Battery cell, battery device, and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell, an electrode assembly and an insulating part, and the shell comprises a first wall; the electrode assembly is accommodated in the accommodating cavity of the shell; the insulating part is arranged on the side, facing the electrode assembly, of the first wall and provided with a boss protruding towards the electrode assembly, the boss is provided with a flow channel, the flow channel is communicated with the containing cavities in the two sides of the boss in the first direction, and the first direction intersects with the thickness direction of the first wall.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery cell, a battery device, and an electrical device. Background Art

[0002] Batteries are widely used in electronic devices, such as mobile phones, laptop computers, battery-powered vehicles, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the development of battery cell technology, in addition to improving the performance of battery cells, the reliability of battery cells is also an issue that needs to be considered. Therefore, how to improve the reliability of battery cells is an ongoing problem in battery cell technology. Summary of the Utility Model

[0004] The present application provides a battery cell, a battery device, and an electrical device to improve the reliability of the battery cell.

[0005] The present application is implemented by the following technical solutions:

[0006] In a first aspect, the battery cell provided by the embodiments of the present application includes a housing, an electrode assembly, and an insulating member. The housing includes a first wall; the electrode assembly is accommodated in the accommodation cavity of the housing; the insulating member is provided on the side of the first wall facing the electrode assembly. The insulating member has a convex platform protruding towards the electrode assembly. The convex platform has a flow channel, and the flow channel communicates with the accommodation cavities on both sides of the convex platform along a first direction. The first direction intersects with the thickness direction of the first wall.

[0007] For the battery cell provided by the embodiments of the present application, by providing that the convex platform of the insulating member has a flow channel and setting the flow channel to communicate with the accommodation cavities on both sides of the convex platform along the first direction, the fluidity of the electrolyte inside the battery cell is improved, which is beneficial to improving the utilization rate of the internal space of the battery cell by the electrolyte, and is beneficial to improving the wettability of the electrolyte to the electrode assembly, reducing the risk of lithium deposition on the electrode assembly, and further improving the reliability of the battery cell.

[0008] According to some embodiments of the present application, the first wall has a liquid injection hole, and the liquid injection hole is provided on the side of the projection of the convex platform along the thickness direction on the first wall along the first direction. The liquid injection hole communicates with the accommodation cavity and is used for injecting electrolyte into the accommodation cavity.

[0009] In the above solution, it is beneficial to improve the smoothness of electrolyte injection, and further beneficial to improve the utilization rate of the space of the accommodation cavity by the electrolyte, and improve the wettability of the electrolyte to the electrode assembly, and further reduce the risk of lithium deposition on the electrode assembly.

[0010] According to some embodiments of the present application, the insulating member has a stop portion, the stop portion protrudes towards the electrode assembly, the stop portion includes a bottom wall and a side wall, the bottom wall is disposed opposite to at least a part of the liquid injection hole, the side wall intersects and connects with the bottom wall, and the side wall has a communication port, and the communication port communicates the liquid injection hole with the accommodation cavity.

[0011] In the above solution, by providing the stop portion and setting the bottom wall of the stop portion to be opposite to at least a part of the liquid injection hole, during the process of injecting the electrolyte, the bottom wall of the stop portion can provide a certain limiting effect on the liquid injection needle, reducing the risk of the liquid injection needle damaging the electrode assembly.

[0012] According to some embodiments of the present application, the electrode assembly includes an electrode body and a tab, the tab is led out from the end of the electrode body facing the first wall, and the boss abuts against the electrode body.

[0013] In the above solution, by setting the boss to abut against the electrode body and providing the boss with a flow channel, while reducing the risk of the electrode assembly shaking and improving the structural stability of the electrode assembly, it is also beneficial to improve the utilization rate of the internal space of the battery cell by the electrolyte and improve the wettability of the electrolyte to the battery cell.

[0014] According to some embodiments of the present application, the dimension of the first wall in the first direction is greater than the dimension of the first wall in the second direction, and the first direction, the second direction, and the thickness direction are perpendicular to each other in pairs.

[0015] In the above solution, since the space on both sides of the boss in the first direction is larger, the process of the electrolyte flowing from one side to the other side of the boss in the first direction will be smoother, which is beneficial to improving the fluidity of the electrolyte in the accommodation cavity, improving the utilization rate of the internal space of the battery cell by the electrolyte, and improving the wettability of the electrolyte to the electrode assembly.

[0016] According to some embodiments of the present application, the flow channel extends in the first direction and penetrates through the boss.

[0017] In the above solution, since the flow channel extends in the first direction, there is no bend in the boss inside the flow channel, which is beneficial to improving the smoothness of the electrolyte flowing in the flow channel during the process of the electrolyte flowing from one side to the other side of the flow channel in the first direction.

[0018] According to some embodiments of the present application, the boss includes a plurality of flow channels, and the plurality of flow channels are arranged at intervals in the second direction, and the first direction, the second direction, and the thickness direction are perpendicular to each other in pairs.

[0019] In the above solution, a plurality of flow channels are arranged at intervals in the second direction, so that different flow channels will not affect each other. Arranging a plurality of flow channels is beneficial to increasing the amount of electrolyte flowing from one side of the boss in the first direction to the other side. During the injection of the electrolyte, it is beneficial to improve the smoothness of the electrolyte injection and is beneficial to improving the wettability of the electrolyte on the electrode assembly.

