Battery cell, battery apparatus, and electric device

Abstract

The present application provides a battery cell, a battery apparatus, and an electric device. The battery cell comprises a casing, an electrode assembly, a pressure relief mechanism, and a current collecting member. The casing has a wall portion, the electrode assembly is accommodated in the casing, the pressure relief mechanism is arranged on the wall portion, and the current collecting member is located between the electrode assembly and the pressure relief mechanism. The current collecting member comprises a first connector and a second connector connected to each other. One of the first connector and the second connector is connected to the electrode assembly, and the other is connected to the casing. The first connector is provided with a vent hole, and in the thickness direction of the wall portion, the projection of the second connector is at least partially located in the vent hole. The vent hole comprises a first region covered by the second connector and a second region not covered by the second connector, and the second region is used for guiding emissions from within the battery cell to the pressure relief mechanism. The emissions within the battery cell can flow through the second region to the pressure relief mechanism, thereby reducing the risk of pressure buildup within the battery cell, helping to improve the reliability of the battery cell.

Description

Battery cell, battery device and electric equipment Cross-reference to related applications

[0001] This application claims priority to the Chinese patent application with the title "Battery cell, battery device and electric equipment" filed on August 12, 2024 (application number: 202421944575.4), the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of batteries, in particular to a battery cell, a battery device and an electric equipment. BACKGROUND

[0003] Batteries are widely used in the field of new energy, for example, electric vehicles, new energy vehicles, etc. New energy vehicles and electric vehicles have become a new trend in the development of the automotive industry. The development of battery technology needs to consider various design factors, such as battery life, energy density, discharge capacity, charge-discharge rate, and other performance parameters. In addition, the reliability of the battery also needs to be considered. However, the reliability of the current battery is poor. SUMMARY

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

[0005] In a first aspect, the embodiments of the present application provide a battery cell, which comprises a shell, an electrode assembly, a pressure relief mechanism and a current collecting member, the shell has a wall portion; the electrode assembly is accommodated in the shell; the pressure relief mechanism is arranged on the wall portion; the current collecting member is located between the electrode assembly and the pressure relief mechanism; wherein the current collecting member comprises a first connecting body and a second connecting body connected to each other, one of the first connecting body and the second connecting body is connected with the electrode assembly, and the other is connected with the shell, the first connecting body is provided with an exhaust hole, along the thickness direction of the wall portion, the projection of the second connecting body is at least partially located in the exhaust hole, the exhaust hole comprises a first area covered by the second connecting body and a second area not covered by the second connecting body, and the second area is used for guiding the discharge in the battery cell to the pressure relief mechanism.

[0006] In the above technical solution, the first connecting body of the current collecting member is provided with an exhaust hole, and the exhaust hole has a second area not covered by the second connecting body, so that the discharge in the battery cell can flow to the pressure relief mechanism through the second area, which facilitates the rapid pressure relief of the battery cell, reduces the risk of pressure retention of the battery cell, and is beneficial to improve the reliability of the battery cell.

[0007] As an optional technical solution of the embodiment of the present application, the second connecting body comprises a plurality of first connecting portions, and the projection of the first connecting portion is located in the exhaust hole along the thickness direction of the wall portion, and the plurality of first connecting portions are arranged at intervals along the circumferential direction of the exhaust hole in the first connecting body.

[0008] In the above technical solution, by arranging a plurality of first connecting portions, on the one hand, the plurality of first connecting portions are connected with the wall portion or the electrode assembly, which is conducive to increasing the flow area. On the other hand, by arranging the plurality of first connecting portions at intervals along the circumferential direction of the exhaust hole in the first connecting body, the exhaust in the battery monomer can flow to the pressure relief mechanism through the area between the adjacent two first connecting portions, which is conducive to rapid pressure relief of the battery monomer and improves the reliability of the battery monomer.

[0009] As an optional technical solution of the embodiment of the present application, the second region comprises a first hollow area and a plurality of second hollow areas, the plurality of first connecting portions are arranged around the first hollow area, the first hollow area is communicated with the second hollow area, and one second hollow area is formed between the adjacent two first connecting portions.

[0010] In the above technical solution, by communicating the first hollow area and the second hollow area, it is conducive to increasing the area of the second region, so as to facilitate the exhaust in the battery monomer to quickly pass through the current collecting member to reach the pressure relief mechanism, realize rapid pressure relief of the battery monomer, reduce the risk of battery monomer pressure accumulation, and improve the reliability of the battery monomer.

[0011] As an optional technical solution of the embodiment of the present application, the second connecting body further comprises a second connecting portion, the projection of the second connecting portion is located in the exhaust hole along the thickness direction of the wall portion, and the second connecting portion connects a plurality of first connecting portions.

[0012] In the above technical solution, by arranging the second connecting portion to connect a plurality of first connecting portions, it is conducive to increasing the structural strength of the second connecting body, so that the first connecting portion is not easy to deform under external force, and it is conducive to stabilizing and reliably connecting the first connecting portion with the wall portion or the electrode assembly.

[0013] As an optional technical solution of the embodiment of the present application, the second region comprises a first hollow area and a plurality of second hollow areas, the plurality of first connecting portions are arranged around the second connecting portion, the first hollow area is located in the second connecting portion, the second connecting portion separates the first hollow area and the second hollow area, and one second hollow area is formed between the adjacent two first connecting portions.

[0014] In the above technical solution, the first hollow area is further arranged in the second connecting portion, which is conducive to increasing the area of the second region, reducing the risk of battery monomer pressure accumulation, and improving the reliability of the battery monomer.

[0015] As an optional technical solution of the embodiment of the present application, the second connecting part is configured to be damaged when the battery monomer is pressure released.

[0016] In the above technical solution, the second connecting part is damaged when the battery monomer is pressure released, so that the area of the second region is larger when the battery monomer is pressure released, thereby facilitating the exhaust in the battery monomer to quickly pass through the current collecting member to reach the pressure release mechanism, realizing the fast pressure release of the battery monomer, reducing the risk of pressure retention of the battery monomer, and facilitating to improve the reliability of the battery monomer.

[0017] As an optional technical solution of the embodiment of the present application, the pressure release mechanism has a weak part, and the pressure release mechanism is configured to split along at least part of the weak part when the battery monomer is pressure released; the strength of the second connecting part is lower than the strength of the weak part.

[0018] In the above technical solution, by making the strength of the second connecting part lower than the strength of the weak part, the second connecting part is damaged under the action of the exhaust of the battery monomer when the battery monomer is pressure released, further increasing the area of the second region, thereby facilitating the exhaust in the battery monomer to quickly pass through the current collecting member to reach the pressure release mechanism, realizing the fast pressure release of the battery monomer, reducing the risk of pressure retention of the battery monomer, and facilitating to improve the reliability of the battery monomer.

[0019] As an optional technical solution of the embodiment of the present application, the second connecting part is of a ring structure.

[0020] In the above technical solution, when the second connecting part is of a ring structure, the exhaust of the battery monomer can flow to the pressure release mechanism through the inside of the ring structure, realizing the fast pressure release of the battery monomer, reducing the risk of pressure retention of the battery monomer, and facilitating to improve the reliability of the battery monomer.

[0021] As an optional technical solution of the embodiment of the present application, the electrode assembly has a center hole, and a projection of a hole wall surface of the center hole is located in the first hollowed-out region in the thickness direction of the wall part.

[0022] In the above technical solution, when the projection of the hole wall surface of the center hole is located in the first hollowed-out region, it indicates that the area of the first hollowed-out region is larger than the area of the center hole, thereby facilitating the exhaust in the center hole to flow to the pressure release mechanism through the first hollowed-out region.

[0023] As an optional technical solution of the embodiment of the present application, the electrode assembly has a tab, and the first connecting part is welded with the tab.

