Battery monomer, battery and electric equipment

Abstract

The single battery comprises a shell and a one-way valve, the shell is provided with a wall part, the one-way valve comprises a valve body and a valve element, the valve body is arranged on the outer surface of the wall part, at least part of the valve body protrudes out of the outer surface of the wall part, a valve cavity is formed in the valve body, and the valve element is arranged in the valve cavity; the valve core is used for blocking the gas inlet of the valve cavity, and the valve core is configured to open the gas inlet under the action of the gas in the shell and release the gas in the battery monomers. Through the arrangement, gas in the shell can be exhausted out of the shell in time, so that the air pressure in the shell is not too high, the risk of opening a valve in advance of the pressure relief mechanism is reduced, and the service life of the single battery can be greatly prolonged.

Description

Technical Field

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

[0002] As global energy and environmental problems continue to intensify, new energy is developing rapidly as one of the areas of sustainable development. Batteries are increasingly widely used as a new energy source, and they have high requirements for reliability and service life. During the use of batteries in the process of charging and discharging, the internal pressure of the battery will increase due to the generation of gas inside the battery. In order to ensure the safety of the battery cell, a pressure relief mechanism for releasing the internal pressure of the battery cell is generally provided on the outer shell of the battery cell, so that when the internal pressure or temperature of the battery cell reaches a threshold, the pressure relief mechanism can be actuated and release the pressure inside the battery cell. However, the pressure relief mechanism of the existing battery cell may actuate the pressure relief in advance during use, resulting in poor stability in the use of the battery cell, which is not conducive to improving the service life and reliability of the battery cell. The above statements are only used to provide background technical information related to the present application, and do not necessarily constitute prior art. Utility Model Content

[0003] The main technical problem solved by the present application is to provide a battery cell, a battery and an electrical device, which can discharge the gas inside the battery casing to the outside of the casing in time, so that the gas pressure inside the battery casing will not be too high, reduce the risk of premature valve opening of the pressure relief mechanism, and greatly improve the battery life.

[0004] In order to solve the above technical problems, a technical solution adopted by the present application is: provide a battery cell, the battery cell includes a shell and a one-way valve, the shell has a wall portion, the wall portion has a first exhaust hole, the first exhaust hole connects the inside of the shell with the outside of the shell; the one-way valve includes a valve body and a valve core, the valve body has a valve cavity inside, the valve body is provided with an air inlet and an air outlet, the air inlet connects the valve cavity with the inside of the shell, and the air outlet connects the valve cavity with the outside of the shell; the valve core is arranged in the valve cavity, the valve core is used to block the air inlet, and the valve core is configured to open the air inlet under the action of the gas inside the shell and release the gas inside the battery cell; the wall portion has an outer surface and an inner surface arranged opposite to each other, the outer surface is arranged toward the outside of the shell, and the inner surface is arranged toward the inside of the shell; the valve body is arranged on the outer surface, and at least part of the valve body protrudes from the outer surface. Through this arrangement, the gas inside the battery shell can be discharged to the outside of the shell in time, so that the air pressure inside the battery shell is not too high.

[0005] In one embodiment, the valve body includes a valve seat and a valve cover, the valve cover includes a cover top wall and a cover side wall connected to the cover top wall, the cover top wall, the cover side wall and the valve seat enclose a valve cavity, the valve seat is provided with an air inlet of the valve cavity, and the valve cover is provided with an air outlet of the valve cavity. In this way, the gas is discharged easily.

[0006] In one embodiment, the valve seat has a first through hole penetrating the valve seat, and the gas inlet is the first through hole. In this way, the gas is easily discharged.

[0007] In one embodiment, the cover side wall has a second through hole penetrating the cover side wall, and the gas outlet is the second through hole. In this way, the gas is easily discharged.

[0008] In one embodiment, the second through hole extends to the end of the cover side wall in a direction away from the cover top wall; in this way, the discharge of gas is facilitated.

[0009] In one embodiment, there are a plurality of second through holes, and the plurality of second through holes are spaced apart and distributed in the circumferential direction of the side wall. In this way, the discharge of gas is facilitated.

[0010] In one embodiment, a first guide column is protruded on one side of the cover top wall facing the valve seat, a third through hole is provided on the cover top wall penetrating the cover top wall and the first guide column, or a third through hole is provided on the cover top wall penetrating the cover top wall, and the gas outlet is the third through hole. In this way, the gas discharge is facilitated.

[0011] In one embodiment, the valve cover further comprises a flange wall, the cover side wall connects the cover top wall and the flange wall, the flange wall extends toward a side away from the valve cavity relative to the cover side wall, and the flange wall is connected to the valve seat. In this way, the assembly of the one-way valve is facilitated.

[0012] In one embodiment, a first recessed groove is provided on the side of the valve seat facing the valve cover, and at least a portion of the flange wall is accommodated in the first recessed groove and connected to the valve seat. In this way, the installation height of the one-way valve can be reduced.

[0013] In one embodiment, the valve seat is provided with a first step surface and a second step surface on one side facing the valve cover, the first step surface is closer to the valve cover than the second step surface, and the first recess is provided on the first step surface. In this way, assembly stability can be improved.

[0014] In one embodiment, the surface of the flange wall facing the top wall of the cover is flush with the surface of the valve seat facing the valve cover; or the surface of the flange wall facing the top wall of the cover is lower than the surface of the valve seat facing the valve cover. In this way, the connection strength can be improved and the installation height of the one-way valve can be reduced.

[0015] In one embodiment, the flange wall is welded to the valve seat, wherein, in the circumferential direction of the cover side wall, at least a portion of the first weld mark between the flange wall and the valve seat is staggered with the second through hole on the cover side wall. In this way, the damage to the valve core component caused by the high temperature of the welding process can be reduced.

[0016] In one embodiment, the outer circumferential surface of the valve seat is provided with a connecting protrusion, and the inner circumferential surface of the flange wall is provided with a receiving groove, and the connecting protrusion is received in the receiving groove and connected to the flange wall. In this way, the connection strength can be improved and the installation height of the one-way valve can be reduced.

[0017] In one embodiment, the connecting protrusion is welded to the flange wall, wherein the flange wall has an upper surface and a lower surface disposed opposite to each other, the upper surface is disposed toward the top wall of the cover, and the second weld mark of the connecting protrusion and the flange wall is located on the lower surface of the flange wall. In this way, the damage to the valve core component caused by the high temperature of the welding process can be reduced.

[0018] In one embodiment, the valve body includes a valve cover, the valve cover includes a cover top wall and a cover side wall connected to the cover top wall, the cover top wall, the cover side wall and the wall portion enclose a valve cavity, the wall portion is provided with an air inlet of the valve cavity, and the cover side wall is provided with an air outlet of the valve cavity. In this way, the gas is discharged easily.

[0019] In one embodiment, a second recessed groove is provided on one side of the wall portion facing the outside of the housing, and the valve cover further comprises a flange wall, the cover side wall connects the cover top wall and the flange wall, the flange wall extends toward a side away from the valve cavity relative to the cover side wall, and at least a portion of the flange wall is accommodated in the second recessed groove and connected to the wall portion. In this way, the installation height of the one-way valve can be reduced.

[0020] In one embodiment, the valve core includes an elastic member and a blocking member, wherein the elastic member is disposed in the valve cavity; the blocking member is movably disposed in the valve cavity, and the blocking member is used to block the air inlet passage under the action of the elastic member, and is used to open the air inlet passage under the action of the gas inside the housing. In this way, the discharge of the gas can be facilitated.

[0021] In one embodiment, the valve body includes a valve cover and a valve seat, which form a valve cavity. A first guide column is protruding from the side of the valve cover facing the sealing member, and part of the elastic member is sleeved on the outside of the first guide column; in this way, the positioning and guiding of the elastic member can be achieved.

[0022] In one embodiment, the diameter of the first guide column is D1, and the inner diameter of the elastic member is D2, which satisfies 0mm<D2-D1≤5mm. In this way, the assembly of the elastic member and the first guide column can be facilitated.

[0023] In one embodiment, a second guide column is protruding from one side of the blocking member facing the valve cover, and a portion of the elastic member is sleeved on the outer side of the second guide column. In this way, the elastic member can be positioned and guided.

[0024] In one embodiment, the diameter of the second guide column is D3, and the inner diameter of the elastic member is D2, which satisfies 0mm<D3-D1≤5mm. In this way, the assembly of the elastic member and the second guide column can be facilitated.

[0025] In one embodiment, in the axial direction of the elastic member, there is a gap between the end surface of the first guide column away from the valve cover and the end surface of the second guide column close to the valve cover; the height H1 of the gap satisfies 0mm

[0026] In one embodiment, in the axial direction of the valve cavity, the two ends of the elastic member respectively abut against the valve cover and the blocking member, the distance between the first abutting surface of the valve cover and the second abutting surface of the blocking member is L1, and the physical length of the elastic member is L2, satisfying L1>L2, wherein the physical length of the elastic member is the physical length of the elastic member after the elastic member is fully compressed; optionally, L1-L2>0.5mm. In this way, compression space of the elastic member can be reserved to drive the blocking member to block / open the air inlet channel.

[0027] In one embodiment, the elastic member is a spring, and the physical length L2 of the elastic member is L2 = d1*n1+d2+d3, wherein d1 is the spring wire diameter, n1 is the maximum number of turns of the spring in the axial direction, d2 is the thickness of the outermost spring at one end of the spring, and d3 is the thickness of the outermost spring at the other end of the spring, and d2≤d1, d3≤d1.

[0028] In one embodiment, the outer circumferential surface of the blocking member is provided with a plurality of limiting protrusions, and the plurality of limiting protrusions are arranged at intervals along the circumference of the blocking member. In this way, the blocking member can be guided and limited to improve the stability of the movement of the blocking member.

[0029] In one embodiment, the blocking member includes a pressing portion and a sealing portion, and along the thickness direction of the wall portion, two ends of the elastic member are respectively against the valve cover and the pressing portion, and the sealing portion is connected to a side of the pressing portion away from the valve cover, and the sealing portion is used to block the air inlet passage. In this way, it is beneficial to maintain the sealing performance of the housing.

[0030] In one embodiment, the sealing portion is made of EPDM, fluororubber or Teflon.

[0031] In one embodiment, the elastic member is made of steel, iron or aluminum. ​

[0032] In one embodiment, the valve cover includes a cover side wall, the cover side wall has a second through hole penetrating the cover side wall, the gas outlet is the second through hole, and along the axial direction of the valve cavity, the sealing interface between the valve core and the valve seat is higher than or flush with the bottom wall of the second through hole. In this way, the gas can be discharged easily.

[0033] In one embodiment, the wall portion is provided with a first exhaust hole, and the one-way valve is at least partially accommodated in the first exhaust hole.

[0034] In one embodiment, the first exhaust hole includes a through hole section and a first hole section, the through hole section and the first hole section are arranged along the thickness direction of the wall portion, the through hole section connects the inside of the shell with the outside of the shell, the first hole section is located on the side of the through hole section away from the inside of the shell, the aperture of the first hole section is larger than the aperture of the through hole section, the one-way valve is at least partially accommodated in the first hole section, the valve body of the one-way valve faces the outside of the shell and at least part of the valve body protrudes from the outer surface of the wall portion. In this way, the assembly of the one-way valve can be facilitated.

[0035] In one embodiment, the first hole section includes a hole side surface arranged circumferentially, and the outer peripheral surface of the valve cover / valve seat of the one-way valve is welded to the hole side surface, so as to improve the connection strength.

[0036] In one embodiment, the valve seat is provided with a first step surface and a second step surface on one side facing the valve cover, the first step surface is closer to the valve cover than the second step surface, and the outer peripheral surface of the second step is welded to the side surface of the hole. In this way, the assembly stability can be improved.

[0037] In one embodiment, the hole side surface matches the outer peripheral surface of the valve cover / valve seat of the one-way valve, and the hole side wall surface and the outer peripheral surface of the valve cover / valve seat of the one-way valve are both arranged at an acute angle to the central axis of the first exhaust hole, thereby improving the connection strength.

[0038] In one embodiment, a stress relief groove is provided around the weld mark between the valve cover / valve seat and the wall; optionally, a first stress relief groove is provided on a surface of the valve seat / valve cover facing the outside of the housing; and / or a second stress relief groove is provided on a surface of the wall facing the outside of the housing. In this way, the stability of the connection can be improved.

[0039] In one embodiment, a weak zone is provided on the valve body, so that when the pressure inside the battery cell is too high, the valve body can be broken at the weak zone to quickly discharge the gas inside the battery cell.

[0040] In one embodiment, the strength weak area includes a thickness weak area. This arrangement is helpful to simplify the preparation process.

[0041] In one embodiment, the valve body includes a valve cover, the valve cover includes a cover top wall and a cover side wall connected to the cover top wall, and the thickness weakened area includes a groove arranged on the cover side wall. Through this arrangement, the damage to the battery housing caused by the breakage of the valve body can be reduced.

[0042] In one embodiment, the cover side wall has a second through hole penetrating the cover side wall, and the groove is arranged on the connecting arm between two adjacent second through holes. This arrangement is conducive to simplifying the preparation process.

[0043] In one embodiment, the groove is located on the side of the cover sidewall facing the valve cavity; or the groove is located on the side of the cover sidewall away from the valve cavity. This arrangement is conducive to simplifying the preparation process.

[0044] In one embodiment, the thickness weakened area includes a first notch groove, which is a circumferential groove on the side wall of the cover. With this arrangement, when the pressure inside the battery cell is too high, the valve body can be broken faster to achieve the effect of quickly discharging the gas inside the battery cell.

[0045] In one embodiment, the thickness weakened area includes a plurality of second notched grooves, and the plurality of second notched grooves are arranged at intervals in the circumferential direction of the cover side wall. This arrangement is conducive to simplifying the manufacturing process.

[0046] In one embodiment, the battery cell further comprises an insulating member, which is arranged on the side of the wall portion facing the inside of the housing; a second exhaust hole penetrating the insulating member is arranged on the insulating member, and the second exhaust hole is connected to the first exhaust hole on the wall portion. In this way, the exhaust of gas can be facilitated.

