Battery cell, battery, electric device and energy storage device

Abstract

The present disclosure relates to the technical field of batteries. Disclosed are a battery cell, a battery, an electric device and an energy storage device. The battery cell comprises a housing, a cell core and a ventilation assembly. The housing is provided with an accommodating cavity, and comprises a first wall, and a first gas discharge channel is provided in the first wall. The cell core is arranged in the accommodating cavity. The ventilation assembly is mounted on the first wall and covers the first gas discharge channel, and the ventilation assembly comprises a connector and a ventilation film. At least one through hole is provided in the connector, and the ventilation film completely covers the through hole(s).

Description

Battery cell, battery, power-consuming device and energy storage device Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a battery cell, a battery, an electrical device, and an energy storage device. Background Art

[0002] New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in energy storage fields.

[0003] During the use of the battery cell, if the external air pressure, external temperature or the temperature of the battery cell changes, the air pressure inside the battery cell and the air pressure of the external environment will become unbalanced; and during the use of the battery cell, a certain amount of gas will also be slowly generated.

[0004] The above reasons may lead to lower reliability of battery cells and shorten the service life of battery cells.

[0005] Summary of the Invention

[0006] In view of this, the present disclosure provides a battery cell, a battery, an electrical device, and an energy storage device, which can improve the reliability of the battery cell and increase the life of the battery cell.

[0007] The present disclosure is achieved through the following technical solutions.

[0008] A first aspect of the present disclosure provides a battery cell comprising a housing, a battery cell, and a vent assembly. The housing comprises a housing cavity and a first wall, wherein a first exhaust passage is provided on the first wall. The battery cell is disposed within the housing cavity. The vent assembly is mounted to the first wall and covers the first exhaust passage. The vent assembly comprises a connector and a vent membrane, wherein the connector is provided with at least one through-hole, and the vent membrane covers all through-holes.

[0009] In the battery cell provided in the embodiment of the present disclosure, by providing a first exhaust channel on the first wall of the shell, installing the breathable component on the first wall and covering the first exhaust channel, the gas in the accommodating chamber can be connected to the external environment through the first exhaust channel, the connector and the breathable membrane, so that the first exhaust channel, the connector and the breathable membrane can form a channel for gas flow, keep the pressure in the accommodating chamber balanced with the pressure of the external environment, and reduce the risk of deformation of the shell (such as bulging deformation or concave deformation). In this way, the gas generated by the consumption of the electrolyte can also be discharged out of the battery cell in a timely manner; in addition, if an explosion-proof valve is provided on the shell, the risk of the explosion-proof valve opening prematurely can also be reduced. Therefore, through the above-mentioned arrangement, the battery cell provided in the embodiment of the present disclosure can improve the reliability of the battery cell and increase the life of the battery cell.

[0010] In a possible implementation of the present disclosure, the breathable component is disposed on a side of the first exhaust channel close to the accommodating cavity, and the breathable membrane is disposed on a side of the connector close to the accommodating cavity.

[0011] In a possible implementation of the present disclosure, a communication groove is provided on one side of the first wall close to the accommodating cavity, the communication groove is connected to the first exhaust channel and the accommodating cavity, and the air permeable component is installed in the communication groove.

[0012] In a possible implementation of the present disclosure, the connecting groove is a stepped groove arranged on the side of the first wall close to the accommodating cavity, the breathable component is installed in the stepped groove, and there is a flow gap between the breathable component and the surface of the first wall opposite to the breathable component, and the through hole is connected to the first exhaust channel through the flow gap.

[0013] In a possible implementation of the present disclosure, all the through holes are staggered with the first exhaust channel.

[0014] In a possible implementation of the present disclosure, the stepped groove includes a mounting groove and a first stepped groove, the first stepped groove is located on the side of the mounting groove away from the accommodating cavity, the radial dimension of the first stepped groove is smaller than the radial dimension of the mounting groove, the connecting piece is installed in the mounting groove, the breathable membrane is located on the side of the connecting piece close to the accommodating cavity, and the through hole and the first exhaust channel are connected through the space in the first stepped groove.

[0015] In a possible implementation of the present disclosure, the stepped groove includes a mounting groove and a second stepped groove, the second stepped groove is located on the side of the mounting groove close to the accommodating cavity, the radial dimension of the second stepped groove is larger than the radial dimension of the mounting groove, the connecting piece is installed in the mounting groove, and the breathable membrane is located in the space formed by the second stepped groove.

[0016] In a possible implementation of the present disclosure, the connecting member and the mounting groove are connected by welding, and the weld between the connecting member and the mounting groove is accommodated in the second stepped groove.

[0017] In a possible implementation of the present disclosure, there are multiple through holes, and the multiple through holes are evenly spaced and distributed on the connector.

[0018] In a possible implementation of the present disclosure, the battery cell also includes a protective sheet, which is installed on the side of the first wall away from the accommodating cavity and blocks the first exhaust channel; a connecting channel is formed on the side of the protective sheet facing the first wall, one end of the connecting channel is connected to the first exhaust channel, and the other end of the connecting channel is staggered with the first exhaust channel and connected to the external environment.

[0019] In a possible implementation of the present disclosure, a contour shape of the protection sheet matches a contour shape of the first wall.

[0020] In a possible implementation of the present disclosure, a surface of the protective sheet on a side close to the first wall is provided with an adhesive layer, the adhesive layer includes an escape area, and the escape area forms a connecting channel.

[0021] In a possible implementation of the present disclosure, a discharge hole is provided on the protection sheet, the discharge hole is staggered with the first exhaust channel, and the first exhaust channel is connected to the discharge hole through a connecting channel.

[0022] In a possible implementation of the present disclosure, the discharge hole is a sampling hole.

[0023] In a possible implementation of the present disclosure, the shell also includes a peripheral wall, and the circumferential edge of the first wall is connected to the peripheral wall; the battery cell also includes a shell insulating film located on the outer surface of the shell, and the shell insulating film includes a main body and a connecting flange, the main body covers the surface of the peripheral wall on the side away from the accommodating cavity, and the connecting flange is connected to the main body and covers the edge of the protective sheet on the side away from the accommodating cavity.

[0024] In a possible implementation of the present disclosure, the exhaust hole is provided in the middle of the protective sheet along the thickness direction of the battery cell, and the first exhaust channel is located on one side of the exhaust hole along the thickness direction of the battery cell.

[0025] In a possible implementation of the present disclosure, the battery cell also includes an insulating pad, which is arranged between the first wall and the battery cell, and a second exhaust channel is provided on the insulating pad. The breathable component is arranged between the first wall and the insulating pad, and the second exhaust channel is connected to the breathable component; the breathable membrane and the insulating pad are arranged at intervals.

[0026] In a possible implementation of the present disclosure, the first exhaust channel and the second exhaust channel are staggered.

[0027] In a possible implementation of the present disclosure, the through hole is arranged opposite to the second exhaust channel to communicate with the second exhaust channel.

[0028] In a possible implementation of the present disclosure, the through hole and the second exhaust channel are staggered, and the through hole and the second exhaust channel are communicated.

[0029] In a possible implementation of the present disclosure, the gas in the accommodating chamber is communicated with the external environment through the first exhaust channel, the connector, and the breathable membrane.

[0030] In a possible implementation of the present disclosure, an explosion-proof valve is further provided on the housing, and when the pressure of the gas in the accommodating chamber is greater than a preset threshold, the gas in the accommodating chamber is discharged through the explosion-proof valve.

[0031] A second aspect of the present disclosure provides a battery, comprising the battery cell provided in any one of the first aspects.

[0032] A third aspect of the present disclosure provides an electrical device, which includes the battery cell provided by any one of the first aspects or the battery provided by the second aspect.

[0033] A fourth aspect of the present disclosure provides an energy storage device, which includes the battery cell provided by any one of the first aspects or the battery provided by the second aspect.

[0034] Since the battery, electrical device or energy storage device provided by the embodiments of the present disclosure includes the battery cell provided by any one of the first aspects, it has the same technical effects, higher reliability and longer life. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present disclosure. The same reference numerals are used throughout the drawings to denote the same components. In the drawings:

[0036] FIG1 is a schematic structural diagram of a vehicle provided by some embodiments of the present disclosure;

[0037] FIG2 is a perspective exploded schematic diagram of a battery provided by some embodiments of the present disclosure;

[0038] FIG3 is a schematic diagram of the overall structure of a battery cell provided by some embodiments of the present disclosure;

[0039] FIG4 is an exploded schematic diagram of a battery cell provided by some embodiments of the present disclosure;

[0040] FIG5 is a schematic diagram of assembling a first wall and an insulating gasket of a battery cell according to some embodiments of the present disclosure;

[0041] FIG6 is an exploded schematic diagram of a first wall and an insulating pad of a battery cell provided by some embodiments of the present disclosure;

[0042] FIG7 is an enlarged schematic diagram of a first exhaust channel, a second exhaust channel, and a vent assembly of a battery cell provided in some embodiments of the present disclosure;

[0043] FIG8 is an enlarged schematic diagram of a first exhaust channel, a second exhaust channel, and a vent assembly of a battery cell provided by some embodiments of the present disclosure;

[0044] FIG9 is an enlarged schematic diagram of a first exhaust channel, a second exhaust channel, and a vent assembly of a battery cell provided by some embodiments of the present disclosure;

[0045] FIG10 is a schematic diagram of disposing a protective sheet of a battery cell according to some embodiments of the present disclosure;

[0046] FIG11 is a schematic diagram of disposing a protective sheet of a battery cell according to some embodiments of the present disclosure;

[0047] FIG12 is a schematic diagram of disposing a protective sheet of a battery cell according to some embodiments of the present disclosure;

[0048] FIG13 is a schematic diagram illustrating the arrangement of a protective sheet for a battery cell according to some embodiments of the present disclosure.