[0024] In the technical scheme, the first connecting part is welded with the tab, and the first connecting body is connected with the wall part, so that the space is reasonably utilized, the connection between the current collecting member, the electrode assembly and the wall part is more stable, and the manufacturing is more simple and convenient, and the manufacturing cost of the battery monomer is reduced.

[0025] As an optional technical scheme of the embodiment, the first connecting part extends along the radial direction of the exhaust hole.

[0026] In the technical scheme, the first connecting part extends along the radial direction of the exhaust hole, so that the first connecting part is connected with the wall part or the electrode assembly. Especially for the cylindrical battery monomer, the first connecting part extends along the radial direction of the exhaust hole, and is electrically connected with the tab.

[0027] As an optional technical scheme of the embodiment, the pressure relief mechanism has a weak part, the pressure relief mechanism is configured to split along at least part of the weak part when the battery monomer is relieved, the weak part defines a predetermined pressure relief area, and a projection of the predetermined pressure relief area is located in the exhaust hole along the thickness direction of the wall part.

[0028] In the technical scheme, the projection of the predetermined pressure relief area is located in the exhaust hole, on the one hand, the position of the predetermined pressure relief area corresponds to the position of the exhaust hole, so that the exhaust of the battery monomer can pass through the current collecting member to reach the pressure relief mechanism. On the other hand, the area of the exhaust hole is large, so that the battery monomer can be quickly relieved, the risk of pressure accumulation of the battery monomer is reduced, and the reliability of the battery monomer is improved.

[0029] As an optional technical scheme of the embodiment, the pressure relief mechanism is provided with a pressure relief groove, the pressure relief mechanism forms the weak part in the region provided with the pressure relief groove, and a projection of a groove bottom surface of the pressure relief groove is located in the exhaust hole along the thickness direction of the wall part.

[0030] In the technical scheme, when the projection of the groove bottom surface of the pressure relief groove is located in the exhaust hole, the area of the exhaust hole is larger, the pressure relief of the battery monomer is more smooth, and the timeliness of the pressure relief of the battery monomer is improved.

[0031] As an optional technical scheme of the embodiment, the pressure relief mechanism has a weak part, the pressure relief mechanism is configured to split along at least part of the weak part when the battery monomer is relieved, the weak part defines a predetermined pressure relief area, and a projection of the predetermined pressure relief area is located in the exhaust hole along the thickness direction of the wall part.

[0032] In the technical solution, by making the projection of the predetermined pressure relief area at least partially located in the second area, that is, at least part of the predetermined pressure relief area corresponds to the position of the second area, the discharge in the battery cell can be conveniently discharged to the pressure relief mechanism through the current collecting member.

[0033] As an optional technical solution of the embodiment, the pressure relief mechanism has a weak part, the pressure relief mechanism is configured to split along at least part of the weak part when the battery cell is relieved, and the weak part defines a predetermined pressure relief area; the area of the second area is greater than the area of the predetermined pressure relief area.

[0034] In the technical solution, by making the area of the second area greater than the area of the predetermined pressure relief area, the battery cell can be quickly relieved, the risk of battery cell pressure build-up can be reduced, and the reliability of the battery cell can be improved.

[0035] As an optional technical solution of the embodiment, the first connecting body is directly connected to the wall part, and the second connecting body is connected to the electrode assembly.

[0036] In the technical solution, by making the first connecting body connected to the wall part and the second connecting body connected to the electrode assembly, the manufacturing can be simplified, and the manufacturing cost of the battery cell can be reduced.

[0037] As an optional technical solution of the embodiment, the shell includes a side wall, the side wall is arranged around the wall part and connected to the wall part; the first connecting body is directly connected to the side wall, and the second connecting body is connected to the electrode assembly.

[0038] In the technical solution, by making the first connecting body connected to the side wall and the second connecting body connected to the electrode assembly, on the one hand, the electrical energy of the electrode assembly can be output or input to the electrode assembly through the side wall, and the wiring of the battery cell and other electrical components can be facilitated. On the other hand, the manufacturing can be simplified, and the manufacturing cost of the battery cell can be reduced.

[0039] As an optional technical solution of the embodiment, the pressure relief mechanism is integrally formed with the wall part.

[0040] In the technical solution, the pressure relief mechanism is integrally formed with the wall part, without the need for additional welding or bonding processes, which can reduce the risk of liquid leakage of the pressure relief mechanism. Moreover, during production, the initiation pressure of the processed battery cells can be easily made consistent.

[0041] As an optional technical solution of the embodiment, the pressure relief mechanism is separately provided with the wall part, the wall part is provided with a pressure relief hole, and the pressure relief mechanism is mounted on the wall part and covers the pressure relief hole.

[0042] In the technical solution, the pressure relief mechanism is arranged on the wall part, so as to facilitate the manufacturing.

[0043] As an optional technical solution of the embodiment, the battery cell is a cylindrical battery cell.

[0044] In a second aspect, the embodiment also provides a battery device, which comprises the battery cell.

[0045] In a third aspect, the embodiment also provides a power consumption device, which comprises the battery cell, and the battery cell is used to provide power for the power consumption device. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0047] Fig. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0048] Fig. 2 is an exploded view of a battery device according to some embodiments of the present application;

[0049] Fig. 3 is a structural schematic diagram of a battery cell according to some embodiments of the present application;

[0050] Fig. 4 is an exploded view of a battery cell according to some embodiments of the present application;

[0051] Fig. 5 is a structural schematic diagram of a current collecting member according to some embodiments of the present application;

[0052] Fig. 6 is a structural schematic diagram of a first connecting body according to some embodiments of the present application;

[0053] Fig. 7 is a partial sectional view of a battery cell according to some embodiments of the present application;

[0054] Fig. 8 is an exploded view of a battery cell according to other embodiments of the present application;

[0055] Fig. 9 is a structural schematic diagram of a current collecting member according to other embodiments of the present application;

[0056] Fig. 10 is a partial sectional view of a battery cell according to other embodiments of the present application.

[0057] Icon: 10 - case; 11 - first part; 12 - second part; 20 - battery cell; 21 - outer shell; 211 - shell; 2111 - side wall; 2112 - bottom wall; 212 - end cover; 213 - wall portion; 22 - electrode assembly; 221 - main body portion; 222 - tab; 223 - central hole; 23 - pressure relief mechanism; 231 - weak portion; 232 - pressure relief groove; 233 - predetermined pressure relief area; 24 - current collecting member; 241 - first connecting body; 2411 - exhaust hole; 242 - second connecting body; 2421 - first connecting portion; 2422 - second connecting portion; 243 - second region; 2431 - first hollowed-out area; 2432 - second hollowed-out area; 25 - electrode terminal; 100 - battery device; 200 - controller; 300 - motor; 1000 - vehicle. DETAILED DESCRIPTION

[0058] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

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

[0060] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive or alternative to other embodiments.

[0061] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mount", "connect", "connection", "attach" should be broadly interpreted, for example, can be fixedly connected, or can be detachably connected, or integrally connected, can be directly connected, or indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

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

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

[0064] "Multiple" appearing in the present application means two or more (including two).

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

[0066] The battery cell can be 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. The embodiments of the present application are not limited thereto.

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

[0068] 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 arranged on at least one surface of the positive electrode current collector.

[0069] As an example, the positive electrode current collector has two opposite surfaces in its own thickness direction, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

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

[0071] As an example, the 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 LiFeP04 (which can also be referred to simply as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnP04), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, lithium cobalt oxide (such as LiCo02), lithium nickel oxide (such as LiNi02), lithium manganese oxide (such as LiMn02, LiMn204), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (which can also be referred to simply as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be referred to simply as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be referred to simply as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be referred to simply as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be referred to simply as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05O2) and modified compounds thereof, etc.

[0072] 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 employed as the positive electrode, the foamed metal surface can be free of the positive electrode active material, or can be provided with the positive electrode active material. As an example, the foamed metal can be filled or / and deposited with a lithium source material, potassium metal, or sodium metal. The lithium source material can be lithium metal and / or a lithium-rich material.

