Battery cell, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly, a shell, a pressure relief mechanism, a first insulating part and a filtering part, the shell forms a containing cavity with an opening, the electrode assembly is located in the containing cavity, and a cover body covers the opening; the first insulating part is connected to the surface, facing the electrode assembly, of the cover body, the first insulating part is provided with a first leading-out channel, and the containing cavity is communicated with the pressure relief mechanism through the first leading-out channel. The filter part is arranged on one side, facing the electrode assembly, of the cover body, is connected to the first insulating part and covers the opening of the first lead-out channel, and the filter screen of the filter part is provided with the high-temperature-resistant coating, so that when the battery monomer is subjected to thermal runaway, high-temperature discharged substances are discharged outwards; the solid particles of the high-temperature discharged substance can be filtered by the filtering piece and are not easy to be discharged out of the battery monomer, so that the high-temperature solid particles are not easy to ignite inflammable gas in the high-temperature discharged substance outside the battery monomer, and the reliability of the battery monomer is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery device, in particular to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] The battery device has the advantages of high specific energy and high power density, and is widely used in electronic equipment and vehicles, such as mobile phones, notebook computers, electric vehicles, electric vehicles, electric aircraft, electric ships and electric tools.

[0003] With the continuous expansion of the application range of the battery device, people's requirements for the battery device are also getting higher and higher. How to improve the reliability of the battery device is more and more concerned by the technical personnel in the field. CONTENT OF THE INVENTION

[0004] In view of the above problems, the present application provides a battery monomer, a battery device and a power utilization device, which has high reliability.

[0005] In a first aspect, the present application provides a battery monomer, which comprises an electrode assembly, a shell, a pressure relief mechanism, a first insulating piece and a filter piece. The shell comprises a shell body and a cover body. The shell body forms a cavity with an opening. The electrode assembly is located in the cavity. The cover body covers the opening. The pressure relief mechanism is arranged on the cover body. The first insulating piece is connected to the surface of the cover body facing the electrode assembly. The first insulating piece is provided with a first lead-out channel, which communicates the cavity with the pressure relief mechanism. The filter piece is located on the side of the cover body facing the electrode assembly. The filter piece is connected to the first insulating piece and covers the opening of the first lead-out channel. The filter piece comprises a filter screen provided with a high-temperature-resistant coating.

[0006] In the above structure, since the filter piece is arranged on the side of the cover body facing the electrode assembly, and the filter piece is connected to the first insulating piece and covers the opening of the first lead-out channel, when the battery monomer is in thermal runaway and high-temperature venting substances are discharged outward, the solid particles in the high-temperature venting substances are filtered by the filter piece and are not easily discharged outward, so that the solid particles at high temperature are not easy to ignite the flammable gas in the high-temperature venting substances outside the battery monomer, thereby improving the reliability of the battery monomer. In addition, since the filter screen is provided with a high-temperature-resistant coating, the filter screen is not easy to deform when it is in a high-temperature state due to the impact of the venting substances at high temperature, so that the filter screen still has good separation effect on the solid particles and the venting gas at high temperature.

[0007] According to the battery cell provided by some embodiments of the present application, the filter has a filter channel, and an equivalent diameter of the filter channel is set as D, 20 μm≤D≤1000 μm. The filter channel not only enables the gas in the release substance to smoothly pass through the filter channel to reach the pressure relief mechanism, so that the gas in the release substance is subjected to smaller resistance, but also enables the solid particles in the release substance to be effectively filtered and retained, thereby reducing the amount of the solid particles discharged to the outside of the battery cell, and reducing the possibility that the solid particles ignite the combustible gas in the release substance discharged to the outside of the battery cell.

[0008] According to the battery cell provided by some embodiments of the present application, the orthographic projection of the pressure relief mechanism is located in the range of the orthographic projection of the filter along the thickness direction of the cover body. The filter has a larger developed area, and can realize comprehensive coverage of the pressure relief mechanism, so that all the release substance flowing through the pressure relief mechanism can pass through the filter, which is beneficial to reducing the content of the solid particles in the release substance discharged to the outside of the battery cell, and is beneficial to improving the filtering effect of the filter on the solid particles in the release substance.

[0009] According to the battery cell provided by some embodiments of the present application, the surface of the first insulating member facing the cover body is provided with a groove, and at least part of the filter is arranged in the groove. The first lead-out channel is communicated with the bottom surface of the groove, so that at least part of the filter located in the groove can cover the opening of the first lead-out channel, and the filter can filter the release substance discharged from the opening of the first lead-out channel.

[0010] According to the battery cell provided by some embodiments of the present application, the filter is provided with a connecting hole penetrating through the filter along the thickness direction of the cover body. The bottom surface of the groove is provided with a connecting structure, and the connecting structure is clamped in the connecting hole. The connection of the filter and the first insulating member is convenient and fast, and the assembly efficiency of the filter on the first insulating member is improved.

[0011] According to the battery cell provided by some embodiments of the present application, the connecting structure includes a protruding part and a limiting part connected with each other. The protruding part is connected with the bottom surface of the groove, and the protruding part extends from the connecting hole. The limiting part is protruded on the outer peripheral surface of the part of the protruding part extending out of the connecting hole. The limiting part is arranged outside the surface of the filter away from the bottom surface of the groove. The limiting part can block the filter from the side of the filter away from the bottom surface of the groove, so that the filter is not easy to fall off from the protruding part. The clamping of the connecting hole and the connecting structure is realized, and the reliability of the connection of the filter and the first insulating member is improved.

[0012] According to the battery cell provided by some embodiments of the present application, the protruding part and the cover body are relatively spaced apart along the thickness direction of the cover body, so that the entire filter can be located in the groove and relatively spaced apart from the cover body.

