Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment, the battery device comprises a plurality of battery monomers and a sampling assembly, the sampling assembly comprises a partition plate, a sampling piece and a protection piece, the partition plate is arranged at one side of the plurality of battery monomers, the sampling piece comprises a sampling main body and a connection part, and the sampling main body is located at one side of the partition plate back to the battery monomers; the connecting part is connected to the battery monomer, at least part of the protective part is arranged between the partition plate and the sampling main body, and the melting point of the protective part is higher than that of the partition plate. The battery device provided by the embodiment of the utility model can improve the reliability.

Description

Technical Field

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

[0002] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0003] The development of battery technology must take into account multiple design factors. For example, improving the reliability of battery devices is an important research direction in the battery field. Utility Model Content

[0004] This application provides a battery device and an electrical appliance that can improve the reliability of the battery device.

[0005] In a first aspect, this application provides a battery device including a plurality of battery cells and a sampling assembly; the sampling assembly includes a separator, a sampling element and a protective element, the separator is disposed on one side of the plurality of battery cells, the sampling element includes a sampling body and a connecting part, the sampling body is located on the side of the separator facing away from the battery cells, the connecting part is connected to the battery cells, at least a portion of the protective element is disposed between the separator and the sampling body, and the melting point of the protective element is higher than the melting point of the separator.

[0006] In the technical solution of this application embodiment, the battery device is provided with a battery cell and a sampling component for collecting data from the battery cell. The sampling component is provided with a protective component, which is sandwiched between the separator and the sampling component. This can protect the sampling component and reduce the impact of thermal runaway of the battery cell on the sampling component. In this way, the possibility of insulation layer damage, short circuit and arcing between battery cells caused by high temperature impact on the sampling component is reduced, thereby improving the reliability of the battery device.

[0007] According to some embodiments of this application, the sampling component further includes a connector, and the sampling body includes a first segment disposed on the separator and a second segment connected between the first segment and the connector; along the thickness direction of the separator, the orthographic projection of the first segment lies within the outline of the orthographic projection of the protective component. This allows the area of ​​the sampling component close to the battery cell to receive more complete protection, further improving reliability.

[0008] According to some embodiments of this application, the thickness of the protective component is 0.5mm-10mm. This allows the protective component to provide good protection while occupying a small space.

[0009] According to some embodiments of this application, the protective member is arranged circumferentially around the sampling body in the first segment. This allows the protective member to cover a larger surface area of ​​the sampling body, further improving the reliability of the protection.

[0010] According to some embodiments of this application, at least a portion of the surface of the protective component near the sampling body is spaced apart from the sampling body, and the maximum distance between the protective component and the sampling body in the radial direction is greater than or equal to 1.5 mm. This creates a certain air gap between the protective component and the sampling body, reducing heat conduction efficiency and further improving the reliability of the protection.

[0011] According to some embodiments of this application, the protective component includes a protective sleeve connected to the partition, and the sampling body is inserted inside the protective sleeve. The protective component can be in the form of a sleeve, which facilitates installation and limits the position of the sampling body.

[0012] According to some embodiments of this application, in the extension direction of the sampling body, the size of the protective sleeve is greater than or equal to the size of the first segment. This ensures that the protective sleeve completely covers the first segment, further improving the reliability of the protection.

[0013] According to some embodiments of this application, the protective component includes a protective strip that is wrapped around the sampling body. The protective component can take the form of a protective strip, which, through wrapping, ensures a tight connection between the protective strip and the sampling body, reducing the possibility of high-temperature gas contacting the sampling body.

[0014] According to some embodiments of this application, the protective tape covers the surface of the first section, and the protective tape is wound multiple times around the surface of the sampling body, with adjacent turns of the protective tape at least partially overlapping. This makes the protective tape wound more tightly, further reducing the possibility of high-temperature flue gas flowing in through gaps.

[0015] According to some embodiments of this application, the width of the protective strip is L1 in the extension direction of the sampling body, and adjacent loops of the protective strip have an overlapping area in the extension direction of the sampling body, the size of the overlapping area in the extension direction is L2; ​​L1 / 3≤L2≤L1 / 2. This ensures that every two adjacent loops of the protective strip have an appropriate overlap width, reducing the required length of the protective strip while maintaining reliable protection.

[0016] According to some embodiments of this application, the battery device includes multiple sampling elements, and the protective element includes a protective strap that wraps around the sampling bodies of the multiple sampling elements; or, the protective element includes multiple protective straps, with each protective strap corresponding to one of the multiple sampling elements. This makes the arrangement of the protective element more flexible, and the one-to-one correspondence between the protective straps and the sampling elements can further improve the reliability of the protection.

[0017] According to some embodiments of this application, the protective component includes a protective frame connected to a partition, with a first section housed within the protective frame. The rigidity of the protective frame is greater than that of the partition. By increasing the rigidity of the protective frame, its impact resistance can be improved.

[0018] According to some embodiments of this application, a protective frame is arranged around the sampling body; or, the protective frame includes a first wall, a second wall, and a third wall, with the first wall located between the sampling body and the partition, the second wall located between the sampling body and the pressure relief mechanism, and the third wall located on the side of the first wall facing away from the second wall, forming an opening between the second and third walls; or, the third wall located on the side of the second wall facing away from the first wall, forming an opening between the first and third walls. Protective elements are provided on both the sampling body and the direction facing the pressure relief mechanism and the partition, further improving the reliability of the protection.

