Battery monomer, battery device and electric device

Abstract

The utility model provides a battery cell, a battery device and a power utilization device. The battery monomer comprises an electrode assembly and a first electrode lead-out part, the electrode assembly comprises a plurality of first pole piece parts with the same polarity, the plurality of first pole piece parts are stacked, and the first pole piece parts are provided with sub-tabs. The electrode assembly is provided with a plurality of first tabs, each first tab is formed by stacking a plurality of sub tabs, and the number of the sub tabs in each first tab is smaller than that of the first pole piece parts. And the plurality of first tabs are electrically connected with the first electrode leading-out part. The electrode assembly is provided with a plurality of first tabs with the same polarity, each first tab is formed by stacking a plurality of sub tabs, and the number of the sub tabs in each first tab is smaller than that of the first pole piece parts, so that the thickness of a single first tab is reduced, the power required for connecting the first tabs and the first electrode lead-out parts is reduced, and the reliability of the electrode assembly is improved. Therefore, the connection of the first tab and the first electrode lead-out part is more convenient, other parts are not easy to influence, and the improvement of the reliability of the single battery is facilitated.

Description

TECHNICAL FIELD

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

[0002] Batteries are widely used in the field of new energy, for example, electric vehicles, new energy vehicles, etc. New energy vehicles and electric vehicles have become a new trend in the development of the automobile industry. The development of battery technology needs to consider various design factors, such as 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. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the embodiments of the present application is to provide a battery monomer, a battery device and a power consumption device, which aims to improve the problem of poor reliability of the battery in the related art.

[0004] In a first aspect, the embodiments of the present application provide a battery monomer, which comprises an electrode assembly and a first electrode lead-out portion, the electrode assembly comprises a plurality of first pole piece portions with the same polarity, the plurality of first pole piece portions are stacked, and the first pole piece portion has a sub-pole lug; the electrode assembly has a plurality of first lugs, each first lug is formed by stacking a plurality of sub-pole lugs, and the number of sub-pole lugs in each first lug is less than the number of first pole piece portions; and the plurality of first lugs are electrically connected to the first electrode lead-out portion.

[0005] In the above technical solution, the electrode assembly of the battery monomer has a plurality of first lugs with the same polarity, each first lug is formed by stacking a plurality of sub-pole lugs, and the number of sub-pole lugs in each first lug is less than the number of first pole piece portions, which is beneficial to reduce the thickness of a single first lug, reduce the power required for connecting the first lug and the first electrode lead-out portion, make the connection of the first lug and the first electrode lead-out portion more convenient, and not easily affect or damage other components, thereby improving the reliability of the battery monomer.

[0006] As an optional technical solution of the embodiments of the present application, the sum of the number of sub-pole lugs of the plurality of first lugs is equal to the number of first pole piece portions.

[0007] In the above technical solution, by making the sum of the number of sub-pole lugs of the plurality of first lugs equal to the number of first pole piece portions, each first pole piece portion has only one sub-pole lug, which is simple and convenient in manufacturing, and is beneficial to reduce the manufacturing cost of the battery monomer.

[0008] As an optional technical solution of the embodiments of the present application, each first pole piece portion has only one sub-pole lug.

[0009] In the technical solution, each first tab part has only one sub-tab, which is simple and convenient in manufacturing and helps reduce the manufacturing cost of the battery cell.

[0010] As an optional technical solution of the embodiment, the sub-tabs of the adjacent first tab parts are stacked to form the first tab.

[0011] In the technical solution, the sub-tabs of the adjacent first tab parts are stacked to form the first tab, which is simple in stacking the first tab parts, reduces the manufacturing difficulty, improves the manufacturing efficiency, and helps reduce the manufacturing cost of the battery cell.

[0012] As an optional technical solution of the embodiment, in the first tab, the first tab parts corresponding to the adjacent two sub-tabs are separated by at least one first tab part.

[0013] In the technical solution, in one first tab, the first tab parts corresponding to the adjacent two sub-tabs are separated by at least one first tab part, which helps make the positions of the two first tabs close in the stacking direction of the first tab parts, thereby facilitating the connection with the first electrode lead-out part.

[0014] As an optional technical solution of the embodiment, the first tabs are located at the same end of the electrode assembly along a first direction, and the first tabs are spaced apart along a second direction, and the first direction and the second direction are perpendicular.

[0015] In the technical solution, the first tabs are located at the same end of the electrode assembly along a first direction, which facilitates the connection of the first tabs with the same first electrode lead-out part. By spacing the first tabs along a second direction, the risk of interference between the adjacent two first tabs when the stacked sub-tabs are misaligned is reduced.

[0016] As an optional technical solution of the embodiment, along the second direction, the minimum distance between the adjacent two first tabs is A, which satisfies: 2mm≤A≤8mm.

[0017] In the technical solution, when A is greater than or equal to 2 mm, the minimum distance between the two adjacent first tabs in the second direction is relatively large, which is beneficial to reduce the risk of mutual interference of the two adjacent first tabs when the plurality of stacked sub-tabs are misaligned. When A is less than or equal to 8 mm, the minimum distance between the two adjacent first tabs in the second direction is not too large, on the one hand, which is beneficial to make the width of a single first tab larger, thereby facilitating the connection with the first electrode lead-out part. On the other hand, it is beneficial to reduce the size of the first electrode lead-out part, reduce the risk of interference between the first electrode lead-out part and other components, and improve the reliability of the battery monomer. In addition, after connecting one first tab with the first electrode lead-out part, the connecting equipment can be quickly transferred to the position of another first tab, which is beneficial to reduce the migration path of the connecting equipment, shorten the manufacturing time, improve the manufacturing efficiency, and reduce the manufacturing cost of the battery monomer. Therefore, when 2 mm≤A≤8 mm, the reliability and manufacturing cost of the battery monomer can be considered.

[0018] As an optional technical solution of the embodiment of the application, 2 mm≤A≤6 mm.

[0019] In the technical solution, when A is greater than or equal to 2 mm, the minimum distance between the two adjacent first tabs in the second direction is relatively large, which is beneficial to reduce the risk of mutual interference of the two adjacent first tabs when the plurality of stacked sub-tabs are misaligned. When A is less than or equal to 6 mm, the minimum distance between the two adjacent first tabs in the second direction is not too large, on the one hand, which is beneficial to make the width of a single first tab larger, thereby facilitating the connection with the first electrode lead-out part. On the other hand, it is beneficial to further reduce the size of the first electrode lead-out part, reduce the risk of interference between the first electrode lead-out part and other components, and improve the reliability of the battery monomer. In addition, after connecting one first tab with the first electrode lead-out part, the connecting equipment can be quickly transferred to the position of another first tab, which is beneficial to reduce the migration path of the connecting equipment, shorten the manufacturing time, improve the manufacturing efficiency, and further reduce the manufacturing cost of the battery monomer. Therefore, when 2 mm≤A≤6 mm, the reliability and manufacturing cost of the battery monomer can be considered.

[0020] As an optional technical solution of the embodiment of the application, the battery monomer comprises a shell and an electrode terminal, the electrode assembly is contained in the shell, and the electrode terminal is arranged on the shell. The electrode terminal is the first electrode lead-out part.

[0021] In the technical solution, the electrode terminal is the first electrode lead-out part, and the electrical energy of the electrode assembly is output or input to the electrode assembly through the electrode terminal, which has high reliability.

[0022] As an optional technical solution of the embodiment of the application, the plurality of first tabs are all welded to the electrode terminal.

[0023] In the technical solution, the plurality of first tabs and the electrode terminal are welded to be connected, on the one hand, the welding process is relatively simple, which is conducive to reducing the manufacturing cost. On the other hand, the connection strength between the first tab and the electrode terminal is high, so that the connection between the first tab and the electrode terminal is not easy to fail, which is conducive to improving the reliability of the battery monomer.