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

[0074] As an example, the negative electrode current collector can employ a metal foil, a foamed metal, or a composite current collector. For example, as the metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, 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.).

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

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

[0077] As an example, the negative electrode active material can employ a negative electrode active material known in the art for use in a battery cell. As an example, the negative electrode 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 electrode active material can also be used. These negative electrode active materials can be used alone or in combination of two or more.

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

[0079] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0080] In some embodiments, the separator is a separator film. The separator film can be of various types, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0081] As an example, the material of the separator film can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film. When the separator film is a multi-layer composite film, the materials of the layers can be the same or different. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0082] 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 and negative electrodes.

[0083] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The electrolyte can be in a liquid state, a gel state, or a solid state. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0084] In some embodiments, the electrolyte salt can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoroboric oxalate, lithium bisoxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorodioxalate phosphate.

[0085] 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, butanedisulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether solvent. The ether solvent 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.

[0086] Among them, the gel-state electrolyte includes a polymer as a skeleton network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0087] Among them, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0088] As an example, the polymer solid electrolyte can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid-lithium salt, cellulose, etc.

[0089] As an example, the inorganic solid electrolyte can include one or more of oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfide, argyrodite), amorphous sulfide), halide solid electrolyte, nitride solid electrolyte, and hydride solid electrolyte.

[0090] As an example, the composite solid electrolyte is formed by adding inorganic solid electrolyte fillers to the polymer solid electrolyte.

[0091] 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.

[0092] In some embodiments, the electrode assembly is in a stack structure.

[0093] 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 are alternately stacked.

[0094] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet is folded to form a plurality of folded segments that are stacked, and one positive electrode sheet is clamped between adjacent folded segments.

[0095] As an example, the positive electrode sheet and the negative electrode sheet are both folded to form a plurality of folded segments that are stacked.

[0096] As an example, a plurality of separators can be provided, and each of the separators is provided between any adjacent positive electrode sheet or negative electrode sheet.

[0097] As an example, the separators can be continuously provided and provided between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0098] In some embodiments, the electrode assembly can have a shape of a cylindrical shape, a flat shape, or a multi-prism shape, etc.

[0099] In some embodiments, the electrode assembly is provided with a tab, and the tab can guide current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0100] In some embodiments, the battery cell can include a housing. The housing is used to package components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0101] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, the housing can serve to protect the electrode assembly and to some extent prevent leakage of electrolyte and the like. When the housing is a non-sealed structure, the housing can serve to protect the electrode assembly, and a sealing bag can be further included between the housing and the electrode assembly for encapsulating the electrode assembly, electrolyte, and the like. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film.

[0102] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, and the prismatic battery cell includes, but is not limited to, a square battery cell, a blade battery cell, a multi-prismatic battery cell, for example, a hexagonal battery cell, and the like.

[0103] The battery device referred to in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0104] In some embodiments, the battery device can be a battery module, and when there are a plurality of battery cells, the plurality of battery cells are arranged and fixed to form a battery module.

[0105] In some embodiments, the battery device can be a battery pack, and the battery pack includes a box body and battery cells, and the battery cells or the battery module are accommodated in the box body.

[0106] In some embodiments, the box body can be part of the chassis structure of the vehicle. For example, part of the box body can be at least part of the floor of the vehicle, or part of the box body can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0107] In some embodiments, the battery device can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0108] At present, from the development of market situation, the application of batteries is more and more extensive. The batteries are not only applied to energy storage power systems such as hydroelectric, thermal, wind, and solar power stations, but also widely applied to electric bicycles, electric motorcycles, electric vehicles, and other electric vehicles, as well as military equipment, aerospace, and other fields. With the continuous expansion of the application field of batteries, the demand for the market is also increasing.

[0109] The development of battery technology needs to consider many design factors, such as battery life, energy density, discharge capacity, charge-discharge rate, and other performance parameters. In addition, the reliability of the battery also needs to be considered. However, the current reliability of the battery is poor.

[0110] For the battery monomer, in order to improve the reliability of the battery monomer, the prior art is to provide a pressure relief mechanism on the end cover. When the internal pressure of the battery monomer reaches the detonation pressure, the pressure relief mechanism is opened to release the internal pressure of the battery monomer, thereby reducing the risk of explosion and fire of the battery monomer.

[0111] However, when the current collecting member is arranged between the pressure relief mechanism and the electrode assembly, the current collecting member will prevent the discharge in the battery monomer from flowing to the pressure relief mechanism, thereby causing the battery monomer to be pressurized, making the battery monomer prone to explosion and fire, and resulting in poor reliability of the battery monomer.

[0112] In view of this, the embodiments of the present application provide a battery monomer, which comprises a shell, an electrode assembly, a pressure relief mechanism and a current collecting member. The shell has a wall portion, the electrode assembly is accommodated in the shell, the pressure relief mechanism is arranged on the wall portion, and the current collecting member is located between the electrode assembly and the pressure relief mechanism. The current collecting member comprises a first connecting body and a second connecting body connected to each other, one of the first connecting body and the second connecting body is connected to the electrode assembly, and the other is connected to the shell. The first connecting body is provided with an exhaust hole. In the thickness direction of the wall portion, the projection of the second connecting body is at least partially located in the exhaust hole. The exhaust hole comprises a first area covered by the second connecting body and a second area not covered by the second connecting body, and the second area is used to guide the discharge in the battery monomer to the pressure relief mechanism.

[0113] The first connecting body of the current collecting member is provided with an exhaust hole, and the exhaust hole has a second area not covered by the second connecting body, so that the discharge in the battery monomer can flow to the pressure relief mechanism through the second area, facilitating the rapid pressure relief of the battery monomer, reducing the risk of pressure build-up of the battery monomer, and being beneficial to improving the reliability of the battery monomer.

[0114] The technical solutions described in the embodiments of the present application are applicable to battery devices and electric equipment using batteries.

[0115] The electric equipment can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game machine, an electric car toy, an electric ship toy and an electric plane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, which can include but is not limited to an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc.

[0116] The following embodiments take the vehicle 1000 as an example for convenience of description.

[0117] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head, 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 an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 being used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0118] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0119] Please refer to FIG. 2, which is an exploded view of the battery device 100 according to some embodiments of the present application. The battery device 100 includes a box body 10 and a battery cell 20, the battery cell 20 being accommodated in the box body 10. The box body 10 is used to provide an accommodation space for the battery cell 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first part 11 and a second part 12, the first part 11 and the second part 12 being mutually covered, and the first part 11 and the second part 12 jointly defining an accommodation space for accommodating the battery cell 20. The second part 12 can be a hollow structure with one end being open, and the first part 11 can be a plate-shaped structure, the first part 11 being covered on the open side of the second part 12 to jointly define the accommodation space with the second part 12; the first part 11 and the second part 12 can also be hollow structures with one side being open, the open side of the first part 11 being covered on the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0120] In the battery device 100, the battery cells 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed manner, and the whole of the multiple battery cells 20 is accommodated in the case 10. Of course, the battery device 100 can also be that the multiple battery cells 20 are connected in series, in parallel, or in a mixed manner to form a battery module, and the multiple battery modules are connected in series, in parallel, or in a mixed manner to form a whole, and the whole is accommodated in the case 10. The battery device 100 can further include other structures, for example, the battery device 100 can further include a current collecting component for realizing the electrical connection between the multiple battery cells 20.

