Battery cell, battery, and electric device

Abstract

The present application relates to the technical field of batteries, and provides a battery cell, a battery, and an electric device. The battery cell comprises a casing, electrode assemblies, a one-way valve assembly, and a protective patch. The casing is provided with a wall portion, and the electrode assemblies are accommodated in the casing. The one-way valve assembly is arranged on the wall portion and is provided with a discharge port, and the discharge port is used for discharging gas inside the casing. The protective patch is arranged on the side of the wall portion facing away from the electrode assemblies. An information acquisition hole running through the protective patch is formed in the protective patch, the projection of the information acquisition hole in the thickness direction of the wall portion is located in the one-way valve assembly, and the protective patch covers the discharge port. The projection of the information acquisition hole in the thickness direction of the wall portion is located in the one-way valve assembly and covers the discharge port, so that the discharge port is hidden by the protective patch, facilitating the improvement of the aesthetic level of the outer surface of the battery cell; and the risk that the one-way valve assembly is blocked after impurities or particles and the like in the external environment enter the discharge port can be reduced.

Description

Battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2023215515062, 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 a first aspect, an embodiment of the present application provides a battery cell, comprising a shell, an electrode assembly, a one-way valve assembly and a protective patch; the shell has a wall portion; the electrode assembly is accommodated in the shell; the one-way valve assembly is arranged on the wall portion, and the one-way valve assembly has a discharge port, which is used to discharge the gas inside the shell; the protective patch is arranged on the side of the wall portion away from the electrode assembly; wherein, the protective patch is provided with an information collection hole that passes through the protective patch, and the projection of the information collection hole in the thickness direction of the wall portion is located within the one-way valve assembly, and the protective patch covers the discharge port.

[0009] In the above technical solution, a one-way valve assembly is provided on the wall of the shell so that the one-way valve assembly can be opened in one direction and discharge the gas inside the shell to the outside of the shell through the exhaust port. 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 assembly to alleviate the phenomenon that the internal pressure of the battery cell reaches the threshold value in advance 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, a protective patch is provided on the side of the wall portion facing away from the electrode assembly, thereby protecting the wall portion. By providing an information collection hole on the protective patch, the projection of the information collection hole in the thickness direction of the wall portion is located within the one-way valve assembly, and the protective patch covers the discharge port of the one-way valve assembly, so that the information collection hole is a structure corresponding to the one-way valve assembly and covering the discharge port. On the one hand, the discharge port can be hidden by the protective patch, which is beneficial to improving the aesthetics of the outer surface of the battery cell. On the other hand, covering the discharge port with the protective patch can reduce the risk of impurities or particulate matter in the external environment entering the discharge port and causing blockage of the one-way valve assembly, which is beneficial to improving the reliability of the battery cell. On the other hand, by correspondingly arranging the information collection holes of the one-way valve assembly and the protective patch, the area where the battery cell is exhausted through the one-way valve assembly can be corresponding to the area where the information collection hole is set on the protective patch, thereby saving the space occupied by the information collection hole and the one-way valve assembly on the outer surface of the shell, which is beneficial to improving the integration of the battery cell.

[0010] In some embodiments, the one-way valve assembly forms an exposed surface at a position corresponding to the information collection hole, and the exposed surface is a plane.

[0011] In the above technical solution, by setting the exposed surface formed by the information collection hole of the one-way valve assembly corresponding to the information collection hole as a plane, it is convenient to set the information code or connect the detection element for sampling and other components on the exposed surface of the plane structure, and the aesthetics of the outer surface of the battery cell can be further improved.

[0012] In some embodiments, along a thickness direction of the wall portion, the wall portion has a first surface facing away from the electrode assembly, and the first surface is flush with the exposed surface.

[0013] In the above technical solution, by setting the exposed surface formed by the information collection hole of the one-way valve assembly corresponding to 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 on the one hand, and on the other hand, it is convenient to set the protective patch on the side of the wall facing away from the electrode assembly, which is beneficial to reduce the difficulty of assembling the protective patch on the wall, so as to reduce the interference effect of the one-way valve assembly on the protective patch.

[0014] In some embodiments, the one-way valve assembly forms an exposed surface corresponding to the position of the information collection hole, and the one-way valve assembly includes a one-way valve and a shielding member; the one-way valve is installed 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 connected to the wall portion, and along the thickness direction of the wall portion, the shielding member is located at one end of the one-way valve away from the electrode assembly, the shielding member covers the one-way valve, and the shielding member has a second surface away from the one-way valve, and the second surface includes the exposed surface; wherein, an exhaust channel is formed between the shielding member and the wall portion, the exhaust channel is connected to the air outlet, and one end of the exhaust channel is formed with the discharge port connected to the outside of the shell.

[0015] In the above technical solution, the one-way valve assembly is provided with a one-way valve and a covering member. The one-way valve is used to discharge the gas inside the shell through the air outlet. By arranging a covering member at the end of the one-way valve away from the electrode assembly, and the covering member covers the one-way valve, a second surface of the covering member away from the one-way valve is formed with an exposed surface, so that the projection of the information collection hole of the protective patch in the thickness direction of the wall is located within the second surface. The one-way valve assembly with this structure is convenient for arranging the information collection hole correspondingly through the covering member to form an exposed surface on the covering member, so that information codes can be set on the covering member or components such as detection elements for sampling can be connected, which is beneficial to reducing damage or pulling of the one-way valve caused by components such as information codes or detection elements. On the other hand, after covering the one-way valve with the covering member, it is convenient to form an exposed surface on the covering member, which is beneficial to reducing the difficulty of forming the exposed surface.

[0016] 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.

[0017] 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.

[0018] In some embodiments, the exhaust channel includes a first exhaust gap formed between the shielding member and the groove side of the mounting groove, and the first exhaust gap forms the exhaust port at one end of the wall portion away from the electrode assembly in the thickness direction of the wall portion.

[0019] 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, and the first exhaust gap forms a discharge port at one end away from the electrode assembly in the thickness direction of the wall, 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 adopting this structure does not need to have a channel opened on the shielding member, which is conducive to reducing the processing difficulty, improving the appearance of the battery cell, and facilitating the protective patch to cover the discharge port.

[0020] 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 connects the first exhaust gap and the air outlet.

[0021] 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 hole to alleviate the phenomenon of exhaust obstruction between the air outlet hole 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 hole of the one-way valve to the first exhaust gap.

[0022] In some embodiments, along a thickness direction of the wall portion, the shielding member does not extend beyond the first surface.

[0023] 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.

[0024] In some embodiments, the first surface is flush with the second surface.

[0025] In the above technical solution, by setting the second 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, on the one hand, it is beneficial to further improve the aesthetics of the outer surface of the battery cell and facilitate the formation of an exposed surface on the second surface of the shielding member. On the other hand, it is convenient to set the protective patch on the side of the wall facing away from the electrode assembly, which is beneficial to reduce the difficulty of assembling the protective patch on the wall.

[0026] In some embodiments, the one-way valve includes a valve body, an elastic member and a sealing member; the valve body is installed on the wall portion, an installation cavity is formed inside the valve body, an air inlet and an air outlet are provided on the valve body, the air inlet connects the installation cavity and the interior of the outer shell, and the air outlet connects 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 outer shell.

[0027] In the above technical solution, the one-way valve includes a valve body, an elastic member and a sealing member. The valve body is arranged on the wall, and an air inlet hole connecting the installation cavity and the inside of the shell and an air outlet hole 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 hole 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 hole, so that the gas inside the shell can be discharged after the one-way opening of the one-way valve, thereby realizing the one-way exhaust function of the one-way valve.

[0028] In some embodiments, the valve body includes a valve body and a valve cover; the valve body is installed on the wall portion, and the valve body is provided with the air inlet hole at one end close to the electrode assembly in the thickness direction of the wall portion; along the thickness direction of the wall portion, the valve cover is connected to the end of the valve body away from the electrode assembly, the valve cover and the valve body together enclose the installation cavity, the valve cover and the sealing member are spaced apart, the two ends of the elastic member are respectively against the valve cover and the sealing member, and the valve cover is provided with the air outlet hole.

[0029] 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 facing away from the electrode assembly in the thickness direction of the wall portion, so that the valve cover and the valve body jointly define an installation cavity for accommodating the elastic member and the blocking member. A one-way valve with this structure is provided with the valve body in two parts, thereby facilitating the assembly of the elastic member and the blocking member into the installation cavity, which helps to reduce the difficulty of assembling the one-way valve. In addition, by arranging the valve cover and the blocking member in a structure spaced apart along the thickness direction of the wall portion, the two ends of the elastic member can respectively abut against the valve cover and the blocking member, so that the blocking member can, under the action of the elastic member, block the air inlet provided at the end of the valve body facing the electrode assembly in the thickness direction of the wall portion. The one-way valve with this structure facilitates 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.

[0030] In some embodiments, the one-way valve assembly forms an exposed surface at the position corresponding to the information collection hole, and the one-way valve assembly includes a one-way valve, which is installed on the wall portion and has the discharge port; wherein, along the thickness direction of the wall portion, the one-way valve is provided with the exposed surface at one end away from the electrode assembly.

[0031] In the above technical solution, the one-way valve assembly is provided with a one-way valve, and the one-way valve has a discharge port, so that the one-way valve can directly discharge the gas inside the shell through the discharge port. By forming an exposed surface at one end of the one-way valve away from the electrode assembly, so that the projection of the information collection hole of the protective patch in the thickness direction of the wall directly falls into the one-way valve, the one-way valve is a structure arranged corresponding to the information collection hole in the thickness direction of the wall, so that the information code can be directly set in the area of ​​the one-way valve corresponding to the information collection hole or the detection element for sampling and other components can be connected. The structure is simple and easy to assemble, which is conducive to reducing the difficulty of assembling the battery cell.

[0032] In some embodiments, the one-way valve includes a valve body, an elastic member and a sealing member; the valve body is installed on the wall portion, an installation cavity is formed inside the valve body, and an air inlet hole and the exhaust port are provided on the valve body, the air inlet hole connects the installation cavity and the interior of the outer shell, and the exhaust port connects the installation cavity and the outside of the outer shell; 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 hole under the action of the elastic member, and to open the air inlet hole under the action of the gas inside the outer shell; wherein, along the thickness direction of the wall portion, the exposed surface is formed on the end of the valve body away from the electrode assembly.

[0033] In the above technical solution, the one-way valve includes a valve body, an elastic member, and a sealing member. The valve body is arranged on the wall portion, and an air inlet hole connecting the installation cavity and the interior of the shell, as well as an exhaust port connecting the exterior of the shell, is provided on the valve body. By arranging both the elastic member and the sealing member in the installation cavity, the elastic member can apply an elastic force to the sealing member, so that the sealing member can block the air inlet hole, thereby preventing gas outside the shell from entering the interior of the shell. 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 hole, thereby allowing the gas inside the shell to be discharged after being opened in one direction through the one-way valve, thereby realizing the one-way exhaust function of the one-way valve. In addition, by forming an exposed surface at one end of the valve body facing away from the electrode assembly in the thickness direction of the wall portion, the projection of the information collection hole in the thickness direction of the wall portion falls directly onto the valve body, which has a simple structure and is easy to implement.

[0034] In some embodiments, the valve body includes a valve body and a valve cover; the valve body is installed on the wall portion, and the valve body is provided with the air inlet hole at one end close to the electrode assembly in the thickness direction of the wall portion; along the thickness direction of the wall portion, the valve cover is connected to the end of the valve body away from the electrode assembly, the valve cover has a third surface away from the electrode assembly, the third surface includes the exposed surface, the valve cover and the valve body together enclose the installation cavity, the valve cover and the sealing member are spaced apart, and the two ends of the elastic member respectively abut against the valve cover and the sealing member; wherein, an air outlet is provided on the valve cover, the air outlet is connected to the installation cavity, and the air outlet passes through one end of the third surface to form the discharge port; or, a third exhaust gap is formed between the valve cover and the valve body, the third exhaust gap is connected to the installation cavity, and the third exhaust gap forms the discharge port at one end away from the electrode assembly in the thickness direction of the wall portion.

[0035] In the above technical solution, the valve body is provided with a valve body and a valve cover. By connecting the valve cover to the end of the valve body away from the electrode assembly, a bare surface is formed on the third surface of the valve cover away from the electrode assembly, that is, the projection of the information collection hole in the thickness direction of the wall is located within the third surface, thereby facilitating the formation of an exposed surface on the valve body, which helps to reduce the difficulty of forming an exposed surface on the valve body. In addition, by providing an air outlet on the valve cover, the air outlet is formed through one end of the third surface of the valve cover to form a discharge port. A valve body with such a structure can reduce the interference effect of the air outlet on the connection between the valve cover and the valve body, which helps to reduce the difficulty of assembling the valve cover and the valve body. Similarly, by providing a third exhaust gap between the valve cover and the valve body, the third exhaust gap is formed in the thickness direction of the wall away from the end of the electrode assembly to form a discharge port. A valve body with such a structure facilitates the protective patch to cover the discharge port, which helps to reduce the difficulty of the protective patch covering the discharge port.

[0036] In some embodiments, along the thickness direction of the wall portion, the wall portion has a first surface facing away from the electrode assembly, and a mounting hole is provided on the wall portion, the mounting hole passes through the first surface, and at least a portion of the valve body is installed in the mounting hole; wherein the third surface is flush with the first surface.

[0037] In the above technical solution, by setting the third surface of the valve cover facing away from the electrode assembly and the first surface of the wall facing away from the electrode assembly to be flush with each other, on the one hand, it is beneficial to further improve the aesthetics of the outer surface of the battery cell and facilitate the formation of an exposed surface on the third surface of the valve cover. On the other hand, it is convenient to set the protective patch on the side of the wall facing away from the electrode assembly, which is beneficial to reduce the difficulty of assembling the protective patch on the wall.

[0038] In some embodiments, along a thickness direction of the wall portion, the valve body does not extend beyond the first surface.

[0039] In the above technical solution, the valve body is set to a structure that does not extend beyond the first surface of the wall portion away from the electrode assembly, so as to alleviate the phenomenon that the valve body protrudes from the first surface of the wall portion. On the one hand, it is beneficial to improve the aesthetics of the outer surface of the battery cell, and on the other hand, it can reduce the interference effect of the valve body on the protective patch, thereby reducing the difficulty of assembling the protective patch on the wall portion.

[0040] In some embodiments, an adhesive layer is provided on the side of the protective patch facing the wall portion, and the adhesive layer bonds the protective patch and the wall portion; wherein, the adhesive layer is provided with a first avoidance hole at a position corresponding to the information collection hole, and along the thickness direction of the wall portion, the projections of the information collection hole and the discharge port are both located within the first avoidance hole.

[0041] In the above technical solution, an adhesive layer is provided on the side of the protective patch facing the wall, enabling the protective patch to be bonded to the wall via the adhesive layer. This helps reduce the difficulty of assembling the protective patch and improves the stability of the connection of the protective patch to the wall. Furthermore, a first avoidance hole is provided in the adhesive layer at a position corresponding to the information collection hole, with the projections of the information collection hole of the protective patch and the exhaust port of the one-way valve assembly in the thickness direction of the wall both located within the first avoidance hole. This reduces obstruction of the exhaust port by the adhesive layer, allowing gas discharged through the exhaust port of the one-way valve assembly to enter the information collection hole through the gap between the protective patch and the wall before being discharged. This allows the protective patch to be bonded to the wall while minimizing the impact on the exhaust of the one-way valve assembly.

