Battery cell, battery apparatus, and electric apparatus

Abstract

The present application relates to the field of batteries, and provides a battery cell, a battery apparatus, and an electric apparatus. The battery cell comprises a casing and a pressure relief mechanism, the casing having a wall portion, and the pressure relief mechanism being disposed on the wall portion. The base material of the pressure relief mechanism is iron. The pressure relief mechanism is provided with a first groove, and the pressure relief mechanism is configured to crack along at least part of the first groove when the pressure inside the casing reaches a threshold, so as to release the pressure. The first groove has a first groove bottom surface, the first groove bottom surface is a cambered surface recessed in a direction away from the opening of the first groove, the cambered surface is arc-shaped on the cross section of the first groove, and the cross section is perpendicular to the extension direction of the first groove. By arranging the groove bottom surface of the first groove as a cambered surface recessed in a direction away from the opening of the first groove, flow of a material when the first groove is formed by stamping is facilitated, which is beneficial to mitigating stress concentration, helping to keep the burst pressure of a plurality of battery cells consistent when the plurality of battery cells are manufactured, thereby improving the reliability of the battery cells.

Description

Battery cell, battery device and electric device TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a battery cell, a battery device and an electric device. BACKGROUND

[0002] Batteries are widely used in the field of new energy, for example, electric vehicles, new energy vehicles, etc. New energy vehicles and electric vehicles have become a new trend in the development of the automobile industry. The development of battery technology needs to consider various design factors, such as energy density, discharge capacity, charge-discharge rate and other performance parameters. In addition, the reliability of the battery also needs to be considered. However, the reliability of the current battery is poor.

[0003] SUMMARY

[0004] The purpose of the embodiments of the present application is to provide a battery cell, a battery device and an electric device, which aims to improve the problem of poor reliability of the battery in the related art.

[0005] In a first aspect, the embodiments of the present application provide a battery cell, which comprises a shell and a pressure relief mechanism, the shell has a wall part; the pressure relief mechanism is arranged on the wall part, the base material of the pressure relief mechanism is iron, the pressure relief mechanism is provided with a first groove, and the pressure relief mechanism is configured to break along at least part of the first groove when the pressure inside the shell reaches a threshold value to release the pressure; wherein the first groove has a first groove bottom surface, the first groove bottom surface is an arc surface recessed in a direction away from the slot opening of the first groove, the arc surface is arc-shaped on a cross section of the first groove, and the cross section is perpendicular to the extension direction of the first groove.

[0006] In the above technical solution, the base material of the pressure relief mechanism is iron, which can effectively improve the structural strength of the pressure relief mechanism, reduce the risk of early valve pressure relief of the pressure relief mechanism, and be beneficial to improving the service life and reliability of the battery cell. By setting the first groove bottom surface of the first groove as an arc surface recessed in a direction away from the slot opening of the first groove, the flow of the material is facilitated when the first groove is formed by stamping, which is beneficial to relieving stress concentration, beneficial to keeping the burst pressure of multiple battery cells consistent when the multiple battery cells are manufactured, and beneficial to improving the reliability of the battery cell.

[0007] As an optional technical solution of the embodiments of the present application, the arc surface is a circular arc surface.

[0008] In the technical solution, the first groove bottom surface is arranged as a circular arc surface recessed in a direction away from the first groove opening, which is more conducive to material flow during stamping forming of the first groove, and is more conducive to relieving stress concentration, and is more conducive to keeping the burst pressure of the plurality of battery monomers consistent when the plurality of battery monomers are manufactured, and is more conducive to improving the reliability of the battery monomer.

[0009] As an optional technical solution of the embodiment of the application, the arc surface defines the opening of the first groove.

[0010] In the technical solution, the arc surface defines the opening of the first groove, and the cross section of the first groove as a whole is arc-shaped, which is conducive to material flow during stamping forming of the first groove, and is conducive to relieving stress concentration, and is conducive to keeping the burst pressure of the plurality of battery monomers consistent when the plurality of battery monomers are manufactured, and is conducive to improving the reliability of the battery monomer.

[0011] As an optional technical solution of the embodiment of the application, the first groove includes a first groove side surface and a second groove side surface, the first groove side surface and the second groove side surface are oppositely arranged along the width direction of the first groove, and the first groove bottom surface connects the first groove side surface and the second groove side surface.

[0012] In the technical solution, the first groove bottom surface connects the first groove side surface and the second groove side surface, the first groove side surface and the second groove side surface are planar, and the first groove bottom surface is arc-shaped, which is conducive to keeping the width of the first groove small when the depth of the first groove is large, and is conducive to controlling the burst pressure of the pressure relief mechanism.

[0013] As an optional technical solution of the embodiment of the application, the first groove side surface and the second groove side surface define the opening of the first groove.

[0014] In the technical solution, the first groove side surface and the second groove side surface define the opening of the first groove, so that the cross-sectional shape of the first groove is relatively simple, which is conducive to reducing the stress between the groove side surface and the first groove bottom surface, relieving stress concentration, keeping the burst pressure of the plurality of battery monomers consistent when the plurality of battery monomers are manufactured, and improving the reliability of the battery monomer.

[0015] As an optional technical solution of the embodiment of the application, the first groove side surface and the second groove side surface are both arranged to be inclined, and the distance between the first groove side surface and the second groove side surface gradually decreases in a direction from the opening to the first groove bottom surface.

[0016] In the technical solution, the first groove side surface and the second groove side surface are both arranged to be inclined, and the distance between the first groove side surface and the second groove side surface gradually decreases in a direction from the opening to the first groove bottom surface, which is conducive to material flow during stamping forming of the first groove and reducing stress concentration.

[0017] As an optional technical solution of the embodiment of the present application, the first groove side is parallel to the second groove side.

[0018] In the above technical solution, when the first groove side and the second groove side are parallel, the width of the first groove is easier to control, which is conducive to keeping the burst pressure of the plurality of battery monomers consistent when the plurality of battery monomers are manufactured, and is conducive to improving the reliability of the battery monomer.

[0019] As an optional technical solution of the embodiment of the present application, the first groove further includes a third groove side and a fourth groove side, the third groove side and the fourth groove side are oppositely arranged along the width direction of the first groove, the first groove side connects one end of the first groove bottom surface and the third groove side, and the second groove side connects the other end of the first groove bottom surface and the fourth groove side.

[0020] In the above technical solution, by arranging the third groove side and the fourth groove side, when the depth of the first groove is large, the width of the first groove is kept small, which is conducive to controlling the burst pressure of the pressure relief mechanism.

[0021] As an optional technical solution of the embodiment of the present application, the third groove side and the fourth groove side define the groove opening of the first groove.

[0022] In the above technical solution, the third groove side and the fourth groove side define the groove opening of the first groove, so that the cross-sectional shape of the first groove is relatively simple, which is conducive to reducing the stress between the adjacent two groove sides and between the groove side and the first groove bottom surface, relieving stress concentration, keeping the burst pressure of the plurality of battery monomers consistent when the plurality of battery monomers are manufactured, and improving the reliability of the battery monomer.

[0023] As an optional technical solution of the embodiment of the present application, the first groove side is parallel to the second groove side; the third groove side and the fourth groove side are both arranged obliquely, and the distance between the third groove side and the fourth groove side gradually decreases from the direction of the groove opening to the direction of the first groove bottom surface.

[0024] In the above technical solution, by making the first groove side parallel to the second groove side, the third groove side and the fourth groove side are both arranged obliquely, and the distance between the third groove side and the fourth groove side gradually decreases from the direction of the groove opening to the direction of the first groove bottom surface, which is conducive to the flow of the material when the first groove is formed by stamping, and reduces stress concentration.

