Battery monomer, battery, power utilization device and energy storage device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery monomer, a battery, a power utilization device and an energy storage device. The battery monomer comprises a shell, a battery cell and a ventilation assembly, the shell is provided with a containing cavity and comprises a first wall, and a first exhaust channel is formed in the first wall. The battery cell is arranged in the accommodating cavity; the ventilation assembly is installed on the first wall and covers the first exhaust channel, the ventilation assembly comprises a connecting piece and a ventilation film, at least one through hole is formed in the connecting piece, and the ventilation film covers all the through holes. The battery monomer provided by the embodiment of the utility model has relatively high reliability and relatively long service life.

Description

Technical Field

[0001] The present application 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 areas such as energy storage.

[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 reduce the service life of battery cells. Utility Model Content

[0005] In view of this, the present application 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.

[0006] This application is implemented through the following technical solutions.

[0007] The first aspect of the present application provides a battery cell, which includes a housing, a battery cell and a ventilated component. The housing has a receiving cavity, and the housing includes a first wall, and a first exhaust channel is provided on the first wall. The battery cell is provided in the receiving cavity. The ventilated component is mounted on the first wall and covers the first exhaust channel, and the ventilated component includes a connector and a ventilated membrane, and the connector is provided with at least one through hole, and the ventilated membrane covers all the through holes.

[0008] In the battery cell provided in the embodiment of the present application, 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 be used to 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 be discharged from the battery cell in time; in addition, for the explosion-proof valve provided on the shell, the risk of premature opening of the explosion-proof valve can also be reduced. Therefore, through the above-mentioned settings, the battery cell provided in the embodiment of the present application can improve the reliability of the battery cell and increase the life of the battery cell.

[0009] In a possible implementation of the present application, the air permeable component is disposed on a side of the first exhaust channel close to the accommodating cavity, and the air permeable membrane is disposed on a side of the connecting member close to the accommodating cavity.

[0010] In a possible implementation of the present application, a connecting groove is provided on one side of the first wall close to the accommodating cavity, the connecting groove is connected to the first exhaust channel and the accommodating cavity, and the air permeable component is installed in the connecting groove.

[0011] In a possible implementation of the present application, 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.

[0012] In a possible implementation of the present application, all the through holes are staggered with the first exhaust channel.

[0013] In a possible implementation of the present application, the step groove includes a mounting groove and a first step groove, the first step groove is located on the side of the mounting groove away from the accommodating cavity, the radial dimension of the first step 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 step groove.

[0014] In a possible implementation of the present application, the step groove includes a mounting groove and a second step groove, the second step groove is located on the side of the mounting groove close to the accommodating cavity, the radial dimension of the second step 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 step groove.

[0015] In a possible implementation of the present application, 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.

[0016] In a possible implementation of the present application, there are multiple through holes, and the multiple through holes are evenly spaced and distributed on the connecting member.

[0017] In a possible implementation of the present application, the battery cell also includes a protective sheet, which is installed on a 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.

[0018] In a possible implementation of the present application, a contour shape of the protection sheet matches a contour shape of the first wall.

[0019] In a possible implementation of the present application, a surface of the protection sheet on one 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.

[0020] In a possible implementation of the present application, 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.

[0021] In a possible implementation of the present application, the discharge hole is a sampling hole.

[0022] In a possible implementation of the present application, the shell also includes a peripheral wall, and the peripheral 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, 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.

[0023] In a possible implementation of the present application, the exhaust hole is disposed 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.

[0024] In a possible implementation of the present application, 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 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.

[0025] In a possible implementation of the present application, the first exhaust channel and the second exhaust channel are staggered.

[0026] In a possible implementation of the present application, the through hole is arranged opposite to the second exhaust channel to be in communication with the second exhaust channel.

[0027] In a possible implementation of the present application, the through hole and the second exhaust channel are staggered, and the through hole and the second exhaust channel are communicated.

[0028] In a possible implementation of the present application, the gas in the accommodating chamber is connected to the external environment through the first exhaust channel, the connecting piece and the breathable membrane.

[0029] In a possible implementation of the present application, 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.

[0030] A second aspect of the present application provides a battery, which includes a battery cell provided in any one of the first aspects.

[0031] A third aspect of the present application provides an electrical device, which includes the battery cell provided in any one of the first aspects or the battery provided in the second aspect.

[0032] A fourth aspect of the present application 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.