[0042] 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.

[0043] 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 assembly 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 assembly, thereby alleviating damage to the one-way valve assembly or connection failure, thereby improving the stability and service life of the battery cell.

[0044] In a second aspect, an embodiment of the present application further provides a battery comprising the above-mentioned battery cell.

[0045] 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

[0046] 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.

[0047] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0048] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0049] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0050] FIG4 is an exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0051] FIG5 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0052] FIG6 is a schematic diagram of the assembly of a protective patch and a shielding member of a battery cell according to some embodiments of the present application;

[0053] FIG7 is a top view of a battery cell (after removing the protective film) provided in some embodiments of the present application;

[0054] FIG8 is a partial enlarged view of the battery cell at point A shown in FIG7 ;

[0055] FIG9 is a schematic structural diagram of a shielding member of a one-way valve assembly of a battery cell provided in some embodiments of the present application;

[0056] FIG10 is a bottom view of a shielding member of a one-way valve assembly of a battery cell provided in some embodiments of the present application;

[0057] FIG11 is a schematic structural diagram of a one-way valve of a one-way valve assembly of a battery cell provided in some embodiments of the present application;

[0058] FIG12 is an exploded view of the structure of a one-way valve of a one-way valve assembly of a battery cell provided in some embodiments of the present application;

[0059] FIG13 is a cross-sectional view of a one-way valve of a one-way valve assembly of a battery cell provided in some embodiments of the present application;

[0060] FIG14 is a partial cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0061] FIG15 is a partial cross-sectional view of an insulating member provided in some embodiments of the present application;

[0062] FIG16 is a schematic diagram showing the connection between the protective patch and the adhesive layer provided in some embodiments of the present application.

[0063] Icon: 1000-vehicle; 100-battery; 10-box; 101-first box body; 102-second box body; 20-battery cell; 1-housing; 11-wall; 111-mounting hole; 1111-first hole section; 1112-second hole section; 112-first surface; 113-mounting groove; 1131-second corner surface; 1132-second side surface; 12-housing; 121-opening; 13- End cap; 2-electrode assembly; 21-electrode ear; 3-check valve assembly; 31-discharge port; 32-exposed surface; 33-check valve; 331-air outlet; 332-valve body; 3321-installation cavity; 3322-air inlet; 3323-valve body; 3323a-sink; 3323b-connecting portion; 3323c-stress relief groove; 3324-valve cover; 3324a-first guide column; 3324b-first Three surfaces; 333-elastic member; 334-blocking member; 3341-second guide column; 3342-pressing portion; 3342a-clamping groove; 3343-sealing portion; 3343a-clamping portion; 34-shielding member; 341-second surface; 342-first corner surface; 343-first side surface; 344-fourth surface; 3441-first groove; 3442-second groove; 35-exhaust channel; 351-first row Air gap; 352-second exhaust gap; 4-protective patch; 41-information collection hole; 42-second avoidance hole; 43-third avoidance hole; 5-electrode terminal; 6-pressure relief mechanism; 7-insulating part; 71-main body; 72-accommodating part; 721-through hole; 722-first wall; 723-second wall; 8-adhesive layer; 81-first avoidance hole; 200-controller; 300-motor; X-thickness direction of the wall. DETAILED DESCRIPTION

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] The term "plurality" used in this application refers to two or more (including two).

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.).

[0077] 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 / 3O2 (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 NCM 622 ), 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.

[0078] 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.

[0079] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0080] 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.).

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0093] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0094] 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.

[0095] 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.

[0096] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0097] 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.

[0098] In some embodiments, the electrode assembly is a laminate structure.

[0099] 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.

[0100] 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.

[0101] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0102] 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.

[0103] 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.

[0104] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0113] 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.

[0114] 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.

[0115] 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 assembly and a protective patch. The shell has a wall portion, and the electrode assembly is accommodated in the shell. The one-way valve assembly is arranged on the wall portion, and the one-way valve assembly has a discharge port, which is used to discharge the gas inside the shell. The protective patch is arranged on the side of the wall portion away from the electrode assembly. An information collection hole is provided on the protective patch that passes through the protective patch, and the projection of the information collection hole in the thickness direction of the wall portion is located inside the one-way valve assembly, and the protective patch covers the discharge port.

[0116] In a battery cell of this structure, a one-way valve assembly is provided on the wall of the shell so that the one-way valve assembly can be opened in one direction and discharge the gas inside the shell to the outside of the shell through the exhaust port. 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 assembly to alleviate the phenomenon that the internal pressure of the battery cell reaches the threshold value in advance due to the increase in the internal air pressure of the battery cell, causing the battery cell to actuate and release pressure in advance, thereby effectively improving the use stability of the battery cell and improving the service life and reliability of the battery cell.

[0117] In addition, a protective patch is provided on the side of the wall portion facing away from the electrode assembly, thereby protecting the wall portion. By providing an information collection hole on the protective patch, the projection of the information collection hole in the thickness direction of the wall portion is located within the one-way valve assembly, and the protective patch covers the discharge port of the one-way valve assembly, so that the information collection hole is a structure corresponding to the one-way valve assembly and covering the discharge port. On the one hand, the discharge port can be hidden by the protective patch, which is beneficial to improving the aesthetics of the outer surface of the battery cell. On the other hand, covering the discharge port with the protective patch can reduce the risk of impurities or particulate matter in the external environment entering the discharge port and causing blockage of the one-way valve assembly, which is beneficial to improving the reliability of the battery cell. On the other hand, by correspondingly arranging the information collection holes of the one-way valve assembly and the protective patch, the area where the battery cell is exhausted through the one-way valve assembly can be corresponding to the area where the information collection hole is set on the protective patch, thereby saving the space occupied by the information collection hole and the one-way valve assembly on the outer surface of the shell, which is beneficial to improving the integration of the battery cell.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] The housing 10 is used to provide an assembly space for the battery cells 20 and can have various structures. In some embodiments, the housing 10 can include a first housing body 101 and a second housing body 102. The first housing body 101 and the second housing body 102 overlap each other, and the first housing body 101 and the second housing body 102 together define an assembly space for accommodating the battery cells 20. The second housing body 102 can be a hollow structure with one end open, and the first housing body 101 can be a plate-like structure. The first housing body 101 overlaps the open side of the second housing body 102, so that the first housing body 101 and the second housing body 102 together define an assembly space. In other embodiments, the first housing body 101 and the second housing body 102 can also be hollow structures with one end open, with the open side of the first housing body 101 overlapping the open side of the second housing body 102. Of course, the housing 10 formed by the first housing body 101 and the second housing body 102 can have various shapes, such as a cylinder or a rectangular parallelepiped. For example, in FIG. 2 , the box body 10 is in the shape of a cuboid.

[0125] 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.

[0126] 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 .

[0127] 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.

[0128] According to some embodiments of the present application, referring to Figures 3, 4, and 5, 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, and Figure 5 is a partial cross-sectional view of a battery cell 20 provided in some embodiments of the present application. This application provides a battery cell 20 comprising a housing 1, an electrode assembly 2, a one-way valve assembly 3, and a protective patch 4. The housing 1 has a wall 11, and the electrode assembly 2 is housed within the housing 1. The one-way valve assembly 3 is disposed within the wall 11 and has a vent 31 for discharging gas from within the housing 1. The protective patch 4 is disposed on the side of the wall 11 facing away from the electrode assembly 2. An information collection hole 41 is provided on the protective patch 4, extending through the protective patch 4. The projection of the information collection hole 41 in the thickness direction X of the wall is located within the one-way valve assembly 3, and the protective patch 4 covers the vent 31.

[0129] The housing 1 can also be used to contain an electrolyte, such as an electrolyte solution. The housing 1 can have various structural forms, such as a cylinder or a rectangular parallelepiped. Similarly, the housing 1 can be made of various materials, such as copper, iron, aluminum, steel, or an aluminum alloy.

[0130] In some embodiments, the housing 1 may include a shell 12 and an end cover 13, and a accommodating cavity is formed inside the shell 12, which is used to accommodate the electrode assembly 2, and the accommodating cavity has an opening 121. That is, the shell 12 is a hollow structure with an opening 121 at one end, and the end cover 13 covers the opening 121 of the shell 12 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 2 and the electrolyte.

[0131] It should be noted that the wall portion 11 for mounting the one-way valve assembly 3 can be the end cap 13 of the outer shell 1 or a wall of the shell 12 of the outer shell 1. For example, in FIG4 , the wall portion 11 is the end cap 13. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the wall portion 11 can also be the bottom wall of the shell 12 and the end cap 13, which are arranged opposite each other, or the side wall of the shell 12 and the end cap 13, which are adjacent to and connected to each other.

[0132] When assembling the battery cell 20 , the electrode assembly 2 may be placed into the housing 12 first, and the housing 12 may be filled with electrolyte. The end cap 13 may then be placed on the opening 121 of the housing 12 to complete the assembly of the battery cell 20 .

[0133] The housing 12 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, or a prismatic structure. The shape of the housing 12 can be determined based on the specific shape of the electrode assembly 2. For example, if the electrode assembly 2 has a cylindrical structure, a cylindrical housing 12 can be selected; if the electrode assembly 2 has a rectangular parallelepiped structure, a rectangular parallelepiped housing 12 can be selected. Of course, the end cap 13 can also have a variety of structures, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 3, the housing 12 has a rectangular parallelepiped structure.

[0134] Of course, it is understandable that the shell 1 is not limited to the above structure, and the shell 1 may also be other structures. For example, the shell 1 may include a shell 12 and two end covers 13. The shell 12 is a hollow structure with openings 121 on opposite sides. One end cover 13 corresponds to an opening 121 of the shell 12 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 2 and the electrolyte. That is, the shell 12 is formed with openings 121 on opposite sides, and the two end covers 13 are respectively covered on both sides of the shell 12 to close the corresponding openings 121.

[0135] It should be noted that the electrode assembly 2 is the component where the electrochemical reaction occurs in the battery cell 20. The structure of the electrode assembly 2 can be various. For example, the electrode assembly 2 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.

[0136] 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.

[0137] Optionally, the number of electrode assemblies 2 housed within the housing 1 may be one or more. For example, in FIG3 , the housing 1 of a battery cell 20 is provided with two electrode assemblies 2, which are stacked along the thickness of the housing 1. In other embodiments, the number of electrode assemblies 2 housed within the housing 1 may be one, three, four, five, six, seven, or eight, etc.

[0138] It should be noted that the one-way valve assembly 3 is provided on the wall portion 11. The one-way valve assembly 3 is used to exhaust the gas inside the housing 1. That is, the one-way valve assembly 3 can be opened in one direction to exhaust gas, so that the gas inside the housing 1 can be discharged to the outside of the housing 1 through the one-way valve assembly 3. Optionally, the one-way valve assembly 3 can be provided on the wall portion 11 in various structures. The one-way valve assembly 3 can be welded to the wall portion 11, or the one-way valve assembly 3 can be clamped to the wall portion 11, or the one-way valve assembly 3 can be adhered to the wall portion 11. The outside of the housing 1 refers to the external environment of the battery cell 20.

[0139] For example, in FIG5 , a mounting hole 111 is provided on the wall portion 11, and the mounting hole 111 communicates with the interior of the housing 1 and the exterior of the housing 1. Part of the one-way valve assembly 3 is assembled into the mounting hole 111 and extends to the interior of the housing 1 along the thickness direction X of the wall portion. The one-way valve assembly 3 is sealed and communicated with the hole wall surface of the mounting hole 111. It should be noted that the mounting hole 111 can also be directly communicated with the exterior of the housing 1, that is, the mounting hole 111 passes through the first surface 112 of the wall portion 11 away from the electrode assembly 2. The mounting hole 111 can also be indirectly communicated with the exterior of the housing 1. For example, in FIG4 and FIG5 , a mounting groove 113 is provided on the first surface 112 of the wall portion 11 away from the electrode assembly 2, and the mounting hole 111 is provided on the bottom surface of the mounting groove 113, so that the mounting hole 111 is indirectly communicated with the exterior of the housing 1 through the mounting groove 113.

[0140] The one-way valve assembly 3 has a discharge port 31, which is used to discharge the gas inside the shell 1, that is, the one-way valve assembly 3 has a discharge port 31 connected to the outside of the shell 1, so that the gas inside the shell 1 can be discharged to the outside of the shell 1 through the discharge port 31 of the one-way valve assembly 3.

[0141] The protective patch 4 is disposed on the side of the wall 11 facing away from the electrode assembly 2 to protect the wall 11, thereby reducing scratches or wear on the wall 11. The protective patch 4 can be mounted on the wall 11 in various ways, such as adhesive or clip-on.

[0142] The protective patch 4 covers the discharge port 31 of the one-way valve assembly 3, that is, the projection of the discharge port 31 in the thickness direction X of the wall is located inside the protective patch 4, so that the protective patch 4 can cover and hide the discharge port 31. In other words, in the thickness direction X of the wall, the discharge port 31 is not arranged corresponding to the information collection hole 41, and the projection of the discharge hole is not inside the information collection hole 41.

[0143] The protective patch 4 is provided with an information collection hole 41 that passes through the protective patch 4. The projection of the information collection hole 41 in the thickness direction X of the wall is located inside the one-way valve assembly 3, that is, the protective patch 4 is provided with an information collection hole 41. The information collection hole 41 passes through the protective patch 4 along the thickness direction X of the wall, and the information collection hole 41 is provided corresponding to the one-way valve assembly 3, so that the information code set on the one-way valve assembly 3 or the detection element connected to the one-way valve assembly 3 for sampling can be seen through the information collection hole 41.

[0144] 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.

[0145] Optionally, the protective patch 4 is made of an insulating material so that the protective patch 4 protects the outer side of the wall 11, reduces scratches on the wall 11, and also insulates the wall 11 from other components in the external environment, thereby reducing the risk of short circuits. For example, the protective patch 4 can be made of rubber, silicone, plastic, or the like.

[0146] In some embodiments, the battery cell 20 may further include an electrode terminal 5 , which is insulated and mounted on the housing 1 . The electrode terminal 5 is electrically connected to the electrode assembly 2 to output or input electrical energy of the battery cell 20 .

[0147] It should be noted that the electrode terminal 5 is installed on the housing 1 in an insulated manner, that is, there is no electrical connection between the electrode terminal 5 and the housing 1 .

[0148] In FIG3 , the battery cell 20 includes two electrode terminals 5. Correspondingly, each electrode assembly 2 has two tabs 21 with opposite polarities. The two electrode terminals 5 are electrically connected to the two tabs 21 of the electrode assembly 2, respectively, to enable input or output of the positive and negative electrodes of the battery cell 20. It should be noted that the tabs 21 of the electrode assembly 2 are formed by stacking and connecting the regions of the positive electrode sheet that are not coated with the positive electrode active material layer, or by stacking and connecting the regions of the negative electrode sheet that are not coated with the negative electrode active material layer. If the tabs 21 are used to output the positive electrode of the electrode assembly 2, then the tabs 21 are formed by stacking and connecting the regions of the positive electrode sheet that are not coated with the positive electrode active material layer; if the tabs 21 are used to output the negative electrode of the electrode assembly 2, then the tabs 21 are formed by stacking and connecting the regions of the negative electrode sheet that are not coated with the negative electrode active material layer.