[0025] As an optional technical solution of the embodiment of the present application, the first groove side and the second groove side are both inclined, and the distance between the first groove side and the second groove side gradually decreases from the direction of the slot to the direction of the first groove bottom along the thickness direction of the wall part; the third groove side is parallel to the fourth groove side.

[0026] In the above technical solution, by making the first groove side and the second groove side both inclined, and the distance between the first groove side and the second groove side gradually decreases from the direction of the slot to the direction of the first groove bottom along the thickness direction of the wall part, and the third groove side is parallel to the fourth groove side, the width of the first groove is easier to control, which is conducive to keeping the burst pressure of the plurality of battery monomers consistent when the plurality of battery monomers are manufactured, and is conducive to improving the reliability of the battery monomer.

[0027] As an optional technical solution of the embodiment of the present application, the first groove side and the second groove side are both inclined, and the distance between the first groove side and the second groove side gradually decreases from the direction of the slot to the direction of the first groove bottom; the third groove side and the fourth groove side are both inclined, and the distance between the third groove side and the fourth groove side gradually decreases from the direction of the slot to the direction of the first groove bottom; the angle between the first groove side and the second groove side is a, and the angle between the third groove side and the fourth groove side is b, a>b or a<b.

[0028] In the above technical solution, by making the first groove side and the second groove side both inclined, and making the third groove side and the fourth groove side both inclined, and a>b or a<b, it is conducive to reducing stress concentration when the flow material is punched to form the first groove.

[0029] As an optional technical solution of the embodiment of the present application, the pressure relief mechanism is provided with a second groove, the first groove and the second groove are arranged along the thickness direction of the wall part, the second groove has a second groove bottom, and the slot of the first groove is formed in the second groove bottom.

[0030] In the above technical solution, the slot of the first groove is formed in the first groove bottom of the second groove, and when punch forming, the second groove can be first punched and formed, and then the first groove is punched and formed, thereby reducing the forming force received by the pressure relief mechanism, reducing the risk of cracks of the pressure relief mechanism, and improving the reliability of the battery monomer.

[0031] As an optional technical solution of the embodiment of the present application, the pressure relief mechanism has a first surface and a second surface arranged oppositely in the thickness direction of the wall portion, the second groove includes a plurality of levels of grooves arranged in sequence from the first surface to the second surface, and in two adjacent levels of the grooves, the level of the groove far from the first surface is arranged on the groove bottom surface of the level of the groove close to the first surface; and the groove bottom surface of the level of the groove farthest from the first surface in the plurality of levels of grooves is the second groove bottom surface.

[0032] In the above technical solution, the second groove includes a plurality of levels of grooves, and when the second groove is punched, the plurality of levels of grooves can be punched step by step, thereby reducing the forming force borne by the pressure relief mechanism, reducing the risk of cracks in the pressure relief mechanism, and improving the reliability of the battery monomer. In addition, the first groove is punched in the last step, and there is no other punching step thereafter, which is conducive to maintaining the shape of the first groove, keeping the burst pressure of the plurality of battery monomers consistent when the plurality of battery monomers are manufactured, and improving the reliability of the battery monomer.

[0033] As an optional technical solution of the embodiment of the present application, the pressure relief mechanism is arranged separately from the wall portion, the wall portion is provided with a pressure relief hole, and the pressure relief mechanism is mounted on the wall portion and covers the pressure relief hole.

[0034] In the above technical solution, the pressure relief mechanism is arranged separately from the wall portion and mounted on the wall portion, so as to facilitate processing and manufacturing.

[0035] As an optional technical solution of the embodiment of the present application, the base material of the wall portion is iron, and the pressure relief mechanism is welded to the wall portion.

[0036] In the above technical solution, the base material of the pressure relief mechanism and the wall portion is iron, and the pressure relief mechanism and the wall portion are easy to weld, which is conducive to reducing the phenomenon of welding cracks in the pressure relief mechanism and the wall portion, thereby reducing the risk of liquid leakage of the battery monomer and improving the reliability of the battery monomer.

[0037] As an optional technical solution of the embodiment of the present application, the pressure relief mechanism is integrally formed with the wall portion.

[0038] In the above technical solution, the pressure relief mechanism is integrally formed with the wall portion, without the need for additional welding or bonding processes, which is conducive to reducing the risk of liquid leakage of the pressure relief mechanism. In addition, when produced, the burst pressure of the plurality of battery monomers processed is easy to be consistent.

[0039] As an optional technical solution of the embodiment of the present application, the material of the pressure relief mechanism is 304 stainless steel, 305 stainless steel, or 316 stainless steel.

[0040] In the technical solution, the 304 stainless steel, the 305 stainless steel and the 316 stainless steel have the advantages of corrosion resistance, high temperature resistance and good machining performance, the pressure relief mechanism made of the 304 stainless steel, the 305 stainless steel or the 316 stainless steel has high strength, the risk of deformation of the pressure relief mechanism due to stress can be reduced, the risk of early valve opening pressure relief of the pressure relief mechanism can be reduced, the service life and reliability of the battery monomer can be improved, and the consistency of the detonation pressure of the plurality of battery monomers can be improved.

[0041] In a second aspect, the embodiments of the present application further provide a battery device, which comprises the battery monomer.

[0042] In a third aspect, the embodiments of the present application further provide a power utilization device, which comprises the battery monomer, and the battery monomer is used to provide electric energy for the power utilization device. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0044] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0045] FIG. 2 is an exploded view of a battery device according to some embodiments of the present application;

[0046] FIG. 3 is a structural schematic diagram of a battery monomer according to some embodiments of the present application;

[0047] FIG. 4 is an exploded view of a battery monomer according to some embodiments of the present application;

[0048] FIG. 5 is a top view of a pressure relief mechanism according to some embodiments of the present application;

[0049] FIG. 6 is a sectional view of the position A-A in FIG. 5;

[0050] FIG. 7 is an enlarged view of the position B in FIG. 6;

[0051] FIG. 8 is a partial sectional view of a pressure relief mechanism according to other embodiments of the present application;

[0052] FIG. 9 is a partial sectional view of a pressure relief mechanism according to yet other embodiments of the present application;

[0053] FIG. 10 is a partial sectional view of a pressure relief mechanism according to still other embodiments of the present application;

[0054] Fig. 11 is a partial cross-sectional view of a pressure relief mechanism according to some embodiments of the present application;

[0055] Fig. 12 is a partial cross-sectional view of a pressure relief mechanism according to some other embodiments of the present application;

[0056] Fig. 13 is a cross-sectional view of a pressure relief mechanism according to some other embodiments of the present application.

[0057] Fig. 13 is a cross-sectional view of a pressure relief mechanism according to some other embodiments of the present application. Fig. 13 is a cross-sectional view of a pressure relief mechanism according to some other embodiments of the present application. Fig. 13 is a cross-sectional view of a pressure relief mechanism according to some other embodiments of the present application. DETAILED DESCRIPTION

[0058] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0059] Unless otherwise defined, all the technical and scientific terms used in the present application have the same meanings as those commonly understood by those skilled in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application; the terms “include” and “have” and any variations thereof in the specification of the present application and the claims and the above description of drawings are intended to cover not exclusive inclusion. The terms “first”, “second” and the like in the specification of the present application and the claims or the above description of drawings are used to distinguish different objects, rather than to describe a particular sequence or a primary and secondary relationship.

[0060] Reference to an "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another.

[0061] In the description of the application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0062] The term "and / or" in this application is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0063] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0064] "Multiple" appearing in this application means more than two (including two).

