using the battery.

[0066] Electric devices may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles may be gasoline / diesel vehicles, natural gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or range-extended electric vehicles (EREVs), etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys such as, for example, game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, and include, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers, etc. The embodiments of this application are not particularly limited to the electric devices described above.

[0067] For the convenience of explanation, the following embodiments will be described using the case where the electrical device is a vehicle as an example.

[0068] FIG. 1 is a schematic structural diagram of a vehicle (1) according to one embodiment of the present application. As shown in FIG. 1, a battery (2) is disposed inside the vehicle (1), and the battery (2) may be disposed at the bottom, front, or rear of the vehicle (1). The battery (2) can supply power to the vehicle (1), and, for example, the battery (2) can be used as an operating power source for the vehicle (1).

[0069] FIG. 2 is a schematic separation diagram of a battery (2) according to one embodiment of the present application. As shown in FIG. 2, the battery (2) includes a box (20), a battery cell (6), and a protective plate (8). The battery cell (6) and the protective plate (8) are accommodated within the box (20).

[0070] The box (20) is intended to accommodate a battery cell (6). The box (20) may have various structures. In some embodiments, the box (20) includes a first box portion (201) and a second box portion (202), and the first box portion (201) and the second box portion (202) may be joined together by covering each other to jointly define a receiving space (203) for accommodating the battery cell (6). The second box section (202) may be a hollow structure with one end open, and the first box section (201) may be a plate-shaped structure. The first box section (201) covers and joins the opening side of the second box section (202) so that a box (20) having a receiving space (203) is formed. Both the first box section (201) and the second box section (202) may be hollow structures with one end open, and the opening side of the first box section (201) covers and joins the opening side of the second box section (202) so that a box (20) having a receiving space (203) is formed. Of course, the first box section (201) and the second box section (202) may have various shapes such as a cylinder or a rectangular prism.

[0071] In order to improve the sealing performance after the first box section (201) and the second box section (202) are combined, a sealing member such as a sealant or a sealing ring may be provided between the first box section (201) and the second box section (202).

[0072] Assuming that the first box section (201) is covered and joined to the upper part of the second box section (202), the first box section (201) can be called an upper cover, and the second box section (202) can be called a bottom wall.

[0073] In the battery (2), there are multiple battery cells (6). Multiple battery cells (6) may be connected in series, parallel, or mixed. Mixed connection means that some of the multiple battery cells (6) are connected in series and others are connected in parallel. Multiple battery cells (6) may be directly connected in series, parallel, or mixed, and then a complete unit formed by the multiple battery cells (6) may be housed in a box (20). Alternatively, multiple battery cells (6) may first be connected in series, parallel, or mixed to form a battery module (not shown), and then the multiple battery modules may be connected in series, parallel, or mixed to form a single complete unit and housed in a box (20). Multiple battery cells (6) of a battery module may be electrically connected through a bus member to enable the series, parallel, or mixed connection of the multiple battery cells (6) of the battery module.

[0074] FIG. 3 is a schematic diagram of the structure of a battery cell (6) according to one embodiment of the present application. As shown in FIG. 3, the battery cell (6) includes one or more electrode assemblies (61), a casing body (621), and an end cap (622). The casing body (621) and the end cap (622) form a housing or battery casing (62). The walls of the casing body (621) and the end cap (622) are both referred to as the walls of the battery cell (6), wherein, in the case of a rectangular battery cell (6), the walls of the casing body (621) include a bottom wall and four side walls. The casing body (621) is determined according to the combined shape of one or more electrode assemblies (61). For example, the casing body (621) may be a hollow rectangular prism, a cube, or a cylinder, and the casing body (621) is provided with an opening in one of its planes so that one or more electrode assemblies (61) can be placed inside the casing body (621). For example, when the casing body (621) is a hollow rectangular prism or a cube, one plane of the casing body (621) is an open plane, that is, no wall is provided in this plane so that the inside and outside of the casing body (621) can communicate with each other. When the casing body (621) is a hollow cylinder, the cross-section of the casing body (621) is an open plane, that is, no wall is provided in this cross-section so that the inside and outside of the casing body (621) can communicate with each other. The end cap (622) covers the opening and is connected to the casing body (621) to form a sealed chamber in which the electrode assembly (61) is placed. An electrolyte, such as an electrolyte solution, is filled inside the casing body (621).