[0149] Exemplarily, the material of the electrode terminal 5 may be various, for example, the material of the electrode terminal 5 may be copper, iron, aluminum, steel or aluminum alloy.

[0150] The electrode terminals 5 may be mounted on the housing 1 in various structures. For example, in FIG3 , both electrode terminals 5 are mounted on the end cap 13 of the housing 1. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, both electrode terminals 5 may be mounted on the shell 12 of the housing 1. Similarly, one electrode terminal 5 may be mounted on the shell 12 of the housing 1, and the other electrode terminal 5 may be mounted on the end cap 13 of the housing 1.

[0151] For example, in Figures 3 and 4, both electrode terminals 5 are provided on the wall portion 11. Correspondingly, along the thickness direction X of the wall portion, the protective patch 4 is provided with a second avoidance hole 42 at the position corresponding to the electrode terminal 5. The second avoidance hole 42 runs through both sides of the protective patch 4. The second avoidance hole 42 is used to allow the electrode terminal 5 to pass through to avoid the electrode terminal 5. Among them, there are two electrode terminals 5 provided on the wall portion 11, and correspondingly, the protective patch 4 is provided with two second avoidance holes 42, each of which is used to allow one electrode terminal 5 to pass through.

[0152] In some embodiments, the battery cell 20 may further include a pressure relief mechanism 6, which is mounted on the housing 1. Optionally, the pressure relief mechanism 6 may be disposed on the end cap 13 of the housing 1 or on the shell 12 of the housing 1. The pressure relief mechanism 6 is configured to relieve the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0153] For example, in Figures 3 and 4, the pressure relief mechanism 6 is arranged on the wall 11 of the outer shell 1, and correspondingly, along the thickness direction X of the wall, the protective patch 4 is provided with a third avoidance hole 43 at the position corresponding to the pressure relief mechanism 6. The third avoidance hole 43 passes through both sides of the protective patch 4, and along the thickness direction X of the wall, the projection of the pressure relief mechanism 6 is located in the third avoidance hole 43, so that the third avoidance hole 43 can avoid the pressure relief mechanism 6, thereby reducing the obstruction of the protective patch 4 to the pressure relief mechanism 6 when releasing the internal pressure of the battery cell 20.

[0154] Exemplarily, the pressure relief mechanism 6 may be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, a pressure relief valve or a safety valve.

[0155] By arranging a one-way valve assembly 3 on the wall 11 of the outer shell 1, the one-way valve assembly 3 can be opened in one direction and discharge the gas inside the outer shell 1 to the outside of the outer shell 1 through the exhaust port 31, so that when gas is generated inside the outer shell 1 during normal use of the battery cell 20, it can be discharged to the outside of the outer shell 1 through the one-way valve assembly 3, 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 use reliability of the battery cell 20. In addition, a protective patch 4 is provided on the side of the wall portion 11 away from the electrode assembly 2, so as to protect the wall portion 11. By providing an information collection hole 41 on the protective patch 4, the projection of the information collection hole 41 in the thickness direction X of the wall portion is located inside the one-way valve assembly 3, and the protective patch 4 covers the discharge port 31 of the one-way valve assembly 3, so that the information collection hole 41 is a structure corresponding to the one-way valve assembly 3 and covering the discharge port 31. On the one hand, the discharge port 31 can be hidden by the protective patch 4, which is beneficial to improving the aesthetics of the outer surface of the battery cell 20. On the other hand, the protective patch Covering the discharge port 31 can reduce the risk of impurities or particulate matter in the external environment entering the discharge port 31 and causing blockage of the one-way valve assembly 3, which is beneficial to improving the reliability of the battery cell 20. On the other hand, by correspondingly arranging the one-way valve assembly 3 and the information collection hole 41 of the protective patch 4, the area where the battery cell 20 is exhausted through the one-way valve assembly 3 can be arranged corresponding to the area where the information collection hole 41 is provided on the protective patch 4, thereby saving the space occupied by the information collection hole 41 and the one-way valve assembly 3 on the outer surface of the housing 1, which is beneficial to improving the integration of the battery cell 20.

[0156] According to some embodiments of the present application, as shown in FIG. 3 and FIG. 5 , the one-way valve assembly 3 forms an exposed surface 32 at a position corresponding to the information collection hole 41 , and the exposed surface 32 is a plane.

[0157] The position of the one-way valve assembly 3 corresponding to the information collection hole 41 forms an exposed surface 32 , that is, the surface of the area where the one-way valve assembly 3 corresponding to the information collection hole 41 of the protective patch 4 is exposed is the exposed surface 32 .

[0158] It should be noted that the exposed surface 32 is a plane, that is, the exposed surface 32 is a continuous and complete plane, and no structures such as holes or grooves are provided on the exposed surface 32 .

[0159] By setting the exposed surface 32 formed by the information collection hole 41 of the one-way valve assembly 3 to a plane, it is convenient to set information codes or connect components such as detection elements for sampling on the exposed surface 32 of the planar structure, and the aesthetics of the outer surface of the battery cell 20 can be further improved.

[0160] In some embodiments, please continue to refer to FIG. 3 and FIG. 5 . Along the thickness direction X of the wall portion, the wall portion 11 has a first surface 112 facing away from the electrode assembly 2 . The first surface 112 is flush with the exposed surface 32 .

[0161] The first surface 112 is flush with the exposed surface 32 , that is, the surface of the area where the information collection hole 41 of the protective patch 4 of the one-way valve assembly 3 is exposed is flush with the outer surface of the wall portion 11 .

[0162] By setting the exposed surface 32 formed by the information collection hole 41 of the one-way valve assembly 3 and the first surface 112 of the wall 11 facing away from the electrode assembly 2 to be flush with each other, it is beneficial to further improve the aesthetics of the outer surface of the battery cell 20 on the one hand, and on the other hand, it is convenient to set the protective patch 4 on the side of the wall 11 facing away from the electrode assembly 2, which is beneficial to reduce the difficulty of assembling the protective patch 4 on the wall 11, so as to reduce the interference of the one-way valve assembly 3 on the protective patch 4.

[0163] According to some embodiments of the present application, referring to Figures 3, 4, and 5, and further referring to Figure 6, Figure 6 is a schematic diagram of the assembly of the protective patch 4 and the shielding member 34 of the battery cell 20 provided in some embodiments of the present application. The one-way valve assembly 3 forms an exposed surface 32 at the position corresponding to the information collection hole 41. The one-way valve assembly 3 includes a one-way valve 33 and a shielding member 34. The one-way valve 33 is installed on the wall 11. The one-way valve 33 has an air outlet 331. The air outlet 331 is used to discharge the gas inside the housing 1. The shielding member 34 is connected to the wall 11. Along the thickness direction X of the wall, the shielding member 34 is located at the end of the one-way valve 33 away from the electrode assembly 2. The shielding member 34 covers the one-way valve 33. The shielding member 34 has a second surface 341 away from the one-way valve 33. The second surface 341 includes the exposed surface 32. An exhaust passage 35 is formed between the shielding member 34 and the wall portion 11 . The exhaust passage 35 is connected to the air outlet 331 . An exhaust port 31 connected to the outside of the housing 1 is formed at one end of the exhaust passage 35 .

[0164] Among them, the one-way valve 33 is installed on the wall 11, and the one-way valve 33 has an air outlet 331, which is used to discharge the gas inside the shell 1, that is, the one-way valve 33 can be opened in one direction and then exhausted through the air outlet 331, so that the gas inside the shell 1 can be discharged into the exhaust channel 35 through the one-way valve 33, and then discharged to the outside of the shell 1 through the exhaust port 31 of the exhaust channel 35. Optionally, the structure of the one-way valve 33 set on the wall 11 can be various, the one-way valve 33 can be welded to the wall 11, the one-way valve 33 can be clamped on the wall 11, or the one-way valve 33 can be bonded to the wall 11.

[0165] 5 , the one-way valve 33 is partially assembled into the mounting hole 111 and extends to the interior of the housing 1 along the thickness direction X of the wall portion, and the one-way valve 33 is sealed to the wall surface of the mounting hole 111 .

[0166] The shielding member 34 is mounted on the wall portion 11, along the wall thickness direction X, and is located at the end of the one-way valve 33 that faces away from the electrode assembly 2. That is, the shielding member 34 and the one-way valve 33 are arranged along the wall thickness direction X, and the shielding member 34 is farther away from the electrode assembly 2 than the one-way valve 33. Optionally, the shielding member 34 can be mounted on the wall portion 11 in various structures. For example, the shielding member 34 can be mounted on the wall portion 11 by welding, interference fit, bolt connection, clamping, or bonding.

[0167] The shielding member 34 covers the one-way valve 33 , that is, the projection of the one-way valve 33 in the thickness direction X of the wall is located inside the shielding member 34 .

[0168] The shielding member 34 has a second surface 341 facing away from the one-way valve 33, and the second surface 341 includes an exposed surface 32. That is, in the thickness direction X of the wall, the shielding member 34 is arranged corresponding to the information collection hole 41 of the protective patch 4, so that the projection of the information collection hole 41 is located within the second surface 341 of the shielding member 34, so that the area of ​​the second surface 341 exposed by the information collection hole 41 is the exposed surface 32.

[0169] An exhaust channel 35 is formed between the shielding member 34 and the wall portion 11, and the exhaust channel 35 is connected to the air outlet 331. That is, the shielding member 34 and the wall portion 11 jointly define the air outlet 331 connecting the one-way valve 33 and the exhaust channel 35 outside the shell 1, so that the gas discharged from the inside of the shell 1 through the air outlet 331 by the one-way valve 33 can enter the exhaust channel 35 and be discharged to the outside of the shell 1.

[0170] One end of the exhaust channel 35 forms an exhaust port 31 communicating with the outside of the housing 1 , that is, one end of the exhaust channel 35 is communicated with the air outlet 331 of the one-way valve 33 , and the other end forms an exhaust port 31 communicating with the outside of the housing 1 .

[0171] For example, the shielding member 34 may be made of copper, iron, aluminum, steel, or aluminum alloy.

[0172] The one-way valve assembly 3 is provided with a one-way valve 33 and a shielding member 34. The one-way valve 33 is used to discharge the gas inside the housing 1 through the air outlet 331. By providing the shielding member 34 at one end of the one-way valve 33 away from the electrode assembly 2, and the shielding member 34 covering the one-way valve 33, so that the second surface 341 of the shielding member 34 away from the one-way valve 33 is formed with an exposed surface 32, so that the projection of the information collection hole 41 of the protective patch 4 in the thickness direction X of the wall is located within the second surface 341. The one-way valve assembly 3 is provided with a one-way valve 33 and a shielding member 34 covering the one-way valve 33. On the one hand, the valve assembly 3 facilitates the corresponding setting of the information collection hole 41 through the shielding member 34 to form an exposed surface 32 on the shielding member 34, so that an information code can be set on the shielding member 34 or components such as detection elements for sampling can be connected, which is beneficial to reducing the damage or pulling of the information code or detection elements and other components on the one-way valve 33. On the other hand, after the one-way valve 33 is covered by the shielding member 34, the exposed surface 32 can be formed on the shielding member 34, which is beneficial to reducing the difficulty of forming the exposed surface 32.

[0173] According to some embodiments of the present application, referring to Figures 4, 5 and 6, along the thickness direction X of the wall portion, the wall portion 11 has a first surface 112 facing away from the electrode assembly 2, the first surface 112 is provided with a mounting groove 113, the bottom surface of the mounting groove 113 is provided with a mounting hole 111, at least a portion of the one-way valve 33 is provided in the mounting hole 111, and at least a portion of the shielding member 34 is accommodated in the mounting groove 113.

[0174] Among them, the first surface 112 is provided with a mounting groove 113, and the bottom surface of the mounting groove 113 is provided with a mounting hole 111, that is, the mounting hole 111 passes through the bottom surface of the mounting groove 113, so that the mounting hole 111 is a structure connected to the outside of the shell 1 through the mounting groove 113.

[0175] At least part of the shielding member 34 is accommodated in the mounting groove 113, that is, the shielding member 34 can be entirely located in the mounting groove 113, or only partially located in the mounting groove 113. For example, in Figures 5 and 6, the shielding member 34 is entirely located in the mounting groove 113.

[0176] By providing a mounting groove 113 on the first surface 112 of the wall portion 11 facing away from the electrode assembly 2, and at least partially accommodating the shielding member 34 in the mounting groove 113, on the one hand, the space occupied by the shielding member 34 and the wall portion 11 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 113 can play a certain positioning and limiting role on the shielding member 34, which is beneficial to reducing the difficulty of assembling the shielding member 34 connected to the wall portion 11.

[0177] According to some embodiments of the present application, referring to Figures 5 and 6, and further referring to Figures 7 and 8, Figure 7 is a top view of a battery cell 20 (after removing the protective patch 4) provided in some embodiments of the present application, and Figure 8 is a partial enlarged view of the battery cell 20 shown in Figure 7 at point A. The exhaust channel 35 may include a first exhaust gap 351, which is formed between the shielding member 34 and the side surface of the mounting groove 113. The first exhaust gap 351 forms a discharge port 31 at an end of the wall portion in the thickness direction X away from the electrode assembly 2.

[0178] Among them, the first exhaust gap 351 plays a role in connecting the air outlet 331 of the one-way valve 33 and the outside of the shell 1. The first exhaust gap 351 can be directly connected to the air outlet 331 of the one-way valve 33. For example, at least part of the projection of the first exhaust gap 351 in the thickness direction X of the wall is located in the mounting hole 111, so that the air outlet 331 of the one-way valve 33 arranged in the mounting hole 111 can be directly connected to the first exhaust gap 351. Of course, the first exhaust gap 351 can also be a structure that is indirectly connected to the air outlet 331 of the one-way valve 33. For example, in Figures 5 and 6, the exhaust channel 35 can also include a second exhaust gap 352. The second exhaust gap 352 is formed between the shielding member 34 and the bottom surface of the mounting groove 113. The second exhaust gap 352 connects the first exhaust gap 351 and the air outlet 331 of the one-way valve 33.

[0179] The first exhaust gap 351 forms an exhaust port 31 at one end away from the electrode assembly 2 in the thickness direction X of the wall, that is, the first exhaust gap 351 is a structure formed between the shielding member 34 and the groove side of the mounting groove 113 and extending along the thickness direction X of the wall, so as to form an exhaust port 31 at one end of the second surface 341 of the shielding member 34 passing through the first exhaust gap 351.

[0180] It should be noted that the structure of the first exhaust gap 351 formed between the shielding member 34 and the groove side of the mounting groove 113 can be various. For example, refer to Figures 7 and 8, and further refer to Figure 9, which is a structural schematic diagram of the shielding member 34 of the one-way valve assembly 3 of the battery cell 20 provided in some embodiments of the present application. The outer peripheral surface of the shielding member 34 includes a first corner surface 342 and at least two first side surfaces 343, and the first corner surface 342 connects the two adjacent first side surfaces 343. The groove side surface of the mounting groove 113 includes a second corner surface 1131 and at least two second side surfaces 1132, and the second corner surface 1131 connects the two adjacent second side surfaces 1132. Each second side surface 1132 is connected to a first side surface 343, and a first exhaust gap 351 is formed between the second corner surface 1131 and the first corner surface 342.

