Battery cell, battery and electrical device

Abstract

The present application belongs to the technical field of batteries. Provided are a battery cell, a battery and an electrical device. The battery cell comprises a casing, an electrode component, a one-way valve and a shielding member; the casing is provided with a wall part; the electrode component is accommodated inside the casing; the one-way valve is arranged on the wall part, the one-way valve being provided with a gas outlet, and the gas outlet being used for discharging gas inside the casing; the shielding member is installed on the wall part, and, in the thickness direction of the wall part, the shielding member is located on the side of the one-way valve away from the electrode component, the shielding member covering the one-way valve; and an exhaust passage is formed between the shielding member and the wall part, the exhaust passage communicating the gas outlet and the exterior of the casing. The shielding member can protect and shield the one-way valve so as to reduce the phenomena of abrasion or damage to the one-way valve and reduce the risk of impurities in external environments entering the one-way valve, and can also improve the attractiveness of the outer surface of the battery cell; and detection components and other parts can be conveniently and correspondingly connected to the side of the shielding member away from the one-way valve.

Description

Battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2023107269094, filed on June 16, 2023, entitled “Battery Cell, Battery and Electrical Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0004] In recent years, new energy vehicles have experienced rapid development. In the electric vehicle sector, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. As a core component of new energy vehicles, batteries have high requirements in terms of reliability and service life.

[0005] In battery technology, to ensure the safety of battery cells, a pressure relief mechanism is typically installed on the outer casing of the battery cell to release internal pressure. This mechanism activates and releases pressure when the internal pressure or temperature of the battery cell reaches a threshold. However, existing pressure relief mechanisms in battery cells can prematurely activate during use, resulting in poor stability and hindering the lifespan and reliability of the battery cell.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can effectively improve the service life and reliability of the battery cell.

[0008] In the first aspect, an embodiment of the present application provides a battery cell, comprising a shell, an electrode assembly, a one-way valve and a shielding member; the shell has a wall portion; the electrode assembly is accommodated in the shell; the one-way valve is arranged on the wall portion, and the one-way valve has an air outlet, and the air outlet is used to discharge the gas inside the shell; the shielding member is installed on the wall portion, and along the thickness direction of the wall portion, the shielding member is located on the side of the one-way valve away from the electrode assembly, and the shielding member covers the one-way valve, and an exhaust channel is formed between the shielding member and the wall portion, and the exhaust channel connects the air outlet and the outside of the shell.

[0009] In the above technical solution, a one-way valve is provided on the wall of the shell so that the one-way valve can be opened in one direction and the gas inside the shell can be discharged to the outside of the shell. Therefore, when gas is generated inside the shell during normal use of the battery cell, it can be discharged to the outside of the shell through the one-way valve to alleviate the phenomenon that the internal pressure of the battery cell reaches the threshold value prematurely due to the increase in the internal air pressure of the battery cell, thereby effectively improving the use stability of the battery cell and improving the service life and reliability of the battery cell. In addition, by providing a shielding member on the side of the one-way valve away from the electrode assembly, and the shielding member covers the one-way valve, the shielding member can play a certain protective and shielding role on the one-way valve. On the one hand, it can reduce the wear or damage of the one-way valve in the external environment, and can reduce the risk of impurities or particulate matter in the external environment entering the one-way valve, which is beneficial to improving the service life of the one-way valve. On the other hand, covering the one-way valve by the shielding member can improve the aesthetics of the outer surface of the battery cell. On the other hand, it is convenient to connect other components such as the detection element on the side of the shielding member away from the one-way valve, so as to reduce the interference of the area where the one-way valve is provided on the wall on the connection detection element and other components.

[0010] In some embodiments, along the thickness direction of the wall portion, the wall portion has a first surface facing away from the electrode assembly, the first surface is provided with a mounting groove, the bottom surface of the mounting groove is provided with a mounting hole, at least a portion of the one-way valve is provided in the mounting hole, and at least a portion of the shielding member is accommodated in the mounting groove.

[0011] In the above technical solution, by arranging a mounting groove on the first surface of the wall portion facing away from the electrode assembly, and at least partially accommodating the shielding member in the mounting groove, on the one hand, the space occupied by the shielding member and the wall portion in the thickness direction of the wall portion can be reduced, which is beneficial to optimizing the volume of the battery cell; on the other hand, the mounting groove can play a certain positioning and limiting role on the shielding member, which is beneficial to reducing the difficulty of assembling the shielding member connected to the wall portion.

[0012] In some embodiments, the exhaust channel includes a first exhaust gap formed between the shielding member and a groove side surface of the mounting groove, and the first exhaust gap is used to connect the air outlet and the outside of the housing.

[0013] In the above technical solution, a first exhaust gap connected to the outside of the shell is formed between the shielding member and the side surface of the mounting groove, so that the gas discharged from the one-way valve can be discharged to the outside of the shell through the first exhaust gap. The battery cell using this structure does not need to have a channel opened on the shielding member, which is conducive to reducing processing difficulty and improving the appearance of the battery cell.

[0014] In some embodiments, the outer peripheral surface of the shielding member includes a first corner surface and at least two first side surfaces, and the first corner surface connects two adjacent first side surfaces; the groove side surface of the mounting groove includes a second corner surface and at least two second side surfaces, and the second corner surface connects two adjacent second side surfaces, each second side surface is connected to one first side surface, and the first exhaust gap is formed between the second corner surface and the first corner surface.

[0015] In the above technical solution, two adjacent first side surfaces in the outer peripheral surface of the shielding member are connected by a first corner surface, and two connected second side surfaces in the groove side surface of the mounting groove are connected by a second corner surface, each first side surface is connected to a second side surface, and a first gap is formed between the first corner surface and the second corner surface, that is, a first exhaust gap is formed at the corner of the shielding member and the mounting groove. On the one hand, it is convenient to form the first exhaust gap between the outer peripheral surface of the shielding member and the groove side surface of the mounting groove. The structure is simple and easy to implement. On the other hand, while realizing the formation of the first exhaust gap between the outer peripheral surface of the shielding member and the groove side surface of the mounting groove, it is beneficial to increase the connection area between the outer peripheral surface of the shielding member and the groove side surface of the mounting groove, which is beneficial to improve the firmness of the shielding member connected to the wall.

[0016] In some embodiments, the first corner surface and the second corner surface are both arc surfaces, and the radius of the first corner surface is greater than the radius of the second corner surface.

[0017] In the above technical solution, by setting the first corner surface and the second corner surface as arc surfaces, and the radius of the first corner surface is greater than the radius of the second corner surface, a first exhaust gap is formed between the first corner surface and the second corner surface. The structure is simple and easy to manufacture and process.

[0018] In some embodiments, the first side surface is connected to the second side surface by welding.

[0019] In the above technical solution, by setting the first side surface and the second side surface as a structure welded to each other, it is helpful to improve the connection firmness between the shielding member and the groove side surface of the installation groove, thereby improving the structural stability of the shielding member assembled to the wall.

[0020] In some embodiments, the cross-section of the shielding member in a direction perpendicular to the thickness of the wall portion is rectangular, the outer peripheral surface of the shielding member includes four first side surfaces and four first corner surfaces, and the first exhaust gap is formed at at least one of the first corner surfaces.

[0021] In the above technical solution, by setting the shielding member as a rectangular plate structure, the four sides of the shielding member form four first side surfaces, and four first corner surfaces are formed at the four right angles of the shielding member, the structure is simple and easy to manufacture.

[0022] In some embodiments, a groove is provided on the outer peripheral surface of the shielding member, and the first exhaust gap is formed between the bottom surface of the groove and the side surface of the mounting groove.

[0023] In the above technical solution, a groove is provided on the outer peripheral surface of the shielding member so that a first exhaust gap for exhaust is formed between the groove bottom surface and the groove side surface of the mounting groove. The structure is simple and easy to manufacture.

[0024] In some embodiments, an area of ​​the outer circumferential surface of the shielding member where the groove is not provided is welded to a groove side surface of the installation groove.

[0025] In the above technical solution, the shielding member is connected to the side surface of the mounting groove by welding the area of ​​the outer peripheral surface of the shielding member where no groove is provided to the side surface of the mounting groove. The battery cell with this structure is beneficial to the firmness of the connection between the shielding member and the wall portion, thereby improving the structural stability of the shielding member assembled to the wall portion.

[0026] In some embodiments, the outer peripheral surface of the shielding member is provided with a plurality of protrusions, and the plurality of protrusions are arranged at intervals along the circumference of the shielding member. The protrusions abut against the side surfaces of the mounting groove, and the first exhaust gap is formed between the area of ​​the outer peripheral surface of the shielding member where the protrusions are not provided and the side surfaces of the mounting groove.

[0027] In the above technical solution, a plurality of protrusions are provided on the outer peripheral surface of the shielding member and are arranged at intervals along the circumference of the shielding member, and the protrusions abut against the side surfaces of the mounting groove, so that a first exhaust gap for exhaust is formed between the area on the outer peripheral surface of the shielding member where no protrusions are provided and the side surfaces of the mounting groove. That is to say, the first exhaust gap is located between two adjacent protrusions, has a simple structure, and is easy to assemble.

[0028] In some embodiments, the protrusion is interference fit with the side surface of the mounting groove.

[0029] In the above technical solution, the shielding member is fixed in the mounting groove by interference fit between the convex portion provided on the outer peripheral surface of the shielding member and the side surface of the mounting groove. The battery cell adopting this structure facilitates the installation of the shielding member on the wall while forming a first exhaust gap between two adjacent convex portions, which helps to reduce the difficulty of assembling the shielding member.

[0030] In some embodiments, the exhaust channel further includes a second exhaust gap formed between the shielding member and the bottom surface of the mounting groove, and the second exhaust gap communicates with the first exhaust gap and the air outlet.

[0031] In the above technical solution, the exhaust channel also includes a second exhaust gap formed between the covering member and the bottom surface of the mounting groove, and the second exhaust gap connects the first exhaust gap and the air outlet to alleviate the phenomenon of exhaust obstruction between the air outlet and the first exhaust gap caused by the covering member abutting against the bottom surface of the mounting groove, thereby improving the smoothness of gas discharge from the air outlet of the one-way valve to the first exhaust gap.

[0032] In some embodiments, along the thickness direction of the wall portion, the shielding member has a second surface facing the one-way valve, the second surface overlaps the bottom surface of the mounting groove, the second surface is provided with a first groove, and the second exhaust gap is formed between the bottom surface of the first groove and the bottom surface of the mounting groove.

[0033] In the above technical solution, the second surface of the shielding member is overlapped on the bottom surface of the mounting groove so that the shielding member is against the bottom surface of the mounting groove, thereby improving the structural stability and reliability of the shielding member installed in the mounting groove. In addition, a first groove is provided on the second surface so that a second exhaust gap is formed between the bottom surface of the first groove and the bottom surface of the mounting groove, so that the gas discharged from the air outlet of the one-way valve can enter the first exhaust gap through the first groove and then be discharged to the outside of the shell, thereby achieving the connection between the first exhaust gap and the air outlet through the first groove while achieving the shielding member against the bottom surface of the mounting groove.

[0034] In some embodiments, a plurality of first exhaust gaps are formed between the shielding member and the side surface of the mounting groove, and the plurality of first exhaust gaps are arranged at intervals along the circumference of the shielding member. A plurality of first grooves are provided on the second surface, and each first exhaust gap is connected to one first groove.

[0035] In the above technical solution, a plurality of first exhaust gaps are formed between the shielding member and the groove side surface of the installation groove, and each first exhaust gap is connected to a first groove, thereby facilitating further improving the exhaust efficiency.

[0036] In some embodiments, the second surface is further provided with a second groove, a plurality of the first grooves are provided around the second groove and are all connected to the second groove, and the second groove is connected to the air outlet.

[0037] In the above technical solution, a second groove is provided on the second surface of the shielding member facing the one-way valve, the second groove is connected to the air outlet of the one-way valve, and a plurality of first grooves are provided around the second groove and are all connected to the second groove, so that the gas discharged from the air outlet of the one-way valve can enter the second groove and then pass through the plurality of first grooves and then pass through the corresponding first exhaust gaps to be discharged to the outside of the shell, which is beneficial to improving the exhaust efficiency and can alleviate the phenomenon of gas accumulation between the shielding member and the one-way valve.

[0038] In some embodiments, along the thickness direction of the wall portion, the gas outlet is arranged at an end of the one-way valve away from the electrode assembly, the gas outlet is arranged facing the second groove, and the projection of the gas outlet is located in the second groove.

[0039] In the above technical solution, the air outlet of the one-way valve and the second groove are arranged to face each other, and the projection of the air outlet in the thickness direction of the wall is located in the second groove, so that the second groove is a structure covering the air outlet in the thickness direction of the wall, so that the gas discharged from the air outlet of the one-way valve can directly enter the second groove, which is beneficial to improving the exhaust smoothness and exhaust efficiency.

[0040] In some embodiments, along a thickness direction of the wall portion, the shielding member does not extend beyond the first surface.

[0041] In the above technical solution, by setting the shielding member so as not to extend beyond the first surface of the wall away from the electrode assembly in the thickness direction of the wall, the shielding member can be protected to a certain extent by the installation groove, thereby further reducing the wear of the shielding member.

[0042] In some embodiments, the shielding member has a third surface facing away from the one-way valve, and the third surface is flush with the first surface.

[0043] In the above technical solution, by setting the third surface of the shielding member facing away from the one-way valve and the first surface of the wall facing away from the electrode assembly to be flush with each other, it is beneficial to further improve the aesthetics of the outer surface of the battery cell, and it is convenient to set information codes or connect other components such as detection elements on the third surface of the shielding member.

[0044] In some embodiments, along the thickness direction of the wall portion, the one-way valve does not extend beyond the bottom surface of the installation groove.

[0045] In the above technical solution, the one-way valve is arranged so as not to exceed the bottom surface of the mounting groove in the thickness direction of the wall, that is, the one-way valve arranged in the mounting hole does not extend into the mounting groove, thereby reducing the interference between the one-way valve and the covering member arranged in the mounting groove, and facilitating the exhaust of the one-way valve.

[0046] In some embodiments, the shielding member is fixedly connected to the wall portion.

[0047] In the above technical solution, by setting the shielding member as a structure fixedly connected to the wall portion, it is helpful to reduce the risk of the shielding member detaching from the wall portion during use, and can improve the firmness of the connection between the shielding member and the wall portion, so as to facilitate the setting of information codes or connection of other components such as detection elements on the shielding member.

[0048] In some embodiments, the one-way valve includes a valve body, an elastic member and a sealing member; the valve body is arranged on the wall portion, an installation cavity is formed inside the valve body, and an air inlet and the air outlet are provided on the valve body, the air inlet is used to connect the installation cavity and the interior of the shell, and the air outlet is used to connect the installation cavity and the exhaust channel; the elastic member is arranged in the installation cavity; the sealing member is movably arranged in the installation cavity, and the sealing member is used to block the air inlet under the action of the elastic member, and is used to open the air inlet under the action of the gas inside the shell.

[0049] In the above technical solution, the one-way valve is provided with a valve body, an elastic member and a sealing member. The valve body is arranged on the wall, and an air inlet connecting the installation cavity and the inside of the shell and an air outlet connecting the installation cavity and the exhaust channel are provided on the valve body. By arranging both the elastic member and the sealing member in the installation cavity, the elastic member can apply elastic force to the sealing member so that the sealing member can block the air inlet to prevent the gas outside the shell from entering the inside of the shell, and when the pressure inside the shell rises, the gas inside the shell can act on the sealing member and overcome the elastic force of the elastic member, so that the sealing member can open the air inlet, thereby allowing the gas inside the shell to be discharged after the one-way opening of the one-way valve, thereby realizing the one-way exhaust function of the one-way valve.