[0075] This battery cell (6) may further include two electrode terminals (63) that can be disposed on an end cap (622). The end cap (622) is typically flat, and the two electrode terminals (63) are fixed to the flat surface of the end cap (622), and the two electrode terminals (63) are a positive terminal (631) and a negative terminal (632), respectively. At each electrode terminal (63), a connecting member (64) (also called a current collector member (64)) is correspondingly disposed between the end cap (622) and the electrode assembly (61) to electrically connect the electrode assembly (61) and the electrode terminal (63).

[0076] Depending on actual usage demand, the battery assemblies (61) can be arranged in a single or multiple numbers in this battery cell (6), and as shown in FIG. 3, four independent battery assemblies (61) are arranged within the battery cell (6).

[0077] A pressure reduction mechanism (65) may be further provided in the battery cell (6). The pressure reduction mechanism (65) is intended to operate to release the internal pressure or temperature when the internal pressure or temperature of the battery cell (6) reaches a critical value.

[0078] FIG. 4 is a schematic separation structure diagram of a battery according to another embodiment of the present application. As shown in FIG. 4, the battery (2) comprises a battery cell (6) having a pressure reduction mechanism (65) disposed on a first wall, and a protective plate (8) which is a polymer-based composite fiber plate disposed opposite the pressure reduction mechanism (65).

[0079] In an embodiment of the present application, the pressure reduction mechanism (65) is a structural component that operates to release the internal pressure of the battery cell (6) when the internal pressure or temperature of the battery cell (6) reaches a critical value. For example, the pressure reduction mechanism (65) may be a temperature-sensitive pressure reduction mechanism configured to dissolve when the internal temperature of the battery cell (6) in which the pressure reduction mechanism (65) is placed reaches a critical value, and / or the pressure reduction mechanism (65) may be a pressure-sensitive pressure reduction mechanism configured to burst when the internal pressure of the battery cell (6) in which the pressure reduction mechanism (65) is placed reaches a critical value, and the present application does not limit the type of pressure reduction mechanism.

[0080] The battery (2) includes a battery cell (6), and a pressure reduction mechanism (65) for protecting the battery cell (6) is disposed on the first wall of the battery cell (6). The battery (2) further includes a protective plate (8) disposed opposite the pressure reduction mechanism (65), that is, the protective plate (8) faces the pressure reduction mechanism (65). The protective plate (8) is a polymer-based composite fiber plate capable of withstanding high temperatures and impacts.

[0081] In the above technical solution, by arranging the pressure reduction mechanism (65) and the pressure reduction mechanism (65) facing each other, when thermal runaway occurs inside the battery cell (6), the protective plate (8) of the polymer substrate composite fiber blocks the high temperature and high speed gas-solid mixture released from the pressure reduction mechanism (65), thereby protecting the battery housing from airflow shock and high temperature melting and ensuring the safety of the battery (2).

[0082] Optionally, the polymer-based composite fiberboard is a fiber-reinforced resin composite board.

[0083] In the above technical solution, by manufacturing a fiber-reinforced resin composite plate using a polymer material resin as the base and using it as a protective plate (8), the fiber-reinforced resin composite plate has superior high temperature resistance and impact resistance compared to a base of other polymer materials.

[0084] Optionally, as illustrated in FIG. 4, a battery cell (6) is accommodated in a box (20), and the first wall is a wall of the battery cell (6) positioned near the upper cover (201) of the box (20) and facing the upper cover (201).

[0085] When the first wall is close to the upper cover (201) of the box (20) and is the wall of the battery cell (6) positioned opposite the upper cover (201), the pressure reduction mechanism (65) is close to the upper cover (201) and faces the upper cover (201).

[0086] In the above technical solution, the protective plate (8) is positioned between the pressure reduction mechanism (65) and the upper cover (201). When the pressure reduction mechanism (65) releases the temperature and pressure inside the battery cell (6) due to thermal runaway of the battery cell (6), the protective plate (8) of the polymer substrate composite fiber blocks the high temperature and high speed gas-solid mixture released from the pressure reduction mechanism (65), thereby protecting the upper cover (201) of the battery (2) from airflow shock and high-temperature melting, and further protecting the safety of the battery (2).