[0020] According to some embodiments of the present application, both sides of the boss in the second direction are respectively in contact with the outer shell, and the first direction, the second direction, and the thickness direction are perpendicular to each other in pairs.

[0021] In the above solution, it is beneficial to improve the structural stability of the insulating part, and at the same time, it is beneficial to improve the utilization rate of the internal space of the battery cell by the electrolyte and is beneficial to improving the wettability of the electrolyte on the electrode assembly.

[0022] According to some embodiments of the present application, the flow channel is in the shape of a groove, and one side of the flow channel facing the electrode assembly has an opening.

[0023] In the above solution, after the electrolyte flows into the flow channel, it can flow through the opening to the electrode assembly opposite to the boss, which is beneficial to further improving the wettability of the electrolyte on the electrode assembly and is beneficial to improving the connectivity of the internal space of the accommodating cavity. Further, it is beneficial to improve the fluidity of the electrolyte in the accommodating cavity, and the flow channel is in the shape of a groove, which is convenient for the processing and forming of the flow channel and is beneficial to simplifying the processing technology of the insulating part.

[0024] According to some embodiments of the present application, the battery cell further includes a pressure relief mechanism, and the pressure relief mechanism is arranged on the first wall and is arranged opposite to the boss. The boss has a hollow hole, the hollow hole communicates with the accommodating cavity and is arranged opposite to the pressure relief mechanism, and the flow channel is arranged at an interval from the hollow hole.

[0025] In the above solution, the hollow hole of the boss is arranged opposite to the pressure relief mechanism, which is convenient for the pressure relief mechanism to be opened in time. In this way, on the premise that the arrangement of the boss is beneficial to the timely opening of the pressure relief mechanism, the flow channel of the boss is beneficial to improving the fluidity of the electrolyte on both sides of the boss in the first direction, and further is beneficial to improving the wettability of the electrolyte on the electrode assembly.

[0026] According to some embodiments of the present application, the orthographic projection of the flow channel on the first wall is arranged in a dislocation manner with the pressure relief mechanism.

[0027] In the above solution, it is beneficial to reduce the influence of the flow channel on the normal pressure relief of the pressure relief mechanism and is beneficial to further improving the reliable performance of the battery cell.

[0028] In a second aspect, the battery device provided by the embodiments of the present application includes the battery cell provided by any one of the above embodiments.

[0029] The battery device provided by the embodiment of the present application has the same technical effects because it adopts the battery cell provided by any of the above embodiments, and thus will not be elaborated here.

[0030] In a third aspect, the power consumption device provided by the embodiment of the present application includes the battery cell or the battery device provided by any of the above embodiments, and the battery device is used to provide electric energy.

[0031] The power consumption device provided by the embodiment of the present application has the same technical effects because it adopts the battery device or the battery cell provided by the above embodiment, and thus will not be elaborated here.

[0032] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 It is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

[0035] Figure 2 It is a schematic structural diagram of a battery device provided by an embodiment of the present application;

[0036] Figure 3 It is a schematic structural diagram of a battery module in the battery device provided by an embodiment of the present application;

[0037] Figure 4 It is an exploded structural diagram of a battery cell provided by an embodiment of the present application;

[0038] Figure 5 It is a front view of a battery cell provided by an embodiment of the present application;

[0039] Figure 6 It is Figure 5 A sectional structural diagram along A-A;

[0040] Figure 7 It is Figure 6 A partial enlarged view at B in

[0041] Figure 8 It is a front view of a partial structure of a battery cell provided by an embodiment of the present application;

[0042] Figure 9Schematic cross-sectional structure diagram of some structures in the battery cell provided by the embodiment of the present application.

[0043] In the drawings, the drawings are not necessarily drawn to scale.

[0044] Description of reference numerals:

[0045] 1 - Vehicle;

[0046] 10 - Battery device; 111 - First sub - box body; 112 - Second sub - box body; 11 - Box body; 1a - Motor; 1b - Controller;

[0047] 20 - Battery module;

[0048] 30 - Battery cell; 31 - Outer shell; 31a - Accommodating cavity; 311 - Housing; 312 - End cap; 313 - First wall; 3131 - Liquid injection hole;

[0049] 32 - Electrode assembly; 321 - Electrode body; 322 - Tab;

[0050] 40 - Insulating part; 41 - Boss; 41a - Flow channel; 41b - Hollow hole; 42 - Stopping part; 421 - Bottom wall; 422 - Side wall; 422a - Communication port;

[0051] 50 - Pressure relief mechanism;

[0052] X - First direction; Y - Second direction; Z - Thickness direction. Detailed implementation manners

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0054] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used in the description of the present application in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the description and claims of the present application and the above - mentioned drawings are intended to cover non - exclusive inclusion. The terms "first", "second", etc. in the description and claims of the present application or the above - mentioned drawings are used to distinguish different objects and are not used to describe a specific order or primary - secondary relationship.

[0055] References to "embodiments" in this application mean that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0056] In the description of this application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0057] The term "and / or" in this application is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after. [[ID=??]]