[0121] Each battery cell 20 can be a secondary battery cell or a primary battery cell, and can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0122] Please refer to FIG. 3, FIG. 4, FIG. 5, FIG. 6, and FIG. 7. FIG. 3 is a structural schematic diagram of a battery cell 20 provided by some embodiments of the present application. FIG. 4 is an exploded view of the battery cell 20 provided by some embodiments of the present application. FIG. 5 is a structural schematic diagram of a current collecting member 24 provided by some embodiments of the present application. FIG. 6 is a structural schematic diagram of a first connecting body 241 provided by some embodiments of the present application. FIG. 7 is a partial sectional view of the battery cell 20 provided by some embodiments of the present application. The embodiments of the present application provide a battery cell 20, which includes an outer shell 21, an electrode assembly 22, a pressure relief mechanism 23, and a current collecting member 24. The outer shell 21 has a wall portion 213, the electrode assembly 22 is accommodated in the outer shell 21, the pressure relief mechanism 23 is arranged on the wall portion 213, and the current collecting member 24 is located between the electrode assembly 22 and the pressure relief mechanism 23. The current collecting member 24 includes a first connecting body 241 and a second connecting body 242 connected to each other, one of the first connecting body 241 and the second connecting body 242 is connected to the electrode assembly 22, and the other is connected to the outer shell 21. The first connecting body 241 is provided with an exhaust hole 2411. In the thickness direction of the wall portion 213, the projection of the second connecting body 242 is at least partially located in the exhaust hole 2411. The exhaust hole 2411 includes a first area covered by the second connecting body 242 and a second area 243 not covered by the second connecting body 242. The second area 243 is used to guide the discharge of the battery cell 20 to the pressure relief mechanism 23.

[0123] The battery cell 20 refers to the smallest unit that constitutes the battery device 100.

[0124] The housing 21 includes an end cap 212 and a casing 211 having an open-ended accommodation space for accommodating the electrode assembly 22. The end cap 212 is coupled to the casing 211 and closes the opening.

[0125] The end cap 212 refers to a member that covers the opening of the casing 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 212 can be adapted to the shape of the casing 211 to fit the casing 211. Alternatively, the end cap 212 can be made of a material having a certain degree of hardness and strength, such as an aluminum alloy, so that the end cap 212 is less likely to deform when subjected to a pressing impact, allowing the battery cell 20 to have a higher structural strength and improved reliability. The material of the end cap 212 can include, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The battery cell 20 further includes a lower plastic disposed on the inner side of the end cap 212, which can be used to isolate the electrical connection members within the casing 211 from the end cap 212 to reduce the risk of short circuit. For example, the lower plastic can be plastic, rubber, etc.

[0126] The casing 211 is a member for fitting the end cap 212 to form the internal environment of the battery cell 20, in which the formed internal environment can be used to accommodate the electrode assembly 22, the electrolyte, and other components. The casing 211 and the end cap 212 can be separate members, and an opening can be provided on the casing 211, and the end cap 212 is made to cover the opening to form the internal environment of the battery cell 20. Without limitation, the end cap 212 and the casing 211 can also be integrated, specifically, the end cap 212 and the casing 211 can first form a common joint surface before other components enter the casing, and then the end cap 212 is made to cover the casing 211 when it is necessary to seal the inside of the casing 211. The casing 211 can be various shapes and sizes, such as a rectangular parallelepiped, a cylinder, a hexagonal prism, etc. Specifically, the shape of the casing 211 can be determined according to the specific shape and size of the electrode assembly 22. The material of the casing 211 can include, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0127] The electrode assembly 22 is a member in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 22 can be contained in the casing 211. The electrode assembly 22 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and generally has a separator film disposed between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a portion with active material constituting a main body 221 of the electrode assembly 22, and a portion without active material constituting a tab 222, respectively. The positive tab and the negative tab can be located together at one end of the main body 221 or at both ends of the main body 221, respectively. During the charging and discharging of the battery device 100, the positive active material and the negative active material react with the electrolyte.

[0128] The battery cell 20 can further include an electrode terminal 25 insulatedly mounted on the shell 21 and electrically connected with the electrode assembly 22 to output or input the electric energy of the battery cell 20. It should be noted that the electrode terminal 25 is insulatedly mounted on the shell 21, that is, no electrical connection is formed between the electrode terminal 25 and the shell 21. Exemplarily, the material of the electrode terminal 25 can also be various, such as copper, iron, aluminum, steel or aluminum alloy, etc.

[0129] The pressure relief mechanism 23 is a component for opening when the internal pressure or temperature of the battery cell 20 reaches the detonation pressure to release the internal pressure of the battery cell 20. The pressure relief mechanism 23 is arranged on the wall portion 213. The pressure relief mechanism 23 can be a component mounted on the wall portion 213, at this time, the pressure relief mechanism 23 is arranged separately from and connected with the wall portion 213. For example, the pressure relief mechanism 23 is a rupture disc mounted on the wall portion 213. The pressure relief mechanism 23 can also be a part of the wall portion 213, at this time, the pressure relief mechanism 23 is integrally formed with the wall portion 213.

[0130] The wall of the shell 21 which is the wall portion 213 can be determined by the arrangement position of the pressure relief mechanism 23. For example, when the pressure relief mechanism 23 is arranged on the end cover 212, the end cover 212 is the wall portion 213. When the pressure relief mechanism 23 is arranged on the bottom wall 2112 of the shell 211, the bottom wall 2112 is the wall portion 213. When the pressure relief mechanism 23 is arranged on the side wall 2111 of the shell 211, the side wall 2111 is the wall portion 213.

[0131] The current collecting member 24 is located between the electrode assembly 22 and the pressure relief mechanism 23, and is used to connect the electrode assembly 22 and the shell 21 to output or input the electric energy of the battery cell 20 by the shell 21. Optionally, the current collecting member 24 connects the shell 21 and the tabs 222 with the same polarity in the plurality of electrode assemblies 22 to realize the electrical connection between the shell 21 and the plurality of electrode assemblies 22, which is conducive to reducing the assembly difficulty between the tabs 222 and the shell 21. Exemplarily, the material of the current collecting member 24 can also be various, such as copper, iron, aluminum, steel or aluminum alloy, etc.

[0132] The current collecting member 24 includes a first connecting body 241 and a second connecting body 242 connected with each other, one of the first connecting body 241 and the second connecting body 242 is used to connect with the electrode assembly 22, and the other of the first connecting body 241 and the second connecting body 242 is used to connect with the shell 21. For example, when the first connecting body 241 is used to connect with the electrode assembly 22, the second connecting body 242 is used to connect with the shell 21. When the first connecting body 241 is used to connect with the shell 21, the second connecting body 242 is used to connect with the electrode assembly 22.

[0133] Please refer to FIG. 4, FIG. 5 and FIG. 7, the thickness direction of the wall portion 213 is the X direction shown in the figure.

[0134] The first connecting body 241 is provided with an exhaust hole 2411, which is a through hole provided in the first connecting body 241. The exhaust hole 2411 penetrates the first connecting body 241 along the thickness direction of the wall portion 213.

[0135] The second connecting body 242 is connected to the first connecting body 241, and the projection of the second connecting body 242 along the thickness direction of the wall portion 213 is at least partially located in the exhaust hole 2411.

[0136] The exhaust hole 2411 includes a first area and a second area 243, wherein the first area is the area of the exhaust hole 2411 covered by the second connecting body 242, and the second area 243 is the area of the exhaust hole 2411 not covered by the second connecting body 242. In this way, when the battery monomer 20 is depressurized, the exhaust in the battery monomer 20 can flow to the pressure relief mechanism 23 through the second area 243, and be discharged from the pressure relief mechanism 23 to the battery monomer 20 to achieve pressure relief, reducing the risk of explosion and fire of the battery monomer 20.

[0137] The first connecting body 241 of the current collecting member 24 is provided with an exhaust hole 2411, which has a second area 243 not covered by the second connecting body 242, so that the exhaust in the battery monomer 20 can flow to the pressure relief mechanism 23 through the second area 243, facilitating the rapid pressure relief of the battery monomer 20, reducing the risk of pressure build-up of the battery monomer 20, and being beneficial to improve the reliability of the battery monomer 20.