[0065] In the embodiments of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0066] The battery cell includes but is not limited to lithium ion battery, sodium ion battery, sodium lithium ion battery, lithium metal battery, sodium metal battery, lithium sulfur battery, magnesium ion battery, nickel hydrogen battery, nickel cadmium battery, lead-acid battery, etc.

[0067] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can reduce the risk of short circuit of the positive and negative electrodes, and at the same time allow the active ions to pass through.

[0068] In some embodiments, the cathode can be a cathode sheet, which can include a cathode current collector and a cathode active material disposed on at least one surface of the cathode current collector.

[0069] As an example, the cathode current collector has two surfaces opposite in the thickness direction thereof, and the cathode active material is disposed on either one or both of the two opposite surfaces of the cathode current collector.

[0070] As an example, the cathode current collector can employ a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver plating treatment on the surface, stainless steel with a silver plating treatment on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, or the like can be employed. The composite current collector can include a high molecular material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a high molecular material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0071] As an example, the cathode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a cathode active material of a battery cell can also be used. These cathode active materials can be used alone only one or two or more thereof can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFeP04 (which can also be referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnP04), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, lithium cobalt oxide (such as LiCo02), lithium nickel oxide (such as LiNi02), lithium manganese oxide (such as LiMn02, LiMn204), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 02 (which can also be referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 02 (which can also be referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 02 (which can also be referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 02 (which can also be referred to as NCM622 LiNi 0.8 Co 0.1 Mn 0.1 O2(also can be referred to as NCM 811 LiNi 0.85 Co 0.15 Al 0.05 O2) and modified compounds thereof.

[0072] In some embodiments, the positive electrode can employ a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, etc. When the foam metal is used as the positive electrode, the foam metal surface can not be provided with the positive electrode active material, or of course can be provided with the positive electrode active material. As an example, the foam metal can also be filled or / and deposited with a lithium source material, a potassium metal or a sodium metal, the lithium source material being a lithium metal and / or a lithium-rich material.

[0073] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0074] As an example, the negative electrode current collector can employ a metal foil, a foam metal or a composite current collector. For example, as the metal foil, an aluminum with a silver plating surface treatment, a stainless steel with a silver plating surface treatment, a stainless steel, a copper, an aluminum, a nickel, a carbon electrode, carbon, nickel or titanium, etc. can be employed. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0075] As an example, the negative electrode sheet can include the negative electrode current collector and the negative electrode active material provided on at least one surface of the negative electrode current collector.

[0076] As an example, the negative electrode current collector has two opposite surfaces in the thickness direction thereof, and the negative electrode active material is provided on any one or both of the two opposite surfaces of the negative electrode current collector.

[0077] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative active material for a battery cell can also be used. These negative active materials can be used alone or in combination of two or more.

[0078] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0079] In some embodiments, the separator is a separator film. The separator film can be any known porous structure separator film having good chemical stability and mechanical stability.

[0080] As an example, the material of the separator film can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film. When the separator film is a multi-layer composite film, the materials of the layers can be the same or different. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0081] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The electrolyte can be in a liquid state, a gel state, or a solid state. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0082] In some embodiments, the electrolyte salt can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoroboric oxalate, lithium boric oxalate, lithium difluorophosphoric boric oxalate, and lithium tetrafluorophosphoric oxalate.

[0083] In some embodiments, the solvent can include at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butyl sulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be selected from ether solvents. The ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0084] In some embodiments, the gel electrolyte includes a polymer as a backbone network of the electrolyte, and an ionic liquid-lithium salt.

[0085] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound to form the jelly-roll structure.

[0086] In some embodiments, the electrode assembly is in a stack structure.

[0087] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be alternately stacked.

[0088] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked. One positive electrode sheet can be interposed between adjacent folded segments.

[0089] As an example, the positive electrode sheet and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

[0090] As an example, a plurality of separators can be provided, and each of the separators can be interposed between any adjacent positive electrode sheet or negative electrode sheet.

[0091] As an example, the separators can be continuously provided and interposed between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0092] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a polygonal shape.

[0093] In some embodiments, the electrode assembly can include tabs. The tabs can guide current out of the electrode assembly. The tabs can include positive tabs and negative tabs.

[0094] In some embodiments, the battery cell can include a housing. The housing can encapsulate the electrode assembly and other components such as the electrolyte. The housing can be a steel case, an aluminum case, a plastic case (e.g., polypropylene), a composite metal case (e.g., a copper-aluminum composite case), or an aluminum-plastic film.

[0095] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, the housing can serve to protect the electrode assembly and to some extent prevent leakage of electrolyte and the like. When the housing is a non-sealed structure, the housing can serve to protect the electrode assembly, and a sealing bag can be further included between the housing and the electrode assembly for encapsulating the electrode assembly and electrolyte and the like. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum plastic film.

[0096] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, and the like.

[0097] The battery apparatus referred to in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar member.

[0098] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into one independent module.

[0099] As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0100] In some embodiments, the battery apparatus can be a battery pack, which can include a case and one or more battery cell assemblies accommodated in the case.

[0101] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the case by fixing the battery module in the case.

[0102] As an example, the battery cell assembly can also be accommodated in the case by directly fixing a plurality of battery cells in the case.

[0103] As an example, the case can include a first case body and a second case body. The first case body and the second case body are coupled so that an enclosed space is formed inside the case to accommodate the battery cell assembly. Here, the enclosed means covered or closed, which can be sealed or non-sealed. The first case body can be a top cover or a bottom plate.

[0104] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that an enclosed space is formed inside the box to accommodate the battery monomer assembly.

[0105] As an example, the box can be part of a chassis structure of a vehicle. For example, the top cover of the box can become at least part of the floor of the vehicle, or the frame of the box can become at least part of the cross beam and the longitudinal beam of the vehicle.

[0106] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box, at least one side of the box being provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0107] At present, from the development of market situation, the application of batteries is more and more widely. Batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of batteries, the demand of the market is also increasing.

[0108] Batteries are widely used in the field of new energy, such as electric vehicles, new energy vehicles, etc. New energy vehicles and electric vehicles have become a new trend of development in the automobile industry. The development of battery technology needs to consider many design factors, such as energy density, discharge capacity, charge-discharge rate and other performance parameters. In addition, the reliability of the battery also needs to be considered. However, the reliability of the current battery is poor.

[0109] In order to improve the reliability of the battery monomer, the existing technology sets a pressure relief mechanism on the end cover of the battery monomer, and the pressure relief mechanism is provided with a notch groove. When the internal pressure of the battery monomer reaches the burst pressure, the notch groove is cracked to release the internal pressure of the battery monomer, so as to reduce the risk of explosion and fire of the battery monomer.

[0110] The pressure relief mechanism in the prior art is generally made of aluminum material. The aluminum material pressure relief mechanism has low strength, and the weak part is easy to crack under the action of internal pressure change or external impact of the battery monomer. That is, the weak part has been cracked before the internal pressure of the battery monomer reaches the expected burst pressure, resulting in early scrapping of the battery monomer, and the reliability of the battery monomer is poor.

[0111] If only a material with higher strength is used to manufacture the pressure relief mechanism, due to the higher strength of the material, it is difficult to flow the material when the score groove is formed by stamping, which is prone to stress concentration, so that when a plurality of battery monomers are manufactured, the burst pressures of the plurality of battery monomers are greatly different. Some battery monomers have a weak part that has already cracked before the internal pressure reaches the burst pressure, and some battery monomers have a weak part that has not yet cracked after the internal pressure exceeds the burst pressure, which increases the risk of explosion and fire of the battery monomer, and leads to poor reliability of the battery monomer.