[0058] The term "a plurality of" as used in this application refers to two or more (including two). Similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of sheets" refers to two or more sheets (including two sheets).

[0059] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0060] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with cable ties.

[0061] In some embodiments, the battery apparatus can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0062] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0063] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells to the box.

[0064] In some embodiments, the box can be part of the chassis structure of a vehicle. For example, a part of the box can become at least a part of the floor of the vehicle, or a part of the box can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0065] In some embodiments, the battery device can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0066] In the embodiments of the present application, the battery cell can be a secondary battery, and the secondary battery refers to a battery cell that can be activated by charging after the battery cell discharges and can be used continuously.

[0067] The battery cell can be, but is not limited to, a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0068] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and at the same time allow the active ions to pass through.

[0069] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0070] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0071] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0072] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material of the battery cell can also be used.

[0073] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0074] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, carbon electrodes, carbon, nickel, or titanium, etc. can be used.

[0075] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0076] As an example, the negative electrode active material can be a negative electrode active material for a battery cell well-known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material can be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as the negative electrode active material of the battery cell can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0077] In some embodiments, the separator is an insulating film. The present application has no particular limitation on the type of the insulating film, and any well-known porous insulating film with good chemical stability and mechanical stability can be selected.

[0078] As an example, the main material of the insulating film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The insulating film can be a single-layer film or a multi-layer composite film, without particular limitation. When the insulating film is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surfaces of the positive and negative electrodes.

[0079] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0080] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0081] In some embodiments, the electrode assembly has a laminated structure.

[0082] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0083] In some embodiments, the housing includes an end cap and a housing body. The housing body is provided with an opening, and the end cap closes the opening to form a sealed space for accommodating substances such as the electrode assembly and the electrolyte. The housing body can be provided with one or more openings. One or more end caps can also be provided.

[0084] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing body.

[0085] In some embodiments, a pressure relief valve is provided on the housing. The pressure relief valve is used to release the internal pressure of the battery cell.

[0086] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc. There is no particular limitation in the embodiments of the present application.

[0087] In the related art, the space inside the battery cell is not always connected, or the connectivity of the space inside the battery cell is not always good. Therefore, the fluidity of the electrolyte inside the battery cell is poor, resulting in the fact that the space inside the battery cell cannot be fully utilized, and a part of the electrode assembly cannot be fully wetted by the electrolyte. Thus, it is easy to cause waste of the space inside the battery cell and the problem of poor wettability of the electrode assembly of the battery cell, seriously affecting the reliable performance of the battery cell.

[0088] In view of this, the embodiments of the present application provide a battery cell. The battery cell includes a housing, an electrode assembly, and an insulating member. The housing includes a first wall. The electrode assembly is accommodated in the accommodation cavity of the housing. The insulating member is provided on one side of the first wall facing the electrode assembly. The insulating member has a convex platform protruding towards the electrode assembly. The convex platform has a flow channel, and the flow channel communicates with the accommodation cavities on both sides of the convex platform along a first direction. The first direction intersects with the thickness direction of the first wall.

[0089] The battery cell provided by the embodiment of the present application has a flow channel provided on the boss of the insulating member, and the flow channel is arranged to communicate with the accommodation cavities on both sides of the boss along the first direction, so as to improve the fluidity of the electrolyte inside the battery cell, which is beneficial to improving the utilization rate of the internal space of the battery cell by the electrolyte and is also beneficial to improving the wettability of the electrolyte to the electrode assembly.

[0090] The technical solutions described in the embodiments of the present application are applicable to battery cells, battery devices including battery cells, and electrical devices using battery devices.

[0091] The battery device disclosed in the embodiments of the present application can be but is not limited to being used in electrical devices such as vehicles, ships or aircraft. The power supply system of the electrical device can be composed of the battery device disclosed in the present application.

[0092] The embodiment of the present application provides an electrical device using a battery device as a power source. The electrical device can be but is not limited to mobile phones, tablet computers, laptop computers, electric toys, power tools, electric bicycles, electric motorcycles, electric vehicles, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys and electric aircraft toys, etc., and spacecraft can include airplanes, rockets, space shuttles and spaceships, etc.

[0093] For the convenience of description in the following embodiments, a vehicle is taken as an example of an electrical device in an embodiment of the present application for illustration.

[0094] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of vehicle 1 provided by the embodiment of the present application. Vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 10 is arranged inside vehicle 1, and the battery device 10 can be arranged at the bottom, head or tail of vehicle 1. The battery device 10 can be used for the power supply of vehicle 1, for example, the battery device 10 can be used as the operating power source of vehicle 1 and is used for the circuit system of vehicle 1, such as the working power consumption requirements for the start, navigation and operation of vehicle 1.

[0095] Vehicle 1 may further include a controller 1b and a motor 1a. The controller 1b is used to control the battery device 10 to supply power to the motor 1a, for example, for the working power consumption requirements for the start, navigation and driving of vehicle 1.

[0096] In some embodiments of the present application, the battery device 10 can not only be used as the operating power source of vehicle 1, but also be used as the driving power source of vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 1.

