Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell and an electrode assembly, and the electrode assembly is arranged in the shell. Wherein the shell comprises a first pressure relief part and a second pressure relief part, and the second pressure relief part is located between the electrode assembly and the first pressure relief part. The battery monomer has relatively high reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] How to improve the reliability of the battery monomer is a problem to be solved in the battery technology. CONTENT OF THE INVENTION

[0004] In view of the above problems, the present application provides a battery monomer, a battery device and a power utilization device, which can improve the reliability of the battery monomer.

[0005] In a first aspect, the present application provides a battery monomer, which comprises a shell and an electrode assembly, and the electrode assembly is arranged in the shell. The shell comprises a first pressure relief component and a second pressure relief component, and the second pressure relief component is located between the electrode assembly and the first pressure relief component.

[0006] In the technical scheme of the present application, the shell is provided with the first pressure relief component and the second pressure relief component, which is equivalent to providing double protection for the battery monomer. Even if one of the two pressure relief components cannot normally open due to creep, the other pressure relief component can normally work. Moreover, compared with the battery monomer comprising only a single pressure relief component, since the second pressure relief component is located between the electrode assembly and the first pressure relief component, the influence of the external force of the battery monomer on the second pressure relief component is relatively small, and the influence of the internal force of the battery monomer on the first pressure relief component is small. The risk of the pressure relief component creeping and abnormally opening due to the concentration of internal and external forces on one pressure relief component is low, thereby the battery monomer can have high reliability.

[0007] In one or more embodiments of the first aspect, the shell comprises a shell body and a first end cover, the shell body has a first opening, and the first end cover seals the first opening. The first end cover is the first pressure relief component.

[0008] In the above scheme, the first end cover can have a pressure relief function, which simplifies the number of parts of the battery monomer and is conducive to improving the energy density of the battery monomer. At the same time, the process flow before the first end cover seals the first opening in the production process of the battery monomer will not cause damage to the first pressure relief component, and the first pressure relief component can maintain good performance, which is conducive to making the battery monomer comprising the first pressure relief component have high reliability.

[0009] In one or more embodiments of the first aspect, the second pressure relief component is provided with a liquid injection hole. The battery cell further comprises a first sealing member, the first sealing member sealing the liquid injection hole.

[0010] In the above solution, since the second pressure relief component is provided with a liquid injection hole, the second pressure relief component integrates the liquid injection channel of the battery cell while having the ability to relieve pressure. The first sealing member seals the liquid injection hole once, and after the first pressure relief component, i.e., the first end cover, seals the first opening, the liquid injection hole is doubly sealed. That is, the first pressure relief component not only has the ability to relieve pressure, but also seals the liquid injection hole provided on the second pressure relief component. In addition, during the production of the battery cell, the electrolyte overflowed during liquid injection and / or formation will not come into contact with the first pressure relief component, thereby reducing the risk of abnormal opening of the first pressure relief component due to electrolyte corrosion and creep. The reliability of the battery cell is improved.

[0011] In one or more embodiments of the first aspect, the first sealing member comprises a sealing portion, a first limiting portion, and a second limiting portion, at least part of the sealing portion is located in the liquid injection hole, the first limiting portion is provided at one end of the sealing portion and protrudes from the outer peripheral surface of the sealing portion, the second limiting portion is provided at the other end of the sealing portion and protrudes from the outer peripheral surface of the sealing portion, the first limiting portion is located on the side of the second pressure relief component facing the first pressure relief component, and the second limiting portion is located on the side of the second pressure relief component away from the first pressure relief component.

[0012] In the above solution, by providing the first limiting portion and the second limiting portion, the sealing performance of the first sealing member on the liquid injection hole is improved.

[0013] In one or more embodiments of the first aspect, the first pressure relief component is provided with a reinforcing rib, and in the same projection plane perpendicular to the thickness direction of the first pressure relief component, the orthographic projection of the reinforcing rib at least partially overlaps the orthographic projection of the first sealing member.

[0014] In the above solution, the provision of the reinforcing rib can improve the structural stability of the first pressure relief component. Since in the same projection plane perpendicular to the thickness direction of the first pressure relief component, the orthographic projection of the reinforcing rib at least partially overlaps the orthographic projection of the first sealing member, the strength of the region corresponding to the position of the first pressure relief component and the first sealing member is strengthened, thereby reducing the risk of abnormal opening of the first pressure relief component due to creep of the first pressure relief component caused by the first sealing member pressing against the first pressure relief component.

[0015] In one or more embodiments of the first aspect, the battery cell further comprises a suction member, the suction member is provided on the side of the second pressure relief component facing the electrode assembly, and the suction member is configured to be capable of adsorbing electrolyte.

[0016] In the scheme, the suction member can adsorb the electrolyte overflowed in the cell monomer formation process, thereby reducing the risk of electrolyte corroding the second pressure relief component.

[0017] In one or more embodiments of the first aspect, the second pressure relief component comprises a second score groove, and a front projection of the suction member does not overlap with a front projection of the second score groove in the same projection plane perpendicular to the thickness direction of the first pressure relief component.

[0018] In the scheme, when the cell monomer is relieved, the suction member has a lower risk of blocking the movement of the discharge, and the cell monomer can be relieved more smoothly.

[0019] In one or more embodiments of the first aspect, the second pressure relief component has a first surface facing the electrode assembly, and the suction member is arranged on the first surface.

[0020] In the scheme, the second pressure relief component can be assembled into the cell monomer together with the suction member, thereby reducing the assembly difficulty of the suction member.

[0021] In one or more embodiments of the first aspect, the electrode assembly has a winding center hole, and the liquid injection hole is located corresponding to the winding center hole.

[0022] In the scheme, since the liquid injection hole is located corresponding to the winding center hole, the electrolyte injected into the cell monomer is more evenly distributed during the liquid injection process of the cell monomer, and the electrode assembly has better wettability.

[0023] In one or more embodiments of the first aspect, the shell further comprises a cover, the shell further has a second opening, the cover seals the second opening, and the cover is the second pressure relief component.

[0024] In the scheme, the second opening can serve as a pressure relief channel when the cell monomer is relieved, so that the second pressure relief component can be opened in time. Meanwhile, by arranging the cover sealing the second opening as the second pressure relief component, the processing difficulty of the second pressure relief component can be reduced.

[0025] In one or more embodiments of the first aspect, the shell comprises a side wall and a flange portion, the side wall surrounds the electrode assembly, one end of the side wall is closed to form the first opening, the flange portion protrudes from the inner circumferential surface of the side wall and surrounds the second opening, and the cover is connected to the flange portion and covers the second opening.

[0026] In the scheme, the flange portion can serve as an assembly base of the cover when surrounding the second opening, thereby reducing the assembly difficulty of the cover, i.e., the second pressure relief component.

[0027] In one or more embodiments of the first aspect, the battery cell further comprises a first current collector, the electrode assembly comprises the main body and the first tab, the first tab is arranged at one end of the main body close to the second pressure relief component, the first tab is connected to the first current collector, and the first current collector is connected to the flange part.

[0028] In the above solution, since the first tab is connected to the first current collector, and the first current collector is connected to the flange part, the shell serves as an output pole of the battery cell. Compared with a battery cell that draws out the electrical energy of the electrode assembly through an electrode terminal, the space occupied by the electrode terminal is saved, and the energy density of the battery cell is improved.

[0029] In one or more embodiments of the first aspect, the first current collector is welded to the flange part to form a first welding mark, the second pressure relief component is welded to the flange part to form a second welding mark, and the first welding mark and the second welding mark do not overlap in the thickness direction of the first pressure relief component.

[0030] In the above solution, since the two welding marks do not overlap, the welding difficulty between the first current collector, the second pressure relief component, and the flange part is reduced. At the same time, the connection stability between the three is improved.

[0031] In one or more embodiments of the first aspect, the battery cell further comprises a first electrode terminal and a second current collector. The electrode assembly further comprises a second tab, the second tab is opposite in polarity to the first tab, and the second tab is arranged at one end of the main body away from the second pressure relief component. The shell comprises a side wall and a bottom wall, the side wall surrounds the bottom wall, and one end of the side wall away from the bottom wall surrounds a first opening. The first electrode terminal is arranged on the bottom wall, the second tab is connected to the second current collector, and the second current collector is connected to the first electrode terminal.

