Battery cell, battery device, and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, and the battery monomer comprises a housing which defines a mounting cavity; the electrode assembly is arranged in the mounting cavity; the positioning structure is arranged in the mounting cavity, the positioning structure is arranged on at least one side of the electrode assembly in the first direction of the battery monomer, the positioning structure is fixedly connected with the electrode assembly and the shell, and an exhaust channel communicated with the mounting cavity is formed in the positioning structure. Therefore, by arranging the positioning structure, the shaking risk of the electrode assembly is reduced, so that the extrusion risk of the corner of the electrode assembly is reduced, and the working performance of the battery monomer is favorably improved; high-pressure gas in the mounting cavity, which is far away from the explosion-proof structure of the battery monomer, can flow to the explosion-proof structure through the exhaust channel, so that the battery monomer can exhaust and release pressure, the explosion risk of the battery monomer is reduced, and the use safety of the battery monomer is improved.

Description

Technical Field

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

[0002] In related technologies, existing battery cells have a casing and an electrode assembly. The electrode assembly is located inside the casing, and the end cap of the casing has an explosion-proof structure. The electrode assembly is prone to shaking inside the casing, and the structural components between the electrode assembly and the casing block the gap between them. When the pressure inside the battery cell increases, for example, when the battery cell experiences thermal runaway, high-pressure gas that is far from the explosion-proof structure of the battery cell does not easily flow to the explosion-proof structure, which is not conducive to the venting and depressurization of the battery cell and affects the safety of the battery cell in use. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, one objective of this application is to provide a battery cell that reduces the risk of electrode assembly vibration, facilitates venting and depressurization in the event of thermal runaway, reduces the risk of explosion, and thus improves the safety of the battery cell in use.

[0004] This application also proposes a battery device.

[0005] This application also proposes an electrical device.

[0006] In a first aspect, embodiments of this application provide a single battery cell, comprising:

[0007] The housing defines the mounting cavity;

[0008] Electrode assembly, the electrode assembly is located inside the mounting cavity;

[0009] The positioning structure is located inside the mounting cavity and along the first direction of the battery cell. At least one side of the electrode assembly is provided with the positioning structure. The positioning structure is fixedly connected to both the electrode assembly and the housing. The positioning structure forms an exhaust channel that communicates with the mounting cavity.

[0010] In the above technical solution, by setting a positioning structure connected between the electrode assembly and the outer shell, the electrode assembly can be fixed inside the outer shell, reducing the risk of electrode assembly shaking and thus reducing the risk of compression at the corners of the electrode assembly. This is beneficial to improving the working performance of the battery cell. Furthermore, in the event of thermal runaway of the battery cell, the connection between the exhaust channel and the mounting cavity allows high-pressure gas in the mounting cavity that is far from the explosion-proof structure of the battery cell to flow to the explosion-proof structure through the exhaust channel. This facilitates the venting and depressurization of the battery cell, reduces the risk of battery cell explosion, and thus improves the safety of battery cell use.

[0011] In some embodiments, along a first direction, a medium flow groove is formed on the surface of the positioning structure opposite to the electrode assembly, and the medium flow groove is configured as an exhaust channel.

[0012] In the above technical solution, by forming a medium flow groove on the surface of the positioning structure away from the electrode assembly along the first direction, the exhaust channel can be set up, thereby simplifying the structure of the positioning structure, making it easy to form an exhaust channel on the positioning structure, which is conducive to improving the production efficiency of the positioning structure, and thus conducive to improving the production efficiency of the battery cell.

[0013] In some embodiments, a medium flow channel is formed within the positioning structure, and the medium flow channel is configured as an exhaust channel.

[0014] In the above technical solution, by forming an exhaust channel within the positioning structure, the risk of the internal structural components of the battery cell blocking the exhaust channel is reduced, thereby allowing gas to flow through the exhaust channel, which is beneficial to improving the working performance of the battery cell.

[0015] In some embodiments, the exhaust channel includes at least one of a first exhaust channel and a second exhaust channel. The first exhaust channel extends along a second direction of the battery cell and penetrates the positioning structure, and the second exhaust channel extends along a third direction of the battery cell and penetrates the positioning structure. The first direction, the second direction, and the third direction are perpendicular to each other.

[0016] In the above technical solution, the exhaust channel, including at least one of the first exhaust channel and the second exhaust channel, facilitates the flow of gas inside the battery cell between the electrode assembly and the casing, which is more conducive to the exhaust and pressure relief of the battery cell, reduces the risk of battery cell explosion, and further improves the safety of battery cell use.

[0017] In some embodiments, the total cross-sectional area of ​​the first exhaust channel is S1, the side of the electrode assembly with the positioning structure is spaced apart from the housing to form an installation space, the positioning structure is installed in the installation space, and the cross-sectional area of ​​the installation space along the second direction is S2, satisfying the relationship: 5%S2≤S1≤95%S2.

[0018] In the above technical solution, the ratio of the total cross-sectional area of ​​the first exhaust channel to the cross-sectional area of ​​the installation space along the second direction is greater than or equal to 0.05 and less than or equal to 0.95. When the battery cell experiences thermal runaway, the positioning structure can have sufficient structural strength to support the electrode assembly, which is beneficial to reducing the risk of electrode assembly shaking, while ensuring that the gas flows quickly from the first exhaust channel to the explosion-proof structure and facilitates the exhaust and pressure relief of the battery cell.

[0019] In some embodiments, the total cross-sectional area of ​​the second exhaust channel is S3, the side of the electrode assembly with the positioning structure is spaced apart from the housing to form an installation space, the positioning structure is installed in the installation space, and the cross-sectional area of ​​the installation space along the third direction is S4, satisfying the relationship: 5%S4≤S3≤95%S4.

