Battery cell, battery device, and electric device

Abstract

The application provides a battery monomer, a battery device and a power utilization device. A pressure relief mechanism of the battery monomer is arranged on a cover body. An insulating piece includes a main body structure and a first supporting structure connected to each other. The main body structure is connected to a surface of the cover body facing a cavity. The main body structure is provided with an exhaust passage for connecting the cavity and the pressure relief mechanism. The first supporting structure protrudes from the surface of the main body structure facing the cavity and abuts against an electrode assembly to form a gap. A heat-resistant temperature of the first supporting structure is set as D, and D is greater than or equal to 500 DEG C. When the battery monomer has a temperature rise of thermal runaway, the first supporting structure can still maintain the original appearance and abut against the electrode assembly, so that a gap is kept between the main body structure and the electrode assembly. The discharge material generated in the battery monomer can be smoothly discharged through the gap, the exhaust passage and the pressure relief mechanism, the possibility of explosion of the battery monomer is reduced, and the reliability of the battery monomer is improved.

Description

Technical Field

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

[0002] Battery devices have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships and power tools.

[0003] As the application scope of battery devices continues to expand, the requirements for these devices are also increasing. Improving the reliability of battery devices is receiving increasing attention from those skilled in the art. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, wherein the battery cell has high reliability.

[0005] In a first aspect, this application provides a battery cell comprising an electrode assembly, a housing, a pressure relief mechanism, and an insulating member. The housing includes a shell and a cover, the shell forming a cavity with an opening. The electrode assembly is located in the cavity, the cover closes to the opening, the pressure relief mechanism is disposed on the cover, and the insulating member is located between the cover and at least a portion of the electrode assembly. The insulating member includes a main body structure and a first support structure interconnected. The main body structure is connected to the surface of the cover facing the cavity and has an exhaust channel that connects the cavity to the pressure relief mechanism. Along the thickness direction of the cover, the first support structure protrudes from the surface of the main body structure facing the cavity and abuts against the electrode assembly to form a gap between the main body structure and the electrode assembly. The heat resistance temperature of the first support structure is set to D, where D ≥ 500°C. In the above structure, since the first support structure protrudes from the surface of the main structure toward the cavity and abuts against the electrode assembly, a gap can be formed between the main structure and the electrode assembly. In addition, the heat resistance temperature D of the first support structure is in the range of D≥500℃. When the battery cell experiences thermal runaway and temperature rise, the first support structure can still maintain its original shape and abut against the electrode assembly, so that a gap is maintained between the main structure and the electrode assembly. The released substances generated inside the battery cell can be smoothly discharged through the gap, the exhaust channel and the pressure relief mechanism, reducing the possibility of the battery cell exploding and other dangers, and helping to improve the reliability of the battery cell.

[0006] According to some embodiments of this application, the battery cell has a stepped hole in its main body structure. A first support structure includes a supporting portion and a connecting portion connected to each other. The connecting portion protrudes from the outer peripheral surface of the supporting portion. The connecting portion engages with the large-diameter section of the stepped hole, and the supporting portion engages with the small-diameter section of the stepped hole. The supporting portion extends from the small-diameter section of the stepped hole and abuts against the electrode assembly. By engaging the connecting portion with the large-diameter section of the stepped hole and the supporting portion with the small-diameter section of the stepped hole, the connection strength between the first support structure and the main body structure is improved, making the first support structure less prone to detachment from the main body structure.

[0007] According to some embodiments of the present application, the battery cell includes an insulating member that is connected to the main body structure. Along the thickness direction of the cover, the connecting structure protrudes from the surface of the main body structure facing the cover and is connected to the cover, so that the insulating member is connected to the cover.

[0008] According to some embodiments of this application, a gap is formed between the main body structure and the cover of the battery cell. The gap is connected to the pressure relief mechanism, so that the venting material on the outside of the electrode assembly can flow through the gap to the pressure relief mechanism, which facilitates the discharge of the venting material on the outside of the electrode assembly.

[0009] According to some embodiments of the present application, the surface of the first support structure facing the cover is flush with the surface of the main structure facing the cover. The first support structure is provided with a first through hole. The first through hole penetrates the first support structure along the thickness direction of the cover and communicates with the gap. By having the first through hole penetrate the first support structure along the thickness direction of the cover, the first through hole can connect the gap between the main structure and the cover. This allows the venting material entering the first through hole from the port near the electrode assembly to enter the gap from the port near the cover, facilitating its flow to the pressure relief mechanism through the gap. This also helps to ensure that the venting material released from the portion of the electrode assembly that abuts against the first support structure can be smoothly discharged through the first through hole.

[0010] According to some embodiments of this application, the battery cell, the connection structure and the main body structure are integrally formed.

[0011] According to some embodiments of the present application, the battery cell is provided with a first support structure having a second through hole. The second through hole penetrates the first support structure along the length of the cover and communicates with the gap, so that the vented substances on both sides of the cover in the length direction can smoothly enter the gap through the second through hole, so as to enter the exhaust channel and then be discharged through the pressure relief mechanism.

[0012] According to some embodiments of this application, the battery cell includes at least two first support structures. Along the length of the cover, the at least two first support structures are respectively disposed on both sides of the exhaust channel, so that the at least two first support structures can abut against the electrode assembly on both sides of the exhaust channel, thereby stabilizing the gap between the main structure and the electrode assembly, which is beneficial for the discharged substances to smoothly enter the exhaust channel through the gap.