[0032] In the above solution, the side wall and the bottom wall form the shell with the first opening, and the structural stability is high.

[0033] In one or more embodiments of the first aspect, the battery cell further comprises a first electrode terminal and a second current collector. The electrode assembly further comprises a second tab, the second tab is opposite in polarity to the first tab, and the second tab is arranged at one end of the main body away from the second pressure relief component. The shell comprises a side wall and a bottom wall, the side wall surrounds the bottom wall, and one end of the side wall away from the bottom wall surrounds a first opening. The first electrode terminal is arranged on the bottom wall, the second tab is connected to the second current collector, and the second current collector is connected to the first electrode terminal.

[0034] In the scheme, the first opening and the third opening are formed at opposite ends of the shell, the electrode assembly can enter the shell from the first opening or the third opening, the risk of the electrode assembly interfering with the shell to cause the size of the electrode assembly to be limited is low, and the battery monomer has a high energy density. Meanwhile, the first electrode terminal can be assembled with the second end cover in advance, and then the third opening is closed to complete the assembly of the battery monomer, and the assembly difficulty of the first electrode terminal is low.

[0035] In one or more embodiments of the first aspect, the first tab is a negative tab, and the second tab is a positive tab.

[0036] In the scheme, the shell of the battery monomer serves as a negative electrode of the battery monomer, which can reduce the possibility of external impurities and moisture contacting the shell, thereby improving the sealing performance of the battery monomer.

[0037] In one or more embodiments of the first aspect, the electrode assembly has a wound structure, and the second pressure relief component is located between the electrode assembly and the first pressure relief component along the winding axis direction of the electrode assembly.

[0038] In the scheme, the first pressure relief component and the second pressure relief component are arranged along the winding axis direction of the electrode assembly, which can reduce the risk of the electrode assembly deforming excessively and abnormally opening the first pressure relief component and the second pressure relief component, and can also improve the pressure relief efficiency of the battery monomer.

[0039] In one or more embodiments of the first aspect, the first pressure relief component and the second pressure relief component are arranged along the winding axis direction of the electrode assembly.

[0040] In the scheme, the first pressure relief component and the second pressure relief component are arranged along the winding axis direction of the electrode assembly, which can reduce the risk of the electrode assembly deforming excessively and abnormally opening the first pressure relief component and the second pressure relief component, and can also improve the pressure relief efficiency of the battery monomer.

[0041] In one or more embodiments of the first aspect, the first pressure relief component has a second surface facing the second pressure relief component, and the second surface is provided with a corrosion-resistant layer.

[0042] In the scheme, the corrosion-resistant layer can reduce the risk of the first pressure relief component being corroded.

[0043] In one or more embodiments of the first aspect, the material of the shell is steel.

[0044] In the scheme, the steel shell has high structural strength and strong resistance to external force impact, and can make the battery monomer have better structural stability.

[0045] In one or more embodiments of the first aspect, the first pressure relief component includes a first notch groove.

[0046] In the above solution, the first pressure relief component has a weak part by setting the first score groove, so that the first pressure relief component can open along the first score groove as an edge when the battery cell is in thermal runaway. Such a first pressure relief component does not occupy additional space of the battery cell, so that the battery cell has a higher equivalent density. At the same time, the processing difficulty is relatively low, and the cost is low.

[0047] In one or more embodiments of the first aspect, the first pressure relief component and the second pressure relief component are made of manganese steel.

[0048] In the above solution, the first pressure relief component and the second pressure relief component are made of manganese steel, which can reduce the risk of corrosion of the pressure relief component, and also make the pressure relief component have better overheating sensitivity, so that the pressure relief component can be opened in time.

[0049] In one or more embodiments of the first aspect, the battery cell is a cylindrical battery cell.

[0050] In a second aspect, the present application provides a battery device comprising the battery cell in one or more embodiments described above.

[0051] In the above solution, since the one or more battery cells described above have high reliability, the battery device comprising the battery cell in one or more embodiments described above also has high reliability.

[0052] In one or more embodiments of the second aspect, the first pressure relief component and the second pressure relief component are both located below the electrode assembly along the direction of gravity.

[0053] In the above solution, since the first pressure relief component and the second pressure relief component are both located below the electrode assembly along the direction of gravity, when the battery cell is in thermal runaway, the discharge is more likely to be discharged to the outside of the battery cell in time under the guidance of gravity, and is more likely to be guided to the outside of the battery device, which is beneficial to reduce the risk of damage to other components in the battery device by the discharge, so that the battery device has high reliability. At the same time, taking the battery device used in a vehicle as an example, downward pressure relief can reduce the risk of damage to passengers by the discharge.

[0054] In a third aspect, the present application provides a power consuming device, which comprises the battery cell in one or more embodiments described above or the battery device in one or more embodiments described above, and the battery cell or the battery device is used to provide electric energy.

[0055] In the above solution, since the one or more battery cells or the battery device described above have high reliability, the power consuming device comprising the battery cell or the battery device in one or more embodiments described above also has high reliability.

[0056] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the specification, and in order to make other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0057] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not to be considered as limiting of the present application. Moreover, in the drawings, like reference numerals denote similar parts throughout the several views. In the drawings:

[0058] Figure 1 Structure diagram of a vehicle for some embodiments of the present application;

[0059] Figure 2 Exploded view of a battery device for some embodiments of the present application;

[0060] Figure 3 Axonometric view of a battery cell for some embodiments of the present application;

[0061] Figure 4 Sectional view of a battery cell for some embodiments of the present application;

[0062] Figure 5 Sectional view of a housing for some embodiments of the present application;

[0063] Figure 6 Sectional view of a portion of a battery cell for some embodiments of the present application; Figure 4

[0064] Figure 7 Sectional view of a portion of a battery cell for some embodiments of the present application;

[0065] Figure 8 Figure 7

[0066] Figure 9 Figure 4

[0067] Figure 10 Figure 4

[0068] Figure 11 Sectional view of a battery cell for some other embodiments of the present application;

[0069] Figure 12 Figure 11

[0070] ​​​​​​​​​The reference signs in the detailed description of the embodiments are listed below:

[0071] 1000 - vehicle; 200 - controller; 300 - motor; 100 - battery device; 11 - box body; 111 - first box body; 112 - second box body; 12 - battery cell; 121 - shell; 1212 - housing; 12121 - side wall; 12122 - flange portion; 12123 - bottom wall; 122 - electrode assembly; 1221 - winding center hole; 1222 - main body; 1223 - first tab; 1224 - second tab; 126 - first pressure relief component; 1261 - second surface; 1262 - first score groove; 127 - second pressure relief component; 1271 - liquid injection hole; 1272 - second score groove; 1273 - first surface; 28 - first end cover; 129 - first opening; 130 - first sealing member; 1301 - sealing portion; 1302 - first limiting portion; 1303 - second limiting portion; 131 - suction member; 132 - second opening; 133 - cover body; 134 - first welding mark; 135 - second welding mark; 136 - first current collector; 137 - first electrode terminal; 138 - second current collector; 139 - third opening; 140 - second end cover; 141 - reinforcing rib. DETAILED DESCRIPTION

[0072] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0073] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0074] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0075] Reference to“an embodiment” herein 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 an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a common alternative embodiment. One of ordinary skill in the art will readily recognize from the disclosure herein a wide variety of ways that the embodiments described can be combined, sub-combined, substituted, modified and / or altered in various ways.

[0076] In the description of embodiments of the present application, the term“a plurality of” refers to two or more (including two), and similarly, the term“a plurality of groups” refers to two or more groups (including two groups), and the term“a plurality of pieces” refers to two or more pieces (including two pieces).

[0077] In embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be used continuously after being discharged by means of charging to activate the active material.

[0078] The battery cell includes, but is not limited to, a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc.

[0079] 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 (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can reduce the risk of short circuiting between the positive electrode and the negative electrode, and at the same time, allow the active ions to pass through.