[0049] Explanation of reference numerals 01-vehicle; 011-battery; 0111-battery bottom plate; 0112-battery cover plate; 0113-battery vertical plate; 0114-battery cell; 012-controller; 013-motor; 1-housing; 11-accommodating chamber; 12-first wall; 121-first exhaust channel; 122-terminal mounting hole; 1221-terminal; 1222-terminal sealing ring; 123-liquid injection hole; 1231-sealing nail; 124-connecting groove; 1241-step groove; 12411-mounting groove; 12412-first step groove; 12413-second Step groove; 13-shell insulation membrane; 131-main body; 132-connecting flange; 14-explosion-proof valve installation hole; 15-peripheral wall; 2-battery cell; 21-battery cell insulation membrane; 3-ventilation component; 31-connector; 311-through hole; 312-weld; 32-ventilation membrane; 4-explosion-proof valve; 41-explosion-proof diaphragm; 5-insulating pad; 51-second exhaust channel; 6-protective sheet; 61-connecting channel; 62-sampling hole; 63-terminal avoidance hole; 64-liquid injection avoidance hole; 65-explosion-proof valve avoidance hole; 66-connection area; 67-avoidance area; 68-discharge hole. DETAILED DESCRIPTION

[0050] The following embodiments of the technical solution of the present disclosure are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present disclosure and are therefore only examples and are not intended to limit the scope of protection of the present disclosure.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present disclosure belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the terms "including" and "having" and any variations thereof in the specification and claims of the present disclosure and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0052] In the description of the embodiments of the present disclosure, technical terms such as "first," "second," and "third" are used solely to distinguish different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0053] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0054] In the description of the embodiments of the present disclosure, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0055] In the description of the embodiments of the present disclosure, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present disclosure.

[0056] In the description of the embodiments of the present disclosure, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure based on specific circumstances.

[0057] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0058] Hereinafter, the present disclosure will be described in detail.

[0059] Currently, new energy batteries are increasingly being used in everyday life and industry. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in a variety of fields such as aerospace. As the application of power batteries continues to expand, market demand is also growing.

[0060] In many application scenarios, multiple battery cells can be arranged and combined to form a battery pack for use, which can increase the capacity of the battery pack. Generally speaking, for the convenience of description, the battery in the embodiments of the present disclosure may generally refer to a battery pack or a battery module.

[0061] It should be noted that the batteries in the embodiments of the present disclosure can be used, but are not limited to, in power storage systems, vehicles, ships, aircraft, and other electrical devices. Furthermore, a battery pack or battery module is formed by placing multiple battery cells in a sealed enclosure, which provides more reliable dust and water resistance and can therefore be used in harsh, humid, or even submerged environments.

[0062] The embodiments of the present disclosure provide an electrical device including the above-mentioned battery or battery pack for providing electrical energy. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0063] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present disclosure is taken as an example of a vehicle 01. The following description is made with reference to the accompanying drawings.

[0064] FIG1 is a schematic structural diagram of a vehicle 01 provided in some embodiments of the present disclosure. The vehicle 01 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. As shown in FIG1 , a battery 011 is provided inside the vehicle 01. The battery 011 may be provided at the bottom, head or tail of the vehicle 01. The battery 011 may be used to power the vehicle 01. For example, the battery 011 may serve as an operating power source for the vehicle 01. The vehicle 01 may further include a controller 012 and a motor 013. The controller 012 is used to control the battery 011 to power the motor 013, for example, to meet the power requirements for starting, navigating and driving the vehicle 01.

[0065] In some embodiments of the present disclosure, the battery 011 can serve not only as an operating power source for the vehicle 01 , but also as a driving power source for the vehicle 01 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 01 .

[0066] Figure 2 is a schematic, exploded perspective view of a battery 011 provided in an embodiment of the present disclosure. As shown in Figure 2, battery 011 comprises a battery base plate 0111, a battery cover 0112, a battery stand 0113, and at least one battery cell 0114. The battery cover 0112 covers the battery base plate 0111, creating a space between the two for accommodating the battery cell 0114.

[0067] In battery 011, there may be multiple battery cells 0114, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel configurations within multiple battery cells 0114. Multiple battery cells 0114 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 0114 may be placed within the storage space formed by the battery base plate 0111 and the battery cover 0112. Alternatively, battery 011 may comprise multiple battery cells 0114 connected in series, in parallel, or in a hybrid configuration to form a battery module. The multiple battery modules are then connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the storage space formed by the battery base plate 0111 and the battery cover 0112. Battery 011 may also include other structures, such as a busbar assembly for electrically connecting multiple battery cells 10.

[0068] In the embodiment of the present disclosure, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0069] The battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present disclosure.

[0070] Although not shown, a 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 inserted and removed between the positive and negative electrodes. The separator is placed between the positive and negative electrodes to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0071] In some embodiments, the electrode assembly is provided with tabs (not shown) that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0072] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0073] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack 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 polygonal battery, such as a hexagonal battery, etc. There is no special limitation in the present disclosure.

[0074] As the battery cell's operating environment changes, such as under different external air pressures, or different external temperatures and changes in the battery cell's temperature, this can cause an imbalance between the air pressure inside the battery cell and the external air pressure. Alternatively, during the use of the battery cell, as the battery cell's electrolyte is gradually consumed, a certain amount of gas will be generated, causing the air pressure inside the battery cell to increase. All of these factors will pose a risk to the integrity of the battery cell's outer shell, resulting in reduced reliability and shortening the battery cell's service life. For example, for battery cells equipped with explosion-proof valves, these factors may cause the explosion-proof valve to open prematurely, shortening the battery cell's service life.

[0075] In view of this, embodiments of the present disclosure provide a battery cell, a battery, an electrical device, and an energy storage device.

[0076] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present disclosure is taken as an example of a vehicle 01. The following description is made with reference to the accompanying drawings.

[0077] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to FIG. 3 to FIG. 13 .

[0078] Specifically, referring to Figures 3 to 9 , the battery cell provided in the embodiments of the present disclosure includes a housing 1, a battery cell 2, and a vent assembly 3. The housing 1 has a housing cavity 11 and includes a first wall 12, on which a first exhaust passage 121 is provided. The battery cell 2 is disposed in the housing cavity 11. The vent assembly 3 is mounted on the first wall 12 and covers the first exhaust passage 121. The vent assembly 3 includes a connector 31 and a vent membrane 32. The connector 31 has at least one through-hole 311, and the vent membrane 32 covers all through-holes 311.

[0079] It should be noted that, in order to vividly describe the battery cells in the embodiments of the present disclosure, square battery cells are used as an example in the specification and drawings. It is understandable that other types of battery cells can also be understood by referring to square battery cells.

[0080] In the disclosed embodiment, the material of the main structure of the housing 1 is not limited. For example, the housing 1 can be set as a steel shell, and alternatively, the housing 1 can be set as an aluminum shell. In addition, the material of all parts of the housing 1 can be set to be the same, or the material of all parts of the housing 1 can be set to be different. For example, part of the structure of the housing 1 can be set as a steel shell or an aluminum shell, and the other part of the structure of the housing 1 can be set as plastic, etc.

[0081] 3 and 4 , in order to protect the battery cell 2 , a battery cell insulation film 21 may be provided on the outer surface of the battery cell 2 ; and in order to protect the battery cell, a shell insulation film 13 may be provided on the surface of the housing 1 .

[0082] It is understood that in the embodiment of the present disclosure, the housing 1 is used to form a accommodating cavity 11, and the accommodating cavity 11 is used to place the battery cell 2. For the housing 1, a plurality of different walls may be included. For example, with reference to Figure 3, for a square battery cell, the housing 1 of the battery cell includes six side walls relatively located at the top, bottom, left, right, front and back of the battery cell. In the embodiment of the present disclosure, the first exhaust channel 121 may be provided on any of the six side walls mentioned above. For this purpose, one of the six side walls on which the first exhaust channel 121 is provided may be considered to be the first wall 12.

[0083] In addition, in the embodiment of the present disclosure, the type of the first exhaust channel 121 is not limited. For example, referring to Figures 7 to 9, the first exhaust channel 121 can be configured as a straight hole extending in a straight line and penetrating both sides of the first wall 12. In this way, the straight hole can be used as a discharge channel for the gas in the accommodating chamber 11. In addition, the first exhaust channel 121 can also be configured as a curved channel or various types of channels in the form of stepped grooves. In this way, the first exhaust channel 121 can also be formed using the above channels.

[0084] It is understood that in the embodiment of the present disclosure, the cross-section of the first exhaust channel 121 can be set to a circular shape. In addition, the cross-section of the first exhaust channel 121 can also be set to other shapes, for example, the cross-section of the first exhaust channel 121 can be set to a square shape.