[0020] In the above technical solution, the ratio of the total cross-sectional area of ​​the second exhaust channel to the cross-sectional area of ​​the installation space along the third direction is greater than or equal to 0.05 and less than or equal to 0.95. When the battery cell experiences thermal runaway, the positioning structure can have sufficient structural strength to support the electrode assembly while ensuring that the gas flows quickly from the second exhaust channel to the explosion-proof structure and the battery cell is depressurized. This helps to reduce the risk of electrode assembly shaking.

[0021] In some embodiments, the exhaust passage includes a first exhaust passage and a second exhaust passage, which are arranged in an intersecting manner.

[0022] In the above technical solution, by intersecting the first and second exhaust channels, the battery cell can have exhaust capabilities in both the second and third directions. This is more conducive to the flow of gas within the battery cell between the electrode assembly and the casing, and more conducive to the exhaust and pressure relief of the battery cell. This improves the exhaust and pressure relief capability of the battery cell, reduces the risk of battery cell explosion, and further enhances the safety of battery cell use.

[0023] In some embodiments, the positioning structure is an expanding adhesive.

[0024] In the above technical solution, by setting the positioning structure as an expanding adhesive, the electrode assembly can be reliably fixed in the shell, further reducing the risk of the electrode assembly shaking inside the shell. In addition, the expanding adhesive has a venting channel, which also enables the positioning structure to have a venting function, so that the battery cell has a normal pressure relief function when thermal runaway occurs, reducing the risk of battery cell explosion.

[0025] In some embodiments, along a first direction, the orthographic projection of the electrode assembly lies within the orthographic projection of the positioning structure.

[0026] In the above technical solution, by having the orthographic projection of the electrode assembly located within the orthographic projection of the positioning structure, the positioning structure can cover the side of the electrode assembly along the first direction, which is beneficial to increase the installation area of ​​the positioning structure. The positioning structure can reliably support the electrode assembly, enabling the electrode assembly to be more firmly fixed in the shell, further reducing the risk of the electrode assembly shaking, and thus further reducing the risk of the corner of the electrode assembly being squeezed.

[0027] In some embodiments, the positioning structure is strip-shaped and there are multiple positioning structures, which are arranged sequentially at intervals along the second direction, and each positioning structure extends along the third direction of the battery cell.

[0028] In the above technical solution, by arranging multiple positioning structures at intervals along the second direction, a third exhaust channel can be formed between two adjacent positioning structures while fixing the electrode assembly inside the shell. The third exhaust channel extends along the third direction of the battery cell and has an exhaust function, which helps to improve the exhaust capacity of the battery cell in the third direction. This helps to increase the setting area of ​​the exhaust channel. In the event of thermal runaway of the battery cell, it is more conducive to the exhaust and pressure relief of the battery cell, further reducing the risk of battery cell explosion and thus further improving the safety of battery cell use.

[0029] In some embodiments, along the first direction, the side surface area of ​​the electrode assembly is S5, and the total area of ​​the plurality of positioning structures is S6, satisfying the relationship: 2%S5≤S6≤4%S5.

[0030] In the above technical solution, by using 2%S5≤S6≤4%S5, the area of ​​the positioning structure can be reasonably set. While satisfying the requirements of fixing the electrode assembly, it can also enable the battery cell to have sufficient venting capacity. In the event of thermal runaway of the battery cell, it is more conducive to venting and depressurizing the battery cell, further reducing the risk of battery cell explosion, and thus further improving the safety of battery cell use.

[0031] Secondly, embodiments of this application also provide a battery device, including the aforementioned battery cell.

[0032] Thirdly, embodiments of this application also provide an electrical device, including the battery device described above.

[0033] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0034] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0035] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0036] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0037] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0038] Figure 4 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0039] Figure 5 A schematic diagram showing the exhaust channel of a battery cell extending in a second direction, as provided in some embodiments of this application;

[0040] Figure 6 A top view of the exhaust channel of the positioning structure provided in some embodiments of this application extending along a second direction;

[0041] Figure 7 This is a cross-sectional schematic diagram of the positioning structure provided in some embodiments of this application;

[0042] Figure 8 A schematic diagram showing the exhaust channel of a battery cell extending in a third direction, as provided in some embodiments of this application;

[0043] Figure 9 A top view of the exhaust channel of the positioning structure provided in some embodiments of this application, extending along a second direction and a third direction;

[0044] Figure 10 A cross-sectional view of a battery cell with multiple positioning structures provided in some embodiments of this application;

[0045] Figure 11 A side view of a battery cell with multiple positioning structures provided in some embodiments of this application;

[0046] Figure 12 This is a schematic diagram of an exhaust channel formed within a positioning structure provided in some embodiments of this application.

[0047] Figure label:

[0048] 100 for a single battery cell;

[0049] 10. Outer shell; 11. Mounting cavity; 12. Shell body; 13. End cap; 14. First side wall; 15. Second side wall; 16. Explosion-proof structure;

[0050] Electrode assembly 20;

[0051] Positioning structure 30;

[0052] Exhaust passage 31; First exhaust passage 311; Second exhaust passage 312;

[0053] Medium flow channel 32; Medium flow channel 33; Third exhaust channel 34;

[0054] Installation space 40; side support plate 50;

[0055] Battery assembly 200; housing 201; first housing 202; second housing 203;

[0056] Electrical device 300; controller 301; motor 302. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0058] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0059] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0060] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0061] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0062] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0063] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0064] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0065] In this application, "multiple" means two or more (including two).