[0080] In some embodiments, the positive electrode can be a positive electrode tab, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0081] By way of example, the positive electrode current collector has two opposite surfaces in the thickness direction of itself, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0082] By way of example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a high polymer 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, etc.) on a high polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0083] As an example, the positive electrode 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 battery positive electrode active material can also be used. These positive electrode active materials can be used alone only one or two or more 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 LiFePO4 (which can also be referred to as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite of lithium manganese phosphate and carbon, lithium manganese iron phosphate, a composite of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, at least one of lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (which can also be referred to as NCM333), LiNi0.5Co0.2Mn0.3O2 (which can also be referred to as NCM523), LiNi0.5Co0.25Mn0.25O2 (which can also be referred to as NCM211), LiNi0.6Co0.2Mn0.2O2 (which can also be referred to as NCM622), LiNi0.8Co0.1Mn0.1O2 (which can also be referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi0.85Co0.15Al0.05O2), and modified compounds thereof.

[0084] In some embodiments, the positive electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. When the foamed metal is used as the positive electrode, the foamed metal surface can not be provided with a positive electrode active material, or of course can be provided with a positive electrode active material. As an example, the foamed metal can also be filled or / and deposited with a lithium source material, potassium metal, or sodium metal, the lithium source material being lithium metal and / or a lithium-rich material.

[0085] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0086] As an example, the negative current collector can employ a metal foil, a foamed metal, or a composite current collector. For example, as the metal foil, aluminum with a silver plating surface treatment, stainless steel with a silver plating surface treatment, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be employed. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed 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.).

[0087] As an example, the negative electrode tab can include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0088] As an example, the negative current collector has two surfaces opposite in a thickness direction thereof, and the negative active material is disposed on any one or both of the two opposite surfaces of the negative current collector.

[0089] 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, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery negative active material can also be used. These negative active materials can be used alone or in combination of two or more.

[0090] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0091] 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.

[0092] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive electrode and the negative electrode.

[0093] In some embodiments, the battery cell further includes an electrolyte, which functions to conduct ions between the positive electrode and the negative electrode. 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.

[0094] 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 difluoro-oxalato-borate, lithium bis-oxalato-borate, lithium difluoro-bis-oxalato-phosphate, and lithium tetrafluoro-oxalato-phosphate.

[0095] 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.

[0096] In some embodiments, the gel-state electrolyte includes a polymer as a backbone network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0097] In some embodiments, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, a composite solid-state electrolyte.

[0098] As an example, the polymer solid-state electrolyte can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, cellulose, or the like.

[0099] As an example, the inorganic solid-state electrolyte can include one or more of oxide solid electrolytes (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superionic conductor (lithium germanium phosphorous sulfide, argyrodite), amorphous sulfide), and halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0100] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0101] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0102] In some embodiments, the electrode assembly is in a stack structure.

[0103] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0104] As an example, the positive electrode tab can be provided in plurality, and the negative electrode tab can be folded to form a plurality of folded segments stacked in layers, and one positive electrode tab can be interposed between adjacent folded segments.

[0105] As an example, the positive electrode tab and the negative electrode tab can each be folded to form a plurality of folded segments stacked in layers.

[0106] As an example, the separator can be provided in plurality, and can be provided between any adjacent positive electrode tab or negative electrode tab, respectively.

[0107] As an example, the separator can be provided in succession, and can be provided between any adjacent positive electrode tab or negative electrode tab by folding or winding.

[0108] In some embodiments, the electrode assembly can have a shape of a cylinder, a flat, a polygonal prism, or the like.

[0109] In some embodiments, the electrode assembly can be provided with a tab, and the tab can guide current out of the electrode assembly. The tab can include a positive electrode tab and a negative electrode tab.

[0110] In some embodiments, the battery cell can include a case. The case can be used to enclose components such as the electrode assembly and the electrolyte. The case 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, or the like.

[0111] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell having another shape, and the prismatic battery cell can include a square battery cell, a blade battery cell, a polygonal prism battery cell (e.g., a hexagonal prism battery cell), or the like.

[0112] The battery referred to in the embodiments of the present application can refer to a single physical module including one or more battery cells to provide a higher voltage and capacity.

[0113] The battery apparatus referred to in the embodiments of the present application can include one or more battery cell assemblies to provide a voltage and a 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 component.

[0114] In some embodiments, a 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, which is formed by arranging and fixing a plurality of battery cells into one independent module. As an example, the battery module can be formed by bundling a plurality of battery cells by a cable tie.

[0115] In some embodiments, the battery device can be a battery pack, which includes a box and one or more battery cell assemblies, the battery cell assemblies are accommodated in the box.

[0116] As an example, the battery cell assembly can be a battery module, which can be accommodated in the box by fixing the battery module in the box.

[0117] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0118] In some embodiments, the box can be part of the chassis structure of the vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0119] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0120] The development of battery technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate, and other performance parameters. In addition, the reliability of the battery device also needs to be considered.

[0121] Generally, a battery cell is usually provided with a pressure relief component, which is generally arranged in the shell and used to release the pressure inside the battery cell when the internal pressure or temperature of the battery cell reaches a predetermined value. When the pressure relief component of the battery cell is subjected to external force or stress generated inside the battery cell, the pressure relief component will be repeatedly impacted by pressure, and then the risk of abnormal opening of the pressure relief component due to creep will be high, that is, the risk of not opening in time or opening in advance when the internal pressure or temperature of the battery cell reaches a predetermined value will be high. The reliability of the battery cell is poor.

[0122] In view of this, the battery cell provided in the present application comprises a shell and an electrode assembly, the electrode assembly is arranged in the shell. The shell comprises a first pressure relief component and a second pressure relief component, and the second pressure relief component is located between the electrode assembly and the first pressure relief component. The shell sets the first pressure relief component and the second pressure relief component, which is equivalent to providing double protection for the battery cell. Even if one of the two pressure relief components cannot normally open due to creep, the other pressure relief component can normally work. Moreover, compared with the battery cell comprising only a single pressure relief component, since the second pressure relief component is located between the electrode assembly and the first pressure relief component, the influence of the force outside the battery cell on the second pressure relief component is relatively small, the influence of the force inside the battery cell on the first pressure relief component is small, and the risk of the pressure relief component creeping and abnormally opening due to the concentration of internal and external forces on one pressure relief component is low, thereby the battery cell can have higher reliability.

[0123] The technical solutions described in the embodiments of the present application are applicable to battery cells, battery devices and electric devices using the battery devices.

[0124] The electric device includes but is not limited to: electric vehicles, electric vehicles, ships and spacecraft, etc., for example, spacecraft includes airplanes, rockets, space shuttles and spacecraft, etc.

[0125] The following embodiments are described for convenience with a vehicle 1000 as an example of an electric device of an embodiment of the present application.

[0126] For example, Figure 1 The vehicle 1000 of some embodiments of the present application is a structural schematic diagram. The vehicle 1000 can be a fuel car, a gas car or a new energy car. The new energy car can be a pure electric car, a hybrid car or a range extended car, etc. The vehicle 1000 can be provided with a motor 300, a controller 200 and a battery device 100. The controller 200 is used to control the power supply of the battery device 100 to the motor 300. For example, the battery device 100 can be arranged at the bottom, the front or the 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 source of the vehicle 1000, which is used for the circuit system of the vehicle 1000, for example, for the working power demand of the vehicle 1000 during starting, navigation and running. In another embodiment of the present application, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0127] To meet different power demands, the battery device 100 can include a plurality of battery cells 12, which can be connected in series, in parallel, or in a hybrid manner. The battery device 100 can also be referred to as a battery pack. Alternatively, the plurality of battery cells 12 can be connected in series, in parallel, or in a hybrid manner to form a battery cell assembly, and the plurality of battery cell assemblies can be connected in series, in parallel, or in a hybrid manner to form the battery device 100. That is, the plurality of battery cells 12 can be directly connected to form the battery device 100, or the plurality of battery cells 12 can be connected to form a battery cell assembly, and the battery cell assembly can be connected to form the battery device 100.

[0128] For example, referring to Figure 2 FIG. 2 is an exploded view of the battery device 100 according to some embodiments of the present application, which can include a plurality of battery cells 12. The battery device 100 can also include a box 11, which has a hollow structure inside, and the plurality of battery cells 12 can be accommodated in the box 11. As shown, the first box 111 and the second box 112 are coupled together. The shapes of the first box 111 and the second box 112 can be determined according to the shape of the plurality of battery cells 12 combined, and the first box 111 and the second box 112 can each have an open face. For example, the first box 111 and the second box 112 can each be a hollow cuboid and have only one face as an open face. The open face of the first box 111 and the open face of the second box 112 are arranged opposite to each other, and the first box 111 and the second box 112 are coupled to each other to form the box 11 having a closed cavity. The plurality of battery cells 12 combined in parallel, in series, or in a hybrid manner are placed in the box 11 formed by the coupling of the first box 111 and the second box 112.