[0087] FIG. 5 is a schematic half-section diagram of a battery box according to one embodiment of the present application. As shown in FIG. 5, the protective plate (8) is optionally arranged to be integrated with the upper cover (201).

[0088] The protective plate (8) is arranged to be integrated with the upper cover (201), that is, the protective plate (8) may be used as the upper cover (201) of the battery (2) together with the upper cover (201), or as shown in FIG. 5, the protective plate (8) may be used alone as the upper cover (201) of the battery (2).

[0089] In the above technical solution, when the protective plate (8) is used together with the upper cover (201) as the upper cover (201) of the battery (2), the upper cover (201) of the battery (2) has a two-layer structure, and the protective plate (8) protects the upper cover (201) and further better protects the safety of the battery (2). When the protective plate (8) is used alone as the upper cover (201) of the battery (2), the protective plate (8) can not only protect the upper cover (201) of the battery (2) from high temperature and airflow shock, but also further simplify the structure of the battery (2), thereby reducing the production cost of the battery (2).

[0090] FIG. 6 is a schematic diagram of an upper cover according to one embodiment of the present application. As shown in FIG. 6, when the protective plate (8) is arranged to be integrated with the upper cover (201), the upper cover (201) may have an irregular shape. In an embodiment of the present application, the upper cover (201) may be rectangular, circular, etc., but the present application does not limit it in any way, that is, the upper cover (201) and the protective plate (8) can be manufactured in any shape according to specific product demand during the production process.

[0091] Optionally, as shown in FIG. 4, a protective plate (8) is placed between the upper cover (201) and the first wall.

[0092] The protective plate (8) is positioned between the upper cover (201) and the first wall, that is, the pressure relief mechanism (65) faces the upper cover (201), and the protective plate (8) is positioned between the upper cover (201) and the pressure relief mechanism (65).

[0093] In the above technical solution, the protective plate (8) is positioned between the upper cover (201) and the pressure reduction mechanism (65), and the pressure reduction mechanism (65) faces the upper cover (201). In this way, the protective plate (8) can directly protect the upper cover (201), thereby protecting the upper cover (201) facing the pressure reduction mechanism (65) from high temperature and airflow shocks, and thus ensuring the safety of the battery (2).

[0094] Referring further to FIG. 4, optionally the protective plate (8) is the same size as the upper cover (201).

[0095] The protective plate (8) is placed between the upper cover (201) and the pressure relief mechanism (65) and is made the same size as the upper cover (201), thereby allowing the protective plate (8) to protect the upper cover (201) more comprehensively.

[0096] In the above technical solution, when the protective plate (8) is positioned between the upper cover (201) and the pressure reduction mechanism (65) and the size of the protective plate (8) is the same as that of the upper cover (201), the protective plate (8) can not only protect the upper cover (201) from the high temperature and high speed gas-solid mixture released from the pressure reduction mechanism (65) but also improve the sealing effect on the inside of the battery (2). In addition, if the sizes of the protective plate (8) and the upper cover (201) are the same, assembly is advantageous and the difficulty of assembly is reduced.

[0097] FIG. 7 is a schematic separation structure diagram of a battery according to another embodiment of the present application. As shown in FIG. 7, optionally, the protective plate (8) is smaller in size than the upper cover (201).

[0098] In the above technical solution, the protective plate (8) is positioned between the first wall, where the pressure reduction mechanism (65) is placed, and the upper cover (201). When the size of the protective plate (8) is smaller than that of the upper cover (201), the protective plate (8) can protect the upper cover (201), thereby improving the safety performance of the battery (2) and reducing production costs.

[0099] FIG. 8 is a schematic separation structure diagram of a battery according to another embodiment of the present application. As shown in FIG. 8, optionally the protective plate (8) is bar-shaped, and the projection of the protective plate (8) projected onto the first wall covers the pressure reduction mechanism (65).

[0100] The shape of the protective plate (8) may be a bar shape as shown in FIG. 8, a circle, or any other shape, and as long as the projection of the protective plate (8) projected onto the first wall can cover the pressure reduction mechanism (65) and protect the box of the battery (2), the present application does not limit the shape of the protective plate (8).