[0066] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0067] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0068] Battery cells can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to any of these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to any of these types either.

[0069] The battery apparatus 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 connected in series, parallel, or mixed connections via a busbar.

[0070] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0071] 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.

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

[0073] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0074] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0075] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0076] 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.

[0077] 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.

[0078] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0079] A battery cell includes a casing, electrode assembly, and electrolyte. The casing houses the electrode assembly and electrolyte. The electrode assembly consists of an anode electrode, a cathode electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the anode and cathode electrodes. The anode electrode includes an anode current collector and an anode active material layer. The anode active material layer is coated on the surface of the anode current collector. The uncoated anode current collector protrudes beyond the coated anode current collector and serves as the anode tab. Taking a lithium-ion battery as an example, the anode current collector can be made of aluminum, and the anode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The cathode electrode includes a cathode current collector and a cathode active material layer. The cathode active material layer is coated on the surface of the cathode current collector. The uncoated cathode current collector protrudes beyond the coated cathode current collector and serves as the cathode tab. The cathode current collector can be made of copper, and the cathode active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple anode tabs stacked together, and there are multiple cathode tabs stacked together.

[0080] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0081] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the battery device, as the power source, plays an irreplaceable and crucial role. A battery cell has a casing and electrode assemblies. The electrode assemblies are housed within the casing, and the end caps of the casing are equipped with explosion-proof structures. However, the electrode assemblies are prone to movement within the casing. Furthermore, when the pressure inside the battery cell increases, for example, during thermal runaway, high-pressure gas located far from the explosion-proof structure is less likely to flow towards it. For instance, high-pressure gas at the bottom of the battery cell is less likely to flow towards the explosion-proof structure, hindering the venting and depressurization of the battery cell and affecting its safety.

[0082] Based on the above considerations, in order to solve the problems of high-pressure gas being difficult to flow to the explosion-proof structure at a distance from the battery cell and the problem of electrode assembly shaking, a battery cell was designed after in-depth research, including: a shell defining an installation cavity; an electrode assembly disposed within the installation cavity; and a positioning structure disposed within the installation cavity. Along a first direction of the battery cell, at least one side of the electrode assembly is provided with the positioning structure, the positioning structure is fixedly connected to both the electrode assembly and the shell, and the positioning structure forms an exhaust channel communicating with the installation cavity.

[0083] In this type of battery cell, the positioning structure reduces the risk of electrode assembly swaying, thereby reducing the risk of compression at the corners of the electrode assembly. This is beneficial to improving the working performance of the battery cell. Furthermore, in the event of thermal runaway in the battery cell, it facilitates the flow of high-pressure gas from a distance of a certain distance from the explosion-proof structure within the mounting cavity to different locations within the mounting cavity through the exhaust channel. This facilitates the flow of high-pressure gas towards the explosion-proof structure, thereby promoting the venting and depressurization of the battery cell, reducing the risk of explosion, and ultimately improving the safety of the battery cell in use.

[0084] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device 300 according to an embodiment of this application.

[0085] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 200 is installed inside the vehicle, and the battery device 200 can be located at the bottom, front, or rear of the vehicle. The battery device 200 can be used to power the vehicle; for example, the battery device 200 can serve as the vehicle's operating power source. The vehicle may also include a controller 301 and a motor 302. The controller 301 is used to control the battery device 200 to supply power to the motor 302, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0086] In some embodiments of this application, the battery device 200 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0087] Please refer to Figure 2 , Figure 2This is an exploded view of the structure of a battery device 200 provided in some embodiments of this application. The battery device 200 includes a housing 201 and a plurality of battery cells 100, which are housed within the housing 201. The housing 201 provides assembly space for the battery cells 100, and the housing 201 can adopt various structures. In some embodiments, the housing 201 may include a first housing 202 and a second housing 203, which overlap each other, and the first housing 202 and the second housing 203 together define an assembly space for accommodating the battery cells 100. The second housing 203 can be a hollow structure open at one end, and the first housing 202 can be a plate-like structure. The first housing 202 covers the open side of the second housing 203 so that the first housing 202 and the second housing 203 together define the assembly space. Alternatively, the first housing 202 and the second housing 203 can both be hollow structures open on one side, with the open side of the first housing 202 covering the open side of the second housing 203. Of course, the housing 201 formed by the first housing 202 and the second housing 203 can be of various shapes, such as a cylinder, a cuboid, etc.

[0088] The following is for reference. Figures 3-12 A battery cell 100 according to an embodiment of this application is described.

[0089] According to some embodiments of this application, reference is made to Figures 3-12 This application provides a battery cell 100, including: a housing 10 defining a mounting cavity 11; an electrode assembly 20 disposed within the mounting cavity 11; and a positioning structure 30 disposed within the mounting cavity 11. Along a first direction of the battery cell 100, at least one side of the electrode assembly 20 is provided with the positioning structure 30, which is fixedly connected to both the electrode assembly 20 and the housing 10. The positioning structure 30 forms an exhaust channel 31 communicating with the mounting cavity 11.