[0129] Alternatively, the battery device 100 can also include other structures, which will not be described one by one. For example, the battery device 100 can also include a current collection component for realizing the electrical connection between the plurality of battery cells 12, such as parallel connection, series connection, or hybrid connection. Specifically, the current collection component can realize the electrical connection between the plurality of battery cells 12 by connecting the electrode terminals of the battery cells 12. Further, the current collection component can be fixed to the electrode terminals of the battery cells 12 by welding. The electrical energy of the plurality of battery cells 12 can be further led out through the box 11 by a conductive mechanism.

[0130] The number of battery cells 12 can be set to any value according to different power requirements. The plurality of battery cells 12 can be connected in series, in parallel, or in a mixed manner to achieve a larger capacity or power. Since the number of battery cells 12 included in each battery device 100 can be large, in order to facilitate installation, the battery cells 12 can be arranged in groups, and each group of battery cells 12 forms a battery cell assembly. The number of battery cells 12 included in the battery cell assembly is not limited and can be set according to requirements. The battery device 100 can include a plurality of battery cell assemblies, and these battery cell assemblies can be connected in series, in parallel, or in a mixed manner.

[0131] According to some embodiments of the present application, please refer to Figures 3-5 and Figure 11 and Figure 12 The battery cell 12 includes a housing 121 and an electrode assembly 122, and the electrode assembly 122 is arranged in the housing 121. The housing 121 includes a first pressure relief component 126 and a second pressure relief component 127, and the second pressure relief component 127 is located between the electrode assembly 122 and the first pressure relief component 126.

[0132] The pressure relief component refers to an element or component that is actuated to release the internal pressure or temperature of the battery cell 12 when the internal pressure or temperature or other conditions of the battery cell 12 reaches a predetermined threshold. The threshold is designed differently according to different design requirements. The threshold can depend on the material of one or several of the positive electrode sheet, the negative electrode sheet, the electrolyte, and the separator film in the battery cell 12. The pressure relief component can take the form of a pressure relief valve, a gas valve, a pressure relief valve, or a safety valve, and can specifically take the form of a pressure-sensitive or temperature-sensitive element or structure, i.e., when the internal pressure or temperature or other conditions of the battery cell 12 reaches a predetermined threshold, the pressure relief component performs an action or a weak structure provided in the pressure relief component is broken, thereby forming an opening or passage for the internal pressure or temperature to be released. The melting point and / or thickness of the general weak structure is lower than that of other regions of the pressure relief component. For example, the weak structure can be a notch groove provided on the surface of the pressure relief component, etc.

[0133] The action of opening the pressure relief component can include but is not limited to at least one of the following: breaking, shattering, tearing, or opening, etc. The opening of the pressure relief component can also be referred to as the actuation of the pressure relief component. When the pressure relief component is actuated, the high-temperature and high-pressure substances inside the battery cell 12 will be discharged outward from the actuated part as the discharge. In this way, the battery cell 12 can be relieved of pressure and temperature in a controllable manner, thereby reducing the possibility of a more serious accident.

[0134] The discharge from the battery cell 12 mentioned in the present application includes but is not limited to: electrolyte, dissolved or split positive and negative electrode sheets, fragments of the separator film, high-temperature and high-pressure gas generated by the reaction, flame, etc.

[0135] The opening of the pressure relief component refers to the need to release the internal pressure or temperature when the internal pressure of the battery monomer 12 reaches the preset pressure or temperature or other predetermined threshold. The shape of the pressure relief component can include but is not limited to a circle, an ellipse, a polygon, a waist shape, etc. The shape of the pressure relief component can be a symmetrical shape or an asymmetrical shape. The pressure relief component can be a pressure relief notch, which can refer to a part of the pressure relief component with a thickness and / or a melting point lower than that of other areas of the pressure relief component except the pressure relief notch, for example, a notch groove or a pressure relief groove, that is, a groove is opened on the surface of the pressure relief component, which is equivalent to reducing the thickness of the pressure relief component at the position of the pressure relief notch. The pressure relief notch can be formed by machining, etching, stamping, etc. The shape of the pressure relief notch can be arc-shaped, polyline-shaped, etc. The pressure relief notch can include multiple notches, for example, at least one arc segment and at least one straight line segment.

[0136] In some embodiments, the electrode assembly 122 is a wound structure.

[0137] In some embodiments, the electrode assembly 122 is a stacked structure.

[0138] In some embodiments, the shell 121 is a cylinder.

[0139] In some embodiments, the shell 121 is a prism, for example, a square shell, a multi-prism, a blade.

[0140] The first pressure relief component 126 can be any wall of the shell 121. For example, in some embodiments, the shell 121 includes a shell 1212 and a first end cover 28, the shell 1212 has a first opening 129, the first end cover 28 closes the first opening 129, the shell 1212 includes a side wall 12121 and a bottom wall 12123, the side wall 12121 surrounds the bottom wall 12123, and the end of the side wall 12121 away from the bottom wall 12123 surrounds the first opening 129. The first pressure relief component 126 can be the first end cover 28, the first pressure relief component 126 can also be the side wall 12121, and the first pressure relief component 126 can also be the bottom wall 12123. For example, in other embodiments, the opposite ends of the shell 1212 form the first opening 129 and the third opening 139, the shell 121 includes the first end cover 28 and the second end cover 140, the first end cover 28 closes the first opening 129, and the second end cover 140 closes the third opening 139. The first pressure relief component 126 can be the first end cover 28, the first pressure relief component 126 can also be the second end cover 140, and the first pressure relief component 126 can also be the shell 1212.

[0141] The first pressure relief component 126 and the second pressure relief component 127 can be components arranged on the shell 121, and of course can also be the wall itself of the shell 121.

[0142] In some embodiments, the second pressure relief component 127 is located within the housing 121.

[0143] In some embodiments, the housing 121 comprises a shell 1212 and a first end cover 28 and a second end cover 140, the shell 1212 has opposite first and third openings 129 and 139, the shell 1212 comprises a side wall 12121 surrounding the electrode assembly 122 and a partition wall, two ends of the side wall 12121 form the first and third openings 129 and 139 respectively, the first end cover 28 closes the first opening 129, the second end cover 140 closes the third opening 139, the partition wall is located between the first end cover 28 and the second end cover 140 along the thickness direction of the first end cover 28, the partition wall is connected to the side wall 12121, and the second pressure relief component 127 is the partition wall.

[0144] In some embodiments, the housing 121 comprises a shell 1212 and a first end cover 28, the shell 1212 has a first opening 129, and the first end cover 28 closes the first opening 129, the shell 1212 comprises a side wall 12121, a bottom wall 12123, and a partition wall, the side wall 12121 surrounds the bottom wall 12123, and an end of the side wall 12121 away from the bottom wall 12123 surrounds the first opening 129. The partition wall is located between the first end cover 28 and the bottom wall 12123 along the thickness direction of the first end cover 28, the partition wall is connected to the side wall 12121, and the second pressure relief component 127 is the partition wall.

[0145] In some embodiments, the battery cell 12 further comprises a first electrode terminal and a second electrode terminal, the first electrode terminal and the second electrode terminal are opposite in polarity, and the first electrode terminal and the second electrode terminal can be arranged on the same wall of the housing 121 or on different walls of the housing 121, for example, the first electrode terminal and the second electrode terminal are arranged on opposite two walls of the housing 121 respectively. When the first pressure relief component 126 is a wall of the housing 121, the first electrode terminal can be arranged on the first pressure relief component 126.

[0146] When the second pressure relief component 127 is located between the electrode assembly 122 and the first pressure relief component 126, the second pressure relief component 127 can be in contact with the first pressure relief component 126, of course, the second pressure relief component 127 can also be arranged apart from the first pressure relief component 126.

[0147] In some embodiments, the first pressure relief component 126 is provided with a liquid injection hole 1271, and the second pressure relief component 127 is provided with a through hole in communication with the liquid injection hole 1271.