[0013] According to the battery cell provided by some embodiments of the present application, the filter further comprises at least one of a porous solid medium structure and a loose-packed medium structure.

[0014] According to the battery cell provided by some embodiments of the present application, the heat-resistant temperature of the high-temperature-resistant coating is E, 1000℃≤E≤1500℃, which not only makes the filter screen provided with the high-temperature-resistant coating not easy to deform when impacted by the high-temperature discharge material, but also makes the cost of the high-temperature-resistant coating not easy to be too high, thereby being beneficial to reducing the cost of the filter screen.

[0015] According to the battery cell provided by some embodiments of the present application, the first insulation member comprises a main body part and a first protrusion protruding from the main body part to the electrode assembly, the main body part is connected to the surface of the cover body facing the electrode assembly, the first protrusion abuts against the electrode assembly to form a gap between the main body part and the electrode assembly, and the first lead-out channel is in communication with the pressure relief mechanism, so that the discharge material in the battery cell can smoothly pass through the gap to the first lead-out channel, thereby being beneficial to improving the smoothness of the discharge material in the battery cell.

[0016] According to the battery cell provided by some embodiments of the present application, along the length direction of the cover body, the first lead-out channel penetrates through the first protrusion, so that the discharge material in the gap on both sides of the first protrusion in the length direction of the cover body can smoothly pass to the first lead-out channel.

[0017] According to the battery cell provided by some embodiments of the present application, the first insulation member further comprises at least two second protrusions protruding from the main body part to the electrode assembly, the second protrusions abut against the electrode assembly, the at least two second protrusions are arranged on both sides of the first protrusion in the length direction of the cover body, and the second protrusions are provided with a second lead-out channel, along the length direction of the cover body, the second lead-out channel penetrates through the second protrusions.

[0018] According to the battery cell provided by some embodiments of the present application, the filter has a filter channel, and the shape of the cross section of the filter channel is configured as a polygon, a circle or an ellipse.

[0019] In the second aspect, the present application provides a battery device, which comprises the battery cell provided by any of the technical solutions.

[0020] In the third aspect, the present application provides a power utilization device, which comprises the battery device provided by any of the technical solutions, and the battery device is used for providing electric energy.

[0021] The technical solutions provided by the embodiments of the present application at least bring the following beneficial effects:

[0022] The application provides a battery monomer, which comprises an electrode assembly, a shell, a pressure relief mechanism, a first insulating piece and a filter piece, the shell comprises a shell body and a cover body, the shell body forms a cavity with an opening, the electrode assembly is located in the cavity, and the cover body covers the opening; the pressure relief mechanism is arranged on the cover body; the first insulating piece is connected to a surface of the cover body facing the electrode assembly, the first insulating piece is provided with a first lead-out channel, and the first lead-out channel is in communication with the cavity and the pressure relief mechanism; the filter piece is located on a side of the cover body facing the electrode assembly, and is connected to the first insulating piece and covers an opening of the first lead-out channel; the filter piece comprises a filter screen, and the filter screen is provided with a high-temperature-resistant coating. In the above structure, since the filter piece is arranged on the side of the cover body facing the electrode assembly, and the filter piece is connected to the first insulating piece and covers the opening of the first lead-out channel, when the battery monomer is in thermal runaway and high-temperature venting substances are discharged outward, solid particles in the high-temperature venting substances are filtered by the filter piece and are not easy to be discharged outward, so that the solid particles at high temperature are not easy to ignite flammable gas in the high-temperature venting substances outside the battery monomer, and the reliability of the battery monomer is improved. In addition, since the filter screen is provided with the high-temperature-resistant coating, the filter screen is not easy to deform when being impacted by the venting substances at high temperature and being in a high-temperature state, so that the filter screen still has a good separation effect on the solid particles and the venting gas at high temperature.

[0023] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, the application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Furthermore, the same reference numerals in the various drawings indicate the same or similar components.

[0025] Figure 1 A structural schematic diagram of a vehicle provided by some embodiments of the application;

[0026] Figure 2 A split view of a battery device provided by some embodiments of the application;

[0027] Figure 3 A split view of a battery monomer provided by some embodiments of the application;

[0028] Figure 4 A structural schematic diagram of a battery monomer provided by some embodiments of the application;

[0029] Figure 5 Split view of part of structure in a battery cell provided by some embodiments of the present application;

[0030] Figure 6 Split view of part of structure in a battery cell provided by some embodiments of the present application;

[0031] Figure 7 Split view of part of structure in a battery cell provided by some embodiments of the present application;

[0032] Figure 8 Split view of part of structure in a battery cell provided by some embodiments of the present application; Figure 7 Enlarged view at F in the above figure.

[0033] In the drawings:

[0034] 1, vehicle; 2, battery device; 3, controller; 4, motor; 5, box; 5a, first box part; 5b, second box part; 5c, accommodation space; 7, battery cell; 8, electrode assembly; 9, housing; 90, cavity; 91, shell; 92, cover; 10, pressure relief mechanism; 11, first insulating part; 111, first lead-through passage; 112, groove; 113, connecting structure; 1131, protrusion; 1132, limiting part; 114, main body part; 115, first protrusion; 116, second protrusion; 1161, second lead-through passage; 117, gap; 12, filter part; 121, connecting hole. DETAILED DESCRIPTION

[0035] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0036] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by the skilled person in the field to which the embodiments of the present application belong.

[0037] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0038] In addition, the technical terms "first", "second" and the like are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implying the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more (including two), unless otherwise explicitly specified and limited.