[0013] According to some embodiments of the present application, the battery cell includes an insulating member that is connected to the main body structure. Along the thickness direction of the cover, the second support structure protrudes from the surface of the main body structure facing the cavity and abuts against the electrode assembly. Along the thickness direction of the cover, at least a portion of the orthographic projection of the second support structure is located within the orthographic projection range of the exhaust channel. The second support structure is provided with a third through hole. The third through hole penetrates the second support structure along the length direction of the cover and connects the exhaust channel with the gap, so that the venting material entering the gap can enter the exhaust channel through the third through hole.

[0014] According to some embodiments of the present application, the battery cell has a first support structure extending along the width direction of the cover and a second support structure extending along the width direction of the cover, so that the first support structure and the second support structure have a larger contact area with the electrode assembly, which is beneficial to improving the stability of the first support structure and the second support structure in contacting the electrode assembly.

[0015] According to some embodiments of the battery cell provided in this application, along the thickness direction of the cover, the dimension of the first support structure is set to E, 4mm≤E≤6mm, and the dimension of the main body structure is set to F, 1.5mm≤F≤3mm. When the main body structure is heated and melted, the first support structure can still support a space in the thickness direction of the cover that is greater than the thickness of the main body structure, so that a gap is formed between the main body structure and the electrode body for guiding the released substances to the exhaust channel.

[0016] According to some embodiments of this application, the battery cell has a first support structure configured as a ceramic structure, which enables the first support structure to have both high heat resistance temperature and high structural strength, thus meeting the heat resistance requirements and the support requirements for the electrode assembly.

[0017] Secondly, this application provides a battery device that includes the battery cell provided by any of the above-described technical solutions. Because the battery device includes the battery cell provided by the above-described technical solutions, the battery device has high reliability.

[0018] Thirdly, this application provides an electrical device that includes a battery device provided by any of the above-described technical solutions, the battery device being used to provide electrical energy.

[0019] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0020] This application provides a battery cell including an electrode assembly, a housing, a pressure relief mechanism, and an insulating component. The housing includes a shell and a cover, the shell forming a cavity with an opening. The electrode assembly is located in the cavity, the cover closes to the opening, the pressure relief mechanism is disposed on the cover, and the insulating component is located between the cover and at least a portion of the electrode assembly. The insulating component includes a main body structure and a first support structure interconnected. The main body structure is connected to the surface of the cover facing the cavity and has an exhaust channel that connects the cavity to the pressure relief mechanism. Along the thickness direction of the cover, the first support structure protrudes from the surface of the main body structure facing the cavity and abuts against the electrode assembly to form a gap between the main body structure and the electrode assembly. The heat resistance temperature of the first support structure is set to D, where D ≥ 500℃.

[0021] In the above structure, since the first support structure protrudes from the surface of the main structure toward the cavity and abuts against the electrode assembly, a gap can be formed between the main structure and the electrode assembly. In addition, the heat resistance temperature D of the first support structure is in the range of D≥500℃. When the battery cell experiences thermal runaway and temperature rise, the first support structure can still maintain its original shape and abut against the electrode assembly, so that a gap is maintained between the main structure and the electrode assembly. The released substances generated inside the battery cell can be smoothly discharged through the gap, the exhaust channel and the pressure relief mechanism, reducing the possibility of the battery cell exploding and other dangers, and helping to improve the reliability of the battery cell.

[0022] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. 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.

[0024] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0025] Figure 2 This is a exploded view of a battery device provided in some embodiments of this application;

[0026] Figure 3 This is a split view of a battery cell provided in some embodiments of this application;

[0027] Figure 4 This is a cross-sectional view of the first support structure of a battery cell provided in some embodiments of this application;

[0028] Figure 5 This is a top view of the insulating component of a battery cell provided in some embodiments of this application;

[0029] Figure 6 For some embodiments in this application Figure 5 Sectional view at point GG;

[0030] Figure 7 For other embodiments in this application Figure 5 Sectional view at point GG;

[0031] Figure 8 For some embodiments in this application Figure 5 Sectional view at HH;

[0032] Figure 9 For some embodiments in this application Figure 5 Sectional view at point II.

[0033] In the attached diagram:

[0034] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Accommodation space; 7. Battery cell; 8. Electrode assembly; 9. Outer shell; 91. Housing; 92. Cover; 921. Electrode terminal; 10. Pressure relief mechanism; 11. Insulating component; 111. Main structure; 1111. Exhaust channel; 1112. Stepped hole; 112. First support structure; 1121. Supporting part; 1122. Connecting part; 113. Connecting structure; 1123. First through hole; 1124. Second through hole; 114. Second support structure; 1141. Third through hole; 12. Gap; 13. Slit; X. Length direction of the cover; Y. Width direction of the cover; Z. Thickness direction of the cover. Detailed Implementation

[0035] 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.

[0036] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0037] 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", "circumferential", etc., 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 do not 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.

[0038] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more (including two), unless otherwise explicitly specified.

[0039] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the 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.

[0040] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields.

[0042] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cell assemblies to provide higher voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0043] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0044] A battery cell can be a rechargeable battery cell, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0045] Battery cells can be lithium-ion cells, sodium-ion cells, sodium-lithium-ion cells, lithium metal cells, sodium metal cells, lithium-sulfur cells, magnesium-ion cells, nickel-metal hydride cells, nickel-cadmium cells, lead-acid cells, etc.

[0046] 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.