[0112] In view of this, the embodiments of the present application provide a battery monomer, which comprises a shell and a pressure relief mechanism. The shell has a wall part, and the pressure relief mechanism is arranged on the wall part. The base material of the pressure relief mechanism is iron. The pressure relief mechanism is provided with a first groove, and is configured to crack along at least part of the first groove when the pressure inside the shell reaches a threshold value, so as to release the pressure. The first groove has a first groove bottom surface, which is an arc surface recessed in a direction away from the slot opening of the first groove, and the arc surface is arc-shaped in the cross section of the first groove. The cross section is perpendicular to the extension direction of the first groove.

[0113] The base material of the pressure relief mechanism is iron, which can effectively improve the structural strength of the pressure relief mechanism, reduce the risk of early valve pressure relief of the pressure relief mechanism, and be beneficial to improving the service life and reliability of the battery monomer. By setting the first groove bottom surface of the first groove as an arc surface recessed in a direction away from the slot opening of the first groove, it is convenient to flow the material when the first groove is formed by stamping, which is beneficial to relieving stress concentration, beneficial to keeping the burst pressures of the plurality of battery monomers consistent when the plurality of battery monomers are manufactured, and beneficial to improving the reliability of the battery monomer.

[0114] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery monomers and battery devices, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc.

[0115] The following embodiments are described for convenience of illustration, taking the electric device as a vehicle as an example.

[0116] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as the operating power supply of the vehicle 1000.

[0117] The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is configured to control the battery device 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0118] In some embodiments of the present application, the battery device 100 can not only serve as a power source for operating 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.

[0119] Referring to FIG. 2, FIG. 2 is an exploded view of the battery device 100 according to some embodiments of the present application. The battery device 100 can include a box body 10 and a battery cell 20, and the box body 10 is configured to accommodate the battery cell 20.

[0120] The box body 10 can have various structures. In some embodiments, the box body 10 can include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 are coupled to each other. The first box body 11 and the second box body 12 can have various shapes, such as a cuboid, a cylinder, etc. The first box body 11 can be a hollow structure with one side open, and the second box body 12 can also be a hollow structure with one side open. The open side of the second box body 12 is coupled to the open side of the first box body 11, and the box body 10 with a closed space is formed. Alternatively, the first box body 11 can be a hollow structure with one side open, and the second box body 12 can be a plate structure. The second box body 12 is coupled to the open side of the first box body 11, and the box body 10 with an accommodation space is formed.

[0121] In the battery device 100, the battery cell 20 can be one or multiple. If the battery cell 20 is multiple, the multiple battery cells 20 can be connected in series, in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be connected in series, in parallel or in a mixed manner to form a battery module, and the multiple battery modules are connected in series, in parallel or in a mixed manner to form a whole, which is accommodated in the box body 10. Alternatively, all the battery cells 20 can be directly connected in series, in parallel or in a mixed manner, and the whole formed by the battery cells 20 is accommodated in the box body 10.

[0122] In some embodiments, the battery device 100 can further include a current collecting component, and the multiple battery cells 20 can be electrically connected through the current collecting component to realize the series connection, parallel connection or mixed connection of the multiple battery cells 20. The current collecting component can be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0123] Please refer to FIG. 3, FIG. 4, FIG. 5, FIG. 6 and FIG. 7. FIG. 3 is a structural schematic diagram of a battery cell 20 according to some embodiments of the present application. FIG. 4 is an exploded view of the battery cell 20 according to some embodiments of the present application. FIG. 5 is a top view of a pressure relief mechanism 24 according to some embodiments of the present application. FIG. 6 is a sectional view of the position A-A in FIG. 5. FIG. 7 is an enlarged view of the position B in FIG. 6. The embodiments of the present application provide a battery cell 20, which includes a housing 21 having a wall portion 213 and a pressure relief mechanism 24 disposed on the wall portion 213. The base material of the pressure relief mechanism 24 is iron. The pressure relief mechanism 24 is provided with a first groove 241, and is configured to break along at least part of the first groove 241 when the pressure inside the housing 21 reaches a threshold value, so as to release the pressure. The first groove 241 has a first groove bottom surface 2411, which is an arc surface recessed in a direction away from a groove opening 2412 of the first groove 241, and the arc surface is arc-shaped in a cross section of the first groove 241. The cross section is perpendicular to the extension direction of the first groove 241.

[0124] The battery cell 20 refers to the smallest unit constituting the battery device 100.

[0125] The housing 21 includes a shell 211 having an open-ended accommodating space for accommodating the electrode assembly 23, and an end cover 212 connected to the shell 211 and closing the opening.

[0126] The end cover 212 refers to a component covering the opening of the shell 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover 212 can be adapted to the shape of the shell 211 to fit the shell 211. Alternatively, the end cover 212 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 212 is less likely to deform when subjected to extrusion and collision, enabling the battery cell 20 to have higher structural strength and improved reliability. The material of the end cover 212 can include but is not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The end cover 212 is also provided with an electrode terminal 25 for electrically connecting with the tab 232 of the electrode assembly 23 to input or output the electric energy of the battery cell 20. The electrode terminal 25 can be directly connected with the tab 232, such as being directly welded with the tab 232. The electrode terminal 25 can also be indirectly connected with the tab 232, such as being indirectly connected with the tab 232 through a current collecting member. The battery cell 20 further includes an insulating member 27 disposed on the inner side of the end cover 212, which can be used to isolate the electrically connected components inside the shell 211 from the end cover 212 to reduce the risk of short circuit. Exemplarily, the insulating member 27 can be plastic, rubber, etc.

[0127] The shell 211 is a component for fitting the end cover 212 to form an internal environment of the battery cell 20, where the formed internal environment can be used to accommodate the electrode assembly 23, electrolyte, and other components. The shell 211 and the end cover 212 can be independent components, and an opening can be provided on the shell 211, and the end cover 212 is fitted to cover the opening to form the internal environment of the battery cell 20. Without limitation, the end cover 212 and the shell 211 can also be integrated, specifically, the end cover 212 and the shell 211 can form a common joint surface before other components enter the shell, and when it is necessary to seal the internal environment of the shell 211, the end cover 212 is fitted to cover the shell 211. The shell 211 can be various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the shell 211 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 211 can include, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0128] The electrode assembly 23 is a component where electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 23 can be contained in the shell 211. The electrode assembly 23 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and an isolation film is usually provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a portion with active material constituting a main body 231 of the electrode assembly 23, and a portion without active material constituting a tab 232 of the positive electrode sheet and the negative electrode sheet, respectively. The positive tab and the negative tab can be located together at one end of the main body 231 or at two ends of the main body 231, respectively. During the charging and discharging process of the battery cell 20, the positive active material and the negative active material react with the electrolyte.

[0129] The wall portion 213 can be the end cover 212 of the housing 21, or a wall of the shell 211 of the housing 21. Exemplarily, in FIGS. 3 and 4, the wall portion 213 is the end cover 212. In other embodiments, the wall portion 213 is a bottom wall of the shell 211 opposite to the end cover 212. In yet other embodiments, the wall portion 213 can also be a side wall of the shell 211 adjacent to and connected with the end cover 212.

[0130] The pressure relief mechanism 24 is a component for opening when the internal pressure or temperature of the battery cell 20 reaches the burst pressure, to release the internal pressure of the battery cell 20. The pressure relief mechanism 24 is a component mounted on the wall portion 213, and is provided separately from the wall portion 213 and connected thereto. At the time of manufacture, a pressure relief hole 2131 is formed in the wall portion 213, and the pressure relief mechanism 24 and the wall portion 213 are provided separately and finally connected together so that the pressure relief mechanism 24 covers the pressure relief hole 2131. For example, the pressure relief mechanism 24 can be welded to the wall portion 213. The pressure relief mechanism 24 can be a rupture disc mounted on the wall portion 213. Which wall of the housing 21 is the wall portion 213 can be determined by the position at which the pressure relief mechanism 24 is provided. For example, when the pressure relief mechanism 24 is provided at the end cover 212, the end cover 212 is the wall portion 213. When the pressure relief mechanism 24 is provided at the bottom wall of the case 211, the bottom wall is the wall portion 213. When the pressure relief mechanism 24 is provided at the side wall of the case 211, the side wall is the wall portion 213.