[0050] In some embodiments, the valve body includes a valve body and a valve cover; the valve body is arranged on the wall portion, and the valve body is provided with the air inlet; along the thickness direction of the wall portion, the valve cover is arranged at one end of the valve body away from the electrode assembly, the valve cover and the valve body together enclose the installation cavity, and the valve cover is provided with the air outlet.

[0051] In the above technical solution, the valve body of the one-way valve includes a valve body and a valve cover. The valve cover is connected to the end of the valve body that is away from the electrode assembly in the thickness direction of the wall, so that the valve cover and the valve body jointly define an installation cavity for accommodating the elastic part and the sealing part. The one-way valve with this structure is divided into two parts, which facilitates the assembly of the elastic part and the sealing part into the installation cavity, which helps to reduce the difficulty of assembling the one-way valve.

[0052] In some embodiments, the valve cover and the blocking member are spaced apart along the thickness direction of the wall portion, two ends of the elastic member respectively abut against the valve cover and the blocking member, and the air inlet is arranged on the bottom surface of the installation cavity.

[0053] In the above technical solution, the valve cover and the sealing member are arranged in a structure spaced apart in the thickness direction of the wall, so that the two ends of the elastic member can respectively abut against the valve cover and the sealing member, so that the sealing member can seal the air inlet arranged on the bottom surface of the installation cavity along the thickness direction of the wall under the action of the elastic member. That is to say, the air inlet is arranged at the end of the valve body facing the electrode assembly in the thickness direction of the wall, and the sealing member can move along the thickness direction of the wall and seal the air inlet under the action of the elastic member. The one-way valve with this structure makes it convenient for the elastic member to apply elastic force to the sealing member so that the sealing member blocks the air inlet, and can reduce the difficulty of assembling the elastic member.

[0054] In some embodiments, along the thickness direction of the wall portion, the installation cavity passes through an end of the valve body away from the electrode assembly and forms the gas outlet, and the shielding member is arranged facing the gas outlet.

[0055] In the above technical solution, the installation cavity is set to pass through the end of the valve body away from the electrode assembly in the thickness direction of the wall, so as to form an air outlet at the end of the valve body away from the electrode assembly, and the air outlet is covered by a covering member. The one-way valve with this structure facilitates the assembly of the elastic member and the sealing member into the installation cavity through the air inlet, which helps to reduce the difficulty of assembling the one-way valve.

[0056] In some embodiments, the shielding member and the blocking member are spaced apart along the thickness direction of the wall portion, two ends of the elastic member are respectively against the shielding member and the blocking member, and the air inlet is arranged on the bottom surface of the installation cavity.

[0057] In the above technical solution, the blocking member and the blocking member are spaced apart in the thickness direction of the wall, so that the two ends of the elastic member can respectively abut against the blocking member and the blocking member, so that the blocking member can block the air inlet arranged on the bottom surface of the installation cavity along the thickness direction of the wall under the action of the elastic member. That is to say, the air inlet is arranged at the end of the valve body facing the electrode assembly in the thickness direction of the wall, and the blocking member can move along the thickness direction of the wall and block the air inlet under the action of the elastic member. The one-way valve with this structure makes it convenient for the elastic member to apply elastic force to the blocking member so that the blocking member blocks the air inlet, and can reduce the difficulty of assembling the elastic member.

[0058] In some embodiments, the material of the shielding member is the same as that of the wall.

[0059] In the above technical solution, by setting the shielding member and the wall portion to be structures of the same material, on the one hand, it is convenient to assemble the shielding member and the wall portion of the same material to each other, which is beneficial to reduce the difficulty of assembling the shielding member on the wall portion; on the other hand, the appearance of the shielding member and the wall portion can be made the same, which is beneficial to improve the appearance of the battery cell.

[0060] In some embodiments, the outer shell includes a shell and an end cover; a housing having an opening is formed inside the shell, and the housing cavity is used to accommodate the electrode assembly; the end cover closes the opening; wherein the end cover is the wall portion; or, the shell includes the wall portion.

[0061] In the above technical solution, by configuring the wall portion of the outer shell as an end cap for sealing the opening of the shell, a battery cell employing this structure facilitates installation of a one-way valve and a shielding member on the end cap, thereby reducing the difficulty of assembling the battery cell and improving the production efficiency of the battery cell. Similarly, by configuring the wall portion of the outer shell as a wall of the shell, a battery cell employing this structure can reduce the impact of stress generated when the end cap and shell are connected to each other on the one-way valve and the shielding member, thereby alleviating damage to the one-way valve or failure of the shielding member connection, thereby improving the stability and service life of the battery cell.

[0062] In a second aspect, an embodiment of the present application further provides a battery comprising the above-mentioned battery cell.

[0063] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery cell, wherein the battery cell is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0065] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0066] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0067] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0068] FIG4 is an exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0069] FIG5 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0070] FIG6 is a schematic structural diagram of a one-way valve provided in some embodiments of the present application;

[0071] FIG7 is a top view of a battery cell provided in some embodiments of the present application;

[0072] FIG8 is a partial enlarged view of the battery cell at point A shown in FIG7 ;

[0073] FIG9 is a schematic structural diagram of a shielding member provided in some embodiments of the present application;

[0074] FIG10 is a schematic structural diagram of shielding members provided in some other embodiments of the present application;

[0075] FIG11 is a schematic structural diagram of a shielding member provided in some further embodiments of the present application;

[0076] FIG12 is a bottom view of a shielding member provided in some embodiments of the present application;

[0077] FIG13 is an exploded view of a one-way valve according to some embodiments of the present application;

[0078] FIG14 is a cross-sectional view of a one-way valve provided in some embodiments of the present application;

[0079] FIG15 is a partial cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0080] FIG16 is a partial cross-sectional view of a wall portion of a housing of a battery cell provided in some embodiments of the present application;

[0081] FIG17 is a partial cross-sectional view of an insulating member provided in some embodiments of the present application.

[0082] Icons: 1000-vehicle; 100-battery; 10-box; 11-first box body; 12-second box body; 20-battery cell; 21-housing; 211-wall; 2111-mounting hole; 2111a-first hole section; 2111b-second hole section; 2112-first surface; 2113-mounting groove; 2113a-second corner surface; 2113b-second side surface; 212-housing; 2121-opening; 213-end cover; 22-electrode assembly; 221-ear; 23-one-way valve; 231-air outlet; 232-valve body; 2321-mounting cavity; 2322-air inlet; 2323-valve body; 2323a-sink; 2323b-connecting portion; 2323c-stress relief groove; 2324-valve cover; 2324a-second A guide post; 233-elastic member; 234-sealing member; 2341-second guide post; 2342-pressing portion; 2342a-clamping groove; 2343-sealing portion; 2343a-clamping portion; 24-shielding member; 241-first corner surface; 242-first side surface; 243-groove; 244-convex portion; 245-second surface; 2451-first groove; 2452-second groove; 246-third surface; 25-exhaust channel; 251-first exhaust gap; 252-second exhaust gap; 26-electrode terminal; 27-pressure relief mechanism; 28-insulating member; 281-main body; 282-accommodating portion; 2821-second through hole; 2822-first wall; 2823-second wall; 200-controller; 300-motor; X-thickness direction of the wall. DETAILED DESCRIPTION

[0083] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0084] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0085] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0086] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0087] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0088] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0089] The term "plurality" used in this application refers to two or more (including two).

[0090] 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.

[0091] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0092] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0093] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0094] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0095] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0096] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and at least one of its modified compounds, etc.

[0097] In some embodiments, a positive electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, among others. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0098] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0099] As an example, the negative electrode current collector can be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium can be used. The metal foam can be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0100] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0101] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0102] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0103] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0104] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0105] In some embodiments, the separator is a separator membrane. There are many types of separator membranes, and any known separator membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0106] As an example, the separator can be made of at least one of fiberglass, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator can be a single-layer film or a multi-layer composite film. In the case of a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0107] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0108] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0109] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium bisoxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0110] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0111] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0112] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0113] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, or the like.

[0114] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0115] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0116] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0117] In some embodiments, the electrode assembly is a laminate structure.

[0118] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0119] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0120] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0121] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0122] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0123] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0124] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0125] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0126] As an example, the battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include but are not limited to square-shell, blade-shaped, and polygonal batteries, such as hexagonal batteries.

[0127] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0128] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0129] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0130] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0131] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0132] Batteries, with their outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient, are a vital component of today's new energy development. The development of battery technology requires simultaneous consideration of multiple design factors, including performance parameters such as energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, battery safety must be considered. With the rapid development and increasing demand for batteries, demands for battery life and reliability are also increasing.

[0133] In battery technology, for typical battery cells, to ensure their safety, a pressure relief mechanism is typically installed on their outer casing. This mechanism releases internal pressure within the battery cell, effectively improving its safety. In related art, during use, a battery cell generates a certain amount of gas, which increases the pressure within the outer casing. This can cause the pressure relief mechanism to prematurely activate and release pressure, resulting in poor stability and a negative impact on the battery cell's lifespan and reliability.

[0134] Based on the above considerations, in order to solve the problems of short service life and low reliability of battery cells, an embodiment of the present application provides a battery cell, which includes a shell, an electrode assembly, a one-way valve and a shielding member. The shell has a wall portion, the electrode assembly is accommodated in the shell, the one-way valve is arranged on the wall portion, and the one-way valve has an air outlet, which is used to discharge the gas inside the shell. The shielding member is installed on the wall portion, and along the thickness direction of the wall portion, the shielding member is located on the side of the one-way valve away from the electrode assembly, and the shielding member covers the one-way valve, and an exhaust channel is formed between the shielding member and the wall portion, and the exhaust channel connects the air outlet and the outside of the shell.

[0135] In a battery cell of this structure, a one-way valve is provided on the wall of the shell so that the one-way valve can be opened in one direction and discharge the gas inside the shell to the outside of the shell. Therefore, when gas is generated inside the shell during normal use of the battery cell, it can be discharged to the outside of the shell through the one-way valve, thereby alleviating the phenomenon that the internal pressure of the battery cell reaches the threshold value prematurely due to the increase in the internal gas pressure of the battery cell, causing the battery cell to actuate and release pressure prematurely, thereby effectively improving the use stability of the battery cell, thereby improving the service life and reliability of the battery cell.

[0136] In addition, by providing a shielding member on the side of the one-way valve away from the electrode assembly, and the shielding member covers the one-way valve, the shielding member can play a certain protective and shielding role on the one-way valve. On the one hand, it can reduce the wear or damage of the one-way valve in the external environment, and can reduce the risk of impurities or particulate matter in the external environment entering the one-way valve, which is beneficial to improving the service life of the one-way valve. On the other hand, covering the one-way valve by the shielding member can improve the aesthetics of the outer surface of the battery cell. On the other hand, it is convenient to connect other components such as the detection element on the side of the shielding member away from the one-way valve, so as to reduce the interference of the area where the one-way valve is provided on the wall on the connection detection element and other components.

[0137] The battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft, and can also be used in energy storage devices. A power supply system comprising the battery cells and batteries disclosed in this application can be used to construct such electrical devices. This helps mitigate the problem of premature valve opening and pressure relief during battery cell use, thereby increasing the battery cell's service life and reliability.

[0138] The present invention provides an electric device that uses a battery as a power source. 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-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0139] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0140] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0141] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0142] Please refer to Figure 2, which is an exploded view of the structure of a battery 100 provided in some embodiments of the present application. The battery 100 may include a housing 10 and a battery cell 20, wherein the battery cell 20 is configured to be accommodated in the housing 10.

[0143] The housing 10 is used to provide assembly space for the battery cells 20 and can have various structures. In some embodiments, the housing 10 can include a first housing body 11 and a second housing body 12. The first housing body 11 and the second housing body 12 overlap each other, and together, the first housing body 11 and the second housing body 12 define an assembly space for accommodating the battery cells 20. The second housing body 12 can be a hollow structure with one end open. The first housing body 11 can be a plate-like structure, and the first housing body 11 overlaps the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 jointly define an assembly space. In other embodiments, the first housing body 11 and the second housing body 12 can also be hollow structures with one end open, with the open side of the first housing body 11 overlapping the open side of the second housing body 12. Of course, the housing 10 formed by the first housing body 11 and the second housing body 12 can have various shapes, such as a cylinder or a rectangular parallelepiped. For example, in Figure 2, the housing 10 is in the shape of a rectangular parallelepiped.

[0144] Optionally, in the battery 100, the battery cell 20 housed in the housing 10 may be one or more. When there are multiple battery cells 20 housed in the housing 10, the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire module formed by the multiple battery cells 20 may be housed in the housing 10. Of course, in some embodiments, the battery 100 may also be a battery module formed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection, and then the multiple battery modules may be connected in series, in parallel, or in a hybrid connection to form an entire module, which is then housed in the housing 10.

[0145] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component disposed in the housing 10 , and the busbar component connects the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0146] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be cylindrical, flat, rectangular, or in other shapes. For example, in FIG2 , the battery cell 20 is a rectangular parallelepiped.

[0147] According to some embodiments of the present application, referring to Figures 3, 4, 5 and 6, Figure 3 is a schematic structural diagram of a battery cell 20 provided in some embodiments of the present application, Figure 4 is an exploded structural diagram of a battery cell 20 provided in some embodiments of the present application, Figure 5 is a partial cross-sectional view of a battery cell 20 provided in some embodiments of the present application, and Figure 6 is a schematic structural diagram of a one-way valve 23 provided in some embodiments of the present application. The present application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, a one-way valve 23 and a shielding member 24. The housing 21 has a wall portion 211, and the electrode assembly 22 is accommodated in the housing 21. The one-way valve 23 is provided on the wall portion 211, and the one-way valve 23 has an air outlet 231, which is used to discharge the gas inside the housing 21. The shielding member 24 is installed on the wall 211. Along the thickness direction X of the wall, the shielding member 24 is located on the side of the one-way valve 23 away from the electrode assembly 22, and the shielding member 24 covers the one-way valve 23. An exhaust channel 25 is formed between the shielding member 24 and the wall 211, and the exhaust channel 25 connects the air outlet 231 and the outside of the outer shell 21.

[0148] The housing 21 can also be used to contain an electrolyte, such as an electrolyte solution. The housing 21 can have various structural forms, such as a cylinder or a rectangular parallelepiped. Similarly, the housing 21 can be made of various materials, such as copper, iron, aluminum, steel, or an aluminum alloy.

[0149] In some embodiments, the housing 21 may include a shell 212 and an end cover 213. A accommodating cavity is formed inside the shell 212, and the accommodating cavity is used to accommodate the electrode assembly 22. The accommodating cavity has an opening 2121. That is, the shell 212 is a hollow structure with an opening 2121 at one end. The end cover 213 covers the opening 2121 of the shell 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0150] It should be noted that the wall portion 211 for mounting the one-way valve 23 can be the end cap 213 of the outer shell 21 or a wall of the housing 212 of the outer shell 21. For example, in FIG3 , the wall portion 211 is the end cap 213. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the wall portion 211 can also be the bottom wall of the housing 212 disposed opposite the end cap 213, or the side wall of the housing 212 and the end cap 213 adjacent to and connected to each other.

[0151] When assembling the battery cell 20 , the electrode assembly 22 may be placed into the housing 212 first, and the housing 212 may be filled with electrolyte. The end cap 213 may then be placed over the opening 2121 of the housing 212 to complete the assembly of the battery cell 20 .

[0152] The housing 212 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, or a prismatic structure. The shape of the housing 212 can be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a cylindrical structure, a cylindrical housing 212 can be selected; if the electrode assembly 22 has a rectangular parallelepiped structure, a rectangular parallelepiped housing 212 can be selected. Of course, the structure of the end cap 213 can also be various, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 3, the housing 212 has a rectangular parallelepiped structure.