[0047] In some embodiments, the battery cell further 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.

[0048] In some embodiments, the electrolyte includes an electrolyte salt and a solvent.

[0049] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0050] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0051] In some embodiments, the electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0052] In some embodiments, a single 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.

[0053] As an example, the battery cell can be a prismatic battery cell, including a prismatic battery cell, a blade-shaped battery cell, or a multi-prism battery, such as a hexagonal prism battery. In the embodiments of this application, the battery cell is a blade-shaped battery cell.

[0054] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0055] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0056] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0057] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0058] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0059] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0060] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0061] As an example, the enclosure may include a first enclosure section and a second enclosure section. The first enclosure section and the second enclosure section are fastened together to form a closed space inside the enclosure for housing the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure section may be a top cover or a bottom plate.

[0062] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0063] 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.

[0064] In some embodiments, the battery device can be used in an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0065] Typically, battery cells are equipped with a pressure relief mechanism on their casing. When the internal pressure of the battery cell exceeds a preset temperature, the pressure relief mechanism is activated to release the internal pressure and temperature. For example, if a battery cell experiences thermal abuse or mechanical misuse during use, it is prone to thermal runaway. During thermal runaway, hydrogen, carbon monoxide, and alkane gases are generated inside the battery cell. These gases, mixed with particulate matter inside the battery cell, are released through the pressure relief mechanism. Because the internal temperature of the battery cell is very high during thermal runaway (up to 300°C), the insulating parts (usually plastic) on the casing used to support and position the electrode assembly can deform or even melt due to heat. They may lose their original shape and fail to maintain the original support and positioning of the electrode assembly. The electrode assembly can then be pushed towards the pressure relief mechanism by the impact of the released material, potentially causing blockage of the mechanism. This can easily lead to the separation of the battery cell's top cover or even an explosion, which is detrimental to the reliability of the battery cell.

[0066] To improve the reliability of the battery cell, the battery cell includes an electrode assembly, a housing, a pressure relief mechanism, and an insulating component. The housing includes a shell and a cover, the shell forming a cavity with an opening. The electrode assembly is located in the cavity, the cover closes to the opening, the pressure relief mechanism is disposed on the cover, and the insulating component is located between the cover and at least part of the electrode assembly. The insulating component includes a main body structure and a first support structure interconnected. The main body structure is connected to the surface of the cover facing the cavity and has an exhaust channel that connects the cavity to the pressure relief mechanism. Along the thickness direction of the cover, the first support structure protrudes from the surface of the main body structure facing the cavity and abuts against the electrode assembly to form a gap between the main body structure and the electrode assembly. The heat resistance temperature of the first support structure is set to D, where D ≥ 400℃.

[0067] In the above structure, since the first support structure protrudes from the surface of the main structure toward the cavity and abuts against the electrode assembly, a gap can be formed between the main structure and the electrode assembly. In addition, the heat resistance temperature D of the first support structure is in the range of D≥400℃. When the battery cell experiences thermal runaway and temperature rise, the first support structure can still maintain its original shape and abut against the electrode assembly, so that a gap is maintained between the main structure and the electrode assembly. The released substances generated inside the battery cell can be smoothly discharged through the gap, the exhaust channel and the pressure relief mechanism, reducing the possibility of the battery cell exploding and other dangers, and helping to improve the reliability of the battery cell.

[0068] The battery cells described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0069] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, among others. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0070] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0071] Figure 1 The diagram shows the structure of a vehicle provided in some embodiments of this application.

[0072] like Figure 1As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0073] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0074] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0075] Figure 2 This is a exploded view of a battery device provided in some embodiments of this application. For example... Figure 2 As shown, the battery device 2 includes a housing 5 and battery cells 7, with the battery cells 7 housed within the housing 5. The battery cell 7 can be the smallest unit that makes up a battery.

[0076] The housing 5 is used to house the battery cell 7, and the housing 5 can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, and together define a housing space 5c for housing the battery cell 7. The second housing portion 5b may be a hollow structure with one end open, and the first housing portion 5a may be a plate-like structure, with the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c; alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one side open, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c. Of course, the first housing portion 5a and the second housing portion 5b can be various shapes, such as cylinders, cuboids, etc.

[0077] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0078] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.

[0079] In the battery device 2, there can be one or more battery cells 7. If there are multiple battery cells 7, they can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery cells 7 are connected in both series and parallel. Multiple battery cells 7 can be directly connected in series, in parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 7 is housed in the housing 5. Alternatively, multiple battery cells 7 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 5.

[0080] Some embodiments of this application provide a single battery cell, see reference. Figure 3 The battery cell 7 includes an electrode assembly 8, a housing 9, a pressure relief mechanism 10, and an insulating member 11. The housing 9 includes a shell 91 and a cover 92. The shell 91 forms a cavity with an opening. The electrode assembly 8 is located in the cavity. The cover 92 closes to the opening. The pressure relief mechanism 10 is disposed on the cover 92. The insulating member 11 is located between the cover 92 and at least a portion of the electrode assembly 8. The insulating member 11 includes a main body structure 111 and a first support structure 112 that are interconnected. The main body structure 111 is connected to the surface of the cover 92 facing the cavity. The main body structure 111 is provided with an exhaust channel 1111, which connects the cavity to the pressure relief mechanism 10. Figure 4 Along the thickness direction Z of the cover, the first support structure 112 protrudes from the main structure 111 toward the surface of the cavity. The first support structure 112 abuts against the electrode assembly 8 to form a gap 12 between the main structure 111 and the electrode assembly 8. The heat resistance temperature of the first support structure 112 is set to D, where D≥400℃.

