Electrode assembly and method for processing the same, battery cell, battery, electric device, cutting knife assembly

Abstract

The application discloses an electrode assembly and a processing method thereof, a battery monomer, a battery, a power utilization device, and a cutting knife assembly. The electrode assembly comprises an active material coating part and a tab part. The tab part comprises a plurality of tab pieces which are stacked and connected. The overlapping parts of the plurality of tab pieces form an overlapping area. The misaligned parts of the plurality of tab pieces form a misaligned area which is connected with the overlapping area. The misaligned area comprises a first connecting part and a second connecting part. The first connecting part is connected with the active material coating part on one side in a first direction. The second connecting part is connected with the first connecting part on the other side in the first direction. In a second direction, one end of the second connecting part away from the overlapping area is closer to the overlapping area than one end of the first connecting part away from the overlapping area. Thus, the reliability of the connection between the tab part and the active material coating part can be improved, and the convenience of the tab part in assembly with other components can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to an electrode assembly, a processing method thereof, a battery monomer, a battery, a power utilization device and a cutting knife assembly. BACKGROUND

[0002] In recent years, new energy vehicles have made a great leap in development. In the field of electric vehicles, batteries, as the power source of electric vehicles, play an irreplaceable important role. Among them, batteries as core components of new energy vehicles have higher requirements in terms of energy density and reliability, especially the reliability needs to be further improved. SUMMARY

[0003] The present application provides an electrode assembly, a processing method thereof, a battery monomer, a battery, a power utilization device and a cutting knife assembly. The electrode assembly has good reliability, which can improve the use reliability of the battery monomer.

[0004] In a first aspect, an electrode assembly is provided, including an active material coating part and a tab part, the tab part is connected with the active material coating part, the tab part includes a plurality of tab pieces stacked and connected, the overlapping parts of the plurality of tab pieces form an overlapping area, and the misaligned parts of the plurality of tab pieces form a misaligned area connected with the overlapping area; wherein the misaligned area includes a first connecting part and a second connecting part, the first connecting part is connected with the active material coating part on one side along a first direction, and the second connecting part is connected with the first connecting part on the other side along the first direction; in a second direction, one end of the second connecting part away from the overlapping area is closer to the overlapping area than one end of the first connecting part away from the overlapping area, and the second direction intersects the first direction.

[0005] In the technical solution, the staggered area of the plurality of tab pieces includes the first connecting part and the second connecting part, and in the second direction, the end of the second connecting part away from the overlapping area is closer to the overlapping area than the end of the first connecting part away from the overlapping area, so that the width of the tab part corresponding to the position of the second connecting part in the second direction is smaller than the width of the tab part corresponding to the position of the first connecting part in the second direction, so as to fully utilize the staggered area of the plurality of tab pieces, increase the connection length of the tab part and the active material coating part, improve the electrical connection area and connection reliability of the tab part and the active material coating part, and improve the use reliability and overcurrent capacity of the electrode assembly, thereby improving the use reliability of the battery cell. At the same time, the width of the staggered area at the end of the tab part can be reduced. If the tab part needs to pass through the avoiding part of other components (for example, the tab part passes through the hole on the pole column described below), the interference between the tab part and other components such as the pole column is reduced, which is beneficial to further improve the reliability of the battery cell and save the space required for the tab part in the passing operation, thereby improving the passing convenience of the tab part and the assembly convenience and efficiency of the battery cell.

[0006] In some embodiments, the end edge of the second connecting part away from the overlapping area is in a sawtooth structure; and / or, the end edge of the first connecting part away from the active material coating part is in a sawtooth structure.

[0007] In the technical solution, the end edge of the second connecting part away from the overlapping area is in a sawtooth structure, or the end edge of the first connecting part away from the active material coating part is in a sawtooth structure, so as to control the length of the wire drawn from the edge of the tab part by controlling the width of the sawtooth structure, so as to improve the problem of short circuit caused by the long wire drawn from the edge of the tab part falling into or extending into other positions to a certain extent, and improve the safety of the electrode assembly.

[0008] In some embodiments, the sawtooth structure includes a plurality of convex parts arranged in sequence in the first direction, and the height h1 of the convex part is less than or equal to 2 mm; and / or, the projection of the convex part in the thickness direction of the tab part is a circumscribed circle with a diameter d1 less than or equal to 2 mm.

[0009] In the technical solution, the height h1 of the convex part is less than or equal to 2 mm, and / or the projection of the convex part in the thickness direction of the tab part is a circumscribed circle with a diameter d1 less than or equal to 2 mm, so as to effectively control the length of the wire drawn from the edge of the tab part, and reduce the risk of short circuit caused by the convex part even if the entire sawtooth structure is folded.