[0131] "the base material of the pressure relief mechanism 24 is iron" means that the material having the largest mass percentage among the materials of the pressure relief mechanism 24 is iron. For example, the material of the pressure relief mechanism 24 can be carbon steel or stainless steel. The carbon steel can be low carbon steel, medium carbon steel, or high carbon steel.

[0132] The first groove 241 is a pressure relief groove provided in the pressure relief mechanism 24, and when the pressure inside the battery cell 20 reaches the burst pressure of the pressure relief mechanism 24, the pressure relief mechanism 24 can be split along at least a portion of the first groove 241 to open the pressure relief. It can be understood that the pressure relief mechanism 24 can be split along the entire first groove 241 or along a portion of the first groove 241 when the battery cell 20 is pressure relieved. The first groove 241 can be an annular groove, for example, the first groove 241 can be a circular ring, an elliptical ring. The first groove 241 can also be a non-annular groove, for example, the first groove 241 can be a C-shaped groove, a U-shaped groove, etc.

[0133] Please refer to FIG. 7, the thickness direction of the wall portion 213 is the Z direction shown in the figure.

[0134] The first groove bottom surface 2411 is the groove bottom surface of the first groove 241, and in the thickness direction of the wall portion 213, the first groove bottom surface 2411 is the surface of the first groove 241 farthest from the slot opening 2412 of the first groove 241. The first groove bottom surface 2411 is a curved surface, and the first groove bottom surface 2411 is concave in the direction away from the slot opening 2412 of the first groove 241.

[0135] The first groove 241 can include at least one groove segment, and a first groove bottom surface 2411 corresponding to the groove segment is arc-shaped in a cross section of the groove segment, which is perpendicular to an extension direction of the groove segment. For example, the groove segment can be a straight groove extending along a straight trajectory, and the cross section is perpendicular to the straight trajectory. The groove segment can also be a circular arc groove extending along a circular arc trajectory, and the cross section is perpendicular to the circular arc trajectory.

[0136] In some embodiments, the arc can be a circular arc. In other embodiments, the arc can be an elliptical arc. In yet other embodiments, the arc can be a parabolic arc.

[0137] The base material of the pressure relief mechanism 24 is iron, which can effectively improve the structural strength of the pressure relief mechanism 24, reduce the risk of early valve pressure relief of the pressure relief mechanism 24, and be beneficial to improving the service life and reliability of the battery monomer 20. By setting the first groove bottom surface 2411 of the first groove 241 as an arc surface recessed in a direction away from the slot opening 2412 of the first groove 241, it is convenient to flow the material when stamping and forming the first groove 241, which is beneficial to relieving stress concentration, beneficial to keeping the burst pressure of the plurality of battery monomers 20 consistent when manufacturing the plurality of battery monomers 20, and beneficial to improving the reliability of the battery monomer 20.

[0138] Please refer to FIG. 3, FIG. 4, FIG. 5, FIG. 6 and FIG. 7, in some embodiments, the arc surface is a circular arc surface.

[0139] When the arc surface is a circular arc surface, the arc surface is circular arc-shaped in the cross section of the first groove 241.

[0140] By setting the first groove bottom surface 2411 of the first groove 241 as a circular arc surface recessed in a direction away from the slot opening 2412 of the first groove 241, it is more convenient to flow the material when stamping and forming the first groove 241, which is more beneficial to relieving stress concentration, more beneficial to keeping the burst pressure of the plurality of battery monomers 20 consistent when manufacturing the plurality of battery monomers 20, and more beneficial to improving the reliability of the battery monomer 20.

[0141] Please refer to FIG. 3, FIG. 4, FIG. 5, FIG. 6 and FIG. 7, in some embodiments, the arc surface defines the slot opening 2412 of the first groove 241.

[0142] The arc surface defines the slot opening 2412 of the first groove 241, and the cross section of the first groove 241 is arc-shaped as a whole.

[0143] By making the cross section of the first groove 241 arc-shaped as a whole, it is convenient to flow the material when stamping and forming the first groove 241, which is beneficial to relieving stress concentration, beneficial to keeping the burst pressure of the plurality of battery monomers 20 consistent when manufacturing the plurality of battery monomers 20, and beneficial to improving the reliability of the battery monomer 20.

[0144] Please refer to FIG. 8, which is a partial cross-sectional view of the pressure relief mechanism 24 according to some embodiments of the present application. In some embodiments, the first groove 241 includes a first groove side surface 2413 and a second groove side surface 2414, which are oppositely arranged along the width direction of the first groove 241. The first groove bottom surface 2411 connects the first groove side surface 2413 and the second groove side surface 2414.

[0145] Please refer to FIG. 8, the width direction of the first groove 241 is the X direction shown in the figure.

[0146] The first groove side surface 2413 and the second groove side surface 2414 are both planar. The first groove side surface 2413 is connected to one end of the first groove bottom surface 2411, and the second groove side surface 2414 is connected to the other end of the first groove bottom surface 2411. The first groove side surface 2413 is oppositely arranged with the second groove side surface 2414 along the width direction of the first groove 241.

[0147] The first groove bottom surface 2411 connects the first groove side surface 2413 and the second groove side surface 2414. The first groove side surface 2413 and the second groove side surface 2414 are planar, and the first groove bottom surface 2411 is arc-shaped. This facilitates maintaining a smaller width of the first groove 241 when the depth of the first groove 241 is larger, and facilitates controlling the burst pressure of the pressure relief mechanism 24.

[0148] Please refer to FIG. 8, in some embodiments, the first groove side surface 2413 and the second groove side surface 2414 define the groove opening 2412 of the first groove 241.

[0149] One end of the first groove side surface 2413 is connected to one end of the first groove bottom surface 2411, and one end of the second groove side surface 2414 is connected to the other end of the first groove bottom surface 2411. The other end of the first groove side surface 2413 and the other end of the second groove side surface 2414 together define the groove opening 2412 of the first groove 241.

[0150] The first groove side surface 2413 and the second groove side surface 2414 define the groove opening 2412 of the first groove 241, which makes the cross-sectional shape of the first groove 241 relatively simple. This is conducive to reducing the stress between the groove side surface and the first groove bottom surface 2411, relieving stress concentration, facilitating maintaining the burst pressure of the plurality of battery monomers 20 consistent when manufacturing the plurality of battery monomers 20, and improving the reliability of the battery monomer 20.

[0151] Please refer to FIG. 8, in some embodiments, the first groove side surface 2413 and the second groove side surface 2414 are both inclined. The distance between the first groove side surface 2413 and the second groove side surface 2414 gradually decreases from the direction of the groove opening 2412 to the direction of the first groove bottom surface 2411.

[0152] The first groove side surface 2413 and the second groove side surface 2414 are both inclined, and the inclination degrees of the first groove side surface 2413 and the second groove side surface 2414 can be the same or different. Please refer to FIG. 8, in the embodiment shown in FIG. 8, the inclination degrees of the first groove side surface 2413 and the second groove side surface 2414 are the same.

[0153] In the projection plane perpendicular to the thickness direction of the wall portion 213, the orthographic projection of the first groove side surface 2413 and the orthographic projection of the first groove bottom surface 2411 do not overlap, and the orthographic projection of the second groove side surface 2414 and the orthographic projection of the first groove bottom surface 2411 do not overlap.