[0153] Of course, it is understandable that the shell 21 is not limited to the above structure. The shell 21 may also be other structures. For example, the shell 21 may include a shell 212 and two end covers 213. The shell 212 is a hollow structure with openings 2121 on opposite sides. One end cover 213 corresponds to an opening 2121 of the shell 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte. That is, the shell 212 is formed with openings 2121 on opposite sides, and the two end covers 213 are respectively covered on both sides of the shell 212 to close the corresponding openings 2121.

[0154] It should be noted that the electrode assembly 22 is the component where electrochemical reactions occur in the battery cell 20. The structure of the electrode assembly 22 can be various. For example, the electrode assembly 22 can be a wound structure formed by winding the positive electrode sheet, the separator and the negative electrode sheet, or it can be a stacked structure formed by stacking the positive electrode sheet, the separator and the negative electrode sheet.

[0155] Exemplarily, the separator is an isolation membrane, and the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0156] Optionally, the number of electrode assemblies 22 housed within the housing 21 may be one or more. For example, in FIG3 , the housing 21 of the battery cell 20 is provided with two electrode assemblies 22, which are stacked along the thickness of the housing 21. In other embodiments, the number of electrode assemblies 22 housed within the housing 21 may be one, three, four, five, six, seven, or eight, etc.

[0157] It should be noted that the one-way valve 23 is provided on the wall portion 211. The one-way valve 23 is used to exhaust the gas inside the shell 21. That is, the one-way valve 23 can be opened in one direction to exhaust gas, so that the gas inside the shell 21 can be discharged to the outside of the shell 21 through the one-way valve 23. Optionally, the one-way valve 23 can be provided on the wall portion 211 in various structures. The one-way valve 23 can be welded to the wall portion 211, or the one-way valve 23 can be clamped to the wall portion 211, or the one-way valve 23 can be adhered to the wall portion 211. The outside of the shell 21 refers to the external environment of the battery cell 20.

[0158] For example, in Figure 5, a mounting hole 2111 is provided on the wall portion 211, and the mounting hole 2111 connects the interior of the shell 21 and the exterior of the shell 21. Part of the one-way valve 23 is assembled into the mounting hole 2111 and extends to the interior of the shell 21 along the thickness direction X of the wall portion. The one-way valve 23 is sealed with the hole wall surface of the mounting hole 2111.

[0159] The shielding member 24 is mounted on the wall portion 211. Along the thickness direction X of the wall portion, the shielding member 24 is located on the side of the one-way valve 23 that is away from the electrode assembly 22. That is, the shielding member 24 and the one-way valve 23 are arranged along the thickness direction X of the wall portion, and the shielding member 24 is farther away from the electrode assembly 22 than the one-way valve 23. Optionally, the shielding member 24 can be mounted on the wall portion 211 in various structures. For example, the shielding member 24 can be mounted on the wall portion 211 by welding, interference fit, bolt connection, clamping, or bonding.

[0160] The shielding member 24 covers the one-way valve 23 , that is, the projection of the one-way valve 23 in the thickness direction X of the wall is located inside the shielding member 24 .

[0161] An exhaust channel 25 is formed between the shielding member 24 and the wall portion 211, and the exhaust channel 25 connects the air outlet 231 and the outside of the shell 21, that is, the shielding member 24 and the wall portion 211 jointly define the exhaust channel 25 connecting the air outlet 231 of the one-way valve 23 and the outside of the shell 21, so that the gas discharged from the inside of the shell 21 through the air outlet 231 by the one-way valve 23 can enter the exhaust channel 25 and be discharged to the outside of the shell 21.

[0162] For example, the shielding member 24 may be made of copper, iron, aluminum, steel, or aluminum alloy.

[0163] In some embodiments, the battery cell 20 may further include an electrode terminal 26 . The electrode terminal 26 is insulated and mounted on the housing 21 . The electrode terminal 26 is electrically connected to the electrode assembly 22 to output or input electrical energy of the battery cell 20 .

[0164] It should be noted that the electrode terminal 26 is insulated and mounted on the housing 21 , that is, no electrical connection is formed between the electrode terminal 26 and the housing 21 .

[0165] In FIG3 , the battery cell 20 includes two electrode terminals 26 . Correspondingly, each electrode assembly 22 has two tabs 221 , with the two tabs 221 having opposite polarities. The two electrode terminals 26 are electrically connected to the two tabs 221 of the electrode assembly 22 , respectively, to enable input or output of the positive and negative electrodes of the battery cell 20 . It should be noted that the tabs 221 of the electrode assembly 22 are formed by stacking and connecting the regions of the positive electrode sheet not coated with the positive electrode active material layer, or by stacking and connecting the regions of the negative electrode sheet not coated with the negative electrode active material layer. If the tabs 221 are used to output the positive electrode of the electrode assembly 22 , then the tabs 221 are formed by stacking and connecting the regions of the positive electrode sheet not coated with the positive electrode active material layer. If the tabs 221 are used to output the negative electrode of the electrode assembly 22 , then the tabs 221 are formed by stacking and connecting the regions of the negative electrode sheet not coated with the negative electrode active material layer.

[0166] Exemplarily, the electrode terminal 26 may be made of a variety of materials. For example, the electrode terminal 26 may be made of copper, iron, aluminum, steel, or aluminum alloy.

[0167] The electrode terminals 26 may be mounted on the outer shell 21 in various structures. For example, in FIG3 , both electrode terminals 26 are mounted on the end cap 213 of the outer shell 21. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, both electrode terminals 26 may be mounted on the shell 212 of the outer shell 21. Similarly, one electrode terminal 26 may be mounted on the shell 212 of the outer shell 21, and the other electrode terminal 26 may be mounted on the end cap 213 of the outer shell 21.

[0168] In some embodiments, the battery cell 20 may further include a pressure relief mechanism 27, which is mounted on the housing 21. Optionally, the pressure relief mechanism 27 may be disposed on the end cap 213 of the housing 21 or on the shell 212 of the housing 21. The pressure relief mechanism 27 is configured to relieve pressure within the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0169] For example, in FIG3 , the pressure relief mechanism 27 is provided on the end cover 213 of the housing 21 . The pressure relief mechanism 27 may be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, a pressure relief valve or a safety valve.

[0170] By arranging a one-way valve 23 on the wall 211 of the outer shell 21, the one-way valve 23 can be opened in one direction and discharge the gas inside the outer shell 21 to the outside of the outer shell 21, so that when gas is generated inside the outer shell 21 during normal use of the battery cell 20, it can be discharged to the outside of the outer shell 21 through the one-way valve 23, so as to alleviate the phenomenon that the internal pressure of the battery cell 20 reaches the threshold value in advance due to the increase in the internal air pressure of the battery cell 20, thereby causing the battery cell 20 to be actuated and depressurized in advance, thereby effectively improving the use stability of the battery cell 20, thereby improving the service life and reliability of the battery cell 20. In addition, by providing a shielding member 24 on the side of the one-way valve 23 away from the electrode assembly 22, and the shielding member 24 covers the one-way valve 23, the shielding member 24 can play a certain protective and shielding role on the one-way valve 23. On the one hand, it can reduce the wear or damage of the one-way valve 23 in the external environment, and can reduce the risk of impurities or particulate matter in the external environment entering the one-way valve 23, which is beneficial to improving the service life of the one-way valve 23. On the other hand, covering the one-way valve 23 by the shielding member 24 can improve the aesthetics of the outer surface of the battery cell 20. On the other hand, it is convenient to connect other components such as the detection element on the side of the shielding member 24 away from the one-way valve 23, so as to reduce the interference effect of the area where the one-way valve 23 is provided on the wall 211 on the connection detection element and other components.

[0171] According to some embodiments of the present application, referring to Figures 3, 4 and 5, along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2112 facing away from the electrode assembly 22, the first surface 2112 is provided with a mounting groove 2113, the bottom surface of the mounting groove 2113 is provided with a mounting hole 2111, at least a portion of the one-way valve 23 is provided in the mounting hole 2111, and at least a portion of the shielding member 24 is accommodated in the mounting groove 2113.

[0172] The first surface 2112 is provided with a mounting groove 2113 , and the bottom surface of the mounting groove 2113 is provided with a mounting hole 2111 , that is, the mounting hole 2111 passes through the bottom surface of the mounting groove 2113 , so that the mounting hole 2111 is connected to the outside of the shell 21 through the mounting groove 2113 .

[0173] At least part of the shielding member 24 is accommodated in the mounting groove 2113 , that is, the shielding member 24 may be entirely located in the mounting groove 2113 , or only partially located in the mounting groove 2113 . For example, in FIG. 5 , the shielding member 24 is entirely located in the mounting groove 2113 .

[0174] By providing a mounting groove 2113 on the first surface 2112 of the wall portion 211 away from the electrode assembly 22, and at least partially accommodating the shielding member 24 in the mounting groove 2113, on the one hand, the space occupied by the shielding member 24 and the wall portion 211 in the thickness direction X of the wall portion can be reduced, which is beneficial to optimizing the volume of the battery cell 20. On the other hand, the mounting groove 2113 can play a certain positioning and limiting role for the shielding member 24, which is beneficial to reducing the difficulty of assembling the shielding member 24 connected to the wall portion 211.

[0175] According to some embodiments of the present application, referring to Figures 4 and 5, and further referring to Figures 7 and 8, Figure 7 is a top view of a battery cell 20 provided in some embodiments of the present application, and Figure 8 is a partial enlarged view of a portion A of the battery cell 20 shown in Figure 7. The exhaust channel 25 may include a first exhaust gap 251 formed between the shielding member 24 and the side surface of the mounting groove 2113. The first exhaust gap 251 is used to connect the air outlet 231 and the outside of the housing 21.

[0176] Among them, the first exhaust gap 251 plays a role in connecting the air outlet 231 and the outside of the shell 21. The first exhaust gap 251 can be directly connected to the air outlet 231. For example, at least part of the projection of the first exhaust gap 251 in the thickness direction X of the wall is located in the mounting hole 2111, so that the air outlet 231 of the one-way valve 23 arranged in the mounting hole 2111 can be directly connected to the first exhaust gap 251. Of course, the first exhaust gap 251 can also be indirectly connected to the air outlet 231. For example, in Figure 5, the exhaust channel 25 can also include a second exhaust gap 252. The second exhaust gap 252 is formed between the shielding member 24 and the bottom surface of the mounting groove 2113. The second exhaust gap 252 connects the first exhaust gap 251 and the air outlet 231 of the one-way valve 23.

[0177] By forming a first exhaust gap 251 that is connected to the outside of the shell 21 between the covering member 24 and the side surface of the installation groove 2113, the gas discharged from the one-way valve 23 can be discharged to the outside of the shell 21 through the first exhaust gap 251. The battery cell 20 using this structure does not need to have a channel opened on the covering member 24, which is beneficial to reduce the processing difficulty and can improve the appearance of the battery cell 20.

[0178] It should be noted that the structure of the first exhaust gap 251 formed between the shielding member 24 and the groove side of the mounting groove 2113 can be various. According to some embodiments of the present application, refer to Figures 7 and 8, and further refer to Figure 9, which is a schematic structural diagram of the shielding member 24 provided in some embodiments of the present application. The outer peripheral surface of the shielding member 24 includes a first corner surface 241 and at least two first side surfaces 242, and the first corner surface 241 connects the two adjacent first side surfaces 242. The groove side surface of the mounting groove 2113 includes a second corner surface 2113a and at least two second side surfaces 2113b, and the second corner surface 2113a connects the two adjacent second side surfaces 2113b. Each second side surface 2113b is connected to a first side surface 242, and a first exhaust gap 251 is formed between the second corner surface 2113a and the first corner surface 241.

[0179] Among them, the first corner surface 241 connects the two adjacent first side surfaces 242, that is, in the circumferential direction of the shielding member 24, the first corner surface 241 is located between the two first side surfaces 242 and connects the two first side surfaces 242, that is, the first corner surface 241 is the surface at the corner of the outer peripheral surface of the shielding member 24.

[0180] The second corner surface 2113a connects the two adjacent second side surfaces 2113b, that is, in the circumferential direction of the mounting groove 2113, the second corner surface 2113a is located between the two second side surfaces 2113b and connects the two second side surfaces 2113b, that is, the second corner surface 2113a is the surface at the corner of the groove side surface of the mounting groove 2113.

[0181] Each first side surface 242 of the shielding member 24 abuts against and is connected to the corresponding second side surface 2113b in the groove side surface of the mounting groove 2113, so that the first corner surface 241 of the shielding member 24 faces the second corner surface 2113a in the groove side surface of the mounting groove 2113, so that a first exhaust gap 251 is formed between the first corner surface 241 and the second corner surface 2113a.

[0182] Optionally, the connection structure between the first side surface 242 and the second side surface 2113b can be various, such as welding, bonding or interference fit.

[0183] For example, in Figures 7 and 8, the shielding member 24 and the mounting groove 2113 are both rectangular structures, so that four first corner surfaces 241 are formed at the four corners of the shielding member 24, and correspondingly, four second corner surfaces 2113a are formed at the four corners of the groove side of the mounting groove 2113, so that four first exhaust gaps 251 are formed between the shielding member 24 and the groove side of the mounting groove 2113.

[0184] The two adjacent first side surfaces 242 in the outer peripheral surface of the shielding member 24 are connected by a first corner surface 241, and the two connected second side surfaces 2113b in the groove side surface of the mounting groove 2113 are connected by a second corner surface 2113a. Each first side surface 242 is connected to a second side surface 2113b, and a first gap is formed between the first corner surface 241 and the second corner surface 2113a. That is to say, a first exhaust gap 251 is formed at the corner of the shielding member 24 and the mounting groove 2113. On the one hand, it is convenient to form the first exhaust gap 251 between the outer peripheral surface of the shielding member 24 and the groove side surface of the mounting groove 2113. The structure is simple and easy to implement. On the other hand, while realizing the formation of the first exhaust gap 251 between the outer peripheral surface of the shielding member 24 and the groove side surface of the mounting groove 2113, it is beneficial to increase the connection area between the outer peripheral surface of the shielding member 24 and the groove side surface of the mounting groove 2113, which is beneficial to improve the firmness of the shielding member 24 connected to the wall portion 211.

[0185] In some embodiments, referring to FIG. 7 , FIG. 8 and FIG. 9 , the first corner surface 241 and the second corner surface 2113 a are both arc surfaces, and the radius of the first corner surface 241 is greater than the radius of the second corner surface 2113 a .

[0186] The first corner surface 241 and the second corner surface 2113a are both arcuate surfaces, that is, the first corner surface 241 is a surface formed at the rounded corner of the outer peripheral surface of the shielding member 24, and similarly, the second corner surface 2113a is a surface formed at the rounded corner of the side surface of the mounting groove 2113. Of course, in other embodiments, the first corner surface 241 may also be a surface formed at the chamfered corner of the outer peripheral surface of the shielding member 24, and the second corner surface 2113a may also be a surface formed at the chamfered corner of the side surface of the mounting groove 2113.

[0187] The radius of the first corner surface 241 is greater than the radius of the second corner surface 2113 a , that is, the diameter of the rounded corner of the outer peripheral surface of the shielding member 24 is greater than the diameter of the rounded corner of the groove side surface of the installation groove 2113 .

[0188] By setting the first corner surface 241 and the second corner surface 2113a as arc surfaces, and the radius of the first corner surface 241 is larger than the radius of the second corner surface 2113a, a first exhaust gap 251 is formed between the first corner surface 241 and the second corner surface 2113a, which has a simple structure and is easy to manufacture and process.

[0189] In some embodiments, the first side surface 242 is connected to the second side surface 2113b by welding.

[0190] By setting the first side surface 242 and the second side surface 2113b as a mutually welded structure, it is helpful to improve the connection firmness between the shielding member 24 and the groove side surface of the installation groove 2113, thereby improving the structural stability of the shielding member 24 assembled to the wall portion 211.