[0010] In some embodiments, the sawtooth structure includes a plurality of convex parts arranged in sequence in the first direction, and the convex part is square or trapezoidal.

[0011] In the technical scheme, the convex part is square or trapezoidal, so that the shape of the convex part is simplified, the processing is facilitated, the height and width of the convex part are controlled reasonably, and the length of the wire is controlled conveniently.

[0012] In some embodiments, when the edge of the second connecting part is formed with a sawtooth structure, a first groove is formed at a position of the first connecting part connected to an edge of the second connecting part away from the overlapping region; or when the edge of the first connecting part is formed with a sawtooth structure, a second groove is formed at a position of the second connecting part connected to an edge of the first connecting part away from the active material coating part.

[0013] In the technical scheme, when the second connecting part is formed with a sawtooth structure, the side edge of the first connecting part away from the active material coating part is formed with a first groove, or when the first connecting part is formed with a sawtooth structure, the side edge of the second connecting part away from the overlapping region is formed with a second groove. The first groove or the second groove can be formed by cutting, which reduces the requirement for the position of the cutting knife in the first direction during the cutting of the first groove or the second groove, and the cutting knife is hindered to some extent, thereby improving the cutting balance and accuracy.

[0014] In some embodiments, at least one of the edge of the first connecting part away from the active material coating part and the edge of the second connecting part away from the overlapping region is obtained by cutting.

[0015] In the technical scheme, at least one of the edge of the first connecting part away from the active material coating part and the edge of the second connecting part away from the overlapping region is obtained by cutting, which effectively shortens the length of the wire of the edge of the tab part after the cutting of the electrode assembly, effectively improves the problem that the tab part is easily cut into a long wire after cutting, and to some extent, improves the problem of short circuit caused by the long wire falling into or extending into other positions.

[0016] In some embodiments, the overlapping region is provided with a misalignment region on each of the opposite sides in the second direction.

[0017] In the technical scheme, the overlapping region is provided with a misalignment region on each of the opposite sides in the second direction, which further increases the connection length of the tab part and the active material coating part, further improves the electrical connection area and connection reliability of the tab part and the active material coating part, and further improves the use reliability and overcurrent capacity of the electrode assembly.

[0018] In some embodiments, the active material coating portion includes a positive electrode tab body, a negative electrode tab body, and a separator film, a plurality of tab pieces are respectively connected to the positive electrode tab body and the negative electrode tab body, and the separator film is arranged between the positive electrode tab body and the negative electrode tab body and extends beyond the positive electrode tab body and the negative electrode tab body; wherein at least part of the first connecting portion is shielded by the separator film.

[0019] In the technical solution, at least part of the first connecting portion is shielded by the separator film, so that the at least part of the first connecting portion shielded by the separator film is insulated, the length of the first connecting portion that can bypass the separator film to extend into other positions to cause short circuit is shortened, and the safety of the electrode assembly is further improved.

[0020] In a second aspect, the embodiments of the present application provide a battery monomer, which includes a shell, a pole, and the electrode assembly described above, the pole is arranged in the shell, the active material coating portion is accommodated in the shell, and the tab portion is electrically connected to the pole.

[0021] In the technical solution, the battery monomer adopts the electrode assembly described above, and the electrode assembly has good reliability and overcurrent capacity, so that the charge and discharge capacity and the reliability of the battery monomer are improved.

[0022] In some embodiments, the pole is formed with an accommodation groove, a part of the tab portion is accommodated in the accommodation groove, a side of the accommodation groove away from the active material coating portion is open, a side wall of the accommodation groove toward the active material coating portion is formed with a through hole communicating with the inside of the shell, and the tab portion is arranged in the through hole.

[0023] In the technical solution, a part of the tab portion is accommodated in the accommodation groove, so that the energy density of the battery monomer is improved, or in the case where the energy density of the battery monomer is unchanged, the size of the battery monomer is reduced, and the structural complexity and processing difficulty of the shell are reduced. In addition, the through hole also has a limiting effect on the tab portion.

[0024] In some embodiments, the battery monomer further includes a pole cover plate arranged on the pole and closing the slot opening of the accommodation groove.

[0025] In the technical solution, the pole cover plate closes the slot opening of the accommodation groove, so that the problem of leakage of electrolyte in the shell from the slot opening of the accommodation groove is improved. In addition, since the pole cover plate closes the slot opening of the accommodation groove and is electrically connected to the pole, the pole and the busbar component can be electrically connected by using the pole cover plate, the connection area at the electrical connection position is improved, and the overcurrent capacity is improved.