[0085] Furthermore, in the embodiments of the present disclosure, the specific structural form of the breathable membrane 32 is not limited. For example, the breathable membrane 32 can be configured as a polymer porous structure. By adjusting the pore size of the porous structure, the breathable membrane 32 can be configured to allow gaseous substances to pass through while isolating liquid substances. In this way, the breathable membrane 32 can be used to reduce the risk of electrolyte leakage within the battery cell. At the same time, it can also reduce the risk of external liquids (such as water) entering the battery cell and affecting the reliability of the battery cell 2. Specifically, in some embodiments of the present disclosure, the breathable membrane 32 can be configured as a breathable membrane 32 made of polytetrafluoroethylene.

[0086] It is understandable that in the embodiment of the present disclosure, the connector 31 can be used as a mounting carrier for the breathable membrane 32 , the breathable membrane 32 can be fixedly connected to the connector 31 , and then the connector 31 can be mounted to the first wall 12 .

[0087] It should be noted that, in the disclosed embodiment, there is no limitation on the specific structural form of the connector 31. For example, referring to Figures 6 to 9, the connector 31 can be configured as a thin plate structure, and the through hole 311 is formed by providing straight holes on both sides of the thin plate structure.

[0088] In addition, it should be noted that, in the embodiment of the present disclosure, the number of the above-mentioned through holes 311 can be set to one, or the number of the above-mentioned through holes 311 can be set to two or more, and the embodiment of the present disclosure is not limited to this.

[0089] For example, referring to Figures 6 to 9, in some embodiments of the present disclosure, the shape of the connecting member 31 can be set to be circular, the through hole 311 can be set to be multiple, and the above-mentioned multiple through holes 311 can be set to be evenly spaced in the middle position of the connecting member 31.

[0090] Furthermore, by adaptively setting the sizes of the connecting member 31 and the breathable membrane 32 , the breathable membrane 32 can cover all the through holes 311 .

[0091] It should be noted that, in the embodiment of the present disclosure, the breathable component 3 can be installed on the first wall 12 corresponding to the first exhaust channel 121. Specifically, the position of the breathable component 3 can be adaptively adjusted according to the position of the first exhaust channel 121, so that the breathable component 3 covers the first exhaust channel 121. Furthermore, in the embodiment of the present disclosure, the breathable component 3 can be installed on the side of the first wall 12 away from the accommodating cavity 11, so that the breathable component 3 covers the opening of the first exhaust channel 121 on the side away from the accommodating cavity 11; in addition, in the embodiment of the present disclosure, the breathable component 3 can also be installed on the side of the first wall 12 close to the accommodating cavity 11, so that the breathable component 3 covers the opening of the first exhaust channel 121 on the side close to the accommodating cavity 11.

[0092] Furthermore, in the disclosed embodiments, the relative positions of the connector 31 and the breathable membrane 32 are not limited. For example, referring to Figures 7 to 9 , the breathable membrane 32 can be positioned on the side of the connector 31 that is closer to the accommodating cavity 11. Alternatively, the breathable membrane 32 can be positioned on the side of the connector 31 that is further away from the accommodating cavity 11.

[0093] Through the above-mentioned arrangement, in the battery cell provided in the embodiment of the present disclosure, by providing a first exhaust channel 121 on the first wall 12 of the housing 1, and installing the vent assembly 3 on the first wall 12 and covering the first exhaust channel 121, the gas in the accommodating chamber 11 can be connected to the external environment through the first exhaust channel 121, the connector 31, and the vent membrane 32. Thus, the first exhaust channel 121, the connector 31, and the vent membrane 32 can form a channel for gas flow, maintaining the pressure in the accommodating chamber 11 in balance with the pressure in the external environment, and reducing the risk of deformation of the housing 1 (such as bulging or concave deformation). In this way, the gas generated by the consumption of the electrolyte can also be discharged from the battery cell in a timely manner; in addition, the explosion-proof valve 4 provided on the housing 1 can also reduce the risk of the explosion-proof valve 4 opening prematurely. Therefore, through the above-mentioned arrangement, the battery cell provided in the embodiment of the present disclosure can improve the reliability of the battery cell and increase the life of the battery cell.

[0094] On this basis, in the battery cell provided by the embodiment of the present disclosure, the gas in the accommodating cavity 11 is communicated with the external environment through the first exhaust channel 121 , the connector 31 , and the breathable membrane 32 .

[0095] It can be understood that the external environment here refers to the environment outside the battery cell. Here, the gas in the accommodating chamber 11 is connected to the external environment, which means that the gas in the accommodating chamber 11 is connected to the external environment in real time. When the gas pressure in the accommodating chamber 11 is greater than the gas pressure of the external environment (for example, the gas pressure in the accommodating chamber 11 increases due to the temperature rise in the battery cell, or the gas pressure in the accommodating chamber 11 increases due to the gradual consumption of the electrolyte), the gas in the accommodating chamber 11 can flow to the external environment through the first exhaust channel 121, the connector 31 and the breathable membrane 32, thereby balancing the gas pressure in the accommodating chamber 11 with the gas pressure in the external environment; when the gas pressure in the accommodating chamber 11 is less than the gas pressure in the external environment, the gas in the external environment can also flow into the accommodating chamber 11 through the first exhaust channel 121, the connector 31 and the breathable membrane 32, thereby balancing the gas pressure in the accommodating chamber 11 with the gas pressure in the external environment.

[0096] It should be noted that in other embodiments of the present disclosure, other structures may be provided between the first wall 12 of the battery cell and the accommodating cavity 11, or other structures may be provided on the side of the first wall 12 away from the accommodating cavity 11. In this way, a channel may be provided on the other structure to ultimately connect the accommodating cavity 11 to the external environment.

[0097] In this way, the gas in the accommodating chamber 11 can communicate with the external environment through the first exhaust channel 121, the connecting member 31, the breathable membrane 32 and other channels.

[0098] Through the above-mentioned arrangement, in the battery cell provided in the embodiment of the present disclosure, the gas in the accommodating cavity 11 is connected to the external environment through the first exhaust channel 121, the connector 31 and the breathable membrane 32. In this way, all media flowing through the through hole 311 can further pass through the breathable membrane 32, so that the breathable membrane 32 can be used to filter the above-mentioned media, thereby further protecting the battery cell 2.

[0099] In addition, referring to FIG. 6 , in some embodiments of the present disclosure, an explosion-proof valve 4 is further provided on the housing 1 . When the pressure of the gas in the accommodating chamber 11 is greater than a preset threshold, the gas in the accommodating chamber 11 is discharged through the explosion-proof valve 4 .

[0100] It is understandable that, in order to facilitate the installation of the explosion-proof valve 4 and to connect the explosion-proof valve 4 with the accommodating chamber 11 , referring to FIG. 6 , an explosion-proof valve installation hole 14 may be provided on the housing 1 corresponding to the explosion-proof valve 4 .

[0101] In addition, in some embodiments of the present disclosure, the explosion-proof valve 4 can be made into a thin-sheet explosion-proof valve 4. In addition, the explosion-proof valve 4 can also be set as a pin-type explosion-proof valve 4, and a thinned area can be directly processed on the first wall 12 to serve as the explosion-proof valve 4.

[0102] For example, referring to FIG6 , a thin-film explosion-proof valve 4 includes an explosion-proof diaphragm 41 . The explosion-proof diaphragm 41 has a breaking pressure. When the pressure of the gas in the accommodating chamber 11 exceeds the breaking pressure, the gas in the accommodating chamber 11 will cause the explosion-proof diaphragm 41 to break, thereby causing the gas in the accommodating chamber 11 to be discharged through the explosion-proof valve 4 . For ease of description, the pressure value corresponding to the breaking pressure that causes the explosion-proof valve 4 to break may be referred to as a preset threshold. Depending on the type or model of the selected explosion-proof valve 4 , the corresponding preset threshold may vary.

[0103] It should be noted that, in the embodiments of the present disclosure, the above-mentioned preset threshold is not limited. For example, in some embodiments of the present disclosure, the preset threshold can be set to 0.9±0.2 MPa.

[0104] It is understandable that in the embodiment of the present disclosure, the explosion-proof valve 4 is used to quickly discharge the gas or liquid in the accommodating cavity 11 in the event of an abnormality in the battery cell (such as extreme conditions such as thermal runaway or collision), thereby ensuring the safety of the battery cell.

[0105] In addition, it should be noted that the explosion-proof valve 4 and the above-mentioned first exhaust channel 121 and the breathable component 3 can be set on the same side wall of the shell 1. For example, with reference to Figures 4 to 6, in some embodiments of the present disclosure, the explosion-proof valve 4, the first exhaust channel 121 and the breathable component 3 can all be set on the upper side wall of the shell 1. In addition, the explosion-proof valve 4, the first exhaust channel 121 and the breathable component 3 can also be set on different side walls of the shell 11. For example, the explosion-proof valve 4 can be set on the upper side wall of the shell 1, and the first exhaust channel 121 and the breathable component 3 can be set on the left or right side wall of the shell 1.