[0024] As an optional technical solution of the embodiment of the application, the plurality of first tabs are arranged at intervals along a second direction, and the first tabs and the electrode terminal are welded to form a welding portion; along the second direction, the length of the welding portion is L, and 5mm≤L≤15mm is satisfied.

[0025] In the technical solution, when L≥5mm, the length of the welding portion along the second direction is large, and the connection strength between the first tab and the electrode terminal is high, so that the connection between the first tab and the electrode terminal is not easy to fail, which is conducive to improving the reliability of the battery monomer. When L≤15mm, the length of the welding portion along the second direction is not too large, so that the welding time is shortened, the production efficiency is improved, and the manufacturing cost of the battery monomer is reduced under the condition that the first tab and the electrode terminal have high connection strength. Moreover, it is also conducive to controlling the welding heat, reducing the risk of deformation of the first tab and / or the electrode terminal, reducing the risk of burning and melting of other components, and improving the reliability of the battery monomer. Therefore, when 5mm≤L≤15mm, the reliability and the manufacturing cost of the battery monomer can be considered.

[0026] As an optional technical solution of the embodiment of the application, 8mm≤L≤12mm.

[0027] In the technical solution, when L≥8mm, the length of the welding portion along the second direction is larger, and the connection strength between the first tab and the electrode terminal is higher, so that the connection between the first tab and the electrode terminal is more not easy to fail, which is more conducive to improving the reliability of the battery monomer. When L≤12mm, the length of the welding portion along the second direction is not too large, so that the welding time is shortened, the production efficiency is improved, and the manufacturing cost of the battery monomer is reduced under the condition that the first tab and the electrode terminal have high connection strength. Moreover, it is also conducive to controlling the welding heat, reducing the risk of deformation of the first tab and / or the electrode terminal, reducing the risk of burning and melting of other components, and improving the reliability of the battery monomer. Therefore, when 8mm≤L≤12mm, the reliability and the manufacturing cost of the battery monomer can be considered.

[0028] As an optional technical solution of the embodiment of the application, the electrode assembly has N first tabs, and the minimum distance between two adjacent first tabs in the second direction is A; the maximum size of the electrode terminal in the second direction is B; each first tab is connected to the electrode terminal through a welding part, and the following condition is met: ((N-1) * A + N * L + 4N) mm <= B <= ((N-1) * A + N * L + 16N) mm.

[0029] In the above technical solution, when B >= ((N-1) * A + N * L + 4N) mm, the maximum size of the electrode terminal in the second direction is large, which on the one hand is conducive to increasing the connection area of the first tab and the electrode terminal and improving the overcurrent capacity. On the other hand, it is convenient to connect the first tab to the electrode terminal, which is conducive to reducing the risk of damaging other components during the connection process. When B <= ((N-1) * A + N * L + 16N) mm, the maximum size of the electrode terminal in the second direction is not too large, which is conducive to reducing the risk of interference between the electrode terminal and other components and improving the reliability of the battery monomer. Therefore, when ((N-1) * A + N * L + 4N) mm <= B <= ((N-1) * A + N * L + 16N) mm, the overcurrent capacity and the reliability of the battery monomer can be considered.

[0030] As an optional technical solution of the embodiment of the application, the plurality of first tabs are arranged at intervals in the second direction; the maximum size of the electrode terminal in the second direction is B, and the maximum size of the shell is C, and the following condition is met: 0.25 <= B / C <= 0.6.

[0031] In the above technical solution, when B / C >= 0.25, the maximum size of the electrode terminal in the second direction is large, which on the one hand is conducive to increasing the connection area of the first tab and the electrode terminal and improving the overcurrent capacity. On the other hand, it is convenient to connect the first tab to the electrode terminal, which is conducive to reducing the risk of damaging other components during the connection process. When B / C <= 0.6, the maximum size of the electrode terminal in the second direction is not too large, which is conducive to reducing the risk of interference between the electrode terminal and other components and improving the reliability of the battery monomer. Therefore, when 0.25 <= B / C <= 0.6, the overcurrent capacity and the reliability of the battery monomer can be considered.

[0032] As an optional technical solution of the embodiment of the application, 0.25 <= B / C <= 0.5.

[0033] In the technical solution, when B / C is greater than or equal to 0.25, the maximum dimension of the electrode terminal along the second direction is relatively large, on the one hand, which is beneficial to increase the connection area of the first tab and the electrode terminal and improve the overcurrent capacity. On the other hand, it is convenient to connect the first tab to the electrode terminal, and it is beneficial to reduce the risk of damaging other components in the connection process. When B / C is less than or equal to 0.5, the maximum dimension of the electrode terminal along the second direction is not too large, which is more beneficial to reduce the risk of interference between the electrode terminal and other components, and is beneficial to improve the reliability of the battery monomer. Therefore, when 0.25≤B / C≤0.6, the overcurrent capacity and the reliability of the battery monomer can be considered at the same time.

[0034] As an optional technical solution of the embodiment of the application, the battery monomer comprises a shell, the electrode assembly is accommodated in the shell, and the first electrode lead-out part is a wall part of the shell.

[0035] In the technical solution, the first electrode lead-out part is a wall part of the shell, the electric energy of the electrode assembly can be output or input to the electrode assembly through a wall part of the shell, the number of electrode terminals can be reduced, the occupation of the electrode terminals to the internal space of the battery monomer can be reduced, and the energy density of the battery monomer can be improved.

[0036] As an optional technical solution of the embodiment of the application, the electrode assembly is a laminated structure, the electrode assembly comprises a plurality of first tabs and a plurality of second tabs, the polarities of the first tabs and the second tabs are opposite, and the first tabs are the first tab parts.

[0037] In the technical solution, when the electrode assembly is a laminated structure, the electrode assembly comprises a plurality of first tabs and a plurality of second tabs, the polarities of the plurality of first tabs and the plurality of second tabs are opposite and the plurality of first tabs and the plurality of second tabs are stacked, and each first tab can be used as a first tab part.

[0038] As an optional technical solution of the embodiment of the application, the electrode assembly is a wound structure, the electrode assembly comprises a first tab and a second tab, the polarities of the first tab and the second tab are opposite, and the first tab comprises a plurality of first tab parts.

[0039] In the technical solution, when the electrode assembly is a wound structure, the electrode assembly comprises a first tab and a second tab, the polarities of the first tab and the second tab are opposite and the first tab and the second tab are wound, and each first tab comprises a plurality of first tab parts.

[0040] In a second aspect, the embodiment of the application further provides a battery device, which comprises the battery monomer.

[0041] Thirdly, embodiments of this application also provide an electrical device, which includes the aforementioned battery cell, and the battery cell is used to provide electrical energy to the electrical device. Attached Figure Description

[0042] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0044] Figure 2 Exploded views of battery devices provided in some embodiments of this application;

[0045] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0046] Figure 4 Exploded views of a single battery cell provided in some embodiments of this application;

[0047] Figure 5 This is a schematic diagram of the structure of an electrode assembly provided in some embodiments of this application;

[0048] Figure 6 A front view schematic diagram of an electrode assembly provided in some embodiments of this application;

[0049] Figure 7 for Figure 6 A cross-sectional view at position AA in the middle;

[0050] Figure 8 for Figure 6 A cross-sectional view at position BB in the middle;

[0051] Figure 9 A cross-sectional view of an electrode assembly provided for some embodiments of this application, taken through a first tab;

[0052] Figure 10 A cross-sectional view of an electrode assembly provided for some embodiments of this application, taken through a section of another first electrode tab;

[0053] Figure 11 This is a schematic diagram of the connection between the first electrode tab and the electrode terminal provided in some embodiments of this application;

[0054] Figure 12 This is a schematic diagram of the structure of an electrode assembly provided in some other embodiments of this application.