[0101] In the above technical solution, the protective plate (8) is positioned between the upper cover (201) and the first wall. When the protective plate (8) is bar-shaped and the projection projected onto the first wall covers the pressure relief mechanism (65), the protective plate (8) can maintain an excellent protective effect on the upper cover (201), while minimizing costs and avoiding material waste in unprotected areas.

[0102] Optionally, the protective plate (8) and the upper cover (201) are fastened with bolts or adhesive.

[0103] There are various methods of fastening the protective plate (8) and the upper cover (201), and as long as both can be fixed, the present application does not limit them in any way. However, in the actual production process, selecting a fastening method that is convenient and has excellent workability is advantageous for widespread adoption in actual application.

[0104] In the above technical solution, bolts or adhesive are used to implement the connection between the protective plate (8) and the upper cover (201), and this connection method is simple to implement and highly workable, making it advantageous for widespread application in production.

[0105] FIG. 9 is a schematic diagram of the bottom wall of a battery according to one embodiment of the present application. As shown in FIG. 9, optionally, a battery cell (6) is accommodated in a box (20), and the first wall is a wall of the battery cell (6) positioned near the bottom wall (202) of the box (20) and facing the bottom wall (202).

[0106] When the first wall is close to the bottom wall (202) of the box (20) and is the wall of the battery cell (6) positioned opposite the bottom wall (202), the pressure reduction mechanism (65) is close to the bottom wall (202) and faces the bottom wall (202).

[0107] In the above technical solution, the protective plate (8) is placed between the pressure reduction mechanism (65) and the bottom wall (202). When the pressure reduction mechanism (65) releases the temperature and pressure inside the battery cell (6) due to thermal runaway of the battery cell (6), the protective plate (8) of the polymer substrate composite fiber blocks the high temperature and high speed gas-solid mixture released from the pressure reduction mechanism (65), thereby protecting the bottom wall (202) of the battery (2) from airflow shock and high temperature melting, and further protecting the safety of the battery (2).

[0108] FIG. 10 is a schematic half-section diagram of a battery box according to another embodiment of the present application. As shown in FIG. 10, the protective plate (8) is optionally positioned to be integrated with the bottom wall (202).

[0109] The protective plate (8) is arranged to be integrated with the bottom wall (202), that is, the protective plate (8) may be used as the bottom wall (202) of the battery (2) together with the bottom wall (202), or as shown in FIG. 10, the protective plate (8) may be used alone as the bottom wall (202) of the battery (2).

[0110] In the above technical solution, when the protective plate (8) is used together with the bottom wall (202) as the bottom wall (202) of the battery (2), the bottom wall (202) of the battery (2) has a two-layer structure, thereby the protective plate (8) protects the bottom wall (202) and further better protects the safety of the battery (2). When the protective plate (8) is used alone as the bottom wall (202) of the battery (2), the protective plate (8) can not only protect the bottom wall (202) of the battery (2) from high temperature and airflow shock, but also further simplify the structure of the battery (2), thereby reducing the production cost of the battery (2).

[0111] When the pressure reduction mechanism (65) inside the battery (2) faces only the upper cover (201), the protective plate (8) is arranged to be integrated with the upper cover (201) to protect the safety of the battery (2), and when the pressure reduction mechanism (65) faces only the bottom wall (202), the protective plate (8) is arranged to be integrated with the bottom wall (202) to protect the safety of the battery (2). When the pressure reduction mechanism (65) inside the battery (2) faces both the upper cover (201) and the bottom wall (202), as shown in FIG. 10, the protective plate (8) can be arranged on both the upper cover (201) and the bottom wall (202). The present application does not specifically limit the placement of the protective plate (8) in the battery (2), and it is sufficient if the protective plate (8) is on the wall facing the pressure reduction mechanism (65) of the battery cell (6) of the battery (2), that is, the protective plate (8) may be an upper cover (201), a bottom wall (202), and a side wall. Additionally, the protective plate (8) may be a beam of the battery (2), and the specific location of the protective plate (8) may be modified according to the arrangement position of the battery cell (6) of the battery (2), or may be placed at any location within the battery (2) according to actual application needs.

[0112] Optionally, as shown in FIG. 9, a protective plate (8) is placed between the floor wall (202) and the first wall.