[0097] Please refer to Figure 2and Figure 3 , Figure 2 is a schematic structural diagram of the battery device 10 provided by an embodiment of the present application. Figure 3 is a schematic structural diagram of the battery module 20 in the battery device 10 provided by an embodiment of the present application. The battery device 10 includes a box body 11 and battery cells 30, and the battery cells 30 are accommodated in the box body 11. Among them, the box body 11 is used to provide an accommodation space for the battery cells 30, and the box body 11 can adopt various structures. In some embodiments, the box body 11 may include a first sub-box body 111 and a second sub-box body 112. The first sub-box body 111 and the second sub-box body 112 cover each other, and the first sub-box body 111 and the second sub-box body 112 jointly define an accommodation space for accommodating the battery cells 30. The second sub-box body 112 may be a hollow structure with one end open, and the first sub-box body 111 may be a plate-like structure. The first sub-box body 111 covers the open side of the second sub-box body 112 so that the first sub-box body 111 and the second sub-box body 112 jointly define an accommodation space; the first sub-box body 111 and the second sub-box body 112 may also both be hollow structures with one side open, and the open side of the first sub-box body 111 covers the open side of the second sub-box body 112.

[0098] In the battery device 10, there may be multiple battery cells 30, and the multiple battery cells 30 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 30. The multiple battery cells 30 can be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 30 is accommodated in the box body 11; of course, the battery device 10 can also be in the form that multiple battery cells 30 are first connected in series, in parallel, or in a mixed connection to form battery modules 20, and then the multiple battery modules 20 are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box body 11. The battery device 10 may further include other structures. For example, the battery device 10 may further include a busbar component for realizing the electrical connection among the multiple battery cells 30.

[0099] Among them, the battery cell 30 can be a secondary battery or a primary battery; the battery cell 30 can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0100] Please refer to Figure 4 , Figure 4 which is an exploded structural diagram of the battery cell 30 provided by an embodiment of the present application. As Figure 4 shown, the battery cell 30 includes a housing 31, an electrode assembly 32, and electrode terminals. The housing 31 includes a shell 311 and an end cap 312. The shell 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0101] The housing 311 is a component for cooperating with the end cap 312 to form the internal environment of the battery cell 30. Among them, the formed internal environment can be used to accommodate the electrode assembly 32, the electrolyte, and other components. The housing 311 and the end cap 312 can be independent components. The housing 311 can be of various shapes and sizes. Specifically, the shape of the housing 311 can be determined according to the specific shape and size of the electrode assembly 32. The material of the housing 311 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0102] The end cap 312 is a component that covers the opening of the housing 311 to isolate the internal environment of the battery cell 30 from the external environment. Without limitation, the shape of the end cap 312 can be adapted to the shape of the housing 311 to cooperate with the housing 311. Optionally, the end cap 312 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 312 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 30 to have higher structural strength and improved reliability. Functional components such as electrode terminals can be provided on the end cap 312. The electrode terminals can be used to electrically connect with the electrode assembly 32 for outputting or inputting the electrical energy of the battery cell 30. The material of the end cap 312 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating structure can also be provided on the inner side of the end cap 312, and the insulating structure can be used to isolate the electrical connection components in the housing 311 from the end cap 312 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0103] The electrode assembly 32 is a component in the battery cell 30 where an electrochemical reaction occurs. The housing 311 can contain one or more electrode assemblies 32. The electrode assembly 32 is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and usually an isolation film is provided between the positive electrode plate and the negative electrode plate. The isolation film is used to separate the positive electrode plate and the negative electrode plate to reduce the risk of internal short circuit between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive electrode body and a positive electrode tab. At least part of the positive electrode body is coated with an active material layer, and at least part of the positive electrode tab is not coated with an active material layer. The negative electrode plate includes a negative electrode body and a negative electrode tab. At least part of the negative electrode body is coated with an active material layer, and at least part of the negative electrode tab is not coated with an active material layer. The positive electrode body, the negative electrode body, and the separator form the electrode body 321 of the electrode assembly 32. The positive electrode tab and the negative electrode tab can be located at one end of the electrode body 321 together or at both ends of the electrode body 321 respectively. During the charging and discharging process of the battery cell 30, the positive active material and the negative active material react with the electrolyte, and the tabs 322 are connected to the electrode terminals to form a current loop.

[0104] In the first aspect, asFigure 4 , Figure 5 , Figure 6 and Figure 8 As shown in Figure 6 , Figure 8 , the battery cell 30 provided by the embodiment of the present application includes a housing 31, an electrode assembly 32, and an insulating member 40. The housing 31 includes a first wall 313. The electrode assembly 32 is accommodated in the accommodation cavity 31a of the housing 31. The insulating member 40 is disposed on the side of the first wall 313 facing the electrode assembly 32. The insulating member 40 has a boss 41 protruding toward the electrode assembly 32. The boss 41 has a flow channel 41a. The flow channel 41a communicates with the accommodation cavity 31a on both sides of the boss 41 along the first direction X. The first direction X intersects with the thickness direction Z of the first wall 313.

[0105] The housing 31 may include a housing body 311 and an end cap 312. Optionally, the first wall 313 may be a part of the housing body 311, or the first wall 313 may be a part of the end cap 312.