[0047] In one embodiment, the wall is provided with a first exhaust hole, at least part of the one-way valve is installed in the first exhaust hole, and the first exhaust hole is the injection hole of the battery cell. Or the first exhaust hole and the injection hole are arranged at intervals. In this way, the one-way valve is used to replace the sealing structure of the original injection hole, which can help simplify the structure of the battery cell.

[0048] In one embodiment, the housing includes a shell and an end cap, wherein a receiving cavity with an opening is formed inside the shell, and the receiving cavity is used to receive the electrode assembly; the end cap closes the opening; wherein the end cap is a wall; or the shell includes a wall; or the wall is a wall located at the top of the housing when the battery cell is in a placed state. In this way, the gas can be discharged easily.

[0049] In one embodiment, the battery cell further includes a pressure relief mechanism, which is disposed on the housing and is configured to actuate and release the internal pressure of the battery cell when the battery cell is in thermal runaway, and the actuation pressure of the pressure relief mechanism is greater than the opening pressure of the one-way valve. In this way, the safety of the battery can be improved.

[0050] In one embodiment, the wall has a pressure relief hole, which connects the inside of the shell with the outside of the shell, and is connected to the pressure relief mechanism; the diameter of the pressure relief hole is larger than the diameter of the first exhaust hole. In this way, the pressure relief capacity of the battery cell is improved.

[0051] In one embodiment, the exhaust rate of the one-way valve is lower than the exhaust rate of the pressure relief mechanism. In this way, the pressure relief capability of the battery cell is improved.

[0052] In one embodiment, the opening pressure of the one-way valve is greater than or equal to 0.2 MPa; optionally, greater than or equal to 0.4 MPa, which is beneficial for regulating the internal pressure of the battery cell.

[0053] In one embodiment, a weak strength area is provided on the valve body, the actuation pressure of the pressure relief mechanism is greater than the actuation pressure of the weak strength area, and the actuation pressure of the weak strength area is greater than the opening pressure of the one-way valve. In this way, the pressure relief capacity of the battery cell is improved.

[0054] In one embodiment, the aperture of the air inlet is greater than or equal to the aperture of the first exhaust hole. In this way, the pressure relief capability of the battery cell is improved.

[0055] In order to solve the above technical problems, another technical solution adopted by the present application is to provide a battery, the battery comprising the above battery monomer. The battery has at least the same advantages as the battery monomer.

[0056] In order to solve the above technical problems, another technical solution adopted by the present application is to provide an electric device, which includes the above battery. The electric device has at least the same advantages as the battery.

[0057] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0059] Figure 1 is a schematic diagram of an exploded structure of a battery cell according to one or more embodiments;

[0060] Figure 2 is a schematic cross-sectional structure diagram of a one-way valve according to one or more embodiments;

[0061] Figure 3a is a schematic structural diagram of a blocking member of a one-way valve according to one or more embodiments;

[0062] Figure 3b is a schematic cross-sectional structure diagram of a one-way valve according to one or more embodiments;

[0063] Figure 3c is a schematic diagram of a state of an elastic member according to one or more embodiments;

[0064] Figure 4 is a schematic diagram of an exploded structure of a one-way valve according to one or more embodiments;

[0065] Figure 5 is a front view of a one-way valve according to one or more embodiments;

[0066] Figure 6 is a schematic diagram of a partial cross-sectional structure of a battery cell according to one or more embodiments;

[0067] Figure 7 is a schematic cross-sectional structure diagram of a one-way valve according to one or more embodiments;

[0068] Figure 8 is a front view of a one-way valve according to one or more embodiments;

[0069] Fig. 9 is a bottom view of a one-way valve according to one or more embodiments;

[0070] Fig.10 is a schematic diagram of an exploded structure of a one-way valve according to one or more embodiments;

[0071] Fig.11 is a schematic diagram of a partial cross-sectional structure of a battery cell according to one or more embodiments;

[0072] Fig.12 is a schematic diagram of a partial cross-sectional structure of a battery cell according to one or more embodiments;

[0073] Fig.13 is a schematic diagram of a partial cross-sectional structure of an end cap according to one or more embodiments;

[0074] Fig.14 is a front view of an end cover of a battery cell according to one or more embodiments;

[0075] Fig.15 is a schematic diagram of a partial exploded structure of a battery cell according to one or more embodiments;

[0076] Fig.16 is a front view of a one-way valve according to one or more embodiments;

[0077] Fig.17 is a schematic diagram of an exploded structure of a one-way valve according to one or more embodiments;

[0078] Fig.18 is a schematic cross-sectional structure diagram of a one-way valve according to one or more embodiments;

[0079] Fig.19 is a state schematic diagram of a one-way valve according to one or more embodiments;

[0080] Fig. 20 is a front view of an end cover of a battery cell according to one or more embodiments;

[0081] Fig.21 is a schematic diagram of a partial exploded structure of a battery cell according to one or more embodiments;

[0082] Fig. 22 is a schematic diagram of an exploded structure of a battery cell according to one or more embodiments;

[0083] Fig.23 is a schematic diagram of an exploded structure of a battery according to one or more embodiments;

[0084] Fig.24 is a schematic diagram of the structure of a vehicle according to one or more embodiments.

[0085] In the attached figure:

[0086] 1000, vehicle; 300, motor; 200, controller; 100, battery; 10, housing; 11, first part; 12, second part; 20, battery cell; 21, end cap; 21a, outer surface; 21b, inner surface; 291, first vent hole; 22, housing; 23, electrode assembly; 24, insulating member; 292, second vent hole; 25, electrode terminal; 280, through hole section; 281, first hole section; 30, one-way valve; 31, valve body; 311, valve seat; 3111, first through hole; 3112, first sink; 3113, connecting protrusion; 3119, weak strength area; 312, valve cover; 3121, cover top wall; 31211, first guide column; 31212, third through hole; 3122, cover Side wall; 3122a, solid area; 3122b, exhaust area; 31221, second through hole; 31222, flange wall; 31222a, connecting surface; 31222b, accommodating groove; 31222c, upper surface; 31222d, lower surface; 313, valve cavity; 313a, air inlet; 313b, air outlet; 32, valve core; 321, blocking member; 3211, sealing part; 3212, pressing part; 3212a, limiting protrusion; 3212b, second guide column; 322, elastic member; 60, protective patch; 601, first avoidance hole; 602, second avoidance hole; 603, third avoidance hole; 70, pressure relief mechanism; 701, pressure relief hole; W1, first weld mark; W2, second weld mark; W3, third weld mark. DETAILED DESCRIPTION

[0087] In order to make the purpose, technical solution and effect of the present application clearer and more specific, the following will describe the embodiments of the technical solution of the present application in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0088] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0089] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces), unless otherwise clearly and specifically defined.

[0090] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0091] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0092] Amounts, ratios and other numerical values ​​are presented herein in a range format. It should be understood that such a range format is for convenience and brevity and should be flexibly interpreted to include not only the values ​​explicitly specified as range limits, but also all individual values ​​or sub-ranges encompassed within the range, as if each value and sub-range were explicitly specified.

[0093] In the description of the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0094] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0095] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0096] Batteries are widely used in the field of new energy, mainly including electric vehicles, energy storage systems and renewable energy. In the field of electric vehicles, higher performance such as longer driving range and fast charging are gradually achieved. In terms of energy storage systems, batteries are widely used in large-scale and distributed energy storage. They can balance the load of the grid, store renewable energy such as solar and wind power, and release the stored energy during peak hours. In addition, small rechargeable batteries are also widely used in applications such as wearable devices, drones and smart homes.

[0097] As the battery is charged and discharged, some side reactions will produce gas. If the gas produced by the battery is not discharged in time, the internal pressure of the battery will increase. Excessive internal pressure will have a negative impact on the performance and appearance of the battery. For example, in severe cases, it will have a destructive effect on the performance and appearance of the battery, such as leakage, bulging, increased internal resistance of the battery, and shortened discharge time and cycle life. In addition, there are some abnormal operations of the battery during use, including overcharging, over-discharging, internal failure, etc. In this case, the chemical reaction inside the battery may be uncontrolled, accompanied by violent release of gas, and even cause thermal runaway of the battery. Battery thermal runaway refers to a chain reaction phenomenon caused by various inducements. The large amount of heat and harmful gases emitted by thermal runaway can cause the battery to catch fire and explode.

[0098] In order to improve the safety of battery cells, a pressure relief mechanism is usually provided on the outer shell of the battery cell to release the internal pressure of the battery cell through the pressure relief mechanism, thereby effectively improving the safety of the battery cell. However, the instability of the internal pressure during the use of the battery cell may cause the pressure relief mechanism of the battery cell to be activated and release pressure in advance, resulting in poor stability in the use of the battery cell, which is not conducive to improving the service life and reliability of the battery cell.

[0099] Based on the above considerations, an embodiment of the present application provides a battery cell, on which a one-way valve is provided. The one-way valve can be used to discharge the gas inside the battery cell in time to maintain a stable internal pressure of the battery cell.

[0100] Please refer to Figure 1 , Figure 1FIG. 2 is a schematic diagram of an exploded structure of a battery cell 20 according to one or more embodiments. The battery cell 20 is the smallest unit constituting the battery 100. Figure 1 The battery cell 20 includes an end cover 21, a shell 22, an electrode assembly 23 and other functional components.

[0101] The end cap 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 25 can be provided on the end cap 21. The electrode terminal 25 can be used to electrically connect with the electrode assembly 23 for outputting or inputting the electrical energy of the battery cell 20. Exemplarily, the battery cell 20 is provided with two electrode terminals 25, and the two electrode terminals 25 are both installed on the end cap 21, and the two electrode terminals 25 are respectively used to electrically connect with the two pole ears of opposite polarity of the electrode assembly 23 to realize the output or input of the positive and negative electrodes of the battery cell 20 respectively. In some embodiments, the end cap 21 may also be provided with a pressure relief mechanism 70 for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The material of the end cap 21 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating member 24 may also be provided on the inner side of the end cap 21, and the insulating member 24 may be used to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. Exemplarily, the insulating member 24 may be plastic, rubber, etc.

[0102] The shell 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte and other components. The shell 22 and the end cap 21 can be independent components, and an opening can be set on the shell 22, and the internal environment of the battery cell 20 is formed by covering the opening with the end cap 21 at the opening. Without limitation, the end cap 21 and the shell 22 can also be integrated. Specifically, the end cap 21 and the shell 22 can form a common connection surface 31222a before other components are put into the shell, and when the interior of the shell 22 needs to be encapsulated, the end cap 21 covers the shell 22. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0103] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be included in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 23, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 100, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminals 25 to form a current loop.

[0104] Please refer to Fig.14 , Fig.14 Schematic diagram of a partial exploded structure of a battery cell 20 according to one or more embodiments. According to some embodiments of the present application, the present application discloses a battery cell 20, which includes a shell and a one-way valve 30, wherein the shell has a wall portion, and the one-way valve 30 is disposed on the wall portion, and the one-way valve 30 is used to discharge gas inside the shell.

[0105] In a battery cell 20 of this structure, a one-way valve 30 is provided on the wall of the outer shell so that the one-way valve 30 can discharge the gas inside the outer shell to the outside of the outer shell. Therefore, when gas is generated inside the outer shell during normal use of the battery cell 20, it can be discharged to the outside of the outer shell through the one-way valve 30, 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 of the internal air pressure of the battery cell 20, thereby causing the battery cell 20 to actuate and release pressure in advance, thereby effectively improving the use stability of the battery cell 20, so as to improve the service life and use reliability of the battery cell 20.

[0106] According to some embodiments of the present application, the outer shell includes an end cover 21 and a shell 22, and the wall portion may be a wall of the end cover 21 or a wall of the shell 22. That is, the one-way valve 30 may be arranged on the end cover 21 or on the shell 22. In other words, the wall portion for mounting the one-way valve 30 may be the end cover 21 of the outer shell or a wall of the shell 22 of the outer shell. Exemplarily, the wall portion is the end cover 21. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the wall portion may also be a bottom wall of the shell 22 and the end cover 21, and the wall portion may also be a side wall of the shell 22 and the end cover 21 that are adjacent to and connected to each other. The following will take the wall portion as the wall of the end cover 21 as an example to illustrate the present application, but this should not limit the present application.

[0107] According to some embodiments of the present application, the one-way valve 30 is configured to actuate and release the gas inside the battery cell 20 when the gas pressure inside the battery cell 20 reaches a threshold value. In other words, the one-way valve 30 is used to exhaust the gas inside the shell, that is, the one-way valve 30 can be opened in one direction to exhaust gas, so that the gas inside the shell can be discharged to the outside of the shell through the one-way valve 30.

[0108] Please refer to Figure 2 , Figure 2 Schematic diagram of the cross-sectional structure of the one-way valve 30 according to one or more embodiments. According to some embodiments of the present application, the one-way valve 30 includes a valve body 31 and a valve core 32. The valve body 31 has a valve cavity 313 inside. The valve body 31 is provided with an air inlet 313a and an air outlet 313b. The air inlet 313a connects the valve cavity 313 with the inside of the shell, and the air outlet 313b connects the valve cavity 313 with the outside of the shell. The valve core 32 is arranged in the valve cavity 313. The valve core 32 is used to block the air inlet 313a of the valve cavity 313. The valve core 32 is configured to open the air inlet 313a under the action of the gas inside the shell and release the gas inside the battery cell 20.

[0109] Among them, the air inlet 313a is used to connect the valve cavity 313 and the interior of the shell, that is, the gas inside the shell can enter the valve cavity 313 through the air inlet 313a; the air outlet 313b is used to connect the valve cavity 313 and the outside of the shell, that is, the gas in the valve cavity 313 can be discharged to the outside of the shell through the air outlet 313b; through this arrangement, the gas inside the shell of the battery cell 20 can be discharged to the outside of the shell through the valve cavity 313.

[0110] Specifically, when the gas inside the battery cell 20 shell is discharged through the one-way valve 30, its discharge path is the inside of the battery cell 20 - the air inlet 313a - the valve cavity 313 - the air outlet 313b - the outside of the battery cell 20, and the entire exhaust path constitutes an exhaust channel; Figure 2 In the path from A to B shown in (b), A is the inner side of the shell, and B is the outer side of the shell. That is, the gas inside the shell of the battery cell 20 enters the valve cavity 313 from the air inlet 313a, flows through the valve cavity 313, and is discharged from the air outlet 313b of the valve cavity 313 to the outside of the battery 100 shell.