[0081] Electrode assembly 8 is a component in the battery cell 7 where an electrochemical reaction occurs. The housing 9 may contain one or more electrode assemblies 8. Electrode assembly 8 may include an electrode body and tabs. The tabs extend from the side of the electrode body facing the cover 92 and are used to connect to electrode terminals 921 on the cover 92, enabling the electrode assembly 8 to be electrically connected to an external electrical device or charging device via the electrode terminals 921.

[0082] The electrode assembly 8 may include a positive electrode, a negative electrode, and a separator. The positive and negative electrodes can serve as the positive and negative electrodes, respectively. During the charging and discharging process of the battery cell 7, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is stacked between the positive and negative electrodes to isolate them, preventing short circuits while allowing active ions to pass through.

[0083] The outer casing 9 may be a component in the battery cell 7 used to form a sealed space, which is used to house other components such as the electrode assembly 8 in the battery cell 7.

[0084] The housing 91 and the cover 92 are two interconnected parts of the outer shell 9. The housing 91 forms a cavity with one open end, which not only allows components such as the electrode assembly 8 and the insulating component 11 to be placed in the cavity, but also allows the electrode assembly 8 and other components to be easily inserted into the cavity through the opening. The cover 92 can be a part used to seal the opening, and it seals the housing 91 to form a sealed space in the cavity. The cover 92 can be welded to the housing 91 to seal the opening.

[0085] The pressure relief mechanism 10 can be a mechanism for releasing the pressure or temperature inside the battery cell 7. By providing the pressure relief mechanism 10 on the cover 92, the battery cell 7 can release substances to the outside through the pressure relief mechanism 10 on the cover 92.

[0086] As an example, when the internal pressure or temperature of the battery cell 7 reaches a predetermined threshold, 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 the predetermined threshold, the pressure relief mechanism 10 performs an action or a weak structure provided in the pressure relief mechanism 10 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. This threshold design varies depending on design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 7.

[0087] As an example, the pressure relief mechanism 10 can be integrally formed with the cover 92.

[0088] As an example, the pressure relief mechanism 10 can also be separately configured and connected to the cover 92.

[0089] The term "actuation" as used in this application refers to the pressure relief mechanism 10 being activated or undergoing a certain state, thereby releasing the material inside the battery cell 7 and relieving internal pressure and temperature. The actions of the pressure relief mechanism 10 may include, but are not limited to: movement of components within the pressure relief mechanism 10 to form an exhaust channel 1111, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 10, etc. When the pressure relief mechanism 10 is actuated, the high-temperature, high-pressure material inside the battery cell 7 is discharged outwards from the actuated portion as a release substance. This method enables pressure and temperature relief in the battery cell 7 under controllable pressure or temperature, thereby reducing the potential for more serious accidents.

[0090] In some embodiments, when the housing 9 is a non-sealed structure, the pressure relief mechanism 10 can be configured as a through hole for discharging gas inside the battery cell 7.

[0091] The substances released from the battery cell 7 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode particles or fragments, separator particles or fragments, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0092] The insulating member 11 may be an insulating member disposed on the side of the cover 92 facing the cavity, which is used to insulate the cover 92 from devices such as the electrode assembly 8 in the cavity. The insulating member 11 is located between the cover 92 and at least part of the electrode assembly 8. Alternatively, the entire electrode assembly 8 may be located on the side of the insulating member 11 away from the cover 92, with the insulating member 11 located between the electrode assembly 8 and the cover 92; or, a portion of the electrode assembly 8 (e.g., a tab) may pass through the insulating member 11 and be connected to the electrode terminal 921 of the cover 92, in which case the insulating member 11 is located between the cover 92 and part of the electrode assembly 8.

[0093] The main structure 111 and the first support structure 112 are two interconnected parts of the insulating component 11. Both are made of insulating material, which gives the insulating component 11 insulating properties.

[0094] The main structure 111 is the main part of the insulating component 11. It is connected to the surface of the cover 92 facing the cavity and can cover most of the surface of the cover 92 facing the cavity to insulate the cover 92 from the electrode assembly 8. Exemplarily, the main structure 111 can be connected to the surface of the cover 92 facing the cavity by a hot-melt process, or by snap-fit, adhesive or other methods.

[0095] The exhaust passage 1111 can be a channel provided in the main structure 111 for the passage of discharged substances. By connecting the cavity to the pressure relief mechanism 10, the exhaust passage 1111 allows the discharged substances in the cavity to flow through the exhaust passage 1111 to the pressure relief mechanism 10, so as to be discharged to the outside of the battery cell 7.

[0096] For example, the exhaust channel 1111 extends through the main structure 111 along the thickness direction Z of the cover, making the path of the exhaust channel 1111 shorter, which is conducive to the rapid discharge of the released substances.

[0097] The first support structure 112 may be a structural part of the insulating member 11 used to support the electrode assembly 8.

[0098] The first support structure 112 protrudes from the main structure 111 toward the surface of the cavity along the thickness direction Z of the cover, so that the first support structure 112 can protrude directly toward the electrode assembly 8 in order to support the electrode assembly 8 and make the electrode assembly 8 positioned in the cavity and not easily moved.