[0026] In a third aspect, the embodiments of the present application provide a battery including the battery monomer described above.

[0027] In the technical solution, the battery uses the battery monomer, and the battery monomer has good charge and discharge capacity and reliability, thereby improving the performance and reliability of the battery.

[0028] In a fourth aspect, the embodiments of the present application provide a power utilization device, which comprises the battery.

[0029] In the technical solution, the power utilization device uses the battery, and the battery has good performance and reliability, thereby improving the use performance and reliability of the power utilization device.

[0030] In a fifth aspect, the embodiments of the present application provide a processing method of an electrode assembly, which comprises: stacking and partially misaligning a plurality of connecting pieces connected with an active material coating part, the plurality of connecting pieces having overlapping parts and misaligned parts; dividing the misaligned parts into cutting regions and non-cutting regions, the non-cutting regions comprising a first connecting part and a second connecting part connected with each other and connected with the overlapping parts respectively, the first connecting part being connected with the active material coating part and the cutting regions respectively on both sides of the first connecting part in a first direction, the second connecting part being connected with the overlapping parts and the cutting regions respectively on both sides of the second connecting part in a second direction, the second direction intersecting the first direction; and cutting the cutting regions, so that the remaining parts of the plurality of connecting pieces form tab parts of the electrode assembly.

[0031] In the technical solution, the misaligned parts of the plurality of connecting pieces are divided into the cutting regions and the non-cutting regions, and the cutting regions are connected on the side of the first connecting part away from the active material coating part and on the side of the second connecting part away from the overlapping parts, so that after the cutting regions are cut, the remaining parts of the plurality of connecting pieces form the tab parts of the electrode assembly, thereby facilitating the width of one end of the tab part away from the active material coating part in the second direction to be less than the width of the other end of the tab part connected with the active material coating part in the second direction, thereby improving the arrangement capacity of the tab part and facilitating the assembly of the battery monomer while considering the overcurrent capacity and use reliability of the electrode assembly.

[0032] In some embodiments, the misaligned parts have a first cutting reference extending along the first direction and a second cutting reference extending along the second direction, the cutting regions comprise a plurality of first long strip-shaped regions and a plurality of second long strip-shaped regions, the plurality of first long strip-shaped regions and the plurality of second long strip-shaped regions are alternately arranged along the first direction or the second direction, the first long strip-shaped regions and the second long strip-shaped regions extend along the second direction or the first direction, and the cutting of the cutting regions comprises: cutting the plurality of first long strip-shaped regions based on the first cutting reference and the second cutting reference; and cutting the plurality of second long strip-shaped regions based on the first cutting reference and the second cutting reference.

[0033] In the technical solution, for the cutting area, the first plurality of long strip-shaped areas are cut based on the first cutting reference and the second cutting reference, and then the second plurality of long strip-shaped areas are cut based on the first cutting reference and the second cutting reference, so as to realize the cutting of the cutting area, and the cutting position of the cutting knife assembly is set based on the first cutting reference and the second cutting reference during the cutting process, thereby facilitating the effective control of the wire length of the first cutting reference and the second cutting reference of the plurality of connecting pieces after being cut, improving the problem that the long strip-shaped wires are prone to falling into or extending into other positions to cause short circuit.

[0034] In some embodiments, the cutting of the first plurality of long strip-shaped areas based on the first cutting reference and the second cutting reference includes that the adjacent two sides of the cutting knife assembly are aligned with the first cutting reference and the second cutting reference respectively; and the cutting of the second plurality of long strip-shaped areas based on the first cutting reference and the second cutting reference includes that the adjacent two side edges of the cutting knife assembly are aligned with the first reference line and the second reference line respectively, the first reference line corresponds to the inside of the cutting area and is apart from the first cutting reference by a first predetermined value a, and the second reference line corresponds to the outside of the cutting area and is apart from the second cutting reference by a second predetermined value b.

[0035] In the technical solution, during the cutting of the second plurality of long strip-shaped areas by the cutting knife assembly, the position of the cutting knife assembly is set so that the first side edge of the cutting knife assembly is aligned between the first reference line and the second reference line or aligned with the first reference line, and the second side edge of the cutting knife assembly is aligned with the third reference line, so as to realize the effective control of the wire length at the first cutting reference and the second cutting reference.

[0036] In some embodiments, each second long strip-shaped area includes a first sub-area and a second sub-area arranged in sequence along the length direction thereof, the second sub-area is located between the first cutting reference and the first reference line, the projection of the second sub-area along the stacking direction has an inscribed circle diameter d2≤2mm, and the stacking direction is perpendicular to the first direction and the second direction; and / or, a≤2mm; and / or, b≤2mm.