[0113] The protective plate (8) is positioned between the floor wall (202) and the first wall, that is, the pressure relief mechanism (65) faces the floor wall (202), and the protective plate (8) is positioned between the floor wall (202) and the pressure relief mechanism (65).

[0114] In the above technical solution, the protective plate (8) is positioned between the bottom wall (202) and the pressure reduction mechanism (65), and the pressure reduction mechanism (65) faces the upper cover (201). In this way, the protective plate (8) can directly protect the bottom wall (202), thereby protecting the bottom wall (202) facing the pressure reduction mechanism (65) from high temperature and airflow shocks, and thus ensuring the safety of the battery (2).

[0115] Optionally, as shown in FIG. 9, a thermal management member (66) containing a fluid is disposed between the protective plate (8) and the first wall to regulate the temperature of the battery cell (6).

[0116] The thermal management member (66) is used to contain a fluid to control the temperature of the battery cell (6). Here, the fluid may be a liquid or a gas, and temperature control means heating or cooling the battery cell (6). When cooling the battery cell (6) or lowering its temperature, the thermal management member (66) is used to contain a cooling liquid to lower the temperature of the battery cell (6). In this case, the thermal management member (66) may also be referred to as a cooling member, a cooling system, or a cooling plate, and the contained fluid may be referred to as a refrigerant or a cooling fluid, or more specifically, a cooling liquid or a cooling gas. Additionally, the thermal management member (66) may be used to heat the battery cell (6) to raise its temperature, and the embodiments of the present application are not limited thereto. Optionally, the fluid may be in a circulating flow to achieve an even better temperature control effect. Optionally, the fluid may be water, a mixture of water and glycol, or air.

[0117] In the above technical solution, the protective plate (8) is placed between the first wall and the battery (2) box, or the protective plate (8) is used directly as the battery (2) box to protect the battery (2) box from high temperature and airflow shock, and further protect the safety of the battery (2). A thermal management member for controlling the temperature of the battery cell (6) is provided between the first wall and the protective plate (8), so that the temperature of the battery cell (6) can be controlled according to the needs of the battery cell (6) to allow the battery cell (6) to operate normally.

[0118] Optionally, the thermal management member (66) is provided with a vulnerable area (661) positioned opposite the pressure reduction mechanism (65), and the vulnerable area (661) is configured to be destroyed by the discharge of the battery cell (6) when the pressure reduction mechanism (65) is operated so that the discharge passes through the vulnerable area (661).

[0119] The vulnerable area (661) may adopt various arrangements that facilitate destruction by the emitted material, and the embodiments of the present application are not limited thereto.

[0120] The thermal management member (66) may have a flow path formed of a thermally conductive material for fluid flow. As the fluid flows along the flow path, it conducts heat through the thermally conductive material to regulate the temperature of the battery cell (6). In an embodiment of the present application, the vulnerable area (661) will be easily damaged by an emitting substance by forming a thin layer of thermally conductive material with only the thermally conductive material and without fluid. For example, one side of the vulnerable area (661) near the bottom wall (202) may be a layer of thermally conductive material for forming the vulnerable area (661).

[0121] In the above technical solution, the protective plate (8) can be placed between the first wall and the box of the battery (2), or the protective plate (8) can be used directly as the box of the battery (2) to protect the safety of the battery (2). A thermal management member (66) is provided between the first wall and the protective plate (8) so that the temperature of the battery cell (6) can be controlled according to the actual needs of the battery cell (6) to ensure the normal function of the battery cell (6). A vulnerable area (661) is provided in the thermal management member (66) so that when the vulnerable area (661) is destroyed due to the impact of airflow or high temperature, the discharge passes through the vulnerable area (661) and is rapidly discharged outside the battery cell (6), thereby reducing the risk of discharge to the battery (2) and enhancing the safety performance of the battery (2).

[0122] FIG. 11 is a schematic separation structure diagram of the bottom wall of a battery according to another embodiment of the present application. As shown in FIG. 11, in one embodiment of the present application, an insulating member (67) is disposed between the protective plate (8) and the box (20).

[0123] In the above technical solution, by adding a protective plate (8) between the first wall and the box (20) where the pressure reducing mechanism (65) is placed, the box (20) of the battery (2) can be protected from the impact of high temperature and high-speed airflow. By additionally placing an insulating member (67) between the protective plate (8) and the box (20), the temperature of the box (20) can be further lowered and the safety of the battery (2) can be protected.