[0106] Furthermore, in the disclosed embodiment, the explosion-proof valve 4, first exhaust passage 121, and vent assembly 3 are independent of each other. As the electrolyte is gradually consumed, gas is generated within the accommodating chamber 11. This gradually generated gas can be discharged through the first exhaust passage 121 and vent assembly 3, ensuring that the pressure within the accommodating chamber 11 does not exceed the valve-opening pressure of the explosion-proof valve 4, thus preventing the explosion-proof valve 4 from being damaged. However, in the event of a battery cell anomaly, the pressure within the accommodating chamber 11 rises rapidly, and the first exhaust passage 121 and vent assembly 3 are unable to meet the gas discharge requirements within the accommodating chamber 11. If the gas pressure within the accommodating chamber 11 exceeds a preset threshold, the explosion-proof valve 4 is damaged, and the gas within the accommodating chamber 11 can be rapidly discharged through the explosion-proof valve 4.

[0107] It is understandable that when the explosion-proof valve 4 is damaged, the discharge rate of the gas in the accommodating chamber 11 by the explosion-proof valve 4 is greater than the discharge rate of the gas in the accommodating chamber 11 by the first exhaust channel 121 and the breathable component 3.

[0108] Through the above arrangement, in the battery cell provided in the embodiment of the present disclosure, when the pressure in the accommodating cavity 11 increases rapidly, the explosion-proof valve 4 can be used to quickly discharge the gas in the accommodating cavity 11, thereby further improving the reliability of the battery cell.

[0109] It should be noted that, according to the above description, the breathable membrane 32 can be arranged on the side of the connector 31 close to the accommodating cavity 11 , or on the side of the connector 31 away from the accommodating cavity 11 .

[0110] On this basis, in order to use the connecting member 31 to protect the breathable membrane 32, referring to Figures 7 to 9, in some embodiments of the present disclosure, the breathable component 3 is arranged on the side of the first exhaust channel 121 close to the accommodating cavity 11, and the breathable membrane 32 is arranged on the side of the connecting member 31 close to the accommodating cavity 11.

[0111] It should be noted that in the embodiment of the present disclosure, the breathable component 3 can be adaptively fixed to the side of the first wall 12 close to the accommodating cavity 11 corresponding to the first exhaust channel 121, so that the breathable component 3 covers the opening of the first exhaust channel 121 close to the accommodating cavity 11. On this basis, the breathable membrane 32 can be positioned on the side of the connector 31 close to the accommodating cavity 11 by adaptively setting the relative positions of the connector 31 and the breathable membrane 32.

[0112] In this way, the gas in the accommodating chamber 11 is discharged to the external environment through the breathable membrane 32 , the connecting member 31 and the first exhaust channel 121 in sequence according to the exhaust path of the gas in the accommodating chamber 11 .

[0113] This arrangement allows the breathable membrane 32 to be placed as close to the accommodating cavity 11 as possible, further reducing electrolyte loss within the battery cell and increasing the battery cell's service life. Furthermore, this arrangement allows the first wall 12 and connector 31 to protect the breathable membrane 32, reducing the risk of damage to the membrane 32. This further improves the reliability and lifespan of the battery cell.

[0114] In addition, referring to Figure 7, in some embodiments of the present disclosure, a connecting groove 124 is provided on one side of the first wall 12 close to the accommodating cavity 11. The connecting groove 124 is connected to the first exhaust channel 121 and the accommodating cavity 11, and the breathable component 3 is installed in the connecting groove 124.

[0115] 7 , a groove-shaped structure may be provided on one side of the first wall 12 close to the accommodating cavity 11 to form a communication groove 124. Furthermore, the communication groove 124 may be utilized to install the ventilating assembly 3.

[0116] In addition, the communication groove 124 may be provided corresponding to the first exhaust passage 121 so that the communication groove 124 is connected to the first exhaust passage 121 .

[0117] 7 , the relative positions in FIG7 are used as an example for explanation. The first exhaust channel 121 can be disposed on the bottom wall of the communication groove 124 away from the accommodating chamber 11 , so that the first exhaust channel 121 and the communication groove 124 can be connected.

[0118] In addition, the opening of the communicating groove 124 facing the accommodating cavity 11 may be arranged to face the accommodating cavity 11 , so that the communicating groove 124 and the accommodating cavity 11 are in communication.

[0119] In addition, when other structures are provided between the first wall 12 and the accommodating chamber 11 , a channel may also be provided on the other structure to connect the communicating groove 124 and the accommodating chamber 11 .

[0120] It should be noted that in the embodiment of the present disclosure, on the basis of installing the breathable component 3 to the connecting groove 124, the breathable membrane 32 can be set on the side of the connecting member 31 close to the accommodating cavity 11; in addition, the breathable membrane 32 can also be set on the side of the connecting member 31 away from the accommodating cavity 11.

[0121] Through the above arrangement, in the battery cell provided in the embodiment of the present disclosure, by providing the communicating groove 124 on the side of the first wall 12 close to the accommodating cavity 11 , the installation of the vent assembly 3 can be facilitated.

[0122] On this basis, in some embodiments of the present disclosure, the connecting groove 124 is a stepped groove 1241 arranged on the side of the first wall 12 close to the accommodating cavity 11, the breathable component 3 is installed in the stepped groove 1241, and there is a flow gap between the breathable component 3 and the surface of the first wall 12 opposite to the breathable component 3, and the through hole 311 is connected to the first exhaust channel 121 through the flow gap.

[0123] It should be noted that the connecting groove 124 here is a stepped groove 1241, which can be considered to be formed by at least two stepped groove structures. In this way, the stepped structure of the stepped groove 1241 can be used to limit the installation of the breathable component 3, so as to facilitate the positioning of the breathable component 3.

[0124] Furthermore, the surface of the first wall 12 opposite the breathable component 3 can also be considered as the portion of the surface of the breathable component 3 on the side close to the accommodating cavity 11 located within the communication groove 124. On this basis, by adjusting the position of the breathable component 3 within the communication groove 124, a flow gap can be created between the breathable component 3 and the surface of the first wall 12 opposite the breathable component 3.

[0125] For example, referring to Figure 7 , the position of the vent assembly 3 within the communication groove 124 can be adjusted to create a gap between the vent assembly 3 and the bottom wall of the communication groove 124, which is away from the accommodating chamber 11. This gap can then be utilized to form the aforementioned flow gap. In this way, the through hole 311 can be connected to the first exhaust passage 121 using the aforementioned flow gap.

[0126] Through the above arrangement, in the battery cell provided by the embodiment of the present disclosure, by providing the communication groove 124 as a stepped groove 1241 on the side of the first wall 12 close to the accommodating cavity 11, and installing the vent assembly 3 in the stepped groove 1241, the vent assembly 3 can be conveniently installed in the stepped groove 1241, and the stepped groove 1241 can be used to position the vent assembly 3. At the same time, by providing a flow gap between the vent assembly 3 and the surface of the first wall 12 opposite to the vent assembly 3, the flow gap can be used to ensure communication between the through hole 311 and the first exhaust channel 121.

[0127] On this basis, referring to FIG. 7 , in some embodiments of the present disclosure, all the through holes 311 and the first exhaust channels 121 are staggered.

[0128] It should be noted that, referring to Figure 7, all the through holes 311 here are staggered with the first exhaust channel 121, which means that there is no overlapping part between the projection of all the through holes 311 along the axial direction of the through holes 311 toward the first wall 12 and the opening of the first exhaust channel 121 close to the side of the accommodating cavity 11.

[0129] For example, referring to FIG. 7 , in some embodiments of the present disclosure, the through hole 311 may be disposed in the middle of the connector 31 , and the first exhaust passage 121 may be disposed at a position opposite to an edge of the connector 31 .

[0130] Through the above-mentioned arrangement, in the battery cell provided in the embodiment of the present disclosure, all the through holes 311 and the first exhaust channel 121 are staggered, and the connector 31 can be used to form a bypass flow between the first exhaust channel 121 and the through hole 311, thereby reducing the risk of debris outside the battery cell directly entering the accommodating cavity 11 through the first exhaust channel 121, and thus protecting the battery cell 2. At the same time, it can also reduce the risk of debris entering the first exhaust channel 121 directly contacting the breathable membrane 32, thereby protecting the breathable membrane 32. For example, if the first wall 12 is set as the upper side wall of the battery cell, the risk of debris outside the battery cell directly falling into the accommodating cavity 11 through the first exhaust channel 121 can be reduced.

[0131] In addition, referring to Figures 7 to 9, in the battery cells provided in some embodiments of the present disclosure, the stepped groove 1241 includes a mounting groove 12411 and a first stepped groove 12412, the first stepped groove 12412 is located on the side of the mounting groove 12411 away from the accommodating cavity 11, the radial dimension of the first stepped groove 12412 is smaller than the radial dimension of the mounting groove 12411, the connector 31 is installed in the mounting groove 12411, the breathable membrane 32 is located on the side of the connector 31 close to the accommodating cavity 11, and the through hole 311 and the first exhaust channel 121 are connected through the space in the first stepped groove 12412.

[0132] 7 , in some embodiments of the present disclosure, the stepped groove 1241 may be configured to include a mounting groove 12411 and a first stepped groove 12412. Furthermore, by adaptively configuring the positions and sizes of the mounting groove 12411 and the second stepped groove 12413, the first stepped groove 12412 may be located on a side of the mounting groove 12411 away from the accommodating cavity 11, and the radial dimension of the first stepped groove 12412 may be smaller than the radial dimension of the mounting groove 12411.