[0037] In the technical solution, the inscribed circle diameter d2≤2mm of the projection of the second sub-area along the third direction, and / or a≤2mm, and / or b≤2mm are set, so as to realize the effective control of the size of the part of the second sub-area remaining on the to-be-cut member, that is, the effective control of the wire length after cutting, and even if the entire second sub-area remains on the to-be-cut member, the risk of short circuit caused by the folding of the corresponding part of the second sub-area can also be reduced.

[0038] In a sixth aspect, the embodiments of the present application provide a cutting knife assembly, which is used for cutting a to-be-cut part to obtain an electrode assembly. The to-be-cut part includes an active material coated part and a to-be-cut part. The to-be-cut part is connected with the active material coated part. The to-be-cut part includes a plurality of connection pieces which are stacked and connected. The overlapping parts of the plurality of connection pieces form an overlapping area. The misaligned parts of the plurality of connection pieces include a cutting area and a non-cutting area. The non-cutting area includes a first connection part and a second connection part which are connected with each other and connected with the overlapping part respectively. The two sides of the first connection part in a first direction are connected with the active material coated part and the cutting area respectively. A second direction intersects the first direction. The cutting knife assembly includes a first cutting knife. The first cutting knife includes a plurality of first blades which are spaced apart along the first direction. Each first blade extends along the second direction. The first cutting knife is used for cutting at least part of the cutting area, so that the remaining parts of the plurality of connection pieces form a tab part. The tab part and the active material coated part form the electrode assembly.

[0039] In the above technical solution, the first cutting knife includes a plurality of first blades which are spaced apart. The first cutting knife is used for cutting at least part of the cutting area. The cutting knife assembly is used for cutting the cutting area, so that in the second direction, one end of the second connection part away from the overlapping area is closer to the overlapping area than one end of the first connection part away from the overlapping area. This improves the convenience of threading the tab part and improves the connection area of the tab part and the active material coated part, thereby facilitating the improvement of the battery cell assembly efficiency and the improvement of the overcurrent capacity.

[0040] In some embodiments, the cutting area includes a plurality of first long strip-shaped areas and a plurality of second long strip-shaped areas. The plurality of first long strip-shaped areas and the plurality of second long strip-shaped areas are alternately arranged along the first direction. The first long strip-shaped areas and the second long strip-shaped areas extend along the second direction. The first blades are used for cutting the first long strip-shaped areas and the second long strip-shaped areas in turn to form the tab part. The first blades include first cutting parts and first cutting tooth parts which are arranged in turn along the second direction. The first cutting tooth parts of the plurality of first blades are located at the same end of the plurality of first blades in the second direction.

[0041] In the above technical solution, the first blades include the first cutting parts and the first cutting tooth parts. The first cutting tooth parts of the plurality of first blades are located at the same end of the plurality of first blades. One end of the plurality of first cutting parts away from the first cutting tooth parts is fixedly connected, so that the plurality of first blades can synchronously cut the plurality of first long strip-shaped areas. At least one first blade can synchronously cut the plurality of second long strip-shaped areas. This facilitates the cutting of the entire cutting area by the first cutting knife and simplifies the structure of the cutting knife assembly.

[0042] In some embodiments, the length y1 of the first cutting tooth in the second direction is less than or equal to 2 mm; and / or, the spacing x3 between two adjacent first cutting teeth is less than or equal to 2 mm.

[0043] In the above technical solution, by setting the spacing x3 between two adjacent first cutting teeth to be less than or equal to 2 mm, and / or the length y1 of the first cutting tooth in the second direction to be less than or equal to 2 mm, when the cutting knife assembly cuts the plurality of second long strip-shaped regions, a suitable cutting position is selected based on the previous cutting position of the first cutting tooth, and the spacing x3 between two adjacent first cutting teeth and the length y1 of the first cutting tooth in the second direction both affect the size of the part of the second long strip-shaped region remaining on the cutting object, so as to effectively control the size of the part of the second long strip-shaped region remaining on the cutting object, thereby effectively controlling the length of the wire drawn after the cutting knife assembly cuts the cutting region, so as to control the length of the wire drawn within a reasonable range, so as to further improve the reliability and safety of the product.

[0044] In some embodiments, the first cutting tooth is triangular, and the maximum thickness t1 of the first blade is less than or equal to 1 mm; or, the first cutting tooth is square, and the maximum thickness t2 of the first blade is less than or equal to 0.71 mm; or, the first cutting tooth is trapezoidal, and the maximum thickness t3 of the first blade is less than or equal to 1 mm.