[0090] The battery cell 100 includes a housing 10, an electrode assembly 20, and a positioning structure 30. The housing 10 includes a housing body 12 and an end cap 13. The housing body 12 has an open end, and the end cap 13 is fixed to the housing body 12 and covers the open end of the housing body 12, thereby defining a mounting cavity 11 together. The housing body 12 may have at least one open end, and the number of end caps 13 is equal to the number of open ends of the housing body 12. The open ends of the housing body 12 and the end caps 13 are assembled in a one-to-one correspondence. At least one of the end caps 13 and the housing body 12 may be provided with an explosion-proof structure 16, which may be an explosion-proof valve, an explosion-proof membrane, etc. This application uses the example of the end cap 13 being provided with an explosion-proof structure 16 for illustration. The positioning structure 30 and the electrode assembly 20 are both disposed within the mounting cavity 11. Along the first direction of the battery cell 100, when the battery cell 100 is positioned... Figure 3When placed at a mid-angle, the first direction is Figure 3 In the X direction, along the first direction, at least one side of the electrode assembly 20 is spaced apart from the housing 10. A positioning structure 30 is provided on one side of the electrode assembly 20, or a positioning structure 30 is provided on both sides of the electrode assembly 20. This application will describe the electrode assembly 20 with a positioning structure 30 on both sides along the first direction as an example.

[0091] It should be noted that, along the first direction, the electrode assembly 20 has two oppositely arranged sides, which are two relatively narrow sides of the electrode assembly 20. The positioning structure 30 is disposed between the two relatively narrow sides of the electrode assembly 20 and the sidewall of the outer shell 10. Further, the shell body 12 may have two first sidewalls 14 and two second sidewalls 15. The two first sidewalls 14 are opposite and spaced apart along the first direction, and the two second sidewalls 15 are connected between the two first sidewalls 14. The two second sidewalls 15 are opposite and spaced apart along a third direction. The area of ​​the first sidewall 14 is smaller than the area of ​​the second sidewall 15. The first sidewall 14 is the narrow surface of the outer shell 10, and the second sidewall 15 is the large surface of the outer shell 10. The two relatively narrow sides of the electrode assembly 20 are respectively arranged opposite to the two first sidewalls 14.

[0092] The positioning structure 30 can be directly and fixedly connected to the electrode assembly 20, or indirectly and fixedly connected to the electrode assembly 20 via an adapter. The positioning structure 30 can also be directly and fixedly connected to the outer casing 10, or indirectly and fixedly connected to the outer casing 10 via an adapter. Alternatively, the positioning structure 30 can be fixedly connected to both the electrode assembly 20 and the outer casing 10 by adhesive bonding. By providing the positioning structure 30, which connects the electrode assembly 20 and the outer casing 10, the positioning structure 30 can support the electrode assembly 20, ensuring it is fixed within the outer casing 10. This reduces the risk of the electrode assembly 20 shaking and the risk of pressure at the corners of the electrode assembly 20, thus improving the performance of the battery cell 100.

[0093] The positioning structure 30 has an exhaust channel 31 communicating with the mounting cavity 11. The exhaust channel 31 extends through the positioning structure 30. The positioning structure 30 can be a plastic part or an expanding rubber component. By setting the positioning structure 30, an exhaust channel 31 can be formed between the electrode assembly 20 and the outer casing 10. In the event of thermal runaway of the battery cell 100, high-pressure gas in the mounting cavity 11 that is far from the explosion-proof structure 16 of the battery cell 100 can flow through the exhaust channel 31 between the electrode assembly 20 and the outer casing 10 to a location in the mounting cavity 11 that facilitates gas flow to the explosion-proof structure 16. This facilitates the flow of high-pressure gas in the mounting cavity 11 to the explosion-proof structure 16, promotes the venting and depressurization of the battery cell 100, reduces the risk of explosion of the battery cell 100, and thus improves the safety of the battery cell 100.

[0094] In the above technical solution, by setting a positioning structure 30, which is connected between the electrode assembly 20 and the outer shell 10, the electrode assembly 20 can be fixed inside the outer shell 10, reducing the risk of the electrode assembly 20 shaking, thereby reducing the risk of the corner of the electrode assembly 20 being squeezed, which is beneficial to improving the working performance of the battery cell 100. Furthermore, when the battery cell 100 experiences thermal runaway, the exhaust channel 31 is connected to the mounting cavity 11, which is beneficial to allow the high-pressure gas in the mounting cavity 11 that is far from the explosion-proof structure 16 of the battery cell 100 to flow to the explosion-proof structure 16 through the exhaust channel 31, thereby facilitating the exhaust and depressurization of the battery cell 100, reducing the risk of the battery cell 100 exploding, and thus improving the safety of the battery cell 100 in use.

[0095] According to some embodiments of this application, such as Figure 5 and Figure 8 As shown, along the first direction, a medium flow groove 32 is formed on the surface of the positioning structure 30 opposite to the electrode assembly 20, and the medium flow groove 32 is configured as an exhaust channel 31.

[0096] The positioning structure 30 has a medium flow groove 32 formed on its surface opposite to the electrode assembly 20. Alternatively, the positioning structure 30 can be understood as having a medium flow groove 32 formed on its surface facing the outer shell 10. The medium flow groove 32 is recessed towards the interior of the positioning structure 30 along a first direction. The depth of the medium flow groove 32 can be reasonably selected and designed according to actual conditions, and is not specifically limited here. The medium flow groove 32 is constructed as an exhaust channel 31.

[0097] In the above technical solution, by forming a medium flow groove 32 on the surface of the positioning structure 30 away from the electrode assembly 20 along the first direction, the exhaust channel 31 can be set, thereby simplifying the structure of the positioning structure 30, making it easier to form the exhaust channel 31 on the positioning structure 30, which is conducive to improving the production efficiency of the positioning structure 30, and thus conducive to improving the production efficiency of the battery cell 100.

[0098] According to some embodiments of this application, such as Figure 12 As shown, a medium flow channel 33 is formed within the positioning structure 30, and the medium flow channel 33 is constructed as an exhaust channel 31.

[0099] The positioning structure 30 contains a medium flow channel 33, which extends to the end of the positioning structure 30 along its extension direction. Alternatively, the medium flow channel 33 can be understood as penetrating the positioning structure 30 along its extension direction. In this embodiment, the medium flow channel 33 is formed within the positioning structure 30 and serves as an exhaust channel 31.