[0154] By inclining the first groove side surface 2413 and the second groove side surface 2414, the distance between the first groove side surface 2413 and the second groove side surface 2414 gradually decreases from the direction in which the slot 2412 points to the first groove bottom surface 2411, which is beneficial to the flow of the material when the first groove 241 is formed by stamping, and reduces stress concentration.

[0155] Please refer to FIG. 9, which is a partial cross-sectional view of the pressure relief mechanism 24 provided by some embodiments of the present application. In some embodiments, the first groove side surface 2413 is parallel to the second groove side surface 2414.

[0156] The first groove side surface 2413 is parallel to the thickness direction of the wall portion 213, and the second groove side surface 2414 is also parallel to the thickness direction of the wall portion 213.

[0157] When the first groove side surface 2413 and the second groove side surface 2414 are parallel, the width of the first groove 241 is easier to control, which is beneficial to keeping the burst pressure of the plurality of battery monomers 20 consistent when manufacturing the plurality of battery monomers 20, and is beneficial to improving the reliability of the battery monomer 20.

[0158] Please refer to FIG. 10, which is a partial cross-sectional view of the pressure relief mechanism 24 provided by some embodiments of the present application. In some embodiments, the first groove 241 further includes a third groove side surface 2415 and a fourth groove side surface 2416, which are oppositely arranged along the width direction of the first groove 241. The first groove side surface 2413 connects one end of the first groove bottom surface 2411 and the third groove side surface 2415, and the second groove side surface 2414 connects the other end of the first groove bottom surface 2411 and the fourth groove side surface 2416.

[0159] The third groove side surface 2415 and the fourth groove side surface 2416 are both planar surfaces. The third groove side surface 2415 is connected to an end of the first groove side surface 2413 that is distal from the first groove bottom surface 2411, and the fourth groove side surface 2416 is connected to an end of the second groove side surface 2414 that is distal from the first groove bottom surface 2411. The third groove side surface 2415 is disposed opposite the fourth groove side surface 2416 along a width direction of the first recess 241.

[0160] By providing the third groove side surface 2415 and the fourth groove side surface 2416, it is facilitated to maintain a small width of the first recess 241 when the depth of the first recess 241 is large, and it is facilitated to control the burst pressure of the pressure relief mechanism 24.

[0161] Referring to FIG. 10, in some embodiments, the third groove side surface 2415 and the fourth groove side surface 2416 define the slot opening 2412 of the first recess 241.

[0162] One end of the third groove side surface 2415 is connected to an end of the first groove side surface 2413 that is distal from the first groove bottom surface 2411, and one end of the fourth groove side surface 2416 is connected to an end of the second groove side surface 2414 that is distal from the first groove bottom surface 2411. The other end of the third groove side surface 2415 and the other end of the fourth groove side surface 2416 together define the slot opening 2412 of the first recess 241.

[0163] The third groove side surface 2415 and the fourth groove side surface 2416 define the slot opening 2412 of the first recess 241, which makes the cross-sectional shape of the first recess 241 relatively simple. This is conducive to reducing stress between adjacent groove side surfaces, between a groove side surface and the first groove bottom surface 2411, and alleviating stress concentration. This is conducive to maintaining uniform burst pressures of the plurality of battery cells 20 when the plurality of battery cells 20 are manufactured, and is conducive to improving the reliability of the battery cells 20.

[0164] Referring to FIG. 10, in some embodiments, the first groove side surface 2413 is parallel to the second groove side surface 2414. The third groove side surface 2415 and the fourth groove side surface 2416 are both inclined, and the distance between the third groove side surface 2415 and the fourth groove side surface 2416 gradually decreases in a direction from the slot opening 2412 toward the first groove bottom surface 2411.

[0165] The first groove side surface 2413 is parallel to the thickness direction of the wall portion 213, and the second groove side surface 2414 is also parallel to the thickness direction of the wall portion 213.

[0166] The third groove side surface 2415 and the fourth groove side surface 2416 are both inclined, and the inclination degrees of the third groove side surface 2415 and the fourth groove side surface 2416 can be the same or different. Please refer to FIG. 10, in the embodiment shown in FIG. 10, the inclination degrees of the third groove side surface 2415 and the fourth groove side surface 2416 are the same.

[0167] In the projection plane perpendicular to the thickness direction of the wall portion 213, the orthogonal projection of the third groove side surface 2415 and the orthogonal projection of the first groove bottom surface 2411 do not overlap, and the orthogonal projection of the fourth groove side surface 2416 and the orthogonal projection of the first groove bottom surface 2411 do not overlap.

[0168] By making the first groove side surface 2413 parallel to the second groove side surface 2414, the third groove side surface 2415 and the fourth groove side surface 2416 are both inclined, and the distance between the third groove side surface 2415 and the fourth groove side surface 2416 gradually decreases from the direction of the slot opening 2412 to the direction of the first groove bottom surface 2411, which is conducive to the flow of the material when the first groove 241 is formed by stamping, and reduces stress concentration.

[0169] Please refer to FIG. 11, which is a partial cross-sectional view of the pressure relief mechanism 24 provided by some embodiments of the present application. In some embodiments, the first groove side surface 2413 and the second groove side surface 2414 are both inclined, and along the thickness direction of the wall portion 213, the distance between the first groove side surface 2413 and the second groove side surface 2414 gradually decreases from the direction of the slot opening 2412 to the direction of the first groove bottom surface 2411. The third groove side surface 2415 is parallel to the fourth groove side surface 2416.

[0170] The first groove side surface 2413 and the second groove side surface 2414 are both inclined, and the inclination degrees of the first groove side surface 2413 and the second groove side surface 2414 can be the same or different. Please refer to FIG. 11, in the embodiment shown in FIG. 11, the inclination degrees of the first groove side surface 2413 and the second groove side surface 2414 are the same. In the projection plane perpendicular to the thickness direction of the wall portion 213, the orthogonal projection of the first groove side surface 2413 and the orthogonal projection of the first groove bottom surface 2411 do not overlap, and the orthogonal projection of the second groove side surface 2414 and the orthogonal projection of the first groove bottom surface 2411 do not overlap.

[0171] The third groove side surface 2415 is parallel to the thickness direction of the wall portion 213, and the fourth groove side surface 2416 is also parallel to the thickness direction of the wall portion 213.

[0172] By inclining the first groove side surface 2413 and the second groove side surface 2414, the distance between the first groove side surface 2413 and the second groove side surface 2414 gradually decreases from the direction of the slot opening 2412 to the direction of the first groove bottom surface 2411 along the thickness direction of the wall portion 213, the third groove side surface 2415 is parallel to the fourth groove side surface 2416, so that the width of the first groove 241 is more easily controlled, which is conducive to keeping the burst pressure of the plurality of battery monomers 20 consistent when manufacturing the plurality of battery monomers 20, and is conducive to improving the reliability of the battery monomer 20.

[0173] Please refer to FIG. 12, which is a partial cross-sectional view of the pressure relief mechanism 24 provided by some other embodiments of the application. In some other embodiments, the first groove side surface 2413 and the second groove side surface 2414 are both inclined, and the distance between the first groove side surface 2413 and the second groove side surface 2414 gradually decreases from the direction of the slot opening 2412 to the direction of the first groove bottom surface 2411. The third groove side surface 2415 and the fourth groove side surface 2416 are both inclined, and the distance between the third groove side surface 2415 and the fourth groove side surface 2416 gradually decreases from the direction of the slot opening 2412 to the direction of the first groove bottom surface 2411. The angle of the first groove side surface 2413 and the second groove side surface 2414 is a, and the angle of the third groove side surface 2415 and the fourth groove side surface 2416 is b, a > b or a < b.