[0019] According to some embodiments of this application, the protective component includes a bottom wall disposed between the sampling body and the separator, and a side wall connected to the bottom wall. The thickness of the bottom wall is greater than the thickness of the side wall, and the minimum difference between the thickness of the bottom wall and the thickness of the side wall is greater than or equal to 0.5 mm. Locally thickening the area of ​​the protective component near the separator and the battery cell further improves the reliability of the protection.

[0020] According to some embodiments of this application, the melting point of the protective component is greater than or equal to 500°C, and / or the thermal conductivity of the protective component is less than or equal to 1 W / (m·K). By adjusting the parameters of the protective component, it can achieve a good protective effect.

[0021] According to some embodiments of this application, the protective component is made of any one of polyimide, ceramic composite material, mica material, and glass fiber aerogel material. The protective component is made of a material that is heat-resistant, impact-resistant, and can be used as a flexible material.

[0022] Secondly, this application provides an electrical device including the battery device in any embodiment of the first aspect, the battery device being used to provide electrical energy. Attached Figure Description

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0024] Figure 1 A simplified schematic diagram of a vehicle provided for some embodiments of this application;

[0025] Figure 2Explosion-proof diagrams of battery devices provided in some embodiments of this application;

[0026] Figure 3 This is a partial structural schematic diagram of a battery device provided in some embodiments of this application;

[0027] Figure 4 This is a schematic diagram of the structure of the sampling component provided in some embodiments of this application;

[0028] Figure 5 This is a partial structural diagram of a sampling component provided in some embodiments of this application;

[0029] Figure 6 A partial structural schematic diagram of the sampling component provided in other embodiments of this application;

[0030] Figure 7 This is a schematic diagram of the structure of a sampling component provided in other embodiments of this application;

[0031] Figure 8 for Figure 7 A partial sectional view at point A-A' shown;

[0032] Figure 9 for Figure 7 Another partial sectional view at point A-A' shown;

[0033] Figure 10 for Figure 7 Another partial sectional view at point A-A' shown.

[0034] Figure label:

[0035] 1000 - Vehicles;

[0036] 100 - Battery device; 200 - Controller; 300 - Motor;

[0037] 10 - Battery cell; 20 - Sampling module; 30 - Housing;

[0038] 11-Pressure relief mechanism; 12-Electrode terminal; 21-Baffle; 22-Sampling component; 23-Protective component; 31-First housing section; 32-Second housing section; 33-Receiving section;

[0039] 221-Sampling body; 222-Connecting part; 223-First section; 224-Second section; 225-Connector; 231-Protective sleeve; 232-Protective belt; 233-Protective frame; 234-First wall; 235-Second wall; 236-Third wall;

[0040] X - Thickness direction. Detailed Implementation

[0041] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0043] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0044] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0045] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0046] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0047] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0048] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0049] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0050] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0051] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0052] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0053] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0054] As an example, the positive current collector can be a metal foil or a composite current collector.

[0055] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0056] As an example, the negative electrode current collector can be made of metal foil, foam metal, or composite current collector.

[0057] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0058] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0059] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0060] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0061] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0062] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0063] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0064] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0065] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel-like, or solid.

[0066] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0067] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0068] In some embodiments, the housing may be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect to the electrode assembly for outputting or inputting electrical energy into the battery cell.

[0069] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0070] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0071] In some embodiments, the battery device can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0072] In some embodiments, the battery device may be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0073] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0074] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0075] A battery pack typically contains multiple battery cells, which are electrically connected together in series, parallel, or mixed configurations, and then connected to external components. During testing or operation, it is usually necessary to collect low-voltage and / or high-voltage signals from each battery cell using sampling components to determine the operating status of the battery pack. These sampling components are typically electrically connected to the electrode terminals of the battery cells or to busbars used for electrical connections between adjacent battery cells, and are positioned between the battery cells and the housing.

[0076] In related technologies, the sampling harness in the sampling assembly has an insulating layer on its outer periphery to reduce the possibility of short circuits between multiple battery cells caused by the sampling harness. However, when thermal runaway occurs, the battery cells discharge high-temperature and high-pressure emissions from their own pressure relief mechanisms and other locations, which can easily cause the sampling harness to be subjected to greater impact and the insulating layer to be damaged by heat. This can lead to short circuits between the sampling harnesses, which can easily cause large-scale fires.

[0077] In view of this, the present application provides a technical solution that effectively improves the protection against high-temperature gas impact and other factors by setting a protective component between the sampling component and the separator located on the side of the sampling component closer to the battery cell, thereby improving the reliability of the battery device.

[0078] The technical solutions described in this application are applicable to battery devices and electrical equipment using battery devices. Electrical equipment includes, for example, mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools. Spacecraft include, for example, airplanes, rockets, space shuttles, and spacecraft. Electric toys include, for example, stationary or mobile electric toys, specifically, game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include, for example, metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, specifically, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0079] The battery cells described in this application are not limited to the electrical devices described above, but for the sake of brevity, the following embodiments are all illustrated using electric vehicles as an example.