[0100] In the above technical solution, by forming an exhaust channel 31 inside the positioning structure 30, the risk of the internal structural components of the battery cell 100 blocking the exhaust channel 31 is reduced, so that gas can flow through the exhaust channel 31, which is beneficial to improving the working performance of the battery cell 100.

[0101] According to some embodiments of this application, the exhaust channel 31 includes at least one of a first exhaust channel 311 and a second exhaust channel 312. The first exhaust channel 311 extends along a second direction of the battery cell 100 and penetrates the positioning structure 30, and the second exhaust channel 312 extends along a third direction of the battery cell 100 and penetrates the positioning structure 30. The first direction, the second direction and the third direction are perpendicular to each other.

[0102] The exhaust passage 31 includes at least one of the first exhaust passage 311 and the second exhaust passage 312. That is, the exhaust passage 31 includes the first exhaust passage 311, or the exhaust passage 31 includes the second exhaust passage 312, or the exhaust passage 31 includes the first exhaust passage 311 and the second exhaust passage 312.

[0103] like Figure 3 , Figure 4 , Figure 6 and Figure 11 As shown, the exhaust channel 31 includes a first exhaust channel 311, which extends along the second direction of the battery cell 100 and penetrates the positioning structure 30 along the second direction. Further, there can be at least one first exhaust channel 311. When there are multiple first exhaust channels 311, they are arranged along a third direction. The first exhaust channel 311 can be parallel to the second direction, or it can extend obliquely along the second direction. This application uses the example of the first exhaust channel 311 being parallel to the second direction for illustration. The second direction is... Figure 3 , Figure 4In the Y direction, the first exhaust channel 311 extends along the second direction. The first exhaust channel 311 can connect the two sides of the electrode assembly 20 along the second direction. Gas can flow along the first exhaust channel 311 in the two sides of the electrode assembly 20 along the second direction, so that the battery cell 100 has the ability to exhaust in the second direction.

[0104] like Figure 3 and Figure 8 As shown, the exhaust channel 31 includes a second exhaust channel 312, which extends along a third direction of the battery cell 100 and penetrates the positioning structure 30 along the third direction. Further, there can be at least one second exhaust channel 312. When there are multiple second exhaust channels 312, they are arranged along a second direction. The second exhaust channel 312 can be parallel to the third direction, or it can extend obliquely along the third direction. This application uses the example of the second exhaust channel 312 being parallel to the third direction for illustration. The third direction is... Figure 3 In the Z direction, Figure 8 In the diagram, the third direction is perpendicular to the plane of the paper. The second exhaust channel 312 extends along the third direction and can connect the two sides of the electrode assembly 20 along the third direction. Gas can flow along the second exhaust channel 312 in the two sides of the electrode assembly 20 along the third direction, thereby enabling the battery cell 100 to have exhaust capability in the third direction.

[0105] like Figure 9 As shown, the exhaust channel 31 includes a first exhaust channel 311 and a second exhaust channel 312 in the above embodiments. The first exhaust channel 311 extends along a second direction and can connect the two sides of the electrode assembly 20 along the second direction, allowing gas to flow along the first exhaust channel 311 in the two sides of the electrode assembly 20 along the second direction. The second exhaust channel 312 can connect the two sides of the electrode assembly 20 along a third direction, allowing gas to flow along the second exhaust channel 312 in the two sides of the electrode assembly 20 along the third direction, thereby enabling the battery cell 100 to have exhaust capabilities in both the second and third directions.

[0106] In the above technical solution, the exhaust channel 31 includes at least one of the first exhaust channel 311 and the second exhaust channel 312, which facilitates the flow of gas in the battery cell 100 between the electrode assembly 20 and the outer casing 10, and is more conducive to the exhaust and pressure relief of the battery cell 100, reducing the risk of the battery cell 100 exploding, and thus further improving the safety of the battery cell 100.

[0107] According to some embodiments of this application, such as Figure 3 , Figure 4 , Figure 6 and Figure 11 As shown, the total cross-sectional area of ​​the first exhaust channel 311 is S1. The side of the electrode assembly 20 with the positioning structure 30 is spaced apart from the outer shell 10 to form an installation space 40. The positioning structure 30 is installed in the installation space 40. The cross-sectional area of ​​the installation space 40 along the second direction is S2, which satisfies the relationship: 5%S2≤S1≤95%S2.

[0108] When the positioning structure 30 forms a first exhaust channel 311, the side of the electrode assembly 20 with the positioning structure 30 is spaced apart from the outer shell 10, forming an installation space 40 between the side of the electrode assembly 20 with the positioning structure 30 and the outer shell 10, and the corresponding positioning structure 30 is installed in the installation space 40. When there is one first exhaust channel 311, the total cross-sectional area S1 of the first exhaust channel 311 refers to the cross-sectional area of ​​one first exhaust channel 311. When there are multiple first exhaust channels 311, the total cross-sectional area S1 of the first exhaust channels 311 refers to the sum of the cross-sectional areas of the multiple first exhaust channels 311. The cross-sectional area S2 of the installation space 40 along the second direction refers to the cross-sectional area of ​​the installation space 40 obtained by cutting the installation space 40 with a plane defined by the first direction and the third direction; in other words, the cross-sectional area of ​​the installation space 40 obtained by cutting the installation space 40 with a plane perpendicular to the second direction. 5%S2≤S1≤95%S2, where S1 and S2 have the same unit. The ratio of the total cross-sectional area of ​​the first exhaust passage 311 to the cross-sectional area of ​​the installation space 40 along the second direction is greater than or equal to 0.05 and less than or equal to 0.95. The ratio of the total cross-sectional area of ​​the first exhaust passage 311 to the cross-sectional area of ​​the installation space 40 along the second direction can be 0.05, 0.55, 0.75, 0.95, etc.