[0148] In the technical solution of the embodiment of the application, the shell 121 is provided with the first pressure relief component 126 and the second pressure relief component 127, which is equivalent to providing double protection for the battery monomer 12. Even if one of the two pressure relief components cannot normally open due to creep, the other pressure relief component can normally work. Moreover, compared with the battery monomer 12 including only a single pressure relief component, since the second pressure relief component 127 is located between the electrode assembly 122 and the first pressure relief component 126, the influence of the force outside the battery monomer 12 on the second pressure relief component 127 is relatively small, and the influence of the force inside the battery monomer 12 on the first pressure relief component 126 is small. The risk of causing the pressure relief component to creep and abnormally open due to the concentration of internal and external forces on one pressure relief component is low, thereby enabling the battery monomer 12 to have high reliability.

[0149] According to some embodiments of the application, please refer to Figures 3-5 The shell 121 includes the shell body 1212 and the first end cover 28. The shell body 1212 has the first opening 129, and the first end cover 28 seals the first opening 129. The first end cover 28 is the first pressure relief component 126.

[0150] In some embodiments, the first pressure relief component 126 includes a body and a first score groove 1262. The body seals the first opening 129, and the first score groove 1262 is a groove provided on the body.

[0151] The first end cover 28 seals the first opening 129, meaning that the first end cover 28 exists in the period when the shell body 1212 is separated during the production of the battery monomer 12. The first end cover 28, that is, the first pressure relief component 126, will not be damaged in the processing procedures before the first end cover 28 is connected with the shell body 1212. For example, the assembly stress causes the deformation of the shell 121.

[0152] In the above scheme, the first end cover 28 can have a pressure relief function, which simplifies the number of parts of the battery monomer 12 and is conducive to improving the energy density of the battery monomer 12. Moreover, the process flow before the first end cover 28 seals the first opening 129 during the production of the battery monomer 12 will not cause damage to the first pressure relief component 126, and the first pressure relief component 126 can maintain good performance, which is conducive to enabling the battery monomer 12 including the first pressure relief component 126 to have high reliability.

[0153] According to some embodiments of the application, please refer to Figures 3-5 The second pressure relief component 127 is provided with the liquid injection hole 1271. The battery monomer 12 further includes the first sealing member 130, and the first sealing member 130 seals the liquid injection hole 1271.

[0154] In some embodiments, the liquid injection hole 1271 is located at the geometric center of the second pressure relief component 127. Such a configuration is conducive to improving the wettability of the electrode assembly 122.

[0155] The material of the first sealing member 130 can include, but is not limited to, rubber, etc.

[0156] The cross-sectional shape of the first sealing member 130 can be an I-shaped cross-section, a T-shaped cross-section, etc.

[0157] In some embodiments, at least part of the first sealing member 130 is in interference fit with the liquid injection hole 1271.

[0158] During the production process of the battery cell 12, multiple liquid injection and formation processes are generally experienced, and the welding end cover is not connected to the shell 1212 until the battery cell 12 is formed. During the home page and formation processes, the liquid injection hole 1271 needs to be kept open to allow electrolyte to flow into the battery cell 12 or gas to flow out of the battery cell 12. At this time, since the liquid injection hole 1271 is arranged on the second pressure relief member 127, the first pressure relief member 126 has not yet been connected to the shell 1212 as a whole, and even if electrolyte overflow occurs during processing, the first pressure relief member 126 will not be damaged and will still maintain high reliability.

[0159] In the above scheme, since the second pressure relief member 127 is provided with the liquid injection hole 1271, the second pressure relief member 127 not only has the ability to relieve pressure but also integrates the liquid injection channel of the battery cell 12. The first sealing member 130 seals the liquid injection hole 1271 once, and after the first pressure relief member 126, i.e., the first end cover 28, seals the first opening 129, the liquid injection hole 1271 is double-sealed. That is, the first pressure relief member 126 not only has the ability to relieve pressure but also seals the liquid injection hole 1271 arranged on the second pressure relief member 127. In addition, during the production process of the battery cell 12, electrolyte overflow during liquid injection and / or formation will not come into contact with the first pressure relief member 126, thereby reducing the risk of abnormal opening of the first pressure relief member 126 due to electrolyte corrosion and creep. The reliability of the battery cell 12 is improved.

[0160] According to some embodiments of the present application, please refer to Figures 3-6 The first sealing member 130 includes a sealing portion 1301, a first limiting portion 1302, and a second limiting portion 1303. At least part of the sealing portion 1301 is located in the liquid injection hole 1271. The first limiting portion 1302 is arranged at one end of the sealing portion 1301 and protrudes from the outer peripheral surface of the sealing portion 1301. The second limiting portion 1303 is arranged at the other end of the sealing portion 1301 and protrudes from the outer peripheral surface of the sealing portion 1301. The first limiting portion 1302 is located on the side of the second pressure relief member 127 facing the first pressure relief member 126, and the second limiting portion 1303 is located on the side of the second pressure relief member 127 facing away from the first pressure relief member 126.

[0161] In some embodiments, the sealing portion 1301 is in interference fit with the liquid injection hole 1271.

[0162] In some embodiments, the sealing portion 1301 only serves to connect the first limiting portion 1302 and the second limiting portion 1303, and the first limiting portion 1302 and the second limiting portion 1303 are clamped to the second pressure relief component 127 to seal the liquid injection hole 1271.

[0163] In the above scheme, by arranging the first limiting portion 1302 and the second limiting portion 1303, the sealing performance of the first sealing member 130 on the liquid injection hole 1271 is improved.

[0164] According to some embodiments of the present application, please refer to Figures 3-6 The first pressure relief component 126 is provided with a reinforcing rib 141, and the orthographic projection of the reinforcing rib 141 at least partially overlaps the orthographic projection of the first sealing member 130 in the same projection plane perpendicular to the thickness direction of the first pressure relief component 126.

[0165] In some embodiments, the reinforcing rib 141 can include multiple segments, for example, the reinforcing rib 141 can include at least one arc segment, and the reinforcing rib 141 can also include at least one straight line segment. The reinforcing rib 141 can also include at least one arc segment and at least one straight line segment. The reinforcing rib 141 can be H-shaped, Y-shaped, or X-shaped. The multiple segments of the reinforcing rib 141 can be arranged at intervals or can converge at one point.

[0166] In some embodiments, the first sealing member 130 protrudes from the surface of the second pressure relief component 127 facing the first pressure relief component 126. If the second pressure relief component 127 is deformed, the risk of the first sealing member 130 pressing against the first pressure relief component 126 is higher, and the arrangement of the reinforcing rib 141 can reduce the risk of the first pressure relief component 126 being deformed due to the first sealing member 130 moving towards the first pressure relief component 126 and pressing against the first pressure relief component 126.

[0167] In the above scheme, the arrangement of the reinforcing rib 141 can improve the structural stability of the first pressure relief component 126. Since the orthographic projection of the reinforcing rib 141 at least partially overlaps the orthographic projection of the first sealing member 130 in the same projection plane perpendicular to the thickness direction of the first pressure relief component 126, the strength of the area corresponding to the position of the first pressure relief component 126 and the first sealing member 130 can be strengthened, thereby reducing the risk of the first sealing member 130 pressing against the first pressure relief component 126 causing the first pressure relief component 126 to abnormally open due to the creep of the first pressure relief component 126.

[0168] According to some embodiments of the present application, please refer to Figures 3-8The battery cell 12 further comprises a suction member 131 arranged on a side of the second pressure relief component 127 facing the electrode assembly 122, and the suction member 131 is configured to be capable of adsorbing electrolyte.

[0169] During formation of the battery cell 12, electrolyte may overflow with gas, and the arrangement of the suction member 131 can reduce the risk of electrolyte corroding the second pressure relief component 127.

[0170] The material of the suction member 131 can include, but is not limited to, porous ceramic, high polymer (e.g., polyvinyl alcohol, polyacrylamide), sponge, non-woven fabric, fibrous material, etc.

[0171] In some embodiments, the second pressure relief component 127 comprises a second score groove 1272, the suction member 131 covers the second score groove 1272, the second pressure relief component 127 has an opening area, the second score groove 1272 is arranged along the edge of the opening area, the opening area is configured to be capable of being opened with the score groove as the boundary, the suction member 131 is connected to the opening area of the second pressure relief component 127, and the suction member 131 can move with the opening area and does not block the opening area, so that the pressure relief component can be relieved. Such an arrangement can further reduce the risk of corrosion of the second pressure relief component 127.