[0039] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0040] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0041] At present, from the development of market situation, the application of battery device is more and more widely. The battery device is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields.

[0042] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cell assemblies to provide higher voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel or mixed connection through a busbar component.

[0043] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0044] The battery cell can be a secondary battery cell, which refers to a battery cell that can be activated by charging after discharging the battery cell.

[0045] The battery cell can be a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead-acid battery cell, etc.

[0046] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting while allowing the active ions to pass through.

[0047] In some embodiments, the battery cell further includes an electrolyte, which functions to conduct ions between the positive electrode and the negative electrode. The type of electrolyte is not specifically limited in the present application and can be selected as needed.

[0048] In some embodiments, the electrode assembly can be in a jelly-roll structure, a stacked structure, or a hybrid structure of jelly-roll and stacked.

[0049] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate the electrode assembly and other components such as electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (e.g., polypropylene), a composite metal shell (e.g., a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0050] As an example, the battery cell can be a prismatic battery cell, including a square cell, a blade cell, a multi-prismatic battery cell (e.g., a hexagonal prismatic battery cell), etc. In the embodiments of the present application, the battery cell is a blade cell.

[0051] In some embodiments, the housing includes a cover and a shell, the shell is provided with an opening, and the cover is provided on the opening. The shell can be provided with one or more openings. The cover can also be provided with one or more openings.

[0052] The battery device mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a hybrid manner through a busbar component.

[0053] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0054] As an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0055] In some embodiments, the battery device can be a battery pack, which includes a box and one or more battery cell assemblies housed in the box.

[0056] As an example, the battery cell assembly can be a battery module, which can be housed in the box by securing the battery module in the box.

[0057] As an example, the battery cell assembly can also be housed in the box by securing a plurality of battery cells directly in the box.

[0058] As an example, the box can include a first box and a second box. The first box and the second box are fastened so that an enclosed space is formed inside the box to receive the battery cell assembly. Here, enclosed means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0059] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame so that an enclosed space is formed inside the box to receive the battery cell assembly.

[0060] In some embodiments, the box can be part of a chassis structure of a vehicle. For example, part of the box can be at least part of a floor of the vehicle, or part of the box can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0061] In some embodiments, the battery device can be used in an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0062] Generally, a pressure relief mechanism is provided on the shell of the battery cell. When the internal pressure of the battery cell exceeds a preset temperature, the pressure relief mechanism is actuated to release the internal pressure and temperature of the battery cell. As an example, if there is thermal abuse or mechanical abuse during use of the battery cell, it is easy to cause thermal runaway to occur. When the battery cell experiences thermal runaway, hydrogen, carbon monoxide, and alkane gases are generated inside the battery cell, and the temperature and pressure inside the battery cell increase sharply during thermal runaway. On the one hand, the adhesion effect of the active material inside the battery cell becomes poor, and the gases accompanying thermal runaway are easily discharged outside the battery cell; on the other hand, aluminum beads generated by thermal melting of the aluminum foil inside the battery cell at high temperature are also easily carried out of the battery cell along with the thermal runaway gases. Since the air outside the battery cell has sufficient oxygen, the high-temperature solid particles ejected during thermal runaway are easy to ignite the hydrogen, carbon monoxide, and alkane gases discharged during thermal runaway, which seriously affects the reliability of the battery cell.

[0063] In order to improve the reliability of the battery cell, the battery cell provided by the application comprises an electrode assembly, a shell, a pressure relief mechanism, a first insulating piece and a filter piece, the shell comprises a shell body and a cover body, the shell body forms a cavity with an opening, the electrode assembly is located in the cavity, and the cover body covers the opening; the pressure relief mechanism is arranged on the cover body; the first insulating piece is connected to the surface of the cover body facing the electrode assembly, the first insulating piece is provided with a first lead-out channel, and the first lead-out channel communicates the cavity with the pressure relief mechanism; the filter piece is located on the side of the cover body facing the electrode assembly, and the filter piece is connected to the first insulating piece and covers the opening of the first lead-out channel; the filter piece comprises a filter screen, and the filter screen is provided with a high-temperature-resistant coating. In the above structure, since the filter piece is arranged on the side of the cover body facing the electrode assembly, and the filter piece is connected to the first insulating piece and covers the opening of the first lead-out channel, when the battery cell is in thermal runaway and high-temperature venting substances are discharged outward, the solid particles in the high-temperature venting substances are filtered by the filter piece and are not easily discharged outward, so that the solid particles at high temperature are not easy to ignite the flammable gas in the high-temperature venting substances outside the battery cell, and the reliability of the battery cell is improved. In addition, since the filter screen is provided with a high-temperature-resistant coating, the filter screen is not easy to deform when it is in a high-temperature state due to the impact of the high-temperature venting substances, so that the filter screen still has a good separation effect on the solid particles and the venting gas at high temperature.

[0064] The battery cell described in the embodiments of the application is suitable for a battery device and a power consumption device using the battery device.

[0065] The power consumption device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc.

[0066] The following embodiments take a vehicle as an example for convenient description.

[0067] Figure 1 The structure schematic diagram of the vehicle provided by some embodiments of the application is shown.

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

[0069] The vehicle 1 can further include a controller 3 and a motor 4, the controller 3 being used to control the battery device 2 to supply power to the motor 4, for example, for the power demand of the vehicle 1 during starting, navigation and driving.