[0099] The first support structure 112 abuts against the electrode assembly 8 to form a gap 12 between the main structure 111 and the electrode assembly 8. This means that the first support structure 112, which protrudes from the surface of the main structure 111 toward the cavity, abuts against the electrode assembly 8, so that a gap 12 can be formed between the main structure 111 and the electrode assembly 8, making it less likely for the exhaust passage 1111 to be blocked by the electrode assembly 8. The venting material inside the battery cell 7 can enter the exhaust passage 1111 through the gap 12 and then flow to the pressure relief mechanism 10.

[0100] The heat resistance temperature of the first support structure 112 can refer to the highest temperature at which the first support structure 112 can safely and reliably withstand without failure, permanent deformation, significant performance degradation, or safety risks. By setting the range of the heat resistance temperature D of the first support structure 112 to D≥400℃, the first support structure 112 is less likely to deform due to high temperature when the battery cell 7 experiences thermal runaway. The first support structure 112 can maintain its original shape to support the electrode assembly 8, thereby maintaining the gap 12 between the main structure 111 and the electrode assembly 8.

[0101] The heat resistance temperature D of the first support structure 112 can be set to a range of D≥700℃. For example, the heat resistance temperature D of the first support structure 112 can be set to 700℃, 800℃, 900℃ or 1000℃. When the battery cell 7 experiences thermal runaway, the first support structure 112 is not easily deformed due to high temperature, and the gap 12 between the main structure 111 and the electrode assembly 8 can be maintained.

[0102] For example, the heat resistance temperature of the first support structure 112 can be determined according to the national standard GB / T 3298-2022. The specific determination method can be referred to the national standard GB / T 3298-2022, and will not be repeated here.

[0103] In the above structure, since the first support structure 112 protrudes from the surface of the main structure 111 toward the cavity and abuts against the electrode assembly 8, a gap 12 can be formed between the main structure 111 and the electrode assembly 8. In addition, the heat resistance temperature D of the first support structure 112 is in the range of D≥400℃. When the battery cell 7 experiences thermal runaway and temperature rise, the first support structure 112 can still maintain its original shape and abut against the electrode assembly 8, so that a gap 12 is maintained between the main structure 111 and the electrode assembly 8. The released substances generated inside the battery cell 7 can be smoothly discharged through the gap 12, the exhaust channel 1111 and the pressure relief mechanism 10, reducing the possibility of the battery cell 7 exploding or other dangers, and improving the reliability of the battery cell 7.

[0104] In some embodiments, reference Figure 5 , Figure 6and Figure 7 The main structure 111 is provided with a stepped hole 1112. The first support structure 112 includes a supporting part 1121 and a connecting part 1122 that are connected to each other. The connecting part 1122 protrudes from the outer peripheral surface of the supporting part 1121. The connecting part 1122 is fitted to the large diameter section of the stepped hole 1112. The supporting part 1121 is fitted to the small diameter section of the stepped hole 1112. The supporting part 1121 extends from the small diameter section of the stepped hole 1112 and abuts against the electrode assembly 8.

[0105] The stepped hole 1112 can be a hole-like structure opened on the main structure 111, which includes two interconnected parts: a large-diameter section and a small-diameter section. Along the central axis of the stepped hole 1112, the orthographic projection of the small-diameter section is located within the orthographic projection range of the large-diameter section. The central axis of the stepped hole 1112 extends along the thickness direction Z of the cover body.

[0106] The supporting part 1121 and the connecting part 1122 are two interconnected parts of the first support structure 112. The connecting part 1122 is used to connect with the main structure 111, and the supporting part 1121 is used to abut against the electrode assembly 8.

[0107] The connecting portion 1122 protrudes from the outer peripheral surface of the supporting portion 1121. This can be such that the orthographic projection of the supporting portion 1121 lies within the orthographic projection range of the connecting portion 1122 along the central axis of the stepped hole 1112. By fitting the connecting portion 1122 into the large-diameter section of the stepped hole 1112 and fitting the supporting portion 1121 into the small-diameter section of the stepped hole 1112, the supporting portion 1121 can improve the connection strength between the first support structure 112 and the main structure 111 through its engagement with the large-diameter section of the stepped hole 1112, making it less likely for the first support structure 112 to detach from the main structure 111.

[0108] By setting the abutment portion 1121 to extend from the small diameter section of the stepped hole 1112, the extended abutment portion 1121 is able to abut the electrode assembly 8.

[0109] In some embodiments, continue to refer to Figure 5 The insulating component 11 also includes a connecting structure 113 connected to the main structure 111. Along the thickness direction Z of the cover, the connecting structure 113 protrudes from the surface of the main structure 111 facing the cover 92. The connecting structure 113 is connected to the cover 92 to form a gap 13 between the main structure 111 and the cover 92. The gap 13 is connected to the pressure relief mechanism 10.

[0110] The connecting structure 113 can be a structure in the insulating member 11 for connecting with the cover 92. The connecting structure 113 protrudes from the surface of the main structure 111 toward the cover 92 along the thickness direction Z of the cover, so that the connecting structure 113 can connect to the surface of the cover 92 toward the cavity, thereby realizing the connection between the insulating member 11 and the cover 92.

[0111] For example, the connecting structure 113 is connected to the surface of the cover 92 facing the cavity by an ultrasonic heat-melting process. In some embodiments, the surface of the cover 92 facing the main structure 111 is recessed inward to form a recess, and part of the connecting structure 113 extends into the recess and is connected to the inner wall surface of the recess by an ultrasonic heat-melting process.