[0109] If the ratio of the total cross-sectional area of ​​the first exhaust channel 311 to the cross-sectional area of ​​the installation space 40 along the second direction is less than 0.05, the cross-sectional area of ​​the first exhaust channel 311 along the second direction is relatively small. This hinders the rapid flow of gas from the first exhaust channel 311 to the explosion-proof structure 16 when the battery cell 100 experiences thermal runaway, thus impeding the venting and depressurization of the battery cell 100. If the ratio of the total cross-sectional area of ​​the first exhaust channel 311 to the cross-sectional area of ​​the installation space 40 along the second direction is greater than 0.95, it affects the structural strength of the positioning structure 30.

[0110] In this application, the ratio of the total cross-sectional area of ​​the first exhaust channel 311 to the cross-sectional area of ​​the installation space 40 along the second direction is greater than or equal to 0.05 and less than or equal to 0.95. When the battery cell 100 experiences thermal runaway, the positioning structure 30 can have sufficient structural strength to support the electrode assembly 20, based on the premise that the gas can flow quickly from the first exhaust channel 311 to the explosion-proof structure 16, which is conducive to the exhaust and pressure relief of the battery cell 100, thereby reducing the risk of the electrode assembly 20 shaking.

[0111] According to some embodiments of this application, such as Figure 3 and Figure 8 As shown, the total cross-sectional area of ​​the second exhaust channel 312 is S3. The side of the electrode assembly 20 with the positioning structure 30 is spaced apart from the outer shell 10 to form an installation space 40. The positioning structure 30 is installed in the installation space 40. The cross-sectional area of ​​the installation space 40 along the third direction is S4, which satisfies the relationship: 5%S4≤S3≤95%S4.

[0112] When the positioning structure 30 forms a second exhaust channel 312, the side of the electrode assembly 20 with the positioning structure 30 is spaced apart from the outer shell 10, forming an installation space 40 between the side of the electrode assembly 20 with the positioning structure 30 and the outer shell 10, and the positioning structure 30 is installed within the installation space 40. When there is one second exhaust channel 312, the total cross-sectional area S3 of the second exhaust channel 312 refers to the cross-sectional area of ​​one second exhaust channel 312. When there are multiple second exhaust channels 312, the total cross-sectional area S3 of the second exhaust channels 312 refers to the sum of the cross-sectional areas of the multiple second exhaust channels 312. The cross-sectional area S4 of the installation space 40 along the third direction refers to the cross-sectional area of ​​the installation space 40 obtained by cutting the installation space 40 with a plane defined by the first and second directions; in other words, the cross-sectional area of ​​the installation space 40 obtained by cutting the installation space 40 with a plane perpendicular to the third direction. 5%S4≤S3≤95%S4, where S3 and S4 have the same unit. The ratio of the total cross-sectional area of ​​the second exhaust passage 312 to the cross-sectional area of ​​the installation space 40 along the third direction is greater than or equal to 0.05 and less than or equal to 0.95. The ratio of the total cross-sectional area of ​​the second exhaust passage 312 to the cross-sectional area of ​​the installation space 40 along the third direction can be 0.05, 0.55, 0.75, 0.95, etc.

[0113] If the ratio of the total cross-sectional area of ​​the second exhaust channel 312 to the cross-sectional area of ​​the installation space 40 along the third direction is less than 0.05, the cross-sectional area of ​​the second exhaust channel 312 along the third direction is small. When the battery cell 100 experiences thermal runaway, it will hinder the rapid flow of gas from the second exhaust channel 312 to the explosion-proof structure 16, and will also hinder the exhaust and pressure relief of the battery cell 100. If the ratio of the total cross-sectional area of ​​the second exhaust channel 312 to the cross-sectional area of ​​the installation space 40 along the third direction is greater than 0.95, it will affect the structural strength of the positioning structure 30.

[0114] In this application, the ratio of the total cross-sectional area of ​​the second exhaust channel 312 to the cross-sectional area of ​​the installation space 40 along a third direction is greater than or equal to 0.05 and less than or equal to 0.95. When the battery cell 100 experiences thermal runaway, the positioning structure 30 can have sufficient structural strength to support the electrode assembly 20, based on the premise that the gas can flow quickly from the second exhaust channel 312 to the explosion-proof structure 16, which is conducive to the exhaust and pressure relief of the battery cell 100, thereby reducing the risk of the electrode assembly 20 shaking.

[0115] According to some embodiments of this application, such as Figure 9 As shown, the exhaust passage 31 includes a first exhaust passage 311 and a second exhaust passage 312, which are arranged in an intersecting manner.

[0116] The exhaust passage 31 includes a first exhaust passage 311 and a second exhaust passage 312, which are arranged intersectingly. It should be noted that there is at least one first exhaust passage 311 and one second exhaust passage 312; this application uses the example of multiple first exhaust passages 311 and multiple second exhaust passages 312 for illustration. Multiple first exhaust passages 311 are arranged along a third direction and can be parallel to each other. Multiple second exhaust passages 312 are arranged along a second direction and can be parallel to each other. Each first exhaust passage 311 intersects with multiple second exhaust passages 312, and each second exhaust passage 312 intersects with multiple first exhaust passages 311.