[0111] Furthermore, the valve core 32 is used to block the air inlet channel of the valve cavity 313, and is used to open the air inlet channel under the action of the gas inside the shell. The air inlet channel is the channel through which the gas inside the shell enters the valve cavity 313 and flows after entering the valve cavity 313, or the air inlet channel can be a part of the exhaust channel, more specifically, the partial path before the air outlet 313b of the exhaust channel. The valve core 32 blocks the air inlet channel, which means that the gas is not allowed to enter the valve cavity 313, or the gas is allowed to enter the valve cavity 313, but the gas is not allowed to flow out of the valve cavity 313. The valve core 32 can directly block the air inlet 313a, not allowing the gas to enter the valve cavity 313; or it can block the flow path of the gas, that is, the gas can enter the valve cavity 313 through the air inlet 313a, but its flow path is blocked and cannot continue to flow to the air outlet 313b. When the valve core 32 blocks the air inlet passage, the gas outside the shell cannot enter the inside of the shell, and the gas inside the shell cannot be discharged from the outside of the shell. When the pressure of the gas inside the shell reaches a certain threshold, the gas inside the shell can push the valve core 32 to open the air inlet passage, so that the gas inside the shell can enter the valve cavity 313 and then be discharged from the outside of the shell through the gas outlet 313b. At the same time, the valve core 32 is only allowed to be opened in one direction by applying pressure from one side inside the shell, allowing gas to flow out, but cannot be reversely opened from the side outside the shell.

[0112] Optionally, the structure of the valve core 32 can be various, for example, Figure 2 In the embodiment, the valve core 32 may include an elastic member 322 and a blocking member 321, both of which are disposed in the valve cavity 313, and the elastic member 322 is configured to provide elastic force to the blocking member 321, and the sealing and opening of the valve cavity 313 are achieved by deformation of the elastic member 322. Specifically, the elastic member 322 is disposed in the valve cavity 313, and the blocking member 321 is movably disposed in the valve cavity 313, and the blocking member 321 is used to block the air inlet channel under the action of the elastic member 322, and is used to open the air inlet 313a under the action of the gas inside the shell.

[0113] Among them, the blocking member 321 is movably arranged in the valve cavity 313, that is, the blocking member 321 can move in the valve cavity 313, so that the blocking member 321 can block the air inlet 313a when it moves close to the air inlet 313a, and conversely, the blocking member 321 can open the air inlet 313a when it moves away from the air inlet 313a.

[0114] In some embodiments, the blocking member 321 is gap-matched with the inner wall of the valve cavity 313 .

[0115] Exemplarily, the air inlet 313a penetrates the bottom surface of the valve cavity 313, and correspondingly, the blocking member 321 is movably disposed in the valve cavity 313 along the axial direction of the valve cavity 313 (the Y direction shown in the figure), so that the blocking member 321 can block the air inlet 313a when it abuts against the bottom surface of the valve cavity 313. Of course, in other embodiments, the air inlet 313a can also be disposed on one side of the valve body 31 in the radial direction of the valve body 31, and correspondingly, the blocking member 321 is movably disposed in the valve cavity 313 along the radial direction of the valve body 31.

[0116] The blocking member 321 is used to block the air inlet 313a under the action of the elastic member 322, and is used to open the air inlet 313a under the action of the gas inside the shell. That is to say, the elastic member 322 can provide elastic force for the blocking member 321, so that the blocking member 321 can abut against the bottom surface of the valve cavity 313 to block the air inlet 313a. Conversely, when the force of the gas inside the shell acting on the blocking member 321 is greater than the elastic force of the elastic member 322, the gas inside the shell can overcome the elastic force of the elastic member 322 and push the blocking member 321 to separate from the bottom surface of the valve cavity 313, so as to enable the blocking member 321 to open the air inlet 313a, so that the gas inside the shell can enter the valve cavity 313 through the air inlet 313a and then be discharged through the air outlet 313b.

[0117] like Figure 2 As shown in Figure 2 (a) is a schematic diagram of the one-way valve 30 in a non-opening state; Figure 2 (b) is a schematic diagram of the one-way valve 30 in the open state. The elastic member 322 provides an elastic force F1 to the blocking member 321, and the blocking member 321 is pressed to block the air inlet 313a. When the force F2 of the gas inside the shell acting on the blocking member 321 is greater than the elastic force F1 of the elastic member 322, the gas inside the shell can overcome the elastic force of the elastic member 322 and push the blocking member 321 to open the air inlet 313a, so as to allow the gas inside the shell to enter the valve cavity 313 and then be discharged to the outside of the shell through the air outlet 313b. On the contrary, after the gas inside the shell is discharged and the force F2 of the gas inside the shell acting on the blocking member 321 is less than the elastic force F1 of the elastic member 322, the elastic member 322 can drive the blocking member 321 to reset to block the air inlet 313a.

[0118] Optionally, the elastic member 322 is an elastic member, and its structure can be various, such as a spring, a spring or an elastic rubber. Exemplarily, the elastic member 322 is a spring. Using a spring as the elastic member 322 disposed in the valve cavity 313 is, on the one hand, convenient for assembling the elastic member 322, which is conducive to reducing the difficulty of assembling the elastic member 322 in the valve cavity 313, and on the other hand, it can achieve a more stable direction in which the elastic force applied by the elastic member 322 to the blocking member 321. In some embodiments, the material of the elastic member 322 includes steel, iron or aluminum. The elastic member 322 made of steel, iron or aluminum has good toughness, and can alleviate the phenomenon of elastic failure of the elastic member 322, which is conducive to improving the service life of the elastic member 322.

[0119] Exemplarily, the elastic member 322 is a spring, and the sealing and opening of the valve cavity 313 are achieved by deformation of the spring. When the valve cavity 313 is sealed: the initial length of the spring can be set to L0, and the initial length is the natural length of the spring before it is compressed; the assembly space of the spring in the valve cavity 313 is L1, and the valve cavity 313 is configured to achieve L0>L1. After assembly, the spring is compressed, thereby achieving a pressing force F1 on the blocking member 321, so that the blocking member 321 is tightly fitted with the wall of the valve cavity 313 to achieve a sealing effect.

[0120] When the air pressure inside the shell increases to a certain value P1, the air pressure applies a force F2 to the lower surface 31222d of the blocking member 321. When F2 is greater than the spring compression force F1, the sealing interface fails, and the gas inside the shell enters the valve cavity 313 and is discharged to the outside of the shell through the channel in the valve cavity 313. As the gas inside the shell is discharged, the internal air pressure decreases. When the air pressure reaches a certain value P2, the valve body 31 is closed to achieve sealing. The valve body 31 can be repeatedly opened and closed to exhaust air, so that the air pressure inside the shell is maintained between P1-P2, thereby preventing the pressure relief mechanism 70 from opening the valve prematurely due to excessive air pressure inside the shell.

[0121] Please refer to Figure 2 , Figure 3a and Figure 3b , Figure 3a is a schematic structural diagram of a blocking member 321 of a one-way valve 30 according to one or more embodiments; Figure 3b Schematic diagram of the cross-sectional structure of the one-way valve 30 according to one or more embodiments. According to some embodiments of the present application, the elastic member 322 is arranged along the axial direction Y of the valve cavity 313, and the two ends of the elastic member 322 are respectively abutted against the blocking member 321 and the cavity top surface of the valve cavity 313, and the elastic member 322 is in a compressed state and is located between the cavity top surface of the valve cavity 313 and the blocking member 321, so that the elastic member 322 can apply elastic force to the blocking member 321, so that the blocking member 321 can abut against the cavity bottom surface of the valve cavity 313 to block the air inlet 313a.

[0122] Furthermore, a plurality of limiting protrusions 3212 a may be provided on the outer circumferential surface of the blocking member 321 . The plurality of limiting protrusions 3212 a are arranged at intervals along the circumference of the blocking member 321 . The limiting protrusions 3212 a cooperate with the side surface guides of the valve cavity 313 .

[0123] Among them, the limiting protrusion 3212a cooperates with the side surface of the valve cavity 313 for guiding, that is, the limiting protrusion 3212a is used to cooperate with the cavity wall surface of the valve cavity 313 when the blocking member 321 moves along the axial direction of the valve cavity 313, so as to play a guiding and limiting role. Of course, in other embodiments, the one-way valve 30 can also be other structures. For example, the cavity side surface of the valve cavity 313 is provided with a guide groove (not shown) extending along the axial direction of the valve cavity 313, and the limiting protrusion 3212a extends into the guide groove. The limiting protrusion 3212a can move in the guide groove along the axial direction of the valve cavity 313 when the blocking member 321 opens the air inlet 313a, so as to play a guiding and limiting role. A plurality of guide grooves can be provided, and the plurality of guide grooves respectively cooperate with the plurality of limiting protrusions 3212a. Optionally, the limiting protrusion 3212a can have a variety of shapes, such as semicircular, triangular, trapezoidal or rectangular structures. For example, in Figure 3a In the embodiment, the limiting protrusion 3212a is in a semicircular shape.

[0124] By providing a plurality of spaced-apart limiting protrusions 3212a on the outer peripheral surface of the blocking member 321, and the limiting protrusions 3212a cooperate with the side surfaces of the valve cavity 313 for guiding, the blocking member 321 can be guided and limited by the cooperation between the limiting protrusions 3212a and the side surfaces of the valve cavity 313 when the blocking member 321 moves along the axial direction of the valve cavity 313, so as to improve the stability of the movement of the blocking member 321.

[0125] Please refer to Figure 2 , Figure 3b and Figure 4 , Figure 4 : is a schematic diagram of the exploded structure of the one-way valve 30 according to one or more embodiments. The valve body 31 includes a valve seat 311 and a valve cover 312. The valve cover 312 and the valve seat 311 enclose a valve cavity 313. The two ends of the elastic member 322 are respectively in contact with the blocking member 321 and the cover top wall 3121 of the valve cover 312. Among them, a first guide column 31211 can be protruded on the side of the cover top wall 3121 facing the blocking member 321, and part of the elastic member 322 is sleeved on the outside of the first guide column 31211 to achieve the positioning of the elastic member 322.

[0126] Furthermore, the blocking member 321 includes a clamping portion 3212 and a sealing portion 3211, the two ends of the elastic member 322 respectively abut against the valve cover 312 and the clamping portion 3212, the sealing portion 3211 is connected to the side of the clamping portion 3212 away from the valve cover 312, and the sealing portion 3211 is used to seal the air inlet 313a. The rigidity of the pressing portion 3212 is greater than that of the sealing portion 3211. The sealing portion 3211 is connected to the side of the pressing portion 3212 away from the cover top wall 3121. The sealing portion 3211 is used to block the air inlet 313a. The elastic member 322 is arranged between the cover top wall 3121 and the pressing portion 3212. The pressing portion 3212 can be pressed against the sealing portion 3211 under the elastic force of the elastic member 322, so that the upper surface 31222c of the sealing portion 3211 is effectively in contact with the pressing portion 3212, so that the sealing portion 3211 is against the bottom surface of the valve cavity 313, thereby blocking the air inlet 313a through the sealing portion 3211.

[0127] According to some embodiments of the present application, the rigidity of the pressing portion 3212 is greater than the rigidity of the sealing portion 3211, and the setting of the pressing portion 3212 can effectively transmit the force applied by the elastic member 322 to the sealing portion 3211. In other words, the rigidity of the pressing portion 3212 is greater than the rigidity of the sealing portion 3211, that is, the deformation resistance of the pressing portion 3212 is greater than the deformation resistance of the sealing portion 3211, so that the pressing portion 3212 can better press the sealing portion 3211 on the bottom surface of the installation cavity to block the air inlet 313a. Exemplarily, the material of the pressing portion 3212 can be various, such as steel, iron or aluminum. Similarly, the material of the sealing portion 3211 can also be various, such as rubber, silicone or plastic.

[0128] Optionally, the connection structure between the pressing portion 3212 and the sealing portion 3211 may be various, such as clamping, bolting, or bonding.

[0129] By configuring the blocking member 321 to include a clamping portion 3212 and a sealing portion 3211, the clamping portion 3212 is disposed on the side of the sealing portion 3211 facing the valve cover 312, the sealing portion 3211 is used to block the air inlet 313a, and the two ends of the elastic member 322 respectively abut against the valve cover 312 and the clamping portion 3212, so that the elastic member 322 can exert an elastic force on the sealing portion 3211 through the clamping portion 3212, which is beneficial to improving the balance of the elastic force of the elastic member 322 acting on the sealing portion 3211, and further can effectively improve the sealing effect of the sealing portion 3211 on the air inlet 313a.

[0130] According to some embodiments of the present application, the material of the sealing portion 3211 is selected to be resistant to electrolyte, such as fluororubber, PFA, EPDM, etc. Different sealing materials have different physical properties, and the forces required to achieve sealing are also different accordingly.

[0131] Exemplarily, the limiting protrusion 3212a is convexly arranged on the outer peripheral surface of the pressing portion 3212. Of course, in other embodiments, the blocking member 321 can also be a sealing component as a whole, such as a rubber pad or a silicone pad, that is, the blocking member 321 only includes the sealing portion 3211, and the two ends of the elastic member 322 are respectively against the valve cover 312 and the sealing portion 3211. Of course, in other embodiments, the valve core 32 can also be an elastic component as a whole, such as elastic rubber.

[0132] Similarly, a second guide column 3212 b may be protruded from the side of the pressing portion 3212 facing the cover top wall 3121 , and a portion of the elastic member 322 is sleeved on the outer side of the second guide column 3212 b .

[0133] The one-way valve 30 adopting this structure can play a certain positioning role on the elastic member 322 through the first guide column 31211 and the second guide column 3212b, so as to facilitate the assembly of the elastic member 322, which is conducive to reducing the difficulty of assembling the elastic member 322. On the other hand, the first guide column 31211 and the second guide column 3212b can play a certain guiding role when the elastic member 322 is compressed, so as to reduce the radial deformation of the elastic member 322 during the compression process, so that the elastic member 322 can be stably compressed, which is conducive to improving the reliability of the use of the elastic member 322, and further can reduce the risk of the blocking member 321 accidentally opening the air inlet 313a. The elastic member 322 can be a spring. Of course, in other embodiments, the elastic member 322 can also be a spring or elastic rubber.