[0191] In some embodiments, please continue to refer to Figures 7, 8 and 9, the cross-section of the shielding member 24 in the thickness direction X perpendicular to the wall is rectangular, and the outer peripheral surface of the shielding member 24 includes four first side surfaces 242 and four first corner surfaces 241, and a first exhaust gap 251 is formed at at least one first corner surface 241.

[0192] Among them, the cross-section of the shielding member 24 in the thickness direction X perpendicular to the wall is rectangular, that is, the shielding member 24 is a rectangular structure. Correspondingly, the shape of the installation groove 2113 fits with the shielding member 24, and the installation groove 2113 is also a rectangular structure.

[0193] A first exhaust gap 251 is formed at at least one first corner surface 241, that is, among the four first corner surfaces 241 of the shielding member 24, only one first corner surface 241 may have a first exhaust gap 251 formed thereat, or two, three or four first corner surfaces 241 may have a first exhaust gap 251 formed thereat.

[0194] It should be noted that, in other embodiments, the cross-section of the shielding member 24 in the direction X perpendicular to the thickness of the wall portion may also be a triangle, a pentagon, a hexagon, a trapezoid, or the like.

[0195] By configuring the shielding member 24 as a rectangular plate structure, the four sides of the shielding member 24 form four first side surfaces 242 , and four first corner surfaces 241 are formed at the four right angles of the shielding member 24 , which simplifies the structure and facilitates manufacturing.

[0196] According to some embodiments of the present application, the first air vent gap 251 formed between the shielding member 24 and the side surface of the mounting groove 2113 can also have other structures. For example, referring to Figure 10, Figure 10 is a schematic structural diagram of the shielding member 24 provided in some other embodiments of the present application. The outer peripheral surface of the shielding member 24 is provided with a groove 243, and the first air vent gap 251 is formed between the bottom surface of the groove 243 and the side surface of the mounting groove 2113.

[0197] The outer circumferential surface of the shielding member 24 is used to connect with the side surface of the installation groove 2113 to enable the shielding member 24 to be installed in the installation groove 2113. By providing the groove 243 on the outer circumferential surface of the shielding member 24, a notch is formed in the shielding member 24 at the position where the groove 243 is provided. Therefore, the shielding member 24 at the position where the groove 243 is provided and the side surface of the installation groove 2113 jointly define a first exhaust gap 251.

[0198] Optionally, the connection structure between the outer peripheral surface of the shielding member 24 and the groove side surface of the installation groove 2113 can be various, such as welding or bonding.

[0199] Optionally, the number of grooves 243 provided on the outer circumferential surface of the shielding member 24 may be one or more. When multiple grooves 243 are provided on the outer circumferential surface of the shielding member 24 , the multiple grooves 243 are arranged at intervals along the circumference of the shielding member 24 .

[0200] For example, in Figure 10, the shielding member 24 is a rectangular structure, and grooves 243 are provided on two of the four straight sides of the shielding member 24. Of course, in other embodiments, the number of grooves 243 provided on the outer peripheral surface of the shielding member 24 can also be three, four or five, etc. Similarly, the shape of the shielding member 24 can also be triangular, trapezoidal or circular, etc.

[0201] By providing the groove 243 on the outer peripheral surface of the shielding member 24 , a first exhaust gap 251 for exhaust is formed between the groove bottom surface of the groove 243 and the groove side surface of the mounting groove 2113 , which has a simple structure and is easy to manufacture.

[0202] In some embodiments, the area of ​​the outer circumferential surface of the shielding member 24 where the groove 243 is not provided is welded to the groove side surface of the installation groove 2113 .

[0203] By welding the area on the outer peripheral surface of the shielding member 24 where the groove 243 is not provided to the groove side of the installation groove 2113, the shielding member 24 is connected to the groove side of the installation groove 2113. The battery cell 20 with this structure is beneficial to the firmness of the connection between the shielding member 24 and the wall portion 211, so as to improve the structural stability of the shielding member 24 assembled to the wall portion 211.

[0204] According to some embodiments of the present application, the first air venting gap 251 formed between the shielding member 24 and the side surface of the mounting groove 2113 may also have other structures. For example, referring to FIG11 , FIG11 is a schematic structural diagram of the shielding member 24 provided in some other embodiments of the present application. The outer circumferential surface of the shielding member 24 is provided with a plurality of protrusions 244, which are arranged at intervals along the circumference of the shielding member 24. The protrusions 244 abut against the side surface of the mounting groove 2113, and the first air venting gap 251 is formed between the area of ​​the outer circumferential surface of the shielding member 24 where the protrusions 244 are not provided and the side surface of the mounting groove 2113.

[0205] The protrusion 244 abuts against the groove side of the installation groove 2113 to form a cavity between two adjacent protrusions 244, so that the outer peripheral surface of the shielding member 24, the groove side of the installation groove 2113 and the two adjacent protrusions 244 jointly define a first exhaust gap 251.

[0206] Optionally, in this embodiment, the shielding member 24 can be assembled in various structures in the installation groove 2113. For example, the shielding member 24 can be assembled in the installation groove 2113 by interference fit between the abutment portion and the groove side of the installation groove 2113, welding or bonding, etc.

[0207] A plurality of protrusions 244 are convexly provided on the outer peripheral surface of the shielding member 24 and arranged at intervals along the circumference of the shielding member 24, and the protrusions 244 abut against the groove side of the mounting groove 2113, so that a first exhaust gap 251 for exhaust is formed between the area of ​​the outer peripheral surface of the shielding member 24 where no protrusions 244 are provided and the groove side of the mounting groove 2113. That is to say, the first exhaust gap 251 is located between two adjacent protrusions 244, has a simple structure, and is easy to assemble.

[0208] In some embodiments, the protrusion 244 is interference fit with the side surface of the mounting groove 2113 .

[0209] By interference fitting the protrusion 244 provided on the outer peripheral surface of the shielding member 24 with the side surface of the mounting groove 2113, the shielding member 24 is fixed in the mounting groove 2113. The battery cell 20 with this structure forms a first exhaust gap 251 between two adjacent protrusions 244 while facilitating the installation of the shielding member 24 on the wall portion 211, which helps to reduce the difficulty of assembling the shielding member 24.

[0210] It should be noted that, in some embodiments, the first exhaust gap 251 can also be other structures. For example, a breathable groove can be set on the side of the mounting groove 2113 to form a first exhaust gap 251 between the bottom surface of the breathable groove and the outer peripheral surface of the shielding member 24.

[0211] According to some embodiments of the present application, referring to FIG. 5 and further referring to FIG. 12 , which is a bottom view of a shielding member 24 provided in some embodiments of the present application, the exhaust passage 25 may further include a second exhaust gap 252 formed between the shielding member 24 and the bottom surface of the mounting groove 2113 . The second exhaust gap 252 connects the first exhaust gap 251 and the air outlet 231 .

[0212] In which, the second exhaust gap 252 is formed between the shielding member 24 and the bottom surface of the mounting groove 2113. The shielding member 24 and the bottom surface of the mounting groove 2113 can be arranged at intervals along the thickness direction X of the wall portion, so that the second exhaust gap 252 is formed between the surface of the shielding member 24 facing the bottom surface of the mounting groove 2113 and the bottom surface of the mounting groove 2113. Alternatively, a first groove 2451 is provided on the surface of the shielding member 24 facing the bottom surface of the mounting groove 2113, so that the second exhaust gap 252 is formed between the bottom surface of the first groove 2451 and the bottom surface of the mounting groove 2113.

[0213] It should be noted that in other embodiments, a first groove 2451 can be set on the bottom surface of the installation groove 2113 to form a second exhaust gap 252 between the bottom surface of the first groove 2451 and the surface of the shielding member 24 facing the bottom surface of the installation groove 2113.

[0214] The exhaust channel 25 also includes a second exhaust gap 252 formed between the covering member 24 and the bottom surface of the mounting groove 2113, and the second exhaust gap 252 connects the first exhaust gap 251 and the air outlet 231 to alleviate the phenomenon of exhaust obstruction between the air outlet 231 and the first exhaust gap 251 caused by the covering member 24 abutting against the bottom surface of the mounting groove 2113, thereby improving the smoothness of gas discharge from the air outlet 231 of the one-way valve 23 to the first exhaust gap 251.

[0215] In some embodiments, please continue to refer to Figures 5 and 12. Along the thickness direction X of the wall, the shielding member 24 has a second surface 245 facing the one-way valve 23, and the second surface 245 overlaps the bottom surface of the mounting groove 2113. The second surface 245 is provided with a first groove 2451, and a second exhaust gap 252 is formed between the bottom surface of the first groove 2451 and the bottom surface of the mounting groove 2113.

[0216] Among them, the second surface 245 overlaps the bottom surface of the installation groove 2113, that is, part of the second surface 245 and the bottom surface of the installation groove 2113 abut against each other, that is, along the thickness direction X of the wall, the shielding member 24 abuts against the bottom surface of the installation groove 2113.

[0217] A second exhaust gap 252 is formed between the bottom surface of the first groove 2451 and the bottom surface of the mounting groove 2113 . That is, the bottom surface of the first groove 2451 , the side surface of the first groove 2451 and the bottom surface of the mounting groove 2113 jointly define the second exhaust gap 252 .

[0218] By overlapping the second surface 245 of the shielding member 24 on the bottom surface of the mounting groove 2113, the shielding member 24 is abutted against the bottom surface of the mounting groove 2113, so as to improve the structural stability and reliability of the shielding member 24 installed in the mounting groove 2113. In addition, by setting a first groove 2451 on the second surface 245, a second exhaust gap 252 is formed between the bottom surface of the first groove 2451 and the bottom surface of the mounting groove 2113, so that the gas discharged from the air outlet 231 of the one-way valve 23 can enter the first exhaust gap 251 through the first groove 2451 and then be discharged to the outside of the shell 21, so that the shielding member 24 can be abutted against the bottom surface of the mounting groove 2113 and the first exhaust gap 251 and the air outlet 231 can be connected through the first groove 2451.

[0219] In some embodiments, referring to Figures 5, 7, 8 and 12, a plurality of first exhaust gaps 251 are formed between the shielding member 24 and the side surface of the mounting groove 2113, and the plurality of first exhaust gaps 251 are arranged at intervals along the circumference of the shielding member 24. A plurality of first grooves 2451 are provided on the second surface 245, and each first exhaust gap 251 is connected to a first groove 2451.

[0220] In the embodiment where the first venting gap 251 is formed between the first corner surface 241 and the second corner surface 2113a, as shown in FIG12 , the first groove 2451 extends radially of the shielding member 24 and penetrates the first corner surface 241, so that the second venting gap 252 formed between the bottom surface of the first groove 2451 and the bottom surface of the mounting groove 2113 can communicate with the first venting gap 251 formed between the first corner surface 241 and the second corner surface 2113a. Of course, in the embodiment where the first venting gap 251 is formed between the bottom surface of the groove 243 of the shielding member 24 and the side surface of the mounting groove 2113, the first groove 2451 penetrates the bottom surface of the groove 243. Similarly, in the embodiment where the first venting gap 251 is formed between the area of ​​the outer circumferential surface of the shielding member 24 where the protrusion 244 is not provided and the side surface of the mounting groove 2113, the first groove 2451 penetrates the area of ​​the outer circumferential surface of the shielding member 24 where the protrusion 244 is not provided.

[0221] For example, in Figure 12, the shielding member 24 has four first corner surfaces 241, and a first exhaust gap 251 is formed at each first corner surface 241. Correspondingly, four first grooves 2451 are provided on the second surface 245 of the shielding member 24, and each first groove 2451 passes through a first corner surface 241.

[0222] A plurality of first exhaust gaps 251 are formed between the shielding member 24 and the side surface of the mounting groove 2113 , and each first exhaust gap 251 is connected to a first groove 2451 , thereby facilitating further improvement of exhaust efficiency.

[0223] According to some embodiments of the present application, as shown in Figures 5 and 12, the second surface 245 is further provided with a second groove 2452, a plurality of first grooves 2451 are arranged around the second groove 2452 and are all connected to the second groove 2452, and the second groove 2452 is connected to the air outlet 231.

[0224] Exemplarily, four first grooves 2451 are provided on the second surface 245 of the shielding member 24, and the four first grooves 2451 are arranged at intervals along the circumference of the second groove 2452. The first grooves 2451 extend along the radial direction of the shielding member 24 and pass through the groove side of the second groove 2452, so that the first grooves 2451 can be connected with the air outlet 231 through the second grooves 2452, thereby enabling the second exhaust gap 252 to be connected with the air outlet 231 through the second grooves 2452.

[0225] By arranging a second groove 2452 on the second surface 245 of the shielding member 24 facing the one-way valve 23, the second groove 2452 is connected to the air outlet 231 of the one-way valve 23, and multiple first grooves 2451 are arranged around the second groove 2452 and are all connected to the second groove 2452, so that the gas discharged from the air outlet 231 of the one-way valve 23 can enter the second groove 2452 and then pass through the multiple first grooves 2451 and then pass through the corresponding first exhaust gaps 251 to be discharged to the outside of the shell 21, which is beneficial to improving the exhaust efficiency and can alleviate the phenomenon of gas accumulation between the shielding member 24 and the one-way valve 23.

[0226] In some embodiments, as shown in Figure 5, along the thickness direction X of the wall, the gas outlet 231 is arranged at the end of the one-way valve 23 away from the electrode assembly 22, the gas outlet 231 is arranged facing the second groove 2452, and the projection of the gas outlet 231 is located in the second groove 2452.

[0227] Illustratively, the entire projection of the one-way valve 23 in the thickness direction X of the wall is located within the second groove 2452 .

[0228] By arranging the air outlet 231 of the one-way valve 23 and the second groove 2452 to face each other, and the projection of the air outlet 231 in the thickness direction X of the wall is located in the second groove 2452, the second groove 2452 is a structure covering the air outlet 231 in the thickness direction X of the wall, so that the gas discharged from the air outlet 231 of the one-way valve 23 can directly enter the second groove 2452, which is beneficial to improving the exhaust smoothness and exhaust efficiency.

[0229] According to some embodiments of the present application, as shown in FIG. 5 , along the thickness direction X of the wall portion, the shielding member 24 does not extend beyond the first surface 2112 .

[0230] The shielding member 24 does not extend beyond the first surface 2112 , that is, the shielding member 24 does not extend out of the installation groove 2113 in the thickness direction X of the wall, so that the entire shielding member 24 is located in the installation groove 2113 .

[0231] By setting the shielding member 24 so as not to extend beyond the first surface 2112 of the wall 211 away from the electrode assembly 22 in the thickness direction X of the wall, the mounting groove 2113 can provide a certain degree of protection for the shielding member 24, thereby further reducing the wear of the shielding member 24.

[0232] In some embodiments, please continue to refer to FIG. 5 , the shielding member 24 has a third surface 246 facing away from the one-way valve 23 , and the third surface 246 is flush with the first surface 2112 .

[0233] By setting the third surface 246 of the shielding member 24 away from the one-way valve 23 and the first surface 2112 of the wall portion 211 away from the electrode assembly 22 to be flush with each other, it is beneficial to further improve the aesthetics of the outer surface of the battery cell 20, and it is convenient to set information codes or connect other components such as detection elements on the third surface 246 of the shielding member 24.

[0234] It should be noted that the information code can be a QR code, barcode, numbers or text, and the information of the battery cell 20 can be obtained by scanning or manually entering the information code. The detection element can include a circuit board and a sampling terminal electrically connected to the circuit board, and the sampling terminal includes a metal sheet (such as a nickel sheet), a temperature sensor, etc.

[0235] According to some embodiments of the present application, as shown in FIG. 5 , along the thickness direction X of the wall portion, the one-way valve 23 does not extend beyond the bottom surface of the installation groove 2113 .

[0236] The one-way valve 23 does not extend beyond the bottom surface of the mounting groove 2113 . That is, the one-way valve 23 is disposed in the mounting hole 2111 and does not extend into the mounting groove 2113 in the thickness direction X of the wall.