[0117] In the above technical solution, by intersecting the first exhaust channel 311 and the second exhaust channel 312, the battery cell 100 can have exhaust capabilities in both the second and third directions. This is more conducive to the flow of gas inside the battery cell 100 between the electrode assembly 20 and the outer casing 10, and more conducive to the exhaust and depressurization of the battery cell 100. This is beneficial to improving the exhaust and depressurization capability of the battery cell 100, reducing the risk of explosion of the battery cell 100, and further improving the safety of the battery cell 100 in use.

[0118] According to some embodiments of this application, the positioning structure 30 is an expanding adhesive. The expanding adhesive forms a venting channel 31. Along a first direction, the expanding adhesive can be bonded between the electrode assembly 20 and the outer casing 10. The expanding adhesive can expand after the battery cell 100 is filled with electrolyte. After expansion, the expanding adhesive presses and fixes the electrode assembly 20, thus securing the electrode assembly 20 to the outer casing 10. This effectively reduces the risk of the electrode assembly 20 shaking inside the outer casing 10 and reduces the risk of the electrode assembly 20 being damaged.

[0119] In the above technical solution, by setting the positioning structure 30 as an expanding adhesive, the electrode assembly 20 can be reliably fixed inside the housing 10, further reducing the risk of the electrode assembly 20 shaking inside the housing 10. In addition, the expanding adhesive has an exhaust channel 31, which also enables the positioning structure 30 to have an exhaust function, so that the battery cell 100 has a normal pressure relief function when thermal runaway occurs, reducing the risk of the battery cell 100 exploding.

[0120] According to some embodiments of this application, such as Figure 4 and Figure 5 As shown, along the first direction, the orthographic projection of the electrode assembly 20 lies within the orthographic projection of the positioning structure 30.

[0121] Wherein, along the first direction, the orthographic projection area of ​​the electrode assembly 20 and the orthographic projection area of ​​the positioning structure 30 are equal, the orthographic projection range of the electrode assembly 20 and the orthographic projection range of the positioning structure 30 completely overlap along the first direction, or the orthographic projection area of ​​the electrode assembly 20 is smaller than the orthographic projection area of ​​the positioning structure 30, and the orthographic projection range of the electrode assembly 20 along the first direction is located within the orthographic projection range of the positioning structure 30.

[0122] In the above technical solution, by having the orthographic projection of the electrode assembly 20 located within the orthographic projection of the positioning structure 30, the positioning structure 30 can cover the side of the electrode assembly 20 along the first direction, which is beneficial to increase the installation area of ​​the positioning structure 30. The positioning structure 30 can reliably support the electrode assembly 20, which can make the electrode assembly 20 more firmly fixed in the outer shell 10, further reducing the risk of the electrode assembly 20 shaking, thereby further reducing the risk of the corner of the electrode assembly 20 being squeezed.

[0123] According to some embodiments of this application, such as Figure 10 and Figure 11 As shown, the positioning structure 30 is strip-shaped and there are multiple positioning structures 30 arranged sequentially at intervals along the second direction, and each positioning structure 30 extends along the third direction of the battery cell 100.

[0124] The positioning structure 30 is a long strip structure, and multiple positioning structures 30 are arranged sequentially at intervals along the second direction. The multiple positioning structures 30 can be arranged parallel to each other. Each positioning structure 30 extends along a third direction of the battery cell 100. The positioning structure 30 can extend obliquely along the third direction, or the positioning structure 30 can be parallel to the third direction. The structures of the multiple positioning structures 30 can be the same. The positioning structure 30 can form at least one of a first exhaust channel 311 and a second exhaust channel 312. In this embodiment, this application uses the positioning structure 30 forming a first exhaust channel 311 as an example for explanation.

[0125] In the above technical solution, by arranging multiple positioning structures 30 sequentially at intervals along the second direction, and fixing the electrode assembly 20 inside the housing 10, a third exhaust channel 34 can be formed between two adjacent positioning structures 30. The third exhaust channel 34 extends along the third direction of the battery cell 100 and has an exhaust function, which is beneficial to improving the exhaust capacity of the battery cell 100 in the third direction. This is beneficial to increasing the setting area of ​​the exhaust channel 31. When the battery cell 100 experiences thermal runaway, it is more conducive to the exhaust and pressure relief of the battery cell 100, further reducing the risk of the battery cell 100 exploding, and thus further improving the safety of the battery cell 100.

[0126] According to some embodiments of this application, along the first direction, the side area of ​​the electrode assembly 20 is S5, and the total area of ​​the plurality of positioning structures 30 is S6, satisfying the relationship: 2%S5≤S6≤4%S5.

[0127] When the positioning structure 30 is an expanding adhesive, the total area of ​​the multiple positioning structures 30 is the adhesive area on the side of the electrode assembly 20. Along the first direction, the side area of ​​the electrode assembly 20 refers to the area of ​​the side of the electrode assembly 20 projected orthographically along the first direction. The total area of ​​the multiple positioning structures 30 refers to the total area of ​​the multiple positioning structures 30 projected orthographically along the first direction. The total area of ​​the multiple positioning structures 30 is the sum of the areas of the multiple positioning structures 30 projected orthographically along the first direction. S5 and S6 have the same unit. The relationship is satisfied: 2%S5≤S6≤4%S5. In other words, the ratio of the total area S6 of the multiple positioning structures 30 to the side area S5 of the electrode assembly 20 is greater than or equal to 2% and less than or equal to 4%. The ratio of the total area S6 of the multiple positioning structures 30 to the side area S5 of the electrode assembly 20 can be 2%, 3%, 4%, etc.