[0112] In some embodiments, a gap 13 is formed between the main structure 111 and the cover 92, and the gap 13 is connected to the pressure relief mechanism 10.

[0113] By forming a gap 13 between the main structure 111 and the cover 92, and making the gap 13 able to communicate with the pressure relief mechanism 10 provided on the cover 92, the venting material outside the electrode assembly 8 can flow through the gap 13 to the pressure relief mechanism 10, which facilitates the discharge of the venting material outside the electrode assembly 8.

[0114] In some embodiments, the connecting structure 113 may be configured as a columnar structure that protrudes from the surface of the main structure 111 toward the cover 92 along the thickness direction Z of the cover, so that the connecting structure 113 can be conveniently connected to the surface of the cover 92 toward the cavity by a hot-melt process.

[0115] In some embodiments, continue to refer to Figure 6 and Figure 7 The surface of the first support structure 112 facing the cover 92 is flush with the surface of the main structure 111 facing the cover 92. The first support structure 112 is provided with a first through hole 1123. The first through hole 1123 penetrates the first support structure 112 along the thickness direction Z of the cover and communicates with the gap 13.

[0116] The surface of the first support structure 112 facing the cover 92 is flush with the surface of the main structure 111 facing the cover 92. This means that the surface of the first support structure 112 facing the cover 92 and the surface of the main structure 111 facing the cover 92 are on the same plane, so that there is no main structure 111 between the first support structure 112 and the cover 92. Since the main structure 111 may not maintain its original shape or may even melt during thermal runaway of the battery cell 7, by eliminating the main structure 111 between the first support structure 112 and the cover 92, the two ends of the first support structure 112 in the thickness direction of the cover 92 can directly abut against the cover 92 and the electrode assembly 8, allowing the gap 12 between the main structure 111 and the electrode assembly 8 to be better maintained by the first support structure 112.

[0117] The first through hole 1123 can be a hole-like structure provided on the first support structure 112. By passing the first through hole 1123 through the first support structure 112 along the thickness direction Z of the cover, the first through hole 1123 can connect the gap 13 between the main structure 111 and the cover 92, so that the venting material entering the first through hole 1123 from the port near the electrode assembly 8 can enter the gap 13 from the port near the cover 92, and flow to the pressure relief mechanism 10 through the gap 13. This facilitates the smooth discharge of the venting material released from the part of the electrode assembly 8 that abuts against the first support structure 112 through the first through hole 1123.

[0118] In some embodiments, the connecting structure 113 and the main structure 111 are integrally formed.

[0119] The connecting structure 113 and the main structure 111 are integrally molded structures, which means that the connecting structure 113 and the main structure 111 are simultaneously injection molded using injection molding technology. This not only makes the processing and manufacturing of the insulating part 11 convenient, but also helps to improve the overall strength of the insulating part 11. The connecting structure 113 and the main structure 111 can also be manufactured by machining methods such as milling, by processing a whole blank.

[0120] For example, the first support structure 112 can be placed as an insert in the mold cavity during the injection molding of the connecting structure 113 and the main structure 111, so that the injection material directly covers part of the first support structure 112 in the mold cavity, so that the main structure 111 is formed on the first support structure 112, and so that the first support structure 112 is firmly connected to the main structure 111, thereby improving the overall structural strength and production convenience of the insulating component 11.

[0121] In some embodiments, the first support structure 112 is provided with a second through hole 1124, which penetrates the first support structure 112 along the length direction X of the cover and communicates with the gap 12.

[0122] The second through hole 1124 can be a hole-like structure provided on the first support structure 112. By passing the second through hole 1124 through the first support structure 112 along the length direction X of the cover, the second through hole 1124 can be connected to the gap 12, so that the vented material of the battery cell 7 on both sides of the length direction X of the cover can smoothly enter the gap 12 through the second through hole 1124, so as to enter the exhaust channel 1111, and then be discharged through the pressure relief mechanism 10.

[0123] For example, the second through hole 1124 is connected to the first through hole 1123.

[0124] In some embodiments, continue to refer to Figure 7 The second through hole 1124 is connected to the surface of the first support structure 112 facing the electrode assembly 8.

[0125] In some embodiments, the insulating member 11 includes at least two first support structures 112, which are respectively disposed on both sides of the exhaust channel 1111 along the length direction X of the cover.

[0126] By including at least two first support structures 112 in the insulating member 11, and by distributing the at least two first support structures 112 along the length direction X of the cover on both sides of the exhaust channel 1111, the at least two first support structures 112 can support the electrode assembly 8 on both sides of the exhaust channel 1111, thereby stabilizing the shape of the gap 12 formed between the main structure 111 and the electrode assembly 8, which is beneficial for the discharged substance to smoothly enter the exhaust channel 1111 through the gap 12.

[0127] In some embodiments, reference Figure 5 , Figure 8 and Figure 9 The insulating component 11 also includes a second support structure 114 connected to the main structure 111. Along the thickness direction Z of the cover, the second support structure 114 protrudes from the surface of the main structure 111 facing the cavity and abuts against the electrode assembly 8. Along the thickness direction Z of the cover, at least a portion of the orthographic projection of the second support structure 114 is located within the orthographic projection range of the exhaust channel 1111. The second support structure 114 is provided with a third through hole 1141. The third through hole 1141 penetrates the second support structure 114 along the length direction X of the cover and communicates with the gap 12.

[0128] The second support structure 114 may be a structural part of the insulating member 11 used to support the abutment electrode assembly 8.