[0033] Since the battery, electrical device or energy storage device provided in the embodiments of the present application includes the battery cell provided in any one of the first aspects, it has the same technical effect, higher reliability and longer life. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0035] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application;

[0036] Figure 2 A three-dimensional exploded schematic diagram of a battery provided in some embodiments of the present application;

[0037] Figure 3 A schematic diagram of the overall structure of a battery cell provided in some embodiments of the present application;

[0038] Figure 4 An exploded schematic diagram of a battery cell provided for some embodiments of the present application;

[0039] Figure 5 A schematic diagram of assembling a first wall and an insulating pad of a battery cell provided in some embodiments of the present application;

[0040] Figure 6 An exploded schematic diagram of a first wall and an insulating pad of a battery cell provided in some embodiments of the present application;

[0041] Figure 7 An enlarged schematic diagram of a first exhaust channel, a second exhaust channel, and a venting component of a battery cell provided in some embodiments of the present application;

[0042] Figure 8 An enlarged schematic diagram of a first exhaust channel, a second exhaust channel, and a venting component of a battery cell provided in some embodiments of the present application;

[0043] Fig. 9An enlarged schematic diagram of a first exhaust channel, a second exhaust channel, and a venting component of a battery cell provided in some embodiments of the present application;

[0044] Fig.10 A schematic diagram of the arrangement of a protective sheet for a battery cell provided in some embodiments of the present application;

[0045] Fig.11 A schematic diagram of the arrangement of a protective sheet for a battery cell provided in some embodiments of the present application;

[0046] Fig.12 A schematic diagram of the arrangement of a protective sheet for a battery cell provided in some embodiments of the present application;

[0047] Fig.13 A schematic diagram of the arrangement of a protective sheet for a battery cell provided in some embodiments of the present application.

[0048] Description of Reference Numerals

[0049] 01-vehicle; 011-battery; 0111-battery bottom plate; 0112-battery cover plate; 0113-battery vertical plate; 0114-battery monomer; 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 film;131-main body;132-connecting flange;14-explosion-proof valve installation hole;15-peripheral wall;2-battery cell;21-battery cell insulation film;3-breathable component;31-connector;311-through hole;312-weld;32-breathable 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 application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

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

[0052] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0053] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood 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 application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0055] In the description of the embodiments of the present application, the orientation or position relationship 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 orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0056] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

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

[0058] Below, this application is described in detail.

[0059] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[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 application may refer to a battery pack or a battery module.

[0061] It should be noted that the battery in the embodiment of the present application can be used in, but not limited to, energy storage power supply systems, vehicles, ships, aircraft and other electrical devices. Moreover, the battery pack or battery module is formed by placing a plurality of battery cells in a sealed box, which has more reliable dust and water resistance, and can therefore be used in harsher, humid, or even submerged environments.

[0062] The embodiment of the present application provides an electric device including the above-mentioned battery or battery pack for providing electric energy, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

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

[0064] Figure 1 The schematic diagram of the structure of the vehicle 01 provided in some embodiments of the present application. The vehicle 01 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1 As shown, a battery 011 is disposed inside the vehicle 01, and the battery 011 can be disposed at the bottom, head, or tail of the vehicle 01. The battery 011 can be used to power the vehicle 01, for example, the battery 011 can be used as an operating power source for the vehicle 01. The vehicle 01 may also include a controller 012 and a motor 013, and the controller 012 is used to control the battery 011 to power the motor 013, for example, for the starting, navigation, and working power requirements of the vehicle 01 during driving.

[0065] In some embodiments of the present application, the battery 011 can not only serve as an operating power source for the vehicle 01 , but also serve 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 This is a three-dimensional exploded schematic diagram of the battery 011 provided in the embodiment of the present application. Figure 2 As shown, the battery 011 includes a battery base plate 0111, a battery cover 0112, a battery vertical plate 0113 and at least one battery cell 0114. The battery cover 0112 covers the battery base plate 0111, thereby forming a storage space for the battery cell 0114 between the battery base plate 0111 and the battery cover 0112.

[0067] In the battery 011, there can be multiple battery cells 0114, and the multiple battery cells 0114 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 0114 are both connected in series and in parallel. The multiple battery cells 0114 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 0114 is placed in the accommodation space formed by the battery bottom plate 0111 and the battery cover 0112; of course, the battery 011 can also be a battery module formed by connecting multiple battery cells 0114 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and are accommodated in the accommodation space formed by the battery bottom plate 0111 and the battery cover 0112. The battery 011 can also include other structures. For example, the battery 011 can also include a converging component for realizing the electrical connection between the multiple battery cells 10.

[0068] In the embodiment of the present application, 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 cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0070] Although not shown in the figure, 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 embedded and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

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

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

[0074] As the use environment of the battery cell changes, such as under different external air pressures, or different external temperatures and changes in the temperature of the battery cell, this will cause the air pressure inside the battery cell to be unbalanced with the external air pressure. Alternatively, during the use of the battery cell, as the electrolyte of the battery cell is gradually consumed, a certain amount of gas will be generated, thereby increasing the air pressure inside the battery cell. All of the above factors will pose a risk to the integrity of the battery cell's outer shell, reduce the reliability of the battery cell, and reduce the service life of the battery cell. For example, for a battery cell equipped with an explosion-proof valve, the above factors may cause the explosion-proof valve to open prematurely, reducing the service life of the battery cell.

[0075] In view of this, embodiments of the present application 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 application is taken as an example of a vehicle 01. The following is a description with reference to the accompanying drawings.