[0128] In the above technical solution, by using 2%S5≤S6≤4%S5, the setting area of ​​the positioning structure 30 can be made reasonable. On the basis of fixing the electrode assembly 20, the battery cell 100 can have sufficient venting capacity. When the battery cell 100 experiences thermal runaway, it is more conducive to venting and depressurizing the battery cell 100, further reducing the risk of explosion of the battery cell 100, and thus further improving the safety of the battery cell 100.

[0129] According to some embodiments of this application, the battery cell 100 may further include: a side support plate 50, which is disposed in the mounting cavity 11. Along the first direction, the side support plate 50 is located between the electrode assembly 20 and the positioning structure 30, and the positioning structure 30 is indirectly fixedly connected to the electrode assembly 20 through the side support plate 50.

[0130] According to some embodiments of this application, this application also provides a battery device 200, including the battery cell 100 of the above embodiments, which reduces the risk of explosion of the battery device 200 and thereby improves the safety of the battery device 200.

[0131] According to some embodiments of this application, this application also provides an electrical device 300, including the battery device 200 of the above embodiments, which reduces the risk of explosion of the electrical device 300 and thereby improves the safety of the electrical device 300.

[0132] According to some embodiments of this application, such as Figure 3 , Figure 4 and 9As shown, this application provides a battery cell 100, which includes a housing 10, an electrode assembly 20, a positioning structure 30, and a side support plate 50. The housing 10 defines a mounting cavity 11, the electrode assembly 20 is disposed within the mounting cavity 11, the positioning structure 30 is an expanding adhesive, and the positioning structure 30 is disposed within the mounting cavity 11 along a first direction of the battery cell 100. Positioning structures 30 are provided on both sides of the electrode assembly 20, and a side support plate 50 is disposed between the electrode assembly 20 and the positioning structure 30. The side support plate 50 can be bonded and fixed to the electrode assembly 20. The positioning structure 30 is fixedly connected to both the side support plate 50 and the housing 10, and the positioning structure 30 forms an exhaust channel 31 communicating with the mounting cavity 11 along the first direction. On the opposite side of the positioning structure 30, a dielectric flow groove 32 is formed on the surface of the electrode assembly. The dielectric flow groove 32 is configured as an exhaust channel 31, which includes a first exhaust channel 311 and a second exhaust channel 312. The first exhaust channel 311 extends along a second direction of the battery cell 100 and penetrates the positioning structure 30, while the second exhaust channel 312 extends along a third direction of the battery cell 100 and penetrates the positioning structure 30. The first exhaust channel 311 and the second exhaust channel 312 are intersecting, and the first, second, and third directions are perpendicular to each other. It should be noted that the first direction is the width direction of the battery cell 100, the second direction is the length direction of the battery cell 100, and the third direction is the thickness direction of the battery cell 100.

[0133] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0134] Other components of the battery cell 100 according to the embodiments of this application, such as the terminals and plastic parts, as well as the operation, are known to those skilled in the art and will not be described in detail here.

[0135] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0136] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, include: A housing that defines a mounting cavity; An electrode assembly disposed within the mounting cavity; A positioning structure is provided inside the mounting cavity and along the first direction of the battery cell. The positioning structure is provided on at least one side of the electrode assembly. The positioning structure is fixedly connected to both the electrode assembly and the outer shell. The positioning structure forms an exhaust channel communicating with the mounting cavity.

2. The battery cell according to claim 1, characterized in that, Along the first direction, a medium flow groove is formed on the surface of the positioning structure opposite to the electrode assembly, and the medium flow groove is configured as the exhaust channel.

3. The battery cell according to claim 1, characterized in that, The positioning structure has a medium flow channel, which is configured as the exhaust channel.

4. The battery cell according to claim 1, characterized in that, The exhaust channel includes at least one of a first exhaust channel and a second exhaust channel. The first exhaust channel extends along a second direction of the battery cell and penetrates the positioning structure. The second exhaust channel extends along a third direction of the battery cell and penetrates the positioning structure. The first direction, the second direction, and the third direction are perpendicular to each other.

5. The battery cell according to claim 4, characterized in that, The total cross-sectional area of ​​the first exhaust channel is S1. The side of the electrode assembly with the positioning structure is spaced apart from the housing to form an installation space. The positioning structure is installed in the installation space. The cross-sectional area of ​​the installation space along the second direction is S2, satisfying the relationship: 5%S2≤S1≤95%S2.

6. The battery cell according to claim 4, characterized in that, The total cross-sectional area of ​​the second exhaust channel is S3. The side of the electrode assembly with the positioning structure is spaced apart from the housing to form an installation space. The positioning structure is installed in the installation space. The cross-sectional area of ​​the installation space along the third direction is S4, satisfying the relationship: 5%S4≤S3≤95%S4.

7. The battery cell according to claim 4, characterized in that, The exhaust passage includes a first exhaust passage and a second exhaust passage, which are arranged in an intersecting manner.

8. The battery cell according to claim 1, characterized in that, The positioning structure is an expanding adhesive.

9. The battery cell according to any one of claims 1-8, characterized in that, Along the first direction, the orthographic projection of the electrode assembly lies within the orthographic projection of the positioning structure.

10. The battery cell according to any one of claims 1-8, characterized in that, The positioning structure is strip-shaped and there are multiple positioning structures, which are arranged at intervals along the second direction, and each positioning structure extends along the third direction of the battery cell.

11. The battery cell according to claim 10, characterized in that, Along the first direction, the side surface area of ​​the electrode assembly is S5, and the total area of ​​the plurality of positioning structures is S6, satisfying the relationship: 2%S5≤S6≤4%S5.

12. A battery device, characterized in that, Includes the battery cell according to any one of claims 1-11.

13. An electrical appliance, characterized in that, Includes the battery device according to claim 12.

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