[0172] In the above scheme, the arrangement of the suction member 131 can adsorb the electrolyte overflowing during formation of the battery cell 12, thereby reducing the risk of electrolyte corroding the second pressure relief component 127.

[0173] According to some embodiments of the present application, please refer to Figures 3-8 The second pressure relief component 127 comprises a second score groove 1272, and in the same projection plane perpendicular to the thickness direction of the first pressure relief component 126, the orthographic projection of the suction member 131 does not overlap the orthographic projection of the second score groove 1272.

[0174] In some embodiments, the suction member 131 is arranged in the above opening area, and since gas will be discharged outside the opening area, gas tends to flow towards the opening area. If electrolyte overflows during formation, the suction member 131 can adsorb most of the overflowing electrolyte.

[0175] In the above scheme, when the battery cell 12 is relieved, the suction member 131 has a lower risk of blocking the movement of the discharge, and can make the relief of the battery cell 12 more smooth.

[0176] According to some embodiments of the present application, please refer to Figures 3-8 The second pressure relief component 127 has a first surface 1273 facing the electrode assembly 122, and the suction member 131 is arranged on the first surface 1273.

[0177] The suction accessory 131 can be arranged on the first surface 1273 by means of adhesion, clamping, hot melting, or the like.

[0178] In the above scheme, the second pressure relief component 127 can be assembled into the battery monomer 12 together with the suction accessory 131 after pre-assembly, thereby reducing the assembly difficulty of the suction accessory 131.

[0179] According to some embodiments of the present application, refer to Figures 3-8 The electrode assembly 122 is in a winding type structure, and the electrode assembly 122 has a winding center hole 1221. The liquid injection hole 1271 is in position correspondence with the winding center hole 1221.

[0180] During the liquid injection process, the electrode liquid can flow into the bottom of the electrode assembly 122 through the winding center hole 1221 quickly, and gradually spread upward to uniformly soak the electrode assembly 122.

[0181] In some embodiments, a part of the first sealing member 130 is located in the winding center hole 1221, and the first sealing member 130 can share part of the space with the electrode assembly 122, which is conducive to improving the energy density of the battery monomer 12.

[0182] In the above scheme, since the liquid injection hole 1271 is in position correspondence with the winding center hole 1221, the electrolyte injected into the battery monomer 12 is more uniformly distributed during the liquid injection process of the battery monomer 12, and the soaking performance of the electrode assembly 122 is better.

[0183] According to some embodiments of the present application, refer to Figures 3-6 The shell 121 further includes a cover 133, and the shell 1212 further has a second opening 132. The cover 133 seals the second opening 132, and the cover 133 is the second pressure relief component 127.

[0184] In the embodiment in which the shell 1212 has a partition wall connected with the side wall 12121, the second opening 132 can be one or more through holes penetrating the second pressure relief component 127 in the thickness direction of the partition wall.

[0185] In the above scheme, the second opening 132 can serve as a pressure relief channel when the battery monomer 12 is relieved, so that the second pressure relief component 127 is opened in time. Meanwhile, by setting the cover 133 sealing the second opening 132 as the second pressure relief component 127, the processing difficulty of the second pressure relief component 127 can be reduced.

[0186] According to some embodiments of the present application, refer to Figures 3-6The shell 1212 includes a side wall 12121 and a flange portion 12122. The side wall 12121 surrounds the electrode assembly 122, and one end of the side wall 12121 is closed to form the first opening 129. The flange portion 12122 protrudes from the inner circumferential surface of the side wall 12121 and surrounds the second opening 132. The cover 133 is connected to the flange portion 12122 and covers the second opening 132.

[0187] In some embodiments, the flange portion 12122 is integrally formed with the side wall 12121.

[0188] In some embodiments, the shell 1212 has an H-shaped cross section, i.e., corresponding to the above-mentioned embodiment in which the shell 1212 has the oppositely arranged first opening 129 and third opening 139.

[0189] In the above-mentioned solution, the flange portion 12122, while surrounding the second opening 132, can also serve as an assembly base of the cover 133, thereby reducing the assembly difficulty of the cover 133, i.e., the second pressure relief component 127.

[0190] According to some embodiments of the present application, please refer to Figures 3-6 and Figure 9 and Figure 10 The battery monomer 12 further includes a first current collector 136, and the electrode assembly 122 includes a main body 1222 and a first tab 1223. The first tab 1223 is arranged at one end of the main body 1222 close to the second pressure relief component 127. The first tab 1223 is connected to the first current collector 136, and the first current collector 136 is connected to the flange portion 12122.

[0191] The first tab 1223 can be a positive tab or a negative tab.

[0192] The connection manner of the first current collector 136 and the flange portion 12122 can include, but is not limited to, clamping or welding, etc.

[0193] In the above-mentioned solution, since the first tab 1223 is connected to the first current collector 136, and the first current collector 136 is connected to the flange portion 12122. The shell 121 serves as an output pole of the battery monomer 12. Compared with the battery monomer 12 in which the electrode assembly 122 is led out by the electrode terminal, the space occupied by the electrode terminal is saved, which is conducive to improving the energy density of the battery monomer 12.

[0194] According to some embodiments of the present application, please refer to Figures 3-6 and Figure 9 and Figure 10The first current collector 136 is welded with the flange portion 12122 to form a first welding mark 134, and the second pressure relief component 127 is welded with the flange portion 12122 to form a second welding mark 135. The first welding mark 134 and the second welding mark 135 do not overlap in the thickness direction of the first pressure relief component 126.

[0195] In some embodiments, the first welding mark 134 and the second welding mark 135 are formed by laser welding.

[0196] In the above scheme, since the two welding marks do not overlap, the welding difficulty between the first current collector 136, the second pressure relief component 127, and the flange portion 12122 can be reduced. Meanwhile, the connection stability between the three can be improved.

[0197] According to some embodiments of the present application, please refer to Figures 3-6 and Figure 9 and Figure 10 The battery monomer 12 further includes a first electrode terminal 137 and a second current collector 138. The electrode assembly 122 further includes a second tab 1224, which is opposite in polarity to the first tab 1223, and is arranged at an end of the main body 1222 away from the second pressure relief component 127. The shell 1212 includes a side wall 12121 and a bottom wall 12123, the side wall 12121 surrounds the bottom wall 12123, and an end of the side wall 12121 away from the bottom wall 12123 surrounds a first opening 129. The first electrode terminal 137 is arranged on the bottom wall 12123, the second tab 1224 is connected with the second current collector 138, and the second current collector 138 is connected with the first electrode terminal 137.

[0198] In some embodiments, the material of the shell 121 is aluminum, the first tab 1223 is a positive tab, and the second tab 1224 is a negative tab. The shell 121, as the positive electrode of the battery monomer 12, can have a higher potential, so as to reduce the risk of corrosion of the shell 121.

[0199] In the above scheme, the side wall 12121 and the bottom wall 12123 form the shell 1212 with the first opening 129, and the structural stability is higher.

[0200] According to some embodiments of the present application, please refer to Figures 3-6 and Figure 11 and Figure 12The battery monomer 12 further comprises a first electrode terminal 137 and a second current collector 138. The electrode assembly 122 further comprises a second tab 1224 opposite to the first tab 1223 in polarity, and the second tab 1224 is arranged at one end of the main body 1222 away from the second pressure relief component 127. The opposite ends of the shell 1212 form a first opening 129 and a third opening 139, and the shell 121 further comprises a second end cover 140, and the first end cover 28 closes the first opening 129, and the second end cover 140 closes the third opening 139. The first electrode terminal 137 is arranged at the second end cover 140, the second tab 1224 is connected with the second current collector 138, and the second current collector 138 is connected with the first electrode terminal 137.

[0201] Please refer to Figure 12 The electrode assembly 122 can be put into the shell when the second end cover 140 is opened, so that the energy density between the electrode assembly 122 and the peripheral wall of the shell 121 is not lost too much, which is beneficial to make the battery monomer 12 have higher energy density.