[0174] The first groove side surface 2413 and the second groove side surface 2414 are both inclined, and the inclination of the first groove side surface 2413 and the second groove side surface 2414 can be the same, or the inclination of the first groove side surface 2413 and the second groove side surface 2414 can be different. Please refer to FIG. 12, in the embodiment shown in FIG. 12, the inclination of the first groove side surface 2413 and the second groove side surface 2414 is the same. In the projection plane perpendicular to the thickness direction of the wall portion 213, the orthographic projection of the first groove side surface 2413 and the orthographic projection of the first groove bottom surface 2411 do not overlap, and the orthographic projection of the second groove side surface 2414 and the orthographic projection of the first groove bottom surface 2411 do not overlap.

[0175] The third groove side surface 2415 and the fourth groove side surface 2416 are both inclined, and the inclination of the third groove side surface 2415 and the fourth groove side surface 2416 can be the same, or the inclination of the third groove side surface 2415 and the fourth groove side surface 2416 can be different. Please refer to FIG. 12, in the embodiment shown in FIG. 12, the inclination of the third groove side surface 2415 and the fourth groove side surface 2416 is the same. In the projection plane perpendicular to the thickness direction of the wall portion 213, the orthographic projection of the third groove side surface 2415 and the orthographic projection of the first groove bottom surface 2411 do not overlap, and the orthographic projection of the fourth groove side surface 2416 and the orthographic projection of the first groove bottom surface 2411 do not overlap.

[0176] a is the angle of the first groove side surface 2413 and the second groove side surface 2414. b is the angle of the third groove side surface 2415 and the fourth groove side surface 2416. a≠b, that is, the angle of the first groove side surface 2413 and the second groove side surface 2414 is not equal to the angle of the third groove side surface 2415 and the fourth groove side surface 2416.

[0177] Please refer to FIG. 12, in the embodiment shown in FIG. 12, b>a, that is, the angle of the third groove side surface 2415 and the fourth groove side surface 2416 is greater than the angle of the first groove side surface 2413 and the second groove side surface 2414.

[0178] In other embodiments, b

[0179] By inclining the first groove side surface 2413 and the second groove side surface 2414, and inclining the third groove side surface 2415 and the fourth groove side surface 2416, and a>b or a<b, it is beneficial to reduce stress concentration when the first groove 241 is formed by stamping.

[0180] Please refer to FIG. 5 and FIG. 6, in some embodiments, the pressure relief mechanism 24 is provided with a second groove 242, and the first groove 241 and the second groove 242 are arranged along the thickness direction of the wall portion 213. The second groove 242 has a second groove bottom surface 24221, and the groove opening 2412 of the first groove 241 is formed on the second groove bottom surface 24221.

[0181] The pressure relief mechanism 24 includes a first surface 243, wherein the second groove 242 is arranged on the first surface 243, and the first groove 241 is arranged on the second groove bottom surface 24221 of the second groove 242.

[0182] The groove opening 2412 of the first groove 241 is formed on the first groove bottom surface 2411 of the second groove 242, and during stamping, the second groove 242 can be formed by stamping first, and then the first groove 241 is formed by stamping, thereby reducing the forming force on the pressure relief mechanism 24, reducing the risk of cracks in the pressure relief mechanism 24, and improving the reliability of the battery monomer 20.

[0183] Please refer to FIG. 13, which is a sectional view of the pressure relief mechanism 24 according to some embodiments of the present application. In some embodiments, the pressure relief mechanism 24 has a first surface 243 and a second surface 244 arranged opposite to each other in the thickness direction of the wall portion 213, and the second groove 242 includes a plurality of grooves arranged in sequence from the first surface 243 to the second surface 244. In two adjacent grooves, the groove bottom surface of the groove farther away from the first surface 243 is arranged on the groove bottom surface of the groove closer to the first surface 243. The groove bottom surface of the groove farther away from the first surface 243 in the plurality of grooves is a second groove bottom surface 24221.

[0184] The pressure relief mechanism 24 has a first surface 243 and a second surface 244 arranged opposite to each other in the thickness direction of the wall portion 213, and the second groove 242 includes a plurality of grooves arranged in sequence from the first surface 243 to the second surface 244 in the pressure relief mechanism 24, and the groove bottom surfaces of the plurality of grooves gradually decrease in profile.

[0185] The groove bottom surface of the groove farther away from the first surface 243 in the plurality of grooves is a second groove bottom surface 24221, i.e., the first groove 241 is arranged on the groove bottom surface of the groove farther away from the first surface 243 in the plurality of grooves.

[0186] For example, as shown in FIG. 13, the second groove 242 includes two grooves, i.e., a first groove 2421 and a second groove 2422. In the process of forming, the first groove 2421 can be first punched and formed on the first surface 243, then the second groove 2422 can be punched and formed on the groove bottom surface of the first groove 2421, and finally the first groove 241 can be punched and formed on the groove bottom surface of the second groove 2422.

[0187] The second groove 242 includes a plurality of grooves, and the plurality of grooves can be punched and formed in sequence when the second groove 242 is punched and formed, thereby reducing the forming force on the pressure relief mechanism 24, reducing the risk of cracks in the pressure relief mechanism 24, and improving the reliability of the battery monomer 20. In addition, the first groove 241 is the last step of punching, and there is no other punching step thereafter, which is conducive to maintaining the shape of the first groove 241, keeping the burst pressure of the plurality of battery monomers 20 consistent when the plurality of battery monomers 20 are manufactured, and improving the reliability of the battery monomer 20.

[0188] Please refer to FIG. 3, FIG. 4 and FIG. 5 again. In some embodiments, the pressure relief mechanism 24 is arranged separately from the wall portion 213, the wall portion 213 is provided with a pressure relief hole 2131, and the pressure relief mechanism 24 is installed on the wall portion 213 and covers the pressure relief hole 2131.

[0189] The "pressure relief mechanism 24 is provided separately from the wall portion 213, the wall portion 213 is provided with a pressure relief hole 2131, and the pressure relief mechanism 24 is mounted on the wall portion 213 and covers the pressure relief hole 2131" means that, in manufacturing, the pressure relief hole 2131 is formed on the wall portion 213, the pressure relief mechanism 24 and the wall portion 213 are provided separately, and finally connected together. For example, the pressure relief mechanism 24 can be welded to the wall portion 213. The pressure relief mechanism 24 can be a rupture disc mounted on the wall portion 213.

[0190] In some embodiments, the pressure relief mechanism 24 is arranged at one end of the pressure relief hole 2131 facing the electrode assembly 23. The battery monomer 20 comprises a protective piece 26 arranged at one end of the pressure relief hole 2131 away from the electrode assembly 23 and covering the pressure relief hole 2131.

[0191] By providing the pressure relief mechanism 24 separately from the wall portion 213 and mounting it on the wall portion 213, the manufacturing process is facilitated.

[0192] Optionally, the base material of the wall portion 213 is iron, and the pressure relief mechanism 24 is welded to the wall portion 213.

[0193] The "base material of the wall portion 213 is iron" means that the material with the largest mass percentage in the material of the wall portion 213 is iron. For example, the material of the wall portion 213 can be carbon steel or stainless steel. The carbon steel can be low carbon steel, medium carbon steel or high carbon steel. For example, the material of the wall portion 213 can be 304 stainless steel, 305 stainless steel, 316 stainless steel, etc.