[0055] Icon: 10 - box body; 11 - first box body; 12 - second box body; 20 - battery cell; 21 - case; 211 - case body; 212 - end cover; 22 - electrode assembly; 221 - main body part; 2211 - first tab; 2212 - second tab; 2213 - first tab part; 2214 - spacer; 2215 - flat area; 2216 - bending area; 222 - positive electrode tab; 2221 - sub tab; 223 - negative electrode tab; 224 - first electrode tab; 225 - welding part; 23 - first electrode lead-out part; 231 - electrode terminal; 24 - insulating member; 100 - battery device; 200 - controller; 300 - motor; 1000 - vehicle. DETAILED DESCRIPTION

[0056] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0057] 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, rather than to describe a particular order or primary and secondary relationship.

[0058] 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 appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments.

[0059] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] The term "and / or", in the present application, is only used to describe the relationship of associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the following three cases: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0061] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device, are only exemplary and should not constitute any limitation on the present application.

[0062] "Multiple" appearing in the present application means two or more (including two).

[0063] 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.

[0064] The battery cell includes, but is not limited to, a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0065] 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 reduce the risk of short circuit of the positive and negative electrodes, and at the same time allow the active ions to pass through.

[0066] In some embodiments, the positive electrode can be a positive electrode sheet, 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.

[0067] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction of itself, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0068] As an example, the positive electrode current collector can employ a metal foil or a composite current collector. For example, as a 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).

[0069] 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 positive electrode active material of a battery cell can also be used. These positive electrode active materials can be used alone only one or two or more can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (which can also be referred to simply as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium 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, at least one of lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3Mn 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 0.05 O2), and a modified compound thereof, or the like.

[0070] 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 positive electrode active material, or can be provided with 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 lithium-rich material.

[0071] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0072] As an example, the negative electrode current collector can employ a metal foil, foamed metal, or composite current collector. For example, as the metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. can be employed. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. The composite current collector can include a high 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 high polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0073] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0074] 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.

[0075] 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, silicon-based material, tin-based material, lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative electrode active material for a battery cell can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0076] 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.

[0077] In some embodiments, the separator is a separator film. The separator film can be any porous structure separator film known to have good chemical stability and mechanical stability.

[0078] 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 between the positive and negative electrodes or can be attached to the surface of the positive and negative electrodes.

[0079] 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.

[0080] 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 difluorobisoxalate borate, lithium bisoxalate borate, lithium difluorobisoxalate phosphate, and lithium tetrafluorobisoxalate phosphate.

[0081] 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.

[0082] Among them, the gel electrolyte includes a polymer as a skeleton network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0083] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0084] In some embodiments, the electrode assembly is a stacked structure.

[0085] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0086] As an example, the positive electrode sheet can be provided in a plurality of pieces, and the negative electrode sheet can be folded to form a plurality of folded sections stacked one on another, with one positive electrode sheet interposed between adjacent folded sections.

[0087] As an example, the positive electrode sheet and the negative electrode sheet can each be folded to form a plurality of folded sections stacked one on another.

[0088] As an example, the separator can be provided in a plurality of pieces, each of which is interposed between any adjacent positive electrode sheet or negative electrode sheet.

[0089] As an example, the separator can be provided in a continuous piece, and can be interposed between any adjacent positive electrode sheet or negative electrode sheet by being folded or wound.

[0090] In some embodiments, the electrode assembly can have a flat shape or a polygonal shape.

[0091] In some embodiments, the electrode assembly can be provided with tabs, which can serve to conduct current from the electrode assembly. The tabs can include positive tabs and negative tabs.

[0092] In some embodiments, the battery cell can include a case. The case can serve to enclose the electrode assembly and other components such as the electrolyte. The case can be a steel case, an aluminum case, a composite metal case (e.g., a copper-aluminum composite case), or the like.

[0093] In some embodiments, the case can be a sealed structure or a non-sealed structure. As an example, when the case is a sealed structure, the case can serve to protect the electrode assembly and to prevent, to some extent, leakage of the electrolyte and the like. When the case is a non-sealed structure, the case can serve to protect the electrode assembly, and a sealing bag can be further included between the case and the electrode assembly. The sealing bag can serve to enclose the electrode assembly and the electrolyte and the like. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum laminate film.

[0094] As an example, the battery cell can be a prismatic battery cell or a battery cell having another shape, such as a square battery cell, a blade battery cell, a polygonal battery cell (e.g., a hexagonal battery cell), or the like.

[0095] A battery apparatus according to embodiments of the present application can include one or more battery cell assemblies to provide a voltage and a capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar member.

[0096] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into one independent module.

[0097] As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0098] In some embodiments, the battery device can be a battery pack, which can include a case and one or more battery cell assemblies, the battery cell assemblies being accommodated in the case.

[0099] As an example, the battery cell assembly can be a battery module, which can be accommodated in the case by fixing the battery module in the case.

[0100] As an example, the battery cell assembly can also be accommodated in the case by directly fixing a plurality of battery cells in the case.

[0101] As an example, the case can include a first case body and a second case body. The first case body and the second case body are buckled so that a closed space is formed inside the case to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first case body can be a top cover or a bottom plate.

[0102] As an example, the case can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected with the frame so that a closed space is formed inside the case to accommodate the battery cell assembly.

[0103] As an example, the case can be part of the chassis structure of a vehicle. For example, the top cover of the case can be at least part of the floor of the vehicle, or the frame of the case can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0104] In some embodiments, the battery device refers to an energy storage device, which includes a case, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0105] At present, from the development of market situation, the application of batteries is more and more extensive. Batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of batteries, the demand of its market is also increasing.

[0106] Batteries are widely used in new energy fields, such as electric vehicles, new energy vehicles, etc. New energy vehicles and electric vehicles have become a new trend in the development of the automobile industry. The development of battery technology needs to consider various design factors, such as 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.

[0107] The electrode assembly is a component where electrochemical reactions occur in the battery cell. The electrode assembly has a tab. Currently, when connecting the tab with other electrical connection components, it is easy to affect other components in the battery cell, causing damage to other components. For example, when welding the tab to other electrical connection components, the high temperature of welding easily melts the lower plastic, causing damage to the lower plastic, making the electrode assembly easily contact the shell of the battery cell and cause short circuit, resulting in poor reliability of the battery cell.

[0108] In view of this, the embodiments of the present application provide a battery cell, which comprises an electrode assembly and a first electrode lead-out part. The electrode assembly comprises a plurality of first tab parts with the same polarity, and the plurality of first tab parts are stacked. The first tab part has a sub-tab, and the electrode assembly has a plurality of first tabs. Each first tab is formed by stacking a plurality of sub-tabs, and the number of sub-tabs in each first tab is less than the number of first tab parts. The plurality of first tabs are electrically connected to the first electrode lead-out part.

[0109] The electrode assembly of the battery cell has a plurality of first tabs with the same polarity, each first tab is formed by stacking a plurality of sub-tabs, and the number of sub-tabs in each first tab is less than the number of first tab parts. This is beneficial to reduce the thickness of a single first tab, reduce the power required for connecting the first tab and the first electrode lead-out part, make the connection of the first tab and the first electrode lead-out part more convenient, not easily affect other components, not easily cause damage to other components, and improve the reliability of the battery cell.

[0110] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells and battery devices, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships, and spacecraft, etc. For example, spacecraft includes airplanes, rockets, space shuttles, and spaceships, etc.

[0111] The following embodiments are described for convenience with the electric device as a vehicle.

[0112] Please refer to Figure 1 , Figure 1A structural schematic diagram of a vehicle 1000 is provided for some embodiments of the present application. The interior of the vehicle 1000 is provided with a battery device 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as the operating power supply of the vehicle 1000.