[0133] It should be noted that the radial dimension of the first step groove 12412 here refers to the dimension of the first step groove 12412 along the direction perpendicular to the axial direction of the first step groove 12412; the radial dimension of the mounting groove 12411 refers to the dimension of the mounting groove 12411 along the direction perpendicular to the axial direction of the mounting groove 12411.

[0134] 7 , the relative positions in FIG7 are used as an example for explanation. The radial dimension of the first stepped groove 12412 refers to the dimension of the first stepped groove 12412 along the horizontal direction, and the radial dimension of the mounting groove 12411 refers to the dimension of the mounting groove 12411 along the horizontal direction.

[0135] It can be understood that in the embodiment of the present disclosure, the axis of the first stepped groove 12412 and the axis of the mounting groove 12411 can be set to coincide.

[0136] In this way, the connector 31 can be installed in the installation groove 12411 , and the space in the first stepped groove 12412 can be used to form a flow gap between the first exhaust channel 121 and the connector 31 , so that the through hole 311 and the first exhaust channel 121 are connected.

[0137] It should be noted that in the embodiment of the present disclosure, the through hole 311 and the first exhaust channel 121 can be arranged opposite each other. In this way, the through hole 311 and the first exhaust channel 121 can be connected by utilizing the above-mentioned flow gap. In addition, the through hole 311 and the first exhaust channel 121 can be staggered. In this way, the through hole 311 and the first exhaust channel 121 can also be connected by utilizing the above-mentioned flow gap.

[0138] Through the above arrangement, in the battery cell provided in the embodiment of the present disclosure, the space within the first stepped groove 12412 can be used to form a flow gap between the through hole 311 and the first exhaust channel 121, thereby facilitating the arrangement of the flow gap. Furthermore, the space within the first stepped groove 12412 can be used to arrange the through hole 311 and the first exhaust channel 121 in different ways. For example, the through hole 311 and the first exhaust channel 121 can be arranged relative to each other or staggered, thereby increasing the flexibility of the arrangement of the first exhaust channel 121 or the through hole 311.

[0139] In addition, referring to Figures 7 to 9, in some embodiments of the present disclosure, the stepped groove 1241 includes a mounting groove 12411 and a second stepped groove 12413, the second stepped groove 12413 is located on the side of the mounting groove 12411 close to the accommodating cavity 11, the radial dimension of the second stepped groove 12413 is larger than the radial dimension of the mounting groove 12411, the connecting member 31 is installed in the mounting groove 12411, and the breathable membrane 32 is located in the space formed by the second stepped groove 12413.

[0140] 7 , in some embodiments of the present disclosure, the stepped groove 1241 may be configured to include a mounting groove 12411 and a second stepped groove 12413. Furthermore, by adaptively configuring the positions and dimensions of the mounting groove 12411 and the first stepped groove 12412, the second stepped groove 12413 may be located on a side of the mounting groove 12411 that is closer to the accommodating cavity 11, and the radial dimension of the second stepped groove 12413 may be greater than the radial dimension of the mounting groove 12411.

[0141] It should be noted that the radial dimension of the second step groove 12413 here refers to the dimension of the second step groove 12413 along the direction perpendicular to the axial direction of the second step groove 12413; the radial dimension of the installation groove 12411 refers to the dimension of the first step groove 12412 along the direction perpendicular to the axial direction of the installation groove 12411.

[0142] 7 , the relative positions in FIG7 are used as an example for explanation. The radial dimension of the second stepped groove 12413 refers to the dimension of the second stepped groove 12413 along the horizontal direction, and the radial dimension of the mounting groove 12411 refers to the dimension of the mounting groove 12411 along the horizontal direction.

[0143] It can be understood that in the embodiment of the present disclosure, the axis of the second stepped groove 12413 and the axis of the mounting groove 12411 can be set to coincide.

[0144] In this way, the connector 31 can be installed in the installation groove 12411, and the space in the second stepped groove 12413 can be used to accommodate the breathable membrane 32. At the same time, the surface of the breathable membrane 32 close to the accommodating cavity 11 does not exceed the second stepped groove 12413 through adaptation.

[0145] Through the above arrangement, in the battery cell provided in the embodiment of the present disclosure, by setting the stepped groove 1241 to include the installation groove 12411 and the second stepped groove 12413, the space formed by the second stepped groove 12413 can be used to accommodate the breathable membrane 32, which can facilitate the installation of the breathable membrane 32.

[0146] In addition, referring to Figures 7 to 9, in some embodiments of the present disclosure, the connector 31 and the mounting groove 12411 are connected by welding, and the weld 312 between the connector 31 and the mounting groove 12411 is accommodated in the space formed by the second stepped groove 12413.

[0147] For example, in some embodiments of the present disclosure, the first wall 12 can be made of metal, and the connector 31 can be made of a metal structure, so that the connector 31 and the first wall 12 can be connected by welding. In addition, the first wall 12 can be made of plastic, and the connector 31 can also be made of plastic, so that the connector 31 and the first wall 12 can be connected by ultrasonic welding.

[0148] For example, referring to FIG9 , when providing the mounting groove 12411 and the second stepped groove 12413 on the first wall 12, the lower surface of the mounting groove 12411 can be flush with the lower surface of the connector 31, and the connector 31 can be connected by welding at the position where the edge of the lower surface of the connector 31 connects to the mounting groove 12411. In this way, the depth of the second stepped groove 12413 can be adjusted to accommodate the weld 312 between the connector 31 and the first wall 12.

[0149] Through the above-mentioned arrangement, the space formed by the second stepped groove 12413 can be utilized to accommodate the weld 312 between the connector 31 and the mounting groove 12411, thereby protecting the weld 312 between the connector 31 and the mounting groove 12411 and reducing the risk of squeezing the above-mentioned weld 312 when installing the breathable component 3, thereby ensuring the effectiveness of the connection between the connector 31 and the mounting groove 12411 and further improving the reliability of the battery cell provided in the embodiment of the present disclosure.

[0150] In addition, referring to FIG. 7 to FIG. 9 , in some embodiments of the present disclosure, there are multiple through holes 311 , and the multiple through holes 311 are evenly spaced and distributed on the connector 31 .

[0151] It should be noted that in the embodiment of the present disclosure, the cross-sectional shape of the through hole 311 is not limited. For example, the cross-sectional shape of the through hole 311 can be set to a circle, or the cross-sectional shape of the through hole 311 can be set to various shapes such as a square or a teardrop shape.

[0152] In addition, in the embodiment of the present disclosure, the multiple through holes 311 are evenly spaced on the connector 31. The multiple through holes 311 can be arranged in an array of rows and columns, or in a circular array.

[0153] Regarding arranging the plurality of through holes 311 in a circumferential array distribution, another through hole 311 may be further provided on the connecting member 31 at the center of the circle corresponding to the circumferential array distribution of the plurality of through holes 311 .

[0154] Through the above arrangement, in the battery cell provided by the embodiment of the present disclosure, while ensuring a constant flow area of ​​the flow channel formed by the through holes 311, the through holes 311 are dispersedly provided in a plurality, thereby ensuring the strength of the connector 31. Furthermore, the dispersed provision of the through holes 311 in a plurality also ensures that the connector 31 provides good support for the breathable membrane 32.

[0155] In addition, referring to Figure 8, in some embodiments of the present disclosure, the battery cell also includes a protective sheet 6, which is installed on the side of the first wall 12 away from the accommodating cavity 11 and blocks the first exhaust channel 121; a connecting channel 61 is formed on the side of the protective sheet 6 facing the first wall 12, one end of the connecting channel 61 is connected to the first exhaust channel 121, and the other end of the connecting channel 61 is staggered with the first exhaust channel 121 and connected to the external environment.

[0156] It should be noted that in some embodiments of the present disclosure, in order to protect the first exhaust channel 121, a protective sheet 6 can be provided for the first exhaust channel 121 to reduce the risk of debris outside the battery cell falling into the first exhaust channel 121 and affecting the performance of the ventilating component.

[0157] To this end, in the embodiment of the present disclosure, the protective sheet 6 can be attached to the side of the first wall 12 facing away from the accommodating cavity 11, corresponding to the first exhaust channel 121, to block the first exhaust channel 121. At the same time, a groove can be provided on the side of the protective sheet 6 facing the first wall 12, or a gap can be provided between the protective sheet 6 and the first wall 12 to form the aforementioned connecting channel 61.

[0158] Exemplarily, referring to Figure 8, taking the relative positions in Figure 8 as an example, the first exhaust channel 121 extends in the vertical direction, and the connecting channel 61 extends in the horizontal direction. The above-mentioned first exhaust channel 121 is connected to one end of the connecting channel 61, and the other end of the connecting channel 61 is connected to the external environment, so that the first exhaust channel 121 can be connected to the external environment.

[0159] In addition, it should be noted that the protective sheet 6 can be considered as a protective structure installed at the opening of the first wall 12 of the above-mentioned first exhaust channel 121. The protective sheet 6 can be set using a thin sheet structure. For example, tin foil can be used as the protective sheet 6, or the protective sheet 6 can be set to a material such as polypropylene, polyethylene or polycarbonate. The embodiments of the present disclosure are not limited to this.