[0080] Please see Figure 1 , Figure 1 This is a simplified schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 can be installed inside the vehicle 1000; specifically, for example, the battery device 100 can be installed at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 100 may also include a controller 200 and a motor 300. The controller 200, for example, is used to control the battery to supply power to the motor 300. The battery device 100 can be used for starting the vehicle 1000, navigation, etc. Of course, the battery can also be used to drive the vehicle 1000, replacing or partially replacing gasoline or natural gas to provide propulsion for the vehicle 1000.

[0081] Figure 2This is an exploded view of a battery device 100 provided in some embodiments of this application. For example... Figure 2 As shown, the battery device 100 includes a housing 30 and a battery cell 10, with the battery cell 10 housed within the housing 30.

[0082] The housing 30 is used to accommodate the battery cell 10, and the housing 30 can have various structures. In some embodiments, the housing 30 may include a first housing portion 31 and a second housing portion 32, which overlap each other, and together define a receiving portion 33 for accommodating the battery cell 10. The second housing portion 32 may be a hollow structure with one end open, and the first housing portion 31 may be a plate-like structure, with the first housing portion 31 covering the open side of the second housing portion 32 to form a housing 30 with the receiving portion 33; alternatively, both the first housing portion 31 and the second housing portion 32 may be hollow structures with one side open, with the open side of the first housing portion 31 covering the open side of the second housing portion 32 to form a housing 30 with the receiving portion 33. Of course, the first housing portion 31 and the second housing portion 32 can be various shapes, such as cylinders, cuboids, etc.

[0083] In a battery, there can be one or more battery cells 10. If there are multiple battery cells 10, they can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery cells 10 are connected in both series and parallel. Multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 10 is housed in the housing 30. Alternatively, multiple battery cells 10 can first be connected in series, in parallel, or in a mixed manner to form a battery module, and then multiple battery modules can be connected in series, in parallel, or in a mixed manner to form a whole assembly, which is then housed in the housing 30.

[0084] In some embodiments, there are multiple battery cells 10, which are first connected in series, parallel, or in a mixed manner to form a battery module. The multiple battery modules are then connected in series, parallel, or in a mixed manner to form a whole, which is housed in the housing 30.

[0085] Next, we will combine the appendix Figure 3 To be continued Figure 10 The structure of the battery device 100 and the electrical equipment is described.

[0086] Please refer to the following: Figure 3 and Figure 4 , Figure 3 This is a partial structural schematic diagram of the battery device 100 provided in some embodiments of this application. Figure 4 This is a schematic diagram of the structure of the sampling component 20 provided in some embodiments of this application.

[0087] In a first aspect, this application provides a battery device 100, including a plurality of battery cells 10 and a sampling assembly 20; the sampling assembly 20 includes a separator 21, a sampling element 22 and a protective element 23, the separator 21 is disposed on one side of the plurality of battery cells 10, the sampling element 22 includes a sampling body 221 and a connecting part 222, the sampling body 221 is located on the side of the separator 21 facing away from the battery cells 10, the connecting part 222 is connected to the battery cells 10, at least a portion of the protective element 23 is disposed between the separator 21 and the sampling body 221, and the melting point of the protective element 23 is higher than the melting point of the separator 21.

[0088] This application provides a battery device 100, including a plurality of battery cells 10 for performing charging and discharging functions and a sampling component 20 for collecting electrical signals from the battery cells 10. Optionally, the battery device 100 may further include a housing 30, which encloses a receiving portion 33. The battery cells 10 and the sampling component 20 may both be disposed in the housing 30, which provides protection and support functions.

[0089] The sampling assembly 20 includes a separator 21, a sampling element 22, and a protective element 23. The separator 21 is disposed between the sampling element 22 and the battery cell 10, and can be used to define the relative position of the sampling element 22 and the battery cell 10. Specifically, the separator 21 can be connected to the battery cell 10 or the housing 30, and the sampling element 22 can be disposed on the separator 21 and electrically connected to the battery cell 10, thereby indirectly defining the relative position between the sampling element 22 and the battery cell 10.

[0090] Optionally, the sampling element 22 may be positioned by the partition 21. In embodiments where multiple battery cells 10 are arranged in an array, the sampling element 22 may extend along the arrangement direction of at least a portion of the battery cells 10 and be connected to different battery cells 10 or electrical connectors between battery cells 10. Specifically, the sampling element 22 includes a sampling body 221 and a connecting portion 222. The sampling body 221 is disposed on the partition 21, and the orthographic projection of the partition 21 can cover the orthographic projection of the sampling body 221 along the thickness direction X of the partition 21. The connecting portion 222 extends outward from the sampling body 221, and may partially protrude from the edge of the partition 21, and is used for electrical connection with the battery cells 10 or a busbar.

[0091] Optionally, the sampling element 22 can be a sampling line or a sampling line bundle composed of multiple sampling lines. Each sampling line can include a section located in the sampling body 221 and a section constituting the connection part 222, so as to transmit the electrical signal at each battery cell 10 to the other end of the sampling element 22 through the sampling line, and optionally further transmit it to a component such as a battery control unit for monitoring the parameters of the battery device 100.

[0092] The protective component 23 is at least partially disposed between the partition 21 and the sampling body 221. The protective component 23 may be connected to the partition 21 and / or the sampling component 22, and may be made of a high-temperature resistant material with a high melting point to withstand the impact of high-temperature gas. The protective component 23 may be a plate-shaped component sandwiched between the partition 21 and the sampling body 221, or the protective component 23 may be a cylindrical component sleeved on the sampling body 221, etc.