[0237] For example, in Figure 5, the end face of the one-way valve 23 facing away from the electrode assembly 22 in the thickness direction X of the wall is flush with the bottom surface of the mounting groove 2113, and the projection of the one-way valve 23 in the thickness direction X of the wall is located in the second groove 2452, so that the one-way valve 23 and the bottom surface of the second groove 2452 are structures arranged at intervals along the thickness direction X of the wall, and the end of the one-way valve 23 facing the electrode assembly 22 in the thickness direction X of the wall protrudes from the surface of the wall 211 facing the electrode assembly 22, so that part of the one-way valve 23 extends into the outer shell 21.

[0238] By setting the one-way valve 23 so as not to exceed the bottom surface of the mounting groove 2113 in the thickness direction X of the wall, that is, the one-way valve 23 set in the mounting hole 2111 does not extend into the mounting groove 2113, the interference between the one-way valve 23 and the covering member 24 set in the mounting groove 2113 can be reduced, and the one-way valve 23 is facilitated to exhaust.

[0239] According to some embodiments of the present application, the shielding member 24 is fixedly connected to the wall portion 211 .

[0240] Optionally, the shielding member 24 and the wall portion 211 may be fixedly connected in various structures. For example, the shielding member 24 may be connected to the wall portion 211 by welding, bonding, or interference fit.

[0241] By setting the shielding member 24 as a structure fixedly connected to the wall portion 211, the risk of the shielding member 24 detaching from the wall portion 211 during use is reduced, and the firmness of the connection between the shielding member 24 and the wall portion 211 can be improved, so as to facilitate setting information codes or connecting other components such as detection elements on the shielding member 24.

[0242] According to some embodiments of the present application, referring to Figures 5 and 6, and further referring to Figures 13 and 14, Figure 13 is an exploded view of the structure of the one-way valve 23 provided in some embodiments of the present application, and Figure 14 is a cross-sectional view of the one-way valve 23 provided in some embodiments of the present application. The one-way valve 23 may include a valve body 232, an elastic member 233, and a blocking member 234. The valve body 232 is disposed on the wall portion 211, and an installation cavity 2321 is formed inside the valve body 232. The valve body 232 is provided with an air inlet 2322 and an air outlet 231. The air inlet 2322 is used to connect the installation cavity 2321 with the interior of the housing 21, and the air outlet 231 is used to connect the installation cavity 2321 with the exhaust channel 25. The elastic member 233 is disposed in the installation cavity 2321. The blocking member 234 is movably disposed in the installation cavity 2321 . The blocking member 234 is used to block the air inlet 2322 under the action of the elastic member 233 , and is used to open the air inlet 2322 under the action of the gas inside the housing 21 .

[0243] Among them, the air inlet 2322 is used to connect the installation cavity 2321 and the interior of the shell 21, that is, the gas inside the shell 21 can enter the installation cavity 2321 through the air inlet 2322. Similarly, the air outlet 231 is used to connect the installation cavity 2321 and the exhaust channel 25, that is, the gas from the inside of the shell 21 entering the installation cavity 2321 can enter the exhaust channel 25 through the air outlet 231, and then be discharged to the outside of the shell 21 through the exhaust channel 25.

[0244] The blocking piece 234 is movably arranged in the installation cavity 2321, that is, the blocking piece 234 can move in the installation cavity 2321, so that the blocking piece 234 can block the air inlet 2322 when it moves closer to the air inlet 2322, and conversely, the air inlet 2322 can be opened when the blocking piece 234 moves away from the air inlet 2322.

[0245] The sealing member 234 is used to seal the air inlet 2322 under the action of the elastic member 233, and is used to open the air inlet 2322 under the action of the gas inside the shell 21. That is to say, the elastic member 233 can provide elastic force for the sealing member 234, so that the sealing member 234 can abut against the bottom surface of the installation cavity 2321 to seal the air inlet 2322. Conversely, when the force of the gas inside the shell 21 acting on the sealing member 234 is greater than the elastic force of the elastic member 233, the gas inside the shell 21 can overcome the elastic force of the elastic member 233 and push the sealing member 234 to separate from the bottom surface of the installation cavity 2321, so that the sealing member 234 opens the air inlet 2322, so that the gas inside the shell 21 can enter the installation cavity 2321 through the air inlet 2322 and then be discharged through the air outlet 231.

[0246] Optionally, the elastic member 233 is an elastic component, and its structure can be various, such as a spring, a spring, or elastic rubber. For example, in Figures 13 and 14, the elastic member 233 is a spring. Of course, in other embodiments, the elastic member 233 and the blocking member 234 can also be integrally formed into a single elastic component, such as elastic rubber.

[0247] It should be noted that the projection of the air outlet 231 in the thickness direction X of the wall can be located inside the spring or outside the spring. When there are multiple air outlets 231, the projections of the multiple air outlets 231 in the thickness direction X of the wall can be located inside the spring or around the outside of the spring. Of course, in some embodiments, they can be partially located inside the spring and partially located outside the spring.

[0248] The one-way valve 23 is provided with a valve body 232, an elastic member 233 and a blocking member 234. The valve body 232 is provided on the wall portion 211. The valve body 232 is provided with an air inlet 2322 communicating with the installation cavity 2321 and the interior of the housing 21, and an air outlet 231 connecting the installation cavity 2321 and the exhaust channel 25. By arranging the elastic member 233 and the blocking member 234 in the installation cavity 2321, the elastic member 233 can apply elastic force to the blocking member 234, so that The blocking member 234 can block the air inlet 2322 to prevent the gas outside the shell 21 from entering the interior of the shell 21, and when the pressure inside the shell 21 rises, the gas inside the shell 21 can act on the blocking member 234 and overcome the elastic force of the elastic member 233, so that the blocking member 234 can open the air inlet 2322, so that the gas inside the shell 21 can be discharged after the one-way opening of the one-way valve 23, thereby realizing the one-way exhaust function of the one-way valve 23.

[0249] According to some embodiments of the present application, as shown in Figures 5, 6, 13, and 14, the valve body 232 may include a valve body 2323 and a valve cover 2324. The valve body 2323 is disposed on the wall portion 211 and is provided with an air inlet 2322. Along the thickness direction X of the wall portion, the valve cover 2324 is disposed at an end of the valve body 2323 facing away from the electrode assembly 22. The valve cover 2324 and the valve body 2323 together enclose a mounting cavity 2321. The valve cover 2324 is provided with an air outlet 231.

[0250] In which, a mounting hole 2111 is provided on the wall portion 211, the valve body 2323 is installed in the mounting hole 2111, and the valve body 2323 extends into the outer shell 21 along the thickness direction X of the wall portion, that is, the valve body 2323 protrudes from the surface of the wall portion 211 facing the electrode assembly 22 along the thickness direction X of the wall portion.

[0251] The valve body 2323 may be installed on the wall portion 211 in various structures. For example, the valve body 2323 may be welded to the wall surface of the mounting hole 2111 or bonded to the wall surface of the mounting hole 2111 by a sealant.

[0252] Exemplarily, the air inlet 2322 is disposed at one end of the valve body 2323 in the wall thickness direction X, close to the electrode assembly 22. That is, the air inlet 2322 extends through the bottom surface of the mounting cavity 2321. Accordingly, the blocking member 234 is movably disposed within the mounting cavity 2321 along the wall thickness direction X, such that the blocking member 234 can block the air inlet 2322 when abutting against the bottom surface of the mounting cavity 2321. Of course, in other embodiments, the air inlet 2322 may also be disposed on a radial side of the valve body 2323. Accordingly, the blocking member 234 is movably disposed within the mounting cavity 2321 along the radial direction of the valve body 2323.

[0253] Exemplarily, the air outlet 231 is a first through hole provided on the valve cover 2324. The first through hole penetrates both sides of the valve cover 2324 along the thickness direction X of the wall. In FIG13 , the valve cover 2324 is provided with three air outlets 231, which are arranged around the central axis of the mounting hole 2111. Of course, in other embodiments, the number of air outlets 231 provided on the valve cover 2324 may be one, two, four, or five.

[0254] As an example, a plurality of air outlets 231 are provided on the valve cover 2324 , and the plurality of air outlets 231 are arranged at equal intervals.

[0255] As an example, the plurality of gas outlets 231 are arranged at equal intervals around the center of the valve cover 2324 , which allows the gas to flow out more smoothly.

[0256] In some embodiments, as shown in Figures 13 and 14, a valve cover 2324 is connected to the valve body 2323. A recessed groove 2323a is provided at the end of the valve body 2323 facing away from the electrode assembly 22, and at least a portion of the valve cover 2324 is accommodated within the recessed groove 2323a. By providing the recessed groove 2323a at the end of the valve body 2323 facing away from the electrode assembly 22, and by at least partially accommodating the valve cover 2324 within the recessed groove 2323a, the one-way valve 23 employing this structure can, on the one hand, reduce the space occupied by the valve body 232 in the thickness direction X of the wall portion, and on the other hand, improve the structural stability of the valve cover 2324 when assembled to the valve body 2323. The structure can also provide a certain degree of protection for the valve cover 2324, thereby reducing wear or damage to the valve cover 2324.

[0257] The installation cavity 2321 passes through the bottom surface of the groove 2323a, and the valve cover 2324 is assembled in the groove 2323a and abuts against the bottom surface of the groove 2323a, so that the valve cover 2324 and the valve body 2323 enclose the installation cavity 2321.

[0258] At least part of the valve cover 2324 is accommodated in the sink groove 2323a, that is, the valve cover 2324 may be located in the sink groove 2323a as a whole, or may be located partially in the sink groove 2323a. In other words, in the thickness direction X of the wall portion, the valve cover 2324 may extend out of the sink groove 2323a, or may not extend out of the sink groove 2323a. For example, in Figure 14, the valve cover 2324 is located in the sink groove 2323a as a whole.

[0259] For example, the valve body 2323 can be made of a metal material, such as copper, iron, aluminum, steel, or an aluminum alloy. Similarly, the valve cover 2324 can also be made of a metal material, such as copper, iron, aluminum, steel, or an aluminum alloy. The valve body 2323 and the valve cover 2324 can be made of the same material or different materials.

[0260] The valve body 232 of the one-way valve 23 includes a valve main body 2323 and a valve cover 2324. The valve cover 2324 is connected to the end of the valve main body 2323 that is away from the electrode assembly 22 in the thickness direction X of the wall, so that the valve cover 2324 and the valve main body 2323 jointly define an installation cavity 2321 for accommodating the elastic member 233 and the sealing member 234. The one-way valve 23 with this structure is configured to have the valve body 232 divided into two parts, thereby facilitating the assembly of the elastic member 233 and the sealing member 234 into the installation cavity 2321, which helps to reduce the difficulty of assembling the one-way valve 23.

[0261] According to some embodiments of the present application, referring to Figures 5, 13 and 14, the valve cover 2324 and the blocking member 234 are spaced apart along the thickness direction X of the wall portion, the two ends of the elastic member 233 are respectively against the valve cover 2324 and the blocking member 234, and the air inlet 2322 is arranged on the bottom surface of the installation cavity 2321.

[0262] Among them, the valve cover 2324 is arranged to face the bottom surface of the installation cavity 2321, and the two ends of the elastic member 233 in the thickness direction X of the wall are respectively abutted against the valve cover 2324 and the sealing member 234, so that the elastic member 233 is compressed between the valve cover 2324 and the sealing member 234, so that the elastic member 233 can provide elastic force for the sealing member 234, so that the sealing member 234 can seal the air inlet 2322 arranged on the bottom surface of the installation cavity 2321 under the action of the elastic force of the elastic member 233.

[0263] In some embodiments, as shown in FIG. 13 and FIG. 14 , a first guide post 2324 a is protruded from one side of the valve cover 2324 facing the blocking member 234 , and a portion of the elastic member 233 is sleeved on the outer side of the first guide post 2324 a . By protruding a first guide post 2324a on the side of the valve cover 2324 facing the sealing member 234, and partially sleeved on the outside of the first guide post 2324a, the one-way valve 23 with this structure can, on the one hand, play a certain positioning role for the elastic member 233 through the first guide post 2324a, so as to facilitate the assembly of the elastic member 233, which is conducive to reducing the difficulty of assembling the elastic member 233; on the other hand, the first guide post 2324a can play a certain guiding role when the elastic member 233 is compressed along the thickness direction X of the wall, so as to reduce the radial deformation of the elastic member 233 during the compression process, thereby achieving stable compression of the elastic member 233 along the thickness direction X of the wall, which is conducive to improving the reliability of the elastic member 233 and further reducing the risk of the sealing member 234 accidentally opening the air inlet 2322.

[0264] Among them, the elastic member 233 is a spring, part of which is sleeved on the outside of the first guide column 2324a, and the end of the spring away from the blocking member 234 abuts against the surface of the valve cover 2324 where the first guide column 2324a is protruding, that is, the first guide column 2324a is inserted into the spring.

[0265] Illustratively, the central axis of the first guide column 2324a coincides with the central axis of the mounting hole 2111 , and the central axis of the elastic member 233 coincides with the central axis of the first guide column 2324a .

[0266] It should be noted that in the embodiment where multiple air outlets 231 are provided on the valve cover 2324, the multiple air outlets 231 surround the outer side of the first guide column 2324a. Of course, in other embodiments, the air outlet 231 can also be a structure that penetrates the first guide column 2324a along the thickness direction X of the wall.

[0267] By arranging the valve cover 2324 and the blocking member 234 to be arranged at intervals along the thickness direction X of the wall, the two ends of the elastic member 233 can respectively abut against the valve cover 2324 and the blocking member 234, so that the blocking member 234 can block the air inlet 2322 arranged on the bottom surface of the installation cavity 2321 along the thickness direction X of the wall under the action of the elastic member 233. That is, the air inlet 2322 is arranged at one end of the valve body 2323 facing the electrode assembly 22 in the thickness direction X of the wall, and the blocking member 234 can move along the thickness direction X of the wall under the action of the elastic member 233 and block the air inlet 2322. The one-way valve 23 adopting this structure makes it convenient for the elastic member 233 to apply elastic force to the blocking member 234, so that the blocking member 234 blocks the air inlet 2322, and can reduce the difficulty of assembling the elastic member 233.

[0268] According to some embodiments of the present application, as shown in FIG. 14 , the diameter of the first guide column 2324 a is D1 , and the inner diameter of the elastic member 233 is D2 , satisfying 0 mm < D2 − D1 ≤ 5 mm.

[0269] The elastic member 233 is a spring, and the inner diameter D2 of the elastic member 233 is the diameter of the cavity formed inside the spring.

[0270] 0mm<D2-D1≤5mm, that is, when the first guide post 2324a and the elastic member 233 are coaxially arranged, the size of the gap between the first guide post 2324a and the elastic member 233 is greater than 0mm and less than or equal to 5mm.

[0271] Exemplarily, the difference between the inner diameter of the elastic member 233 and the diameter of the first guide column 2324a can be 0mm, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc.

[0272] By setting the difference between the inner diameter of the elastic part 233 and the diameter of the first guide column 2324a to be greater than 0 mm and less than or equal to 5 mm, on the one hand, the phenomenon that the elastic part 233 is not convenient to be assembled on the first guide column 2324a due to the difference between the inner diameter of the elastic part 233 and the diameter of the first guide column 2324a being less than or equal to 0 can be alleviated, thereby reducing the scratching phenomenon when the elastic part 233 is sleeved on the first guide column 2324a. On the other hand, the phenomenon that the gap between the elastic part 233 and the first guide column 2324a is too large due to the difference between the inner diameter of the elastic part 233 and the diameter of the first guide column 2324a is too large can be alleviated, thereby reducing the radial movement or radial deformation of the elastic part 233, thereby improving the balance of the elastic force of the elastic part 233 acting on the blocking part 234, thereby reducing the risk of the blocking part 234 accidentally opening the air inlet 2322.