[0045] In the above technical solution, by setting the maximum thickness of the first blade when the first cutting tooth has different shapes, the thickness of the first blade is well matched with the shape of the first cutting tooth, so that the first blade has appropriate cutting ability, and the cutting reliability and accuracy of the cutting size control of the first blade are improved.

[0046] In some embodiments, the cutting region includes a plurality of first long strip-shaped regions and a plurality of second long strip-shaped regions, the plurality of first long strip-shaped regions and the plurality of second long strip-shaped regions are arranged alternately along the first direction, the first long strip-shaped regions and the second long strip-shaped regions extend along the second direction, the first cutting knife is used to cut the plurality of first long strip-shaped regions, and the cutting knife assembly further includes: a second cutting knife, the second cutting knife includes at least one second blade extending along the first direction, and the second cutting knife is used to cut the plurality of second long strip-shaped regions.

[0047] In the technical solution, the cutting knife assembly further includes the second cutting knife, the first cutting knife and the second cutting knife cut different areas of the cutting area respectively, which can simplify the cutting control of the first cutting knife and the second cutting knife, facilitate the first cutting knife to cut in the same posture and the second cutting knife to cut in the same posture, the first blade is arranged along a fixed direction, the second blade is arranged along a fixed direction, and the extension direction of the first blade intersects with the extension direction of the second blade, so that the posture of the first cutting knife and the second cutting knife during cutting need not to be frequently adjusted, and only the corresponding cutting knife needs to be replaced, thereby simplifying the cutting process.

[0048] In some embodiments, the second cutting knife includes two groups of blade sets, each group of blade sets includes at least one second blade, a plurality of second blades are arranged at intervals in the second direction, and the two groups of blade sets are respectively used for cutting the second long strip-shaped areas located on both sides of the overlap area in the second direction.

[0049] In the technical solution, the second cutting knife includes two groups of blade sets, and the two groups of blade sets are respectively used for cutting the second long strip-shaped areas located on both sides of the overlap area in the second direction, so that the two groups of blade sets are respectively used for cutting the cutting areas located on both sides of the overlap area in the second direction, thereby synchronously cutting the cutting areas on both sides of the overlap area and improving the processing efficiency of the electrode assembly.

[0050] In some embodiments, the distance between the two groups of blade sets is adjustable.

[0051] In the technical solution, the distance between the two groups of blade sets is adjustable, so that the second cutting knife can adapt to different distances between the two cutting areas when cutting the two cutting areas simultaneously, that is, adapt to different sizes of the tab part, whether the same cutting piece or different cutting pieces, thereby improving the operability and applicability of the second cutting knife when cutting the two cutting areas simultaneously. BRIEF DESCRIPTION OF DRAWINGS

[0052] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

[0053] Figure 1 A structural schematic diagram of a vehicle is provided for some embodiments of the present application;

[0054] Figure 2 An exploded view of a battery structure is provided for some embodiments of the present application;

[0055] Figure 3 A structural schematic diagram of a battery cell is provided for some embodiments of the present application;

[0056] Figure 4 A structural schematic diagram of a battery cell is provided for some embodiments of the present application; Figure 3A cross-sectional view of a battery cell as shown in FIG. 1 1 ;

[0057] Figure 5 A schematic view of an electrode assembly provided for some embodiments of the present application;

[0058] Figure 6 A schematic view of Figure 5 A partial schematic view of an electrode assembly as shown in FIG. 1 1 ;

[0059] Figure 7 A schematic view of Figure 6 A schematic view of a plurality of tab pieces of a tab portion as shown in FIG. 1 1 ;

[0060] Figure 8 A schematic view of a structure before cutting (a schematic view of a stack of a plurality of connecting pieces) provided for some embodiments of the present application;

[0061] Figure 9 A schematic view of a plurality of connecting pieces being cut by a first cutter as shown in FIG. 1 1 ; Figure 8

[0062] A schematic view of a plurality of connecting pieces after being cut by a first cutter as shown in FIG. 1 1 ; Figure 10 Figure 9 A schematic view of a plurality of connecting pieces being cut by a second cutter as shown in FIG. 1 1 ;

[0063] Figure 11 Figure 10 A schematic view of a structure after being cut by a second cutter as shown in FIG. 1 1 ; Figure 6

[0064] A schematic view of a structure after being cut by a second cutter as shown in FIG. 1 1 ; Figure 12

[0065] A schematic view of a processing method provided for some embodiments of the present application; Figure 13