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

[0071] Figure 2 A split view of the battery device provided in some embodiments of the present application is shown. As shown, the battery device 2 includes a box body 5 and a battery cell 7, the battery cell 7 being contained in the box body 5. The battery cell 7 can be the smallest unit constituting a battery. Figure 2

[0072] The box body 5 is used to contain the battery cell 7, and the box body 5 can be of various structures. In some embodiments, the box body 5 can include a first box body part 5a and a second box body part 5b, the first box body part 5a and the second box body part 5b being mutually coverable, and the first box body part 5a and the second box body part 5b together defining a containing space 5c for containing the battery cell 7. The second box body part 5b can be a hollow structure with one end open, and the first box body part 5a can be a plate-like structure, the first box body part 5a being coverable on the open end of the second box body part 5b to form the box body 5 with the containing space 5c; or the first box body part 5a and the second box body part 5b can both be hollow structures with one side open, the open side of the first box body part 5a being coverable on the open side of the second box body part 5b to form the box body 5 with the containing space 5c. Of course, the first box body part 5a and the second box body part 5b can be of various shapes, such as a cylinder, a cuboid, etc.

[0073] To improve the sealing performance of the first box body part 5a and the second box body part 5b after being connected, a sealing member, such as sealing glue, a sealing ring, etc., can be arranged between the first box body part 5a and the second box body part 5b.

[0074] Supposing that the first box body part 5a is coverable on the top of the second box body part 5b, the first box body part 5a can also be referred to as an upper box cover, and the second box body part 5b can also be referred to as a lower box body.

[0075] ​In the battery device 2, the battery cell 7 can be one or multiple. If the battery cell 7 is multiple, the multiple battery cells 7 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that the multiple battery cells 7 are connected in series and in parallel. The multiple battery cells 7 can be directly connected in series, in parallel, or in a mixed connection, and the whole of the multiple battery cells 7 can be accommodated in the case 5. Alternatively, the multiple battery cells 7 can be connected in series, in parallel, or in a mixed connection to form a battery module, and the multiple battery modules can be connected in series, in parallel, or in a mixed connection to form a whole, which can be accommodated in the case 5.

[0076] Some embodiments of the present application provide a battery cell, referring to Figure 3 、 Figure 4 and Figure 5 , the battery cell 7 includes an electrode assembly 8, a housing 9, a pressure relief mechanism 10, a first insulating member 11, and a filter member 12. The housing 9 includes a shell 91 and a cover 92, the shell 91 forms a cavity 90 with an opening, the electrode assembly 8 is located in the cavity 90, and the cover 92 covers the opening. The pressure relief mechanism 10 is arranged on the cover 92. Referring to Figure 6 and Figure 7 , the first insulating member 11 is connected to a surface of the cover 92 facing the electrode assembly 8, and the first insulating member 11 is provided with a first lead-out passage 111, which connects the cavity 90 and the pressure relief mechanism 10. The filter member 12 is located on a side of the cover 92 facing the electrode assembly 8, and the filter member 12 is connected to the first insulating member 11 and covers the opening of the first lead-out passage 111. The filter member 12 includes a filter screen, and the filter screen is provided with a high-temperature-resistant coating (not shown in the figure).

[0077] The electrode assembly 8 is a component in which electrochemical reactions occur in the battery cell 7. One or more electrode assemblies 8 can be contained in the housing 9. The electrode assembly 8 can include a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet and the negative electrode sheet can serve as a positive electrode and a negative electrode, respectively. During the charging and discharging process of the battery cell 7, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode sheet and the negative electrode sheet, and is used to isolate the positive electrode sheet and the negative electrode sheet. The separator can prevent the positive and negative electrodes from short-circuiting, and can also allow the active ions to pass through.

[0078] The housing 9 can be a component for enclosing a sealed space in the battery cell 7, and is used to accommodate the electrode assembly 8 and other components in the battery cell 7.

[0079] The shell 91 and the cover 92 are two parts of the housing 9 connected to each other. The shell 91 encloses a cavity 90 with an opening at one end, which not only allows the electrode assembly 8, the first insulation member 11, the filter member 12 and other components to be arranged in the cavity 90, but also allows the electrode assembly 8 and other components to be conveniently loaded into the cavity 90 from the opening. The cover 92 can be a part for sealing the opening, which is sealed to the shell 91 to form a sealed space in the cavity 90. The cover 92 is sealed to the opening, which can be that the cover 92 is welded to the shell 91 to seal the opening.

[0080] The pressure relief mechanism 10 can be a mechanism for releasing the pressure or temperature inside the battery cell 7. By arranging the pressure relief mechanism 10 on the cover 92, the battery cell 7 can discharge the release material outward through the pressure relief mechanism 10 on the cover 92.

[0081] As an example, the pressure relief mechanism 10 is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 7 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 7 reaches the predetermined threshold, the pressure relief mechanism 10 performs an action or a weak structure provided in the pressure relief mechanism 10 is broken, thereby forming an opening or a passage for the internal pressure or temperature to be released. The threshold value is designed differently according to different design requirements. The threshold value can depend on the material of one or more of the positive plate, the negative plate, the electrolyte and the separator in the battery cell 7.

[0082] As an example, the pressure relief mechanism 10 can be integrally formed with the cover 92.

[0083] As an example, the pressure relief mechanism 10 can also be arranged separately from the cover 92 and connected to the cover 92.

[0084] The "actuation" mentioned in the present application refers to the pressure relief mechanism 10 generating an action or being activated to a certain state, so that the substances inside the battery cell 7 are released, and the internal pressure and temperature are released. The action generated by the pressure relief mechanism 10 can include but is not limited to: the components in the pressure relief mechanism 10 moving to form an exhaust passage, at least a part of the pressure relief mechanism 10 breaking, crushing, tearing or opening, etc. When the pressure relief mechanism 10 is actuated, the high-temperature and high-pressure substances inside the battery cell 7 will be discharged outward from the actuated part as release material. In this way, the battery cell 7 can be pressure released and temperature released under controllable pressure or temperature, thereby reducing the occurrence of potentially more serious accidents.