[0138] Please refer to FIG. 3, FIG. 4, FIG. 5, FIG. 6 and FIG. 7, in some embodiments, the second connecting body 242 includes a plurality of first connecting portions 2421, and the projection of the first connecting portion 2421 along the thickness direction of the wall portion 213 is located in the exhaust hole 2411. The plurality of first connecting portions 2421 are spaced apart along the circumferential direction of the exhaust hole 2411 and provided in the first connecting body 241.

[0139] The exhaust hole 2411 can be a circular hole, and the circumferential direction of the exhaust hole 2411 is the circumferential direction of the exhaust hole 2411. Please refer to FIG. 5 and FIG. 6, the circumferential direction of the exhaust hole 2411 is the Y direction shown in the figure.

[0140] The second connecting body 242 can include two first connecting portions 2421, three first connecting portions 2421, four first connecting portions 2421 or more first connecting portions 2421. The plurality of first connecting portions 2421 are spaced apart along the circumferential direction of the exhaust hole 2411 and provided in the first connecting body 241.

[0141] It should be noted that the projection of the first connecting portion 2421 along the thickness direction of the wall portion 213 is located within the exhaust hole 2411.

[0142] The shape of the first connecting portion 2421 is not limited, for example, the shape of the first connecting portion 2421 can be strip-shaped, fan-shaped, triangular, etc.

[0143] By arranging multiple first connecting portions 2421, on the one hand, the multiple first connecting portions 2421 are all connected with the wall portion 213 or the electrode assembly 22, which is conducive to increasing the flow area. On the other hand, by arranging the multiple first connecting portions 2421 along the circumferential direction of the exhaust hole 2411 on the first connecting body 241, the exhaust in the battery monomer 20 can flow to the pressure relief mechanism 23 through the area between adjacent two first connecting portions 2421, which is conducive to the rapid pressure relief of the battery monomer 20 and improves the reliability of the battery monomer 20.

[0144] Please refer to FIG. 3, FIG. 4, FIG. 5, FIG. 6 and FIG. 7, in some embodiments, the second area 243 includes a first hollow area 2431 and multiple second hollow areas 2432, the multiple first connecting portions 2421 are arranged around the first hollow area 2431, and the first hollow area 2431 is communicated with the second hollow area 2432. Adjacent two first connecting portions 2421 form a second hollow area 2432.

[0145] The second hollow area 2432 is an area in the second area 243 which is jointly defined by adjacent two first connecting portions 2421 and the first connecting body 241. The second area 243 includes multiple second hollow areas 2432, and the multiple second hollow areas 2432 are arranged along the circumferential direction of the exhaust hole 2411.

[0146] The multiple second hollow areas 2432 are arranged around the first hollow area 2431, and the first hollow area 2431 is an area defined by one end of the multiple first connecting portions 2421 away from the first connecting body 241. Please refer to FIG. 5, the first hollow area 2431 is an area defined by one end of the six first connecting portions 2421 away from the first connecting body 241. The center of the center hole 223 of the electrode assembly 22 can be taken as the center, and at least two midpoints of one end of the first connecting portions 2421 away from the first connecting body 241 are fitted to a virtual circle, and the area defined by the virtual circle is the first area.

[0147] Please refer to FIG. 5, the first hollow area 2431 and the multiple second hollow areas 2432 are communicated.

[0148] By connecting the first hollow area 2431 and the second hollow area 2432, the area of the second area 243 is increased, which is conducive to the exhaust in the battery monomer 20 passing through the current collecting member 24 to the pressure relief mechanism 23 quickly, achieving rapid pressure relief of the battery monomer 20, reducing the risk of pressure retention of the battery monomer 20, and improving the reliability of the battery monomer 20.

[0149] Please refer to FIG. 8, FIG. 9 and FIG. 10, FIG. 8 is an exploded view of the battery monomer 20 provided by some embodiments of the application. FIG. 9 is a structural schematic view of the current collecting member 24 provided by some embodiments of the application. FIG. 10 is a partial sectional view of the battery monomer 20 provided by some embodiments of the application. In some embodiments, the second connecting body 242 further comprises a second connecting portion 2422, and the projection of the second connecting portion 2422 in the thickness direction of the wall portion 213 is located in the exhaust hole 2411. The second connecting portion 2422 connects a plurality of first connecting portions 2421.

[0150] The second connecting portion 2422 is a component for connecting a plurality of first connecting portions 2421. The projection of the second connecting portion 2422 in the thickness direction of the wall portion 213 is located in the exhaust hole 2411.

[0151] The second connecting portion 2422 can be a ring structure, and the second connecting portion 2422 can also be a plate structure, for example, the second connecting portion 2422 is a disc structure.

[0152] By setting the second connecting portion 2422 to connect a plurality of first connecting portions 2421, the structural strength of the second connecting body 242 is increased, so that the first connecting portion 2421 is not easy to deform under external force, and the connection between the first connecting portion 2421 and the wall portion 213 or the electrode assembly 22 is stable and reliable.

[0153] Please refer to FIG. 8, FIG. 9 and FIG. 10, in some embodiments, the second area 243 comprises a first hollow area 2431 and a plurality of second hollow areas 2432, and a plurality of first connecting portions 2421 are arranged around the second connecting portion 2422. The first hollow area 2431 is located in the second connecting portion 2422. The second connecting portion 2422 separates the first hollow area 2431 and the second hollow area 2432, and a second hollow area 2432 is formed between two adjacent first connecting portions 2421.

[0154] Please refer to FIG. 9, in some embodiments, the second connecting portion 2422 is a ring structure, and the second connecting portion 2422 defines the first hollow area 2431. The second connecting portion 2422, two adjacent first connecting portions 2421 and the first connecting body 241 define a second hollow area 2432. A plurality of second hollow areas 2432 are arranged outside the first hollow area 2431.

[0155] The first hollowed-out area 2431 is located inside the second connecting portion 2422, the second hollowed-out area 2432 is located outside the second connecting portion 2422, and the second connecting portion 2422 separates the first hollowed-out area 2431 and the second hollowed-out area 2432, that is, the first hollowed-out area 2431 and the second hollowed-out area 2432 are not in communication with each other.

[0156] The first hollowed-out area 2431 is further arranged in the second connecting portion 2422, which is beneficial to increase the area of the second region 243, reduce the risk of pressure build-up of the battery monomer 20, and improve the reliability of the battery monomer 20.

[0157] In some embodiments, the second connecting portion 2422 is configured to be damaged when the battery monomer 20 is depressurized.

[0158] When the battery monomer 20 is depressurized, the second connecting portion 2422 can be damaged under the action of the internal pressure or the discharge of the battery monomer 20, so that the area of the second region 243 is larger when the battery monomer 20 is depressurized.

[0159] The second connecting portion 2422 is damaged when the battery monomer 20 is depressurized, so that the area of the second region 243 is larger when the battery monomer 20 is depressurized, thereby facilitating the discharge in the battery monomer 20 to quickly pass through the current collecting member 24 to the pressure relief mechanism 23, achieving rapid depressurization of the battery monomer 20, reducing the risk of pressure build-up of the battery monomer 20, and improving the reliability of the battery monomer 20.

[0160] Please refer to FIG. 8, FIG. 9 and FIG. 10, in some embodiments, the pressure relief mechanism 23 has a weak portion 231, and the pressure relief mechanism 23 is configured to split along at least a portion of the weak portion 231 when the battery monomer 20 is depressurized. The strength of the second connecting portion 2422 is lower than the strength of the weak portion 231.

[0161] The weak portion 231 plays a role in pressure relief, and is used to enable the pressure relief mechanism 23 to split along the weak portion 231 when the internal pressure or temperature of the battery monomer 20 reaches a predetermined value, so as to release the pressure inside the battery monomer 20. For example, the strength of the pressure relief mechanism 23 at the position of the weak portion 231 can be lower than the strength of the pressure relief mechanism 23 at other positions, so that the first weak portion 231 can split under the action of the internal pressure when the internal pressure or temperature of the battery monomer 20 reaches a predetermined value, so as to release the pressure inside the battery monomer 20.