[0093] In the battery device 100, if a single battery cell 10 experiences thermal runaway, high-temperature, high-pressure emissions will be released from locations such as the pressure relief mechanism 11. Therefore, by installing a high-temperature resistant protective component 23 between the separator 21 and the sampling element 22, the impact of the emissions on the sampling element 22 can be reduced, lowering the possibility of short circuits caused by insulation damage to the sampling element 22. Simultaneously, by installing the high-temperature resistant protective component 23, the heat transferred from the single battery cell 10 to the sampling element 22 during operation can be reduced, decreasing heat accumulation and further improving the reliability of the battery device 100.

[0094] In some embodiments, similar to the protection of the sampling body 221, the protective member 23 can extend to the side of the connection portion 222 near the battery cell 10, and can also provide a certain degree of protection for the connection portion 222 without affecting the electrical connection between the connection portion 222 and the battery cell 10 or the busbar.

[0095] In some optional embodiments, the sampling element 22 further includes a connector 225, and the sampling body 221 includes a first segment 223 disposed on the partition 21 and a second segment 224 connected between the first segment 223 and the connector 225; along the thickness direction X of the partition 21, the orthographic projection of the first segment 223 is located within the outline of the orthographic projection of the protective element 23.

[0096] Optionally, the sampling component 22 may also include a connector 225, which is used to electrically connect the sampling component 22 to external components of the sampling assembly 20 through plugging, overlapping, welding, or other means. For example, it may be electrically connected to a signal transmission line or directly connected to a battery control unit. The connector 225 and the connection part 222 may be respectively disposed on opposite ends of the sampling body 221 to transmit the signals collected from the battery cell 10 to the control unit for recording or analysis.

[0097] Furthermore, the sampling body 221 may include a first segment 223 and a second segment 224 arranged sequentially along its extension direction. The first segment 223 may be a portion of the sampling body 221 disposed on one side of the partition 21 and electrically connected to the connecting part 222. The second segment 224 may be a portion of the sampling body 221 connected between one end of the first segment 223 and the connector 225. The length of the second segment 224 may be designed according to the first segment 223 and the spacing between the partition 21 and the connector 225 to be connected.

[0098] Optionally, in embodiments where the sampling component 20 includes multiple sampling elements 22, the second segments 224 of these sampling elements 22 may be grouped into the same harness to make their positions more regular and reduce the possibility of the sampling elements 22 tangling together.

[0099] In the embodiment where the sampling body 221 includes a first segment 223 and a second segment 224, the orthographic projection of the protective member 23 along the thickness direction X of the separator 21 can cover the orthographic projection of the first segment 223. That is, protective members 23 can be optionally provided at each point between the first segment 223 and the separator 21, so that the protection of the sampling member 22 from the side closer to the battery cell 10 is more reliable, further reducing the possibility of the insulation layer of the sampling member 22 being damaged during thermal runaway, and further improving the overall reliability of the battery device 100.

[0100] In some alternative embodiments, the thickness of the protective element 23 is 0.5mm-10mm.

[0101] Optionally, the thickness of the protective component 23 can be selected to be between 0.5mm and 10mm, and further selected to be between 1mm and 10mm. For example, it can be selected to be any one of 1mm, 3mm, 5mm, 7mm, 9mm, 10mm or between any two of them. Specifically, it can be designed according to parameters such as the specific spray valve strength, emission temperature and thermal insulation performance of the protective component 23 when the battery cell 10 is thermally runaway.

[0102] It is understood that the thickness of the protective element 23 here refers to the dimension of the protective element 23 at each location in the thickness direction X. For example, in the embodiment where the protective element 23 is in a cylindrical or U-shaped structure and is arranged around the sampling element 22, the thickness of the protective element 23 refers to the layer thickness and wall thickness at each location, rather than the overall extension dimension of the protective element 23 in the thickness direction X of the partition 21.

[0103] By setting the thickness of the protective component 23 within this range, the protective component 23 can occupy less space while having a relatively good protective effect, reducing the possibility of the energy density of the battery device 100 decreasing due to the protective component 23 being too thick, and the possibility of the protective component 23 being too thin causing it to be melted by high-temperature gas and its heat insulation performance to decrease.

[0104] In some alternative embodiments, the protective element 23 is disposed around the sampling body 221 in the circumferential direction of the first segment 223.

[0105] Optionally, the protective element 23 may extend at least partially along the circumference of the first segment 223 and surround the sampling body 221, or it may partially surround the sampling body 221, or it may be cylindrical and completely surround the first segment 223.

[0106] Within a cross section perpendicular to the extension direction of the first segment 223, the sampling component 20 forms a cross-sectional shape. In this cross-sectional shape, the cross-sectional shape of the protective member 23 can be selected to start from the area between the sampling member 22 and the partition 21 and extend to at least one side along the circumference of the first segment 223, so that the protective member 23 can have a larger area in the radial direction of the first segment 223, thereby protecting a larger surface area on the sampling body 221.

[0107] During the thermal runaway of the battery cell 10, high-temperature gas may diffuse into the battery device 100 after being ejected. Therefore, there is a possibility that the outer peripheral surface of the sampling body 221 may come into contact with the high-temperature gas. Based on this, by setting the protective component 23 at least partially around the first segment 223, the effective protective area on the outer peripheral surface of the first segment 223 can be increased, thereby further improving the reliability of protection and the overall reliability of the battery device 100.