[0124] Optionally, the air absence (67) is an air intermediate layer.

[0125] Adding an insulating member (67) is intended to further lower the temperature of the box (20), and using an air intermediate layer as the insulating member (67) greatly reduces heat transfer from inside the battery (2) to the box (20), thereby making the insulating effect very significant.

[0126] In the above technical solution, by placing an air intermediate layer with an insulating member (67) between the protective plate (8) and the box (20), the temperature of the box (20) can be further lowered and the safety performance of the battery (2) can be enhanced.

[0127] FIG. 12 is a schematic structural diagram of a fiber-reinforced resin layer according to one embodiment of the present application. As shown in FIG. 12, optionally, the protective plate (8) includes a multilayer fiber-reinforced resin layer (81) formed compositely of a fiber material and a resin material.

[0128] In this application, no limitations are placed on the composite process between the fiber material and the resin material. For example, a fiber material layer (811) which is a single sheet can be immersed in a resin material slurry so that the resin material slurry sufficiently penetrates into the fiber pores (812) of the fiber material layer (811) which is a single sheet, and then baked for 3 to 30 minutes at a temperature of 60°C to 120°C to produce a fiber-reinforced resin layer (81). The fiber-reinforced resin layer (81) is laminated in 1 to 20 layers and hot-pressed under conditions of a pressure of 0.1 to 10 MPa and a temperature of 100 to 200°C to produce a protective plate (8).

[0129] The present application also makes no limitations on the method of manufacturing the resin material slurry. For example, in the embodiments of the present application, the resin material slurry may be composed of an aqueous elastic coating agent, a resin material, a flame retardant, a dispersant, a coupling agent, silica powder, and short fibers in a mass ratio of (35-55):(15-34):(15-20):(1-3):(0.5-3):(1-3):(0.5-3).

[0130] The fiber-reinforced resin material according to the embodiment of the present application is a material that has a dark brown color and excellent acid resistance, mechanical properties, and heat resistance, and can maintain structural integrity and dimensional stability even at very high temperatures, and is therefore widely used in corrosion prevention processes, adhesives, and flame retardants.

[0131] In the above technical solution, the fiber-reinforced resin is a material capable of withstanding high temperatures and impacts. A protective plate (8) made of such a material is placed between the pressure reduction mechanism (65) and the box (20). When high temperatures and ejected materials inside the battery cell (6) pour out of the battery cell (6) at high speed, the protective plate (8) can protect the box (20) from the impact of high-temperature melting and high-speed ejected materials, and further protect the safety of the battery (2).

[0132] Optionally, the resin material is a silicone-based aerogel-modified resin or a flame-retardant resin resistant to high temperatures.

[0133] The resin material in the embodiments of the present application may be a silicone-based aerogel-modified resin or a flame-retardant resin resistant to high temperatures.

[0134] In the above technical solution, the material composed of fibers and resin has heat resistance and impact resistance. By using a silicone-based aerogel modified resin or a flame-retardant resin that is resistant to high temperatures, the heat resistance and impact resistance of the protective plate (8) can be further improved.

[0135] Optionally, the fiber material may be at least one of fibers such as glass fiber, carbon fiber, quartz fiber, high silica fiber, aluminum silicate fiber, mullite fiber, silicon carbide fiber, silicon nitride fiber, alumina fiber, boron nitride fiber, basalt fiber, brucite fiber, attapulgite fiber, boron fiber, carbon nanotube, aramid fiber, polyimide fiber, ultra-high molecular weight polyethylene fiber, etc.

[0136] Optionally, the fiber material is a ceramic fiber material.

[0137] In the embodiments of the present application, the ceramic fiber has excellent heat resistance among various fiber materials.

[0138] In the above technical solution, the material composed of fibers and resins has heat resistance and impact resistance. Ceramic fiber materials have superior heat resistance compared to other fiber materials.

[0139] Optionally, the ceramic fiber material is silica or alumina.

[0140] In the above technical solution, the protective plate (8) made using silica or alumina has the best heat resistance.

[0141] Optionally, the fiber material has a thickness of 6 to 100 µm.