[0181] Among them, the first corner surface 342 connects the two adjacent first side surfaces 343, that is, in the circumferential direction of the shielding member 34, the first corner surface 342 is located between the two first side surfaces 343 and connects the two first side surfaces 343, that is, the first corner surface 342 is the surface at the corner of the outer peripheral surface of the shielding member 34.

[0182] The second corner surface 1131 connects the two adjacent second side surfaces 1132, that is, in the circumferential direction of the mounting groove 113, the second corner surface 1131 is located between the two second side surfaces 1132 and connects the two second side surfaces 1132, that is, the second corner surface 1131 is the surface at the corner of the groove side surface of the mounting groove 113.

[0183] Each first side surface 343 of the shielding member 34 abuts and is connected to the corresponding second side surface 1132 in the groove side surface of the mounting groove 113, so that the first corner surface 342 of the shielding member 34 faces the second corner surface 1131 in the groove side surface of the mounting groove 113, so that a first exhaust gap 351 is formed between the first corner surface 342 and the second corner surface 1131.

[0184] Optionally, the connection structure between the first side surface 343 and the second side surface 1132 can be various, such as welding, bonding, or interference fit. For example, in the embodiment of the present application, the first side surface 343 and the second side surface 1132 are welded together. By configuring the first side surface 343 and the second side surface 1132 as a welded structure, the connection between the shielding member 34 and the side surface of the mounting groove 113 is strengthened, thereby improving the structural stability of the shielding member 34 when assembled to the wall portion 11.

[0185] Of course, the structure of the first air vent gap 351 formed between the shielding member 34 and the side surface of the mounting groove 113 is not limited to this. For example, in other embodiments, the outer circumferential surface of the shielding member 34 may be provided with a first groove, and the outer circumferential surface of the shielding member 34 is used to connect with the side surface of the mounting groove 113 to form the first air vent gap 351 between the bottom surface of the first groove and the side surface of the mounting groove 113. In such an embodiment, the outer circumferential surface of the shielding member 34 may be welded or bonded to the side surface of the mounting groove 113. Similarly, in other embodiments, the outer circumferential surface of the shielding member 34 may be provided with a plurality of first protrusions, the plurality of first protrusions being arranged at intervals along the circumference of the shielding member 34, and the first protrusions being used to connect with the side surface of the mounting groove 113 to form the first air vent gap 351 between the area of ​​the shielding member 34 without the first protrusion and the side surface of the mounting groove 113. In such an embodiment, the first protrusions and the side surface of the mounting groove 113 may be interference fit, welded, or bonded.

[0186] The two adjacent first side surfaces 343 in the outer peripheral surface of the shielding member 34 are connected by a first corner surface 342, and the two connected second side surfaces 1132 in the groove side surfaces of the mounting groove 113 are connected by a second corner surface 1131. Each first side surface 343 is connected to a second side surface 1132, and a first gap is formed between the first corner surface 342 and the second corner surface 1131. That is to say, a first exhaust gap 351 is formed at the corner of the shielding member 34 and the mounting groove 113. On the one hand, it is convenient to form the first exhaust gap 351 between the outer peripheral surface of the shielding member 34 and the groove side surface of the mounting groove 113. The structure is simple and easy to implement. On the other hand, while realizing the formation of the first exhaust gap 351 between the outer peripheral surface of the shielding member 34 and the groove side surface of the mounting groove 113, it is beneficial to increase the connection area between the outer peripheral surface of the shielding member 34 and the groove side surface of the mounting groove 113, which is beneficial to improve the firmness of the shielding member 34 connected to the wall portion 11.

[0187] In some embodiments, as shown in FIG. 7 , FIG. 8 and FIG. 9 , the first corner surface 342 and the second corner surface 1131 are both arc surfaces, and the radius of the first corner surface 342 is greater than the radius of the second corner surface 1131 .

[0188] The first corner surface 342 and the second corner surface 1131 are both arcuate surfaces, that is, the first corner surface 342 is a surface formed at the rounded corner of the outer peripheral surface of the shielding member 34, and similarly, the second corner surface 1131 is a surface formed at the rounded corner of the side surface of the mounting groove 113. Of course, in other embodiments, the first corner surface 342 may also be a surface formed at the chamfered corner of the outer peripheral surface of the shielding member 34, and the second corner surface 1131 may also be a surface formed at the chamfered corner of the side surface of the mounting groove 113.

[0189] The radius of the first corner surface 342 is greater than the radius of the second corner surface 1131 , that is, the diameter of the rounded corner of the outer peripheral surface of the shielding member 34 is greater than the diameter of the rounded corner of the groove side surface of the installation groove 113 .

[0190] By setting the first corner surface 342 and the second corner surface 1131 as arc surfaces, and the radius of the first corner surface 342 is greater than the radius of the second corner surface 1131, a first exhaust gap 351 is formed between the first corner surface 342 and the second corner surface 1131, which has a simple structure and is easy to manufacture and process.

[0191] In some embodiments, please continue to refer to Figures 7, 8 and 9, the cross-section of the shielding member 34 in the thickness direction X perpendicular to the wall is rectangular, and the outer peripheral surface of the shielding member 34 includes four first side surfaces 343 and four first corner surfaces 342, and a first exhaust gap 351 is formed at at least one first corner surface 342.

[0192] The cross section of the shielding member 34 in the thickness direction X perpendicular to the wall is rectangular, that is, the shielding member 34 is a rectangular structure. Correspondingly, the shape of the mounting groove 113 matches the shielding member 34, and the mounting groove 113 is also a rectangular structure.

[0193] A first exhaust gap 351 is formed at at least one first corner surface 342, that is, among the four first corner surfaces 342 of the shielding member 34, only one first corner surface 342 may have a first exhaust gap 351 formed thereat, or two, three or four first corner surfaces 342 may have a first exhaust gap 351 formed thereat.

[0194] It should be noted that, in other embodiments, the cross-section of the shielding member 34 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 setting the shielding member 34 as a rectangular plate structure, the four sides of the shielding member 34 form four first side surfaces 343, and four first corner surfaces 342 are formed at the four right angles of the shielding member 34, which is simple in structure and easy to manufacture.

[0196] By forming a first exhaust gap 351 that is connected to the outside of the shell 1 between the shielding member 34 and the side surface of the mounting groove 113, and forming a discharge port 31 at one end of the first exhaust gap 351 away from the electrode assembly 2 in the thickness direction X of the wall, the gas discharged from the one-way valve 33 can be discharged to the outside of the shell 1 through the first exhaust gap 351. The battery cell 20 adopting this structure does not need to have a channel opened on the shielding member 34, which is conducive to reducing the processing difficulty, can improve the appearance of the battery cell 20, and is convenient for the protective patch 4 to cover the discharge port 31.

[0197] According to some embodiments of the present application, as shown in Figures 5 and 6, the exhaust channel 35 may also include a second exhaust gap 352, which is formed between the shielding member 34 and the bottom surface of the mounting groove 113. The second exhaust gap 352 connects the first exhaust gap 351 and the air outlet 331.

[0198] In which, the second exhaust gap 352 is formed between the shielding member 34 and the bottom surface of the mounting groove 113. The shielding member 34 and the bottom surface of the mounting groove 113 can be arranged at intervals along the thickness direction X of the wall portion, so that the second exhaust gap 352 is formed between the surface of the shielding member 34 facing the bottom surface of the mounting groove 113 and the bottom surface of the mounting groove 113. Alternatively, a first groove 3441 is provided on the surface of the shielding member 34 facing the bottom surface of the mounting groove 113, so that the second exhaust gap 352 is formed between the bottom surface of the first groove 3441 and the bottom surface of the mounting groove 113.

[0199] It should be noted that in other embodiments, a first groove 3441 can be provided on the bottom surface of the mounting groove 113 to form a second exhaust gap 352 between the bottom surface of the first groove 3441 and the surface of the shielding member 34 facing the bottom surface of the mounting groove 113.

[0200] For example, referring to Figures 5 and 6 , and further to Figure 10 , Figure 10 is a bottom view of a shielding member 34 of a one-way valve assembly 3 of a battery cell 20 according to some embodiments of the present application. Along the thickness direction X of the wall portion, the shielding member 34 has a fourth surface 344 facing the one-way valve 33. The fourth surface 344 overlaps the bottom surface of the mounting groove 113 . The fourth surface 344 is provided with a first groove 3441 , and a second venting gap 352 is formed between the bottom surface of the fourth surface 344 and the bottom surface of the mounting groove 113 .

[0201] Among them, the fourth surface 344 overlaps the bottom surface of the installation groove 113, that is, part of the fourth surface 344 abuts against the bottom surface of the installation groove 113, that is, along the thickness direction X of the wall, the shielding member 34 abuts against the bottom surface of the installation groove 113.

[0202] A second exhaust gap 352 is formed between the bottom surface of the first groove 3441 and the bottom surface of the mounting groove 113 . That is, the bottom surface of the first groove 3441 , the side surface of the first groove 3441 and the bottom surface of the mounting groove 113 jointly define the second exhaust gap 352 .

[0203] By overlapping the fourth surface 344 of the shielding member 34 on the bottom surface of the mounting groove 113, the shielding member 34 is abutted against the bottom surface of the mounting groove 113, so as to improve the structural stability and reliability of the shielding member 34 installed in the mounting groove 113. In addition, by setting a first groove 3441 on the fourth surface 344, a second exhaust gap 352 is formed between the bottom surface of the first groove 3441 and the bottom surface of the mounting groove 113, so that the gas discharged from the air outlet 331 of the one-way valve 33 can enter the first exhaust gap 351 through the first groove 3441 and then be discharged to the outside of the shell 1, so that the shielding member 34 can be abutted against the bottom surface of the mounting groove 113 and the first exhaust gap 351 can be connected with the air outlet 331 through the first groove 3441.

[0204] In some embodiments, referring to Figures 5, 7, 8 and 10, a plurality of first exhaust gaps 351 are formed between the shielding member 34 and the side surface of the mounting groove 113, and the plurality of first exhaust gaps 351 are arranged at intervals along the circumference of the shielding member 34. A plurality of first grooves 3441 are provided on the fourth surface 344, and each first exhaust gap 351 is connected to a first groove 3441.

[0205] The first groove 3441 extends radially along the shielding member 34 and penetrates the first corner surface 342, so that the second venting gap 352 formed between the bottom surface of the first groove 3441 and the bottom surface of the mounting groove 113 can communicate with the first venting gap 351 formed between the first corner surface 342 and the second corner surface 1131. Of course, in an embodiment in which the first venting gap 351 is formed between the bottom surface of the first groove of the shielding member 34 and the side surface of the mounting groove 113, the first groove 3441 penetrates the bottom surface of the first groove. Similarly, in an embodiment in which the first venting gap 351 is formed between an area of ​​the outer circumferential surface of the shielding member 34 where the first protrusion is not provided and the side surface of the mounting groove 113, the first groove 3441 penetrates the area of ​​the outer circumferential surface of the shielding member 34 where the first protrusion is not provided.

[0206] For example, in Figure 10, the shielding member 34 is a rectangular structure, the shielding member 34 has four first corner surfaces 342, and a first exhaust gap 351 is formed at each first corner surface 342. Correspondingly, four first grooves 3441 are provided on the second surface 341 of the shielding member 34, and each first groove 3441 passes through a first corner surface 342.

[0207] A plurality of first exhaust gaps 351 are formed between the shielding member 34 and the side surface of the mounting groove 113 , and each first exhaust gap 351 is connected to a first groove 3441 , thereby facilitating further improvement of exhaust efficiency.

[0208] In some embodiments, referring to Figures 5, 6 and 10, the fourth surface 344 may further be provided with a second groove 3442, a plurality of first grooves 3441 are arranged around the second groove 3442 and are all connected to the second groove 3442, and the second groove 3442 is connected to the air outlet 331 of the one-way valve 33.

[0209] Along the thickness direction X of the wall, the air outlet 331 is provided at the end of the one-way valve 33 away from the electrode assembly 2 , the air outlet 331 is provided facing the second groove 3442 , and the projection of the air outlet 331 is located in the second groove 3442 .

[0210] Illustratively, the entire projection of the one-way valve 33 in the thickness direction X of the wall is located in the second groove 3442 .

[0211] Exemplarily, four first grooves 3441 are provided on the fourth surface 344 of the shielding member 34, and the four first grooves 3441 are arranged at intervals along the circumference of the second groove 3442. The first grooves 3441 extend along the radial direction of the shielding member 34 and pass through the groove side of the second groove 3442, so that the first grooves 3441 can be connected with the air outlet 331 of the one-way valve 33 through the second grooves 3442, so that the second exhaust gap 352 can be connected with the air outlet 331 of the one-way valve 33 through the second grooves 3442.

[0212] By arranging a second groove 3442 on the fourth surface 344 of the shielding member 34 facing the one-way valve 33, the second groove 3442 is connected to the air outlet 331 of the one-way valve 33, and multiple first grooves 3441 are arranged around the second groove 3442 and are all connected to the second groove 3442, so that the gas discharged from the air outlet 331 of the one-way valve 33 can enter the second groove 3442 and then pass through the multiple first grooves 3441 and then pass through the corresponding first exhaust gaps 351 to be discharged to the outside of the shell 1, which is beneficial to improving the exhaust efficiency and can alleviate the phenomenon of gas accumulation between the shielding member 34 and the one-way valve 33.

[0213] The exhaust channel 35 also includes a second exhaust gap 352 formed between the covering member 34 and the bottom surface of the mounting groove 113, and the second exhaust gap 352 connects the first exhaust gap 351 and the air outlet 331 to alleviate the phenomenon of exhaust obstruction between the air outlet 331 and the first exhaust gap 351 caused by the covering member 34 abutting against the bottom surface of the mounting groove 113, thereby improving the smoothness of gas discharge from the air outlet 331 of the one-way valve 33 to the first exhaust gap 351.

[0214] According to some embodiments of the present application, as shown in FIG. 5 and FIG. 6 , along the thickness direction X of the wall portion, the shielding member 34 does not extend beyond the first surface 112 .

[0215] The shielding member 34 does not extend beyond the first surface 112 , that is, the shielding member 34 does not extend out of the mounting groove 113 in the thickness direction X of the wall, so that the entire shielding member 34 is located in the mounting groove 113 .

[0216] By setting the shielding member 34 so as not to extend beyond the first surface 112 of the wall 11 away from the electrode assembly 2 in the thickness direction X of the wall, the mounting groove 113 can provide a certain degree of protection for the shielding member 34, thereby further reducing the wear of the shielding member 34.

[0217] In some embodiments, referring to FIG. 5 and FIG. 6 , the first surface 112 is flush with the second surface 341 .

[0218] In this case, along the thickness direction X of the wall, the one-way valve 33 does not exceed the bottom surface of the installation groove 113. That is, the one-way valve 33 is arranged in the installation hole 111 and does not extend into the installation groove 113 in the thickness direction X of the wall.