[0108] In some alternative embodiments, the protective member 23 is at least partially spaced from the sampling body 221 on the side surface near the sampling body 221, and the maximum distance between the protective member 23 and the sampling body 221 in the radial direction is greater than or equal to 1.5 mm.

[0109] Optionally, in embodiments where the protective member 23 is at least partially disposed around the sampling body 221, the protective member 23 may be at least partially spaced from the sampling body 221, that is, at least a portion of the inner wall of the protective member 23 may be spaced from the outer peripheral surface of the sampling body 221 as an air gap of a certain thickness.

[0110] Specifically, to ensure that the protective element 23 is at least partially spaced from the sampling body 221, the inner cavity formed by the protective element 23 can have a large cross-sectional area, so that only the bottom of the sampling body 221 contacts the interior of the protective element 23, thus forming the sampling body 221, while the top and sides can be spaced apart from the protective element 23. Alternatively, based on the large cross-sectional area of ​​the inner cavity of the protective element 23, a support structure can be provided in the cavity to support the sampling body 221, thereby further reducing the contact area between the sampling body 221 and the inner wall of the protective element 23. The support structure can be a small support frame made of high-temperature resistant material, and can be bonded, pressed, snapped, or integrally formed with the protective element 23.

[0111] Since air has low thermal conductivity, by setting a certain air gap between the protective component 23 and the sampling component 20, the thermal conductivity can be reduced, the heat transferred to the protective component 23 can be further reduced, and the reliability of protection can be further improved.

[0112] In some alternative embodiments, the protective element 23 includes a protective sleeve 231 connected to the partition 21, and the sampling body 221 is inserted inside the protective sleeve 231.

[0113] Optionally, the protective element 23 may be in the form of a sleeve, surrounding the sampling body 221 and fitting the sampling body 221 therein. The protective sleeve 231 may be configured to conform to the shape of the sampling body 221. For example, in an embodiment where the sampling body 221 is cylindrical, the protective sleeve 231 may be correspondingly cylindrical.

[0114] The protective sleeve 231 may extend in the same direction as the partition 21 and the sampling body 221. The wall of the protective sleeve 231 may have a through hole for the connecting part 222 to pass through. Optionally, the diameter of the sleeve may be the same or similar at various points along its extension direction to facilitate processing and installation. Alternatively, the sampling assembly 20 may include multiple sampling lines, which may have different lengths and connect to different battery cells 10 or busbars. In this embodiment, the sum of the cross-sectional areas of the sampling element 22 is different, and the diameter of the protective sleeve 231 may also change accordingly.

[0115] Setting the protective component 23 as a sleeve fitted onto the sampling body 221 facilitates its installation and limits the position of the sampling body 221.

[0116] In some alternative embodiments, the size of the protective sleeve 231 is greater than or equal to the size of the first segment 223 in the extending direction of the sampling body 221.

[0117] In the embodiment where the protective component 23 is a protective sleeve 231, the protective sleeve 231 extends in the same direction as the sampling body 221. In the extension direction of both, the protective sleeve 231 may have an extension dimension greater than or equal to that of the first segment 223. Furthermore, the protective sleeve 231 can completely cover the first segment 223. That is, the orthographic projection of the first segment 223 along its own radial direction can be selected to overlap with the orthographic projection of the protective sleeve 231, so that the protective sleeve 231 can provide a tight and reliable protective effect for the sampling component 22.

[0118] Optionally, in embodiments with connector 225 and second segment 224, protective sleeve 231 can cover both first segment 223 and second segment 224 to further improve the reliability of protection for sampling component 22.

[0119] Please refer to the following: Figure 5 and Figure 6 , Figure 5 This is a partial structural diagram of the sampling component 20 provided in some embodiments of this application. Figure 6 This is a partial structural schematic diagram of the sampling component 20 provided in some other embodiments of this application. In some optional embodiments, the protective member 23 includes a protective strip 232, which is wrapped around the sampling body 221.

[0120] Optionally, the protective element 23 can also be configured as a flexible strip structure and wrapped around the outer peripheral surface of the sampling element 22 to form a protective layer structure that fits tightly against the sampling body 221. In this embodiment, the protective strip 232 can be configured as multiple sequentially connected loop structures wrapped around the outer peripheral surface of the sampling body 221, with adjacent loop structures being connected or partially overlapping, and the connecting portion 222 extending from the gap between two adjacent loop structures.

[0121] By setting the protective component 23 as a protective strip 232, the protective strip 232 can be tightly connected to the outer peripheral surface of the sampling body 221 by wrapping, forming a relatively tight protective layer on the outside of the sampling body 221, further reducing the possibility of high temperature gas contacting the sampling body 221.

[0122] In some alternative embodiments, the protective strip 232 covers the surface of the first segment 223 and is wound around the surface of the sampling body 221 in multiple turns, with adjacent turns of the protective strip 232 at least partially overlapping.

[0123] Optionally, in order for the protective strip 232 to cover the surface of the sampling body 221, the protective strip 232 can extend along the circumference of the sampling body 221 and be wrapped in multiple loops. Each loop of the protective strip 232 is offset by a certain distance relative to the previous loop along the extension direction of the sampling body 221, until the protective strip 232 extends from one end of the first segment 223 to the other end.