[0106] The electrode assembly 32 may include an electrode body 321 and a tab 322. The tab 322 is led out from the end of the electrode body 321. Optionally, the tab 322 may be led out from the end of the electrode body 321 facing the first wall 313, or the tab 322 may be led out from the end of the electrode body 321 facing away from the first wall 313. Of course, the tab 322 may be led out from the end of the electrode body 321 facing the wall where the housing 31 intersects with the first wall 313.

[0107] The insulating member 40 is disposed on the side of the first wall 313 facing the electrode assembly 32. The insulating member 40 may be used for insulating the first wall 313 from the electrode assembly 32. The insulating member 40 has a boss 41 protruding toward the electrode assembly 32. The boss 41 may be used to limit the electrode assembly 32, or the boss 41 may be used to protect related structural members on the first wall 313, etc.

[0108] Since the boss 41 has a flow channel 41a, optionally, the boss 41 has one or more flow channels 41a arranged at intervals. The flow channel 41a may extend only along the first direction X, or the flow channel 41a may be bent inside the boss 41.

[0109] The flow channel 41a communicates with the accommodation spaces on both sides of the boss 41 along the first direction X. Then, the electrolyte on either side of the boss 41 along the first direction X can also flow to the other side of the boss 41 along the first direction X through the flow channel 41a.

[0110] The first direction X intersects with the thickness direction Z of the first wall 313, so the first direction X intersects with the protruding direction of the boss 41. The boss 41 can be arranged in the middle of the first wall 313 along the first direction X, so that the sizes of the spaces on both sides of the boss 41 along the first direction X are equivalent. Of course, the boss 41 can also be arranged deviating from the middle of the first wall 313, and the specific position and use of the boss 41 can be set according to actual needs.

[0111] Optionally, the first direction X can be the direction with a larger dimension of the first wall 313, or the first direction X can be the direction with a smaller dimension of the first wall 313.

[0112] The boss 41 protrudes towards the electrode assembly 32, so the boss 41 is located in the accommodation cavity 31a. The presence of the boss 41 may cause a certain obstruction to the flow of the electrolyte inside the accommodation cavity 31a. By providing the boss 41 with a flow channel 41a and arranging the flow channel 41a to communicate with the accommodation cavities 31a on both sides of the boss 41 along the first direction X, the electrolyte located on either side of the boss 41 along the first direction X in the accommodation cavity 31a can flow to the other side of the boss 41 along the first direction X through the flow channel 41a, so that the electrolyte can make full use of the spaces of the accommodation cavities 31a on both sides of the boss 41 along the first direction X, and can fully wet each part of the electrode assembly 32 corresponding to both sides of the boss 41 along the first direction X, which is beneficial to improving the utilization rate of the electrolyte for the internal space of the battery cell 30, and is beneficial to improving the wettability of the electrolyte to the electrode assembly 32, and reducing the risk of lithium deposition on the electrode assembly 32.

[0113] For the battery cell 30 provided by the embodiment of the present application, by providing the boss 41 of the insulating member 40 with a flow channel 41a and arranging the flow channel 41a to communicate with the accommodation cavities 31a on both sides of the boss 41 along the first direction X, the fluidity of the electrolyte inside the battery cell 30 is improved, which is beneficial to improving the utilization rate of the electrolyte for the internal space of the battery cell 30, and is beneficial to improving the wettability of the electrolyte to the electrode assembly 32, reducing the risk of lithium deposition on the electrode assembly 32, and further improving the reliable performance of the battery cell 30.

[0114] In some embodiments, as Figure 4 、 Figure 5 、 Figure 6 and Figure 8 shown, the first wall 313 has a liquid injection hole 3131, and the liquid injection hole 3131 is arranged at the side of the orthographic projection of the boss 41 along the thickness direction Z on the first wall 313 along the first direction X. The liquid injection hole 3131 is communicated with the accommodation cavity 31a and is used for injecting electrolyte into the accommodation cavity 31a.

[0115] The liquid injection hole 3131 communicates with the accommodation cavity 31a. The liquid injection hole 3131 is provided on the side of the orthographic projection of the boss 41 along the thickness direction Z on the first wall 313 along the first direction X. During the process of injecting the electrolyte into the accommodation cavity 31a through the liquid injection hole 3131, the presence of the flow channel 41a on the boss 41 makes the connectivity of the parts of the accommodation cavity 31a on both sides of the boss 41 along the first direction X better, which is beneficial to improving the smoothness of the electrolyte injection.

[0116] During the process of injecting the electrolyte, the electrolyte can flow from one side of the boss 41 to the other side along the first direction X through the flow channel 41a, more electrolyte can be injected, and the electrolyte can wet more parts of the electrode assembly 32.

[0117] Therefore, such a setting is beneficial to improving the smoothness of the electrolyte injection, further beneficial to improving the utilization rate of the space of the accommodation cavity 31a by the electrolyte, improving the wettability of the electrolyte to the electrode assembly 32, and further reducing the risk of lithium deposition on the electrode assembly 32.

[0118] In some embodiments, as Figure 6 、 Figure 7 and Figure 8 shown, the insulating part 40 has a stop portion 42, the stop portion 42 protrudes towards the electrode assembly 32, the stop portion 42 includes a bottom wall 421 and a side wall 422, the bottom wall 421 is disposed opposite to at least a part of the liquid injection hole 3131, the side wall 422 intersects and connects with the bottom wall 421, and the side wall 422 has a communication port 422a, and the communication port 422a communicates the liquid injection hole 3131 with the accommodation cavity 31a.