[0077] Below, refer to Figures 3 to 13 Some embodiments of the present application are described in detail.

[0078] Specifically, refer to Figures 3 to 9 The battery cell provided in the embodiment of the present application includes a housing 1, a battery cell 2 and a venting component 3. The housing 1 has a housing cavity 11, and the housing 1 includes a first wall 12, and a first exhaust channel 121 is provided on the first wall 12. The battery cell 2 is arranged in the housing cavity 11. The venting component 3 is installed on the first wall 12 and covers the first exhaust channel 121. The venting component 3 includes a connector 31 and a venting membrane 32. The connector 31 is provided with at least one through hole 311, and the venting membrane 32 covers all the through holes 311.

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

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

[0081] In addition, refer to Figure 3 and Figure 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 shell 1 .

[0082] It is understood that in the embodiment of the present application, the housing 1 is used to form a receiving cavity 11, and the receiving cavity 11 is used to place the battery cell 2. The housing 1 may include a plurality of different walls. Figure 3 For a square battery cell, the housing 1 of the battery cell includes six side walls located at the top, bottom, left, right, front and back of the battery cell. In the embodiment of the present application, the first exhaust channel 121 can be set on any one of the six side walls. For this, one of the six side walls on which the first exhaust channel 121 is set can be considered as the first wall 12.

[0083] In addition, in the embodiment of the present application, the type of the first exhaust channel 121 is not limited. For example, refer to Figures 7 to 9 The first exhaust channel 121 can be set as a straight hole extending in a straight line and penetrating both sides of the first wall 12, so that 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 set as a curved channel or various types of channels in the form of stepped grooves, so that the first exhaust channel 121 can also be formed by using the above channels.

[0084] It is understood that in the embodiment of the present application, 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 application, the specific structural form of the breathable membrane 32 is not limited. For example, the breathable membrane 32 can be set to a polymer porous structure. By adjusting the pore size of the porous structure, the breathable membrane 32 can meet the purpose of allowing gaseous substances to pass through and isolating liquid substances. In this way, the breathable membrane 32 can be used to reduce the risk of electrolyte leakage in the battery cell. At the same time, it can also reduce the risk of external liquid (such as water, etc.) entering the battery cell and affecting the reliability of the battery cell 2. Specifically, in some embodiments of the present application, the breathable membrane 32 can be set to a breathable membrane 32 made of polytetrafluoroethylene.

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

[0087] It should be noted that, in the embodiment of the present application, the specific structural form of the connecting member 31 is not limited. Figures 6 to 9 The connecting member 31 may be configured as a thin plate structure, and the through hole 311 may be formed by providing straight holes penetrating through both sides of the thin plate structure on the thin plate structure.

[0088] In addition, it should be noted that in the embodiment of the present application, 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 application is not limited to this.

[0089] For example, refer to Figures 6 to 9 In some embodiments of the present application, 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 and distributed 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 application, 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. Further, in the embodiment of the present application, 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 side of the first exhaust channel 121 away from the accommodating cavity 11; in addition, in the embodiment of the present application, 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 side of the first exhaust channel 121 close to the accommodating cavity 11.

[0092] Furthermore, in the embodiment of the present application, the relative positions of the connecting member 31 and the breathable membrane 32 are not limited. Figures 7 to 9 , the breathable membrane 32 can be arranged on the side of the connecting member 31 close to the accommodating cavity 11. In addition, the breathable membrane 32 can also be arranged on the side of the connecting member 31 away from the accommodating cavity 11.

[0093] Through the above arrangement, in the battery cell provided in the embodiment of the present application, by setting the first exhaust channel 121 on the first wall 12 of the shell 1, installing the breathable component 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 breathable membrane 32, so that the first exhaust channel 121, the connector 31 and the breathable membrane 32 can be used to form a channel for gas flow, keep the pressure in the accommodating chamber 11 balanced with the pressure of the external environment, and reduce the risk of deformation of the shell 1 (such as bulging deformation or concave deformation). In this way, the gas generated by the consumption of the electrolyte can also be discharged from the battery cell in time; in addition, for the explosion-proof valve 4 provided on the shell 1, the risk of premature opening of the explosion-proof valve 4 can also be reduced. Therefore, through the above arrangement, the battery cell provided in the embodiment of the present application 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 in the embodiment of the present application, 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 .

[0095] It is understandable 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 in the external environment (such as 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, so that the gas pressure in the accommodating chamber 11 is balanced 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, so that the gas pressure in the accommodating chamber 11 is balanced with the gas pressure in the external environment.

[0096] It should be noted that in some other embodiments of the present application, other structures may be arranged between the first wall 12 of the battery cell and the accommodating cavity 11, or other structures may be arranged on the side of the first wall 12 away from the accommodating cavity 11. In this way, channels may be arranged on the other structures 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 gas permeable membrane 32 and other channels.