[0273] In some embodiments, a first limiting groove may be further provided on a side of the valve cover 2324 facing the blocking member 234 , and an end of the elastic member 233 away from the blocking member 234 is inserted into the first limiting groove.

[0274] Among them, a first limiting groove is provided on the side of the valve cover 2324 facing the sealing member 234, that is, a first limiting groove is provided on the surface of the valve cover 2324 facing the sealing member 234 in the thickness direction X of the wall. In the embodiment in which a first guide column 2324a is protruding from the side of the valve cover 2324 facing the sealing member 234, the first limiting groove is provided on the surface of the valve cover 2324 on which the first guide column 2324a is protruding.

[0275] One end of the elastic member 233 away from the blocking member 234 is inserted into the first limiting groove, that is, the end of the elastic member 233 away from the blocking member 234 abuts against the bottom surface of the first limiting groove.

[0276] Exemplarily, the elastic member 233 is a spring, and correspondingly, the first limiting groove is an annular groove structure. In an embodiment in which a first guide column 2324a is protruding from the side of the valve cover 2324 facing the blocking member 234, the first limiting groove is arranged around the outer side of the first guide column 2324a.

[0277] The side of the valve cover 2324 facing the blocking member 234 is also provided with a first limiting groove for the elastic member 233 to be inserted, so as to limit the end of the elastic member 233 against the valve cover 2324, so as to reduce the relative radial slippage between the elastic member 233 and the valve cover 2324, thereby improving the balance of the elastic force of the elastic member 233 acting on the blocking member 234, which is beneficial to improving the reliability of the use of the elastic member 233.

[0278] In some embodiments, one end of the elastic member 233 away from the blocking member 234 is fixedly connected to the valve cover 2324 .

[0279] There are various structures for fixing the elastic member 233 and the valve cover 2324, such as welding or bonding.

[0280] It should be noted that, in an embodiment in which a first limiting groove is provided on the side of the valve cover 2324 facing the blocking member 234, and the end of the elastic member 233 away from the blocking member 234 is inserted into the first limiting groove, then the end of the elastic member 233 away from the blocking member 234 is fixedly connected to the bottom surface of the first limiting groove; in an embodiment in which the first limiting groove is not provided on the side of the valve cover 2324 facing the blocking member 234, then the end of the elastic member 233 away from the blocking member 234 is fixedly connected to the surface of the valve cover 2324 that abuts against each other.

[0281] By fixing one end of the elastic member 233 away from the blocking member 234 to the valve cover 2324, so that the end of the elastic member 233 resting on the valve cover 2324 and the valve cover 2324 are fixedly connected to each other, the stability of the elastic member 233 resting on the valve cover 2324 can be improved, so as to further reduce the relative slippage between the elastic member 233 and the valve cover 2324, and further improve the balance of the elastic force of the elastic member 233 acting on the blocking member 234.

[0282] It should be noted that the structure of the one-way valve 23 is not limited to this. In some embodiments, the one-way valve 23 may also have other structures. For example, referring to Figure 15, which is a partial cross-sectional view of a battery cell 20 provided in some other embodiments of the present application, along the thickness direction X of the wall, the mounting cavity 2321 extends through the end of the valve body 232 facing away from the electrode assembly 22 and forms an air outlet 231. The shielding member 24 is arranged facing the air outlet 231.

[0283] Among them, the installation cavity 2321 passes through the end of the valve body 232 away from the electrode assembly 22 and forms an air outlet 231, that is, in an embodiment where the valve body 232 includes a valve body 2323 and a valve cover 2324, the valve body 232 is not provided with a valve cover 2324 to form an installation cavity 2321 inside the valve body 2323, and the installation cavity 2321 passes through the end of the valve body 2323 away from the electrode assembly 22 along the thickness direction X of the wall to form the air outlet 231.

[0284] By setting the installation cavity 2321 to pass through the end of the valve body 232 away from the electrode assembly 22 in the thickness direction X of the wall, an air outlet 231 is formed at the end of the valve body 232 away from the electrode assembly 22, and the air outlet 231 is covered by the covering member 24. The one-way valve 23 with this structure facilitates the assembly of the elastic member 233 and the sealing member 234 into the installation cavity 2321 through the air inlet 2322, which helps to reduce the difficulty of assembling the one-way valve 23.

[0285] It should be noted that in an embodiment where the valve body 232 is not provided with a valve cover 2324, the air inlet 2322 may be provided on the side surface of the mounting cavity 2321, that is, the blocking member 234 and the elastic member 233 are arranged along the radial direction of the mounting cavity 2321, so that the blocking member 234 can block the air inlet 2322. Of course, the air inlet 2322 may also be provided on the bottom surface of the mounting cavity 2321, that is, the blocking member 234 and the elastic member 233 are arranged along the thickness direction X of the wall portion, so that the blocking member 234 can block the air inlet 2322. As shown in FIG15 , along the thickness direction X of the wall portion, the shielding member 24 and the blocking member 234 are spaced apart, the two ends of the elastic member 233 respectively abut against the shielding member 24 and the blocking member 234, and the air inlet 2322 is provided on the bottom surface of the mounting cavity 2321.

[0286] Among them, the shielding member 24 is arranged to face the bottom surface of the installation cavity 2321, and the two ends of the elastic member 233 in the thickness direction X of the wall are respectively abutted against the shielding member 24 and the blocking member 234, so that the elastic member 233 is compressed between the shielding member 24 and the blocking member 234, so that the elastic member 233 can provide elastic force for the blocking member 234, so that the blocking member 234 can block the air inlet 2322 set on the bottom surface of the installation cavity 2321 under the action of the elastic force of the elastic member 233.

[0287] It should be noted that in the embodiment where the second surface 245 of the shielding member 24 is provided with the second groove 2452 , one end of the elastic member 233 away from the blocking member 234 abuts against the bottom surface of the second groove 2452 .

[0288] By arranging the blocking member 24 and the blocking member 234 at intervals along the thickness direction X of the wall, the two ends of the elastic member 233 can respectively abut against the blocking member 24 and the blocking member 234, so that the blocking member 234 can block the air inlet 2322 arranged on the bottom surface of the installation cavity 2321 along the thickness direction X of the wall under the action of the elastic member 233. That is to say, the air inlet 2322 is arranged at one end of the valve body 2323 facing the electrode assembly 22 in the thickness direction X of the wall. The blocking member 234 can move along the thickness direction X of the wall under the action of the elastic member 233 and block the air inlet 2322. The one-way valve 23 with this structure makes it convenient for the elastic member 233 to apply elastic force to the blocking member 234, so that the blocking member 234 blocks the air inlet 2322, and can reduce the difficulty of assembling the elastic member 233.

[0289] In some embodiments, referring to Figures 5, 13, and 14, and further referring to Figure 16, Figure 16 is a partial cross-sectional view of the wall portion 211 of the outer shell 21 of the battery cell 20 provided in some embodiments of the present application. The wall portion 211 has a first surface 2112 facing away from the electrode assembly 22. The first surface 2112 is provided with a mounting groove 2113. The shielding member 24 is assembled into the mounting groove 2113. The bottom surface of the mounting groove 2113 is provided with a mounting hole 2111. The mounting hole 2111 communicates with the interior of the outer shell 21. The valve body 2323 is mounted in the mounting hole 2111 and protrudes from the surface of the wall portion 211 facing the electrode assembly 22 along the thickness direction X of the wall portion. The mounting hole 2111 includes a first hole segment 2111a and a second hole segment 2111b. The first hole segment 2111a and the second hole segment 2111b are arranged along the wall thickness direction X, with the first hole segment 2111a located on the side of the second hole segment 2111b facing away from the electrode assembly 22. The aperture of the first hole segment 2111a is larger than the aperture of the second hole segment 2111b. The valve body 2323 has a connecting portion 2323b located within the first hole segment 2111a. The connecting portion 2323b is an annular structure extending along the circumference of the valve body 2323. The connecting portion 2323b is welded to the hole wall surface of the first hole segment 2111a to form a weld mark of the annular structure.

[0290] Optionally, as shown in FIG14 , the connecting portion 2323b is further provided with a stress relief groove 2323c, which is an annular groove structure. In embodiments where the valve body 232 includes the valve main body 2323 and the valve cover 2324, the stress relief groove 2323c surrounds the outside of the valve cover 2324. In embodiments where the valve body 232 includes only the valve main body 2323, the stress relief groove 2323c surrounds the outside of the mounting cavity 2321. Providing the stress relief groove 2323c on the connecting portion 2323b allows the stress relief groove 2323c to relieve welding stress generated by welding the connecting portion 2323b to the hole wall of the first hole section 2111a. This reduces the impact of welding stress on the weld connecting the hole wall of the first hole section 2111a and the connecting portion 2323b, thereby reducing the risk of weld cracking and, consequently, the risk of seal failure at the weld.

[0291] According to some embodiments of the present application, as shown in Figures 13, 14 and 15, a second guide column 2341 is protruding from the side of the blocking member 234 facing the valve cover 2324 or the shielding member 24, and a portion of the elastic member 233 is sleeved on the outer side of the second guide column 2341.

[0292] Among them, the elastic member 233 is a spring, part of which is sleeved on the outside of the second guide column 2341, and one end of the spring away from the valve cover 2324 or the blocking member 24 abuts against the surface of the blocking member 234 on which the second guide column 2341 is protruding, that is, the second guide column 2341 is inserted into the spring.

[0293] Illustratively, the central axis of the second guide column 2341 coincides with the central axis of the mounting hole 2111 , and the central axis of the elastic member 233 coincides with the central axis of the second guide column 2341 .

[0294] By protruding a second guide column 2341 on the side of the sealing member 234 facing the valve cover 2324, and partially sleeved on the outside of the second guide column 2341, the one-way valve 23 with this structure can, on the one hand, play a certain positioning role for the elastic member 233 through the second guide column 2341, so as to facilitate the assembly of the elastic member 233, which is conducive to reducing the difficulty of assembling the elastic member 233; on the other hand, the second guide column 2341 can play a certain guiding role when the elastic member 233 is compressed along the thickness direction X of the wall, so as to reduce the radial deformation of the elastic member 233 during the compression process, thereby achieving stable compression of the elastic member 233 along the thickness direction X of the wall, which is conducive to improving the reliability of the elastic member 233 and further reducing the risk of the sealing member 234 accidentally opening the air inlet 2322.

[0295] According to some embodiments of the present application, as shown in FIG. 14 , the diameter of the second guide column 2341 is D3, and the inner diameter of the elastic member 233 is D2, satisfying 0 mm < D3 - D1 ≤ 5 mm.

[0296] The elastic member 233 is a spring, and the inner diameter D2 of the elastic member 233 is the diameter of the cavity formed inside the spring.

[0297] 0mm<D3-D1≤5mm, that is, when the second guide post 2341 and the elastic member 233 are coaxially arranged, the size of the gap between the second guide post 2341 and the elastic member 233 is greater than 0mm and less than or equal to 5mm.

[0298] Exemplarily, the difference between the inner diameter of the elastic member 233 and the diameter of the second guide post can be 0mm, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc.

[0299] By setting the difference between the inner diameter of the elastic part 233 and the diameter of the second guide column 2341 to be greater than 0 mm and less than or equal to 5 mm, on the one hand, it can alleviate the phenomenon that the elastic part 233 is not convenient to be assembled on the second guide column 2341 due to the difference between the inner diameter of the elastic part 233 and the diameter of the second guide column 2341 being less than or equal to 0, so as to reduce the scratching phenomenon when the elastic part 233 is sleeved on the second guide column 2341. On the other hand, it can alleviate the phenomenon that the gap between the elastic part 233 and the second guide column 2341 is too large due to the difference between the inner diameter of the elastic part 233 and the diameter of the second guide column 2341 being too large, so as to reduce the radial movement or radial deformation of the elastic part 233, thereby improving the balance of the elastic force of the elastic part 233 acting on the blocking part 234, so as to reduce the risk of the blocking part 234 accidentally opening the air inlet 2322.

[0300] In some embodiments, a second limiting groove may be further provided on the side of the blocking member 234 facing the valve cover 2324 , and an end of the elastic member 233 away from the valve cover 2324 is inserted into the second limiting groove.

[0301] Among them, a second limiting groove is provided on the side of the sealing member 234 facing the valve cover 2324, that is, a second limiting groove is provided on the surface of the sealing member 234 facing the valve cover 2324 in the thickness direction X of the wall. In the embodiment in which a second guide column 2341 is protruding from the side of the sealing member 234 facing the valve cover 2324, a second limiting groove is provided on the surface of the sealing member 234 on which the second guide column 2341 is protruding.

[0302] One end of the elastic member 233 away from the valve cover 2324 is inserted into the second limiting groove, that is, the end of the elastic member 233 away from the valve cover 2324 abuts against the bottom surface of the second limiting groove.

[0303] Exemplarily, the elastic member 233 is a spring, and correspondingly, the second limiting groove is an annular groove structure. In an embodiment in which a second guide column 2341 is protruding from the side of the sealing member 234 facing the valve cover 2324, the second limiting groove is arranged around the outer side of the second guide column 2341.

[0304] By providing a second limiting groove for the elastic member 233 to be inserted on the side of the sealing member 234 facing the valve cover 2324, a limiting effect can be exerted on the end of the elastic member 233 that is pressed against the sealing member 234, so as to reduce the relative radial slippage between the elastic member 233 and the sealing member 234, thereby improving the balance of the elastic force of the elastic member 233 acting on the sealing member 234, which is beneficial to improving the reliability of the use of the elastic member 233.

[0305] According to some embodiments of the present application, one end of the elastic member 233 away from the valve cover 2324 is fixedly connected to the blocking member 234 .

[0306] There are various structures for fixing the elastic member 233 and the blocking member 234 together, such as welding or bonding.

[0307] It should be noted that, in an embodiment in which a second limiting groove is provided on the side of the sealing member 234 facing the valve cover 2324, and the end of the elastic member 233 away from the valve cover 2324 is inserted into the second limiting groove, then the end of the elastic member 233 away from the valve cover 2324 is fixedly connected to the bottom surface of the second limiting groove; in an embodiment in which the second limiting groove is not provided on the side of the sealing member 234 facing the valve cover 2324, then the end of the elastic member 233 away from the valve cover 2324 is fixedly connected to the surface of the sealing member 234 that abuts against each other.

[0308] By fixing one end of the elastic member 233 away from the valve cover 2324 to the blocking member 234, so that the end of the elastic member 233 resting on the blocking member 234 and the blocking member 234 are fixedly connected to each other, the stability of the elastic member 233 resting on the blocking member 234 can be improved, so as to further reduce the relative slippage between the elastic member 233 and the blocking member 234, and further improve the balance of the elastic force of the elastic member 233 acting on the blocking member 234.

[0309] According to some embodiments of the present application, referring to Figures 13, 14 and 15, the blocking member 234 may include a pressing portion 2342 and a sealing portion 2343. Along the thickness direction X of the wall, both ends of the elastic member 233 respectively abut against the pressing portion 2342 and the valve cover 2324 or the shielding member 24. The sealing portion 2343 is connected to the side of the pressing portion 2342 facing away from the valve cover 2324 or the shielding member 24. The sealing portion 2343 is used to seal the air inlet 2322.

[0310] The elastic member 233 can provide an elastic force for the pressing portion 2342 so that the pressing portion 2342 can be pressed against the sealing portion 2343 , thereby sealing the air inlet 2322 through the sealing portion 2343 .

[0311] Optionally, the rigidity of the pressing portion 2342 is greater than that of the sealing portion 2343, that is, the deformation resistance of the pressing portion 2342 is greater than that of the sealing portion 2343. This allows the pressing portion 2342 to better press the sealing portion 2343 against the bottom surface of the mounting cavity 2321 to seal the air inlet 2322. For example, the pressing portion 2342 can be made of a variety of materials, such as steel, iron, or aluminum. Similarly, the sealing portion 2343 can also be made of a variety of materials, such as rubber, silicone, or plastic.