[0219] For example, in Figures 5 and 6, the end face of the one-way valve 33 facing away from the electrode assembly 2 in the thickness direction X of the wall is flush with the bottom surface of the mounting groove 113, and the projection of the one-way valve 33 in the thickness direction X of the wall is located in the second groove 3442, so that the one-way valve 33 and the bottom surface of the second groove 3442 are structures arranged at intervals along the thickness direction X of the wall, and the end of the one-way valve 33 facing the electrode assembly 2 in the thickness direction X of the wall protrudes from the surface of the wall 11 facing the electrode assembly 2, so that part of the one-way valve 33 extends into the outer shell 1.

[0220] By setting the second surface 341 of the shielding member 34 away from the one-way valve 33 and the first surface 112 of the wall portion 11 away from the electrode assembly 2 to be flush with each other, on the one hand, it is beneficial to further improve the aesthetics of the outer surface of the battery cell 20 and facilitate the formation of an exposed surface 32 on the second surface 341 of the shielding member 34. On the other hand, it is convenient to set the protective patch 4 on the side of the wall portion 11 away from the electrode assembly 2, which is beneficial to reduce the difficulty of assembling the protective patch 4 on the wall portion 11.

[0221] According to some embodiments of the present application, referring to FIG5 and further to FIG11, FIG12, and FIG13, FIG11 is a schematic structural diagram of a one-way valve 33 of a one-way valve assembly 3 of a battery cell 20 according to some embodiments of the present application, FIG12 is an exploded structural diagram of the one-way valve 33 of a one-way valve assembly 3 of a battery cell 20 according to some embodiments of the present application, and FIG13 is a cross-sectional view of the one-way valve 33 of a one-way valve assembly 3 of a battery cell 20 according to some embodiments of the present application. The one-way valve 33 includes a valve body 332, an elastic member 333, and a blocking member 334. The valve body 332 is mounted on the wall portion 11. An installation cavity 3321 is formed within the valve body 332. The valve body 332 is provided with an air inlet 3322 and an air outlet 331. The air inlet 3322 connects the installation cavity 3321 with the interior of the housing 1, and the air outlet 331 connects the installation cavity 3321 with the exhaust passage 35. The elastic member 333 is arranged in the installation cavity 3321, and the blocking member 334 is movably arranged in the installation cavity 3321. The blocking member 334 is used to block the air inlet 3322 under the action of the elastic member 333, and is used to open the air inlet 3322 under the action of the gas inside the shell 1.

[0222] Among them, the air inlet 3322 is used to connect the installation cavity 3321 and the interior of the shell 1, that is, the gas inside the shell 1 can enter the installation cavity 3321 through the air inlet 3322. Similarly, the air outlet 331 is used to connect the installation cavity 3321 and the exhaust channel 35, that is, the gas from the inside of the shell 1 that enters the installation cavity 3321 can enter the exhaust channel 35 through the air outlet 331, and then be discharged to the outside of the shell 1 through the exhaust port 31 of the exhaust channel 35.

[0223] The blocking piece 334 is movably arranged in the installation cavity 3321, that is, the blocking piece 334 can move in the installation cavity 3321, so that the blocking piece 334 can block the air inlet hole 3322 when it moves closer to the air inlet hole 3322, and conversely, the air inlet hole 3322 can be opened when the blocking piece 334 moves away from the air inlet hole 3322.

[0224] The sealing member 334 is used to seal the air inlet 3322 under the action of the elastic member 333, and is used to open the air inlet 3322 under the action of the gas inside the shell 1. That is to say, the elastic member 333 can provide elastic force for the sealing member 334, so that the sealing member 334 can abut against the bottom surface of the installation cavity 3321 to seal the air inlet 3322. Conversely, when the force of the gas inside the shell 1 acting on the sealing member 334 is greater than the elastic force of the elastic member 333, the gas inside the shell 1 can overcome the elastic force of the elastic member 333 and push the sealing member 334 to separate from the bottom surface of the installation cavity 3321, so that the sealing member 334 opens the air inlet 3322, so that the gas inside the shell 1 can enter the installation cavity 3321 through the air inlet 3322 and then be discharged through the air outlet 331.

[0225] Optionally, the elastic member 333 is an elastic component, and its structure can be various, such as a spring, a spring, or elastic rubber. For example, in Figures 12 and 13, the elastic member 333 is a spring. Of course, in other embodiments, the elastic member 333 and the blocking member 334 can also be integrally formed into a single elastic component, such as elastic rubber.

[0226] It should be noted that the projection of the air outlet 331 in the thickness direction X of the wall can be located inside the spring or outside the spring. When there are multiple air outlet holes 331, the projections of the multiple air outlet holes 331 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.

[0227] The one-way valve 33 includes a valve body 332, an elastic member 333 and a blocking member 334. The valve body 332 is arranged on the wall portion 11. The valve body 332 is provided with an air inlet 3322 connecting the installation cavity 3321 and the inside of the shell 1, and an air outlet 331 connecting the installation cavity 3321 and the exhaust channel 35. By arranging both the elastic member 333 and the blocking member 334 in the installation cavity 3321, the elastic member 333 can apply an elastic force to the blocking member 334, so that the blocking member 334 can block the air inlet 3322 to prevent the gas outside the shell 1 from entering the inside of the shell 1. When the pressure inside the shell 1 rises, the gas inside the shell 1 can act on the blocking member 334 and overcome the elastic force of the elastic member 333, so that the blocking member 334 can open the air inlet 3322, so that the gas inside the shell 1 can be discharged after being unidirectionally opened through the one-way valve 33, thereby realizing the one-way exhaust function of the one-way valve 33.

[0228] According to some embodiments of the present application, as shown in Figures 5, 6, 11, 12, and 13, the valve body 332 may include a valve body 3323 and a valve cover 3324. The valve body 3323 is mounted on the wall portion 11. The valve body 3323 is provided with an air inlet 3322 at one end thereof, which is adjacent to the electrode assembly 2, in the thickness direction X of the wall portion. The valve cover 3324 is connected to the end of the valve body 3323 facing away from the electrode assembly 2, along the thickness direction X of the wall portion. The valve cover 3324 and the valve body 3323 together enclose a mounting cavity 3321. The valve cover 3324 is spaced apart from the sealing member 334. The ends of the elastic member 333 respectively abut against the valve cover 3324 and the sealing member 334. The valve cover 3324 is provided with an air outlet 331.

[0229] In which, a mounting hole 111 is provided on the wall 11, the valve body 3323 is installed in the mounting hole 111, and the valve body 3323 extends into the outer shell 1 along the thickness direction X of the wall, that is, the valve body 3323 protrudes from the surface of the wall 11 facing the electrode assembly 2 along the thickness direction X of the wall.

[0230] The valve body 3323 may be installed on the wall portion 11 in various structures. For example, the valve body 3323 may be welded to the wall surface of the mounting hole 111 or bonded to the wall surface of the mounting hole 111 by a sealant.

[0231] Exemplarily, the air inlet 3322 is provided at one end of the valve body 3323 in the wall thickness direction X, close to the electrode assembly 2. That is, the air inlet 3322 extends through the bottom surface of the mounting cavity 3321. Accordingly, the blocking member 334 is movably provided within the mounting cavity 3321 along the wall thickness direction X, so that the blocking member 334 can block the air inlet 3322 when it abuts against the bottom surface of the mounting cavity 3321. Of course, in other embodiments, the air inlet 3322 may also be provided on one side of the valve body 3323 in the radial direction of the valve body 3323. Accordingly, the blocking member 334 is movably provided within the mounting cavity 3321 along the radial direction of the valve body 3323.

[0232] Exemplarily, the air outlet holes 331 are provided on the valve cover 3324, and the air outlet holes 331 penetrate both sides of the valve cover 3324 along the thickness direction X of the wall. In FIG12 , the valve cover 3324 is provided with three air outlet holes 331, and the three air outlet holes 331 are arranged around the central axis of the mounting hole 111. Of course, in other embodiments, the number of air outlet holes 331 provided on the valve cover 3324 may also be one, two, four, or five.

[0233] As an example, a plurality of air outlet holes 331 are provided on the valve cover 3324 , and the plurality of air outlet holes 331 are arranged at equal intervals.

[0234] As an example, a plurality of gas outlet holes 331 are arranged at equal intervals around the center of the valve cover 3324, which allows the gas to flow out more smoothly.

[0235] In some embodiments, as shown in Figures 12 and 13, a valve cover 3324 is connected to the valve body 3323. A recessed groove 3323a is provided at the end of the valve body 3323 facing away from the electrode assembly 2, and at least a portion of the valve cover 3324 is accommodated within the recessed groove 3323a. By providing the recessed groove 3323a at the end of the valve body 3323 facing away from the electrode assembly 2, and by at least partially accommodating the valve cover 3324 within the recessed groove 3323a, the one-way valve 33 employing this structure can, on the one hand, reduce the space occupied by the valve body 332 in the thickness direction X of the wall portion, and on the other hand, improve the structural stability of the valve cover 3324 when assembled to the valve body 3323. The valve cover 3324 can also be protected to a certain extent, thereby reducing wear or damage to the valve cover 3324.

[0236] The installation cavity 3321 passes through the bottom surface of the groove 3323a, and the valve cover 3324 is assembled in the groove 3323a and abuts against the bottom surface of the groove 3323a, so that the valve cover 3324 and the valve body 3323 enclose the installation cavity 3321.

[0237] At least part of the valve cover 3324 is accommodated in the recessed groove 3323a, that is, the valve cover 3324 may be located in the recessed groove 3323a as a whole, or may be located partially in the recessed groove 3323a. In other words, in the thickness direction X of the wall portion, the valve cover 3324 may be extended out of the recessed groove 3323a, or may not be extended out of the recessed groove 3323a. For example, in Figure 13, the valve cover 3324 is located in the recessed groove 3323a as a whole.

[0238] For example, the valve body 3323 can be made of a metal material, such as copper, iron, aluminum, steel, or an aluminum alloy. Similarly, the valve cover 3324 can also be made of a metal material, such as copper, iron, aluminum, steel, or an aluminum alloy. The valve body 3323 and the valve cover 3324 can be made of the same material or different materials.

[0239] The valve body 332 of the one-way valve 33 includes a valve main body 3323 and a valve cover 3324. The valve cover 3324 is connected to the end of the valve main body 3323 that is away from the electrode assembly 2 in the thickness direction X of the wall, so that the valve cover 3324 and the valve main body 3323 jointly define an installation cavity 3321 for accommodating the elastic member 333 and the sealing member 334. The one-way valve 33 with this structure is configured to have the valve body 332 divided into two parts, thereby facilitating the assembly of the elastic member 333 and the sealing member 334 into the installation cavity 3321, which helps to reduce the difficulty of assembling the one-way valve 33. In addition, by arranging the valve cover 3324 and the sealing member 334 to be arranged at intervals along the thickness direction X of the wall, the two ends of the elastic member 333 can respectively abut against the valve cover 3324 and the sealing member 334, so that the sealing member 334 can, under the action of the elastic member 333, seal the air inlet 3322 arranged at one end of the valve body 3323 facing the electrode assembly 2 in the thickness direction X of the wall. The one-way valve 33 with such a structure makes it convenient for the elastic member 333 to apply elastic force to the sealing member 334, so that the sealing member 334 blocks the air inlet 3322, and can reduce the difficulty of assembling the elastic member 333.

[0240] According to some embodiments of the present application, referring to Figures 5, 12 and 13, along the thickness direction X of the wall, the valve cover 3324 and the blocking member 334 are spaced apart, the two ends of the elastic member 333 respectively abut against the valve cover 3324 and the blocking member 334, and the air inlet 3322 is arranged on the bottom surface of the installation cavity 3321.

[0241] Among them, the valve cover 3324 is arranged to face the bottom surface of the installation cavity 3321, and the two ends of the elastic member 333 in the thickness direction X of the wall are respectively abutted against the valve cover 3324 and the sealing member 334, so that the elastic member 333 is compressed between the valve cover 3324 and the sealing member 334, so that the elastic member 333 can provide elastic force for the sealing member 334, so that the sealing member 334 can seal the air inlet hole 3322 arranged on the bottom surface of the installation cavity 3321 under the action of the elastic force of the elastic member 333.

[0242] In some embodiments, as shown in FIG. 12 and FIG. 13 , a first guide post 3324 a is protruded from one side of the valve cover 3324 facing the blocking member 334 , and a portion of the elastic member 333 is sleeved on the outer side of the first guide post 3324 a . By protruding a first guide post 3324a on the side of the valve cover 3324 facing the blocking member 334, and partially sleeved on the outside of the first guide post 3324a, the one-way valve 33 with this structure can, on the one hand, play a certain positioning role for the elastic member 333 through the first guide post 3324a, so as to facilitate the assembly of the elastic member 333, which is conducive to reducing the difficulty of assembling the elastic member 333; on the other hand, the first guide post 3324a can play a certain guiding role when the elastic member 333 is compressed along the thickness direction X of the wall, so as to reduce the radial deformation of the elastic member 333 during the compression process, thereby achieving stable compression of the elastic member 333 along the thickness direction X of the wall, which is conducive to improving the reliability of the elastic member 333 and further reducing the risk of the blocking member 334 accidentally opening the air inlet 3322.

[0243] Among them, the elastic member 333 is a spring, part of which is sleeved on the outside of the first guide column 3324a, and the end of the spring away from the blocking member 334 abuts against the surface of the valve cover 3324 where the first guide column 3324a is protruding, that is, the first guide column 3324a is inserted into the spring.

[0244] Illustratively, the central axis of the first guide column 3324 a coincides with the central axis of the mounting hole 111 , and the central axis of the elastic member 333 coincides with the central axis of the first guide column 3324 a .

[0245] It should be noted that in the embodiment where multiple air outlet holes 331 are provided on the valve cover 3324, the multiple air outlet holes 331 surround the outer side of the first guide column 3324a. Of course, in other embodiments, the air outlet holes 331 can also be a structure that penetrates the first guide column 3324a along the thickness direction X of the wall.

[0246] By arranging the valve cover 3324 and the blocking member 334 to be arranged at intervals along the thickness direction X of the wall, the two ends of the elastic member 333 can respectively abut against the valve cover 3324 and the blocking member 334, so that the blocking member 334 can block the air inlet hole 3322 arranged on the bottom surface of the mounting cavity 3321 along the thickness direction X of the wall under the action of the elastic member 333. That is, the air inlet hole 3322 is arranged at the end of the valve body 3323 facing the electrode assembly 2 in the thickness direction X of the wall, and the blocking member 334 can move along the thickness direction X of the wall under the action of the elastic member 333 and block the air inlet hole 3322. The one-way valve 33 adopting this structure makes it convenient for the elastic member 333 to apply elastic force to the blocking member 334, so that the blocking member 334 blocks the air inlet hole 3322, and can reduce the difficulty of assembling the elastic member 333.

[0247] In some embodiments, referring to Figures 5, 6, 11, 12, and 13, the wall portion 11 has a first surface 112 facing away from the electrode assembly 2. A mounting groove 113 is provided on the first surface 112. The shielding member 34 is assembled into the mounting groove 113. The bottom surface of the mounting groove 113 is provided with a mounting hole 111. The mounting hole 111 communicates with the interior of the housing 1. The valve body 3323 is mounted in the mounting hole 111 and protrudes from the surface of the wall portion 11 facing the electrode assembly 2 along the thickness direction X of the wall portion. The mounting hole 111 includes a first hole segment 1111 and a second hole segment 1112. The first hole segment 1111 and the second hole segment 1112 are arranged along the thickness direction X of the wall portion, with the first hole segment 1111 being located on the side of the second hole segment 1112 facing away from the electrode assembly 2. The aperture of the first hole segment 1111 is larger than the aperture of the second hole segment 1112. The valve body 3323 has a connecting portion 3323b located in the first hole section 1111. The connecting portion 3323b is an annular structure extending along the circumference of the valve body 3323. The connecting portion 3323b is welded to the hole wall surface of the first hole section 1111 to form a weld mark of the annular structure.