[0160] In addition, in the embodiment of the present disclosure, the size of the protective sheet 6 is not limited. For example, the protective sheet 6 can be set only corresponding to the first exhaust channel 121, so that the size of the protective sheet 6 is slightly larger than the size of the opening of the first exhaust channel 121 on the side of the first wall 12 away from the accommodating cavity 11; the protective sheet 6 can also be set corresponding to the entire first wall 12, so that the protective sheet 6 covers the surface of the entire first wall 12 on the side away from the accommodating cavity 11.

[0161] It should be noted that in the disclosed embodiment, the connecting channel 61 can be extended to the edge of the protective sheet 6, thereby connecting the first exhaust channel 121 to the edge of the protective sheet 6, and ultimately connecting the first exhaust channel 121 to the external environment. Alternatively, a hole can be provided in the middle of the protective sheet 6 to connect the first exhaust channel 121 to the hole provided in the middle of the protective sheet 6, and ultimately connecting the first exhaust channel 121 to the external environment.

[0162] Through the above arrangement, in the battery cell provided in the embodiment of the present disclosure, the protective sheet 6 can be used to protect the first exhaust channel 121, thereby reducing the risk of foreign matter outside the battery cell entering the first exhaust channel 121. Furthermore, by providing a connecting channel 61 between the first wall 12 and the protective sheet 6, communication between the first exhaust channel 121 and the external environment is ensured.

[0163] On this basis, referring to FIG. 3 and FIG. 4 , the contour shape of the protection sheet 6 matches the contour shape of the first wall 12 .

[0164] It should be noted that here, the matching of the contour shape of the protective sheet 6 with the contour shape of the first wall 12 can be considered to mean that the size of the protective sheet 6 is the same or approximately the same as the size of the first wall 12, and the protective sheet 6 can cover the surface of the first wall 12 away from the side of the accommodating cavity 11.

[0165] It is understood that in the embodiment of the present disclosure, the protective sheet 6 can be arranged to extend along the surface of the first wall 12 on the side away from the accommodating cavity 11, and the contour shape of the protective sheet 6 matches the contour shape of the first wall 12. In this way, the protective sheet 6 can form the top patch of the battery cell, or the top patch can be used to form the protective sheet 6 of the battery cell. In this way, when the top patch of the battery cell is used to form the protective sheet 6, there is no need to provide a separate protective sheet 6.

[0166] Thus, in the embodiment of the present disclosure, the protective sheet 6 can be used to provide insulation to prevent the first wall 12 from short-circuiting with external circuits. At the same time, the protective sheet 6 can also protect the first wall 12 to prevent it from being scratched.

[0167] It is understandable that a sampling hole 62 , a terminal avoidance hole 63 , a liquid injection avoidance hole 64 , an explosion-proof valve avoidance hole 65 and the like may be provided on the protection sheet 6 .

[0168] Through the above arrangement, in some embodiments of the present disclosure, the top patch of the battery cell can be used to form the protective sheet 6, and there is no need to set up the protective sheet 6 separately, thereby enabling the battery cell provided by the embodiments of the present disclosure to save materials and reduce costs.

[0169] On this basis, referring to FIG3 , FIG4 , and FIG10 to FIG13 , a surface of the protective sheet 6 close to the first wall 12 is provided with an adhesive layer, the adhesive layer includes an escape area 67 , and the escape area 67 forms the above-mentioned connecting channel 61 .

[0170] It should be noted that, in the embodiment of the present disclosure, the protection sheet 6 can be connected to the top cover by providing a connecting glue on the surface of the side of the protection sheet 6 close to the top cover. For this, the connecting glue forms an adhesive layer on the side of the protection sheet 6 close to the first wall 12.

[0171] Furthermore, a portion of the protective sheet 6 may be reserved for the first exhaust channel 121 without the connection adhesive. Thus, the portion of the protective sheet 6 without the connection adhesive forms an escape area 67. Since the connection adhesive provided on the protective sheet 6 has a certain thickness, the escape area 67 is equivalent to forming a groove. By adaptively not providing the connection adhesive from the position on the protective sheet 6 corresponding to the first exhaust channel 121 to the position communicating with the external environment, the groove can be used to form the communication channel 61 at the position where the first exhaust channel 121 communicates with the external environment (such as the edge of the protective sheet 6 or the position of the sampling hole 62 provided on the protective sheet 6).

[0172] In addition, a connection adhesive may be first provided on the protection sheet 6 to form an adhesive layer, and then the adhesive layer at the position corresponding to the avoidance area may be removed to form the avoidance area 67 .

[0173] For example, in order to connect the first exhaust channel 121 to the hole provided in the protective sheet 6 through the connecting channel 61, an area without connecting glue can be reserved between the position of the protective sheet 6 corresponding to the first exhaust channel 121 and the position of the hole (e.g., the sampling hole 62) to form an escape area 67, so that the connecting channel 61 can be formed using the escape area 67. It should be noted that, referring to Figures 10 to 13, connecting glue can be provided in other areas outside the escape area 67 to form a connecting area 66 to connect the protective sheet 6 to the first wall 12.

[0174] It should be noted that, referring to Figures 10 to 13, in the embodiment of the present disclosure, the shape of the avoidance area 67 is not limited, as long as the avoidance area 67 can be used to form a connecting channel 61 to connect the first exhaust channel 121 with the above-mentioned hole.

[0175] For example, referring to FIG10 , in some embodiments of the present disclosure, the sampling hole 62 can be configured as a rectangle, and the avoidance area 67 can also be configured as a rectangle, with the long side of the rectangle corresponding to the avoidance area 67 being arranged to coincide with the side of the sampling hole 62. Furthermore, referring to FIG11 , in some embodiments of the present disclosure, the avoidance area 67 can also be configured to include a semicircular area corresponding to the first exhaust channel 121 and a rectangular area connected to the sampling hole 62, such that the rectangular area is connected to the sampling hole 62 along the shortest distance from the sampling hole 62. Furthermore, referring to FIG12 , in some embodiments of the present disclosure, the avoidance area 67 can also be configured to include a semicircular area corresponding to the first exhaust channel 121 and a triangular area connected to the sampling hole 62, such that the base of the triangular area coincides with the side of the sampling hole 62. Referring to FIG13 , in some embodiments of the present disclosure, the avoidance area 67 can also be configured as a trapezoid, with the long side of the avoidance area 67 corresponding to the side of the sampling hole 62 being arranged to coincide with the side of the sampling hole 62.

[0176] Of course, in addition to the above-mentioned configuration, the avoidance area 67 may also be configured into other shapes, which is not limited in the embodiment of the present disclosure.

[0177] Through the above arrangement, the avoidance area on the protection sheet 6 can be used to form the above-mentioned communication channel 61, which can simplify the structure of the communication channel 61 and eliminate the need for a separate arrangement.

[0178] In addition, in some embodiments of the present disclosure, a discharge hole 68 is provided on the protection sheet 6 , and the discharge hole 68 is staggered with the first exhaust channel 121 . The first exhaust channel 121 is connected to the discharge hole 68 through the connecting channel 61 .

[0179] It should be noted that in the embodiment of the present disclosure, the specific structural type of the discharge hole 68 is not limited. The discharge hole 68 is a hole structure arranged on the protective sheet 6. Any one of the sampling hole 62, the terminal avoidance hole 63, the liquid injection avoidance hole 64 or the explosion-proof valve avoidance hole 65 on the protective sheet 6 can be used as the discharge hole 68, or an additional hole can be separately set as the discharge hole 68.

[0180] In addition, in the embodiment of the present disclosure, the staggered arrangement of the exhaust hole 68 and the first exhaust channel 121 means that the exhaust hole 68 and the first exhaust channel 121 are not opposite each other. For example, it can be considered that the projection of the first exhaust channel 121 along the axial direction of the first exhaust channel 121 toward the exhaust hole 68 has no overlapping area with the exhaust hole 68.

[0181] On this basis, the first exhaust channel 121 can be connected to the exhaust hole 68 through the above-mentioned connecting channel 61, so that the exhaust hole 68 can be used as an exhaust channel of the first exhaust channel 121 to connect the accommodating chamber 11 to the external environment.

[0182] Through the above-mentioned arrangement, in the battery cell provided in the embodiment of the present disclosure, by providing the exhaust hole 68 on the protective sheet 6, the exhaust hole 68 can be used to connect the first exhaust channel 121 to the external environment. When the edge of the first wall 12 is blocked, it can be ensured that the first exhaust channel 121 is connected to the external environment.

[0183] On this basis, in some embodiments of the present disclosure, the discharge hole 68 is the sampling hole 62 .

[0184] It should be noted that in the embodiment of the present disclosure, the sampling hole 62 can be used to set up the temperature sampling structure of the battery cell. In addition, the sampling hole 62 can also be used as a QR code scanning hole for the battery cell. The embodiment of the present disclosure does not limit the function of the sampling hole 62.

[0185] Through the above arrangement, in the battery cell provided in the embodiment of the present disclosure, the sampling hole 62 can be used as the exhaust channel of the first exhaust channel 121, so that there is no need to set an exhaust channel for the first exhaust channel 121, thereby making the structure of the protective sheet 6 in the embodiment of the present disclosure simple and convenient to manufacture.