[0113] The vehicle 1000 can also 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, for the power demand of the vehicle 1000 during starting, navigation and driving.

[0114] In some embodiments of the present application, the battery device 100 can not only be used as the operating power supply of the vehicle 1000, but also as the driving power supply of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0115] Please refer to Figure 2 , Figure 2 An exploded view of the battery device 100 is provided for some embodiments of the present application. The battery device 100 can include a box body 10 and a battery cell 20, the box body 10 being used to accommodate the battery cell 20.

[0116] The box body 10 is internally formed with a closed space for accommodating the battery cell 20. The box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 being mutually buckled. The first box body 11 and the second box body 12 can be various shapes, such as a cuboid, a cylinder, etc. The first box body 11 can be a hollow structure with one side open, and the second box body 12 can also be a hollow structure with one side open, the open side of the second box body 12 and the open side of the first box body 11 being buckled to each other, thereby forming the box body 10 with a closed space. Alternatively, the first box body 11 can be a hollow structure with one side open, and the second box body 12 can be a plate-shaped structure, the second box body 12 being buckled to the open side of the first box body 11, thereby forming the box body 10 with an accommodation space.

[0117] In the battery device 100, the battery cell 20 can be one or multiple. If the battery cell 20 is multiple, the multiple battery cells 20 can be connected in series, in parallel or in a mixed manner, the mixed manner referring to that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be connected in series, in parallel or in a mixed manner to form a battery module, and the multiple battery modules can be connected in series, in parallel or in a mixed manner to form an integral whole, which is accommodated in the box body 10. Alternatively, all the battery cells 20 can be directly connected in series, in parallel or in a mixed manner, and the integral whole formed by all the battery cells 20 is accommodated in the box body 10.

[0118] In some embodiments, the battery device 100 can further include a busbar component, through which the plurality of battery cells 20 can be electrically connected to achieve series connection, parallel connection or mixed connection of the plurality of battery cells 20. The busbar component can be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0119] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 , Figure 3 a structural schematic diagram of the battery cell 20 provided in some embodiments of the present application. Figure 4 an exploded view of the battery cell 20 provided in some embodiments of the present application. Figure 5 a structural schematic diagram of the electrode assembly 22 provided in some embodiments of the present application. Figure 6 a front view schematic diagram of the electrode assembly 22 provided in some embodiments of the present application. Figure 7 a sectional view of the position A-A in Figure 6 . Figure 8 a sectional view of the position B-B in Figure 6 . The battery cell 20 provided in the embodiments of the present application includes an electrode assembly 22 and a first electrode lead-out part 23. The electrode assembly 22 includes a plurality of first tab parts 2213 with the same polarity, which are stacked. The first tab part 2213 has a sub-tab 2221, and the electrode assembly 22 has a plurality of first tabs 224, each of which is formed by stacking a plurality of sub-tabs 2221. The number of sub-tabs 2221 in each first tab 224 is less than the number of first tab parts 2213. The plurality of first tabs 224 are all electrically connected to the first electrode lead-out part 23.

[0120] The battery cell 20 refers to the smallest unit that constitutes the battery device 100.

[0121] The battery cell 20 includes a housing 21, and the electrode assembly 22 is accommodated in the housing 21. The housing 21 includes an end cap 212 and a shell 211, and the shell 211 has an open-ended accommodation space for accommodating the electrode assembly 22. The end cap 212 is connected to the shell 211 and closes the opening.

[0122] The end cover 212 refers to a component that covers the opening of the shell 211 to isolate the internal environment of the battery monomer 20 from the external environment. Without limitation, the shape of the end cover 212 can be adapted to the shape of the shell 211 to fit the shell 211. Optionally, the end cover 212 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 212 is not easily deformed when subjected to extrusion collision, so that the battery monomer 20 can have higher structural strength, and the safety performance can also be improved. The material of the end cover 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present application embodiment does not make special limitation. The battery monomer 20 also includes an insulating piece 24, which is arranged on the inner side of the end cover 212, and the insulating piece 24 can be used to isolate the electrical connection components in the shell 211 from the end cover 212 to reduce the risk of short circuit. Exemplarily, the insulating piece 24 can be plastic, rubber, etc.

[0123] The shell 211 is a component for fitting the end cover 212 to form the internal environment of the battery monomer 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, the electrolyte and other components. The shell 211 and the end cover 212 can be independent components, and an opening can be provided on the shell 211, and the end cover 212 is covered on the opening to form the internal environment of the battery monomer 20. Without limitation, the end cover 212 and the shell 211 can also be integrated, specifically, the end cover 212 and the shell 211 can form a common joint surface before other components enter the shell, and when it is necessary to seal the inside of the shell 211, the end cover 212 is covered on the shell 211. The shell 211 can be various shapes and various sizes, such as cuboid, hexagonal prism, etc. Specifically, the shape of the shell 211 can be determined according to the specific shape and size of the electrode assembly 22. The material of the shell 211 can include but is not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0124] In some embodiments, the shell 211 can be formed with an opening at only one end, and the end cover 212 is correspondingly provided. In other embodiments, the shell 211 can be formed with openings at both ends, and the end cover 212 is correspondingly provided with two, and the two end covers 212 respectively close the two opposite openings of the shell 211. Figure 3 and Figure 4 In the embodiment shown in the figure, the shell 211 is formed with openings at both ends, and the end cover 212 is correspondingly provided with two.

[0125] The electrode assembly 22 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 22 can be contained within the case 21. The electrode assembly 22 is mainly formed by winding or layering a positive electrode sheet and a negative electrode sheet, and a separator 2214 is usually provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials that constitute a main body portion 221 of the electrode assembly 22, and portions without active materials that constitute positive sub-tab portions and negative sub-tab portions. In order to ensure that fusing does not occur even when a large current is passed, the number of positive sub-tab portions is plural and they are stacked together to constitute a positive tab 222, and the number of negative sub-tab portions is plural and they are stacked together to constitute a negative tab 223. The positive tab 222 and the negative tab 223 can be located together at one end of the main body portion 221 or at opposite ends of the main body portion 221. During charging and discharging of the battery cell 20, the positive active material and the negative active material react with the electrolyte.

[0126] In some embodiments, the electrode assembly 22 is a stacked structure, and the electrode assembly 22 includes a plurality of positive electrode sheets and a plurality of negative electrode sheets, the plurality of positive electrode sheets and the plurality of negative electrode sheets being stacked. Each positive electrode sheet or each negative electrode sheet can individually serve as the first electrode portion 2213.

[0127] In other embodiments, the electrode assembly 22 is a wound structure, and the electrode assembly 22 includes a positive electrode sheet and a negative electrode sheet, the positive electrode sheet and the negative electrode sheet being wound. The electrode assembly 22 includes a flat region 2215 and two bent regions 2216, the two bent regions 2216 being connected to opposite ends of the flat region 2215. When the positive electrode sheet includes a plurality of first electrode portions 2213, the first electrode portions 2213 can be portions of the positive electrode sheet located in the flat region 2215, or the first electrode portions 2213 can be portions of the positive electrode sheet located in one of the bent regions 2216. When the negative electrode sheet includes a plurality of first electrode portions 2213, the first electrode portions 2213 can be portions of the negative electrode sheet located in the flat region 2215, or the first electrode portions 2213 can be portions of the negative electrode sheet located in one of the bent regions 2216.

[0128] When the first electrode portion 2213 is a positive electrode sheet or a portion of a positive electrode sheet, the sub-tab 2221 is a positive sub-tab, and the first tab 224 is the positive tab 222. When the first electrode portion 2213 is a negative electrode sheet or a portion of a negative electrode sheet, the sub-tab 2221 is a negative sub-tab, and the first tab 224 is the negative tab 223.

[0129] The electrode assembly 22 can have two first tabs 224, three first tabs 224, four first tabs 224, or more first tabs 224. The plurality of first tabs 224 have the same polarity. The first tab 224 is the positive tab 222 or the negative tab 223 described above.