[0248] Optionally, as shown in Figures 11 and 13, a stress relief groove 3323c is further provided on the connecting portion 3323b. The stress relief groove 3323c is an annular groove structure that surrounds the outer side of the valve cover 3324. By providing the stress relief groove 3323c on the connecting portion 3323b, the stress relief groove 3323c can relieve the welding stress generated by the welding of the connecting portion 3323b and the hole wall surface of the first hole segment 1111. This can reduce the impact of the welding stress on the weld connecting the hole wall surface of the first hole segment 1111 and the connecting portion 3323b, reduce the risk of weld cracking, and further reduce the risk of seal failure at the weld.

[0249] According to some embodiments of the present application, as shown in Figures 5, 12 and 13, a second guide column 3341 is protruded from the side of the blocking member 334 facing the valve cover 3324, and a portion of the elastic member 333 is sleeved on the outside of the second guide column 3341.

[0250] Among them, the elastic member 333 is a spring, part of which is sleeved on the outside of the second guide column 3341, and the end of the spring away from the valve cover 3324 abuts against the surface of the blocking member 334 on which the second guide column 3341 is protruding, that is, the second guide column 3341 is inserted into the spring.

[0251] Illustratively, the central axis of the second guide column 3341 coincides with the central axis of the mounting hole 111 , and the central axis of the elastic member 333 coincides with the central axis of the second guide column 3341 .

[0252] By protruding a second guide post 3341 on the side of the sealing member 334 facing the valve cover 3324, and partially sleeved on the outside of the second guide post 3341, the one-way valve 33 with this structure can, on the one hand, play a certain positioning role for the elastic member 333 through the second guide post 3341, so as to facilitate the assembly of the elastic member 333, which is conducive to reducing the difficulty of assembling the elastic member 333; on the other hand, the second guide post 3341 can play a certain guiding role when the elastic member 333 is compressed along the thickness direction X of the wall, so as to reduce the radial deformation of the elastic member 333 during the compression process, thereby achieving stable compression of the elastic member 333 along the thickness direction X of the wall, which is conducive to improving the reliability of the elastic member 333 and further reducing the risk of the sealing member 334 accidentally opening the air inlet 3322.

[0253] According to some embodiments of the present application, as shown in Figures 12 and 13, the sealing member 334 may include a pressing portion 3342 and a sealing portion 3343. Along the thickness direction X of the wall, the two ends of the elastic member 333 respectively abut against the pressing portion 3342 and the valve cover 3324 or the shielding member 34, and the sealing portion 3343 is connected to the side of the pressing portion 3342 away from the valve cover 3324 or the shielding member 34. The sealing portion 3343 is used to seal the air inlet 3322.

[0254] The elastic member 333 can provide an elastic force for the pressing portion 3342 so that the pressing portion 3342 can be pressed against the sealing portion 3343 , thereby sealing the air inlet 3322 through the sealing portion 3343 .

[0255] Optionally, the rigidity of the pressing portion 3342 is greater than that of the sealing portion 3343, that is, the deformation resistance of the pressing portion 3342 is greater than that of the sealing portion 3343. This allows the pressing portion 3342 to better press the sealing portion 3343 against the bottom surface of the mounting cavity 3321 to seal the air inlet 3322. For example, the pressing portion 3342 can be made of a variety of materials, such as steel, iron, or aluminum. Similarly, the sealing portion 3343 can also be made of a variety of materials, such as rubber, silicone, or plastic.

[0256] Optionally, the connection structure between the pressing portion 3342 and the sealing portion 3343 can be various, such as clamping, bolting, or bonding.

[0257] It should be noted that in the embodiment where the blocking member 334 is provided with the second guide post 3341 , the second guide post 3341 is protruded from the surface of the pressing portion 3342 facing the valve cover 3324 or the shielding member 34 .

[0258] By setting the sealing member 334 to include a clamping portion 3342 and a sealing portion 3343, the clamping portion 3342 is set on the side of the sealing portion 3343 facing the valve cover 3324, and the sealing portion 3343 is used to seal the air inlet 3322, and the two ends of the elastic member 333 respectively abut against the valve cover 3324 and the clamping portion 3342, so that the elastic member 333 can exert an elastic force on the sealing portion 3343 through the clamping portion 3342, which is beneficial to improve the balance of the elastic force of the elastic member 333 acting on the sealing portion 3343, and thus can effectively improve the sealing effect of the sealing portion 3343 on the air inlet 3322.

[0259] According to some embodiments of the present application, as shown in Figures 12 and 13, along the thickness direction X of the wall portion, the pressing portion 3342 has a snap-fit ​​groove 3342a provided on one side facing the sealing portion 3343. The sealing portion 3343 has a snap-fit ​​portion 3343a protruding from the side facing the pressing portion 3342. The snap-fit ​​portion 3343a is inserted into the snap-fit ​​groove 3342a, and the snap-fit ​​portion 3343a snaps into engagement with the snap-fit ​​groove 3342a. The blocking member 334 with this structure can improve the structural stability of the sealing portion 3343 provided on the pressing portion 3342, thereby reducing the radial slippage of the sealing portion 3343 relative to the pressing portion 3342, thereby facilitating an improvement in the sealing effect of the sealing portion 3343 on the air inlet 3322, thereby reducing the phenomenon of the air inlet 3322 being accidentally opened.

[0260] Illustratively, the clamping portion 3343a is a circular columnar structure, and correspondingly, the clamping groove 3342a is a circular groove.

[0261] In some embodiments, the sealing portion 3343 is bonded to the pressing portion 3342. The use of a bonding structure to connect the sealing portion 3343 and the pressing portion 3342 can, on the one hand, improve the structural stability of the sealing portion 3343 connected to the pressing portion 3342, which helps to reduce the risk of the sealing portion 3343 and the pressing portion 3342 being separated from each other, thereby improving the reliability of the sealing portion 3343 in blocking the air inlet 3322. On the other hand, it facilitates the assembly connection between the sealing portion 3343 and the pressing portion 3342, which helps to reduce the difficulty of assembling the sealing portion 3343 and the pressing portion 3342.

[0262] For example, the material of the sealing portion 3343 can be EPDM, fluororubber, or Teflon. Using EPDM, fluororubber, or Teflon provides the sealing portion 3343 with good corrosion resistance, effectively alleviating electrolyte corrosion on the sealing portion 3343, thereby increasing the service life of the sealing portion 3343 and reducing the ineffective sealing effect of the sealing portion 3343 on the air inlet 3322 caused by corrosion of the sealing portion 3343.

[0263] It should be noted that, in some embodiments, the blocking member 334 may not be provided with the pressing portion 3342 , and the blocking member 334 only includes the sealing portion 3343 , and one end of the elastic member 333 directly abuts against the sealing portion 3343 .

[0264] According to some embodiments of the present application, referring to FIG. 14 , which is a partial cross-sectional view of a battery cell 20 provided in yet other embodiments of the present application, the one-way valve assembly 3 forms an exposed surface 32 at a location corresponding to the information collection hole 41. The one-way valve assembly 3 includes a one-way valve 33 mounted on the wall portion 11 and having a discharge port 31. Along the thickness direction X of the wall portion, the one-way valve 33 forms an exposed surface 32 at the end facing away from the electrode assembly 2.

[0265] The one-way valve 33 has a discharge port 31 , that is, the discharge port 31 for communicating with the outside of the housing 1 is provided on the one-way valve 33 .

[0266] Along the thickness direction X of the wall, an exposed surface 32 is formed at the end of the one-way valve 33 facing away from the electrode assembly 2. That is, along the thickness direction X of the wall, the one-way valve 33 is arranged corresponding to the information collection hole 41 of the protective patch 4, so that the projection of the information collection hole 41 is located within the surface of one end of the one-way valve 33. The area of ​​the one-way valve 33 at the end facing away from the electrode assembly 2, exposed by the information collection hole 41, constitutes the exposed surface 32. In other words, the one-way valve assembly 3 is not provided with a blocking member 34, so that the information collection hole 41 exposes a portion of the one-way valve 33, allowing the information code or detection element used for the application to be disposed on the one-way valve 33. It should be noted that the structure of the one-way valve 33 can be the same as that of the one-way valve 33 described above.

[0267] The one-way valve assembly 3 is provided with a one-way valve 33, and the one-way valve 33 has a discharge port 31, so that the one-way valve 33 can directly discharge the gas inside the shell 1 through the discharge port 31. By forming an exposed surface 32 at the end of the one-way valve 33 facing away from the electrode assembly 2, so that the projection of the information collection hole 41 of the protective patch 4 in the thickness direction X of the wall directly falls into the one-way valve 33, the one-way valve 33 is a structure arranged corresponding to the information collection hole 41 in the thickness direction X of the wall, so that the information code can be directly set in the area of ​​the one-way valve 33 corresponding to the information collection hole 41 or the detection element for sampling can be connected. The structure is simple and easy to assemble, which helps to reduce the difficulty of assembling the battery cell 20.

[0268] In some embodiments, as shown in FIG14 , the one-way valve 33 may include a valve body 332, an elastic member 333, and a blocking member 334. The valve body 332 is mounted on the wall portion 11. A mounting cavity 3321 is formed within the valve body 332. The valve body 332 is provided with an air inlet 3322 and an exhaust port 31. The air inlet 3322 communicates with the mounting cavity 3321 and the interior of the housing 1, while the exhaust port 31 communicates with the exterior of the housing 1. The elastic member 333 is disposed within the mounting cavity 3321. The blocking member 334 is movably disposed within the mounting cavity 3321. The blocking member 334 is configured to block the air inlet 3322 under the action of the elastic member 333 and to open the air inlet 3322 under the action of gas within the housing 1. An exposed surface 32 is formed on the end of the valve body 332 facing away from the electrode assembly 2 along the thickness direction X of the wall portion.

[0269] The valve body 332 is provided with a discharge port 31 , that is, the discharge port 31 for communicating with the outside of the housing 1 is formed on the valve body 332 .

[0270] An exposed surface 32 is formed on the end of the valve body 332 facing away from the electrode assembly 2, that is, the projection of the information collection hole 41 of the protective patch 4 in the thickness direction X of the wall is located within the surface of the end of the valve body 332 facing away from the electrode assembly 2, so that the area of ​​the valve body 332 exposed by the information collection hole 41 forms an exposed surface 32.

[0271] In FIG14 , a mounting hole 111 is provided on the wall portion 11, and a one-way valve 33 is mounted in the mounting hole 111. The mounting hole 111 extends through both sides of the wall portion 11 along the thickness direction X of the wall portion. That is, the mounting hole 111 directly extends through the first surface 112 and the surface of the wall portion 11 facing the electrode assembly 2, so that the mounting hole 111 is directly connected to the exterior of the housing 1. It should be noted that the valve body 332 of the one-way valve 33 is welded to the wall surface of the mounting hole 111. The connection structure can be the same as the connection structure between the one-way valve 33 and the wall surface of the mounting hole 111 described above, and the mounting hole 111 can also have the same structure as the mounting hole 111 described above.

[0272] The one-way valve 33 includes a valve body 332, an elastic member 333 and a blocking member 334. The valve body 332 is arranged on the wall portion 11. The valve body 332 is provided with an air inlet 3322 connecting the installation cavity 3321 and the inside of the shell 1, and an exhaust port 31 connecting the outside of the shell 1. By arranging both the elastic member 333 and the blocking member 334 in the installation cavity 3321, the elastic member 333 can apply an elastic force to the blocking member 334, so that the blocking member 334 can block the air inlet 3322 to prevent the gas outside the shell 1 from entering the inside of the shell 1. When the pressure inside the shell 1 rises, the gas inside the shell 1 can act on the blocking member 334 and overcome the elastic force of the elastic member 333, so that the blocking member 334 can open the air inlet 3322, so that the gas inside the shell 1 can be discharged after being opened in one direction through the one-way valve 33, thereby realizing the one-way exhaust function of the one-way valve 33. In addition, by forming an exposed surface 32 at one end of the valve body 332 away from the electrode assembly 2 in the thickness direction X of the wall, the projection of the information collection hole 41 in the thickness direction X of the wall directly falls on the valve body 332, which is simple in structure and easy to implement.

[0273] In some embodiments, referring to FIG. 14 , the valve body 332 may include a valve main body 3323 and a valve cover 3324. The valve main body 3323 is mounted on the wall portion 11. An air inlet 3322 is provided at one end of the valve main body 3323 proximate to the electrode assembly 2 in the thickness direction X of the wall portion. The valve cover 3324 is connected to the end of the valve main body 3323 facing away from the electrode assembly 2 along the thickness direction X of the wall portion. The valve cover 3324 has a third surface 3324b facing away from the electrode assembly 2. The third surface 3324b includes an exposed surface 32. The valve cover 3324 and the valve main body 3323 together enclose a mounting cavity 3321. The valve cover 3324 is spaced apart from the sealing member 334. The ends of the elastic member 333 respectively abut against the valve cover 3324 and the sealing member 334. The valve cover 3324 is provided with an air outlet 331 , which is connected to the installation cavity 3321 . The air outlet 331 passes through one end of the third surface 3324 b to form a discharge port 31 .

[0274] In which, the valve cover 3324 has a third surface 3324b facing away from the electrode assembly 2, and the third surface 3324b includes an exposed surface 32. That is, in the thickness direction X of the wall, the valve cover 3324 is arranged corresponding to the information collection hole 41 of the protective patch 4, so that the projection of the information collection hole 41 is located within the third surface 3324b of the valve cover 3324, so that the area of ​​the third surface 3324b exposed by the information collection hole 41 is the exposed surface 32.

[0275] The air outlet 331 passes through one end of the third surface 3324b to form a discharge port 31, that is, the valve cover 3324 is provided with an air outlet 331 connecting the installation cavity 3321 and the outside of the shell 1, and the air outlet 331 passes through the third surface 3324b, so that the air outlet 331 passes through one end of the third surface 3324b to be the discharge port 31, that is, the protective patch 4 covers the air outlet 331 in the thickness direction X of the wall.

[0276] Of course, in other embodiments, the exhaust port 31 formed on the valve body 332 may also have other structures. For example, a third exhaust gap may be formed between the valve cover 3324 and the valve body 3323, the third exhaust gap communicating with the mounting cavity 3321, and the third exhaust gap forming the exhaust port 31 at one end of the wall portion away from the electrode assembly 2 in the thickness direction X. That is, in an embodiment where a recessed groove 3323a is provided at one end of the valve body 3323 and the valve cover 3324 is mounted in the recessed groove 3323a, a third exhaust gap may be formed between the valve cover 3324 and the side surface of the recessed groove 3323a, extending along the thickness direction X of the wall portion, so that the third exhaust gap forms the exhaust port 31 at one end of the wall portion away from the electrode assembly 2 in the thickness direction X.