[0142] In the above technical solution, by using a fiber material with a thickness of 6 to 100 μm, the protective plate (8) can be made to have heat resistance and impact resistance, and production costs can also be reduced.

[0143] Optionally, the protective plate (8) has a thickness of 0.2 to 5 mm.

[0144] In the above technical solution, by using a protective plate (8) with a thickness of 0.2 to 5 mm, the protective plate (8) can be made to have heat resistance and impact resistance, and production costs can also be reduced.

[0145] An embodiment of the present application further provides an electric device comprising a battery (2) according to the above-described embodiment for supplying electric energy.

[0146] Hereinafter, embodiments of the present application will be described. The embodiments described below are illustrative and are intended merely to interpret the present application, not to be understood as limiting the present application. Where specific techniques or conditions are not indicated in the embodiments, they shall be in accordance with the techniques or conditions described in literature in the art or product specifications.

[0147] Tensile strength tests were performed on protective plates made of fiber-reinforced resin material, and the test results are shown in Table 1; compression strength tests were performed, and the test results are shown in Table 2; bending strength tests were performed, and the test results are shown in Table 3; beam cutting performance tests were performed, and the test results are shown in Table 4; and impact performance tests were performed, and the test results are shown in Table 5.

[0148] Tensile performance test of protective plates by thickness turn Maximum force (N) Tensile strength (Mpa) 3mm plate 3mm plate 2mm plate 0.5mm plate 1 7754.87 103.40 132.84 119.39 2 8067.78 107.57 150.31 130.16 3 8015.57 106.87 133.03 129.64 4 7273.17 96.98 141.91 132.23 5 8286.20 110.24 150.52 126.72 medium 7875.92 105.01 141.72 127.63 Standard deviation 383.46 5.11 8.74 5.01

[0149] Compression performance test of protective plates by thickness turn Compressive strength (Mpa) 3mm plate 2mm plate 0.8mm plate 1 83.74 166.02 133.19 2 83.91 177.34 124.68 3 84.13 171.78 133.99 4 84.69 153.86 154.05 5 84.61 167.63 122.91 6 85.47 136.05 133.71 7 85.95 175.54 128.99 8 84.49 166.40 99.25 9 85.61 154.28 152.93 10 85.56 176.49 - medium 84.22 165.54 131.52 Standard deviation 0.42 13.02 15.45

[0150] Flexural performance test of protective plates by thickness turn Flexural strength (Mpa) 3mm plate 2mm plate 0.7mm plate span 48mm 32mm 12mm 1 194.56 205.16 409.64 2 202.92 213.53 386.62 3 179.18 199.12 294.71 4 182.51 206.87 270.57 5 193.07 199.02 289.38 6 191.84 242.03 284.79 7 186.25 200.38 290.59 8 188.25 218.99 271.47 9 196.04 189.23 381.78 10 208.67 377.86 medium 190.51 208.30 325.74 Standard deviation 6.87 14.48 55.57

[0151] Beam cutting performance test of protective plates by thickness turn 3mm plate (span 12mm) 2mm plate (8mm span) Maximum force (N) Cutting strength (Mpa) Maximum force (N) Cutting strength (Mpa) 1 474.12 2.33 375.87 23.49 2 479.32 2.33 280.14 17.51 3 403.36 2.34 287.46 17.97 4 464.32 2.35 297.60 18.60 5 440.18 2.35 302.00 18.88 6 442.98 2.37 310.98 19.44 7 447.58 2.39 309.42 19.34 8 368.74 2.35 311.45 19.47 9 514.51 2.38 346.08 21.63 10 428.17 2.38 medium 446.328 2.35 313.45 19.59 Standard deviation 40.93 0.02 29.9 1.87

[0152] Impact performance test of protective plates by thickness turn Impact strength (KJ / m 2 ) 3mm plate 2mm plate 1 67.69 45.3 2 70.23 48.5 3 63.07 42.2 4 77.60 46.2 5 67.60 51.1 6 68.22 43.9 7 71.29 41.4 8 61.34 50 9 51.1 10 46.3 medium 68.38 46.6 Standard deviation 5.01 3.5

[0153] In addition, when the hardness of a protective plate with a thickness of 3 mm was measured, the Shore D hardness was 87 and the Barcol hardness was 46.