[0134] Please refer to Figure 3b and Figure 3c , Figure 3c Schematic diagram of the state of the elastic member 322 according to one or more embodiments. According to some embodiments of the present application, the two ends of the elastic member 322 are respectively in contact with the side surface of the valve cover 312 facing the valve cavity 313 and the side surface of the pressing portion 3212 facing the valve cover 312, and the distance between the two is the assembly space L1 of the elastic member 322. Specifically, the cover top wall 3121 has a side surface 3121a facing the valve cavity 313, and the pressing portion 3212 has a side surface 3212c facing the cover top wall 3121, and L1 is the distance between the surface 3121a and the surface 3212c.

[0135] According to some embodiments of the present application, along the axial direction Y of the valve cavity 313 , the size of the gap between the valve cover 312 and the blocking member 321 is H1 , satisfying 0 mm

[0136] A first guide post 31211 is convexly provided on the side of the valve cover 312 facing the plugging member 321, and a second guide post 3212b is convexly provided on the side of the plugging member 321 facing the valve cover 312. The gap between the valve cover 312 and the plugging member 321 is the gap between the end face of the first guide post 31211 away from the valve cover 312 and the end face of the second guide post 3212b close to the valve cover 312. Figure 3b In other words, in the axial direction Y of the valve cavity 313, the sum of the height H2 of the first guide column 31211 and the height H3 of the second guide column 3212b is less than the assembly space L of the elastic member 322, that is, in the axial direction, the height H2 of the first guide column 31211 + the height H3 of the second guide column 3212b < the spring compression space L1.

[0137] Exemplarily, the size H1 of the gap between the valve cover 312 and the blocking member 321 may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc.

[0138] By setting the size of the gap between the valve cover 312 and the sealing member 321 in the axial direction Y to be greater than 0 mm and less than or equal to 5 mm, on the one hand, the obstruction of the valve cover 312 to the sealing member 321 can be reduced, so that there is space between the valve cover 312 and the sealing member 321 for the sealing member 321 to move along the axial direction Y, so that when the gas inside the shell pushes the sealing member 321, the sealing member 321 can open the air inlet 313a for exhaust. On the other hand, the phenomenon that the one-way valve 30 occupies too much space in the axial direction Y due to the excessive gap between the valve cover 312 and the sealing member 321 can be alleviated, which is beneficial to improving the space utilization rate of the battery cell 20.

[0139] like Figure 3c As shown, taking the elastic member 322 as a spring as an example, the initial length L0 of the spring is the natural length of the spring before being compressed; by configuring L0>L1, the spring can have a certain initial elastic force after being assembled into the valve cavity 313, so as to push the sealing part 3211 to be pressed against the wall of the valve cavity 313, thereby improving the sealing performance.

[0140] Furthermore, the physical length L2 of the spring is configured so that L1>L2. The physical length of the spring is the length of the main body of the spring after the spring is fully compressed. Figure 3c As shown, Figure 3c State 1 in the figure is the state where the spring is not compressed. In this state, there is a gap between the entity structures of the spring and it can be further compressed. Figure 3c ​State 2 in the figure is the state after the spring is fully compressed. In this state, there is no gap between the physical structures of the spring and it cannot be compressed further. The physical length of the spring L2 = d1*n1+d2+d3, where d1 is the spring wire diameter, n1 is the maximum number of turns of the spring in the axial direction, d2 is the thickness of the outermost spring at one end of the spring, and d3 is the thickness of the outermost spring on the other side of the spring. Figure 3b and 3c As shown in the figure, the spring is a spiral cylindrical coil, and the spring wire diameter d1 is the diameter of each coil of the spring body. As the number of spiral coils increases, the length of the spring body is the sum of the length of each coil of the spring body, that is, d1*n1. Figure 3b As shown, the number of turns of the spring is 4, and the length of the entity of this part after being fully compressed is d1*4. The end of the spring can be ground flat for easy assembly. The so-called grinding process refers to grinding a part of the originally cylindrical spring entity to make its top surface smoother. After the grinding process, the spring entity becomes thinner, that is, it is no longer a complete cylinder. Then the thickness d2 and d3 of the spring entity in this area will be less than the spring wire diameter d1; of course, in some embodiments, the end of the spring may not be processed. In this case, the thickness of the spring entity is equal to the spring wire diameter d1, that is, d2≤d1, d3≤d1. Therefore, the overall length of the spring entity is L2=d1*n1+d2+d3. By setting L1>L2, the spring will not be completely compacted after assembly, and there is still room for compression activity.

[0141] According to some embodiments of the present application, the compression margin of the elastic member 322 in a compressed state between the valve cover 312 and the blocking member 321 is greater than or equal to 0.5 mm, that is, L1-L2>0.5 mm. The elastic member 322 has enough compression margin for the blocking member 321 to move along the axial direction Y of the valve cavity 313, so that the blocking member 321 can open the air inlet 313a. If the elastic member 322 is a spring, then on the axial direction Y of the valve cavity 313, the sum of the gaps between the coils of the spring is greater than or equal to 0.5 mm. Exemplarily, L1-L2 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc.

[0142] Please continue reading Figure 3b According to some embodiments of the present application, the diameter of the first guide column 31211 is D1, and the inner diameter of the elastic member 322 is D2, satisfying 0mm<D2-D1≤5mm.

[0143] The elastic member 322 is a spring, and the inner diameter D2 of the elastic member 322 is the diameter of the cavity formed inside the spring. 0mm<D2-D1≤5mm, that is, when the first guide column 31211 and the elastic member 322 are coaxially arranged, the size of the gap between the first guide column 31211 and the elastic member 322 is greater than 0mm and less than or equal to 5mm.

[0144] Exemplarily, the difference between the inner diameter of the elastic member 322 and the diameter of the first guide column 31211 can be 0mm, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc.

[0145] By setting the difference between the inner diameter of the elastic member 322 and the diameter of the first guide column 31211 to be greater than 0 mm and less than or equal to 5 mm, on the one hand, the phenomenon that the elastic member 322 is not convenient to be assembled on the first guide column 31211 due to the difference between the inner diameter of the elastic member 322 and the diameter of the first guide column 31211 being less than or equal to 0 can be alleviated, so as to reduce the scratching phenomenon when the elastic member 322 is sleeved on the first guide column 31211; on the other hand, the phenomenon that the gap between the elastic member 322 and the first guide column 31211 is too large due to the difference between the inner diameter of the elastic member 322 and the diameter of the first guide column 31211 is too large can be alleviated, so as to reduce the radial movement or radial deformation of the elastic member 322, thereby improving the balance of the elastic force of the elastic member 322 acting on the blocking member 321, so as to reduce the risk of the blocking member 321 accidentally opening the air inlet 313a.

[0146] Please continue reading Figure 3b According to some embodiments of the present application, the diameter of the second guide column 3212b is D3, and the inner diameter of the elastic member 322 is D2, satisfying 0mm<D3-D1≤5mm.

[0147] The elastic member 322 is a spring, and the inner diameter D2 of the elastic member 322 is the diameter of the cavity formed inside the spring.

[0148] 0mm<D3-D1≤5mm, that is, when the second guide post 3212b and the elastic member 322 are coaxially arranged, the size of the gap between the second guide post 3212b and the elastic member 322 is greater than 0mm and less than or equal to 5mm.

[0149] Exemplarily, the difference between the inner diameter of the elastic member 322 and the diameter of the second guide column 3212b can be 0mm, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc.

[0150] By setting the difference between the inner diameter of the elastic member 322 and the diameter of the second guide column 3212b to be greater than 0 mm and less than or equal to 5 mm, on the one hand, the phenomenon that the elastic member 322 is not convenient to be assembled on the second guide column 3212b due to the difference between the inner diameter of the elastic member 322 and the diameter of the second guide column 3212b being less than or equal to 0 can be alleviated, so as to reduce the scratching phenomenon when the elastic member 322 is sleeved on the second guide column 3212b. On the other hand, the phenomenon that the gap between the elastic member 322 and the second guide column 3212b is too large due to the difference between the inner diameter of the elastic member 322 and the diameter of the second guide column 3212b is too large can be alleviated, so as to reduce the radial movement or radial deformation of the elastic member 322, thereby improving the balance of the elastic force of the elastic member 322 acting on the blocking member 321, so as to reduce the risk of the blocking member 321 accidentally opening the air inlet 313a.

[0151] In this embodiment, the valve core 32 is arranged in the valve cavity 313 so that the valve core 32 can block the air inlet passage, and when the pressure inside the shell rises, the gas inside the shell can act on the valve core 32 and drive the valve core 32 to open the air inlet passage, so as to realize the one-way exhaust function of the one-way valve 30, so that the one-way valve 30 can discharge the gas inside the shell to the outside of the shell.

[0152] According to some embodiments of the present application, the opening pressure of the valve core 32 is greater than or equal to 0.2MPa; optionally, greater than or equal to 0.4MPa; and optionally, greater than or equal to 0.8MPa. Exemplarily, the opening pressure of the valve core 32 can be 0.20MPa, 0.25MPa, 0.30MPa, 0.35MPa, 0.40MPa, 0.45MPa, 0.50MPa, 0.55MPa, 0.60MPa, 0.65MPa, 0.70MPa, 0.75MPa, 0.80MPa, 0.90MPa, 1.00MPa.

[0153] The one-way valve opening pressure test method and principle can be tested based on the helium leakage standard, which is defined as follows: if the leakage rate is less than 10^-6Pa.m^3 / s, the system is considered to be sealed; if the leakage rate is greater than 10^-6Pa.m^3 / s, it indicates that there is gas leakage in the system.

[0154] During the test, the test chamber is sealed with a one-way valve, and helium is filled into the test chamber. The amount of helium in the environment of the test chamber is monitored with a helium detector. If helium is detected and the leakage rate is greater than 10^-6Pa.m^3 / s, it means that the test chamber is no longer sealed and helium is leaking out. The helium leakage rate is continuously monitored. When the leakage rate is greater than 10^-5Pa.m^3 / s, the one-way valve is determined to be open for deflation, and the pressure of the test chamber at this time is recorded as the opening pressure of the one-way valve.

[0155] According to some embodiments of the present application, the battery cell 20 includes an end cap 21, and the end cap 21 includes an outer surface 21a and an inner surface 21b disposed opposite to each other, the outer surface 21a is disposed toward the outside of the housing, and the inner surface 21b is disposed toward the inside of the housing. The one-way valve 30 is disposed on the end cap 21, and the valve body 31 of the one-way valve 30 may be disposed toward the outside of the housing and at least partially protrude from the outer surface 21a of the end cap 21; or the valve body 31 of the one-way valve 30 may be disposed toward the inside of the housing and at least partially protrude from the inner surface 21b of the end cap 21.

[0156] Please refer to Figure 4 , Figure 5 and Figure 6 , Figure 5 is a front view of a one-way valve 30 according to one or more embodiments, Figure 6 Schematic diagram of a partial cross-sectional structure of a battery cell 20 according to one or more embodiments. According to some embodiments of the present application, the end cap 21 includes an outer surface 21a and an inner surface 21b disposed opposite to each other, the outer surface 21a is disposed toward the outside of the housing, and the inner surface 21b is disposed toward the inside of the housing; the one-way valve 30 is disposed on the end cap 21, and the valve body 31 of the one-way valve 30 is disposed on the outer surface 21a, and at least part of the valve body 31 protrudes from the outer surface 21a of the end cap 21.

[0157] In this embodiment, the one-way valve 30 includes a valve body 31 and a valve core 32. The valve body 31 has a valve cavity 313 inside, and the valve core 32 is disposed in the valve cavity 313. The valve body 31 includes a valve seat 311 and a valve cover 312. The valve cover 312 includes a cover top wall 3121 and a cover side wall 3122 connected to the cover top wall 3121. The cover top wall 3121, the cover side wall 3122 and the valve seat 311 enclose a valve cavity 313. The valve seat 311 is provided with an air inlet 313a of the valve cavity 313 to connect the valve cavity 313 with the inside of the shell; the valve cover 312 is provided with an air outlet 313b of the valve cavity 313 to connect the valve cavity 313 with the outside of the shell. The valve core 32 is used to block the air inlet channel of the valve cavity 313. The valve core 32 is configured to open the air inlet channel under the action of the gas inside the shell and release the gas inside the battery cell 20. In this embodiment, the valve core 32 directly blocks the air inlet 313a of the valve cavity 313, and the air inlet passage includes a gas flow path from the inside of the shell of the battery cell 20 to the air inlet 313a of the valve cavity 313 to the side of the air inlet 313a where gas is discharged.

[0158] In this embodiment, the valve body 31 of the one-way valve 30 is provided with a valve seat 311 and a valve cover 312. The one-way valve 30 with this structure is provided with the valve body 31 as two parts, so that it is convenient to assemble the valve core 32 into the valve cavity 313, which is helpful to reduce the difficulty of assembling the one-way valve 30.

[0159] Please continue to refer to Figure 4 and Figure 6 According to some embodiments of the present application, the valve seat 311 has a first through hole 3111 penetrating the valve seat 311, and the air inlet 313a is the first through hole 3111, that is, the first through hole 3111 is used as the air inlet 313a of the valve cavity 313. The cover side wall 3122 has a second through hole 31221 penetrating the cover side wall 3122, and the air outlet 313b is the second through hole 31221, that is, the second through hole 31221 is used as the air outlet 313b of the valve cavity 313. This arrangement can facilitate the outward transmission of gas inside the battery 100.

[0160] According to some embodiments of the present application, the second through hole 31221 extends to the end of the cover side wall 3122 in a direction away from the cover top wall 3121. Figure 4 As shown, the direction away from the cover top wall 3121 is the direction from the cover top wall 3121 to the valve seat 311 (the X direction in the figure), and the second through hole 31221 is formed by removing part of the structure of the cover side wall 3122. Along the X direction, the cover side wall 3122 is directly hollowed out to the bottom end of the cover side wall 3122. In a further embodiment, along the X direction, the lower opening surface of the second through hole 31221 can be flush with the sealing surface of the blocking member 321, that is, the sealing interface is higher than or flush with the bottom wall of the second through hole 31221. Through this arrangement, when the one-way valve 30 is opened to exhaust, that is, when the blocking member 321 opens the sealing interface, the electrolyte liquid brought out with the gas can be discharged outward in time, so that the electrolyte is not easy to accumulate on the outer edge of the blocking member 321, thereby effectively ensuring the sealing and repeated opening function of the one-way valve 30.