[0162] The strength of the second connecting portion 2422 is lower than the strength of the weak portion 231, so that the second connecting portion 2422 can be damaged under the action of the internal pressure or the discharge of the battery monomer 20, so that the area of the second region 243 is larger when the battery monomer 20 is depressurized.

[0163] By making the strength of the second connecting portion 2422 lower than the strength of the weak portion 231, when the battery monomer 20 is depressurized, the second connecting portion 2422 is broken under the action of the discharge of the battery monomer 20, further increasing the area of the second region 243, thereby facilitating the discharge in the battery monomer 20 to quickly pass through the current collecting member 24 to the pressure relief mechanism 23, realizing the rapid depressurization of the battery monomer 20, reducing the risk of pressure retention of the battery monomer 20, and facilitating the improvement of the reliability of the battery monomer 20.

[0164] In some embodiments, the second connecting portion 2422 is an annular structure.

[0165] The second connecting portion 2422 can be a circular ring structure, the second connecting portion 2422 can also be an elliptical ring structure, and the second connecting portion 2422 can also be a polygonal structure.

[0166] When the second connecting portion 2422 is an annular structure, the discharge of the battery monomer 20 can flow to the pressure relief mechanism 23 through the inside of the annular structure, realizing the rapid depressurization of the battery monomer 20, reducing the risk of pressure retention of the battery monomer 20, and facilitating the improvement of the reliability of the battery monomer 20.

[0167] Please refer to FIG. 8, FIG. 9 and FIG. 10, in some embodiments, the electrode assembly 22 has a center hole 223. The projection of the hole wall surface of the center hole 223 is located in the first hollowed-out area 2431 along the thickness direction of the wall portion 213.

[0168] The electrode assembly 22 includes a positive electrode sheet, a separator and a negative electrode sheet, which are wound to form a winding structure. In the process of winding, the electrode assembly 22 naturally forms a center hole 223.

[0169] The area of the first hollowed-out area 2431 is greater than the area of the center hole 223, and the position of the first hollowed-out area 2431 corresponds to the position of the center hole 223. The projection of the contour of the first hollowed-out area 2431 is located on the outside of the hole wall surface of the center hole 223 along the thickness direction of the wall portion 213.

[0170] When the projection of the hole wall surface of the center hole 223 is located in the first hollowed-out area 2431, it means that the area of the first hollowed-out area 2431 is greater than the area of the center hole 223, thereby facilitating the discharge in the center hole 223 to flow to the pressure relief mechanism 23 through the first hollowed-out area 2431.

[0171] Please refer to FIG. 8, FIG. 9 and FIG. 10, in some embodiments, the electrode assembly 22 has a tab 222, and the first connecting portion 2421 is welded with the tab 222.

[0172] The first connecting part 2421 is welded with the tab 222, and the first connecting body 241 is connected with the wall part 213, so that the space can be reasonably utilized, the connection between the current collecting member 24 and the electrode assembly 22 and the wall part 213 is more stable, and the manufacturing is facilitated, and the manufacturing cost of the battery monomer 20 is reduced.

[0173] Please refer to FIG. 8, FIG. 9 and FIG. 10, in some embodiments, the first connecting part 2421 extends along the radial direction of the exhaust hole 2411.

[0174] The radial direction of the exhaust hole 2411 is the extending direction of the diameter of the exhaust hole 2411. Please refer to FIG. 10, the radial direction of the exhaust hole 2411 is the Z direction shown in the figure.

[0175] The first connecting part 2421 extends along the radial direction of the exhaust hole 2411, and the first connecting part 2421 can be a strip-shaped structure.

[0176] By extending the first connecting part 2421 along the radial direction of the exhaust hole 2411, the first connecting part 2421 is facilitated to be connected with the wall part 213 or the electrode assembly 22. Especially for cylindrical battery monomers, the first connecting part 2421 extends along the radial direction of the exhaust hole 2411, and can be electrically connected with the flattened tab 222.

[0177] Please refer to FIG. 8, FIG. 9 and FIG. 10, in some embodiments, the pressure relief mechanism 23 has a weak part 231, and the pressure relief mechanism 23 is configured to be cracked along at least a part of the weak part 231 when the battery monomer 20 is relieved. The weak part 231 defines a predetermined pressure relief area 233. The projection of the predetermined pressure relief area 233 in the thickness direction of the wall part 213 is located in the exhaust hole 2411.

[0178] The weak part 231 defines the predetermined pressure relief area 233, and when the battery monomer 20 is relieved, the weak part 231 cracks along the edge of the predetermined pressure relief area 233, so that the predetermined pressure relief area 233 can be opened to relieve pressure.

[0179] The weak part 231 can be a closed structure with the first end and the tail end connected, for example, a ring shape. At this time, the predetermined pressure relief area 233 is the area in the pressure relief mechanism 23 enclosed by the weak part 231. The weak part 231 can also be a non-closed structure with a gap between the first end and the tail end, for example, the weak part 231 can be C-shaped or U-shaped. The connecting line of the first end and the tail end of the weak part 231 is the first connecting line, and the predetermined pressure relief area 233 is the area in the pressure relief mechanism 23 enclosed by the first connecting line and the weak part 231.

[0180] The projection of the predetermined pressure relief area 233 in the thickness direction of the wall part 213 is located in the exhaust hole 2411. In other words, the first connecting body 241 is arranged outside the projection of the predetermined pressure relief area 233 in the thickness direction of the wall part 213.

[0181] By locating the projection of the predetermined pressure relief area 233 within the exhaust hole 2411, on the one hand, the position of the predetermined pressure relief area 233 corresponds to the position of the exhaust hole 2411, which can facilitate the exhaust of the battery monomer 20 to the pressure relief mechanism 23 through the current collecting member 24. On the other hand, the area of the exhaust hole 2411 is large, which can realize the rapid pressure relief of the battery monomer 20, reduce the risk of pressure retention of the battery monomer 20, and be beneficial to improve the reliability of the battery monomer 20.

[0182] Please refer to FIG. 8, FIG. 9 and FIG. 10, in some embodiments, the pressure relief mechanism 23 is provided with a pressure relief groove 232, and the pressure relief mechanism 23 forms a weak part 231 in the area provided with the pressure relief groove 232. The projection of the groove bottom surface of the pressure relief groove 232 is located within the exhaust hole 2411 along the thickness direction of the wall part 213.

[0183] The pressure relief mechanism 23 has an inner surface and an outer surface arranged oppositely in the thickness direction of the wall part 213. Among them, the inner surface faces the electrode assembly 22, and the outer surface faces away from the electrode assembly 22. The inner surface can be provided with the pressure relief groove 232, or the outer surface can be provided with the pressure relief groove 232. Taking the inner surface provided with the pressure relief groove 232 as an example, that is, the pressure relief groove 232 is recessed from the inner surface to the outer surface, and the weak part 231 is the part between the groove bottom surface of the pressure relief groove 232 and the outer surface.

[0184] The pressure relief groove 232 can be formed in various ways, such as stamping forming, cold heading forming, etc. Taking the way of stamping forming as an example, the pressure relief groove 232 can be formed on the pressure relief mechanism 23 along the thickness direction of the wall part 213.

[0185] The stamping forming or cold heading forming of the pressure relief groove 232 will cause the cold work hardening of the groove wall of the pressure relief groove 232 (the change of grain arrangement causes the distortion of crystal lattice, which reduces the plasticity of metal and improves the hardness of material), which enhances the ability to resist external impact and is not easy to be damaged by external impact. In this way, it is beneficial to reduce the risk of liquid leakage of the pressure relief mechanism 23.