[0312] Optionally, the connection structure between the pressing portion 2342 and the sealing portion 2343 can be various, such as clamping, bolting, or bonding.

[0313] It should be noted that in the embodiment where the blocking member 234 is provided with a second guide post 2341, the second guide post 2341 is protruding from the surface of the pressing portion 2342 facing the valve cover 2324 or the shielding member 24. Similarly, in the embodiment where the blocking member 234 is provided with a second limiting groove on the side facing the valve cover 2324, the second limiting groove is provided on the surface of the pressing portion 2342 facing the valve cover 2324.

[0314] By setting the sealing member 234 to include a clamping portion 2342 and a sealing portion 2343, the clamping portion 2342 is set on the side of the sealing portion 2343 facing the valve cover 2324, and the sealing portion 2343 is used to seal the air inlet 2322, and the two ends of the elastic member 233 are respectively against the valve cover 2324 and the clamping portion 2342, so that the elastic member 233 can exert elastic force on the sealing portion 2343 through the clamping portion 2342, which is beneficial to improve the balance of the elastic force of the elastic member 233 acting on the sealing portion 2343, and thus can effectively improve the sealing effect of the sealing portion 2343 on the air inlet 2322.

[0315] According to some embodiments of the present application, as shown in Figures 13, 14, and 15, along the thickness direction X of the wall portion, the pressing portion 2342 has a snap-fit ​​groove 2342a provided on one side facing the sealing portion 2343, and the sealing portion 2343 has a snap-fit ​​portion 2343a protruding from the side facing the pressing portion 2342. The snap-fit ​​portion 2343a is inserted into the snap-fit ​​groove 2342a, and the snap-fit ​​portion 2343a snaps into engagement with the snap-fit ​​groove 2342a. The blocking member 234 with this structure can improve the structural stability of the sealing portion 2343 provided on the pressing portion 2342, thereby reducing the radial slippage of the sealing portion 2343 relative to the pressing portion 2342, thereby facilitating an improvement in the sealing effect of the sealing portion 2343 on the air inlet 2322, thereby reducing the phenomenon of the air inlet 2322 being accidentally opened.

[0316] Illustratively, the clamping portion 2343a is a circular columnar structure, and correspondingly, the clamping groove 2342a is a circular groove.

[0317] In some embodiments, the sealing portion 2343 is bonded to the pressing portion 2342. The use of a bonding structure to connect the sealing portion 2343 and the pressing portion 2342 can, on the one hand, improve the structural stability of the sealing portion 2343 connected to the pressing portion 2342, which helps to reduce the risk of the sealing portion 2343 and the pressing portion 2342 being separated from each other, thereby improving the reliability of the sealing portion 2343 in blocking the air inlet 2322. On the other hand, it facilitates the assembly connection between the sealing portion 2343 and the pressing portion 2342, which helps to reduce the difficulty of assembling the sealing portion 2343 and the pressing portion 2342.

[0318] In some embodiments, the material of the sealing portion 2343 includes EPDM, fluororubber, or Teflon. The sealing portion 2343 made of EPDM, fluororubber, or Teflon has good corrosion resistance, effectively alleviating electrolyte corrosion of the sealing portion 2343, thereby improving the service life of the sealing portion 2343 and reducing the ineffective sealing of the air inlet 2322 by the sealing portion 2343 due to corrosion.

[0319] It should be noted that, in some embodiments, the blocking member 234 may not be provided with the pressing portion 2342 , and the blocking member 234 only includes the sealing portion 2343 , and one end of the elastic member 233 directly abuts against the sealing portion 2343 .

[0320] According to some embodiments of the present application, as shown in FIG. 14 , along the thickness direction X of the wall, the size of the gap between the valve cover 2324 and the blocking member 234 is L, satisfying 0 mm < L ≤ 2 mm.

[0321] The size of the gap between the valve cover 2324 and the blocking member 234 is L, that is, the distance between the valve cover 2324 and the blocking member 234 in the thickness direction X of the wall is L.

[0322] Exemplarily, the size L of the gap between the valve cover 2324 and the sealing member 234 can be 0 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm or 2 mm, etc.

[0323] It should be noted that, in the embodiment in which the valve cover 2324 is protruding with a first guide column 2324a and the blocking member 234 is protruding with a second guide column 2341, L is the dimension of the gap formed between the first guide column 2324a and the second guide column 2341 in the thickness direction X of the wall; in the embodiment in which the valve cover 2324 is protruding with a first guide column 2324a and the blocking member 234 is not protruding with a second guide column 2341, L is the dimension of the gap formed between the first guide column 2324a and the surface of the blocking member 234 facing the valve cover 2324 in the thickness direction X of the wall; in the embodiment in which the valve cover 2324 is not protruding with the first guide column 2324a and the blocking member 234 is protruding with the second guide column 2341, L is the dimension of the gap formed between the second guide column 2341 and the surface of the valve cover 2324 facing the blocking member 234 in the thickness direction X of the wall.

[0324] By setting the size of the gap between the valve cover 2324 and the blocking member 234 in the thickness direction X of the wall to be greater than 0 mm and less than or equal to 2 mm, on the one hand, the obstruction of the valve cover 2324 on the blocking member 234 can be reduced, so that there is space between the valve cover 2324 and the blocking member 234 for the blocking member 234 to move along the thickness direction X of the wall, so that when the gas inside the shell 21 pushes the blocking member 234, the blocking member 234 can open the air inlet 2322 for exhaust. On the other hand, it can alleviate the phenomenon that the one-way valve 23 occupies too much space in the thickness direction X of the wall due to the excessive gap between the valve cover 2324 and the blocking member 234, which is beneficial to improving the space utilization rate of the battery cell 20.

[0325] In some embodiments, referring to Figures 4 and 5, and further referring to Figure 17, Figure 17 is a partial cross-sectional view of an insulating member 28 provided in some embodiments of the present application. The battery cell 20 may further include an insulating member 28, which is provided on the side of the wall portion 211 facing the electrode assembly 22. Along the thickness direction X of the wall portion, the valve body 232 of the one-way valve 23 protrudes from the surface of the wall portion 211 facing the electrode assembly 22. The insulating member 28 includes a main body portion 281 and a receiving portion 282. The main body portion 281 is provided on the side of the wall portion 211 facing the electrode assembly 22, and the receiving portion 282 is connected to the main body portion 281. The portion of the valve body 232 of the one-way valve 23 that protrudes from the surface of the wall portion 211 facing the electrode assembly 22 is received in the receiving portion 282.

[0326] The insulating member 28 is disposed on a side of the wall portion 211 facing the electrode assembly 22 . The insulating member 28 serves to separate the wall portion 211 and the electrode assembly 22 to insulate and isolate the wall portion 211 and the electrode assembly 22 .

[0327] For example, the insulating member 28 can be made of various materials, such as rubber, silicone, or plastic.

[0328] The portion of the valve body 232 of the one-way valve 23 that protrudes from the surface of the wall portion 211 facing the electrode assembly 22 is accommodated in the accommodating portion 282, that is, the accommodating portion 282 is formed at the position of the insulating member 28 corresponding to the one-way valve 23, and the accommodating portion 282 is covered on the outer side of the portion of the valve body 232 of the one-way valve 23 that protrudes from the surface of the wall portion 211 facing the electrode assembly 22.

[0329] Optionally, the main body 281 and the receiving portion 282 of the insulating member 28 may be an integral structure or a separate structure. When the main body 281 and the receiving portion 282 are an integral structure, the main body 281 and the receiving portion 282 may be integrally formed by a process such as injection molding or milling. When the main body 281 and the receiving portion 282 are separate structures, the receiving portion 282 may be connected to the main body 281 by bonding or snapping. For example, in FIG17 , the main body 281 and the receiving portion 282 are an integral structure.

[0330] In some embodiments, as shown in FIG. 5 and FIG. 17 , the accommodating portion 282 is provided with a second through hole 2821 , and the second through hole 2821 is communicated with the air inlet 2322 provided on the valve body 232 .

[0331] Among them, a second through hole 2821 is set on the accommodating portion 282, and the second through hole 2821 passes through the accommodating portion 282, so that the second through hole 2821 can connect the interior of the accommodating portion 282 and the interior of the shell 21, so that the air inlet 2322 of the valve body 232 can connect to the interior of the shell 21 through the second through hole 2821.

[0332] By arranging a second through hole 2821 on the accommodating portion 282, the second through hole 2821 can connect the interior of the shell 21 and the interior of the accommodating portion 282, so that the air inlet 2322 of the valve body 232 of the one-way valve 23 can be connected with the interior of the shell 21 through the second through hole 2821, so that the gas inside the shell 21 can enter the accommodating portion 282 through the second through hole 2821 and then be discharged to the outside of the shell 21 through the one-way valve 23. Therefore, there is no need for the gas to enter the accommodating portion 282 through the gap between the main body 281 and the wall portion 211 and then be discharged through the one-way valve 23, which is beneficial to improving the smoothness of the one-way valve 23 in discharging the gas inside the shell 21.

[0333] In some embodiments, as shown in Figures 5 and 17, along the thickness direction X of the wall portion, the air inlet 2322 is provided at one end of the valve body 232 facing the electrode assembly 22. The accommodating portion 282 includes a first wall 2822 and a second wall 2823. The first wall 2822 is provided around the valve body 232. Along the thickness direction X of the wall portion, one end of the first wall 2822 is connected to the main body portion 281, and the second wall 2823 is connected to the end of the first wall 2822 away from the main body portion 281. The second through hole 2821 is provided in the second wall 2823.

[0334] The first wall 2822 is disposed around the valve body 232 , that is, the first wall 2822 of the accommodating portion 282 is an annular structure disposed around the valve body 232 .

[0335] One end of the first wall 2822 is connected to the main body 281, and the second wall 2823 is connected to the end of the first wall 2822 away from the main body 281. That is, the second wall 2823 is connected to the main body 281 through the first wall 2822, and the second wall 2823 and the first wall 2822 together enclose a accommodating portion 282 for accommodating part of the valve body 232. The second wall 2823 is a wall facing the accommodating portion 282 and the air inlet 2322.

[0336] The second through hole 2821 is provided on the second wall 2823, that is, the second through hole 2821 is provided on the end of the accommodating portion 282 facing the electrode assembly 22. Of course, in other embodiments, the second through hole 2821 may also be provided on the first wall 2822, that is, the second through hole 2821 is provided on one side of the accommodating portion 282 in the radial direction of the accommodating portion 282.

[0337] The accommodating portion 282 is provided with a first wall 2822 and a second wall 2823 which are connected to each other. The first wall 2822 is arranged around the valve body 232, and the second wall 2823 is located at one end of the valve body 232 facing the electrode assembly 22 in the thickness direction X of the wall portion, so that the first wall 2822 and the second wall 2823 enclose a accommodating portion 282 for accommodating the portion of the valve body 232 extending to the interior of the outer shell 21. By arranging the second through hole 2821 of the accommodating portion 282 on the first wall 2822, it is beneficial to increase the path of the gas entering the air inlet 2322 of the valve body 232 from the second through hole 2821, so as to alleviate the phenomenon of electrolyte overflowing with the gas. By arranging the second through hole 2821 of the accommodating portion 282 on the second wall 2823, it is beneficial to realize the corresponding arrangement of the air inlet 2322 and the second through hole 2821, so as to improve the smoothness of the one-way valve 23 discharging the gas inside the outer shell 21.

[0338] According to some embodiments of the present application, the material of the shielding member 24 is the same as that of the wall portion 211 .

[0339] For example, the material of the shielding member 24 and the material of the wall portion 211 can both be copper, iron, aluminum, steel, or aluminum alloy.

[0340] By setting the shielding member 24 and the wall portion 211 to be structures of the same material, on the one hand, it is convenient to assemble the shielding member 24 and the wall portion 211 of the same material to each other, such as welding, which is conducive to reducing the difficulty of assembling the shielding member 24 on the wall portion 211. On the other hand, it can make the appearance of the shielding member 24 and the wall portion 211 the same, which is conducive to improving the appearance of the battery cell 20.

[0341] According to some embodiments of the present application, as shown in Figures 3 and 4, the housing 21 may include a shell 212 and an end cap 213. The shell 212 has an interior formed with an accommodating cavity having an opening 2121 for accommodating the electrode assembly 22. The end cap 213 closes the opening 2121 and is a wall portion 211.

[0342] The end cover 213 is the wall portion 211 , that is, the one-way valve 23 is disposed on the end cover 213 .

[0343] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures. For example, the shell 212 includes a wall portion 211, that is, the one-way valve 23 is installed on a wall of the shell 212. The one-way valve 23 can be installed on the bottom wall of the shell 212 opposite to the end cover 213, or it can be installed on the side wall of the shell 212 adjacent to and connected to the end cover 213.

[0344] By configuring the wall portion 211 of the outer shell 21 as an end cap 213 of the outer shell 21 for sealing the opening 2121 of the housing 212, a battery cell 20 employing this structure facilitates installation of the one-way valve 23 on the end cap 213, thereby reducing the difficulty of assembling the battery cell 20 and improving the production efficiency of the battery cell 20. Similarly, by configuring the wall portion 211 of the outer shell 21 as a wall of the housing 212, a battery cell 20 employing this structure can reduce the effect of stress generated when the end cap 213 and the housing 212 are connected to each other on the one-way valve 23, thereby alleviating damage to the one-way valve 23 and thereby improving the stability and service life of the battery cell 20.

[0345] According to some embodiments of the present application, as shown in Figures 3 and 4, the battery cell 20 also includes a pressure relief mechanism 27, which is arranged on the outer shell 21. The pressure relief mechanism 27 is configured to actuate and release the internal pressure of the battery cell 20 when the battery cell 20 thermally runs away. The actuation pressure of the pressure relief mechanism 27 is greater than the opening pressure of the one-way valve 23.

[0346] The pressure relief mechanism 27 is provided on the outer shell 21 , and may be provided on the end cover 213 or on the housing 212 . For example, in FIG. 4 , the pressure relief mechanism 27 is provided on the end cover 213 .

[0347] The pressure relief mechanism 27 is configured to be actuated and release the internal pressure of the battery cell 20 when the battery cell 20 is in thermal runaway. That is, when thermal runaway occurs inside the battery cell 20, the pressure relief mechanism 27 can be actuated and opened to release the gas generated inside the battery cell 20 due to thermal runaway.

[0348] The actuation pressure of the pressure relief mechanism 27 is greater than the opening pressure of the one-way valve 23. That is, the pressure of the gas inside the housing 21 that opens the pressure relief mechanism 27 is greater than the pressure of the gas inside the housing 21 that opens the one-way valve 23. It should be noted that when a battery cell 20 experiences thermal runaway, the gas inside the housing 21 of the battery cell 20 will rapidly surge, causing the pressure relief mechanism 27 to open and release pressure. However, during normal use of the battery cell 20, when the gas generated inside the housing 21 reaches a threshold, the one-way valve 23 can be opened, but the pressure relief mechanism 27 cannot be opened.

[0349] Optionally, the pressure relief mechanism 27 can be an integral structure with the housing 21, or a separate structure. If the pressure relief mechanism 27 can be an integral structure with the housing 21, the pressure relief mechanism 27 is an area on the housing 21 where a weak structure is provided, for example, an area on the housing 21 where a notched groove is provided. If the pressure relief mechanism 27 can be a separate structure from the housing 21, the pressure relief mechanism 27 can be connected to the housing 21 by welding, hot melting, injection molding, or bonding. For example, in FIG4 , the pressure relief mechanism 27 is a separate structure from the housing 21, and the pressure relief mechanism 27 is provided on the end cover 213 of the housing 21. The pressure relief mechanism 27 can be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, a pressure relief valve, or a safety valve.