[0098] Through the above arrangement, in the battery cell provided in the embodiment of the present application, 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 media, thereby further protecting the battery cell 2.

[0099] In addition, refer to Figure 6 In some embodiments of the present application, an explosion-proof valve 4 is also 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, Figure 6 An explosion-proof valve mounting 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 application, the explosion-proof valve 4 can be made into a thin-film 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, refer to Figure 6 For the thin-sheet explosion-proof valve 4, the thin-sheet 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 is greater than the breaking pressure, the gas in the accommodating chamber 11 will cause the explosion-proof diaphragm 41 to be broken, so that the gas in the accommodating chamber 11 will be discharged through the explosion-proof valve 4. For the convenience of description, the pressure value corresponding to the breaking pressure when the explosion-proof valve 4 is broken can be called a preset threshold. Depending on the type or model of the selected explosion-proof valve 4, the preset threshold corresponding to the explosion-proof valve 4 may be different.

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

[0104] It is understandable that in the embodiment of the present application, the explosion-proof valve 4 is used to quickly discharge the gas or liquid in the accommodating cavity 11 when an abnormality occurs 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, the first exhaust channel 121 and the air-permeable component 3 can be arranged on the same side wall of the housing 1. For example, refer to Figures 4 to 6 In some embodiments of the present application, the explosion-proof valve 4, the first exhaust channel 121, and the breathable component 3 can all be arranged on the side wall of the upper side of the housing 1. In addition, the explosion-proof valve 4, the first exhaust channel 121, and the breathable component 3 can also be arranged on different side walls of the housing 11. For example, the explosion-proof valve 4 can be arranged on the side wall of the upper side of the housing 1, and the first exhaust channel 121 and the breathable component 3 can be arranged on the side wall of the left or right side of the housing 1.

[0106] In addition, in the embodiment of the present application, the explosion-proof valve 4 and the first exhaust channel 121 and the breathable component 3 are independent of each other. When the electrolyte is gradually consumed and gas is generated in the accommodating chamber 11, the above-mentioned gradually generated gas can be discharged through the first exhaust channel 121 and the breathable component 3, so that the pressure in the accommodating chamber 11 is not greater than the valve opening pressure of the explosion-proof valve 4, so that the explosion-proof valve 4 is not damaged. In the case of abnormality in the battery cell, the pressure in the accommodating chamber 11 rises rapidly, and the first exhaust channel 121 and the breathable component 3 cannot meet the gas discharge requirements in the accommodating chamber 11. When the pressure of the gas in the accommodating chamber 11 is greater than the preset threshold, the explosion-proof valve 4 is damaged, and the gas in the accommodating chamber 11 can be quickly 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 application, 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 the breathable membrane 32 can be arranged 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, refer to Figures 7 to 9 In some embodiments of the present application, the breathable component 3 is disposed on a side of the first exhaust channel 121 close to the accommodating cavity 11 , and the breathable membrane 32 is disposed on a side of the connecting member 31 close to the accommodating cavity 11 .

[0111] It should be noted that, in the embodiment of the present application, the air permeable 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 air permeable component 3 covers the opening of the first exhaust channel 121 close to the accommodating cavity 11. On this basis, the air permeable membrane 32 can be arranged on the side of the connecting member 31 close to the accommodating cavity 11 by adaptively setting the relative positions of the connecting member 31 and the air permeable membrane 32.

[0112] In this way, the gas in the accommodating chamber 11 is discharged to the external environment through the gas permeable 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] Through the above arrangement, the air permeable membrane 32 can be as close to the accommodating cavity 11 as possible, which can further reduce the loss of electrolyte in the battery cell and increase the service life of the battery cell. At the same time, through the above arrangement, the first wall 12 and the connector 31 can be used to protect the air permeable membrane 32, reducing the risk of damage to the air permeable membrane 32, thereby further improving the reliability of the battery cell and increasing the service life of the battery cell.

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

[0115] Specifically, refer to Figure 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 connecting groove 124. Further, the connecting groove 124 may be used to install the air permeable component 3.

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

[0117] For example, refer to Figure 7 ,by Figure 7 The first exhaust channel 121 may be disposed on the bottom wall of the connecting groove 124 away from the accommodating chamber 11, so that the first exhaust channel 121 and the connecting groove 124 can be connected.

[0118] In addition, the opening of the communicating groove 124 on one side facing the accommodating cavity 11 may be arranged to face the accommodating cavity 11 , so that the communicating groove 124 can be communicated with the accommodating cavity 11 .

[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 application, on the basis of installing the breathable component 3 to the connecting groove 124, the breathable membrane 32 can be arranged on the side of the connecting member 31 close to the accommodating cavity 11; in addition, the breathable membrane 32 can also be arranged 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 application, by providing the connecting groove 124 on the side of the first wall 12 close to the accommodating cavity 11 , the installation of the ventilating component 3 can be facilitated.