[0161] According to some embodiments of the present application, there are multiple second through holes 31221, and the multiple second through holes 31221 are spaced apart in the circumferential direction of the cover side wall 3122. Through this arrangement, when the one-way valve 30 is opened for exhaust, the gas can be exhausted more quickly, and the exhaust time can be shortened, that is, the time when the battery 100 shell is in an open state is shortened, so as to reduce the invasion of external water vapor into the battery 100 system during the valve opening period.

[0162] Please refer to Figure 7 , Figure 7 Schematic diagram of the cross-sectional structure of the one-way valve 30 according to one or more embodiments. According to some embodiments of the present application, a first guide column 31211 is convexly provided on the side of the top wall 3121 of the cover facing the blocking member 321, and a part of the elastic member 322 is sleeved on the outside of the first guide column 31211; the top wall 3121 of the cover has a third through hole 31212 that penetrates the top wall 3121 of the cover and the first guide column 31211, and the air outlet 313b is the third through hole 31212. That is, the third through hole 31212 is used as the air outlet 313b of the valve cavity 313. This arrangement can facilitate the outward transmission of gas inside the battery 100.

[0163] Please continue to refer to Figure 4 , Figure 5 , Figure 6 and Figure 7 According to some embodiments of the present application, the valve cover 312 also includes a flange wall 31222, the cover side wall 3122 connects the cover top wall 3121 and the flange wall 31222, the flange wall 31222 extends toward a side away from the valve cavity 313 relative to the cover side wall 3122, and the flange wall 31222 is connected to the valve seat 311.

[0164] According to some embodiments of the present application, the valve cover 312 is connected to the valve seat 311. Specifically, a first recessed groove 3112 is provided on the side of the valve seat 311 facing the valve cover 312, and at least a portion of the flange wall 31222 is accommodated in the first recessed groove 3112 and connected to the valve seat 311.

[0165] In this embodiment, a first recess 3112 is provided on the side of the valve seat 311 facing the valve cover 312, and at least a portion of the flange wall 31222 is accommodated in the first recess 3112. The one-way valve 30 adopting such a structure can save the space occupied by the valve body 31 in the thickness direction of the end cover 21 on the one hand, and can improve the structural stability of the valve cover 312 assembled on the valve seat 311 on the other hand.

[0166] According to some embodiments of the present application, the flange wall 31222 is accommodated in the first sink 3112 and connected to the valve seat 311. The thickness of the flange wall 31222 is less than or equal to the depth of the first sink 3112, so that after the flange wall 31222 is connected to the valve seat 311, the surface of the flange wall 31222 facing the cover top wall 3121 is flush with the surface of the valve seat 311 facing the valve cover 312; or the surface of the flange wall 31222 facing the cover top wall 3121 is lower than the surface of the valve seat 311 facing the valve cover 312. Figure 6 and Figure 7 As shown, after the valve cover 312 is connected to the valve seat 311, the flange wall 31222 is flush with the surface of the valve seat 311. This arrangement can reduce the overall installation height of the one-way valve 30.

[0167] According to some embodiments of the present application, the material of the valve seat 311 may be a metal material, such as copper, iron, aluminum, steel or aluminum alloy. Similarly, the material of the valve cover 312 may also be a metal material, such as copper, iron, aluminum, steel or aluminum alloy. The valve seat 311 and the valve cover 312 may be made of the same material or different materials. The valve cover 312 and the valve seat 311 may be assembled by welding (such as laser welding); they may also be assembled by mechanical interference, but the static friction generated by the interference must be greater than the rebound force of the elastic member 322.

[0168] According to some embodiments of the present application, the flange wall 31222 is welded to the valve seat 311. Specifically, the flange wall 31222 is an annular component with a certain thickness, and the outer peripheral surface of the flange wall 31222 is used as a connecting surface 31222a to be welded to the groove wall surface of the first sink groove 3112. Further, the connecting surface 31222a of the flange wall 31222 can be set as an inclined surface, and the groove wall surface of the first sink groove 3112 can also be set as an inclined surface, so that the connecting surface 31222a of the flange wall 31222 fits with the groove wall surface of the first sink groove 3112, such as Figure 6 and Figure 7 As shown, the flange wall 31222 and the first sink 3112 may form an interlocking structure. In this way, the welding quality can be improved, and the strength and stability of the connection can be enhanced. Furthermore, the valve cover 312 and the valve seat 311 are preferably made of the same material to achieve better welding quality.

[0169] According to some embodiments of the present application, in the circumferential direction of the cover side wall 3122, at least a portion of the first weld mark W1 where the flange wall 31222 is welded to the valve seat 311 is staggered with the second through hole 31221. Figure 5 As shown, welding can be performed at a position on the cover side wall 3122 where no second through hole 31221 is opened. There can be multiple first weld marks W1, and the multiple first weld marks W1 are distributed in the circumferential direction of the cover side wall 3122, and the distribution of the first weld marks W1 can be staggered with the distribution of the second through holes 31221. In other words, multiple second through holes 31221 are spaced apart in the circumferential direction of the cover side wall 3122, and there is a solid wall at a position without openings between adjacent second through holes 31221, and welding is performed at a place with a solid wall. In this way, the solid wall has a certain heat-blocking effect, which can protect the sealing part 321 of the valve core 32, reduce the influence of high temperature during welding on the sealing part 321, and prevent the sealing part 321 from being deformed by heat, thereby causing failure of the sealing interface when the valve is not opened.

[0170] Please refer to Figure 8 , Fig. 9 , Fig.10 and Fig.11 , Figure 8 is a front view of a one-way valve 30 according to one or more embodiments, Fig. 9 is a bottom view of a one-way valve 30 according to one or more embodiments, Fig.10 is a schematic diagram of an exploded structure of a one-way valve 30 according to one or more embodiments. Fig.11Schematic diagram of a partial cross-sectional structure of a battery cell 20 according to one or more embodiments. According to some embodiments of the present application, the valve seat 311 is connected to the valve cover 312. Specifically, the valve cover 312 includes a flange wall 31222, and the valve seat 311 is connected to the flange wall 31222. In other words, the valve seat 311 is connected to the flange wall 31222 of the valve cover 312.

[0171] According to some embodiments of the present application, a connecting protrusion 3113 is convexly provided on the outer circumference of the valve seat 311 , and a receiving groove 31222b is provided on the inner circumference of the flange wall 31222 . The connecting protrusion 3113 is received in the receiving groove 31222b and connected to the flange wall 31222 .

[0172] There are multiple connecting protrusions 3113, and the multiple connecting protrusions 3113 are arranged at intervals along the circumference of the valve seat 311. There are multiple corresponding receiving grooves 31222b, and the number of connecting protrusions 3113 is the same as the number of receiving grooves 31222b; the shape of the connecting protrusion 3113 matches the shape of the receiving groove 31222b, so that the connecting protrusion 3113 can be accommodated in the receiving groove 31222b. With this arrangement, after the valve cover 312 is connected to the valve seat 311, the surface of the flange wall 31222 is flush with the surface of the valve seat 311. In this way, the valve seat 311 will be embedded in the valve cover 312, which can reduce the overall installation height of the one-way valve 30. Compare Figure 6 and Fig.11 , Figure 6 In the scheme, the valve cover 312 is connected to the valve seat 311, and its installation height is the thickness of the valve cover 312 superimposed on the thickness of the valve seat 311; Fig.11 In the scheme, the valve seat 311 is connected to the valve cover 312, the valve seat 311 is completely contained, and its installation height is the thickness of the valve cover 312; compared with the former, the installation height of this embodiment is lower, reducing the space occupancy rate.

[0173] According to some embodiments of the present application, the connecting protrusion 3113 is welded to the flange wall 31222. The flange wall 31222 has an upper surface 31222c and a lower surface 31222d that are arranged opposite to each other, and the upper surface 31222c is arranged toward the cover top wall 3121. The second weld mark W2 of the flange wall 31222 of the connecting protrusion 3113 and the cover side wall 3122 is located on the lower surface 31222d of the flange wall 31222. That is, the welding is performed from the lower side of the valve cover 312 and the valve seat 311, as shown in FIG. Fig.11 The second weld mark W2 shown in the figure is located on the side away from the valve cavity 313. In this way, the valve seat 311 and the flange wall 31222 have a certain heat blocking effect, which can protect the sealing member 321 of the valve core 32 and reduce the influence of the high temperature during welding on the sealing member 321, so as to prevent the sealing member 321 from being deformed by heat, thereby causing the sealing interface to fail when the valve is not opened.

[0174] Please refer to Fig.12 , Fig.12 2 is a schematic diagram of a partial cross-sectional structure of a battery cell 20 according to one or more embodiments. According to some embodiments of the present application, a one-way valve 30 is disposed on an outer surface 21a of the end cover 21, and a valve body 31 of the one-way valve 30 faces the outside of the housing and at least a portion of the valve body 31 protrudes from the outer surface 21a of the end cover 21.

[0175] In this embodiment, the one-way valve 30 includes a valve body 31 and a valve core 32. The valve body 31 has a valve cavity 313 inside, and the valve core 32 is arranged in the valve cavity 313. The valve body 31 includes a valve cover 312, and the valve cover 312 includes a cover top wall 3121 and a cover side wall 3122 connected to the cover top wall 3121. The cover top wall 3121, the cover side wall 3122 and the end cover 21 enclose the valve cavity 313. The end cover 21 is provided with an air inlet 313a of the valve cavity 313 to connect the valve cavity 313 with the inside of the shell; the valve cover 312 is provided with an air outlet 313b of the valve cavity 313 to connect the valve cavity 313 with the outside of the shell. The valve core 32 is used to block the air inlet channel of the valve cavity 313. The valve core 32 is configured to open the air inlet channel under the action of the gas inside the shell and release the gas inside the battery cell 20. In this embodiment, the valve core 32 directly blocks the air inlet 313a of the valve cavity 313, and the air inlet passage includes a gas flow path from the inside of the shell of the battery cell 20 to the air inlet 313a of the valve cavity 313 to the side of the air inlet 313a where gas is discharged.

[0176] In this embodiment, the valve body 31 of the one-way valve 30 may only have a valve cover 312 without a valve seat 311, and the valve cover 312 may be directly connected to the end cover 21; or in other words, the end cover 21 may be used as the valve seat 311 of the valve body 31. In this way, the installation height of the one-way valve 30 can be reduced. Figure 6 , Fig.11 and Fig.12 , Figure 6 In the scheme, the valve cover 312 is connected to the valve seat 311, and its installation height is the thickness of the valve cover 312 superimposed on the thickness of the valve seat 311, and then superimposed on the thickness of the end cover 21; Fig.11 In the scheme, the valve seat 311 is connected to the valve cover 312, the valve seat 311 is completely contained, and its installation height is the thickness of the valve cover 312 plus the thickness of part of the end cover 21; Fig.12 In the scheme, the valve cover 312 can be embedded in the end cover 21, and its installation height can be the thickness of the end cover 21. Compared with the three, the installation height of this embodiment is lower, which reduces the space occupancy.

[0177] According to some embodiments of the present application, a first exhaust hole 291 is provided on the end cover 21, and the first exhaust hole 291 connects the inside of the shell with the outside of the shell, and the air inlet 313a is the first exhaust hole 291, that is, the first exhaust hole 291 is used as the air inlet 313a of the valve cavity 313. The cover side wall 3122 has a second through hole 31221 that penetrates the cover side wall 3122, and the air outlet 313b is the second through hole 31221, that is, the second through hole 31221 is used as the air outlet 313b of the valve cavity 313. This arrangement can facilitate the outward transmission of gas inside the battery 100. In other embodiments, the air outlet 313b may also be a third through hole 31212 located on the cover top wall 3121 and penetrating the cover top wall 3121 and the first guide column 31211, see for details. Figure 7 As described above, I will not repeat it here.

[0178] According to some embodiments of the present application, a second groove (not shown in the figure) recessed relative to the outer surface 21a of the end cover 21 is provided on the side of the end cover 21 facing the outside of the shell, and at least a portion of the flange wall 31222 of the valve cover 312 is accommodated in the second groove and connected to the end cover 21.

[0179] In this embodiment, a second groove is provided on the side of the end cover 21 facing the outside of the shell, and at least a portion of the flange wall 31222 is accommodated in the second groove. The one-way valve 30 with this structure can save the space occupied by the valve body 31 in the thickness direction of the end cover 21.

[0180] According to some embodiments of the present application, the flanged wall 31222 is accommodated in the second sink and connected to the end cover 21. The thickness of the flanged wall 31222 is less than or equal to the depth of the second sink, so that after the flanged wall 31222 is connected to the end cover 21, the surface of the flanged wall 31222 facing the cover top wall 3121 is flush with the surface of the end cover 21 facing the outside of the shell; or the surface of the flanged wall 31222 facing the cover top wall 3121 is lower than the surface of the end cover 21 facing the outside of the shell. Fig.12 As shown, after the valve cover 312 is connected to the end cover 21, the flange wall 31222 is flush with the surface of the end cover 21. This arrangement can reduce the overall installation height of the one-way valve 30.

[0181] According to some embodiments of the present application, the flange wall 31222 is welded to the end cover 21. Specifically, the flange wall 31222 is an annular component with a certain thickness, and the outer peripheral surface of the flange wall 31222 is used as a connecting surface 31222a to be welded to the groove wall surface of the second sink groove. Further, the connecting surface 31222a of the flange wall 31222 can be set as an inclined surface, and the groove wall surface of the second sink groove is also set as an inclined surface, so that the connecting surface 31222a of the flange wall 31222 fits with the groove wall surface of the second sink groove, such as Fig.12As shown, the flange wall 31222 and the second sink groove may form an interlocking structure. In this way, the welding quality can be improved, and the strength and stability of the connection can be enhanced. Furthermore, it is preferred that the valve cover 312 and the end cover 21 are made of the same material to achieve better welding quality. For example, both are made of aluminum.