[0130] Each first tab 224 is formed by stacking a plurality of sub tabs 2221. When the first tab 224 is a positive tab 222, the first tab 224 is formed by stacking a plurality of positive sub tabs. When the first tab 224 is a negative tab 223, the first tab 224 is formed by stacking a plurality of negative sub tabs.

[0131] The number of sub tabs 2221 in each first tab 224 is less than the number of first tab portions 2213. Please refer to Figure 7 and Figure 8 In the embodiment shown in the figure, the number of first tab portions 2213 is 6, and each first tab 224 is formed by stacking 3 sub tabs 2221.

[0132] It should be noted that the number of sub tabs 2221 in different first tabs 224 can be the same or different.

[0133] The first electrode lead-out portion 23 is used to electrically connect with the first tab 224 of the electrode assembly 22 to output the electric energy of the electrode assembly 22 or input the electric energy to the electrode assembly 22. When the first tab 224 is a positive tab 222, the first electrode lead-out portion 23 outputs the positive electrode of the battery monomer 20, i.e. the first electrode lead-out portion 23 is the positive output electrode of the battery monomer 20. When the first tab 224 is a negative tab 223, the first electrode lead-out portion 23 outputs the negative electrode of the battery monomer 20, i.e. the first electrode lead-out portion 23 is the negative output electrode of the battery monomer 20. The structure of the first electrode lead-out portion 23 can be various. The first electrode lead-out portion 23 can be an electrode terminal 231 mounted on the shell 21, and the first electrode lead-out portion 23 can also be a wall portion of the shell 21. For example, in Figure 3 and Figure 4 , the first electrode lead-out portion 23 is an electrode terminal 231 arranged on the end cover 212.

[0134] The electrode assembly 22 of the battery monomer 20 has a plurality of first tabs 224 with the same polarity, each first tab 224 is formed by stacking a plurality of sub tabs 2221, and the number of sub tabs 2221 in each first tab 224 is less than the number of first tab portions 2213. This is beneficial to reduce the thickness of a single first tab 224, reduce the power required for connecting the first tab 224 and the first electrode lead-out portion 23, make the connection of the first tab 224 and the first electrode lead-out portion 23 more convenient, not easy to affect other components, not easy to cause damage to other components, and improve the reliability of the battery monomer 20.

[0135] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8In some embodiments, the sum of the number of sub-pole tabs 2221 of the plurality of first pole tabs 224 is equal to the number of first tab portions 2213.

[0136] The “sum of the number of sub-pole tabs 2221 of the plurality of first pole tabs 224 is equal to the number of first tab portions 2213” means that the sum of the number of sub-pole tabs 2221 of all the first pole tabs 224 is equal to the number of first tab portions 2213.

[0137] Please refer to Figure 7 and Figure 8 In the embodiments shown in Figure 7 and Figure 8 , the electrode assembly 22 includes two first pole tabs 224, each of which is formed by stacking 3 sub-pole tabs 2221, and the first tab portions 2213 are 6 in number.

[0138] By making the sum of the number of sub-pole tabs 2221 of the plurality of first pole tabs 224 equal to the number of first tab portions 2213, each first tab portion 2213 has only one sub-pole tab 2221, which is simple and convenient to manufacture and helps to reduce the manufacturing cost of the battery monomer 20.

[0139] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 In some embodiments, each first tab portion 2213 has only one sub-pole tab 2221.

[0140] By making each first tab portion 2213 have only one sub-pole tab 2221, it is simple and convenient to manufacture, which helps to reduce the manufacturing cost of the battery monomer 20.

[0141] In other embodiments, some of the plurality of first tab portions 2213 have a plurality of sub-pole tabs 2221, which helps to improve the overcurrent capacity of the battery monomer 20.

[0142] Please refer to Figure 7 and Figure 8 In some embodiments, the sub-pole tabs 2221 of adjacent first tab portions 2213 are stacked to form a first pole tab 224.

[0143] The “sub-pole tabs 2221 of adjacent first tab portions 2213 are stacked to form a first pole tab 224” means that along the stacking direction of the plurality of first tab portions 2213, the sub-pole tabs 2221 of the plurality of first tab portions 2213 arranged continuously are stacked to form a first pole tab 224.

[0144] By laminating the sub-tab 2221 of the adjacent first tab portion 2213 to form the first tab 224, it is relatively simple to arrange the plurality of first tab portions 2213 in a wall manner, which can reduce the manufacturing difficulty, improve the manufacturing efficiency, and reduce the manufacturing cost of the battery monomer 20.

[0145] Please refer to Figure 9 and Figure 10 , Figure 9 The electrode assembly 22 provided by some embodiments of the present application is a cross-sectional view taken along a section of a first tab 224. Figure 10 The electrode assembly 22 provided by some embodiments of the present application is a cross-sectional view taken along a section of another first tab 224. In other embodiments, in the first tab 224, the first tab portions 2213 corresponding to the adjacent two sub-tabs 2221 are separated by at least one first tab portion 2213.

[0146] In a first tab 224, the first tab portions 2213 corresponding to the adjacent two sub-tabs 2221 can be separated by one first tab portion 2213, two first tab portions 2213, three first tab portions 2213, or more first tab portions 2213.

[0147] Please refer to Figure 9 and Figure 10 , in Figure 9 and Figure 10 , in the embodiments, in the first tab 224, the first tab portions 2213 corresponding to the adjacent two sub-tabs 2221 can be separated by one first tab portion 2213.

[0148] In a first tab 224, the first tab portions 2213 corresponding to the adjacent two sub-tabs 2221 are separated by at least one first tab portion 2213, which is beneficial to make the tab positions of the two first tabs 224 in the stacking direction of the plurality of first tab portions 2213 relatively close, thereby facilitating the connection with the first electrode lead-out portion 23.

[0149] Please refer to Figure 4 and Figure 5 , in some embodiments, the plurality of first tabs 224 are located at the same end of the electrode assembly 22 along a first direction, and the plurality of first tabs 224 are arranged at intervals along a second direction. The first direction and the second direction are perpendicular.

[0150] Please refer to Figure 4 and Figure 5 , the first direction is the X direction shown in the figure. The second direction is the arrangement direction of the plurality of first tabs 224, and the second direction is the Y direction shown in the figure.

[0151] In the first direction, all the first tabs 224 are located at the same end of the electrode assembly 22. Figure 4 In the embodiment shown in FIG. 1, all the first tabs 224 are located at the lower end of the electrode assembly 22. Figure 5 In the embodiment shown in FIG. 1, all the first tabs 224 are located at the lower end of the electrode assembly 22.

[0152] In the second direction, the plurality of first tabs 224 are arranged with a gap between any two adjacent first tabs 224.

[0153] By arranging the plurality of first tabs 224 at the same end of the electrode assembly 22 in the first direction, it is convenient to connect the plurality of first tabs 224 with the same first electrode lead 23. By arranging the plurality of first tabs 224 with a gap in the second direction, it is beneficial to reduce the risk of interference between any two adjacent first tabs 224 when the plurality of stacked sub-tabs 2221 are misaligned.

[0154] Please refer to Figure 11 , Figure 11 The structure diagram of the connection between the first tab 224 and the electrode terminal 231 provided in some embodiments of the present application. In some embodiments, in the second direction, the minimum distance between any two adjacent first tabs 224 is A, which satisfies: 2mm≤A≤8mm.

[0155] A represents the minimum distance between any two adjacent first tabs 224 in the second direction. When measuring, the distance between the two closest sub-tabs 2221 in the two adjacent first tabs 224 in the second direction can be measured as A.

[0156] The minimum distance between any two adjacent first tabs 224 in the second direction can be: A=2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, etc.