[0194] The base materials of the pressure relief mechanism 24 and the wall portion 213 are both iron, which on the one hand can effectively improve the structural strength of the wall portion 213 and the pressure relief mechanism 24, reduce the risk of deformation of the wall portion 213 and the pressure relief mechanism 24 under stress, is conducive to reducing the risk of early valve relief of the pressure relief mechanism 24, and is conducive to improving the service life and reliability of the battery monomer 20. On the other hand, the pressure relief mechanism 24 and the wall portion 213 are easier to weld, which is conducive to reducing the phenomenon of welding cracks in the pressure relief mechanism 24 and the end cover 212, thereby reducing the risk of liquid leakage of the battery monomer 20 and improving the reliability of the battery monomer 20.

[0195] In other embodiments, the pressure relief mechanism 24 is integrally formed with the wall portion 213.

[0196] Integrally formed means that the wall portion 213 and the pressure relief mechanism 24 are provided as an integral structure. For example, the pressure relief mechanism 24 can be formed on the wall portion 213 by stamping.

[0197] Integrally forming the pressure relief mechanism 24 with the wall portion 213 eliminates the need for additional welding or bonding processes, which is conducive to reducing the risk of liquid leakage of the pressure relief mechanism 24. Moreover, in production, it is easy to make the initiation pressure of the processed plurality of battery monomers 20 more consistent.

[0198] In some embodiments, the material of the pressure relief mechanism 24 is 304 stainless steel, 305 stainless steel or 316 stainless steel.

[0199] 304 stainless steel, 305 stainless steel and 316 stainless steel have the advantages of corrosion resistance, high temperature resistance and good processability. The pressure relief mechanism 24 made of 304 stainless steel, 305 stainless steel or 316 stainless steel has high strength, which can reduce the risk of deformation of the pressure relief mechanism 24 under stress, is conducive to reducing the risk of early valve pressure relief of the pressure relief mechanism 24, is conducive to improving the service life and reliability of the battery monomer 20, and is conducive to improving the consistency of the burst pressure of the plurality of battery monomers 20.

[0200] The embodiments of the present application also provide a battery device 100, which comprises the battery monomer 20 described above.

[0201] The embodiments of the present application also provide a power consumption device, which comprises the battery monomer 20 described above, and the battery monomer 20 is used to provide electric energy for the power consumption device.

[0202] According to some embodiments of the present application, please refer to FIGS. 3-13.

[0203] The embodiments of the present application provide a battery monomer 20, which comprises an outer shell 21 and a pressure relief mechanism 24. The outer shell 21 has a wall portion 213, and the pressure relief mechanism 24 is arranged on the wall portion 213. The base material of the pressure relief mechanism 24 is iron. The pressure relief mechanism 24 is provided with a first groove 241, and the pressure relief mechanism 24 is configured to break along at least part of the first groove 241 when the pressure inside the outer shell 21 reaches a threshold value to release the pressure. The first groove 241 has a first groove bottom surface 2411, which is an arc surface recessed in a direction away from a groove opening 2412 of the first groove 241, and the arc surface is arc-shaped in a cross section of the first groove 241. The cross section is perpendicular to the extension direction of the first groove 241. The base material of the pressure relief mechanism 24 is iron, which can effectively improve the structural strength of the pressure relief mechanism 24, reduce the risk of early valve pressure relief of the pressure relief mechanism 24, and be conducive to improving the service life and reliability of the battery monomer 20. By setting the first groove bottom surface 2411 of the first groove 241 as an arc surface recessed in a direction away from the groove opening 2412 of the first groove 241, it is convenient to flow the material when the first groove 241 is stamped and formed, which is conducive to relieving stress concentration, is conducive to keeping the burst pressure of the plurality of battery monomers 20 consistent when the plurality of battery monomers 20 are manufactured, and is conducive to improving the reliability of the battery monomer 20.

[0204] In some embodiments, the arc surface is a circular arc surface, and the circular arc surface defines the slot opening 2412 of the first groove 241. The circular arc surface defines the slot opening 2412 of the first groove 241, so that the cross section of the first groove 241 is entirely in the shape of a circular arc, facilitating the flow of material when the first groove 241 is formed by stamping, which is conducive to relieving stress concentration, and is conducive to keeping the burst pressure of the plurality of battery monomers 20 consistent when the plurality of battery monomers 20 are manufactured, and is conducive to improving the reliability of the battery monomer 20.

[0205] In other embodiments, the first groove 241 includes a first groove side surface 2413 and a second groove side surface 2414, which are oppositely arranged along the width direction of the first groove 241. The first groove bottom surface 2411 connects the first groove side surface 2413 and the second groove side surface 2414. The first groove side surface 2413 and the second groove side surface 2414 define the slot opening 2412 of the first groove 241. The first groove bottom surface 2411 connects the first groove side surface 2413 and the second groove side surface 2414, the first groove side surface 2413 and the second groove side surface 2414 are planar, and the first groove bottom surface 2411 is an arc surface, which is conducive to keeping the width of the first groove 241 small when the depth of the first groove 241 is large, facilitating the control of the burst pressure of the pressure relief mechanism 24. The first groove side surface 2413 and the second groove side surface 2414 define the slot opening 2412 of the first groove 241, so that the cross-sectional shape of the first groove 241 is relatively simple, which is conducive to reducing the stress between the groove side surface and the first groove bottom surface 2411, relieving stress concentration, and is conducive to keeping the burst pressure of the plurality of battery monomers 20 consistent when the plurality of battery monomers 20 are manufactured, and is conducive to improving the reliability of the battery monomer 20.

[0206] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Various modifications and changes can be made by those skilled in the art based on the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, wherein, The utility model relates to a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products.

2. The battery cell of claim 1, wherein, The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products.

3. The battery cell of claim 1 or 2, wherein, The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products.

4. The battery cell of claim 1 or 2, wherein, The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products.

5. The battery cell of claim 4, wherein, The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products.

6. The battery cell of claim 4 or 5, wherein, The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products.

7. The battery cell of claim 4 or 5, wherein, The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products.

8. The battery cell of claim 4, wherein, The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products.

9. The battery cell of claim 8, wherein, The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products.

10. The battery cell of claim 8 or 9, wherein, The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products.

11. The battery cell of claim 8 or 9, wherein, The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products.

12. The battery cell of claim 8 or 9, wherein, The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products.

13. The battery cell of any one of claims 1-12, wherein, The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The utility model discloses a pressure relief mechanism of a shell, and relates to the technical field of electronic products. The 14. The battery cell of claim 13, wherein, The pressure relief mechanism has a first surface and a second surface arranged oppositely in the thickness direction of the wall portion, the second groove includes a plurality of levels of grooves arranged in sequence from the first surface to the second surface, and in two adjacent levels of the grooves, a level of the groove away from the first surface is arranged on a groove bottom surface of a level of the groove close to the first surface; A groove bottom surface of a level of the grooves farthest away from the first surface is the second groove bottom surface.

15. The battery cell of any one of claims 1-14, wherein, The pressure relief mechanism is arranged separately from the wall portion, the wall portion is provided with a pressure relief hole, and the pressure relief mechanism is mounted on the wall portion and covers the pressure relief hole.

16. The battery cell of claim 15, wherein, The base material of the wall portion is iron, and the pressure relief mechanism is welded to the wall portion.

17. The battery cell of any one of claims 1-14, wherein, The pressure relief mechanism is integrally formed with the wall portion.

18. The battery cell of any one of claims 1-17, wherein, The material of the pressure relief mechanism is 304 stainless steel, 305 stainless steel, or 316 stainless steel.

19. A battery device, wherein, The battery cell according to any one of claims 1-18.

20. An electrical device, comprising: The battery cell according to any one of claims 1-18 is used to provide electric energy for the electric device.

Images