[0202] In the above scheme, since the opposite ends of the shell 1212 form the first opening 129 and the third opening 139, the electrode assembly 122 can be put into the shell from the first opening 129 or the third opening 139, and the risk of size restriction caused by the interference between the electrode assembly 122 and the shell 121 is low, which is beneficial to make the battery monomer 12 have higher energy density. At the same time, the first electrode terminal 137 can be assembled with the second end cover 140 in advance, and then the third opening 139 is closed to complete the assembly of the battery monomer 12, and the assembly difficulty of the first electrode terminal 137 is lower.

[0203] According to some embodiments of the present application, please refer to Figures 3-6 and Figures 9-12 The first tab 1223 is a negative tab, and the second tab 1224 is a positive tab.

[0204] In some embodiments, the battery monomer 12 is a lithium ion battery monomer 12, the material of the shell 121 is steel, the first tab 1223 is a negative tab, and the second tab 1224 is a positive tab, which can reduce the risk of electrochemical corrosion of the shell 121.

[0205] In the above scheme, the shell 121 of the battery monomer 12 serves as the negative electrode of the battery monomer 12, which can reduce the possibility of contact between external impurities and moisture and the shell 121, thereby improving the sealing performance of the battery monomer 12.

[0206] According to some embodiments of the present application, please refer to Figures 3-6 The electrode assembly 122 is in a winding structure, and along the winding axis direction of the electrode assembly 122, the second pressure relief component 127 is located between the electrode assembly 122 and the first pressure relief component 126.

[0207] When the electrode assembly 122 is in a wound structure, the amount of gas and electrolyte flowing along the winding axis direction of the electrode assembly 122 is large when pressure relief occurs. Arranging the first pressure relief component 126 and the second pressure relief component 127 in the winding axis direction of the electrode assembly 122 can make the exhaust discharge from the battery monomer 12 as soon as possible.

[0208] In the above scheme, arranging the first pressure relief component 126 and the second pressure relief component 127 in the winding axis direction of the electrode assembly 122 can reduce the risk of excessive deformation of the first pressure relief component 126 and the second pressure relief component 127 caused by the expansion deformation of the electrode assembly 122, and can also improve the pressure relief efficiency of the battery monomer 12.

[0209] According to some embodiments of the present application, please refer to Figures 3-6 , the first pressure relief component 126 and the second pressure relief component 127 are arranged in the winding axis direction of the electrode assembly 122.

[0210] In some embodiments, the first pressure relief component 126 and the second pressure relief component 127 are arranged in the winding axis direction of the electrode assembly 122, which can provide assembly space for the first sealing member 130, and can set a larger volume of the first sealing member 130, so as to reduce the risk of abnormal opening of the first pressure relief component 126 caused by the first sealing member 130 pressing the first pressure relief component 126 due to the too small assembly space while the battery monomer 12 has better sealing performance.

[0211] In the above scheme, since the first pressure relief component 126 and the second pressure relief component 127 are arranged in the winding axis direction of the electrode assembly 122, the risk of one of the first pressure relief component 126 and the second pressure relief component 127 deforming to cause the other to deform is low, and the reliability of the pressure relief component is high.

[0212] According to some embodiments of the present application, please refer to Figures 3-6 , the first pressure relief component 126 has a second surface 1261 facing the second pressure relief component 127, and the second surface 1261 is provided with a corrosion-resistant layer.

[0213] The types of the corrosion-resistant layer can include but are not limited to polyurethane three-proof paint, epoxy anticorrosive paint, water-based special reinforced acid and alkali resistant finish, strong acid resistant heavy-duty corrosion resistant paint, etc.

[0214] In the above scheme, the corrosion-resistant layer can reduce the risk of corrosion of the first pressure relief component 126.

[0215] According to some embodiments of the present application, please refer to Figures 3-6 , the material of the shell 121 is steel.

[0216] In the above scheme, the steel shell 121 has high structural strength and strong ability to resist external force impact, so that the battery monomer 12 has better structural stability.

[0217] According to some embodiments of the present application, please refer to Figures 3-6 The first pressure relief component 126 includes a first score groove 1262.

[0218] In some embodiments, the first score groove 1262 is arranged around the second opening 132.

[0219] In some embodiments, the first score groove 1262 is an annular structure.

[0220] In the above scheme, the first pressure relief component 126 has a weak part by setting the first score groove 1262, so that the first pressure relief component 126 can be opened along the first score groove 1262 as the edge when the battery monomer 12 is in thermal runaway. Such a first pressure relief component 126 does not occupy additional space of the battery monomer 12, so that the battery monomer 12 has higher equivalent density, and the processing difficulty is relatively low and the cost is relatively low.

[0221] According to some embodiments of the present application, please refer to Figures 3-6 The material of the first pressure relief component 126 and the second pressure relief component 127 is manganese steel.

[0222] In some embodiments, 1% to 5% manganese particles can be mixed into steel by mixing to form manganese steel.

[0223] In some embodiments, the first pressure relief component 126 and the second pressure relief component 127 can also be made of other materials with high overheating sensitivity.

[0224] In the above scheme, the first pressure relief component 126 and the second pressure relief component 127 made of manganese steel can reduce the risk of corrosion of the pressure relief component, and also have better overheating sensitivity, so that the pressure relief component can be opened in time.

[0225] According to some embodiments of the present application, please refer to Figures 3-6 The battery monomer 12 is a cylindrical battery monomer 12.

[0226] According to some embodiments of the present application, please refer to Figure 2 The present application provides a battery device 100, which includes the battery monomer 12 in one or more embodiments.

[0227] In the above scheme, since the one or more battery monomers 12 have high reliability, the battery device 100 including the battery monomer 12 in one or more embodiments also has high reliability.

[0228] According to some embodiments of the present application, please refer to Figure 2 、 Figure 4 、 Figure 6 、 Figure 9 and Figure 10 , the first pressure relief component 126 and the second pressure relief component 127 are both located below the electrode assembly 122 along the direction of gravity.

[0229] In the above solution, since the first pressure relief component 126 and the second pressure relief component 127 are both located below the electrode assembly 122 along the direction of gravity, when the battery monomer 12 is in thermal runaway, the exhaust is more likely to be discharged outside the battery monomer 12 in a timely manner under the guidance of gravity, and is more likely to be guided outside the battery device 100, which is beneficial to reduce the risk of damage to other components in the battery device 100 by the exhaust, so that the battery device 100 has higher reliability. At the same time, taking the battery device 100 used in the vehicle 1000 as an example, downward pressure relief can reduce the risk of damage to passengers by the exhaust.

[0230] According to some embodiments of the present application, please refer to Figure 1 , the present application provides a power consuming device, the power consuming device comprising the battery monomer 12 in one or more embodiments described above or the battery device 100 in one or more embodiments described above, and the battery monomer 12 or the battery device 100 is used to provide electric energy.

[0231] In the above solution, since the battery monomer 12 or the battery device 100 has higher reliability, the power consuming device comprising the battery monomer 12 or the battery device 100 also has higher reliability.

[0232] According to some embodiments of the present application, please refer to Figures 3-10 , the present application provides a cylindrical battery monomer 12, the battery monomer 12 comprising a shell 121 and an electrode assembly 122, the electrode assembly 122 being of a winding type structure, and the electrode assembly 122 being arranged in the shell 121. Wherein, the shell 121 comprises a first pressure relief component 126 and a second pressure relief component 127, the electrode assembly 122 being of a winding type structure, and along the winding axis direction of the electrode assembly 122, the second pressure relief component 127 is located between the electrode assembly 122 and the first pressure relief component 126. Along the winding axis direction of the electrode assembly 122, the first pressure relief component 126 and the second pressure relief component 127 are arranged in a spaced manner. The first pressure relief component 126 comprises a first notch groove 1262. The second pressure relief component 127 comprises a second notch groove 1272.

[0233] The shell 121 is made of steel. The shell 121 includes a shell body 1212, a first end cover 28, and a cover body 133. The shell body 1212 has a first opening 129, and the first end cover 28 closes the first opening 129. The first end cover 28 is a first pressure relief component 126. The shell body 1212 also has a second opening 132, and the cover body 133 closes the second opening 132. The cover body 133 is a second pressure relief component 127. The shell body 1212 includes a side wall 12121 and a flange portion 12122. The side wall 12121 surrounds the electrode assembly 122. One end of the side wall 12121 forms the first opening 129. The flange portion 12122 protrudes from an inner circumferential surface of the side wall 12121 and surrounds the second opening 132. The cover body 133 is connected to the flange portion 12122 and covers the second opening 132.