[0066] A schematic view of a processing method provided for some embodiments of the present application; Figure 14

[0067] A schematic view of a processing method provided for some embodiments of the present application; Figure 15

[0068] A schematic view of a processing method provided for some embodiments of the present application; Figure 16

[0069] A schematic view of a processing method provided for some embodiments of the present application; Figure 17 Figure 16 A partial schematic view of a first cutter as shown in FIG. 1 1 ;

[0070] Figure 18 A partial schematic view of a first cutter as shown in FIG. 1 1 ;

[0071] ​​​Figure 19 A schematic view of a cutting knife assembly provided for some embodiments of the present application;

[0072] Figure 20 A schematic view of various embodiments of a cutting knife assembly provided for some embodiments of the present application;

[0073] Figure 21 A schematic view of a cutting knife assembly provided for some embodiments of the present application; Figure 20 A partial view of a second blade shown in (c);

[0074] Reference signs:

[0075] Electric device 1000, controller 300, motor 400, battery 200, battery cell 100, case 101, first case 1011, second case 1012, cutting device 500,

[0076] Cutting knife assembly 10, first reference line L1, second reference line L2, third reference line L3, first cutting knife 11, first blade 111, first cutting portion 1111, first cutting tooth portion 1112, second cutting knife 12, second blade 121, second cutting portion 1211, second cutting tooth portion 1212, pole 20, accommodating groove 20a, through hole 20b,

[0077] Electrode assembly 30, active material coating portion 31, tab portion 32, protruding portion 32a, sawtooth structure 32b, tab sheet 320, overlapping region 321, misaligned region 322, first groove 3220, first connecting portion 3221, second connecting portion 3222, connecting sheet 33, overlapping portion 331, misaligned portion 332, cutting region 3321, non-cutting region 3322,

[0078] Housing 40, first cutting reference 5a, second cutting reference 5b, first long strip-shaped region 51, second long strip-shaped region 52, first sub-region 521, second sub-region 522, pole cover plate 60. DETAILED DESCRIPTION

[0079] In order to make the objectives, 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 some but not all of 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 protection scope of the present application.

[0080] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms used in disclosing the application, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The articles 'a', 'an', and 'the' each followed by'some or more' or 'one or more' of an element are intended to include one or more articles of the described element and do not exclude other additional elements. The terms "comprises", "comprising", "includes", "including", "has", "having" and the like are inclusive and are used as equivalents of the term "consisting of".

[0081] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of other embodiments.

[0082] The term "and / or", in the application, merely describes an associated relationship of associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the application generally represents an "or" relationship between the front and rear associated objects.

[0083] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, detailed description of the same parts 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 application shown in the drawings, and the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the application.

[0084] "Multiple" appearing in the application means two or more (including two).

[0085] In the application, the battery cell can include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., which is not limited by the embodiments of the application. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc., which is also not limited by the embodiments of the application. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cell, square battery cell, and soft package battery cell, which is also not limited by the embodiments of the application.

[0086] The battery mentioned in the embodiments of the present application refers to a single physical module comprising a plurality of battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application can be a battery module or a battery pack, etc. The battery module generally comprises a plurality of battery cells. The battery generally comprises a box for packaging a plurality of battery cells or a plurality of battery modules, which can prevent liquid or other foreign matters from affecting the charging or discharging of the battery cells; of course, the battery can also not comprise a box.

[0087] Exemplarily, the battery cell generally can comprise a shell, an electrode assembly and an electrolyte, the shell is used to accommodate the electrode assembly and the electrolyte, and the shell is provided with at least one positive pole and at least one negative pole. The electrode assembly comprises one or more electrode assemblies, which are formed by stacking or winding positive pole sheets, negative pole sheets and separator films.

[0088] The positive pole sheet generally can comprise a positive current collector and a positive active material layer, the positive active material layer is directly or indirectly coated on the positive current collector, the positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer, the positive current collector without the positive active material layer serves as a positive tab sheet, and a plurality of positive tab sheets are stacked together and electrically connected to the positive pole. Exemplarily, the plurality of positive tab sheets stacked together can be directly welded to the positive pole to form an electrical connection; or the electrode assembly can further comprise a positive adapter sheet, the plurality of positive tab sheets stacked together are welded to one end of the positive adapter sheet, and the other end of the positive adapter sheet is welded to the positive pole, so that the positive tab sheet is electrically connected to the positive pole.