[0129] The second support structure 114 protrudes from the main structure 111 toward the surface of the cavity along the thickness direction Z of the cover, so that the second support structure 114 can protrude directly toward the electrode assembly 8 in order to support the electrode assembly 8 and make the electrode assembly 8 positioned in the cavity and not easily moved.

[0130] At least a portion of the second support structure 114 is projected along the thickness direction Z of the cover into the range of the projection of the exhaust channel 1111 along the thickness direction Z of the cover, such that the second support structure 114 and the exhaust channel 1111 are positioned opposite each other along the thickness direction Z of the cover, so that the second support structure 114 can support the gap 12 at the exhaust channel 1111, making the shape of the gap 12 at the exhaust channel 1111 stable, which is beneficial to improving the smoothness of the released material from the gap 12 to the exhaust channel 1111.

[0131] The third through hole 1141 can be a hole-like structure provided in the second support structure 114, which can connect the exhaust channel 1111 with the gap 12, and the released material entering the gap 12 can enter the exhaust channel 1111 through the third through hole 1141.

[0132] The third through hole 1141 extends through the second support structure 114 along the length direction X of the cover. This means that the third through hole 1141 extends along the length direction X of the cover and penetrates the second support structure 114, so that the gaps 12 on both sides of the second support structure 114 in the length direction X of the cover can be connected to the exhaust channel 1111 through the third through hole 1141.

[0133] For example, the third through hole 1141 may be connected to the surface of the second support structure 114 facing the electrode assembly 8, so that the pressure relief material released from the portion of the electrode assembly 8 that abuts against the second support structure 114 can pass through the third through hole 1141 to the exhaust passage 1111.

[0134] In some embodiments, the first support structure 112 extends along the width direction Y of the cover, and the second support structure 114 extends along the width direction Y of the cover.

[0135] By setting the first support structure 112 to extend along the width direction Y of the cover, the first support structure 112 has a larger contact area with the electrode assembly 8, which is beneficial to improving the stability of the first support structure 112 in contacting the electrode assembly 8.

[0136] By setting the second support structure 114 to extend along the width direction Y of the cover, the second support structure 114 has a larger contact area with the electrode assembly 8, which is beneficial to improving the stability of the second support structure 114 in contacting the electrode assembly 8.

[0137] In some embodiments, along the thickness direction Z of the cover, the size of the first support structure 112 is set to E, 4mm≤E≤6mm, and the size of the main structure 111 is set to F, 1.5mm≤F≤3.5mm.

[0138] By setting the dimension F of the main structure 111 along the thickness direction Z of the cover to a range of 1.5mm≤F≤3.5mm, not only can the thickness of the main structure 111 be sufficient to give it sufficient structural strength and insulation capacity, but the thickness of the main structure 111 is also not too large, thus reducing the space occupied by the main structure 111.

[0139] The dimension F of the main structure 111 along the thickness direction Z of the cover can be set to a range of 2mm ≤ F ≤ 3mm. For example, the dimension F of the main structure 111 along the thickness direction Z of the cover can be set to 2mm, 2.5mm or 3mm, so that the thickness of the main structure 111 can give the main structure 111 sufficient structural strength and insulation capability without occupying too much space, which is beneficial to improving the energy density of the battery cell 7.

[0140] By setting the size E of the first support structure 112 along the thickness direction Z of the cover to a range of 4mm≤E≤6mm, not only does the first support structure 112 have sufficient size in the thickness direction Z of the cover to form a gap 12 that allows the discharged material to flow smoothly to the exhaust channel 1111, thus giving the gap 12 sufficient exhaust capacity, but it also ensures that the size of the gap 12 in the thickness direction Z of the cover is not too large and thus reduces the energy density of the battery cell 7.

[0141] The dimension E of the first support structure 112 along the thickness direction Z of the cover can be set to be 4.5mm≤E≤5.5mm, so that the gap 12 formed by the first support structure 112 and the electrode assembly 8 can smoothly discharge the released substances, while not being too large and reducing the energy density of the battery cell 7.

[0142] In addition, by setting the range of the dimension E of the first support structure 112 along the thickness direction Z of the cover to 4mm≤E≤6mm, and setting the range of the dimension F of the main structure 111 along the thickness direction Z of the cover to 1.5mm≤F≤3mm, the dimension E of the first support structure 112 along the thickness direction Z of the cover is greater than the dimension F of the main structure 111 along the thickness direction Z of the cover. When the main structure 111 is heated and melted, the first support structure 112 can still support a space in the thickness direction Z of the cover that is greater than the thickness of the main structure 111, so that a gap 12 is formed between the main structure 111 and the electrode body for passing the discharged substance to the exhaust channel 1111.

[0143] In some embodiments, the first support structure 112 is configured as a ceramic structure.

[0144] The first support structure 112 is configured as a ceramic structure, which means that the first support structure 112 is made of ceramic material, so that the first support structure 112 has a high heat resistance temperature and a large structural strength, which can meet the heat resistance requirements and the support requirements for the electrode assembly 8.

[0145] For example, the first support structure 112 may also be made of high-melting-point polymer materials such as polyimide, composite materials such as mica composites, etc.

[0146] Some embodiments of this application also provide a battery device 2, which includes the battery cell 7 provided in the above-described technical solution. Because the battery device 2 includes the battery cell 7 provided in the above-described technical solution, the battery device 2 has high reliability.