[0119] The stop portion 42 includes a bottom wall 421 and a side wall 422 intersecting with the bottom wall 421. The side wall 422 has a communication port 422a, and the communication port 422a communicates with the accommodation cavity 31a so that the electrolyte can flow into the accommodation cavity 31a through the communication port 422a. The side wall 422 can have one or two communication ports 422a. The side wall 422 can be integrally formed, or the stop portion 42 includes a plurality of side walls 422. Exemplarily, the stop portion 42 includes two side walls 422, and the two side walls 422 are respectively connected to both sides of the bottom wall 421 along the first direction X.

[0120] During the process of injecting the electrolyte into the accommodation cavity 31a through the liquid injection hole 3131, it is necessary to use a liquid injection needle to insert into the liquid injection hole 3131. After the liquid injection needle is inserted into the liquid injection hole 3131, since the bottom wall 421 of the stop portion 42 is disposed opposite to at least a part of the liquid injection hole 3131, the bottom wall 421 of the stop portion 42 can provide a certain limiting effect on the liquid injection needle, reducing the risk of the liquid injection needle damaging the electrode assembly 32.

[0121] Therefore, by providing the stopper portion 42 and arranging the bottom wall 421 of the stopper portion 42 to face at least a part of the liquid injection hole 3131, during the process of injecting the electrolyte, the bottom wall 421 of the stopper portion 42 can provide a certain limiting effect on the liquid injection needle, reducing the risk of the liquid injection needle damaging the electrode assembly 32.

[0122] In some embodiments, as Figure 4 、 Figure 5 and Figure 6 shown, the electrode assembly 32 includes an electrode body 321 and a tab 322. The tab 322 is led out from the end of the electrode body 321 facing the first wall 313, and the boss 41 abuts against the electrode body 321.

[0123] Since the boss 41 abuts against the electrode body 321, the boss 41 can provide a certain limiting effect on the electrode body 321, reducing the risk of the electrode assembly 32 shaking within the housing 31.

[0124] Since the boss 41 abuts against the electrode assembly 32, the electrolyte on either side of the boss 41 along the first direction X can flow through the flow channel 41a of the boss 41 to the other side of the boss 41 along the first direction X, improving the utilization rate of the space of the accommodation cavity 31a by the electrolyte and improving the wettability of the electrolyte to the electrode assembly 32.

[0125] Therefore, arranging the boss 41 to abut against the electrode body 321 and providing the boss 41 with the flow channel 41a is conducive to improving the utilization rate of the internal space of the battery cell 30 by the electrolyte and improving the wettability of the electrolyte to the battery cell 30 while reducing the risk of the electrode assembly 32 shaking and improving the structural stability of the electrode assembly 32.

[0126] In some embodiments, the dimension of the first wall 313 along the first direction X is greater than the dimension of the first wall 313 along the second direction Y, and the first direction X, the second direction Y, and the thickness direction Z are perpendicular to each other in pairs.

[0127] Since the dimension of the first wall 313 along the first direction X is greater than the dimension of the first wall 313 along the second direction Y, the space on both sides of the boss 41 along the first direction is larger, which is conducive to improving the smoothness of electrolyte injection during the process of injecting the electrolyte into the accommodation cavity 31a through the first wall 313.

[0128] In addition, since the space on both sides of the boss 41 along the first direction X is larger, the process of the electrolyte flowing from either side of the boss 41 along the first direction X to the other side will be smoother, which is conducive to improving the fluidity of the electrolyte within the accommodation cavity 31a, improving the utilization rate of the internal space of the battery cell 30 by the electrolyte, and improving the wettability of the electrolyte to the electrode assembly 32.

[0129] In some embodiments, as Figure 8As shown, the flow channel 41a extends along the first direction X and penetrates through the boss 41.

[0130] Since the flow channel 41a extends along the first direction X, there is no bend inside the boss 41 for the flow channel 41a. During the process of the electrolyte flowing from one side to the other side of the flow channel 41a along the first direction X, it is beneficial to improve the smoothness of the electrolyte flowing in the flow channel 41a.

[0131] In some embodiments, the boss 41 includes a plurality of flow channels 41a, and the plurality of flow channels 41a are arranged at intervals along the second direction Y. The first direction X, the second direction Y, and the thickness direction Z are perpendicular to each other in pairs.

[0132] Since the plurality of flow channels 41a are arranged at intervals along the second direction Y, different flow channels 41a will not affect each other. By providing a plurality of flow channels 41a, it is beneficial to increase the amount of the electrolyte flowing from one side to the other side of the boss 41 along the first direction X. During the process of injecting the electrolyte, it is beneficial to improve the smoothness of the electrolyte injection and is beneficial to improve the wettability of the electrolyte to the electrode assembly 32.

[0133] In some embodiments, both sides of the boss 41 along the second direction Y are respectively abutted against the outer shell 31. The first direction X, the second direction Y, and the thickness direction Z are perpendicular to each other in pairs.