[0085] In some embodiments, when the housing 9 is a non-sealed structure, the pressure relief mechanism 10 can be arranged as a through hole for discharging the gas inside the battery cell 7.

[0086] The discharge substance from the battery cell 7 mentioned in the present application includes, but is not limited to, electrolyte, positive and negative electrode sheet particles or fragments dissolved or broken, separator particles or fragments, high-temperature and high-pressure gas generated by reaction, flame, etc.

[0087] The first insulation member 11 can be an insulation member arranged on the side of the cover 92 facing the electrode assembly 8, which is used to insulate and separate the cover 92 from the electrode assembly 8 and other devices in the cavity 90. The first lead-out channel 111 can be a channel arranged in the first insulation member 11 for the discharge substance to pass through, which communicates the cavity 90 with the pressure relief mechanism 10, so that the discharge substance can be smoothly discharged to the outside of the battery cell 7 through the discharge mechanism.

[0088] The filter member 12 can be a member for filtering the discharge substance, which is used to filter and retain the solid particles in the discharge substance, reducing the possibility of their discharge to the outside of the battery cell 7.

[0089] By arranging the filter member 12 on the side of the cover 92 facing the electrode assembly 8, the filter member 12 is installed inside the cavity 90. The filter member 12 is connected to the first insulation member 11, which can mean that the filter member 12 is connected to the first insulation member 11 by connecting bolts, rivets, etc. connecting members, or that the filter member 12 is connected to the first insulation member 11 by welding, bonding or clamping.

[0090] By covering the opening of the first lead-out channel 111 with the filter member 12, the discharge substance will flow through the filter member 12 during its flow from the first lead-out channel 111 to the pressure relief mechanism 10, so that the solid particles in the discharge substance will be filtered and retained by the filter member 12, and the solid particles will not easily be discharged from the pressure relief mechanism 10 to the outside of the battery cell 7, reducing the possibility of the solid particles igniting the discharge substance discharged to the outside of the battery cell 7.

[0091] The filter screen can be a mesh member in a planar state, which is provided with a plurality of mesh holes that can serve as filter channels through which gas can pass without easily passing solid particles in the discharge substance.

[0092] By making the filter member 12 include a filter screen, the filter member 12 is a mesh member in a planar state. The high-temperature resistant coating can mean a coating structure that is not easily deformed at high temperature. By providing the filter screen with a high-temperature resistant coating, the filter screen is not easily deformed when it is in a high-temperature state due to the impact of high-temperature discharge substance, so that the filter screen still has good separation effect on solid particles and discharge gas at high temperature.

[0093] In the above structure, since a filter element 12 is provided on the side of the cover body 92 facing the electrode assembly 8, and the filter element 12 is connected to the first insulating element 11 and covers the opening of the first outlet channel 111, when the battery cell 7 has a thermal runaway and discharges high-temperature discharge material to the outside, the high-temperature discharge material will be discharged through the first outlet channel 111 and the pressure relief mechanism 10. During the process, the solid particles in the high-temperature discharge material will be filtered by the filter element 12 and are not easily discharged outside the battery cell 7, so that the high-temperature solid particles are not easy to ignite the flammable gas in the high-temperature discharge material outside the battery cell 7, thereby improving the reliability of the battery cell 7.

[0094] In some embodiments, the filter element 12 has a filter channel, and the equivalent diameter of the filter channel is set to D, 20 μm≤D≤1000 μm.

[0095] The filter channel can be a channel formed in the filter element 12 for passing the gas in the leaked substance, which allows the gas in the leaked substance to pass through the filter element 12 through the filter channel, so that the gas in the leaked substance can smoothly enter the discharge mechanism from the first outlet channel 111 so as to be discharged outside the battery cell 7.

[0096] By setting the range of the equivalent diameter D of the filter channel to 20μm≤D≤1000μm, not only can the gas in the released material pass through the filter channel smoothly to reach the pressure relief mechanism 10, so that the gas in the released material is subject to less resistance, but also the solid particles in the released material can be effectively filtered and retained, reducing the amount of solid particles discharged outside the battery cell 7, thereby reducing the possibility of solid particles igniting the combustible gas in the released material discharged outside the battery cell 7.

[0097] The range of the equivalent diameter D of the filter channel can be set to 100μm≤D≤800μm. For example, the equivalent diameter D of the filter channel can be set to 100μm, 200μm, 300μm, 400μm, 500μm, 600μm, 700μm or 800μm, so that the gas in the leaked material can pass through the filter element 12 smoothly with less resistance, and the solid particles in the leaked material can be effectively filtered and retained, reducing the possibility of solid particles igniting combustible gas in the leaked material discharged to the outside of the battery cell 7.

[0098] In some embodiments, along the thickness direction of the cover 92 , the orthographic projection of the pressure relief mechanism 10 is located within the range of the orthographic projection of the filter element 12 .

[0099] By locating the orthographic projection of the pressure relief mechanism 10 along the thickness direction of the cover 92 within the range of the orthographic projection of the filter element 12 along the thickness direction of the cover 92, the filter element 12 has a larger developed area, which can achieve overall coverage of the pressure relief mechanism 10, so that all the release substances flowing through the pressure relief mechanism 10 can pass through the filter element 12 for filtration, which is beneficial to reduce the content of solid particles in the release substances discharged to the outside of the battery monomer 7, and is beneficial to improve the filtration effect of the filter element 12 on the solid particles in the release substances.