[0234] The battery cell 12 also includes a first current collector 136, a second current collector 138, and a first electrode terminal 137. The electrode assembly 122 includes a main body 1222, a first tab 1223, and a second tab 1224. The first tab 1223 is arranged at one end of the main body 1222 close to the second pressure relief component 127. The first tab 1223 is connected to the first current collector 136, and the first current collector 136 is connected to the flange portion 12122. The second tab 1224 is arranged at one end of the main body 1222 away from the second pressure relief component 127. The shell body 1212 includes a side wall 12121 and a bottom wall 12123. The side wall 12121 surrounds the bottom wall 12123. One end of the side wall 12121 away from the bottom wall 12123 forms the first opening 129. The first electrode terminal 137 is arranged on the bottom wall 12123. The second tab 1224 is connected to the second current collector 138, and the second current collector 138 is connected to the first electrode terminal 137. The first tab 1223 is a negative tab, and the second tab 1224 is a positive tab.

[0235] The second pressure relief component 127 is provided with a liquid injection hole 1271. The electrode assembly 122 has a winding center hole 1221, and the liquid injection hole 1271 is positionally corresponding to the winding center hole 1221. The battery cell 12 also includes a first sealing member 130 that closes the liquid injection hole 1271. The first sealing member 130 includes a sealing portion 1301, a first limiting portion 1302, and a second limiting portion 1303. At least part of the sealing portion 1301 is located in the liquid injection hole 1271. The first limiting portion 1302 is arranged at one end of the sealing portion 1301 and protrudes from an outer circumferential surface of the sealing portion 1301. The second limiting portion 1303 is arranged at the other end of the sealing portion 1301 and protrudes from the outer circumferential surface of the sealing portion 1301. The first limiting portion 1302 is located on a side of the second pressure relief component 127 facing the first pressure relief component 126. The second limiting portion 1303 is located on a side of the second pressure relief component 127 away from the first pressure relief component 126.

[0236] The first pressure relief component 126 is provided with a reinforcing rib 141, a front projection of the reinforcing rib 141 at least partially overlaps a front projection of the first sealing member 130 in the same projection plane perpendicular to the thickness direction of the first pressure relief component 126.

[0237] Please refer to Figure 3 During the liquid injection or formation process of the battery monomer 12, the second pressure relief component 127 is connected with the flange part 12122, the first pressure relief component 126, i.e. the first end cover 28, is separated from the shell 1212, and after the formation is completed, the first sealing member 130 is inserted into the liquid injection hole 1271, and then the first pressure relief component 126 and the shell 1212 are welded. After the battery monomer 12 is assembled and put into the box, it is in a state that the first electrode terminal 137 is located above the first end cover 28 in the direction of gravity. Figure 4

[0238] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.​

Claims

1. A battery cell, characterized by, The battery monomer comprises: a shell; an electrode assembly arranged in the shell; wherein the shell comprises a first pressure relief component and a second pressure relief component, the second pressure relief component is located between the electrode assembly and the first pressure relief component.

2. The battery cell of claim 1, wherein, The shell comprises a shell body and a first end cover, the shell body has a first opening, the first end cover closes the first opening, and the first end cover is the first pressure relief component.

3. The battery cell of claim 2, wherein, The second pressure relief component is provided with a liquid injection hole; The battery monomer further comprises a first sealing member, and the first sealing member closes the liquid injection hole.

4. The battery cell of claim 3, wherein, The first sealing member comprises a sealing part, a first limiting part and a second limiting part, at least part of the sealing part is located in the liquid injection hole, the first limiting part is arranged at one end of the sealing part and protrudes from the outer peripheral surface of the sealing part, the second limiting part is arranged at the other end of the sealing part and protrudes from the outer peripheral surface of the sealing part, the first limiting part is located on one side of the second pressure relief component facing the first pressure relief component, and the second limiting part is located on the other side of the second pressure relief component away from the first pressure relief component.

5. The battery cell of claim 3, wherein, The first pressure relief component is provided with a reinforcing rib, and in the same projection plane perpendicular to the thickness direction of the first pressure relief component, the orthogonal projection of the reinforcing rib at least partially overlaps the orthogonal projection of the first sealing member.

6. The battery cell of claim 3, wherein, The battery monomer further comprises a suction member, the suction member is arranged on one side of the second pressure relief component facing the electrode assembly, and the suction member is configured to be capable of adsorbing electrolyte.

7. The battery cell of claim 6, wherein, The second pressure relief component comprises a second notch groove, and in the same projection plane perpendicular to the thickness direction of the first pressure relief component, the orthogonal projection of the suction member does not overlap the orthogonal projection of the second notch groove.

8. The battery cell of claim 6, wherein, The second pressure relief component has a first surface facing the electrode assembly, and the suction member is arranged on the first surface.

9. The battery cell of claim 3, wherein, The electrode assembly has a winding center hole, and the liquid injection hole is positionally corresponding to the winding center hole.

10. The battery cell of claim 2, wherein, The shell further comprises a cover body, the shell body further has a second opening, the cover body closes the second opening, and the cover body is the second pressure relief component.

11. The battery cell of claim 10, wherein, The shell comprises a side wall and a flange part, the side wall is arranged around the electrode assembly, one end of the side wall is closed to form the first opening, the flange part protrudes from the inner peripheral surface of the side wall and surrounds the second opening, and the cover body is connected to the flange part and covers the second opening.

12. The battery cell of claim 11, wherein, The battery monomer further comprises a first current collector, the electrode assembly comprises a main body and a first tab, the first tab is arranged at one end of the main body close to the second pressure relief component, the first tab is connected to the first current collector, and the first current collector is connected to the flange part.

13. The battery cell of claim 12, wherein, The first current collector and the flange part are welded to form a first welding mark, the second pressure relief component and the flange part are welded to form a second welding mark, and along the thickness direction of the first pressure relief component, the first welding mark and the second welding mark do not overlap.

14. The battery cell of claim 12, wherein, The battery monomer further comprises a first electrode terminal and a second current collector; The electrode assembly further comprises a second tab opposite to the first tab, the second tab being arranged at an end of the main body away from the second pressure relief component; The shell comprises a side wall and a bottom wall, the side wall being arranged around the bottom wall, an end of the side wall away from the bottom wall forming the first opening; The first electrode terminal is arranged on the bottom wall, the second tab is connected with the second current collector, and the second current collector is connected with the first electrode terminal.

15. The battery cell of claim 12, wherein, The battery cell further comprises a first electrode terminal and a second current collector; The electrode assembly further comprises a second tab opposite to the first tab, the second tab being arranged at an end of the main body away from the second pressure relief component; The shell comprises a side wall and a bottom wall, the side wall being arranged around the bottom wall, an end of the side wall away from the bottom wall forming the first opening; The first electrode terminal is arranged on the bottom wall, the second tab is connected with the second current collector, and the second current collector is connected with the first electrode terminal.

16. The battery cell of claim 14 or 15, wherein, The first tab is a negative tab, and the second tab is a positive tab.

17. The battery cell of claim 1, wherein, The electrode assembly is in a wound structure, and along a winding axis direction of the electrode assembly, the second pressure relief component is located between the electrode assembly and the first pressure relief component.

18. The battery cell of claim 17, wherein, Along the winding axis direction of the electrode assembly, the first pressure relief component and the second pressure relief component are arranged in a spaced manner.

19. The battery cell of claim 1, wherein, The first pressure relief component has a second surface facing the second pressure relief component, and the second surface is provided with a corrosion-resistant layer.

20. The battery cell of claim 1, wherein, The shell is made of steel.

21. The battery cell of claim 1, wherein, The first pressure relief component comprises a first score groove.

22. The battery cell of claim 1, wherein, The first pressure relief component and the second pressure relief component are made of manganese steel.

23. The battery cell of claim 1, wherein, The battery cell is a cylindrical battery cell.

24. A battery device, characterized by The battery cell comprises the battery cell according to any one of claims 1-23.

25. The battery device of claim 24, wherein, The first pressure relief component and the second pressure relief component are both located below the electrode assembly along a gravity direction.

26. An electrical device, comprising: The use device comprises the battery cell according to any one of claims 1-23 or the battery device according to claim 24 or 25, and the battery cell or the battery device is used to provide electric energy.

Images