[0147] Some embodiments of this application also provide an electrical device, which includes the battery device 2 provided by the above-described technical solution, the battery device 2 being used to provide electrical energy.

[0148] The electrical device can be any of the aforementioned devices or systems that utilize battery device 2.

[0149] Some embodiments of this application provide a battery cell 7, which includes an electrode assembly 8, a housing 9, a pressure relief mechanism 10, and an insulating member 11. The housing 9 includes a shell 91 and a cover 92. The shell 91 forms a cavity with an opening. The electrode assembly 8 is located in the cavity. The cover 92 closes to the opening. The pressure relief mechanism 10 is disposed on the cover 92. The main structure 111 of the insulating member 11 is connected to the cover 92 through a connecting structure 113 to form a gap 13 between the main structure 111 and the cover 92. A first support structure 112 protruding from the surface of the main structure 111 toward the cavity abuts against the electrode assembly 8 to form a gap 12 between the main structure 111 and the electrode assembly 8. The first support structure 112 is provided with a first through hole 1123, which penetrates the first support structure 112 along the thickness direction Z of the cover and communicates with the gap 13. The first support structure 112 is provided with a second through hole 1124, which penetrates the first support structure 112 along the length direction X of the cover and communicates with the gap 12. The heat resistance temperature of the first support structure 112 is set to D, where D≥500℃.

[0150] In the above structure, since the first support structure 112 protrudes from the surface of the main structure 111 toward the cavity and abuts against the electrode assembly 8, a gap 12 can be formed between the main structure 111 and the electrode assembly 8. In addition, the heat resistance temperature D of the first support structure 112 is in the range of D≥500℃. When the battery cell 7 experiences thermal runaway and temperature rise, the first support structure 112 can still maintain its original shape and abut against the electrode assembly 8, so that a gap 12 is maintained between the main structure 111 and the electrode assembly 8. The released substances generated inside the battery cell 7 can be smoothly discharged through the gap 12, the exhaust channel 1111 and the pressure relief mechanism 10, reducing the possibility of the battery cell 7 exploding or other dangers, and improving the reliability of the battery cell 7.

[0151] 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 cell, characterized in that, include: Electrode assembly; The housing includes a shell and a cover, the shell forming a cavity with an opening, the electrode assembly being located in the cavity, and the cover closing onto the opening; A pressure relief mechanism is provided on the cover. An insulating element is located between the cover and at least a portion of the electrode assembly. The insulating element includes an interconnected main structure and a first support structure. The main structure is connected to the surface of the cover facing the cavity and has an exhaust channel that connects the cavity to the pressure relief mechanism. Along the thickness direction of the cover, the first support structure protrudes from the surface of the main structure facing the cavity and abuts against the electrode assembly to form a gap between the main structure and the electrode assembly. The heat resistance temperature of the first support structure is set to D, where D ≥ 400°C.

2. The battery cell according to claim 1, characterized in that, The main structure is provided with a stepped hole. The first support structure includes a supporting part and a connecting part that are connected to each other. The connecting part protrudes from the outer peripheral surface of the supporting part. The connecting part is fitted to the large diameter section of the stepped hole. The supporting part is fitted to the small diameter section of the stepped hole. The supporting part extends from the small diameter section of the stepped hole and abuts against the electrode assembly.

3. The battery cell according to claim 1, characterized in that, The insulating component also includes a connecting structure connected to the main structure. Along the thickness direction of the cover, the connecting structure protrudes from the surface of the main structure facing the cover and is connected to the cover.

4. The battery cell according to claim 3, characterized in that, A gap is formed between the main structure and the cover, and the gap is connected to the pressure relief mechanism.

5. The battery cell according to claim 4, characterized in that, The surface of the first support structure facing the cover is flush with the surface of the main structure facing the cover. The first support structure is provided with a first through hole, which penetrates the first support structure along the thickness direction of the cover and communicates with the gap.

6. The battery cell according to claim 5, characterized in that, The connecting structure and the main structure are integrally formed.

7. The battery cell according to any one of claims 1-6, characterized in that, The first support structure is provided with a second through hole, which extends through the first support structure along the length of the cover and communicates with the gap.

8. The battery cell according to any one of claims 1-6, characterized in that, The insulating component includes at least two first support structures, which are respectively disposed on both sides of the exhaust channel along the length direction of the cover.

9. The battery cell according to any one of claims 1-6, characterized in that, The insulating component further includes a second support structure connected to the main structure. Along the thickness direction of the cover, the second support structure protrudes from the surface of the main structure facing the cavity and abuts against the electrode assembly. Along the thickness direction of the cover, at least a portion of the orthographic projection of the second support structure is located within the orthographic projection range of the exhaust channel. The second support structure is provided with a third through hole, which penetrates the second support structure along the length direction of the cover and connects the exhaust channel with the gap.

10. The battery cell according to claim 9, characterized in that, The first support structure extends along the width direction of the cover, and the second support structure extends along the width direction of the cover.

11. The battery cell according to any one of claims 1-6, characterized in that, Along the thickness direction of the cover, the dimension of the first support structure is set to E, 4mm≤E≤6mm, and the dimension of the main structure is set to F, 1.5mm≤F≤3mm.

12. The battery cell according to any one of claims 1-6, characterized in that, The first support structure is configured as a ceramic structure.

13. A battery device, characterized in that, The battery cell as described in any one of claims 1-12.

14. An electrical appliance, characterized in that, Includes the battery device as described in claim 13, the battery device being used to provide electrical energy.

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