[0350] For example, in Figure 4, the electrode terminal 26 and the pressure relief mechanism 27 are both arranged on the end cover 213. Of course, in other embodiments, the electrode terminal 26 and the pressure relief mechanism 27 can also be arranged on different walls of the outer shell 21. For example, the pressure relief mechanism 27 is arranged on the shell 212, and the electrode terminal 26 is arranged on the end cover 213.

[0351] By setting the opening pressure of the one-way valve 23 for opening the exhaust to be lower than the actuating pressure of the pressure relief mechanism 27 for pressure relief, when gas is generated inside the outer shell 21 during normal use of the battery cell 20, it can be discharged to the outside of the outer shell 21 through the one-way valve 23, thereby alleviating the phenomenon of premature actuation of the pressure relief mechanism 27 for pressure relief before the thermal runaway of the battery cell 20 due to the increase in the internal air pressure of the battery cell 20, thereby effectively improving the use stability of the battery cell 20, thereby improving the service life and reliability of the battery cell 20.

[0352] In some embodiments, the one-way valve 23 and the pressure relief mechanism 27 may be disposed on the same wall of the housing 21. For example, the one-way valve 23 and the pressure relief mechanism 27 are both disposed on the end cover 213.

[0353] In some embodiments, the one-way valve 23 and the pressure relief mechanism 27 may be disposed on different walls of the housing 21. For example, the one-way valve 23 is disposed on the end cover 213, and the pressure relief mechanism 27 is disposed on the housing 212.

[0354] In some embodiments, the exhaust rate of the one-way valve 23 is smaller than the exhaust rate of the pressure relief mechanism 27 .

[0355] By setting the exhaust rate of the one-way valve 23 to be lower than the exhaust rate of the pressure relief mechanism 27, the phenomenon that the one-way valve 23 exhausts too quickly and the pressure relief mechanism 27 cannot be actuated to open can be alleviated when the battery cell 20 has thermal runaway. This allows the pressure relief mechanism 27 to actuate and stably discharge the internal pressure of the battery cell 20 when the battery cell 20 has thermal runaway, thereby helping to reduce the risk of fire and explosion of the battery cell 20 when the battery cell 20 has thermal runaway.

[0356] In some embodiments, the battery cell 20 is an alkali metal battery, such as a sodium metal battery or a lithium metal battery. The alkali metal battery is used in conjunction with the one-way valve 23 to promptly discharge gas generated by the alkali metal battery during normal operation, thereby extending the service life of the alkali metal battery.

[0357] According to some embodiments of the present application, the present application further provides a battery 100 , which includes the battery cell 20 of any of the above solutions.

[0358] 2 , the battery 100 may further include a housing 10, in which the battery cells 20 are housed. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which cover each other and together define an assembly space for accommodating the battery cells 20.

[0359] Alternatively, in FIG2 , the second box body 12 may be a hollow structure with one end open, and the first box body 11 may be a plate-like structure, with the first box body 11 covering the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space. Of course, the structure of the box body 10 is not limited to this. In other embodiments, the first box body 11 and the second box body 12 may also be hollow structures with one end open, with the open side of the first box body 11 covering the open side of the second box body 12.

[0360] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder or a rectangular parallelepiped, etc. For example, in FIG2 , the box body 10 is a rectangular parallelepiped structure.

[0361] In some embodiments, the battery cell 20 disposed in the housing 10 may be one or more. For example, in FIG2 , the housing 10 of the battery 100 includes multiple battery cells 20, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a configuration in which multiple battery cells 20 are connected in both series and parallel. Multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 20 is housed in the housing 10. Alternatively, the battery 100 may be a battery module formed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid configuration, and then the multiple battery modules are further connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed in the housing 10.

[0362] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component that connects the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0363] It should be noted that in some embodiments, the battery 100 may not be provided with a housing 10. The battery 100 includes multiple battery cells 20, and the battery 100 composed of multiple battery cells 20 can be directly assembled on an electrical device to provide electrical energy to the electrical device through the multiple battery cells 20. In other words, the housing 10 can serve as part of the electrical device. Taking the vehicle 1000 as an example, the housing 10 can serve as part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can form at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 can form at least a portion of the crossbeam and longitudinal beam of the vehicle 1000.

[0364] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery cell 20 of any of the above solutions, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0365] The electrical device may be any of the aforementioned devices or systems using the battery cell 20 .

[0366] According to some embodiments of the present application, as shown in Figures 3 to 9 and 12 to 14, a battery cell 20 is provided. The battery cell 20 includes a housing 21, an electrode assembly 22, a one-way valve 23, and a shielding member 24. The housing 21 has a wall portion 211. The housing 21 includes a shell 212 and an end cap 213. The shell 212 defines an interior accommodating cavity with an opening 2121, which accommodates the electrode assembly 22. The end cap 213 closes the opening 2121. The end cap 213 serves as the wall portion 211. Along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2112 facing away from the electrode assembly 22. The first surface 2112 is provided with a mounting groove 2113. The bottom surface of the mounting groove 2113 is provided with a mounting hole 2111. The one-way valve 23 is mounted in the mounting hole 2111 and protrudes from the surface of the wall portion 211 facing the electrode assembly 22. The one-way valve 23 is used to exhaust gas from the interior of the housing 21. The one-way valve 23 includes a valve body 232, an elastic member 233, and a blocking member 234. The valve body 232 is mounted on the wall portion 211. A mounting cavity 2321 is formed within the valve body 232. The valve body 232 is provided with an air inlet 2322 and an air outlet 231. The air inlet 2322 connects the mounting cavity 2321 with the interior of the housing 21, while the air outlet 231 connects the mounting cavity 2321 with the exhaust passage 25. The elastic member 233 is mounted within the mounting cavity 2321, and the blocking member 234 is movably mounted within the mounting cavity 2321. The blocking member 234 is configured to block the air inlet 2322 under the action of the elastic member 233 and to open the air inlet 2322 under the action of the gas within the housing 21. The valve body 232 comprises a valve body 2323 and a valve cover 2324. The valve body 2323 is mounted in the mounting hole 2111. An air inlet 2322 is provided on the end of the valve body 2323 facing the electrode assembly 22. The valve cover 2324 is connected to the end of the valve body 2323 facing away from the electrode assembly 22 along the wall thickness direction X. The valve cover 2324 and the valve body 2323 together enclose a mounting cavity 2321. The valve cover 2324 is provided with an air outlet 231. The valve cover 2324 and the sealing member 234 are spaced apart. The ends of the elastic member 233 respectively abut the valve cover 2324 and the sealing member 234. The air inlet 2322 is provided on the bottom surface of the mounting cavity 2321. The shielding member 24 is mounted in the mounting groove 2113 and is made of the same material as the wall 211. Along the thickness direction X of the wall portion, the shielding member 24 is located on the side of the one-way valve 23 facing away from the electrode assembly 22, and the shielding member 24 covers the one-way valve 23. An exhaust channel 25 is formed between the shielding member 24 and the wall portion 211. The exhaust channel 25 connects the gas outlet 231 and the outside of the housing 21. The exhaust channel 25 includes a first exhaust gap 251 and a second exhaust gap 252. The first exhaust gap 251 is formed between the shielding member 24 and the side surface of the mounting groove 2113.The shielding member 24 and the mounting groove 2113 have a rectangular cross-section perpendicular to the thickness direction X of the wall. The outer peripheral surface of the shielding member 24 includes four first corner surfaces 241 and four first side surfaces 242, with each pair of adjacent first side surfaces 242 connected by a first corner surface 241. The bottom surface of the mounting groove 2113 includes four second corner surfaces 2113a and four second side surfaces 2113b, with each pair of adjacent second side surfaces 2113b connected by a second corner surface 2113a. Each first side surface 242 abuts and is welded to the corresponding second side surface 2113b. A first exhaust gap 251 is formed between each first corner surface 241 and the corresponding second corner surface 2113a. Both the first corner surface 241 and the second corner surface 2113a are arcuate surfaces, with the radius of the first corner surface 241 being greater than the radius of the second corner surface 2113a. Along the wall thickness direction X, the shielding member 24 has a second surface 245 facing the one-way valve 23 and a third surface 246 facing away from the one-way valve 23. The second surface 245 overlaps the bottom surface of the mounting groove 2113, while the third surface 246 is flush with the first surface 2112. The second surface 245 is provided with four first grooves 2451. These first grooves 2451 extend radially along the shielding member 24 and penetrate one of the first corner surfaces 241. A second exhaust gap 252 is formed between the bottom surfaces of the first grooves 2451 and the bottom surface of the mounting groove 2113. The second surface 245 is also provided with a second groove 2452. The multiple first grooves 2451 are arranged around the second groove 2452 and are connected to the second groove 2452. The second groove 2452 is connected to the air outlet 231. Along the wall thickness direction X, the air outlet 231 faces the second groove 2452, and the projection of the air outlet 231 is located within the second groove 2452.

[0367] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0368] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, comprising: a housing having a wall portion; an electrode assembly, contained in the housing; a one-way valve, disposed on the wall portion, the one-way valve having an air outlet, the air outlet being used to discharge the gas inside the housing; as well as A shielding member is installed on the wall portion. Along the thickness direction of the wall portion, the shielding member is located on the side of the one-way valve away from the electrode assembly, and the shielding member covers the one-way valve. An exhaust channel is formed between the shielding member and the wall portion, and the exhaust channel connects the air outlet and the outside of the shell.

2. The battery cell according to claim 1, wherein: Along the thickness direction of the wall portion, the wall portion has a first surface facing away from the electrode assembly, the first surface is provided with a mounting groove, the bottom surface of the mounting groove is provided with a mounting hole, at least a portion of the one-way valve is arranged in the mounting hole, and at least a portion of the shielding member is accommodated in the mounting groove.

3. The battery cell according to claim 2, wherein: The exhaust passage includes a first exhaust gap formed between the shielding member and a groove side surface of the mounting groove, and the first exhaust gap is used to communicate the air outlet with the outside of the housing.

4. The battery cell according to claim 3, wherein: The outer peripheral surface of the shielding member includes a first corner surface and at least two first side surfaces, wherein the first corner surface connects two adjacent first side surfaces; The groove side surface of the mounting groove includes a second corner surface and at least two second side surfaces, the second corner surface connects two adjacent second side surfaces, each second side surface is connected to one first side surface, and the first exhaust gap is formed between the second corner surface and the first corner surface.

5. The battery cell according to claim 4, wherein: The first corner surface and the second corner surface are both arc surfaces, and the radius of the first corner surface is greater than the radius of the second corner surface.

6. The battery cell according to claim 4 or 5, wherein: The first side surface is connected to the second side surface by welding.

7. The battery cell according to any one of claims 4 to 6, wherein: The cross section of the shielding member in a direction perpendicular to the thickness of the wall portion is rectangular, and the outer peripheral surface of the shielding member includes four first side surfaces and four first corner surfaces, and the first exhaust gap is formed at at least one of the first corner surfaces.

8. The battery cell according to claim 3, wherein: A groove is disposed on the outer peripheral surface of the shielding member, and the first exhaust gap is formed between the groove bottom surface of the groove and the groove side surface of the mounting groove.

9. The battery cell according to claim 8, wherein: The area of ​​the outer circumferential surface of the shielding member where the groove is not provided is welded and connected to the groove side surface of the installation groove.

10. The battery cell according to claim 3, wherein: The outer circumferential surface of the shielding member is provided with a plurality of protrusions, which are arranged at intervals along the circumference of the shielding member, and the protrusions abut against the groove side surface of the installation groove. The first exhaust gap is formed between the area of ​​the outer circumferential surface of the shielding member where the protrusions are not provided and the groove side surface of the installation groove.

11. The battery cell according to claim 10, wherein: The protrusion is interference-fitted with a groove side surface of the installation groove.

12. The battery cell according to any one of claims 3 to 11, wherein: The exhaust channel further includes a second exhaust gap, which is formed between the shielding member and the bottom surface of the mounting groove, and the second exhaust gap communicates with the first exhaust gap and the air outlet.

13. The battery cell according to claim 12, wherein: Along the thickness direction of the wall portion, the shielding member has a second surface facing the one-way valve, the second surface overlaps the bottom surface of the mounting groove, the second surface is provided with a first groove, and the second exhaust gap is formed between the bottom surface of the first groove and the bottom surface of the mounting groove.

14. The battery cell according to claim 13, wherein: A plurality of first exhaust gaps are formed between the shielding member and the groove side surface of the mounting groove, and the plurality of first exhaust gaps are arranged at intervals along the circumference of the shielding member. A plurality of first grooves are provided on the second surface, and each first exhaust gap is connected to one of the first grooves.

15. The battery cell according to claim 14, wherein: The second surface is further provided with a second groove, a plurality of the first grooves are arranged around the second groove and are all connected with the second groove, and the second groove is connected with the air outlet.

16. The battery cell according to claim 15, wherein: Along the thickness direction of the wall portion, the gas outlet is arranged at an end of the one-way valve away from the electrode assembly, the gas outlet is arranged facing the second groove, and the projection of the gas outlet is located in the second groove.

17. The battery cell according to any one of claims 2 to 16, wherein: Along the thickness direction of the wall portion, the shielding member does not extend beyond the first surface.

18. The battery cell according to claim 17, wherein: The shielding member has a third surface facing away from the one-way valve, and the third surface is flush with the first surface.

19. The battery cell according to any one of claims 2 to 18, wherein: Along the thickness direction of the wall portion, the one-way valve does not exceed the bottom surface of the installation groove.

20. The battery cell according to any one of claims 1 to 19, wherein: The shielding member is fixedly connected to the wall portion.

21. The battery cell according to any one of claims 1 to 20, wherein: The one-way valve comprises: a valve body, arranged on the wall portion, wherein a mounting cavity is formed inside the valve body, and an air inlet and an air outlet are arranged on the valve body, wherein the air inlet is used to connect the mounting cavity with the interior of the housing, and the air outlet is used to connect the mounting cavity with the exhaust passage; An elastic member, disposed in the installation cavity; A blocking member is movably disposed in the installation cavity, and is used to block the air inlet under the action of the elastic member, and is used to open the air inlet under the action of the gas inside the shell.

22. The battery cell according to claim 21, wherein: The valve body comprises: A valve body, disposed on the wall portion, wherein the valve body is provided with the air inlet; A valve cover is provided at an end of the valve body away from the electrode assembly along the thickness direction of the wall portion, the valve cover and the valve body together enclose the installation cavity, and the valve cover is provided with the air outlet.

23. The battery cell according to claim 22, wherein: Along the thickness direction of the wall portion, the valve cover and the blocking member are spaced apart, two ends of the elastic member are respectively against the valve cover and the blocking member, and the air inlet is arranged on the bottom surface of the installation cavity.

24. The battery cell according to claim 21, wherein: Along the thickness direction of the wall portion, the installation cavity penetrates one end of the valve body away from the electrode assembly and forms the gas outlet, and the shielding member is arranged facing the gas outlet.

25. The battery cell according to claim 24, wherein: Along the thickness direction of the wall portion, the shielding member and the blocking member are spaced apart, two ends of the elastic member are respectively against the shielding member and the blocking member, and the air inlet is arranged on the bottom surface of the installation cavity.

26. The battery cell according to any one of claims 1 to 25, wherein: The material of the shielding member is the same as that of the wall portion.

27. The battery cell according to any one of claims 1 to 26, wherein: The housing comprises: A shell body, wherein a receiving cavity with an opening is formed inside, and the receiving cavity is used to receive the electrode assembly; an end cap for closing the opening; Wherein, the end cover is the wall portion; or The housing includes the wall portion.

28. A battery comprising the battery cell according to any one of claims 1 to 27.

29. An electrical device comprising the battery cell according to any one of claims 1 to 27, wherein the battery cell is used to provide electrical energy.

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