[0089] The negative pole sheet generally can comprise a negative current collector and a negative active material layer, the negative active material layer is directly or indirectly coated on the negative current collector, the negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer, the negative current collector without the negative active material layer serves as a negative tab sheet, and a plurality of negative tab sheets are stacked together and electrically connected to the negative pole. Exemplarily, the plurality of negative tab sheets stacked together can be directly welded to the negative pole to form an electrical connection; or the electrode assembly can further comprise a negative adapter sheet, the plurality of negative tab sheets stacked together are welded to one end of the negative adapter sheet, and the other end of the negative adapter sheet is welded to the negative pole, so that the negative tab sheet is electrically connected to the negative pole. The material of the separator film is not limited, for example, it can be polypropylene or polyethylene, etc.

[0090] The pressure relief structure on the battery cell mentioned in the present application is used to release the gas inside the battery cell when the internal pressure of the battery cell is too high (for example, due to overcharging, etc.), so as to reduce the internal pressure of the battery cell and prevent the battery cell from exploding due to too fast internal pressure increase. For example, the pressure relief structure can be an explosion-proof valve, an explosion-proof sheet, etc.

[0091] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, batteries, as the power source of electric vehicles, play an irreplaceable important role. Among them, the battery as a core component of new energy vehicles has higher requirements in terms of energy density and reliability.

[0092] In the related art, the battery includes a plurality of battery monomers. In some cases, in order to facilitate the connection of the tab portion of the battery monomer and the pole, the tab portion often needs to pass through the avoiding portion (such as a through hole) of other components (such as a pole); however, the tab portion is formed by laminating tab sheets, and the lamination position of the tab sheet can form a welding mark. The position of the tab sheet is relatively loose, which makes the loose tab portion easy to interfere with other components when passing through the avoiding portion of other components, affecting the reliability of the battery monomer.

[0093] Based on the above considerations, in order to improve the reliability of the battery monomer, an electrode assembly is provided, which includes an active material coating portion and a tab portion connected with the active material coating portion; the tab portion includes a plurality of tab sheets laminated and connected, the overlapping portions of the plurality of tab sheets form an overlapping region, and the misaligned portions of the plurality of tab sheets form a misaligned region connected with the overlapping region; wherein the misaligned region includes a first connecting portion and a second connecting portion, the first connecting portion is connected with the active material coating portion on one side along a first direction, and the second connecting portion is connected with the first connecting portion on the other side along the first direction; in a second direction, one end of the second connecting portion away from the overlapping region is closer to the overlapping region than one end of the first connecting portion away from the overlapping region, and the second direction intersects the first direction.

[0094] In the above technical solution, by setting the misaligned region of the plurality of tab sheets to include a first connecting portion and a second connecting portion, in the second direction, one end of the second connecting portion away from the overlapping region is closer to the overlapping region than one end of the first connecting portion away from the overlapping region, which facilitates the width of the tab portion corresponding to the position of the second connecting portion in the second direction to be smaller than the width of the tab portion corresponding to the position of the first connecting portion in the second direction, so as to fully utilize the misaligned region of the plurality of tab sheets, facilitate to increase the connection length of the tab portion and the active material coating portion, and improve the electrical connection area and connection reliability of the tab portion and the active material coating portion, which is beneficial to improve the use reliability and overcurrent capacity of the electrode assembly, thereby improving the use reliability of the battery monomer; at the same time, the width of the misaligned region at the end of the tab portion can be reduced. If the tab portion needs to pass through the avoiding portion (such as a through hole on the pole described later) of other components, such as a pole, the interference between the tab portion and other components, such as a pole, is reduced, which is beneficial to further improve the reliability of the battery monomer, and is beneficial to save the passing space required by the tab portion in the passing operation, thereby improving the passing convenience of the tab portion, and improving the assembly convenience and efficiency of the battery monomer.

[0095] The embodiments of the present application provide a power consumption device using the battery of the present application as a power supply. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like. The electric tool can include a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, an electric planer, and the like.

[0096] The following embodiments are described in detail with the power consumption device 1000 as an example of a vehicle for convenience of description.