[0122] On this basis, in some embodiments of the present application, 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 on 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] Further, the surface of the first wall 12 opposite to the air component 3 can also be considered as the portion of the surface of the air component 3 on the side close to the accommodating cavity 11 located in the connecting groove 124. On this basis, by adjusting the position of the air component 3 in the connecting groove 124, a flow gap can be provided between the air component 3 and the surface of the first wall 12 opposite to the air component 3.

[0125] For example, refer to Figure 7 By adjusting the position of the breathable component 3 installed in the connecting groove 124, a gap can be formed between the breathable component 3 and the bottom wall of the connecting groove 124 away from the accommodating chamber 11, so that the gap can be used to form the above-mentioned flow gap. In this way, the through hole 311 can be connected to the first exhaust channel 121 by using the above-mentioned flow gap.

[0126] Through the above arrangement, in the battery cell provided in the embodiment of the present application, by setting the communication groove 124 as the step groove 1241 on the side of the first wall 12 close to the accommodating cavity 11, and installing the ventilating component 3 in the step groove 1241, it is convenient to install the ventilating component 3 in the step groove 1241, and the step groove 1241 can be used to position the ventilating component 3. At the same time, by setting a flow gap between the ventilating component 3 and the surface of the first wall 12 opposite to the ventilating component 3, the flow gap can be used to ensure the communication between the through hole 311 and the first exhaust channel 121.

[0127] On this basis, refer to Figure 7 In some embodiments of the present application, all the through holes 311 and the first exhaust channels 121 are staggered.

[0128] It should be noted that, refer to Figure 7Here, all the through holes 311 are staggered with the first exhaust channel 121, which means that there is no overlapping portion 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 accommodating cavity 11.

[0129] For example, refer to Figure 7 In some embodiments of the present application, 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 arrangement, in the battery cell provided in the embodiment of the present application, all the through holes 311 and the first exhaust channel 121 are staggered, and the connecting member 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 chamber 11 through the first exhaust channel 121, and 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, so that the breathable membrane 32 can be protected. Exemplarily, for setting the first wall 12 as the upper side wall of the battery cell, it can reduce the risk of debris outside the battery cell directly falling into the accommodating chamber 11 through the first exhaust channel 121.

[0131] In addition, refer to Figures 7 to 9 In the battery cells provided in some embodiments of the present application, the step groove 1241 includes a mounting groove 12411 and a first step groove 12412, the first step groove 12412 is located on the side of the mounting groove 12411 away from the accommodating cavity 11, the radial dimension of the first step 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 step groove 12412.

[0132] For example, refer to Figure 7 In some embodiments of the present application, the stepped groove 1241 may be configured to include a mounting groove 12411 and a first stepped groove 12412. Furthermore, the first stepped groove 12412 may be located on a side of the mounting groove 12411 away from the accommodating cavity 11 by adaptively configuring the positions and sizes of the mounting groove 12411 and the first stepped groove 12412, 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 a 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 first step groove 12412 along a direction perpendicular to the axial direction of the mounting groove 12411 .

[0134] For example, refer to Figure 7 ,by Figure 7 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 application, 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 application, the through hole 311 and the first exhaust channel 121 can be arranged opposite to each other, so that 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, so that 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 application, the space in the first stepped groove 12412 can be used to form a flow gap between the through hole 311 and the first exhaust channel 121, so that the setting of the flow gap can be facilitated. At the same time, the space in the first stepped groove 12412 can be used to set the through hole 311 and the first exhaust channel 121 differently, such as the through hole 311 and the first exhaust channel 121 can be set relative to each other or staggered, so as to improve the flexibility of setting the first exhaust channel 121 or the through hole 311.

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

[0140] For example, refer to Figure 7 In some embodiments of the present application, the stepped groove 1241 may be configured to include a mounting groove 12411 and a second stepped groove 12413. Furthermore, the second stepped groove 12413 may be located on a side of the mounting groove 12411 close to the accommodating cavity 11 by adaptively configuring the positions and sizes of the mounting groove 12411 and the second stepped groove 12413, 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 a direction perpendicular to the axial direction of the second step groove 12413; the radial dimension of the mounting groove 12411 refers to the dimension of the mounting groove 12411 along a direction perpendicular to the axial direction of the mounting groove 12411.

[0142] For example, refer to Figure 7 ,by Figure 7 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 application, 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 application, by arranging the stepped groove 1241 to include the mounting 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, in reference Figures 7 to 9 In some embodiments of the present application, the connecting member 31 and the mounting groove 12411 are connected by welding, and the weld 312 between the connecting member 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 application, the first wall 12 can be made of metal material, and the connecting member 31 can also be made of a metal structure, so that the connecting member 31 can be connected to the first wall 12 by welding. In addition, the first wall 12 can also be made of plastic material, and the connecting member 31 can also be made of plastic material, so that the connecting member 31 and the first wall 12 can be connected by ultrasonic welding.