[0182] Please refer to Figure 6 and Fig.13 , Fig.14 , Fig.15 , Fig.13 is a schematic diagram of a partial cross-sectional structure of an end cover 21 according to one or more embodiments; Fig.14 FIG. 2 is a front view of an end cover 21 of a battery cell 20 according to one or more embodiments. Fig.15 2 is a partial exploded structural diagram of a battery cell 20 according to one or more embodiments. According to some embodiments of the present application, a one-way valve 30 is disposed on the end cover 21, and a valve body 31 of the one-way valve 30 faces the outside of the housing and at least a portion of the valve body 31 protrudes from an outer surface 21a of the end cover 21.

[0183] The end cover 21 is provided with a first exhaust hole 291, which includes a through hole section 280 and a first hole section 281. The through hole section 280 and the first hole section 281 are arranged along the thickness direction of the end cover 21. The through hole section 280 connects the inside of the shell with the outside of the shell. The first hole section 281 is located on the side of the through hole section 280 away from the inside of the shell. The aperture of the first hole section 281 is larger than the aperture of the through hole section 280. The one-way valve 30 is at least partially accommodated in the first hole section 281. The valve body 31 of the one-way valve 30 faces the outside of the shell and at least part of the valve body 31 protrudes from the outer surface 21a of the end cover 21. Fig.13 As shown, the first exhaust hole 291 is a countersunk hole recessed relative to the outer surface 21a of the end cover 21. When the one-way valve 30 is connected to the end cover 21, part of the structure of the one-way valve 30 can be embedded in the first exhaust hole 291 to reduce the installation height.

[0184] See also Figure 6 According to some embodiments of the present application, a first step surface 311b and a second step surface 311c are provided on the side of the valve seat 311 facing the valve cover 312, the first step surface 311b is closer to the valve cover 312 than the second step surface 311c, and the first sink groove 3112 is provided on the first step surface.

[0185] The first hole section 281 includes a hole side surface arranged circumferentially, and the outer peripheral surface of the valve cover 312 / valve seat 311 of the one-way valve 30 is welded to the hole side surface. The outer peripheral surface of the second step is welded to the hole side surface.

[0186] According to some embodiments of the present application, the hole side surface matches the outer peripheral surface of the valve cover 312 / valve seat 311 of the one-way valve 30, and the hole side surface and the outer peripheral surface of the valve cover 312 / valve seat 311 of the one-way valve 30 are arranged at an acute angle to the central axis of the first exhaust hole 291. Through this arrangement, the connection strength can be enhanced.

[0187] According to some embodiments of the present application, the one-way valve 30 is welded to the end cover 21. Figure 6 As shown, the valve seat 311 of the one-way valve 30 can be welded to the end cover 21; specifically, the valve cover 312 of the one-way valve 30 is connected to the valve seat 311, and the valve seat 311 is welded to the end cover 21. In other embodiments, when the one-way valve 30 is selected Fig.11 In the illustrated embodiment, the valve seat 311 of the one-way valve 30 may be connected to the valve cover 312 , and the valve cover 312 may be welded to the end cover 21 .

[0188] According to some embodiments of the present application, a stress relief groove is provided around the weld mark of the valve cover 312 / valve seat 311 and the end cover 21. The stress relief groove may be provided only on the end cover 21, or only on the valve cover 312 / valve seat 311, or on both the end cover 21 and the valve cover 312 / valve seat 311. Optionally, a first stress relief groove is provided on the surface of the valve seat 311 / valve cover 312 facing the outside of the shell; and / or a second stress relief groove is provided on the surface of the wall facing the outside of the shell.

[0189] Please refer to Fig.16 and Fig.17 , Fig.18 , Fig.19 , Fig.16 is a front view of a one-way valve 30 according to one or more embodiments, Fig.17 is a schematic diagram of an exploded structure of a one-way valve 30 according to one or more embodiments. Fig.18 is a schematic cross-sectional structure diagram of a one-way valve 30 according to one or more embodiments; Fig.19 Schematic diagram of the state of the one-way valve 30 according to one or more embodiments.

[0190] In this embodiment, a weak area 3119 is provided on the valve body 31 of the one-way valve 30. By providing the weak area 3119, when the internal pressure of the battery cell 20 is too high, the valve body 31 can be broken at the weak area 3119 to release the pressure of the battery cell 20 in time.

[0191] like Fig.19As shown, before the valve is opened, the valve body 31 of the one-way valve 30 is intact, and the valve core 32 blocks the air inlet 313a under pressure, presenting a sealed state. After the valve is opened, the valve body 31 of the one-way valve 30 is partially opened, and the sealing interface fails to release the pressure inside the battery cell 20.

[0192] In one embodiment, the weak strength area 3119 includes a thickness weak area, that is, the thickness of this area may be relatively thinner than other areas of the valve body 31, and the strength is reduced by reducing the thickness. In other embodiments, the weak strength area 3119 may be constructed by selecting materials with different strengths, such as selecting some materials with relatively low strength to form the weak strength area 3119.

[0193] In one embodiment, the valve body 31 includes a valve cover 312, and the valve cover 312 includes a cover top wall 3121 and a cover side wall 3122 connected to the cover top wall 3121. The thickness weakened area 3119 includes a groove provided on the cover side wall 3122. By providing the groove on the cover side wall 3122, the thickness of the cover side wall 3122 in the area where the groove is located can be reduced, thereby achieving thickness weakening.

[0194] In one embodiment, the groove is located on the side of the cover side wall 3122 facing the valve cavity 313; or the groove is located on the side of the cover side wall 3122 away from the valve cavity 313. In other words, the grooves can be provided on both sides of the cover side wall 3122. The orthographic projections of the grooves on the cover side wall 3122 at both sides at least partially overlap. Through this arrangement, the thickness of the cover side wall 3122 can be reduced from both sides, and the thickness of the cover side wall 3122 where the grooves are provided can be reduced, so that the thickness is thin and it is easier to break when under pressure.

[0195] In one embodiment, the cover side wall 3122 has a second through hole 31221 penetrating the cover side wall 3122, and the groove is provided on the connecting arm between two adjacent second through holes 31221. There may be a plurality of second through holes 31221, and the plurality of second through holes 31221 are provided at intervals in the circumferential direction of the cover side wall 3122. The provision of the second through holes 31221 can cause a part of the cover side wall 3122 to be physically missing, which reduces the strength of the cover side wall 3122 to a certain extent. On this basis, a thickness weak area is provided, which makes it easier to break when under pressure.

[0196] A groove may be provided on the connecting arm between two adjacent second through holes 31221. The groove may extend along the circumference of the valve cover 312 and may extend to both ends of the connecting arm. Fig.16 As shown, the thickness weakened area is a groove extending circumferentially along the cover side wall 3122 .

[0197] In one embodiment, the thickness weakened area includes a first score groove, which is a circumferential groove surrounding the cover side wall 3122.

[0198] like Fig.16 As shown, due to the provision of the second through hole 31221, in the axis Y direction of the valve cavity 313, the cover side wall 3122 includes a solid area 3122a and an exhaust area 3122b. In the circumferential direction of the valve cavity 313, the second through hole 31221 is provided on the cover side wall 3122 of the exhaust area 3122b, and the cover side wall 3122 is discontinuous, while the cover side wall 3122 of the solid area 3122a is a continuous solid structure, so a thickness weakened area can also be provided on the cover side wall 3122 of the solid area 3122a. Specifically, the thickness weakened area includes a first notch groove, which is a circumferential groove on the cover side wall 3122.

[0199] In other embodiments, the grooves may also be discontinuous in the circumferential direction of the cover side wall 3122. Specifically, the thickness weakened area includes a plurality of second notched grooves, and the plurality of second notched grooves are arranged at intervals in the circumferential direction of the cover side wall 3122. That is, a plurality of discontinuous grooves may be provided on the cover side wall 3122 of the solid area 3122a.

[0200] Please refer to Figure 5 , Figure 8 and Fig.16 The one-way valve 30 in the present application may not include the weak strength area 3119 or may include the weak strength area 3119. The one-way valve 30 may be selected as needed. In some embodiments, two types of one-way valves 30 may be provided on one battery cell 20 at the same time.

[0201] Please refer to Fig. 20 and Fig.21 , Fig. 20 FIG. 2 is a front view of an end cover 21 of a battery cell 20 according to one or more embodiments. Fig.213 is a schematic diagram of a partial decomposition structure of a battery cell 20 according to one or more embodiments. The one-way valve 30 with a weak strength area 3119 has a pressure relief effect to a certain extent. Therefore, when this kind of one-way valve 30 is selected, the pressure relief mechanism 70 may not be provided on the battery cell 20. Of course, when the one-way valve 30 with a weak strength area 3119 is selected, the pressure relief mechanism 70 may also be provided on the battery cell 20 at the same time. When the weak strength area 3119 is provided on the valve body 31, the actuation pressure of the pressure relief mechanism 70 is greater than the actuation pressure of the weak strength area 3119, and the actuation pressure of the weak strength area 3119 is greater than the opening pressure of the one-way valve 30. Through this arrangement, when the battery cell 20 has thermal runaway, the gas inside the shell of the battery cell 20 will increase rapidly to open the pressure relief mechanism 70 for pressure relief. When the gas generated inside the shell 21 of the battery cell 20 reaches a threshold during normal use, the one-way valve 30 can be opened, but the pressure relief mechanism 70 cannot be opened. Furthermore, when thermal runaway occurs, before opening the pressure relief mechanism 70 , the one-way valve 30 may be destroyed at the weak strength area 3119 to release pressure to a certain extent. If the internal air pressure of the battery cell 20 still increases, the pressure relief mechanism 70 may be opened.

[0202] Please refer to Fig. 22 , Fig. 22 Schematic diagram of the exploded structure of the battery cell 20 according to one or more embodiments. According to some embodiments of the present application, the battery cell 20 further includes a protective patch 60, which is disposed on the side of the end cap 21 facing the outside of the housing. That is, the protective patch 60 is disposed on the outer surface 21a of the end cap 21 to provide a certain degree of protection for the end cap 21. The material of the protective patch 60 can be various, such as rubber, silicone or plastic.

[0203] According to some embodiments of the present application, the protective patch 60 is provided with a first avoidance hole 601 penetrating the protective patch 60 , and the first avoidance hole 601 is used for the one-way valve 30 to pass through.

[0204] According to some embodiments of the present application, in an embodiment where an electrode terminal 25 is provided on the end cap 21, see Fig. 22 As shown, the protective patch 60 is provided with a second avoidance hole 602 at the position corresponding to the electrode terminal 25, and the second avoidance hole 602 runs through both sides of the protective patch 60. The second avoidance hole 602 is used to allow the electrode terminal 25 to pass through to avoid the electrode terminal 25. Exemplarily, two electrode terminals 25 are provided on the end cover 21, and correspondingly, the protective patch 60 is provided with two second avoidance holes 602, each of which is used for one electrode terminal 25 to pass through.

[0205] In the embodiment where the pressure relief mechanism 70 is provided on the end cover 21, see Fig. 22As shown, a third avoidance hole 603 is provided at the position of the protective patch 60 corresponding to the pressure relief mechanism 70. The third avoidance hole 603 runs through both sides of the protective patch 60. The orthographic projection of the pressure relief mechanism 70 on the protective patch 60 is located in the third avoidance hole 603, so that the third avoidance hole 603 can avoid the pressure relief mechanism 70.

[0206] According to some embodiments of the present application, the protective patch 60 is provided with an information collection hole (not shown) that passes through the protective patch 60, and the information collection hole serves as a part of the exposed end cover 21, so as to facilitate setting an information code on the end cover 21 or connecting a detection element for sampling, etc.

[0207] According to some embodiments of the present application, the protective patch 60 may be disposed on the end cover 21 in various structures, and the protective patch 60 may be disposed on the end cover 21 by bonding, adsorption, or the like.

[0208] Please continue to refer to Fig. 22 According to some embodiments of the present application, the battery cell 20 further includes an insulating member 24, which is disposed on the side of the end cap 21 facing the inside of the housing; that is, an insulating member 24 may also be disposed on the inner side of the end cap 21, and the insulating member 24 may be used to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. Exemplarily, the insulating member 24 may be plastic, rubber, etc.

[0209] The insulating member 24 is made of a material that will not contact the electrode assembly 23 inside the battery 100 to form a short circuit. The insulating member 24 is used to protect the end cap 21 from being directly exposed to the electrode assembly 23 in the height direction to avoid contacting the electrode assembly 23 to form a short circuit.

[0210] The insulating member 24 is provided with a second exhaust hole 292 penetrating the insulating member 24, so that the gas inside the battery 100 enters the area of ​​the one-way valve 30 through the first exhaust hole 291. Furthermore, the second exhaust hole 292 is connected to the first exhaust hole 291 to make exhaust smoother.

[0211] According to some embodiments of the present application, see Fig. 22 The battery cell 20 further includes a pressure relief mechanism 70 , which is disposed on the housing and configured to be actuated and release the internal pressure of the battery cell 20 when the battery cell 20 thermally runs away.

[0212] The pressure relief mechanism 70 is disposed on the housing, and may be disposed on the end cover 21 or on the housing 22. Figure 1 In the embodiment, the pressure relief mechanism 70 is disposed on the end cover 21 .

[0213] The pressure relief mechanism 70 is configured to actuate and release the internal pressure of the battery cell 20 when the battery cell 20 is in thermal runaway, that is, when thermal runaway occurs inside the battery cell 20, the pressure relief mechanism 70 can be actuated and opened to release the gas generated inside the battery cell 20 due to thermal runaway. It should be noted that when thermal runaway occurs in the battery cell 20, the gas inside the shell of the battery cell 20 will increase rapidly to open the pressure relief mechanism 70 for pressure relief, while the gas generated inside the shell of the battery cell 20 during normal use can be discharged through the one-way valve 30, but the pressure relief mechanism 70 cannot be opened.

[0214] Optionally, the pressure relief mechanism 70 and the housing can be an integral structure or a separate structure. If the pressure relief mechanism 70 and the housing are an integral structure, the pressure relief mechanism 70 is an area on the housing where a weak structure is provided, such as an area on the housing where a notch is provided; if the pressure relief mechanism 70 and the housing are a separate structure, the pressure relief mechanism 70 can be connected to the housing by welding, hot melting, injection molding, or bonding. For example, in Fig.15 In the embodiment, the pressure relief mechanism 70 and the housing are separately arranged, and the pressure relief mechanism 70 is arranged on the end cover 21 of the housing. The pressure relief mechanism 70 can be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, a pressure relief valve or a safety valve.