[0124] Based on this, adjacent protective strips 232 can have overlapping areas, that is, except for the first strip at the end, each other protective strip 232 partially overlaps the adjacent protective strip 232, so that the protective strip 232 is wrapped more tightly, reducing the possibility of the outer peripheral surface of the sampling body 221 being exposed due to the loosening or misalignment of the protective strip 232, and at the same time reducing the possibility of high temperature gas flowing in through the gaps in the protective strip 232, thereby improving the reliability of protection.

[0125] In some optional embodiments, the width of the protective strip 232 is L1 in the extension direction of the sampling body 221, and two adjacent protective strips 232 have an overlapping area in the extension direction of the sampling body 221, the size of the overlapping area in the extension direction is L2; ​​L1 / 3≤L2≤L1 / 2.

[0126] As described above, in the embodiment where the protective tape 232 is wrapped around the sampling body 221 in multiple turns, the dimension of the protective tape 232 in the extending direction of the sampling body 221 is denoted as L1. Optionally, the width of the protective tape 232 at all points can be the same or similar. After the protective tape 232 is wrapped around the sampling body 221, the inclination angle of each turn of the protective tape 232 can be the same or similar. Thus, the dimension of the protective tape 232 at all points in the extending direction of the sampling body 221 can be the same or similar, and this dimension is denoted as L1.

[0127] Similarly, there is an overlapping area between every two adjacent protective strips 232. The size of this overlapping area in the extension direction of the sampling body 221 is denoted as L2. L2 should be between 1 / 3 and 1 / 2 of L1 so that the width of the overlapping area is appropriate.

[0128] By defining the proportional relationship between the overlapping area and the width of the protective strip 232, each pair of adjacent protective strips 232 can have an appropriate overlap width, thereby reducing the length of the protective strip 232 required to cover the sampling body 221 while ensuring reliable protection, and reducing the cost of the protective component 23.

[0129] In some optional embodiments, the battery device 100 includes a plurality of sampling elements 22, and the protective element 23 includes a protective strip 232, which wraps around the sampling bodies 221 of the plurality of sampling elements 22; or, the protective element 23 includes a plurality of protective strips 232, which are arranged one-to-one with the plurality of sampling elements 22.

[0130] As previously mentioned, the sampling element 22 can be a single sampling line or a sampling line bundle composed of multiple sampling lines. Simultaneously, the sampling assembly 20 can include multiple sampling elements 22, which can be selected to collect electrical signals from battery cells 10 at different locations. Based on this, when wrapping the protective tape 232, multiple sampling elements 22 can be wrapped in the same protective layer to reduce the cost of the protective element 23 and save space; alternatively, the protective tape 232 can be configured one-to-one with the sampling elements 22 and wrapped separately for protection. The number of sampling lines included in each sampling element 22 can be the same or different to further improve the reliability of the protection.

[0131] Optionally, in an embodiment where the protective strips 232 and the sampling elements 22 are configured in a one-to-one correspondence, each sampling element 22 may be provided with a sampling line, that is, multiple protective strips 232 may be selected to be wrapped around each sampling line respectively, so as to further improve the reliability of protection.

[0132] Please refer to the following: Figures 7 to 10 , Figure 7 This is a schematic diagram of the structure of the sampling component 20 provided in other embodiments of this application. Figure 8 for Figure 7 A partial sectional view at point A-A' shown. Figure 9 for Figure 7 Another partial sectional view at point A-A' shown. Figure 10 for Figure 7 Another partial sectional view at point A-A' shown.

[0133] In some alternative embodiments, the protective element 23 includes a protective frame 233 connected to the partition 21, a first segment 223 being accommodated in the protective frame 233, and the hardness of the protective frame 233 being greater than the hardness of the partition 21.

[0134] Optionally, the protective element 23 can also adopt a rigid frame structure, specifically a rigid tubular structure disposed on the partition 21. This tubular structure can be configured to surround the sampling body 221, or it can be configured to surround at least a portion of the sides of the sampling body 221. In a cross-section perpendicular to the extending direction of the sampling body 221, the cross-sectional shape formed by the protective frame 233 can be U-shaped, rectangular, circular, polygonal, etc., and its cross-sectional area can be designed according to the cross-sectional area of ​​the sampling body 221.

[0135] Optionally, based on the fact that the melting point of the protective component 23 is higher than that of the partition 21, the protective component 23 can also have a higher hardness than the partition 21, so as to provide good heat resistance, flame retardancy and impact resistance, and reduce the possibility of the insulation layer of the sampling body 221 being damaged by heat or impact.

[0136] In some alternative embodiments, the protective frame 233 is arranged around the sampling body 221; or, the protective frame 233 includes a first wall 234, a second wall 235 and a third wall 236, the first wall 234 is located between the sampling body 221 and the partition 21, the second wall 235 is located between the sampling body 221 and the pressure relief mechanism 11, and the third wall 236 is located on the side of the first wall 234 away from the second wall 235, with an opening formed between the second wall 235 and the third wall 236; or, the third wall 236 is located on the side of the second wall 235 away from the first wall 234, with an opening formed between the first wall 234 and the third wall 236.

[0137] Optionally, in an embodiment where the protective element 23 is configured as a protective frame 233, the cross-sectional shape of the protective frame 233 can be annular and surround the cross-sectional shape of the sampling body 221, or the cross-sectional shape of the protective frame 233 can be U-shaped, that is, the protective frame 233 has an opening on one of its side walls. By providing an opening, the weight of the protective element 23 can be reduced, and the protective element 23 and the sampling element 22 can be more easily connected to each other.