[0100] In some embodiments, with reference to Figure 8 The surface of the first insulating member 11 facing the cover 92 is provided with a groove 112, and at least part of the filter element 12 is arranged in the groove 112, and the first lead-out channel 111 is communicated with the bottom surface of the groove 112.

[0101] The groove 112 can be a slot structure for providing a mounting space for the installation of the filter element 12. The groove 112 can be formed by inwardly recessing the surface of the first insulating member 11 facing the cover 92, so that the groove 112 is shaped on the surface of the first insulating member 11 facing the cover 92.

[0102] Exemplarily, the groove 112 can be formed on the surface of the first insulating member 11 facing the cover 92 by mechanical processing.

[0103] Arranging at least part of the filter element 12 in the groove 112 can mean that part of the filter element 12 is arranged in the groove 112, and the other part of the filter element 12 extends out of the groove 112; it can also mean that the entire filter element 12 is arranged in the groove 112.

[0104] By arranging at least part of the filter element 12 in the groove 112, the filter element 12 can be limited by the groove 112, which achieves positioning of the filter element 12 on the first insulating member 11, and is beneficial to reduce the possibility of the filter element 12 falling off the first insulating member 11.

[0105] Exemplarily, the opening of the groove 112 covers the pressure relief mechanism 10. By covering the pressure relief mechanism 10 with the opening of the groove 112, the filter element 12 fixed by the groove 112 can cover the pressure relief mechanism 10.

[0106] The first lead-out channel 111 is communicated with the bottom surface of the groove 112, which can mean that the opening of the first lead-out channel 111 is arranged on the bottom surface of the groove 112, so that at least part of the filter element 12 located in the groove 112 can cover the opening of the first lead-out channel 111, so that the filter element 12 can filter the release substances discharged from the opening of the first lead-out channel 111.

[0107] In some embodiments, the filter piece 12 is provided with a connecting hole 121 penetrating through the filter piece 12 along the thickness direction of the cover body 92, and the bottom surface of the groove 112 is provided with a connecting structure 113 clamped in the connecting hole 121.

[0108] The connecting hole 121 can be a hole structure provided on the filter piece 12 for connecting with the first insulating piece 11. The connecting hole 121 penetrating through the filter piece 12 along the thickness direction of the cover body 92 can mean that the connecting hole 121 is a through hole and penetrates through the entire filter piece 12 along the thickness direction of the cover body 92.

[0109] The connecting structure 113 can be a structure provided on the first insulating piece 11 for connecting with the filter piece 12. By arranging the connecting structure 113 on the bottom surface of the groove 112, the filter piece 12 located at least partially in the groove 112 can be connected with the first insulating piece 11 through the connection with the connecting structure 113.

[0110] By arranging the connection between the connecting structure 113 and the connecting hole 121 as clamping, the connection between the filter piece 12 and the first insulating piece 11 is convenient and fast, which is beneficial to improve the assembly efficiency of the filter piece 12 on the first insulating piece 11.

[0111] In some embodiments, the connecting structure 113 includes a protruding part 1131 and a limiting part 1132 connected with each other, the protruding part 1131 is connected to the bottom surface of the groove 112, the protruding part 1131 extends out of the connecting hole 121, the limiting part 1132 is protruded on the outer peripheral surface of the part of the protruding part 1131 extending out of the connecting hole 121, and the limiting part 1132 is arranged outside the surface of the filter piece 12 away from the bottom surface of the groove 112.

[0112] The protruding part 1131 and the limiting part 1132 are two parts connected with each other in the connecting structure 113. The protruding part 1131 is a structure connected to the bottom surface of the groove 112, so that the connecting structure 113 can protrude from the bottom surface of the groove 112, and the limiting part 1132 can be a structure protruding from the outer peripheral surface of the protruding part 1131, which is used to block and limit the filter piece 12, so that the filter piece 12 is separated from the connecting structure 113.

[0113] By making the protruding part 1131 pass through the connecting hole 121 and extend out of the connecting hole 121, and making the limiting part 1132 protrude on the outer peripheral surface of the part of the protruding part 1131 extending out of the connecting hole 121, the limiting part 1132 can be arranged outside the surface of the filter piece 12 away from the bottom surface of the groove 112, so that the limiting part 1132 can block the filter piece 12 from the side of the filter piece 12 away from the bottom surface of the groove 112, so that the filter piece 12 is not easy to fall off from the protruding part 1131, realizing the clamping of the connecting hole 121 and the connecting structure 113, and being beneficial to the reliability of the connection between the filter piece 12 and the first insulating piece 11.

[0114] In some embodiments, the protrusion 1131 is arranged opposite to the cover 92 along the thickness direction of the cover 92.

[0115] The protrusion 1131 arranged opposite to the cover 92 along the thickness direction of the cover 92 can mean that the end surface of the protrusion 1131 away from the bottom surface of the groove 112 in the thickness direction of the cover 92 is arranged opposite to the cover 92, so that the entire filter element 12 can be located in the groove 112 and arranged opposite to the cover 92.

[0116] In some embodiments, the filter element 12 further comprises at least one of a porous solid medium structure and a loose-packed medium structure.

[0117] The porous solid medium structure can be a rigid porous planar structure in the form of a sheet, which has uniform micropore channels capable of passing gas as a filtering channel without easily passing solid particles in the released substance. The loose-packed medium structure can be a filtering structure in the form of a sheet layer formed by loose packing of particles or fibers, which has uniform microslit channels capable of passing gas as a filtering channel without easily passing solid particles in the released substance.