[0157] When A≥2mm, the minimum distance between any two adjacent first tabs 224 in the second direction is large, which is beneficial to reduce the risk of interference between any two adjacent first tabs 224 when the plurality of stacked sub-tabs 2221 are misaligned. When A≤8mm, the minimum distance between any two adjacent first tabs 224 in the second direction is not too large, on the one hand, it is beneficial to make the width of a single first tab 224 larger, thereby facilitating the connection with the first electrode lead 23. On the other hand, it is beneficial to reduce the size of the first electrode lead 23, reduce the risk of interference between the first electrode lead 23 and other components, and improve the reliability of the battery monomer 20. In addition, after connecting one first tab 224 with the first electrode lead 23, the connecting equipment can be quickly transferred to the position of another first tab 224, which is beneficial to reduce the migration path of the connecting equipment, shorten the manufacturing time, improve the manufacturing efficiency, and reduce the manufacturing cost of the battery monomer 20. Therefore, when 2mm≤A≤8mm, the reliability and manufacturing cost of the battery monomer 20 can be considered.

[0158] Optionally, 2mm≤A≤6mm.

[0159] The minimum distance between two adjacent first tabs 224 along the second direction can be: A=2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, etc.

[0160] When A≥2mm, the minimum distance between two adjacent first tabs 224 along the second direction is larger, which is beneficial to reduce the risk of interference between two adjacent first tabs 224 when the plurality of stacked sub-tabs 2221 are misaligned. When A≤6mm, the minimum distance between two adjacent first tabs 224 along the second direction is not too large, on the one hand, which is beneficial to make the width of a single first tab 224 larger, thereby facilitating the connection with the first electrode lead-out part 23. On the other hand, it is beneficial to further reduce the size of the first electrode lead-out part 23, reduce the risk of interference between the first electrode lead-out part 23 and other components, and improve the reliability of the battery monomer 20. In addition, after connecting one first tab 224 with the first electrode lead-out part 23, the connecting equipment can be transferred to the position of another first tab 224 faster, which is beneficial to reduce the migration path of the connecting equipment, shorten the manufacturing time, improve the manufacturing efficiency, and further reduce the manufacturing cost of the battery monomer 20. Therefore, when 2mm≤A≤6mm, the reliability and manufacturing cost of the battery monomer 20 can be better balanced.

[0161] Please refer to Figure 11 In some embodiments, the battery monomer 20 includes a shell 21 and an electrode terminal 231, the electrode assembly 22 is contained in the shell 21, and the electrode terminal 231 is arranged on the shell 21. The electrode terminal 231 is the first electrode lead-out part 23.

[0162] The electrode terminal 231 is used to electrically connect with the first tab 224 of the electrode assembly 22 to output the electrical energy of the electrode assembly 22 or input the electrical energy to the electrode assembly 22. The electrode terminal 231 can be directly connected with the first tab 224, for example, the electrode terminal 231 is directly welded with the first tab 224. The electrode terminal 231 can also be indirectly connected with the first tab 224, for example, the electrode terminal 231 is indirectly connected with the first tab 224 through a current collecting member.

[0163] The electrode terminal 231 can be arranged on the end cover 212, and the electrode terminal 231 can also be arranged on a wall of the shell 211.

[0164] The electrode terminal 231 is the first electrode lead-out part 23, and the electrical energy of the electrode assembly 22 is output or input to the electrode assembly 22 through the electrode terminal 231, which has high reliability.

[0165] In some embodiments, the plurality of first tabs 224 are each welded to the electrode terminal 231.

[0166] The plurality of first tabs 224 are each welded to the electrode terminal 231, that is, the plurality of first tabs 224 and the electrode terminal 231 are directly connected by welding.

[0167] By welding the plurality of first tabs 224 and the electrode terminal 231, on the one hand, the welding process is relatively simple, which is conducive to reducing manufacturing costs. On the other hand, the connection between the first tab 224 and the electrode terminal 231 is relatively strong, so that the connection between the first tab 224 and the electrode terminal 231 is not prone to failure, which is conducive to improving the reliability of the battery monomer 20.

[0168] For more details, please refer to Figure 11 In some embodiments, the plurality of first tabs 224 are spaced apart along the second direction, and the first tab 224 is welded to the electrode terminal 231 to form a welding portion 225. Along the second direction, the length of the welding portion 225 is L, which satisfies: 5mm≤L≤15mm.

[0169] The welding portion 225 is a welding mark formed by welding the first tab 224 and the electrode terminal 231.

[0170] L represents the length of the welding portion 225 along the second direction. When measuring, multiple measurements can be taken and the average value is taken as L.

[0171] The length of the welding portion 225 along the second direction can be: L=5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc.

[0172] When L≥5mm, the length of the welding portion 225 along the second direction is relatively large, and the connection between the first tab 224 and the electrode terminal 231 is relatively strong, so that the connection between the first tab 224 and the electrode terminal 231 is not prone to failure, which is conducive to improving the reliability of the battery monomer 20. When L≤15mm, the length of the welding portion 225 along the second direction is not too large, so that the welding time is shortened under the condition that the first tab 224 and the electrode terminal 231 have relatively high connection strength, the production efficiency is improved, and the manufacturing cost of the battery monomer 20 is reduced. Moreover, it is also conducive to controlling the welding heat, reducing the risk of deformation of the first tab 224 and / or the electrode terminal 231, and reducing the risk of burning other components, which is conducive to improving the reliability of the battery monomer 20. Therefore, when 5mm≤L≤15mm, the reliability and manufacturing cost of the battery monomer 20 can be considered.

[0173] Optionally, 8mm≤L≤12mm.

[0174] The length of the welding portion 225 along the second direction can be L = 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, 11.5 mm, 12 mm, etc.

[0175] When L ≥ 8 mm, the length of the welding portion 225 along the second direction is greater, and the strength of the connection between the first tab 224 and the electrode terminal 231 is higher, so that the connection between the first tab 224 and the electrode terminal 231 is less likely to fail, which is more conducive to improving the reliability of the battery monomer 20. When L ≤ 12 mm, the length of the welding portion 225 along the second direction is not too large, so that the welding time is shortened under the condition that the first tab 224 and the electrode terminal 231 have a high connection strength, the production efficiency is improved, and the manufacturing cost of the battery monomer 20 is reduced. And it is also conducive to controlling the welding heat, reducing the risk of deformation of the first tab 224 and / or the electrode terminal 231, reducing the risk of burning other components, and being conducive to improving the reliability of the battery monomer 20. Therefore, when 8 mm ≤ L ≤ 12 mm, the reliability and manufacturing cost of the battery monomer 20 can be better balanced.

[0176] Please refer to Figure 11 In some embodiments, the electrode assembly 22 has N first tabs 224. Along the second direction, the minimum distance between two adjacent first tabs 224 is A. The maximum size of the electrode terminal 231 along the second direction is B. Each first tab 224 is connected to the electrode terminal 231 by a welding portion 225, which satisfies: ((N-1) × A + N × L + 4N) mm ≤ B ≤ ((N-1) × A + N × L + 16N) mm.

[0177] N ≥ 2 and N is an integer.

[0178] B represents the maximum size of the electrode terminal 231 along the second direction. When measuring, multiple measurements can be taken and the average value is taken as B.

[0179] Each first tab 224 is welded and connected to the electrode terminal 231 to form a welding portion 225, which can be a strip structure extending along the second direction.

[0180] Along the second direction, two adjacent first tabs 224 have a gap therebetween, and each gap has a length A along the second direction. N first tabs 224 form N-1 gaps. (N-1) × A represents the total length of the N-1 gaps.

[0181] N × L represents the total length of the N welding portions 225 along the second direction.

[0182] After the first tab 224 is welded with the electrode terminal 231 to form the weld portion 225, the length of the remaining part of the first tab 224 along the second direction can be 4 mm. 4N represents the total length of the plurality of remaining parts of the first tab 224.