[0148] For example, refer to Fig. 9 For setting 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 set flush with the lower surface of the connecting member 31, and the connection is made by welding at the position where the edge of the lower surface of the connecting member 31 is connected to the mounting groove 12411. In this way, the depth of the second stepped groove 12413 can be adaptively set so that the second stepped groove 12413 can accommodate the weld 312 between the connecting member 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 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 application.

[0150] In addition, refer to Figures 7 to 9 In some embodiments of the present application, there are multiple through holes 311 , and the multiple through holes 311 are evenly spaced and distributed on the connecting member 31 .

[0151] It should be noted that in the embodiment of the present application, 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 to various shapes such as a square or a teardrop shape.

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

[0153] With respect to arranging the plurality of through holes 311 in a circular array distribution, another through hole 311 may be arranged on the connecting member 31 at the center of the circular array distribution of the plurality of through holes 311 .

[0154] Through the above arrangement, in the battery cell provided in the embodiment of the present application, while ensuring that the flow area of ​​the flow channel formed by the through hole 311 is constant, the through hole 311 is dispersedly arranged into a plurality, which can ensure the strength of the connector 31. At the same time, the through hole 311 is dispersedly arranged into a plurality, which can also ensure that the connector 31 forms a good support for the breathable membrane 32.

[0155] In addition, refer to Figure 8 In some embodiments of the present application, 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 application, 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 ventilation component 3.

[0157] In this regard, in the embodiment of the present application, the protective sheet 6 may be attached to the side of the first wall 12 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 may be provided on the side of the protective sheet 6 facing the first wall 12, or a gap may be provided between the protective sheet 6 and the first wall 12 to form the above-mentioned connecting channel 61.

[0158] For example, refer to Figure 8 ,by Figure 8 Taking the relative position in as an example, the first exhaust channel 121 extends in the vertical direction, and the connecting channel 61 extends in the horizontal direction. The 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 in 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 application are not limited to this.

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

[0161] It should be noted that, in the application embodiment, the connecting channel 61 can be extended to the edge of the protective sheet 6, so that the first exhaust channel 121 can be connected to the edge of the protective sheet 6, and finally the first exhaust channel 121 is connected to the external environment. In addition, a hole can be set in the middle of the protective sheet 6, and the first exhaust channel 121 can be connected to the hole set in the middle of the protective sheet 6, and finally the first exhaust channel 121 is connected to the external environment.

[0162] Through the above arrangement, in the battery cell provided in the embodiment of the present application, the protective sheet 6 can be used to protect the first exhaust channel 121, and the risk of foreign matter outside the battery cell entering the first exhaust channel 121 can be reduced. At the same time, by providing a connecting channel 61 between the first wall 12 and the protective sheet 6, the connection between the first exhaust channel 121 and the external environment can be ensured.

[0163] On this basis, refer to Figure 3 and Figure 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 as the size of the protective sheet 6 being 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 accommodating cavity 11 .

[0165] It is understandable that in the embodiment of the present application, the protective sheet 6 can be arranged to extend along the surface of the first wall 12 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, for forming the protective sheet 6 using the top patch of the battery cell, it is not necessary to set the protective sheet 6 separately.

[0166] Thus, in the embodiment of the present application, the protective sheet 6 can be used to perform an insulating function to prevent the first wall 12 from being short-circuited with an external circuit. At the same time, the protective sheet 6 can also protect the first wall 12 and prevent the first wall 12 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 application, the top patch of the battery cell can be used to form the protective sheet 6, and there is no need to separately arrange the protective sheet 6, thereby enabling the battery cell provided in the embodiments of the present application to save materials and reduce costs.

[0169] On this basis, refer to Figure 3 , Figure 4 , Figures 10 to 13 A surface of the protection sheet 6 close to the first wall 12 is provided with an adhesive layer, and 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 application, 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. In this regard, the connecting glue forms an adhesive layer on the side of the protection sheet 6 close to the first wall 12.

[0171] Furthermore, a part of the area on the protective sheet 6 may be reserved for the first exhaust channel 121 without setting the connecting glue, so that the part of the area on the protective sheet 6 without setting the connecting glue forms an avoidance area 67. Since the connecting glue set on the protective sheet 6 has a certain thickness, the above-mentioned avoidance area 67 is equivalent to forming a groove, and by adaptively not setting the connecting glue from the position corresponding to the first exhaust channel 121 to the position communicating with the external environment on the protective sheet 6, 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 set on the protective sheet 6) can form the above-mentioned connecting channel 61 by using the above-mentioned groove.

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

[0173] For example, in the above-mentioned connecting the first exhaust channel 121 to the hole set in the protective sheet 6 through the connecting channel 61, an area without connecting glue can be reserved between the position of the first exhaust channel 121 on the protective sheet 6 and the position of the hole (such as the sampling hole 62) to form an avoidance area 67, so that the above-mentioned connecting channel 61 can be formed by using the avoidance area 67. It should be noted that, referring to Figures 10 to 13 , a connection adhesive may be provided in other areas outside the avoidance area 67 to form a connection area 66 to connect the protection sheet 6 to the first wall 12 .