[0118] The filter element 12 further comprising at least one of a porous solid medium structure and a loose-packed medium structure can mean that the filter element 12 further comprises a porous solid medium structure or a loose-packed medium structure; can also mean that the filter element 12 comprises a filtering net and a porous solid medium structure arranged in layers, a filtering net and a loose-packed medium structure arranged in layers; can also mean that the filter element 12 comprises a filtering net, a porous solid medium structure and a loose-packed medium structure arranged in layers.

[0119] In some embodiments, the heat-resistant temperature of the high-temperature-resistant coating is E, 1000℃≤E≤1500℃.

[0120] The heat-resistant temperature of the high-temperature-resistant coating can mean the highest temperature at which the high-temperature-resistant coating can safely and reliably withstand without failure, permanent deformation, significant performance degradation or safety risk under certain conditions. By setting the heat-resistant temperature E of the high-temperature-resistant coating in the range of 1000℃≤E≤1500℃, not only does the filtering net provided with the high-temperature-resistant coating not easily deform when impacted by the released substance at high temperature, but also the cost of the high-temperature-resistant coating is not easily too high, which is conducive to reducing the cost of the filtering net.

[0121] The heat-resistant temperature E of the high-temperature-resistant coating can be set to 1200℃≤E≤1400℃. For example, the heat-resistant temperature E of the high-temperature-resistant coating can be set to 1200℃, 1300℃ or 1400℃, so that the filter screen is not easy to deform when subjected to the impact of the high-temperature release substance, while having a lower cost, which is conducive to reducing the cost of the battery cell 7.

[0122] For example, the heat-resistant temperature of the high-temperature-resistant coating can be determined according to the national standard GB / T 30825-2014, and the specific determination method can refer to the national standard GB / T 30825-2014, which will not be described here.

[0123] In some embodiments, the high-temperature-resistant coating can be formed by coating a mixture of silica powder, magnesium oxide and sodium silicate on the surface of the metal screen, and then sintering twice at high temperature to form the high-temperature-resistant coating.

[0124] In some embodiments, the first insulating part 11 includes a main body part 114 and a first protrusion 115 protruding from the main body part 114 towards the electrode assembly 8. The main body part 114 is connected to the surface of the cover 92 facing the electrode assembly 8. The first protrusion 115 abuts against the electrode assembly 8 to form a gap 117 between the main body part 114 and the electrode assembly 8. The first lead-out channel 111 communicates the gap 117 with the pressure relief mechanism 10.

[0125] The main body part 114 can be the main structure in the first insulating part 11, which is connected to the surface of the cover 92 facing the electrode assembly 8.

[0126] The main body part 114 can be connected to the surface of the cover 92 facing the electrode assembly 8 by hot melt connection, so that the first insulating part 11 is firmly connected to the cover 92.

[0127] The first protrusion 115 can be a structure protruding from the main body part 114 towards the electrode assembly 8. The first protrusion 115 abuts against the electrode assembly 8, so that the main body part 114 can form a gap 117 with the electrode assembly 8. By making the first lead-out channel 111 communicate the gap 117 with the pressure relief mechanism 10, the release substance in the battery cell 7 can smoothly pass through the gap 117 to the first lead-out channel 111, which is conducive to improving the smoothness of the release of the release substance in the battery cell 7.

[0128] In some embodiments, the first lead-out channel 111 penetrates the first protrusion 115 along the length direction of the cover 92.

[0129] By penetrating the first lead-out channel 111 through the first protrusion 115 along the length direction of the cover body 92, the gap 117 on both sides of the first protrusion 115 in the length direction of the cover body 92 can be communicated through the first lead-out channel 111, and the discharge substance in the gap 117 on both sides of the first protrusion 115 in the length direction of the cover body 92 can smoothly pass into the first lead-out channel 111.

[0130] In some embodiments, the first insulating member 11 further comprises at least two second protrusions 116 protruding from the main body portion 114 to the electrode assembly 8, the second protrusions 116 abutting against the electrode assembly 8, the at least two second protrusions 116 being arranged on both sides of the first protrusion 115 in the length direction of the cover body 92, and the second protrusions 116 being provided with second lead-out channels 1161 penetrating the second protrusions 116 along the length direction of the cover body 92.

[0131] The second protrusions 116 can be structures protruding from the main body portion 114 to the electrode assembly 8, which are used to abut against the electrode assembly 8 and help form the gap 117 between the main body portion 114 and the electrode assembly 8 together with the first protrusion 115.

[0132] By arranging the at least two second protrusions 116 on both sides of the first protrusion 115 in the length direction of the cover body 92, the second protrusions 116 can support the gap 117 on both sides of the first protrusion 115 in the length direction of the cover body 92, so that the gap 117 formed between the main body portion 114 and the electrode assembly 8 is stable in shape, and the discharge substance can smoothly enter the first lead-out channel 111 through the gap 117.

[0133] The second lead-out channel 1161 can be a channel formed on the second protrusion 116 for passing the discharge substance. By arranging the second lead-out channel 1161 on the second protrusion 116 and penetrating the second lead-out channel 1161 through the second protrusion 116 along the length direction of the cover body 92, the discharge substance on both sides of the battery cell 7 in the length direction of the cover body 92 can smoothly enter the gap 117 through the second lead-out channel 1161, so as to pass into the first lead-out channel 111.

[0134] In some embodiments, the filter member 12 has filter channels, and the cross-sectional shape of the filter channels is configured as a polygon, a circle or an ellipse.

[0135] The cross-sectional shape of the filter channels being configured as a polygon, a circle or an ellipse can mean that the cross-sectional shape of all the filter channels in the filter member 12 is configured as a polygon, a circle or an ellipse; or can mean that the cross-sectional shape of a part of the filter channels is configured as a polygon, the cross-sectional shape of a part of the filter channels is configured as a circle, and the cross-sectional shape of another part of the filter channels is configured as an ellipse.