[0183] After the first tab 224 is welded with the electrode terminal 231 to form the weld portion 225, the length of the remaining part of the first tab 224 along the second direction can be 16 mm. 16N represents the total length of the plurality of remaining parts of the first tab 224.

[0184] The maximum dimension of the electrode terminal 231 along the second direction can be ((N-1) x A + N x L + 4N) mm, ((N-1) x A + N x L + 6N) mm, ((N-1) x A + N x L + 8N) mm, ((N-1) x A + N x L + 10N) mm, ((N-1) x A + N x L + 12N) mm, ((N-1) x A + N x L + 14N) mm, ((N-1) x A + N x L + 16N) mm, etc.

[0185] When B is greater than or equal to ((N-1) x A + N x L + 4N) mm, the maximum dimension of the electrode terminal 231 along the second direction is large, which on the one hand is conducive to increasing the connection area of the first tab 224 and the electrode terminal 231 and improving the overcurrent capacity. On the other hand, it is convenient to connect the first tab 224 to the electrode terminal 231, which is conducive to reducing the risk of damaging other components during the connection process. When B is less than or equal to ((N-1) x A + N x L + 16N) mm, the maximum dimension of the electrode terminal 231 along the second direction is not too large, which is conducive to reducing the risk of interference between the electrode terminal 231 and other components and improving the reliability of the battery monomer 20. Therefore, when ((N-1) x A + N x L + 4N) mm ≤ B ≤ ((N-1) x A + N x L + 16N) mm, the overcurrent capacity and the reliability of the battery monomer 20 can be considered.

[0186] Please refer to Figure 11 In some embodiments, the plurality of first tabs 224 are arranged at intervals along the second direction. Along the second direction, the maximum dimension of the electrode terminal 231 is B, and the maximum dimension of the shell 21 is C, which satisfies: 0.25 ≤ B / C ≤ 0.6.

[0187] C represents the maximum dimension of the shell 21 along the second direction. When measuring, the average value can be obtained by measuring multiple times.

[0188] B / C represents the ratio of the maximum dimension of the electrode terminal 231 along the second direction to the maximum dimension of the shell 21 along the second direction.

[0189] The ratio of the maximum dimension of the electrode terminal 231 along the second direction to the maximum dimension of the shell 21 along the second direction can be B / C = 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, etc.

[0190] When B / C is greater than or equal to 0.25, the maximum dimension of the electrode terminal 231 along the second direction is relatively large, on the one hand, which is conducive to increasing the connection area of the first tab 224 and the electrode terminal 231 and improving the overcurrent capacity. On the other hand, it is convenient to connect the first tab 224 to the electrode terminal 231, which is conducive to reducing the risk of damaging other components during the connection process. When B / C is less than or equal to 0.6, the maximum dimension of the electrode terminal 231 along the second direction is not too large, which is conducive to reducing the risk of interference between the electrode terminal 231 and other components and improving the reliability of the battery monomer 20. Therefore, when 0.25≤B / C≤0.6, the overcurrent capacity and the reliability of the battery monomer 20 can be considered.

[0191] Optionally, 0.25≤B / C≤0.5.

[0192] The ratio of the maximum dimension of the electrode terminal 231 along the second direction to the maximum dimension of the shell 21 along the second direction can be B / C = 0.25, 0.28, 0.3, 0.32, 0.35, 0.38, 0.4, 0.42, 0.45, 0.48, 0.5, etc.

[0193] When B / C is greater than or equal to 0.25, the maximum dimension of the electrode terminal 231 along the second direction is relatively large, on the one hand, which is conducive to increasing the connection area of the first tab 224 and the electrode terminal 231 and improving the overcurrent capacity. On the other hand, it is convenient to connect the first tab 224 to the electrode terminal 231, which is conducive to reducing the risk of damaging other components during the connection process. When B / C is less than or equal to 0.5, the maximum dimension of the electrode terminal 231 along the second direction is not too large, which is more conducive to reducing the risk of interference between the electrode terminal 231 and other components and improving the reliability of the battery monomer 20. Therefore, when 0.25≤B / C≤0.6, the overcurrent capacity and the reliability of the battery monomer 20 can be considered.

[0194] In other embodiments, the battery monomer 20 includes a shell 21, the electrode assembly 22 is contained in the shell 21, and the first electrode lead-out portion 23 is a wall portion of the shell 21.

[0195] The first electrode lead-out portion 23 can be a bottom wall of the shell 211 opposite to the end cover 212, and the electrode lead-out portion can also be a side wall of the shell 211 adjacent to and connected to the end cover 212.

[0196] The first electrode lead-out part 23 is a wall part of the outer casing 21. Electrical energy of the electrode assembly 22 can be output or input to the electrode assembly 22 through a wall part of the outer casing 21. This can reduce the number of electrode terminals 231, which is beneficial to reduce the occupation of the electrode terminals 231 on the internal space of the battery cell 20 and improve the energy density of the battery cell 20.

[0197] Please refer to Figure 7 , Figure 8 , Figure 9 and Figure 10 In some embodiments, the electrode assembly 22 is a stacked structure, and the electrode assembly 22 includes a plurality of first electrode plates 2211 and a plurality of second electrode plates 2212. The first electrode plates 2211 and the second electrode plates 2212 have opposite polarities, and the first electrode plate 2211 is a first electrode plate portion 2213.

[0198] The electrode assembly 22 has a stacked structure, that is, the electrode assembly 22 is a stacked electrode assembly.

[0199] One of the first electrode 2211 and the second electrode 2212 is a positive electrode, and the other is a negative electrode. For example, when the first electrode 2211 is a positive electrode, the second electrode 2212 is a negative electrode. When the first electrode 2211 is a negative electrode, the second electrode 2212 is a positive electrode.

[0200] When the electrode assembly 22 is a stacked structure, the electrode assembly 22 includes a plurality of first electrode plates 2211 and a plurality of second electrode plates 2212. The plurality of first electrode plates 2211 and the plurality of second electrode plates 2212 have opposite polarities and are stacked. Each first electrode plate 2211 can be used as a first electrode plate part 2213.

[0201] Please refer to Figure 12 , Figure 12 The diagram below illustrates the structure of an electrode assembly 22 provided in other embodiments of this application. In other embodiments, the electrode assembly 22 has a wound structure and includes a first electrode 2211 and a second electrode 2212. The first electrode 2211 and the second electrode 2212 have opposite polarities, and the first electrode 2211 includes a plurality of first electrode portions 2213.

[0202] The electrode assembly 22 has a wound structure, that is, the electrode assembly 22 is a wound electrode assembly.

[0203] The electrode assembly 22 includes a flat region 2215 and two bent regions 2216, with the two bent regions 2216 connected to both ends of the flat region 2215. Each first electrode 2211 includes a plurality of first electrode portions 2213, which may be the portion of the first electrode 2211 located in the flat region 2215 or the portion of the first electrode 2211 located in one of the bent regions 2216.

[0204] When the electrode assembly 22 is in a jelly-roll structure, the electrode assembly 22 includes first electrode tabs 2211 and second electrode tabs 2212, the first electrode tabs 2211 and the second electrode tabs 2212 are oppositely polarized and are arranged in a jelly-roll structure, each of the first electrode tabs 2211 includes a plurality of first electrode tab portions 2213.

[0205] The application also provides a battery device 100, the battery device 100 includes the battery cell 20.

[0206] The application also provides a power consumption device, the power consumption device includes the battery cell 20.

[0207] According to some embodiments of the application, please refer to Figures 3-12 .