[0174] It should be noted that, refer to Figures 10 to 13In the embodiment of the present application, 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, refer to Fig.10 In some embodiments of the present application, the sampling hole 62 can be set to a rectangular shape, and the avoidance area 67 can also be set to a rectangular shape, and the long side of the rectangle corresponding to the avoidance area 67 is overlapped with the side of the sampling hole 62. Fig.11 In some embodiments of the present application, the avoidance area 67 may 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, so that the rectangular area is connected to the sampling hole 62 along the shortest distance direction from the sampling hole 62. In addition, referring to Fig.12 In some embodiments of the present application, the avoidance area 67 may 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, so that the bottom edge of the triangular area coincides with the side edge of the sampling hole 62. Fig.13 In some embodiments of the present application, the avoidance area 67 may be set to be a trapezoid, and the long side corresponding to the avoidance area 67 may be 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 application.

[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 application, a discharge hole 68 is provided on the protection sheet 6 , and the discharge hole 68 is staggered with the first exhaust channel 121 , and 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 application, 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 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 arranged as the discharge hole 68.

[0180] In addition, in the embodiment of the present application, the staggered arrangement of the exhaust hole 68 and the first exhaust channel 121 means that the exhaust hole 68 is not opposite to the first exhaust channel 121. 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 the 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 application, by arranging 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 application, the discharge hole 68 is the sampling hole 62 .

[0184] It should be noted that in the embodiment of the present application, the sampling hole 62 can be used to set the temperature collection 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 application does not limit the role of the sampling hole 62.

[0185] Through the above arrangement, in the battery cell provided in the embodiment of the present application, 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, so that the structure of the protection sheet 6 in the embodiment of the present application is simple and easy to manufacture.

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

[0187] For example, for the above-mentioned peripheral wall 15, it can be considered that the peripheral wall 15 is a side wall of the battery cell connected to the peripheral edge of the first wall 12. Figure 3 and Figure 8 ,by Figure 3 and Figure 8Taking the relative position in as an example, it can be considered that the first wall 12 is the upper wall of the outer shell 1 of the battery cell, and the peripheral wall 15 is the front, back, left and right side walls of the outer shell 1.

[0188] It should be noted that in the embodiment of the present application, the shell insulating film 13 is located on the outer surface of the shell 1. The shell insulating film 13 can play an isolating role, can effectively isolate the battery cell from the external environment, and at the same time, can also play a protective role for the battery cell. The shell insulating film 13 can be made of materials such as polypropylene, polyimide, and polyamide.

[0189] In order to ensure the connection between the shell insulating film 13 and the shell 1, refer to Figure 4 and Figure 8 The shell insulating film 13 includes a main body 131 and a connecting flange 132. The main body 131 covers the surface of the side of the peripheral wall 15 away from the accommodating cavity 11, and the surface of the side of the peripheral wall 15 away from the accommodating cavity 11 can also be considered as the outer surface of the peripheral wall 15. The connecting flange 132 is equivalent to the flange structure of the main body 131, and the connecting flange 132 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. At the same time, in the above embodiment, by connecting the connecting channel 61 to the exhaust hole 68 instead of the edge of the protective sheet 6, it can be ensured that the first exhaust channel 121 is connected to the external environment.

[0191] On this basis, refer to Figure 3 and Figure 4 The exhaust hole 68 is disposed in the middle of the protection 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 application, the discharge hole 68 is arranged in the middle of the protective sheet 6 along the thickness direction of the battery cell. In this way, the arrangement of the discharge hole 68 can be facilitated and the discharge hole 68 can be prevented from being covered by the connecting flange 132, so that the normal use of the discharge hole 68 can be ensured. On this basis, in the embodiment of the present application, the first exhaust channel 121 is located on one side of the discharge hole 68 along the thickness direction of the battery cell.

[0193] It should be noted that, in the embodiment of the present application, the first exhaust channel 121 may be disposed on the upper side or the lower side of the exhaust hole 68 along the thickness direction of the battery cell relative to the exhaust hole 68, and the embodiment of the present application is not limited to this.

[0194] Through the above-mentioned arrangement, in the battery cell provided in the embodiment of the present application, 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 makes it convenient to set the first exhaust channel 121 and ensures that the shape of the protective sheet 6 remains unchanged, thereby eliminating the need to set the protective sheet 6 for the first exhaust channel 121, thereby saving the manufacturing cost of the battery cell in the embodiment of the present application.