[0186] The projection of the groove bottom surface of the pressure relief groove 232 along the thickness direction of the wall part 213 is located within the exhaust hole 2411.

[0187] When the projection of the groove bottom surface of the pressure relief groove 232 is located within the exhaust hole 2411, the area of the exhaust hole 2411 is larger, the pressure relief of the battery monomer 20 is more smooth, and it is beneficial to improve the timeliness of the pressure relief of the battery monomer 20.

[0188] Please refer to FIG. 8, FIG. 9 and FIG. 10. In some embodiments, the pressure relief mechanism 23 has a weak portion 231, and the pressure relief mechanism 23 is configured to split along at least a portion of the weak portion 231 when the battery cell 20 is relieved of pressure. The weak portion 231 defines a predetermined pressure relief area 233. A projection of the predetermined pressure relief area 233 along a thickness direction of the wall portion 213 is at least partially located within the second region 243.

[0189] By locating the projection of the predetermined pressure relief area 233 at least partially within the second region 243, i.e., at least a portion of the predetermined pressure relief area 233 corresponds to a location of the second region 243, it is convenient for the emission within the battery cell 20 to reach the pressure relief mechanism 23 through the current collecting member 24.

[0190] Please refer to FIG. 8, FIG. 9 and FIG. 10. In some embodiments, the pressure relief mechanism 23 has a weak portion 231, and the pressure relief mechanism 23 is configured to split along at least a portion of the weak portion 231 when the battery cell 20 is relieved of pressure, and the weak portion 231 defines a predetermined pressure relief area 233. An area of the second region 243 is greater than an area of the predetermined pressure relief area 233.

[0191] The area of the second region 243 can be represented by a projection area of an outline of the second region 243 along a thickness direction of the wall portion 213.

[0192] The area of the predetermined pressure relief area 233 can be represented by a projection area of the predetermined pressure relief area 233 along the thickness direction of the wall portion 213.

[0193] The projection area of the outline of the second region 243 along the thickness direction of the wall portion 213 is greater than the projection area of the predetermined pressure relief area 233 along the thickness direction of the wall portion 213.

[0194] By making the area of the second region 243 greater than the area of the predetermined pressure relief area 233, it is possible to achieve rapid pressure relief of the battery cell 20, reduce the risk of pressure build-up of the battery cell 20, and improve the reliability of the battery cell 20.

[0195] In some embodiments, the first connecting body 241 is directly connected to the wall portion 213, and the second connecting body 242 is connected to the electrode assembly 22.

[0196] The first connecting body 241 can be welded to the wall portion 213, and the second connecting body 242 can be welded to the tab 222 of the electrode assembly 22.

[0197] By connecting the first connecting body 241 to the wall portion 213 and connecting the second connecting body 242 to the electrode assembly 22, it is convenient to simplify the manufacturing process and reduce the manufacturing cost of the battery cell 20.

[0198] In some embodiments, the shell 21 comprises a side wall 2111 surrounding the wall portion 213 and connected to the wall portion 213. The first connecting body 241 is directly connected to the side wall 2111, and the second connecting body 242 is connected to the electrode assembly 22.

[0199] The side wall 2111 and the wall portion 213 can be integrally formed, and the side wall 2111 and the wall portion 213 constitute a housing 211. An end of the side wall 2111 away from the wall portion 213 forms an opening of the housing 211. The side wall 2111 and the wall portion 213 can also be separately provided, and the wall portion 213 is an end cover 212. An end of the side wall 2111 close to the wall portion 213 forms an opening of the housing 211.

[0200] When the battery cell 20 is a cylindrical battery cell, the side wall 2111 is in a cylindrical shape.

[0201] The first connecting body 241 can be welded to the side wall 2111, and the second connecting body 242 can be welded to the tab 222 of the electrode assembly 22.

[0202] By connecting the first connecting body 241 to the side wall 2111 and connecting the second connecting body 242 to the electrode assembly 22, on the one hand, the electrical energy of the electrode assembly 22 can be output or input to the electrode assembly 22 through the side wall 2111, which facilitates wiring of the battery cell 20 with other electrical connection components. On the other hand, it is beneficial to simplify the manufacturing and reduce the manufacturing cost of the battery cell 20.

[0203] Please refer to FIGS. 8, 9 and 10. In some embodiments, the pressure relief mechanism 23 is integrally formed with the wall portion 213.

[0204] Integrally formed means that the wall portion 213 and the pressure relief mechanism 23 are provided as an integral structure. For example, the pressure relief mechanism 23 can be formed on the wall portion 213 by stamping or cold heading.

[0205] Integrally forming the pressure relief mechanism 23 with the wall portion 213 eliminates the need for additional welding or bonding processes, which is beneficial to reduce the risk of liquid leakage of the pressure relief mechanism 23. Moreover, during production, it is easy to make the initiation pressure of the processed plurality of battery cells 20 more consistent.

[0206] In some other embodiments, the pressure relief mechanism 23 is separately provided from the wall portion 213. The wall portion 213 is provided with a pressure relief hole, and the pressure relief mechanism 23 is installed on the wall portion 213 and covers the pressure relief hole.

[0207] The "pressure relief mechanism 23 is provided separately from the wall portion 213, the wall portion 213 is provided with a pressure relief hole, and the pressure relief mechanism 23 is mounted on the wall portion 213 and covers the pressure relief hole" means that, in manufacturing, the pressure relief hole is formed on the wall portion 213, the pressure relief mechanism 23 and the wall portion 213 are provided separately, and finally connected together. For example, the pressure relief mechanism 23 can be welded to the wall portion 213. The pressure relief mechanism 23 can be a rupture disc mounted on the wall portion 213.

[0208] By providing the pressure relief mechanism 23 separately from the wall portion 213 and mounting the pressure relief mechanism 23 on the wall portion 213, the manufacturing process is facilitated.

[0209] In some embodiments, the battery cell 20 is a cylindrical battery cell.

[0210] When the battery cell 20 is a cylindrical battery cell, it is more advantageous to solve the problem of pressure retention, and the effect is better.

[0211] The embodiments of the present application also provide a battery device 100, which includes the battery cell 20 described above.

[0212] The embodiments of the present application also provide a battery device 100, which includes the battery cell 20 described above.

[0213] According to some embodiments of the present application, refer to FIGS. 3-10.

[0214] The embodiments of the present application provide a battery cell 20, which includes a shell 21, an electrode assembly 22, a pressure relief mechanism 23, and a current collecting member 24. The shell 21 has a wall portion 213, the electrode assembly 22 is contained in the shell 21, the pressure relief mechanism 23 is arranged on the wall portion 213, and the current collecting member 24 is located between the electrode assembly 22 and the pressure relief mechanism 23. The current collecting member 24 includes a first connecting body 241 and a second connecting body 242 connected to each other, one of the first connecting body 241 and the second connecting body 242 is connected to the electrode assembly 22, and the other is connected to the shell 21. The first connecting body 241 is provided with an exhaust hole 2411, and the projection of the second connecting body 242 is at least partially located in the exhaust hole 2411 along the thickness direction of the wall portion 213. The exhaust hole 2411 includes a first area covered by the second connecting body 242 and a second area 243 not covered by the second connecting body 242, and the second area 243 is used to guide the discharge in the battery cell 20 to the pressure relief mechanism 23. The first connecting body 241 of the current collecting member 24 is provided with the exhaust hole 2411, the exhaust hole 2411 has the second area 243 not covered by the second connecting body 242, so that the discharge in the battery cell 20 can flow to the pressure relief mechanism 23 through the second area 243, facilitating the rapid pressure relief of the battery cell 20, reducing the risk of pressure retention of the battery cell 20, and being advantageous to improve the reliability of the battery cell 20.