[0134] Both sides of the boss 41 along the second direction Y are respectively abutted against the outer shell 31, which is beneficial to improve the structural stability of the insulator and is beneficial to improve the insulation performance of the insulator 40 to the electrode assembly 32 and the first wall 313.

[0135] By providing the flow channel 41a on the boss 41, the electrolyte can flow from one side of the boss 41 to the other side through the flow channel 41a, which is further beneficial to improve the utilization rate of the internal space of the battery cell 30 by the electrolyte and is beneficial to improve the wettability of the electrolyte to the electrode assembly 32.

[0136] Therefore, with such a setting, it is beneficial to improve the utilization rate of the internal space of the battery cell 30 by the electrolyte and is beneficial to improve the wettability of the electrolyte to the electrode assembly 32 on the premise of improving the structural stability of the insulator 40.

[0137] In some embodiments, as Figure 8 and Figure 9 shown, the flow channel 41a is in a groove shape, and the side of the flow channel 41a facing the electrode assembly 32 has an opening.

[0138] The flow channel 41a is in the shape of a groove and has an opening facing the side of the electrode assembly 32. After the electrolyte flows into the flow channel 41a, it can flow through the opening to the electrode assembly 32 opposite to the boss 41, which is beneficial to further improve the wettability of the electrolyte to the electrode assembly 32, and is beneficial to improve the connectivity of the internal space of the accommodation cavity 31a, further beneficial to improve the fluidity of the electrolyte in the accommodation cavity 31a. Moreover, the flow channel 41a is in the shape of a groove, which is convenient for the processing and forming of the flow channel 41a and is beneficial to simplify the processing technology of the insulating part 40.

[0139] In some embodiments, as Figure 5 and Figure 6 shown, the battery cell 30 further includes a pressure relief mechanism 50, and the pressure relief mechanism 50 is arranged on the first wall 313 and is arranged opposite to the boss 41. The boss 41 has a hollow hole 41b, the hollow hole 41b communicates with the accommodation cavity 31a and is arranged opposite to the pressure relief mechanism 50, and the flow channel 41a is arranged at an interval from the hollow hole 41b.

[0140] The pressure relief mechanism 50 can be opened when the pressure inside the battery cell 30 reaches the pressure relief threshold of the battery cell 30, so as to relieve the pressure of the battery cell 30 in time when the battery cell 30 has a risk of thermal runaway and reduce the risk of explosion of the battery cell 30.

[0141] Optionally, the boss 41 can have one or more hollow holes 41b, and the hollow holes 41b can be arranged opposite to the pressure relief mechanism 50 along the thickness direction Z of the first wall 313, so that the gas inside the battery cell 30 exerts pressure on the pressure relief mechanism 50 through the hollow holes 41b. When the air pressure inside the battery cell 30 reaches the pressure relief threshold of the pressure relief mechanism 50, the pressure relief mechanism 50 can be opened in time and the gas inside the battery cell 30 can be discharged through the hollow holes 41b.

[0142] In this way, the setting of the boss 41 can make the air pressure inside the battery cell 30 act on the pressure relief mechanism 50 through the hollow holes 41b and make the pressure relief mechanism 50 open in time when the air pressure inside the battery cell 30 reaches its pressure relief threshold.

[0143] Therefore, setting the hollow hole 41b of the boss 41 opposite to the pressure relief mechanism 50 is convenient for the pressure relief mechanism 50 to open in time. In this way, on the premise that the setting of the boss 41 is beneficial to the timely opening of the pressure relief mechanism 50, the flow channel 41a of the boss 41 is beneficial to improve the fluidity of the electrolyte on both sides of the boss 41 along the first direction X, and further beneficial to improve the wettability of the electrolyte to the electrode assembly 32.

[0144] In some embodiments, as Figure 8 shown, the orthographic projection of the flow channel 41a on the first wall 313 is arranged offset from the pressure relief mechanism 50.

[0145] In this way, it is beneficial to reduce the influence of the flow channel 41a on the normal pressure relief of the pressure relief mechanism 50, and it is beneficial to further improve the reliable performance of the battery cell 30.

[0146] In a second aspect, the battery device 10 provided by the embodiment of the present application includes the battery cell 30 provided by any of the above embodiments.

[0147] Since the battery device 10 provided by the embodiment of the present application adopts the battery cell 30 provided by any of the above embodiments, it has the same technical effects, which will not be elaborated here.

[0148] In a third aspect, the electrical device provided by the embodiment of the present application includes the battery cell 30 or the battery device 10 provided by the above embodiments, and the battery device 10 is used to provide electrical energy.

[0149] Since the electrical device provided by the embodiment of the present application adopts the battery device 10 or the battery cell 30 provided by the above embodiments, it has the same technical effects, which will not be elaborated here.