[0208] The application provides a battery cell 20, the battery cell 20 includes an electrode assembly 22 and a first electrode lead-out portion 23. The electrode assembly 22 includes a plurality of first electrode tab portions 2213 with the same polarity, the plurality of first electrode tab portions 2213 are arranged in a stack, and each of the first electrode tab portions 2213 has a sub-tab 2221. The electrode assembly 22 has a plurality of first tabs 224, each of the first tabs 224 is formed by stacking a plurality of sub-tabs 2221, and the number of the sub-tabs 2221 in each of the first tabs 224 is less than the number of the first electrode tab portions 2213. The plurality of first tabs 224 are electrically connected to the first electrode lead-out portion 23. The electrode assembly 22 of the battery cell 20 has a plurality of first tabs 224 with the same polarity, each of the first tabs 224 is formed by stacking a plurality of sub-tabs 2221, and the number of the sub-tabs 2221 in each of the first tabs 224 is less than the number of the first electrode tab portions 2213, which is beneficial to reduce the thickness of each of the first tabs 224, reduce the power required for connecting the first tabs 224 and the first electrode lead-out portion 23, make the connection of the first tabs 224 and the first electrode lead-out portion 23 more convenient, and not easily affect or damage other components, thereby improving the reliability of the battery cell 20.

[0209] The sum of the number of the sub-tabs 2221 of the plurality of first tabs 224 is equal to the number of the first electrode tab portions 2213. By making the sum of the number of the sub-tabs 2221 of the plurality of first tabs 224 equal to the number of the first electrode tab portions 2213, each of the first electrode tab portions 2213 has only one sub-tab 2221, which is simple and convenient in manufacturing, and is beneficial to reduce the manufacturing cost of the battery cell 20.

[0210] The plurality of first tabs 224 are located at the same end of the electrode assembly 22 along a first direction, and the plurality of first tabs 224 are spaced apart along a second direction, the first direction and the second direction being perpendicular. By arranging the plurality of first tabs 224 at the same end of the electrode assembly 22 along the first direction, the plurality of first tabs 224 are facilitated to be connected to the same first electrode lead 23. By spacing apart the plurality of first tabs 224 along the second direction, the risk of interference between adjacent two first tabs 224 when the plurality of stacked sub-tabs 2221 are misaligned is reduced.

[0211] In some embodiments, the electrode assembly 22 is a stacked structure, and the electrode assembly 22 includes a plurality of first tabs 2211 and a plurality of second tabs 2212, the first tabs 2211 and the second tabs 2212 being opposite in polarity, and the first tabs 2211 being the first tab portions 2213. When the electrode assembly 22 is the stacked structure, the electrode assembly 22 includes the plurality of first tabs 2211 and the plurality of second tabs 2212, the plurality of first tabs 2211 and the plurality of second tabs 2212 being opposite in polarity and stacked, and each of the first tabs 2211 can be individually used as the first tab portion 2213.

[0212] In some other embodiments, the electrode assembly 22 is a wound structure, and the electrode assembly 22 includes first tabs 2211 and second tabs 2212, the first tabs 2211 and the second tabs 2212 being opposite in polarity, and the first tabs 2211 including a plurality of first tab portions 2213. When the electrode assembly 22 is the wound structure, the electrode assembly 22 includes the first tabs 2211 and the second tabs 2212, the first tabs 2211 and the second tabs 2212 being opposite in polarity and wound, and each of the first tabs 2211 includes the plurality of first tab portions 2213.

[0213] 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 principles and technical solutions of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized by, The battery monomer comprises a shell and an electrode terminal, the electrode assembly is accommodated in the shell, the electrode terminal is arranged on the shell, and the electrode terminal is the first electrode lead-out part. The plurality of first electrode tabs are each welded to the electrode terminal. The plurality of first electrode tabs are arranged at intervals along a second direction, and the first electrode tabs are welded to the electrode terminal to form a welding mark part; Along the second direction, the length of the welding mark part is L, and 5mm≤L≤15mm is satisfied.

2. The battery cell of claim 1, wherein, 8mm≤L≤12mm.

3. The battery cell of claim 1, wherein, The electrode assembly has N first electrode tabs, and the minimum distance between two adjacent first electrode tabs along the second direction is A; 4. The battery cell of claim 1, wherein, The maximum size of the electrode terminal along the second direction is B; 5. The battery cell of claim 1, wherein, Each first electrode tab is connected to the electrode terminal through one welding mark part, and ((N-1)×A+N×L+4N)mm≤B≤((N-1)×A+N×L+16N)mm is satisfied.

6. The battery cell of claim 1, wherein, The plurality of first electrode tabs are arranged at intervals along a second direction; 7. The battery cell of claim 6, wherein the cathode comprises a lithium metal oxide. Along the second direction, the maximum size of the electrode terminal is B, and the maximum size of the shell is C, and 0.25≤B / C≤0.6 is satisfied.

8. The battery cell of claim 7, wherein, 0.25≤B / C≤0.

5.

9. The battery cell of any one of claims 1-8, wherein, The battery monomer comprises a shell, the electrode assembly is accommodated in the shell, and the first electrode lead-out part is a wall part of the shell.

10. The battery cell of claim 9, wherein, The electrode assembly is a laminated structure, the electrode assembly comprises a plurality of first poles and a plurality of second poles, the polarities of the first poles and the second poles are opposite, and the first poles are the first pole parts.

11. The battery cell of claim 10, wherein, The electrode assembly is a winding structure, the electrode assembly comprises a first pole and a second pole, the polarities of the first pole and the second pole are opposite, and the first pole comprises a plurality of the first pole parts. The battery monomer comprises a shell and an electrode terminal, the electrode assembly is accommodated in the shell, the electrode terminal is arranged on the shell, and the electrode terminal is the first electrode lead-out part.

12. The battery cell of claim 11, wherein, The plurality of first electrode tabs are each welded to the electrode terminal.

13. The battery cell of claim 11, wherein the cathode comprises a lithium metal oxide. The plurality of first electrode tabs are arranged at intervals along a second direction, and the first electrode tabs are welded to the electrode terminal to form a welding mark part; Along the second direction, the length of the welding mark part is L, and 5mm≤L≤15mm is satisfied. 8mm≤L≤12mm. The electrode assembly has N first electrode tabs, and the minimum distance between two adjacent first electrode tabs along the second direction is A; 14. The battery cell of claim 9, wherein the cathode comprises a lithium metal oxide. The maximum size of the electrode terminal along the second direction is B; Each first electrode tab is connected to the electrode terminal through one welding mark part, and ((N-1)×A+N×L+4N)mm≤B≤((N-1)×A+N×L+16N)mm is satisfied.

15. The battery cell of claim 14, wherein the cathode comprises a lithium metal oxide. The plurality of first electrode tabs are arranged at intervals along a second direction; 16. The battery cell of any one of claims 1-8, wherein, Along the second direction, the maximum size of the electrode terminal is B, and the maximum size of the shell is C, and 0.25≤B / C≤0.6 is satisfied.

17. The battery cell according to any one of claims 1-8, characterized in that, 0.25≤B / C≤0.

5.

18. The battery cell of any one of claims 1-8, wherein, The battery monomer comprises a shell, the electrode assembly is accommodated in the shell, and the first electrode lead-out part is a wall part of the shell.

19. A battery device characterized by comprising: The electrode assembly is a laminated structure, the electrode assembly comprises a plurality of first poles and a plurality of second poles, the polarities of the first poles and the second poles are opposite, and the first poles are the first pole parts. The electrode assembly is a winding structure, the electrode assembly comprises a first pole and a second pole, the polarities of the first pole and the second pole are opposite, and the first pole comprises a plurality of the first pole parts. The battery monomer comprises a shell and an electrode terminal, the electrode assembly is accommodated in the shell, the electrode terminal is arranged on the shell, and the electrode terminal is the first electrode lead-out part.

20. An electrical device, comprising: A battery cell according to any one of claims 1-18 for providing electrical energy to the electrical device.

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