[0215] For example, in Figure 1 In the embodiment, the electrode terminal 25 and the pressure relief mechanism 70 are both arranged on the end cover 21. The battery cell 20 adopting this structure can save the space occupied by the battery cell 20. Of course, in other embodiments, the electrode terminal 25 and the pressure relief mechanism 70 can also be arranged on different walls of the outer shell. The battery cell 20 adopting this structure can make the electrode terminal 25 of the battery cell 20 used to output or input electrical energy and the pressure relief mechanism 70 used to release internal pressure stay away from each other to reduce the risk of using the battery cell 20. For example, the pressure relief mechanism 70 is arranged on the shell 22, and the electrode terminal 25 is arranged on the end cover 21.

[0216] By providing a one-way valve 30, when gas is generated inside the shell during normal use of the battery cell 20, it can be discharged to the outside of the shell through the one-way valve 30, so as to alleviate the phenomenon that the pressure relief mechanism 70 is prematurely actuated to release pressure before the thermal runaway of the battery cell 20 due to the increase of internal air pressure of the battery cell 20, thereby effectively improving the use stability of the battery cell 20, thereby improving the service life and reliability of the battery cell 20.

[0217] In some embodiments, the one-way valve 30 and the pressure relief mechanism 70 may be disposed on the same wall of the housing. For example, the one-way valve 30 and the pressure relief mechanism 70 are both disposed on the end cover 21. The battery cell 20 with such a structure is conducive to saving the space occupied by the battery cell 20, so as to improve the energy density of the battery cell 20.

[0218] In some embodiments, the one-way valve 30 and the pressure relief mechanism 70 may be arranged on different walls of the housing. For example, the one-way valve 30 is arranged on the housing 22, and the pressure relief mechanism 70 is arranged on the end cover 21. The battery cell 20 adopting such a structure can reduce the mutual influence between the one-way valve 30 and the pressure relief mechanism 70, and can be applied to different use environments. Preferably, the one-way valve 30 and the pressure relief mechanism 70 are arranged on the wall at the top of the battery 100 when it is placed, so as to facilitate gas discharge.

[0219] In some embodiments, the actuation pressure of the pressure relief mechanism 70 is greater than the opening pressure of the one-way valve 30, that is, the pressure of the gas inside the shell to open the pressure relief mechanism 70 is greater than the pressure of the gas inside the shell to open the one-way valve 30. When the battery cell 20 has thermal runaway, the gas inside the shell of the battery cell 20 will increase rapidly to open the pressure relief mechanism 70 for pressure relief, while the gas generated inside the shell 21 of the battery cell 20 during normal use can open the one-way valve 30 when it reaches a threshold, but cannot open the pressure relief mechanism 70.

[0220] In some embodiments, the exhaust rate of the one-way valve 30 is less than the exhaust rate of the pressure relief mechanism 70 .

[0221] By setting the exhaust rate of the one-way valve 30 to be lower than the exhaust rate of the pressure relief mechanism 70, the phenomenon that the one-way valve 30 exhausts too quickly and the pressure relief mechanism 70 cannot be actuated to open can be alleviated when the battery cell 20 has thermal runaway. This allows the pressure relief mechanism 70 to actuate and stably discharge the internal pressure of the battery cell 20 when the battery cell 20 has thermal runaway, making it easier to relieve pressure, thereby helping to reduce the risk of fire and explosion of the battery cell 20 when the battery cell 20 has thermal runaway.

[0222] The end cover 21 is provided with a pressure relief hole 701, which is connected to the pressure relief mechanism 70. The diameter of the pressure relief hole 701 may be larger than the diameter of the first exhaust hole 291 connected to the one-way valve 30, so that the exhaust rate of the pressure relief mechanism 70 is greater than the exhaust rate of the one-way valve 30.

[0223] This allows the one-way valve 30 to relieve the pressure relief mechanism 70 from being unable to actuate and open due to excessive exhaust from the one-way valve 30 when the battery cell 20 experiences thermal runaway, so that the pressure relief mechanism 70 can actuate and stably discharge the internal pressure of the battery cell 20 when the battery cell 20 experiences thermal runaway, thereby helping to reduce the risk of fire and explosion of the battery cell 20 when the battery cell 20 experiences thermal runaway. At the same time, the air tightness of the system is also considered to prevent the exhaust rate from being too fast, resulting in poor air tightness, so that the air tightness of the battery 100 system is maintained while exhausting the gas.

[0224] In some embodiments, a liquid injection hole is provided on the end cover 21, and the first exhaust hole 291 for assembling the one-way valve 30 can be the liquid injection hole; that is, after the battery cell 20 is filled with liquid, the one-way valve 30 is assembled on the liquid injection hole, and the one-way valve 30 is used to replace the original sealing structure of the liquid injection hole. By setting the first exhaust hole 291 for assembling the one-way valve 30 as the liquid injection hole, liquid can be injected into the shell through the first exhaust hole 291 before assembling the one-way valve 30 into the first exhaust hole 29128, so that there is no need to open a separate liquid injection hole on the shell, which is beneficial to improving the production efficiency of the battery cell 20 and reducing the manufacturing cost of the battery cell 20. The first exhaust hole 291 and the liquid injection hole can also be arranged at intervals.

[0225] In some embodiments, the battery cell 20 is an alkali metal battery 100, such as a sodium metal battery 100, a lithium metal battery 100, a magnesium metal battery 100, etc. The alkali metal battery 100 is used in conjunction with the exhaust assembly to timely exhaust the gas generated by the alkali metal battery 100 during normal operation, thereby increasing the service life of the alkali metal battery 100.

[0226] Among them, the electrode assembly 23 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 23, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab. The positive electrode tab and the negative electrode tab can be located at one end of the main body or at both ends of the main body respectively. During the charge and discharge process of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the electrode terminals 25 to form a current loop.

[0227] In one embodiment, the positive electrode sheet includes a positive electrode current collector and a positive electrode active layer disposed on at least one side of the positive electrode current collector, and the positive electrode active layer includes a positive electrode active material.

[0228] As an example, the positive electrode current collector has two surfaces opposite to each other in its thickness direction, and the positive electrode active layer may be disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0229] In one embodiment, the positive electrode current collector may be a metal foil or a composite current collector. For example, aluminum foil may be used as the metal foil. The composite current collector may include a polymer material base and a metal layer formed on at least one surface of the polymer material base. 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 (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).

[0230] In one embodiment, the positive electrode material includes one or more of a polyanion positive electrode material, a phosphate positive electrode material, a sulfate positive electrode material, a silicate positive electrode material, and a borate positive electrode material. For example, in the positive electrode active material of the sodium battery 100, the polyanion compound includes a compound based on phosphoric acid and fluorophosphate. The phosphoric acid-based compound includes Nax1Fey1Pm1On1, for example, sodium iron phosphate with a higher capacity and sodium iron pyrophosphate with a higher voltage platform. The polyanion compound includes one or more of sodium vanadium trifluorophosphate Na3V2(PO4)2F3, sodium vanadium fluorophosphate NaVPO4F, sodium vanadium phosphate Na3V2(PO4)3, Na4Fe3(PO4)2P2O7, NaFePO4, and Na3V2(PO4)3. The Prussian blue compound is NaxMM(CN)6, wherein M and M are one or more of Fe, Mn, Co, Ni, Cu, Zn, Cr, Ti, V, Zr, and Ce, and wherein 0<x≤2. The positive electrode active material in the lithium metal battery 100 may include at least one of lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium iron phosphate, lithium cobalt oxide, lithium manganese oxide, or lithium iron manganese phosphate.

[0231] In one embodiment, the negative electrode sheet includes a negative electrode current collector and a negative electrode active layer disposed on at least one surface of the negative electrode current collector, and the negative electrode active layer includes a negative electrode active material. In this embodiment, the battery cell 20 is an ion battery 100, and during the charge and discharge process of the battery 100, active ions (such as Li+, Na+) are embedded / de-embedded in the negative electrode active material.

[0232] As an example, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode active layer may be disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0233] In one embodiment, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, a copper foil may be used. The composite current collector may include a polymer material base layer and a metal layer formed on at least one surface of the polymer material substrate. The composite current collector may be obtained 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 (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).

[0234] In one embodiment, the negative electrode active material may include one or more of a silicon-based material, a silicon-carbon material, a carbon material, and a selenium-based material. Specifically, it includes one or more of artificial graphite, natural graphite, hard carbon, soft carbon, a silicon-based material, and a selenium-based material. The silicon-based material may be selected from one or more of elemental silicon, silicon oxide compounds (such as silicon monoxide), silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The selenium-based material may be selected from one or more of elemental selenium, selenium oxide compounds, and selenium alloys.

[0235] In one embodiment, the negative electrode plate includes a negative electrode current collector and a carbonaceous coating disposed on at least one surface of the negative electrode current collector. In this embodiment, the battery cell 20 is a metal battery 100, and during the charge and discharge process of the battery 100, active ions are deposited / stripped at the negative electrode plate. The metal battery 100 can be an alkali metal battery 100, such as a lithium metal battery 100, a sodium metal battery 100, a potassium metal battery 100, a zinc metal battery 100, and an aluminum metal battery 100. This type of battery 100 can also be referred to as a "negative electrode-free battery 100". During the charging process, sodium metal is formed by depositing active ions (such as Na+) released from the positive electrode active material onto the negative electrode current collector. The provision of a carbonaceous coating facilitates more uniform metal deposition. Carbonaceous materials include one or more of conductive carbon, graphite, hard carbon, and carbon nanotubes.

[0236] In other embodiments, a conductive film layer may also be deposited on the negative electrode current collector. For example, alloy materials, titanium-based materials, active metals (such as sodium metal), carbon-based materials deposited with metals, composite materials containing metals, alloy materials containing metals, etc. The above alloy materials include but are not limited to sodium-tin alloys, sodium-germanium alloys, and sodium-antimony alloys. The above titanium-based materials include but are not limited to titanium dioxide, titanates, and titanium phosphates.

[0237] In one embodiment, the positive electrode active layer and the negative electrode active layer may also include a binder and a conductive agent. As an example, the binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer and fluorine-containing acrylate resin. As an example, the conductive agent may include at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene and carbon nanofibers.

[0238] In one embodiment, the isolation membrane can be any known porous structure isolation membrane with good chemical stability and mechanical stability.

[0239] In one embodiment, the material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The isolation membrane can be a single-layer film or a multi-layer composite film, without particular limitation. When the isolation membrane is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation.

[0240] The electrolyte conducts ions between the positive electrode and the negative electrode. The electrolyte can be liquid, gel or all-solid.

[0241] In some embodiments, the electrolyte is an electrolyte solution. The electrolyte solution includes an electrolyte salt and a solvent. The electrolyte salt dissolves to form electrolyte ions, and conduction is achieved through the movement of the electrolyte ions in the electrolyte salt.

[0242] In one embodiment, in the sodium battery 100, the electrolyte salt includes sodium hexafluorophosphate (NaPF6), sodium bis(fluorosulfonyl)imide (NaFSI), sodium trifluoromethanesulfonate (CF3NaO3S), sodium sulfide (Na2S) and other sodium salts. The lithium battery 100 includes at least one lithium salt selected from lithium perchlorate, lithium hexafluoroarsenate, lithium hexafluorophosphate, lithium bis(trifluoromethylsulfonyl)imide, lithium bis(fluorosulfonyl)imide, lithium difluorooxalatoborate, lithium tetrafluoroborate and lithium trifluoromethanesulfonate.

[0243] In one embodiment, the solvent includes one or more solvents selected from chain ethers, ethylene glycol dimethyl ether and its derivatives, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, and cyclic ethers, including dimethyl ether (DME), diethylene glycol diethyl ether, tetraethylene glycol dimethyl ether, 2,2,2,2-trifluoroethyl ether, ethylene glycol diethyl ether, triethylene glycol dimethyl ether, ethylene glycol dimethyl ether derivatives, methyl trifluoroethyl carbonate (FEMC), dioxolane (DOL), acetonitrile (AN), fluorobenzene, triethyl phosphate (TEP), sulfolane, 2-methyltetrahydrofuran, tetrahydrofuran, dimethyl sulfoxide, N,N-dimethylacetamide, etc.

[0244] In one embodiment, the electrolyte may further include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and may also include additives capable of improving certain properties of the battery 100, such as additives that improve the overcharge performance of the battery 100, additives that improve the high temperature or low temperature performance of the battery 100, and the like.

[0245] According to some embodiments of the present application, the present application further provides a battery 100, the battery 100 comprising a battery cell 20 of any of the above solutions. Fig.23 , Fig.23 1 is a schematic diagram of the exploded structure of a battery 100 according to one or more embodiments. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is accommodated in the box 10. The box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0246] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery 100 module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery 100 modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0247] Each battery cell 20 may be a secondary battery 100 or a primary battery 100; specific examples thereof include all types of primary batteries 100 or secondary batteries 100. For example, it may be a lithium battery 100, a sodium battery 100, a potassium battery 100, or other types of secondary batteries 100. The lithium secondary battery 100 may include a lithium metal secondary battery 100, a lithium ion secondary battery 100, a lithium polymer secondary battery 100, or a lithium ion polymer secondary battery 100. It may also be a lithium sulfur battery 100, a sodium ion battery 100, or a magnesium ion battery 100, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0248] In some embodiments, the battery 100 may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0249] According to some embodiments of the present application, the present application further provides an electric device, which includes a battery cell 20 of any of the above solutions, and the battery cell 20 is used to provide power to the electric device. The electric device can be any of the above devices or systems using the battery cell 20.