[0150] In some embodiments, such as Figures 4 to 9As shown in the figure, the battery cell 30 includes a housing 31, an electrode assembly 32, an insulating member 40, and a pressure relief mechanism 50. The housing 31 includes a first wall 313, and the first wall 313 has a liquid injection hole 3131. The electrode assembly 32 is accommodated in the accommodation cavity 31a of the housing 31 and includes an electrode body 321 and a tab 322. The tab 322 is led out from the end of the electrode body 321 facing the first wall 313. The insulating member 40 is disposed on the side of the first wall 313 facing the electrode assembly 32. The insulating member 40 has a boss 41 and a stop portion 42 protruding towards the electrode assembly 32. The boss 41 abuts against the electrode body 321. The boss 41 includes a plurality of flow channels 41a, and the plurality of flow channels 41a are arranged at intervals along the second direction Y. The flow channels 41a are in the shape of grooves. The side of the flow channels 41a facing the electrode assembly 32 has an opening. The flow channels 41a communicate with the accommodation cavity 31a on both sides of the boss 41 along the first direction X. The flow channels 41a extend along the first direction X and penetrate through the boss 41. The dimension of the first wall 313 along the first direction X is greater than the dimension of the first wall 313 along the second direction Y. The first direction X, the second direction Y, and the thickness direction Z are perpendicular to each other in pairs. The liquid injection hole 3131 is disposed on the side of the projection of the boss 41 along the thickness direction Z on the first wall 313 along the first direction X. The liquid injection hole 3131 communicates with the accommodation cavity 31a and is used for injecting electrolyte into the accommodation cavity 31a. The stop portion 42 includes a bottom wall 421 and a side wall 422. The bottom wall 421 is disposed opposite to at least a part of the liquid injection hole 3131. The side wall 422 intersects and connects with the bottom wall 421. The side wall 422 has a communication port 422a, and the communication port 422a communicates the liquid injection hole 3131 with the accommodation cavity 31a. The pressure relief mechanism 50 is disposed on the first wall 313 and is disposed opposite to the boss 41. The boss 41 has a hollow hole 41b, and the hollow hole 41b communicates with the accommodation cavity 31a and is disposed opposite to the pressure relief mechanism 50. The flow channels 41a are spaced apart from the hollow hole 41b. The projection of the flow channels 41a on the first wall 313 is misaligned with the pressure relief mechanism 50.

[0151] For the battery cell 30 provided by the embodiment of the present application, by providing that the boss 41 of the insulating member 40 has flow channels 41a and setting the flow channels 41a to communicate with the accommodation cavity 31a on both sides of the boss 41 along the first direction X, the fluidity of the electrolyte inside the battery cell 30 is improved, which is beneficial to improving the utilization rate of the internal space of the battery cell 30 by the electrolyte, and is beneficial to improving the wettability of the electrolyte to the electrode assembly 32, reducing the risk of lithium plating on the electrode assembly 32, and further improving the reliable performance of the battery cell 30.

[0152] Although the present application has been described with reference to preferred embodiments, various modifications can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing including a first wall; An electrode assembly accommodated in a receiving cavity of the housing; An insulating member disposed on a side of the first wall facing the electrode assembly. The insulating member has a boss protruding towards the electrode assembly. The boss has a flow channel, and the flow channel communicates with the receiving cavities on both sides of the boss along a first direction. The first direction intersects with the thickness direction of the first wall.

2. The battery cell according to claim 1, wherein The first wall has a liquid injection hole, and the liquid injection hole is disposed at a side of a positive projection of the boss on the first wall along the first direction in the thickness direction. The liquid injection hole communicates with the receiving cavity and is used for injecting electrolyte into the receiving cavity.

3. The battery cell according to claim 2, characterized in that, The insulating member has a stop portion protruding towards the electrode assembly. The stop portion includes a bottom wall and a side wall. The bottom wall is disposed opposite to at least a part of the liquid injection hole. The side wall intersects and connects with the bottom wall. The side wall has a communication port, and the communication port communicates the liquid injection hole with the receiving cavity.

4. The battery cell according to claim 1, characterized in that, The electrode assembly includes an electrode body and a tab. The tab is led out from an end of the electrode body facing the first wall, and the boss abuts against the electrode body.

5. The battery cell according to claim 1, wherein The dimension of the first wall along the first direction is greater than the dimension of the first wall along a second direction. The first direction, the second direction, and the thickness direction are perpendicular to each other in pairs.

6. The battery cell according to claim 1, characterized in that, The flow channel extends along the first direction and penetrates through the boss.

7. The battery cell according to claim 1, characterized in that, The boss includes a plurality of flow channels, and the plurality of flow channels are arranged at intervals along the second direction. The first direction, the second direction, and the thickness direction are perpendicular to each other in pairs.

8. The battery cell according to claim 1, characterized in that, Both sides of the boss along the second direction respectively abut against the housing. The first direction, the second direction, and the thickness direction are perpendicular to each other in pairs.

9. The battery cell according to claim 1, wherein The flow channel is in a groove shape, and the side of the flow channel facing the electrode assembly has an opening.

10. The battery cell according to any one of claims 1 to 8, characterized in that, The battery cell further includes a pressure relief mechanism, and the pressure relief mechanism is disposed on the first wall and is disposed opposite to the boss; The boss has a hollow hole, and the hollow hole communicates with the receiving cavity and is disposed opposite to the pressure relief mechanism. The flow channel is spaced apart from the hollow hole.

11. The battery cell according to claim 10, wherein, The positive projection of the flow channel on the first wall is misaligned with the pressure relief mechanism.

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

13. An electrical device, characterized in that, Comprising the battery cell according to any one of claims 1 to 11 or the battery device according to claim 12, and the battery device is used for providing electric energy.

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