[0186] On this basis, with reference to Figures 3 and 8, in some embodiments of the present disclosure, the housing 1 further includes a peripheral wall 15, to which the peripheral edge of the first wall 12 is connected. The battery cell further includes a housing insulating film 13 located on the outer surface of the housing 1. The housing insulating film 13 includes a main body 131 and a connecting flange 132. The main body 131 covers the surface of the peripheral wall 15 on the side away from the accommodating cavity 11, and the connecting flange 132 is connected to the main body 131 and covers the edge of the protective sheet 6 on the side away from the accommodating cavity 11.

[0187] For example, the peripheral wall 15 described above can be considered to be the side wall of the battery cell connected to the circumferential edge of the first wall 12. Referring to Figures 3 and 8, taking the relative positions in Figures 3 and 8 as an example, the first wall 12 can be considered to be the upper wall of the battery cell housing 1, and the peripheral wall 15 can be considered to be the front, back, left, and right side walls of the housing 1.

[0188] It should be noted that in the disclosed embodiment, the housing insulating film 13 is located on the outer surface of the housing 1. The housing insulating film 13 can effectively isolate the battery cells from the external environment and also protect the battery cells. The housing insulating film 13 can be made of materials such as polypropylene, polyimide, and polyamide.

[0189] To ensure the connection between the housing insulating film 13 and the housing 1, referring to Figures 4 and 8, the housing insulating film 13 includes a main body 131 and a connecting flange 132. The main body 131 covers the surface of the peripheral wall 15 away from the accommodating cavity 11. The surface of the peripheral wall 15 away from the accommodating cavity 11 can also be considered the outer surface of the peripheral wall 15. The connecting flange 132 is equivalent to the flange structure of the main body 131 and covers the edge of the protective sheet 6 away from the accommodating cavity 11.

[0190] Through the above arrangement, the connecting flange 132 can be used to connect and insulate the first wall 12 and the peripheral wall 15. Furthermore, in the aforementioned embodiment, by connecting the connecting channel 61 to the exhaust hole 68 rather than the edge of the protective sheet 6, the first exhaust channel 121 can be connected to the external environment.

[0191] 3 and 4 , the exhaust hole 68 is provided in the middle of the protective sheet 6 along the thickness direction of the battery cell, and the first exhaust channel 121 is located on one side of the exhaust hole 68 along the thickness direction of the battery cell.

[0192] In some embodiments of the present disclosure, the exhaust hole 68 is positioned in the middle of the protective sheet 6 along the thickness of the battery cell. This facilitates the placement of the exhaust hole 68 and prevents it from being covered by the connecting flange 132, ensuring proper function of the exhaust hole 68. Furthermore, in the embodiments of the present disclosure, the first exhaust channel 121 is positioned to one side of the exhaust hole 68 along the thickness of the battery cell.

[0193] It should be noted that, in the embodiment of the present disclosure, the first exhaust channel 121 may be disposed above or below the exhaust hole 68 along the thickness direction of the battery cell relative to the exhaust hole 68 , and the embodiment of the present disclosure is not limited thereto.

[0194] Through the above-mentioned arrangement, in the battery cell provided in the embodiment of the present disclosure, it is possible to ensure that the first exhaust channel 121 is adaptively located on one side of the exhaust hole 68 along the thickness direction of the battery cell while the original design of the exhaust hole 68 remains unchanged. This facilitates the arrangement of the first exhaust channel 121 and ensures that the shape of the protective sheet 6 remains unchanged, thereby eliminating the need to arrange the protective sheet 6 for the first exhaust channel 121 and saving the manufacturing cost of the battery cell in the embodiment of the present disclosure.

[0195] In addition, referring to Figures 5 to 9, in some embodiments of the present disclosure, the battery cell further includes an insulating pad 5, which is arranged between the first wall 12 and the battery cell 2, and a second exhaust channel 51 is provided on the insulating pad 5. The breathable component 3 is arranged between the first wall 12 and the insulating pad 5, and the second exhaust channel 51 is connected to the breathable component 3, and the breathable membrane 32 and the insulating pad 5 are arranged at intervals.

[0196] It should be noted that in the embodiment of the present disclosure, the insulating pad 5 can play an insulating role between the first wall 12 and the battery cell 2. At the same time, the insulating pad 5 can also be used to form a sealing effect on the accommodating cavity 11 to seal the battery cell 2 in the accommodating cavity 11. For example, the insulating pad 5 can be made of plastic material, or the insulating pad 5 can be made of other insulating materials. On this basis, for setting the first wall 12 as the upper side wall of the battery cell, the first wall 12 can also be called a top cover, and the insulating pad 5 can be called a plastic pad.

[0197] For example, referring to Figure 6 , a terminal mounting hole 122 and a liquid injection hole 123 may also be provided on the first wall 12 and the insulating gasket 5 . Referring to Figure 4 , in the battery cell, a sealing pin 1231 is further installed on the liquid injection hole 123 , and a terminal 1221 and a terminal sealing ring 1222 are further installed on the terminal mounting hole 122 .

[0198] Furthermore, another exhaust channel is provided on the insulating pad 5. For the convenience of description, the exhaust channel may be referred to as the second exhaust channel 51. For example, referring to Figures 6 to 9, in the embodiment of the present disclosure, a straight hole penetrating both sides of the insulating pad 5 may be provided on the insulating pad 5 to form the second exhaust channel 51. It is understood that in the embodiment of the present disclosure, the cross-section of the second exhaust channel 51 may be set to a circular shape. In addition, the cross-section of the second exhaust channel 51 may also be set to other shapes, for example, the cross-section of the second exhaust channel 51 may be set to a square shape, etc.

[0199] 7 to 9 , in the embodiment of the present disclosure, by adaptively setting the relative positions of the first exhaust channel 121 , the second exhaust channel 51 and the breathable component 3 , the first exhaust channel 121 and the second exhaust channel 51 can be communicated with each other via the breathable component 3 .

[0200] In addition, referring to Figures 7 to 9 , in some embodiments of the present disclosure, the vent assembly 3 can be sandwiched between the first wall 12 and the insulating pad 5. Specifically, a connecting groove 124 can be provided on the first wall 12 or the insulating pad 5 to accommodate the vent assembly 3. Furthermore, the ends of the connecting groove 124 can be connected to the first exhaust channel 121 or the second exhaust channel 51, respectively, to allow the first exhaust channel 121 and the second exhaust channel 51 to communicate through the vent assembly 3.

[0201] Furthermore, referring to Figures 7 to 9 , in the disclosed embodiment, the breathable membrane 32 and the insulating pad 5 are spaced apart. It should be noted that the spaced-apart arrangement of the breathable membrane 32 and the insulating pad 5 here refers to a gap between the breathable membrane and the insulating pad 5, which prevents the breathable membrane 32 from contacting the insulating pad 5, thereby protecting the breathable membrane 32 and reducing the risk of damage to the breathable membrane 32 by the insulating pad 5.

[0202] It should be noted that the aforementioned avoidance gap can be formed by adapting the insulating pad 5 or the first wall 12. For example, referring to FIG. 7 , a stepped groove 1241 can be provided on the first wall 12, and the stepped groove 1241 includes the aforementioned mounting groove 12411 and the second stepped groove 12413. The connector 31 is installed in the mounting groove 12411, and the breathable membrane 32 is located in the space formed by the second stepped groove 12413.

[0203] Thus, the lower surface of the connector 31 and the lower surface of the mounting groove 12411 can be set to be flush, and the depth of the second stepped groove 12413 can be set to be greater than the thickness of the breathable membrane 32, so that a gap can be formed between the breathable membrane 32 and the insulating pad 5, thereby allowing the breathable membrane 32 and the insulating pad 5 to be spaced apart.

[0204] The above arrangement facilitates the installation of the breathable membrane 32 , and by arranging the breathable membrane 32 and the insulating spacer, the breathable membrane 32 is prevented from contacting the insulating pad 5 , thereby protecting the breathable membrane 32 and reducing the risk of damage to the breathable membrane 32 by the insulating pad 5 .

[0205] On this basis, in some embodiments of the present disclosure, the first exhaust channel 121 and the second exhaust channel 51 are staggered.

[0206] Here, the staggered arrangement of the first exhaust channel 121 and the second exhaust channel 51 means that the first exhaust channel 121 and the second exhaust channel 51 are not opposite each other along the direction from the insulating pad 5 to the first wall 12. For example, referring to FIG. 7 , and taking the relative positions in FIG. 7 as an example for illustration, the first exhaust channel 121 can be arranged on the left side of the first wall 12, and the second exhaust channel 51 can be arranged on the right side of the insulating pad 5, and along the direction from the insulating pad 5 to the first wall 12, the projection of the second exhaust channel 51 toward the first exhaust channel 121 does not overlap with the first exhaust channel 121.

[0207] 7 , a connecting groove 124 may be provided on one side of the first wall 12 close to the insulating pad 5 , and by adapting the shape of the connecting groove 124 , both ends of the connecting groove 124 may be connected to the first exhaust channel 121 and the second exhaust channel 51 , respectively.

[0208] In this way, by staggering the first exhaust channel 121 and the second exhaust channel 51, the risk of debris outside the battery cell entering the accommodating cavity 11 through the first exhaust channel 121 and the second exhaust channel 51 can be reduced, thereby protecting the battery cell 2. For example, if the first wall 12 is set as the upper side wall of the battery cell, the risk of debris outside the battery cell falling into the accommodating cavity 11 through the first exhaust channel 121 and the second exhaust channel 51 can be reduced.