[0138] Optionally, the protective frame 233 can be a cuboid in shape and have an opening on one of its side walls that extends in the same direction as the sampling body 221. In this case, the cross-sectional shape of the protective frame 233 is a U-shape with adjacent sides perpendicular to each other. The opening can be offset from both the direction of the sampling body 221 toward the partition 21 and the direction of the pressure relief mechanism 11 of the battery cell 10.

[0139] For example, the pressure relief mechanism 11 of the battery cell 10 can be disposed on the top surface of the end cap in the same way as its electrode terminal 12, that is, disposed on the side surface of the battery cell 10 facing the separator 21. In this embodiment, the sampling body 221 is provided with a protective frame 233 on the bottom facing the separator 21 and on the side and lower side facing the pressure relief mechanism 11. The opening of the protective frame 233 is disposed in other directions besides the two directions mentioned above.

[0140] Specifically, the protective frame 233 may include a first wall 234, a second wall 235, and a third wall 236. These walls may be connected end-to-end to form a structure with a U-shaped or C-shaped cross-section. The first wall 234 is sandwiched between the partition 21 and the sampling body 2211, and the second wall 235 is disposed between the pressure relief mechanism 11 and the sampling body 221. The first wall 234 and the second wall 235 are interconnected. The third wall 236 may be connected to one of the two ends of the first wall 234 and the second wall 235 away from each other, so that the opening of the protective frame 233 is located on the side of the sampling assembly 20 away from the partition 21 or away from the pressure relief mechanism 11.

[0141] By adjusting the opening direction of the protective frame 233, the possibility of high-temperature flue gas directly entering and dislodging the sampling body 221 through the opening can be reduced, thereby achieving good protective performance while reducing weight.

[0142] In some optional embodiments, the protective element 23 includes a bottom wall disposed between the sampling body 221 and the partition 21 and a side wall connected to the bottom wall, wherein the thickness of the bottom wall is greater than the thickness of the side wall, and the minimum difference between the thickness of the bottom wall and the thickness of the side wall is greater than or equal to 0.5 mm.

[0143] The bottom wall may include a first wall 234, and the side walls may include a second wall 235 and a third wall 236. That is, the thickness of the first wall 234 is greater than the thickness of the second wall 235 and the third wall 236, and the minimum difference is greater than or equal to 0.5 mm.

[0144] Optionally, in embodiments where the protective component 23 takes the form of a protective frame 233, the various walls of the protective frame 233 may have different thicknesses. Specifically, the side closest to the separator 21 may be thickened to further improve the protective performance of that side. Since the side facing the separator 21 is closer to the battery cell 10, in the event of thermal runaway, high-temperature flue gas is likely to approach the sampling body 221 from that direction. Therefore, the protective frame 233 on that side may be specifically thickened to improve the ability of that location to resist the impact of high-temperature airflow, thereby further improving the overall reliability of the battery device 100.

[0145] In some optional embodiments, the melting point of the protective element 23 is greater than or equal to 500°C, and the thermal conductivity of the protective element 23 is less than or equal to 1 W / (m·K).

[0146] To ensure reliable protection, the protective component 23 should have a high melting point and low thermal conductivity. Specifically, the melting point of the protective component 23 can be greater than or equal to 500°C, so that it can remain unmelted or only partially melted during the process of thermal runaway of the battery cell 10 and the emission of high-temperature and high-pressure gases.

[0147] It is understood that the protective element 23 can be made of various materials, such as by applying a fire-retardant coating to a substrate, or by, for example, by laminating multiple materials. In such embodiments, the protective element 23 may partially have a melting point greater than or equal to 500°C, provided that this portion of the refractory material is evenly distributed and at least completely covers the side of the sampling element 22 facing the partition 21.

[0148] Furthermore, the thermal conductivity of the protective component 23 can be less than or equal to 1 W / (m·K). By reducing the thermal conductivity of the protective component 23, the heat transferred to the sampling body 221 can be reduced during the operation of the battery device 100 and in the event of thermal runaway. At the same time, the impact of high-temperature flue gas on the sampling component 22 can be reduced, further improving the reliability of the battery device 100.

[0149] In some alternative embodiments, the material of the protective element 23 includes any one of polyimide, ceramic composite material, mica material, and glass fiber aerogel material.

[0150] Based on meeting the aforementioned parameter standards, the protective component 23 can be made of high-temperature resistant materials such as polyimide (PI), ceramic composite materials, mica materials, and glass fiber aerogel. Specifically, polyimide has good insulation properties and is easy to conform to the shape of the sampling component 22; ceramic composite materials can include flexible ceramic fiber materials, ceramicized silicone rubber, etc.; mica has good high-temperature resistance and insulation properties, and can provide reliable heat insulation and flame retardant functions; aerogel materials have small pores, and the air flow efficiency on the aerogel is low. At the same time, the aerogel itself has a high specific heat capacity and good heat insulation properties. In addition to glass fiber aerogel, ceramic fiber aerogel can also be used, all of which can enable the protective component 23 to have good protective effects.

[0151] By using the aforementioned materials to make the protective component 23, the protective component 23 can have good heat insulation and flame retardant properties, improving the reliability of protection, and also making the protective component 23 lighter, thereby increasing the overall energy density of the battery device 100. At the same time, depending on the different manufacturing processes, the above materials can all have a certain degree of flexibility, which makes it easy to conform the protective component 23 to the sampling body 221 and facilitates installation.