[0250] In some embodiments, the purpose of the electric equipment of the present application is not particularly limited, and it can be used for any electronic device known in the prior art. The battery 100 disclosed in the embodiment of the present application can be used for electric equipment using the battery 100 as a power source or various energy storage systems using the battery 100 as an energy storage element. That is, a kind of electric equipment is provided. In some embodiments, the electric equipment of the present application can be used for, but not limited to, notebook computers, pen-input computers, mobile computers, e-book players, portable phones, portable fax machines, portable copiers, portable printers, head-mounted stereo headphones, video recorders, LCD TVs, portable cleaners, portable CD players, mini-discs, transceivers, electronic notepads, calculators, memory cards, portable recorders, radios, backup power supplies, motors, cars, motorcycles, power-assisted bicycles, bicycles, ships, spacecraft, lighting fixtures, toys, game consoles, clocks, power tools, flashlights, cameras, large-scale household batteries 100 and lithium-ion capacitors, etc.

[0251] The electric device can select the battery cell 20, the battery 100 module or the battery 100 pack according to its usage requirements.

[0252] Please refer to Fig.24 , Fig.24: is a schematic diagram of the structure of a vehicle 1000 according to one or more embodiments. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, the head or the tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving.

[0253] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0254] In the above embodiments, by setting a one-way valve 30, the gas inside the battery 100 shell can be discharged to the outside of the shell in time, so that the gas pressure inside the battery 100 shell will not be too high, reducing the risk of premature valve opening of the pressure relief mechanism 70, and greatly improving the life of the battery 100. One or more one-way valves 30 can be set on a battery cell 20, and the setting position and method of each one-way valve 30 can be different. For example, one one-way valve 30 is set on the side of the end cover 21 facing the inside of the battery 100 shell, and one one-way valve 30 is set on the side of the end cover 21 facing the outside of the battery 100 shell. One one-way valve 30 can be set on the end cover 21, and the other one-way valve 30 can be set on the shell 22.

[0255] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: The housing has a wall portion, the wall portion has a first exhaust hole, and the first exhaust hole communicates the interior of the housing with the exterior of the housing; A one-way valve comprises a valve body and a valve core, wherein the valve body has a valve cavity inside, and the valve body is provided with an air inlet and an air outlet, wherein the air inlet connects the valve cavity with the inside of the shell, and the air outlet connects the valve cavity with the outside of the shell; the valve core is arranged in the valve cavity, and the valve core is used to block the air inlet, and the valve core is configured to open the air inlet under the action of the gas inside the shell and release the gas inside the battery cell; the wall portion has an outer surface and an inner surface arranged opposite to each other, the outer surface is arranged toward the outside of the shell, and the inner surface is arranged toward the inside of the shell; the valve body is arranged on the outer surface, and at least part of the valve body protrudes from the outer surface.

2. The battery cell according to claim 1, characterized in that: The valve body comprises: Valve seat; The valve cover comprises a cover top wall and a cover side wall connected to the cover top wall, wherein the cover top wall, the cover side wall and the valve seat enclose the valve cavity, the valve seat is provided with an air inlet of the valve cavity, and the valve cover is provided with the air outlet; the valve seat has a first through hole penetrating the valve seat, and the air inlet is the first through hole.

3. The battery cell according to claim 2, characterized in that: The cover side wall has a second through hole penetrating the cover side wall, and the air outlet is the second through hole.

4. The battery cell according to claim 3, characterized in that: The second through hole extends to the end of the cover side wall in a direction away from the cover top wall; Optionally, there are a plurality of the second through holes, and the plurality of the second through holes are spaced apart and distributed in the circumferential direction of the cover side wall.

5. The battery cell according to any one of claims 2 to 4, characterized in that: A first guide column is protruding from the side of the cover top wall facing the valve cavity, and a third through hole is provided on the cover top wall, penetrating the cover top wall and the first guide column; or a third through hole is provided on the cover top wall, penetrating the cover top wall, and the air outlet is the third through hole.

6. The battery cell according to claim 5, characterized in that: The valve cover also includes a flange wall, the cover side wall connects the cover top wall and the flange wall, the flange wall extends toward a side away from the valve cavity relative to the cover side wall, and the flange wall is connected to the valve seat.

7. The battery cell according to claim 6, characterized in that: A first recessed groove that is recessed relative to the surface of the valve seat is disposed on a side of the valve seat that faces the valve cover, and at least a portion of the flange wall is accommodated in the first recessed groove and connected to the valve seat.

8. The battery cell according to claim 7, characterized in that: The valve seat is provided with a first step surface and a second step surface on a side facing the valve cover. The first step surface is closer to the valve cover than the second step surface. The first sink groove is provided on the first step surface.

9. The battery cell according to claim 7 or 8, characterized in that: The surface of the flange wall facing the cover top wall is flush with the surface of the valve seat facing the valve cover; or the surface of the flange wall facing the cover top wall is lower than the surface of the valve seat facing the valve cover.

10. The battery cell according to claim 9, characterized in that: The flange wall is welded to the valve seat; wherein, in the circumferential direction of the cover side wall, at least a portion of a first weld mark between the flange wall and the valve seat is staggered with a second through hole on the cover side wall.

11. The battery cell according to claim 6, characterized in that: The outer circumferential surface of the valve seat is provided with a connecting protrusion, and the inner circumferential surface of the flange wall is provided with a receiving groove. The connecting protrusion is received in the receiving groove and connected to the flange wall.

12. The battery cell according to claim 11, characterized in that: The connecting protrusion is welded to the flange wall, wherein the flange wall has an upper surface and a lower surface arranged opposite to each other, the upper surface is arranged toward the top wall of the cover, and a second weld mark of the connecting protrusion and the flange wall is located on the lower surface of the flange wall.

13. The battery cell according to claim 1, characterized in that: The valve body includes a valve cover, and the valve cover includes a cover top wall and a cover side wall connected to the cover top wall. The cover top wall, the cover side wall and the wall portion enclose the valve cavity. The first exhaust hole is the air inlet of the valve cavity, and the valve cover is provided with an air outlet of the valve cavity.

14. The battery cell according to claim 13, characterized in that: The side of the wall portion facing the outside of the shell is provided with a second groove recessed relative to the outer surface of the wall portion, and the valve cover also includes a flange wall, the cover side wall connects the cover top wall and the flange wall, the flange wall extends relative to the cover side wall toward the side away from the valve cavity, and at least a portion of the flange wall is accommodated in the second groove and connected to the wall portion.

15. The battery cell according to any one of claims 1-4, 7-8, 10-14, characterized in that: The valve core comprises: An elastic member, disposed in the valve cavity; A blocking member is movably disposed in the valve cavity, and is used to block the air inlet under the action of the elastic member, and is used to open the air inlet under the action of the gas inside the shell.

16. The battery cell according to claim 15, characterized in that: The valve body comprises a valve cover, a first guide column is protrudingly provided on a side of the valve cover facing the blocking member, and a portion of the elastic member is sleeved on the outer side of the first guide column.

17. The battery cell according to claim 16, characterized in that: The diameter of the first guide column is D1, and the inner diameter of the elastic member is D2, which satisfies the condition that 0mm<D2-D1≤5mm.

18. The battery cell according to claim 17, characterized in that: A second guide column is protrudingly provided on one side of the blocking member facing the valve cover, and a portion of the elastic member is sleeved on the outer side of the second guide column.

19. The battery cell according to claim 18, characterized in that: The diameter of the second guide column is D3, and the inner diameter of the elastic member is D2, satisfying 0mm<D3-D1≤5mm.

20. The battery cell according to claim 19, characterized in that: In the axial direction of the elastic member, there is a gap between the end surface of the first guide column away from the valve cover and the end surface of the second guide column close to the valve cover; Optionally, the height H1 of the interval satisfies 0mm<H1≤0.5mm.

21. The battery cell according to any one of claims 16 to 20, characterized in that: In the axial direction of the valve cavity, the two ends of the elastic member abut against the valve cover and the blocking member respectively, the distance between the first abutting surface of the valve cover and the second abutting surface of the blocking member is L1, and the physical length of the elastic member is L2, wherein L1>L2; wherein the physical length of the elastic member is the physical length of the elastic member after the elastic member is fully compressed; Optionally, L1-L2>0.5mm.

22. The battery cell according to claim 21, characterized in that: The elastic member is a spring, and the physical length of the elastic member L2=d1*n1+d2+d3, wherein d1 is the spring wire diameter, n1 is the maximum number of turns of the spring in the axial direction, d2 is the thickness of the outermost spring at one end of the spring, and d3 is the thickness of the outermost spring at the other end of the spring, d2≤d1, d3≤d1.

23. The battery cell according to any one of claims 16 to 20 and 22, characterized in that: The elastic member is a spring, and the material of the elastic member includes steel, iron or aluminum.

24. The battery cell according to claim 23, characterized in that: A plurality of limiting protrusions are convexly disposed on the outer circumferential surface of the blocking member, and the plurality of limiting protrusions are arranged at intervals along the circumferential direction of the blocking member.

25. The battery cell according to claim 24, characterized in that: The blocking member includes a pressing portion and a sealing portion. Two ends of the elastic member respectively abut against the valve cover and the pressing portion. The sealing portion is connected to a side of the pressing portion away from the valve cover. The sealing portion is used to block the air inlet.

26. The battery cell according to claim 25, characterized in that: The sealing part is made of EPDM, fluororubber or Teflon.

27. The battery cell according to claim 26, characterized in that: The valve cover includes a cover side wall having a second through hole penetrating the cover side wall, the air outlet is the second through hole, and along the axial direction of the valve cavity, the sealing interface between the valve core and the valve seat is higher than or flush with the bottom wall of the second through hole.

28. The battery cell according to claim 27, characterized in that: The one-way valve is at least partially accommodated in the first exhaust hole.

29. The battery cell according to claim 28, characterized in that: The first exhaust hole includes a through hole segment and a first hole segment, the through hole segment and the first hole segment are arranged along the thickness direction of the wall portion, the first hole segment is located on the side of the through hole segment away from the interior of the shell, the aperture of the first hole segment is larger than the aperture of the through hole segment, and the one-way valve is at least partially accommodated in the first hole segment.

30. The battery cell according to claim 29, characterized in that The first hole section comprises a hole side surface arranged circumferentially, and the outer peripheral surface of the valve cover / valve seat of the one-way valve is welded to the hole side surface.

31. The battery cell according to claim 30, characterized in that: The valve seat is provided with a first step surface and a second step surface on one side facing the valve cover. The first step surface is closer to the valve cover than the second step surface. The outer peripheral surface of the second step is welded to the side surface of the hole.

32. The battery cell according to claim 30 or 31, characterized in that: The hole side surface matches with the outer peripheral surface of the valve cover / valve seat of the one-way valve, and the hole side wall surface and the outer peripheral surface of the valve cover / valve seat of the one-way valve are both arranged at an acute angle to the central axis of the first exhaust hole.

33. The battery cell according to claim 32, characterized in that: A stress relief groove is provided around the weld mark between the valve cover / valve seat and the wall; Optionally, a first stress relief groove is provided on a surface of the valve seat / valve cover facing the outside of the housing; and / or A second stress release groove is arranged on a surface of one side of the wall portion facing the outside of the housing.

34. The battery cell according to claim 33, characterized in that: The valve body is provided with a weak strength area.

35. The battery cell according to claim 34, characterized in that: The strength weak area includes a thickness weak area.

36. The battery cell according to claim 35, characterized in that The valve body comprises a valve cover, and the valve cover comprises a cover top wall and a cover side wall connected to the cover top wall, and the thickness weakened area comprises a groove arranged on the cover side wall.

37. The battery cell according to claim 36, characterized in that: The cover side wall is provided with a second through hole penetrating the cover side wall, and the groove is arranged on the connecting arm between two adjacent second through holes.

38. The battery cell according to claim 37, characterized in that: The groove is located on a side of the cover side wall facing the valve cavity; or The groove is located on a side of the cover side wall away from the valve cavity.

39. The battery cell according to any one of claims 36 to 38, characterized in that: The thickness weakened area includes a first score groove, which is a circumferential groove on the cover side wall.

40. The battery cell according to any one of claims 36 to 38, characterized in that: The thickness weakened area includes a plurality of second scoring grooves, and the plurality of second scoring grooves are arranged at intervals in the circumferential direction of the cover side wall.

41. The battery cell according to claim 1, characterized in that The battery cell further comprises: The insulating member is arranged on the side of the wall portion facing the inside of the shell; the insulating member is provided with a second exhaust hole penetrating the insulating member, and the second exhaust hole is communicated with the first exhaust hole on the wall portion.

42. The battery cell according to claim 1, characterized in that The first exhaust hole is a liquid injection hole of the battery cell; or The first exhaust hole is spaced apart from the liquid injection hole of the battery cell.

43. The battery cell according to claim 1, characterized in that The housing comprises: A housing having an opening formed therein, wherein the housing is used to accommodate 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; or The wall portion is a wall located at the top of the housing when the battery cell is in a placed state.

44. The battery cell according to claim 1, characterized in that The battery cell further comprises: A pressure relief mechanism is provided on the housing, and is configured to actuate and release the internal pressure of the battery cell when the battery cell is in thermal runaway, and the actuation pressure of the pressure relief mechanism is greater than the opening pressure of the one-way valve.

45. The battery cell according to claim 44, characterized in that The wall portion has a pressure relief hole, the pressure relief hole communicates the inside of the shell with the outside of the shell, and the pressure relief mechanism is arranged in the pressure relief hole; the aperture of the pressure relief hole is larger than the aperture of the first exhaust hole.

46. ​​The battery cell according to claim 44 or 45, characterized in that: The exhaust rate of the one-way valve is lower than the exhaust rate of the pressure relief mechanism.

47. The battery cell according to any one of claims 1, 7-8, 10-14, 16-20, 22, 24-31, 33-38, 41-45, characterized in that: The opening pressure of the one-way valve is greater than or equal to 0.2 MPa; optionally, greater than or equal to 0.4 MPa.

48. The battery cell according to claim 44 or 45, characterized in that: The valve body is provided with a weak strength area, the actuation pressure of the pressure relief mechanism is greater than the actuation pressure of the weak strength area, and the actuation pressure of the weak strength area is greater than the opening pressure of the one-way valve.

49. The battery cell according to any one of claims 1, 7-8, 10-14, 16-20, 22, 24-31, 33-38, 41-45, characterized in that: The aperture of the air inlet is greater than or equal to the aperture of the first exhaust hole.

50. A battery, characterized in that: Comprising a battery cell as described in any one of claims 1-49.

51. An electrical device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 49, wherein the battery cell is used to provide electrical energy.

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