[0277] The valve body 332 comprises a valve body 3323 and a valve cover 3324. By connecting the valve cover 3324 to the end of the valve body 3323 facing away from the electrode assembly 2, an exposed surface 32 is formed on the third surface 3324b of the valve cover 3324, which faces away from the electrode assembly 2. Specifically, the projection of the information collection hole 41 in the wall thickness direction X is located within the third surface 3324b. This facilitates the formation of the exposed surface 32 on the valve body 332, thereby reducing the difficulty of forming the exposed surface 32 on the valve body 332. Furthermore, by providing an air outlet 331 on the valve cover 3324, the air outlet 331 extends through one end of the third surface 3324b of the valve cover 3324 to form a discharge port 31. This structure of the valve body 332 reduces the interference caused by the air outlet 331 on the connection between the valve cover 3324 and the valve body 3323, thereby reducing the difficulty of assembling the valve cover 3324 and the valve body 3323. Similarly, by setting a third exhaust gap between the valve cover 3324 and the valve body 3323, the third exhaust gap forms a discharge port 31 at one end away from the electrode assembly 2 in the thickness direction X of the wall. The valve body 332 with this structure makes it easier for the protective patch 4 to cover the discharge port 31, which helps reduce the difficulty of the protective patch 4 covering the discharge port 31.

[0278] According to some embodiments of the present application, as shown in Figure 14, along the thickness direction X of the wall portion, the wall portion 11 has a first surface 112 facing away from the electrode assembly 2, and a mounting hole 111 is provided on the wall portion 11. The mounting hole 111 passes through the first surface 112, and at least a portion of the valve body 3323 is installed in the mounting hole 111, and the third surface 3324b is flush with the first surface 112.

[0279] By setting the third surface 3324b of the valve cover 3324 facing away from the electrode assembly 2 and the first surface 112 of the wall 11 facing away from the electrode assembly 2 to be flush with each other, on the one hand, it is beneficial to further improve the aesthetics of the outer surface of the battery cell 20 and facilitate the formation of an exposed surface 32 on the third surface 3324b of the valve cover 3324. On the other hand, it is convenient to set the protective patch 4 on the side of the wall 11 facing away from the electrode assembly 2, which is beneficial to reduce the difficulty of assembling the protective patch 4 on the wall 11.

[0280] In some embodiments, please continue to refer to FIG. 14 , along the thickness direction X of the wall, the valve body 3323 does not extend beyond the first surface 112 .

[0281] Illustratively, the end face of the valve body 3323 at one end facing away from the electrode assembly 2 in the thickness direction X of the wall is flush with the first surface 112. Correspondingly, a recess 3323a is provided on the end face of the valve body 3323 at one end facing away from the electrode assembly 2 in the thickness direction X of the wall, and the valve cover 3324 is installed in the recess 3323a. In the thickness direction X of the wall, the third surface 3324b of the valve cover 3324 facing away from the electrode assembly 2 is flush with the end face of the valve body 3323 at one end facing away from the electrode assembly 2 in the thickness direction X of the wall.

[0282] By setting the valve body 3323 to a structure that does not extend beyond the first surface 112 of the wall 11 away from the electrode assembly 2, the phenomenon of the valve body 3323 protruding from the first surface 112 of the wall 11 can be alleviated. On the one hand, it is beneficial to improve the aesthetics of the outer surface of the battery cell 20. On the other hand, it can reduce the interference effect of the valve body 3323 on the protective patch 4, thereby reducing the difficulty of assembling the protective patch 4 on the wall 11.

[0283] In some embodiments, refer to Figures 4, 5, and 14, and further refer to Figure 15, which is a partial cross-sectional view of the insulating member 7 provided in some embodiments of the present application. The battery cell 20 may further include an insulating member 7, which is provided on the side of the wall portion 11 facing the electrode assembly 2. Along the thickness direction X of the wall portion, the valve body 332 of the one-way valve 33 protrudes from the surface of the wall portion 11 facing the electrode assembly 2. The insulating member 7 includes a main body portion 71 and a receiving portion 72. The main body portion 71 is provided on the side of the wall portion 11 facing the electrode assembly 2, and the receiving portion 72 is connected to the main body portion 71. The portion of the valve body 332 of the one-way valve 33 that protrudes from the surface of the wall portion 11 facing the electrode assembly 2 is received in the receiving portion 72.

[0284] The insulating member 7 is provided on the side of the wall portion 11 facing the electrode assembly 2 , and the insulating member 7 serves to separate the wall portion 11 and the electrode assembly 2 to insulate and isolate the wall portion 11 and the electrode assembly 2 .

[0285] Exemplarily, the insulating member 7 can be made of various materials, such as rubber, silicone, or plastic.

[0286] The portion of the valve body 332 of the one-way valve 33 that protrudes from the surface of the wall 11 facing the electrode assembly 2 is accommodated in the accommodating portion 72, that is, the accommodating portion 72 is formed at the position of the insulating part 7 corresponding to the one-way valve 33, and the accommodating portion 72 covers the outer side of the portion of the valve body 332 of the one-way valve 33 that protrudes from the surface of the wall 11 facing the electrode assembly 2.

[0287] Optionally, the main body 71 and the receiving portion 72 of the insulating member 7 can be an integral structure or a separate structure. When the main body 71 and the receiving portion 72 are an integral structure, the main body 71 and the receiving portion 72 can be integrally formed by a process such as injection molding or milling. When the main body 71 and the receiving portion 72 are separate structures, the receiving portion 72 can be connected to the main body 71 by bonding or clamping. For example, in FIG15 , the main body 71 and the receiving portion 72 are an integral structure.

[0288] In some embodiments, referring to FIG. 5 , FIG. 14 and FIG. 15 , the accommodating portion 72 is provided with a through hole 721 , and the through hole 721 is communicated with the air inlet 3322 provided on the valve body 332 .

[0289] Among them, a through hole 721 is set on the accommodating portion 72, and the through hole 721 passes through the accommodating portion 72, so that the through hole 721 can connect the interior of the accommodating portion 72 and the interior of the shell 1, so that the air inlet 3322 of the valve body 332 can connect to the interior of the shell 1 through the through hole 721.

[0290] By providing a through hole 721 on the accommodating portion 72, the through hole 721 can connect the interior of the shell 1 and the interior of the accommodating portion 72, so that the air inlet 3322 of the valve body 332 of the one-way valve 33 can be connected with the interior of the shell 1 through the through hole 721, so that the gas inside the shell 1 can enter the accommodating portion 72 through the through hole 721 and then be discharged to the outside of the shell 1 through the one-way valve 33. Therefore, there is no need for the gas to enter the accommodating portion 72 through the gap between the main body 71 and the wall portion 11 and then be discharged through the one-way valve 33, which is beneficial to improving the smoothness of the one-way valve 33 in discharging the gas inside the shell 1.

[0291] In some embodiments, as shown in Figures 5, 14, and 15, along the thickness direction X of the wall portion, the air inlet hole 3322 is provided at the end of the valve body 332 facing the electrode assembly 2. The accommodating portion 72 includes a first wall 722 and a second wall 723. The first wall 722 is provided around the valve body 332. Along the thickness direction X of the wall portion, one end of the first wall 722 is connected to the main body portion 71, and the second wall 723 is connected to the end of the first wall 722 away from the main body portion 71. The through hole 721 is provided in the second wall 723.

[0292] The first wall 722 is disposed around the valve body 332 , that is, the first wall 722 of the accommodating portion 72 is an annular structure disposed around the valve body 332 .

[0293] One end of the first wall 722 is connected to the main body 71, and the second wall 723 is connected to the end of the first wall 722 away from the main body 71. That is, the second wall 723 is connected to the main body 71 through the first wall 722, and the second wall 723 and the first wall 722 together enclose a accommodating portion 72 for accommodating part of the valve body 332. The second wall 723 is a wall facing the accommodating portion 72 and the air inlet hole 3322.

[0294] The through hole 721 is provided on the second wall 723, that is, the through hole 721 is provided on the end of the accommodating portion 72 facing the electrode assembly 2. Of course, in other embodiments, the through hole 721 can also be provided on the first wall 722, that is, the through hole 721 is provided on one side of the accommodating portion 72 in the radial direction of the accommodating portion 72.

[0295] The accommodating portion 72 is provided with a first wall 722 and a second wall 723 which are connected to each other. The first wall 722 is arranged around the valve body 332, and the second wall 723 is located at one end of the valve body 332 facing the electrode assembly 2 in the thickness direction X of the wall portion, so that the first wall 722 and the second wall 723 enclose a accommodating portion 72 for accommodating the portion of the valve body 332 extending to the interior of the outer shell 1. By arranging the through hole 721 of the accommodating portion 72 on the first wall 722, it is beneficial to increase the path of the gas from the through hole 721 into the air inlet 3322 of the valve body 332, so as to alleviate the phenomenon of electrolyte overflowing with the gas. By arranging the through hole 721 of the accommodating portion 72 on the second wall 723, it is beneficial to realize the corresponding arrangement of the air inlet 3322 and the through hole 721, so as to improve the smoothness of the one-way valve 33 discharging the gas inside the outer shell 1.

[0296] According to some embodiments of the present application, referring to Figures 5, 6, and 14, and further referring to Figure 16, Figure 16 is a schematic diagram illustrating the connection between the protective patch 4 and the adhesive layer 8 provided in some embodiments of the present application. The protective patch 4 is provided with an adhesive layer 8 on the side facing the wall 11. The adhesive layer 8 adheres the protective patch 4 to the wall 11. A first avoidance hole 81 is provided in the adhesive layer 8 at the position corresponding to the information collection hole 41. Along the thickness direction X of the wall, the projections of the information collection hole 41 and the discharge port 31 are both located within the first avoidance hole 81.

[0297] The adhesive layer 8 serves to bond the protective patch 4 and the wall portion 11 . For example, the adhesive layer 8 may be glue or double-sided tape disposed between the protective patch 4 and the wall portion 11 .

[0298] Along the thickness direction X of the wall, the projections of the information collection hole 41 and the discharge port 31 are both located within the first avoidance hole 81, that is, the area defined by the projection of the first avoidance hole 81 on the plane perpendicular to the thickness direction X of the wall covers the information collection hole 41 and the discharge port 31, that is, the first avoidance hole 81 can avoid the information collection hole 41 and the discharge port 31 in the thickness direction X of the wall.

[0299] For example, in Figures 5 and 6, the exhaust channel 35 includes a first exhaust gap 351, and the first exhaust gap 351 is formed between the shielding member 34 and the groove side of the mounting groove 113, and the exhaust port 31 is formed at one end of the first exhaust gap 351 connected to the outside of the shell 1. Correspondingly, the projection of the mounting groove 113 and the shielding member 34 in the thickness direction X of the wall is located within the first avoidance hole 81, so that the first avoidance hole 81 can avoid the mounting groove 113 and the shielding member 34.

[0300] For example, in Figure 14, one end of the air outlet 331 on the valve cover 3324 of the valve body 332 of the one-way valve 33 forms a discharge port 31, and correspondingly, the projection of the air outlet 331 in the thickness direction X of the wall is located within the first avoidance hole 81, so that the first avoidance hole 81 can avoid the air outlet 331.

[0301] Among them, the area defined by the projection of the first avoidance hole 81 in the thickness direction X of the wall covers the information collection hole 41 and the installation groove 113. Since the projection of the information collection hole 41 in the thickness direction X of the wall is located inside the shielding member 34, the area of ​​the first avoidance hole 81 is larger than the area of ​​the installation groove 113, and the area of ​​the installation groove 113 is larger than the area of ​​the information collection hole 41.

[0302] By providing an adhesive layer 8 on the side of the protective patch 4 facing the wall portion 11, the protective patch 4 can be bonded to the wall portion 11 via the adhesive layer 8, thereby reducing the difficulty of assembling the protective patch 4 and improving the stability of the connection of the protective patch 4 to the wall portion 11. In addition, by providing a first avoidance hole 81 at a position on the adhesive layer 8 corresponding to the information collection hole 41, and by projecting the information collection hole 41 of the protective patch 4 and the exhaust port 31 of the one-way valve assembly 3 in the thickness direction X of the wall portion, the adhesive layer 8 reduces obstruction of the exhaust port 31. This allows the gas discharged from the one-way valve assembly 3 through the exhaust port 31 to enter the information collection hole 41 through the gap between the protective patch 4 and the wall portion 11 and then be discharged. This achieves the adhesion of the protective patch 4 to the wall portion 11 while reducing the impact on the exhaust of the one-way valve assembly 3.

[0303] According to some embodiments of the present application, as shown in Figures 3 and 4, the housing 1 may include a shell 12 and an end cap 13. The shell 12 has an interior formed with an accommodating cavity having an opening 121 for accommodating the electrode assembly 2. The end cap 13 closes the opening 121 and is a wall portion 11.

[0304] The end cover 13 is the wall portion 11 , that is, the one-way valve 33 is disposed on the end cover 13 .

[0305] 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 12 includes a wall portion 11, that is, the one-way valve 33 is installed on a wall of the shell 12. The one-way valve 33 can be installed on the bottom wall of the shell 12 opposite to the end cover 13, or it can be installed on the side wall of the shell 12 adjacent to and connected to the end cover 13.

[0306] By configuring the wall portion 11 of the outer shell 1 as the end cap 13 of the outer shell 1 for sealing the opening 121 of the housing 12, a battery cell 20 employing this structure facilitates installation of the one-way valve 33 on the end cap 13, 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 11 of the outer shell 1 as a wall of the housing 12, a battery cell 20 employing this structure can reduce the effect of stress generated when the end cap 13 and the housing 12 are connected to each other on the one-way valve 33, thereby alleviating damage to the one-way valve 33 and thereby improving the stability and service life of the battery cell 20.

[0307] 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 6, which is arranged on the outer shell 1. The pressure relief mechanism 6 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 6 is greater than the opening pressure of the one-way valve 33.

[0308] The pressure relief mechanism 6 is provided on the outer shell 1 , and may be provided on the end cover 13 or on the shell 12 . For example, in FIG. 4 , the pressure relief mechanism 6 is provided on the end cover 13 .

[0309] The pressure relief mechanism 6 is configured to actuate and release the internal pressure of the battery cell 20 when the battery cell 20 thermally runs away. That is, when thermal runaway occurs inside the battery cell 20, the pressure relief mechanism 6 can be actuated and opened to release the gas generated inside the battery cell 20 due to thermal runaway.

[0310] The actuation pressure of the pressure relief mechanism 6 is greater than the opening pressure of the one-way valve 33. That is, the pressure of the gas inside the housing 1 that opens the pressure relief mechanism 6 is greater than the pressure of the gas inside the housing 1 that opens the one-way valve 33. It should be noted that when a battery cell 20 experiences thermal runaway, the gas inside the housing 1 of the battery cell 20 will rapidly surge, causing the pressure relief mechanism 6 to open and release pressure. However, during normal use of the battery cell 20, when the gas generated inside the housing 1 reaches a threshold, the one-way valve 33 can be opened, but the pressure relief mechanism 6 cannot be opened.