[0152] Secondly, this application provides an electrical device including a battery device 100 as described in any embodiment of the second aspect, the battery device 100 being used to provide electrical energy.

[0153] The electrical device in this embodiment has all the beneficial effects of the battery device 100 in the first aspect. For details, please refer to the specific description of the battery device 100 in the above embodiments. This embodiment will not repeat the description here.

[0154] This application provides a battery device 100, including a plurality of battery cells 10 and a sampling assembly 20. The sampling assembly 20 includes a separator 21, a sampling element 22, and a protective element 23. The separator 21 is disposed on one side of the plurality of battery cells 10. The sampling element 22 includes a sampling body 221 and a connecting part 222. The sampling body 221 is located on the side of the separator 21 facing away from the battery cells 10. The connecting part 222 is connected to the battery cells 10. At least a portion of the protective element 23 is disposed between the separator 21 and the sampling body 221. The melting point of the protective element 23 is higher than the melting point of the separator 21.

[0155] The sampling component 22 also includes a connector 225, and the sampling body 221 includes a first segment 223 disposed on the partition 21 and a second segment 224 connected between the first segment 223 and the connector 225; along the thickness direction X of the partition 21, the orthographic projection of the first segment 223 is located within the outline of the orthographic projection of the protective component 23, and the protective component 23 is disposed around the sampling body 221 in the circumferential direction of the first segment 223.

[0156] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Multiple battery cells; A sampling assembly includes a separator, a sampling component, and a protective component. The separator is disposed on one side of the plurality of battery cells. The sampling component includes a sampling body and a connecting part. The sampling body is located on the side of the separator facing away from the battery cell. The connecting part is connected to the battery cell. At least a portion of the protective component is disposed between the separator and the sampling body. The melting point of the protective component is higher than that of the separator.

2. The battery device according to claim 1, characterized in that, The sampling component further includes a connector, and the sampling body includes a first section disposed on the partition and a second section connected between the first section and the connector; Along the thickness direction of the partition, the orthographic projection of the first segment lies within the outline of the orthographic projection of the protective component.

3. The battery device according to claim 2, characterized in that, The thickness of the protective component is 0.5mm-10mm.

4. The battery device according to claim 2, characterized in that, The protective component is arranged around the sampling body in the circumferential direction of the first segment.

5. The battery device according to claim 4, characterized in that, The protective component is at least partially spaced from the sampling body on the side surface closest to the sampling body, and the maximum distance between the protective component and the sampling body in the radial direction is greater than or equal to 1.5 mm.

6. The battery device according to claim 4, characterized in that, The protective component includes a protective sleeve, which is connected to the partition, and the sampling body is inserted inside the protective sleeve.

7. The battery device according to claim 6, characterized in that, In the extending direction of the sampling body, the size of the protective sleeve is greater than or equal to the size of the first segment.

8. The battery device according to claim 4, characterized in that, The protective component includes a protective strip, which is wrapped around the sampling body.

9. The battery device according to claim 8, characterized in that, The protective strip covers the surface of the first section and is wound around the surface of the sampling body in multiple turns, with adjacent turns of the protective strip being at least partially overlapped.

10. The battery device according to claim 9, characterized in that, In the extending direction of the sampling body, the width of the protective strip is L1, and two adjacent loops of the protective strip have an overlapping area in the extending direction of the sampling body, the size of the overlapping area in the extending direction is L2; L1 / 3≤L2≤L1 / 2.

11. The battery device according to claim 9, characterized in that, The battery device includes multiple sampling elements, and the protective element includes a protective strap that wraps around the sampling bodies of all the multiple sampling elements; or, The protective component includes multiple protective straps, each of which is configured to correspond one-to-one with one of the sampling components.

12. The battery device according to claim 4, characterized in that, The protective component includes a protective frame connected to the partition, the first segment being housed within the protective frame, and the hardness of the protective frame being greater than that of the partition.

13. The battery device according to claim 12, characterized in that, The protective frame surrounds the sampling body; or... The battery cell is equipped with a pressure relief mechanism. The protective frame includes a first wall, a second wall, and a third wall. The first wall is located between the sampling body and the partition. The second wall is located between the sampling body and the pressure relief mechanism. The third wall is located on the side of the first wall away from the second wall. An opening is formed between the second wall and the third wall. Alternatively, the third wall is located on the side of the second wall away from the first wall, and an opening is formed between the first wall and the third wall.

14. The battery device according to claim 12, characterized in that, The protective component includes a bottom wall disposed between the sampling body and the partition and a side wall connected to the bottom wall. The thickness of the bottom wall is greater than the thickness of the side wall, and the minimum difference between the thickness of the bottom wall and the thickness of the side wall is greater than or equal to 0.5 mm.

15. The battery device according to any one of claims 1 to 14, characterized in that, The melting point of the protective component is greater than or equal to 500°C; and / or the thermal conductivity of the protective component is less than or equal to 1 W / (m·K).

16. The battery device according to any one of claims 1 to 14, characterized in that, The protective component is made of any of the following materials: polyimide, ceramic composite material, mica material, and glass fiber aerogel material.

17. An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1-16, the battery device being used to provide electrical energy.

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