[0136] In the case of the same equivalent diameter of the cross section of the filtering channel, the filtering channels with different cross section shapes have different filtering diameters for the solid particles, and the cross section shape of the filtering channel can be set by the person skilled in the art according to the actual situation.

[0137] Some embodiments of the present application also provide a battery device 2 comprising the battery cell 7 provided by the technical solution described above. Since the battery device 2 comprises the battery cell 7 provided by the technical solution described above, the battery device 2 has higher reliability.

[0138] Some embodiments of the present application also provide a power consumption device comprising the battery device 2 provided by the technical solution described above, and the battery device 2 is used to provide electric energy.

[0139] The power consumption device can be the device or system of any of the application battery devices 2 described above.

[0140] Some embodiments of the present application provide a battery cell 7 comprising an electrode assembly 8, an outer shell 9, a pressure relief mechanism 10 and a filter 12, a cavity 90 with an opening is formed in a shell 91 of the outer shell 9, the electrode assembly 8 is located in the cavity 90, a cover 92 of the outer shell 9 covers the opening, the pressure relief mechanism 10 is arranged on the cover 92, a first insulation 11 is connected to a surface of the cover 92 facing the electrode assembly 8, a surface of the first insulation 11 facing the cover 92 is provided with a groove 112, the filter 12 is located in the groove 112 and is clamped on a connecting structure 113 arranged on a bottom surface of the groove 112, and a first lead-out channel 111 in the first insulation 11 is in communication with the bottom surface of the groove 112 to communicate the cavity 90 with the pressure relief mechanism 10.

[0141] In the above structure, since the cover 92 is provided with the filter 12 on the side facing the electrode assembly 8, and the filter 12 is connected to the first insulation 11 and covers the opening of the first lead-out channel 111, when the battery cell 7 has thermal runaway and high-temperature venting substances are discharged outward, the solid particles in the high-temperature venting substances are filtered by the filter 12 and are not easily discharged outward, so that the high-temperature solid particles are not easy to ignite the flammable gas in the high-temperature venting substances outside the battery cell 7, and the reliability of the battery cell 7 is improved.

[0142] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present 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 cell, characterized in that: include: electrode assembly; The housing comprises a shell and a cover, wherein the shell forms a cavity with an opening, the electrode assembly is located in the cavity, and the cover covers the opening; a pressure relief mechanism, disposed on the cover; a first insulating member connected to a surface of the cover body facing the electrode assembly, the first insulating member being provided with a first lead-out channel, the first lead-out channel connecting the cavity with the pressure relief mechanism; A filter element is located on a side of the cover body facing the electrode assembly, the filter element is connected to the first insulating element and covers the opening of the first outlet channel; the filter element includes a filter screen, and the filter screen is provided with a high-temperature resistant coating.

2. The battery cell according to claim 1, wherein: The filter element has a filter channel, and the equivalent diameter of the filter channel is set to D, 20 μm≤D≤1000 μm.

3. The battery cell according to claim 1, wherein: Along the thickness direction of the cover body, the orthographic projection of the pressure relief mechanism is located within the range of the orthographic projection of the filter element.

4. The battery cell according to claim 1, wherein: A groove is provided on the surface of the first insulating member facing the cover body, at least a portion of the filter member is provided in the groove, and the first outlet channel is connected to the bottom surface of the groove.

5. The battery cell according to claim 4, characterized in that The filter element is provided with a connecting hole, and the connecting hole passes through the filter element along the thickness direction of the cover body. The bottom surface of the groove is provided with a connecting structure, and the connecting structure is clamped in the connecting hole.

6. The battery cell according to claim 5, characterized in that The connecting structure includes a protrusion and a limiting portion that are connected to each other, the protrusion is connected to the bottom surface of the groove, the protrusion extends from the connecting hole, the limiting portion is protruded from the outer peripheral surface of the protrusion extending from the connecting hole, and the limiting portion is blocked outside the surface of the filter element away from the bottom surface of the groove.

7. The battery cell according to claim 6, characterized in that The protrusion and the cover are arranged opposite to each other and spaced apart along the thickness direction of the cover.

8. The battery cell according to claim 1, wherein: The filter element further includes at least one of a porous solid media structure and a loosely packed media structure.

9. The battery cell according to claim 1, characterized in that The heat-resistant temperature of the high-temperature resistant coating is E, 1000°C≤E≤1500°C.

10. The battery cell according to claim 1, characterized in that The first insulating member includes a main body and a first protrusion protruding from the main body toward the electrode assembly, the main body is connected to the surface of the cover body facing the electrode assembly, the first protrusion is pressed against the electrode assembly to form a gap between the main body and the electrode assembly, and the first lead-out channel connects the gap with the pressure relief mechanism.

11. The battery cell according to claim 10, characterized in that Along the length direction of the cover body, the first outlet channel passes through the first protrusion.

12. The battery cell according to claim 10, characterized in that The first insulating member also includes at least two second protrusions protruding from the main body toward the electrode assembly, the second protrusions abutting against the electrode assembly, at least two second protrusions are arranged on both sides of the first protrusion in the length direction of the cover body, and the second protrusion is provided with a second lead-out channel, and the second lead-out channel passes through the second protrusion along the length direction of the cover body.

13. The battery cell according to claim 1, characterized in that The filter element has a filter channel, and the cross-section of the filter channel is configured to be polygonal, circular or elliptical.

14. A battery device, characterized in that: A battery cell according to any one of claims 1 to 13.

15. An electrical device, characterized in that: The battery device according to claim 14 is included, and is used to provide electrical energy.

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