[0195] In addition, refer to Figures 5 to 9 In some embodiments of the present application, the battery cell also includes an insulating pad 5, which is arranged between the first wall 12 and the battery cell 2. A second exhaust channel 51 is arranged on the insulating pad 5. The breathable component 3 is arranged between the first wall 12 and the insulating pad 5. 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 application, 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. Exemplarily, 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, refer to Figure 6 , a terminal mounting hole 122 and a liquid injection hole 123 and other structures may also be provided on the first wall 12 and the insulating pad 5. Figure 4 In the battery cell, a sealing nail 1231 is also installed on the injection hole 123, and a terminal 1221 and a terminal sealing ring 1222 are also installed on the terminal installation 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 a second exhaust channel 51. Figures 6 to 9 In the embodiment of the present application, a straight hole penetrating through both sides of the insulating pad 5 can be provided on the insulating pad 5 to form the second exhaust channel 51. It can be understood that in the embodiment of the present application, the cross section of the second exhaust channel 51 can be set to a circular shape. In addition, the cross section of the second exhaust channel 51 can also be set to other shapes, for example, the cross section of the second exhaust channel 51 can be set to a square shape, etc.

[0199] Reference Figures 7 to 9In the embodiment of the present application, 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 connected by using the breathable component 3.

[0200] In addition, refer to Figures 7 to 9 In some embodiments of the present application, the air permeable component 3 may be sandwiched between the first wall 12 and the insulating pad 5. Specifically, a connecting groove 124 may be provided on the first wall 12 or the insulating pad 5 to accommodate the air permeable component 3. Furthermore, the two ends of the connecting groove 124 may be connected to the first exhaust channel 121 or the second exhaust channel 51 respectively so that the first exhaust channel 121 and the second exhaust channel 51 are connected through the air permeable component 3.

[0201] Further, see Figures 7 to 9 In the embodiment of the present application, the breathable film 32 and the insulating pad 5 are also spaced apart. It should be noted that the spaced apart arrangement of the breathable film 32 and the insulating pad 5 here means that there is a gap between the breathable film and the insulating pad 5, so that the breathable film 32 does not contact the insulating pad 5, thereby protecting the breathable film 32 and reducing the risk of the insulating pad 5 damaging the breathable film 32.

[0202] It should be noted that the insulating pad 5 can be adapted to form the above-mentioned avoidance gap, and the first wall 12 can also be adapted to form the above-mentioned avoidance gap. Figure 7 A stepped groove 1241 may be provided on the first wall 12 , and the stepped groove 1241 includes the above-mentioned 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 step 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, so that the breathable membrane 32 and the insulating pad 5 are 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 application, 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 to each other along the direction from the insulating pad 5 to the first wall 12. Figure 7 ,by Figure 7 Taking the relative positions in the as an example, the first exhaust channel 121 can be set on the left side of the first wall 12, and the second exhaust channel 51 can be set 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 has no overlapping part with the first exhaust channel 121.

[0207] Reference Figure 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 accommodation chamber 11 through the first exhaust channel 121 and the second exhaust channel 51 can be reduced, and the battery cell 2 can be protected. Exemplarily, when 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 accommodation chamber 11 through the first exhaust channel 121 and the second exhaust channel 51 can be reduced.

[0209] Further, see Figure 8 In some embodiments of the present application, the through hole 311 is arranged opposite to the second exhaust channel 51 to be connected with the second exhaust channel 51.

[0210] Here, the through hole 311 and the second exhaust channel 51 are arranged opposite to each other, which means that the through hole 311 and the second exhaust channel 51 are directly opposite to each other, so that the through hole 311 and the second exhaust channel 51 can make the flow channel between the through hole 311 and the second exhaust channel 51 extend along a straight line. Figure 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, so that the flow capacity between the through hole 311 and the second exhaust channel 51 can be guaranteed, so as to facilitate the exhaustion of the gas in the accommodating cavity 11.

[0212] In addition, refer to Fig. 9In some embodiments of the present application, the through hole 311 and the second exhaust channel 51 are staggered, and the through hole 311 and the second exhaust channel 51 are communicated.

[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 portion 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 chamber 11.

[0214] On this basis, a flow 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, refer to Fig. 9 The space in the second stepped groove 12413 can 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 embodiment of the present application also provides a battery, which includes the battery cell provided in the above embodiment. It should be noted that in the embodiment of the present application, the battery generally refers to a battery pack or a battery module.

[0218] Furthermore, an embodiment of the present application 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 in the embodiments of the present application includes the battery cell provided in the aforementioned embodiments, it has the same technical effect and can improve the reliability of the battery cell and increase the life of the battery cell.

[0220] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. 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 application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: All the through holes are staggered with the first exhaust channel.

6. The battery cell according to claim 4 or 5, characterized in that: The step groove includes a mounting groove and a first step groove, the first step groove is located on a side of the mounting groove away from the accommodating cavity, a radial dimension of the first step 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 step groove.

7. The battery cell according to any one of claims 4 to 6, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: The discharge hole is a sampling hole.

15. The battery cell according to claim 13 or 14, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: The first exhaust channel and the second exhaust channel are staggered.

19. The battery cell according to claim 17 or 18, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 22.

24. An electrical device, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 22 or the battery according to claim 23.

25. An energy storage device, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 22 or the battery according to claim 23.

Images