[0154] Although this application has been described with reference to preferred embodiments, various modifications may be made without departing from the scope of this application, and components may be replaced with equivalents. In particular, each technical feature mentioned in each embodiment may be combined in any manner, provided that no structural conflicts exist. This application is not limited to the specific embodiments disclosed herein but includes all technical solutions falling within the scope of the claims. Explanation of the symbols

[0155] 1: Vehicle 2: Battery 6: Battery cell 8: Protective plate 20: Box 61: Electrode assembly 62: Casing body 63: Electrode terminal 64: Connecting member 65: Pressure reducing mechanism 66: Thermal management element 67: Insulation element 81: Fiber-reinforced resin layer 811: Fiber material layer 812: Fiber pores 201: 1st box section / upper cover 202: Second Box Section / Floor Wall 203: Accommodation Space 621: Casing body 622: End cap 631: Positive terminal 632: Negative terminal 661: Vulnerable Area

Claims

Claim 1 A battery cell (6) having a pressure reducing mechanism (65) disposed on a first wall; and a protective plate (8) which is a polymer substrate composite fiber plate disposed opposite to the pressure reducing mechanism (65); wherein the battery cell (6) is contained within a box (20), the first wall is a wall of the battery cell (6) disposed near and opposite to the bottom wall (202) of the box (20), the protective plate (8) is disposed between the bottom wall (202) and the first wall, and a thermal management member (66) is disposed between the protective plate (8) and the first wall in which a fluid is contained to control the temperature of the battery cell (6) to contact the protective plate (8). Claim 2 A battery according to claim 1, characterized in that the polymer-based composite fiber board is a fiber-reinforced resin composite board. Claim 3 A battery according to claim 1, wherein the protective plate (8) is the same size as the bottom wall (202). Claim 4 A battery according to claim 1, wherein the protective plate (8) is smaller in size than the bottom wall (202). Claim 5 A battery according to claim 1, wherein the protective plate (8) is bar-shaped, and the projection of the protective plate (8) projected onto the first wall covers the pressure reduction mechanism (65). Claim 6 A battery according to claim 1, characterized in that the protective plate (8) is arranged to be integrated with the bottom wall (202) of the box (20). Claim 7 A battery according to claim 1, wherein the thermal management member (66) is provided with a vulnerable area (661) positioned opposite to the pressure reduction mechanism (65), and the vulnerable area (661) is configured to be destroyed by the discharge of the battery cell (6) when the pressure reduction mechanism (65) is operated, so that the discharge passes through the vulnerable area (661). Claim 8 A battery according to claim 1, characterized in that an insulating member (67) is disposed between the protective plate (8) and the box (20). Claim 9 A battery according to claim 8, wherein the insulating member (67) is an air intermediate layer. Claim 10 A battery according to claim 1, wherein the protective plate (8) comprises a multilayer fiber-reinforced resin layer (81) formed compositely from a fiber material and a resin material. Claim 11 A battery according to claim 10, wherein the resin material is a silicone-based aerogel modified resin or a flame-retardant resin resistant to high temperatures. Claim 12 A battery according to claim 10, wherein the fiber material is at least one of the following fibers: glass fiber, ceramic fiber, carbon fiber, quartz fiber, high silica fiber, aluminum silicate fiber, mullite fiber, silicon carbide fiber, silicon nitride fiber, alumina fiber, boron nitride fiber, basalt fiber, brucite fiber, attapulgite fiber, boron fiber, carbon nanotube fiber, aramid fiber, polyimide fiber, ultra-high molecular weight polyethylene fiber, etc. Claim 13 A battery characterized in that, in claim 12, the fiber material is a ceramic fiber material. Claim 14 A battery characterized in that, in claim 13, the ceramic fiber material is silica fiber or alumina fiber. Claim 15 A battery according to claim 10, wherein the fiber material has a thickness of 6 to 100 μm. Claim 16 A battery according to claim 1, wherein the protective plate (8) has a thickness of 0.2 to 5 mm. Claim 17 An electric device characterized by including a battery (2) according to any one of claims 1 to 16 for supplying electric energy. Claim 18 delete Claim 19 delete Claim 20 delete Claim 21 delete Claim 22 delete Claim 23 delete Claim 24 delete

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