[0215] The second connecting body 242 includes a plurality of first connecting portions 2421, projections of the first connecting portions 2421 are located in the exhaust hole 2411 along the thickness direction of the wall portion 213, and the plurality of first connecting portions 2421 are arranged at the first connecting body 241 in a circumferential direction of the exhaust hole 2411. By arranging the plurality of first connecting portions 2421, on the one hand, the plurality of first connecting portions 2421 are connected with the wall portion 213 or the electrode assembly 22, which is conducive to increasing the flow area. On the other hand, by arranging the plurality of first connecting portions 2421 at the first connecting body 241 in the circumferential direction of the exhaust hole 2411, the exhaust in the battery monomer 20 can flow to the pressure relief mechanism 23 through the area between two adjacent first connecting portions 2421, which facilitates the rapid pressure relief of the battery monomer 20 and is conducive to improving the reliability of the battery monomer 20.

[0216] In some embodiments, the second region 243 includes a first hollow area 2431 and a plurality of second hollow areas 2432, the plurality of first connecting portions 2421 are arranged around the first hollow area 2431, and the first hollow area 2431 is communicated with the second hollow area 2432. One second hollow area 2432 is formed between two adjacent first connecting portions 2421. By communicating the first hollow area 2431 and the second hollow area 2432, the area of the second region 243 is increased, which is conducive to the exhaust in the battery monomer 20 quickly passing through the current collecting member 24 to the pressure relief mechanism 23, achieving the rapid pressure relief of the battery monomer 20, reducing the risk of pressure retention of the battery monomer 20, and improving the reliability of the battery monomer 20.

[0217] In other embodiments, the second connecting body 242 further includes a second connecting portion 2422, a projection of the second connecting portion 2422 is located in the exhaust hole 2411 along the thickness direction of the wall portion 213, and the second connecting portion 2422 connects the plurality of first connecting portions 2421. By arranging the second connecting portion 2422 to connect the plurality of first connecting portions 2421, the structural strength of the second connecting body 242 is increased, so that the first connecting portion 2421 is not easy to deform under external force, and the connection between the first connecting portion 2421 and the wall portion 213 or the electrode assembly 22 is stable and reliable.

[0218] The second region 243 includes a first hollow area 2431 and a plurality of second hollow areas 2432, the plurality of first connecting portions 2421 are arranged around the second connecting portion 2422, the first hollow area 2431 is located in the second connecting portion 2422, and the second connecting portion 2422 separates the first hollow area 2431 and the second hollow area 2432. One second hollow area 2432 is formed between two adjacent first connecting portions 2421. The first hollow area 2431 is also arranged in the second connecting portion 2422, which is conducive to increasing the area of the second region 243, reducing the risk of pressure retention of the battery monomer 20, and improving the reliability of the battery monomer 20.

[0219] The second connecting portion 2422 is configured to be broken when the battery monomer 20 is pressure released. The second connecting portion 2422 is broken when the battery monomer 20 is pressure released, so that the area of the second region 243 is larger when the battery monomer 20 is pressure released, thereby facilitating the exhaust in the battery monomer 20 to pass through the current collecting member 24 to the pressure release mechanism 23, achieving fast pressure release of the battery monomer 20, reducing the risk of pressure retention of the battery monomer 20, and facilitating improvement of the reliability of the battery monomer 20.

[0220] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Various modifications and changes can be made by those skilled in the art based on the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, wherein, The application relates to a battery cell, comprising: a housing having a wall portion; an electrode assembly accommodated in the housing; a pressure relief mechanism arranged on the wall portion; a current collecting member located between the electrode assembly and the pressure relief mechanism; the current collecting member comprises a first connecting body and a second connecting body connected to each other, one of the first connecting body and the second connecting body is connected to the electrode assembly, and the other is connected to the housing, the first connecting body is provided with an exhaust hole, and a projection of the second connecting body is at least partially located in the exhaust hole in the thickness direction of the wall portion, the exhaust hole comprises a first area covered by the second connecting body and a second area not covered by the second connecting body, and the second area is used for guiding the exhaust of the battery cell to the pressure relief mechanism.

2. The battery cell of claim 1, wherein, The second connecting body comprises a plurality of first connecting portions, and a projection of the first connecting portion is located in the exhaust hole in the thickness direction of the wall portion, and a plurality of the first connecting portions are arranged on the first connecting body in the circumferential direction of the exhaust hole.

3. The battery cell of claim 2, wherein, The second area comprises a first hollow area and a plurality of second hollow areas, a plurality of the first connecting portions are arranged around the first hollow area, the first hollow area is communicated with the second hollow area, and one second hollow area is formed between two adjacent first connecting portions.

4. The battery cell of claim 2, wherein, The second connecting body further comprises a second connecting portion, a projection of the second connecting portion is located in the exhaust hole in the thickness direction of the wall portion, and the second connecting portion connects a plurality of the first connecting portions.

5. The battery cell of claim 4, wherein, The second area comprises a first hollow area and a plurality of second hollow areas, a plurality of the first connecting portions are arranged around the second connecting portion, the first hollow area is located in the second connecting portion, and the second connecting portion separates the first hollow area and the second hollow area, and one second hollow area is formed between two adjacent first connecting portions.

6. The battery cell of claim 4 or 5, wherein, The second connecting portion is configured to be damaged when the battery cell is relieved.

7. The battery cell of any one of claims 4-6, wherein, The second connecting portion is in the form of a ring structure.

8. The battery cell of claim 3 or 5, wherein, The electrode assembly has a central hole, and a projection of a hole wall surface of the central hole is located in the first hollow area in the thickness direction of the wall portion.

9. The battery cell of any one of claims 2-8, wherein, The electrode assembly has a tab, and the first connecting portion is welded to the tab.

10. The battery cell of any one of claims 2-9, wherein, The first connecting portion extends in the radial direction of the exhaust hole.

11. The battery cell of any one of claims 1-10, wherein, The pressure relief mechanism has a weak portion, and the pressure relief mechanism is configured to split along at least part of the weak portion when the battery cell is relieved, and the weak portion defines a predetermined pressure relief area; a projection of the predetermined pressure relief area is located in the exhaust hole in the thickness direction of the wall portion.

12. The battery cell of claim 11, wherein, The pressure relief mechanism is provided with a pressure relief groove, and the pressure relief mechanism forms the weak portion in the area provided with the pressure relief groove; a projection of a groove bottom surface of the pressure relief groove is located in the exhaust hole in the thickness direction of the wall portion.

13. The battery cell of any one of claims 1-12, wherein, The pressure relief mechanism has a weak portion, and the pressure relief mechanism is configured to split along at least part of the weak portion when the battery cell is relieved, and the weak portion defines a predetermined pressure relief area; a projection of the predetermined pressure relief area is at least partially located in the second area in the thickness direction of the wall portion.

14. The battery cell of any one of claims 1-13, wherein, The pressure relief mechanism has a weak portion configured to split along at least a portion of the weak portion when the battery cell is relieved of pressure, the weak portion defining a predetermined pressure relief area; The second area is larger than the predetermined pressure relief area.

15. The battery cell of any one of claims 1-14, wherein, The first connecting body is directly connected to the wall portion, and the second connecting body is connected to the electrode assembly.

16. The battery cell of any one of claims 1-15, wherein, The housing includes a side wall surrounding the wall portion and connected to the wall portion. The first connecting body is directly connected to the side wall, and the second connecting body is connected to the electrode assembly.

17. The battery cell of any one of claims 1-16, wherein, The pressure relief mechanism is integrally formed with the wall portion.

18. The battery cell of any one of claims 1-16, wherein, The pressure relief mechanism is separately provided from the wall portion, the wall portion is provided with a pressure relief hole, and the pressure relief mechanism is mounted to the wall portion and covers the pressure relief hole.

19. The battery cell of any one of claims 1-18, wherein, The battery cell is a cylindrical battery cell.

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

21. An electrical device, comprising: A battery cell according to any one of claims 1-19, for providing electric energy to the electric device.

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