[0311] Optionally, the pressure relief mechanism 6 can be an integral structure with the housing 1, or a separate structure. If the pressure relief mechanism 6 can be an integral structure with the housing 1, the pressure relief mechanism 6 is an area on the housing 1 where a weak structure is provided, for example, an area on the housing 1 where a notched groove is provided. If the pressure relief mechanism 6 can be a separate structure from the housing 1, the pressure relief mechanism 6 can be connected to the housing 1 by welding, hot melting, injection molding, or bonding. For example, in FIG4 , the pressure relief mechanism 6 is a separate structure from the housing 1, and the pressure relief mechanism 6 is provided on the end cover 13 of the housing 1. The pressure relief mechanism 6 can be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, a pressure relief valve, or a safety valve.

[0312] For example, in Figure 4, the electrode terminal 5 and the pressure relief mechanism 6 are both arranged on the end cover 13. Of course, in other embodiments, the electrode terminal 5 and the pressure relief mechanism 6 can also be arranged on different walls of the outer shell 1. For example, the pressure relief mechanism 6 is arranged on the shell 12, and the electrode terminal 5 is arranged on the end cover 13.

[0313] By setting the opening pressure of the one-way valve 33 for exhaust to be lower than the actuating pressure of the pressure relief mechanism 6 for pressure relief, when gas is generated inside the shell 1 during normal use of the battery cell 20, it can be discharged to the outside of the shell 1 through the one-way valve 33, thereby alleviating the phenomenon of premature actuation of the pressure relief mechanism 6 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 and improving the service life and reliability of the battery cell 20.

[0314] In some embodiments, the one-way valve 33 and the pressure relief mechanism 6 may be disposed on the same wall of the housing 1 . For example, the one-way valve 33 and the pressure relief mechanism 6 are both disposed on the end cover 13 .

[0315] In some embodiments, the one-way valve 33 and the pressure relief mechanism 6 may be disposed on different walls of the housing 1. For example, the one-way valve 33 is disposed on the end cover 13, and the pressure relief mechanism 6 is disposed on the housing 12.

[0316] In some embodiments, the exhaust rate of the one-way valve 33 is smaller than the exhaust rate of the pressure relief mechanism 6 .

[0317] By setting the exhaust rate of the one-way valve 33 to be lower than the exhaust rate of the pressure relief mechanism 6, the phenomenon that the one-way valve 33 exhausts too quickly and the pressure relief mechanism 6 cannot be actuated to open can be alleviated when the battery cell 20 has thermal runaway. This allows the pressure relief mechanism 6 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.

[0318] In some embodiments, the battery cell 20 is an alkali metal battery, such as a sodium metal battery, a lithium metal battery, etc. The alkali metal battery is used in conjunction with the one-way valve assembly 3 to promptly discharge the gas generated by the alkali metal battery during normal operation, thereby extending the service life of the alkali metal battery.

[0319] 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.

[0320] 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 101 and a second housing body 102, which cover each other and together define an assembly space for accommodating the battery cells 20.

[0321] 2 , the second box body 102 may be a hollow structure with one end open, and the first box body 101 may be a plate-like structure, with the first box body 101 covering the open side of the second box body 102, so that the first box body 101 and the second box body 102 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 101 and the second box body 102 may also be hollow structures with one end open, with the open side of the first box body 101 covering the open side of the second box body 102.

[0322] Of course, the box body 10 formed by the first box body 101 and the second box body 102 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.

[0323] 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.

[0324] 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 .

[0325] 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.

[0326] 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.

[0327] The electrical device may be any of the aforementioned devices or systems using the battery cell 20 .

[0328] According to some embodiments of the present application, as shown in Figures 3 to 13 and 15 to 16, a battery cell 20 is provided. The battery cell 20 includes a housing 1, an electrode assembly 2, a one-way valve assembly 3, a protective patch 4, and an insulating member 7. The housing 1 has a wall portion 11, which includes a shell 12 and an end cap 13. The interior of the shell 12 forms a receiving cavity with an opening 121, which accommodates the electrode assembly 2. The end cap 13 closes the opening 121. The end cap 13 is the wall portion 11. Along the thickness direction X of the wall portion, the wall portion 11 has a first surface 112 facing away from the electrode assembly 2. The first surface 112 is provided with a mounting groove 113, and the bottom surface of the mounting groove 113 is provided with a mounting hole 111. The one-way valve assembly 3 includes a one-way valve 33 and a shielding member 34. The one-way valve 33 is installed in the mounting hole 111 and protrudes from the surface of the wall portion 11 facing the electrode assembly 2. The one-way valve 33 is used to exhaust gas from the interior of the housing 1. The one-way valve 33 includes a valve body 332, an elastic member 333, and a blocking member 334. The valve body 332 is partially disposed within the mounting hole 111, defining a mounting cavity 3321 within the valve body 332. The valve body 332 is provided with an air inlet 3322 and an air outlet 331. The air inlet 3322 connects the mounting cavity 3321 with the interior of the housing 1, while the air outlet 331 connects the mounting cavity 3321 with the exhaust passage 35. The elastic member 333 is disposed within the mounting cavity 3321, and the blocking member 334 is movably disposed within the mounting cavity 3321. The blocking member 334 is configured to block the air inlet 3322 under the action of the elastic member 333 and to open the air inlet 3322 in response to gas within the housing 1. The valve body 332 includes a valve body 3323 and a valve cover 3324. The valve body 3323 is installed in the mounting hole 111, and an air inlet 3322 is provided at one end of the valve body 3323 facing the electrode assembly 2. Along the thickness direction X of the wall, the valve cover 3324 is connected to the end of the valve body 3323 facing away from the electrode assembly 2. The valve cover 3324 and the valve body 3323 together enclose a mounting cavity 3321. The valve cover 3324 is provided with an air outlet 331. The valve cover 3324 and the sealing member 334 are spaced apart. The two ends of the elastic member 333 respectively abut against the valve cover 3324 and the sealing member 334. The air inlet 3322 is provided on the bottom surface of the mounting cavity 3321. The shielding member 34 is made of the same material as the wall portion 11 and is disposed within the mounting groove 113. The shielding member 34 has a second surface 341 facing away from the electrode assembly 2, and the second surface 341 is flush with the first surface 112. Along the thickness direction X of the wall portion, the shielding member 34 is located at the end of the one-way valve 33 facing away from the electrode assembly 2, and the shielding member 34 covers the one-way valve 33. An exhaust passage 35 is formed between the shielding member 34 and the wall portion 11. The exhaust passage 35 includes a first exhaust gap 351 and a second exhaust gap 352. The first exhaust gap 351 is formed between the shielding member 34 and the side surface of the mounting groove 113, and the end of the first exhaust gap 351 that communicates with the exterior of the housing 1 forms the exhaust port 31.The shielding member 34 and the mounting groove 113 have a rectangular cross-section perpendicular to the thickness direction X of the wall. The outer peripheral surface of the shielding member 34 includes four first corner surfaces 342 and four first side surfaces 343, with each pair of adjacent first side surfaces 343 connected by a first corner surface 342. The bottom surface of the mounting groove 113 includes four second corner surfaces 1131 and four second side surfaces 1132, with each pair of adjacent second side surfaces 1132 connected by a second corner surface 1131. Each first side surface 343 abuts and is welded to the corresponding second side surface 1132, forming a first exhaust gap 351 between each first corner surface 342 and the corresponding second corner surface 1131. Both the first corner surface 342 and the second corner surface 1131 are arcuate surfaces, with the radius of the first corner surface 342 being greater than the radius of the second corner surface 1131. Along the wall thickness direction X, the shielding member 34 has a third surface 3324b facing the one-way valve 33. This third surface 3324b overlaps the bottom surface of the mounting groove 113 and is defined by four first grooves 3441. These first grooves 3441 extend radially along the shielding member 34 and penetrate a first corner surface 342. A second exhaust gap 352 is formed between the bottom surfaces of the first grooves 3441 and the bottom surface of the mounting groove 113. The third surface 3324b also has a second groove 3442. The multiple first grooves 3441 are arranged around and communicate with the second groove 3442, which in turn communicates with the air outlet 331. Along the wall thickness direction X, the air outlet 331 faces the second groove 3442, with the projection of the air outlet 331 located within the second groove 3442. The protective patch 4 is disposed on the side of the wall 11 facing away from the electrode assembly 2. An information collection hole 41 is provided through the protective patch 4. The projection of the information collection hole 41 in the wall thickness direction X is located within the second surface 341 of the shielding member 34. The area of ​​the second surface 341 exposed by the information collection hole 41 forms an exposed surface 32. The exposed surface 32 is planar and flush with the first surface 112. The protective patch 4 covers the discharge port 31. An adhesive layer 8 is provided on the side of the protective patch 4 facing the wall 11. The adhesive layer 8 adheres the protective patch 4 to the wall 11. A first avoidance hole 81 is provided in the adhesive layer 8 at the position corresponding to the information collection hole 41. Along the wall thickness direction X, the projections of the information collection hole 41, the mounting slot 113, and the shielding member 34 are all located within the first avoidance hole 81. The insulating member 7 includes a main body 71 and a receiving portion 72 . The main body 71 is arranged on the side of the wall 11 facing the electrode assembly 2 . The receiving portion 72 is connected to the main body 71 . The portion of the one-way valve 33 extending to the interior of the shell 1 is received in the receiving portion 72 .The accommodating portion 72 includes a first wall 722 and a second wall 723. The first wall 722 is arranged around the valve body 332. Along the thickness direction X of the wall, one end of the first wall 722 is connected to the main body 71, and the second wall 723 is connected to the end of the first wall 722 away from the main body 71. A through hole 721 is provided on the second wall 723, and the through hole 721 is connected to the interior of the air inlet hole 3322 shell 1.

[0329] 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.

[0330] 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 assembly, disposed on the wall portion, the one-way valve assembly having a discharge port, the discharge port being used to discharge gas inside the housing; as well as A protective patch, arranged on a side of the wall portion away from the electrode assembly; The protective patch is provided with an information collection hole penetrating the protective patch, the projection of the information collection hole in the thickness direction of the wall portion is located within the one-way valve assembly, and the protective patch covers the discharge port.

2. The battery cell according to claim 1, wherein: The one-way valve component forms an exposed surface corresponding to the position of the information collection hole, and the exposed surface is a plane.

3. The battery cell according to claim 2, wherein: The wall portion has a first surface facing away from the electrode assembly along a thickness direction of the wall portion, and the first surface is flush with the exposed surface.

4. The battery cell according to any one of claims 1 to 3, wherein: The one-way valve assembly forms an exposed surface at a position corresponding to the information collection hole, and the one-way valve assembly includes: a one-way valve, mounted on the wall portion, the one-way valve having an air outlet hole, the air outlet hole being used to discharge the gas inside the shell; a shielding member connected to the wall portion, and located at an end of the one-way valve away from the electrode assembly along the thickness direction of the wall portion, the shielding member covers the one-way valve, and the shielding member has a second surface away from the one-way valve, and the second surface includes the exposed surface; An exhaust passage is formed between the shielding member and the wall portion, the exhaust passage is connected to the air outlet, and one end of the exhaust passage is formed with the discharge port connected to the outside of the shell.

5. The battery cell according to claim 4, 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.

6. The battery cell according to claim 5, 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 forms the exhaust port at one end of the wall portion away from the electrode assembly in the thickness direction of the wall portion.

7. The battery cell according to claim 6, 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.

8. The battery cell according to any one of claims 5 to 7, wherein: Along the thickness direction of the wall portion, the shielding member does not extend beyond the first surface.

9. The battery cell according to claim 8, wherein: The first surface is flush with the second surface.

10. The battery cell according to any one of claims 4 to 9, wherein: The one-way valve comprises: A valve body is mounted on the wall portion, a mounting cavity is formed inside the valve body, an air inlet hole and an air outlet hole are provided on the valve body, the air inlet hole communicates with the mounting cavity and the interior of the shell, and the air outlet hole communicates with the mounting cavity and the exhaust channel; 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 hole under the action of the elastic member, and is used to open the air inlet hole under the action of the gas inside the shell.

11. The battery cell according to claim 10, wherein: The valve body comprises: A valve body is mounted on the wall portion, and the valve body is provided with the air inlet hole at one end close to the electrode assembly in the thickness direction of the wall portion; A valve cover is connected to 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, the valve cover and the sealing member are spaced apart, the two ends of the elastic member respectively abut against the valve cover and the sealing member, and the valve cover is provided with the air outlet.

12. The battery cell according to any one of claims 1 to 3, wherein: The one-way valve assembly forms an exposed surface at a position corresponding to the information collection hole, the one-way valve assembly comprises a one-way valve, the one-way valve is installed on the wall portion, and the one-way valve has the discharge port; Wherein, along the thickness direction of the wall portion, the exposed surface is formed at one end of the one-way valve away from the electrode assembly.

13. The battery cell according to claim 12, wherein: The one-way valve comprises: a valve body mounted on the wall portion, wherein a mounting cavity is formed inside the valve body, and an air inlet hole and the discharge port are provided on the valve body, wherein the air inlet hole communicates with the mounting cavity and the interior of the shell, and the discharge port communicates with the mounting cavity and the exterior of the shell; An elastic member, disposed in the installation cavity; a blocking member, movably disposed in the installation cavity, the blocking member being used to block the air inlet hole under the action of the elastic member, and being used to open the air inlet hole under the action of the gas inside the shell; Wherein, along the thickness direction of the wall portion, the exposed surface is formed at one end of the valve body away from the electrode assembly.

14. The battery cell according to claim 13, wherein: The valve body comprises: A valve body is mounted on the wall portion, and the valve body is provided with the air inlet hole at one end close to the electrode assembly in the thickness direction of the wall portion; a valve cover, connected to one end of the valve body away from the electrode assembly along the thickness direction of the wall portion, the valve cover having a third surface away from the electrode assembly, the third surface including the exposed surface, the valve cover and the valve body jointly enclose the installation cavity, the valve cover and the blocking member are spaced apart, and two ends of the elastic member respectively abut against the valve cover and the blocking member; Wherein, the valve cover is provided with an air outlet, the air outlet is connected to the installation cavity, and the air outlet passes through one end of the third surface to form the discharge port; or A third exhaust gap is formed between the valve cover and the valve body, the third exhaust gap communicates with the mounting cavity, and the third exhaust gap forms the exhaust port at one end of the wall portion away from the electrode assembly in the thickness direction of the wall portion.

15. The battery cell according to claim 14, wherein: Along the thickness direction of the wall portion, the wall portion has a first surface away from the electrode assembly, and a mounting hole is provided on the wall portion, the mounting hole passes through the first surface, and at least a part of the valve body is mounted in the mounting hole; Wherein, the third surface is flush with the first surface.

16. The battery cell according to claim 15, wherein: Along the thickness direction of the wall portion, the valve body does not extend beyond the first surface.

17. The battery cell according to any one of claims 1 to 16, wherein: A bonding layer is provided on a side of the protective patch facing the wall portion, and the bonding layer bonds the protective patch and the wall portion; Wherein, a first avoidance hole is arranged at a position of the adhesive layer corresponding to the information collection hole, and along the thickness direction of the wall portion, projections of the information collection hole and the discharge port are both located in the first avoidance hole.

18. The battery cell according to any one of claims 1 to 17, 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.

19. A battery comprising the battery cell according to any one of claims 1 to 18.

20. An electrical device comprising the battery cell according to any one of claims 1 to 18, wherein the battery cell is used to provide electrical energy.

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