[0209] Further, referring to FIG. 8 , in some embodiments of the present disclosure, the through hole 311 is disposed opposite to the second exhaust channel 51 to communicate with the second exhaust channel 51 .

[0210] Here, the through hole 311 and the second exhaust channel 51 are arranged opposite each other, which means that the through hole 311 and the second exhaust channel 51 are directly opposite each other, so that the through hole 311 and the second exhaust channel 51 can extend the flow channel between the through hole 311 and the second exhaust channel 51 in a straight line. For example, referring to FIG. 7 , the projections of the through hole 311 and the second exhaust channel 51 along the direction from the first wall 12 to the insulating pad 5 can be arranged to overlap or intersect, so that the through hole 311 and the second exhaust channel 51 can be directly connected.

[0211] Through the above arrangement, the through hole 311 and the second exhaust channel 51 are arranged opposite to each other, which can ensure the flow capacity between the through hole 311 and the second exhaust channel 51, so as to facilitate the discharge of the gas in the accommodating cavity 11.

[0212] In addition, referring to FIG. 9 , in some embodiments of the present disclosure, the through hole 311 and the second exhaust channel 51 are staggered, and the through hole 311 and the second exhaust channel 51 are in communication.

[0213] It should be noted that the staggered arrangement of the through holes 311 and the second exhaust channel 51 here means that there is no overlapping part between the projections of all the through holes 311 along the axial direction of the through holes 311 toward the second exhaust channel 51 and the openings of the second exhaust channel 51 away from the accommodating cavity 11.

[0214] On this basis, a communication gap may be provided between the first wall 12 and the insulating pad 5 to achieve communication between the through hole 311 and the second exhaust channel 51 .

[0215] For example, referring to FIG. 9 , the space within the second stepped groove 12413 may be used to form a flow gap to connect the through hole 311 and the second exhaust channel 51 .

[0216] Through the above arrangement, the risk of debris outside the battery cell entering the accommodating cavity 11 through the first exhaust channel 121, the through hole 311 and the second exhaust channel 51 can be further reduced, the risk of causing damage to the battery cell 2 can be reduced, and the reliability of the battery cell can be further improved.

[0217] Furthermore, the present disclosure also provides a battery, which includes the battery cell provided in the above embodiment. It should be noted that in the present disclosure, the battery generally refers to a battery pack or a battery module.

[0218] Furthermore, an embodiment of the present disclosure also provides an electrical device or an energy storage device, which includes the battery cell or battery provided in the above embodiment.

[0219] Since the battery, electrical device or energy storage device provided by the embodiments of the present disclosure includes the battery cells provided by the aforementioned embodiments, it has the same technical effects and can improve the reliability of the battery cells and increase the life of the battery cells.

[0220] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present disclosure, and they should all be included in the scope of the claims and description of the present disclosure. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present disclosure is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims. Industrial Applicability

[0221] In the battery cell provided in the disclosed embodiment, by providing a first exhaust channel on the first wall of the shell, installing the breathable component on the first wall and covering the first exhaust channel, the gas in the accommodating cavity can be connected to the external environment through the first exhaust channel, the connector and the breathable membrane, so that the first exhaust channel, the connector and the breathable membrane can form a channel for gas flow, keep the pressure in the accommodating cavity balanced with the pressure of the external environment, and reduce the risk of deformation of the shell (such as bulging deformation or concave deformation). In this way, the gas generated by the consumption of the electrolyte can also be discharged out of the battery cell in time; in addition, for the explosion-proof valve provided on the shell, the risk of the explosion-proof valve opening prematurely can also be reduced. Therefore, through the above-mentioned arrangement, the battery cell provided in the disclosed embodiment can improve the reliability of the battery cell and increase the life of the battery cell.

Claims

1. A battery cell, include: A housing having a receiving cavity, wherein the housing comprises a first wall, and a first exhaust passage is provided on the first wall; A battery cell, disposed in the accommodation cavity; A breathable component is installed on the first wall and covers the first exhaust channel. The breathable component includes a connector and a breathable membrane. The connector is provided with at least one through hole, and the breathable membrane covers all the through holes.

2. The battery cell according to claim 1, in, The air permeable component is arranged on a side of the first exhaust channel close to the accommodating cavity, and the air permeable membrane is arranged on a side of the connecting member close to the accommodating cavity.

3. The battery cell according to claim 1 or 2, in, A communication groove is provided on one side of the first wall close to the accommodating cavity. The communication groove is connected to the first exhaust passage and the accommodating cavity. The air permeable component is installed in the communication groove.

4. The battery cell according to claim 3, in, The connecting groove is a stepped groove arranged on the side of the first wall close to the accommodating cavity, the breathable component is installed in the stepped groove, and there is a flow gap between the breathable component and the surface of the first wall opposite to the breathable component, and the through hole is connected to the first exhaust channel through the flow gap.

5. The battery cell according to claim 4, in, All the through holes are staggered with the first exhaust channel.

6. The battery cell according to claim 4 or 5, in, The stepped groove includes a mounting groove and a first stepped groove, wherein the first stepped groove is located on a side of the mounting groove away from the accommodating cavity, a radial dimension of the first stepped groove is smaller than a radial dimension of the mounting groove, the connecting piece is installed in the mounting groove, the breathable membrane is located on a side of the connecting piece close to the accommodating cavity, and the through hole and the first exhaust channel are connected through the space in the first stepped groove.

7. The battery cell according to any one of claims 4 to 6, in, The stepped groove includes a mounting groove and a second stepped groove, the second stepped groove is located on a side of the mounting groove close to the accommodating cavity, the radial dimension of the second stepped groove is larger than the radial dimension of the mounting groove, the connecting piece is installed in the mounting groove, and the breathable membrane is located in the space formed by the second stepped groove.

8. The battery cell according to claim 7, in, The connecting member and the mounting groove are connected by welding, and the weld between the connecting member and the mounting groove is accommodated in the second stepped groove.

9. The battery cell according to any one of claims 1 to 8, in, There are multiple through holes, and the multiple through holes are evenly spaced and distributed on the connecting member.

10. The battery cell according to any one of claims 1 to 9, in, The battery cell further includes a protective sheet, which is mounted on a side of the first wall away from the accommodating cavity and blocks the first exhaust channel; A communication channel is formed on one side of the protection sheet facing the first wall, one end of the communication channel is communicated with the first exhaust channel, and the other end of the communication channel is staggered with the first exhaust channel and communicated with the external environment.

11. The battery cell according to claim 10, in, The contour shape of the protection sheet matches the contour shape of the first wall.

12. The battery cell according to claim 10 or 11, in, A glue layer is provided on a surface of the protection sheet on a side close to the first wall. The glue layer includes an escape area, and the escape area forms the connecting channel.

13. The battery cell according to any one of claims 10 to 12, in, The protection sheet is provided with a discharge hole, the discharge hole is staggered with the first exhaust channel, and the first exhaust channel is connected to the discharge hole through the connecting channel.

14. The battery cell according to claim 13, in, The discharge hole is a sampling hole.

15. The battery cell according to claim 13 or 14, in, The housing further includes a peripheral wall, the peripheral edge of the first wall being connected to the peripheral wall; The battery cell also includes a shell insulating film located on the outer surface of the shell, the shell insulating film includes a main body and a connecting flange, the main body covers the surface of the side of the peripheral wall away from the accommodating cavity, and the connecting flange is connected to the main body and covers the edge of the protective sheet away from the accommodating cavity.

16. The battery cell according to any one of claims 13 to 15, in, The exhaust hole is disposed at a middle position of the protection sheet along a thickness direction of the battery cell, and the first exhaust passage is located at one side of the exhaust hole along the thickness direction of the battery cell.

17. The battery cell according to any one of claims 1 to 16, in, The battery cell also includes an insulating pad, which is arranged between the first wall and the battery cell. A second exhaust channel is arranged on the insulating pad. The breathable component is arranged between the first wall and the insulating pad, and the second exhaust channel is connected to the breathable component. The breathable membrane and the insulating pad are arranged at intervals.

18. The battery cell according to claim 17, in, The first exhaust channel and the second exhaust channel are staggered.

19. The battery cell according to claim 17 or 18, in, The through hole is arranged opposite to the second exhaust channel to communicate with the second exhaust channel.

20. The battery cell according to claim 17 or 18, in, The through hole is staggered with the second exhaust channel, and the through hole is communicated with the second exhaust channel.

21. The battery cell according to any one of claims 1 to 20, in, The gas in the accommodating cavity is communicated with the external environment through the first exhaust channel, the connecting member and the breathable membrane.

22. The battery cell according to claim 21, in, The shell is also provided with an explosion-proof valve, and when the pressure of the gas in the accommodating chamber is greater than a preset threshold, the gas in the accommodating chamber is discharged through the explosion-proof valve.

23. A battery, wherein, it includes the battery cell described in any one of claims 1 to 22.

24. An electrical device, wherein, it includes the battery cell described in any one of claims 1 to 22 or the battery described in claim 23.

25. An energy storage device, wherein, it includes the battery cell described in any one of claims 1 to 22 or the battery described in claim 23.

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