[0097] Please refer to Figure 1 , Figure 1 The power consumption device 1000 provided by some embodiments of the present application is a structural schematic diagram of a vehicle. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile. The vehicle is provided with a battery 200. The battery 200 can be arranged at the bottom, the head, or the tail of the vehicle. The battery 200 can be used for power supply of the vehicle, for example, the battery 200 can be used as an operating power supply of the vehicle. The vehicle can further include a controller 300 and a motor 400. The controller 300 is used to control the battery 200 to supply power to the motor 400, for example, to meet the working power demand of the vehicle during starting, navigation, and driving. In some embodiments of the present application, the battery 200 can not only be used as an operating power supply of the vehicle, but also be used as a driving power supply of the vehicle, to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0098] Please refer to Figure 2 , Figure 2The battery monomer 100 provided for some embodiments of the present application is used in the structural explosion diagram of the battery 200. The battery 200 includes a box 101 and a plurality of battery monomers 100, and the battery monomers 100 are accommodated in the box 101. Among them, the box 101 is used to provide assembly space for the battery monomers 100, and the box 101 can adopt various structures. In some embodiments, the box 101 can include a first box 1011 and a second box 1012, the first box 1011 and the second box 1012 are overlapped with each other, and the first box 1011 and the second box 1012 jointly define an accommodation cavity for accommodating the battery monomers 100. The second box 1012 can be a hollow structure with one end open, and the first box 1011 can be a plate-shaped structure, which is overlapped with the open side of the second box 1012 to jointly define the accommodation cavity with the second box 1012; or, the first box 1011 and the second box 1012 can also be hollow structures with one side open (for example Figure 2 As shown), the open side of the first box 1011 is overlapped with the open side of the second box 1012. Of course, the box 101 formed by the first box 1011 and the second box 1012 can have various shapes, such as a cylinder, or a cuboid, etc.

[0099] In the battery 200, the plurality of battery monomers 100 can be connected in series, in parallel or in mixed connection, and the mixed connection means that there are both series connection and parallel connection among the plurality of battery monomers 100. The plurality of battery monomers 100 can be directly connected in series, in parallel or in mixed connection, and then the whole of the plurality of battery monomers 100 is accommodated in the box 101; or, the battery 200 can also be that the plurality of battery monomers 100 are first connected in series, in parallel or in mixed connection to form a battery module, and then a plurality of battery modules are connected in series, in parallel or in mixed connection to form a whole, and the whole is accommodated in the box 101. The battery 200 can also include other structures, for example, the battery 200 can also include a busbar for realizing the electrical connection between the plurality of battery monomers 100.

[0100] Please refer to Figure 3 and Figure 4In the embodiments of the present application, the battery cell 100 includes a shell 40, a pole 20 arranged in the shell 40, and an electrode assembly 30 including an active material coated portion 31 arranged in the shell 40 and a tab portion 32 connected to the active material coated portion 31, the tab portion 32 being electrically connected to the pole 20. Illustratively, the shell 40 has an accommodation cavity formed in the interior thereof, the active material coated portion 31 is accommodated in the accommodation cavity, the pole 20 is arranged in the shell 40, and the tab portion 32 is directly welded to the pole 20 or connected to the pole 20 through a jumper, so that the tab portion 32 is electrically connected between the active material coated portion 31 and the pole 20. Illustratively, the portion of the positive electrode tab having the positive active material layer (denoted as the positive electrode tab body), the separator, and the portion of the negative electrode tab having the negative active material layer (denoted as the negative electrode tab body) are sequentially stacked to form the active material coated portion 31 by winding or stacking.

[0101] The active material coated portion 31 can be divided into a positive active material coated portion and a negative active material coated portion, the positive active material coated portion including a portion of the positive current collector coated with the positive active material layer, and the negative active material coated portion including a portion of the negative current collector coated with the negative active material layer. The positive tab portion is electrically connected to the positive active material coated portion and the positive pole, and the negative tab portion is electrically connected to the negative active material coated portion and the negative pole.

[0102] Please refer to Figures 5-7 According to the electrode assembly 30 in some embodiments of the present application, the tab portion 32 includes a plurality of tab pieces 320, the plurality of tab pieces 320 are arranged in a stacked and connected manner, the overlapping portions of the plurality of tab pieces 320 form an overlapping region 321, the misaligned portions of the plurality of tab pieces 320 form a misaligned region 322, and the misaligned region 322 is connected to the overlapping region 321.

[0103] It can be understood that after the plurality of tab pieces 320 are arranged in a stacked manner, the plurality of tab pieces 320 have the misaligned region 322, which can be understood as a region in which the number of the tab pieces 320 arranged in a stacked manner is less than the total number of the tab pieces 320 of the tab portion 32, and the overlapping region 321 can be understood as a region in which the number of the tab pieces 320 arranged in a stacked manner is equal to the total number of the tab pieces 320 of the tab portion 32; in other words, along the thickness direction of the tab portion 32, the portion in which the projections of the plurality of tab pieces 320 completely overlap corresponds to the overlapping region 321, and the portion in which the projections of the plurality of tab pieces 320 do not completely overlap corresponds to the misaligned region 322. For example, Figure 6 The diagonal hatched region shown in the figure schematically represents the overlapping region 321, and the diagonal hatched region schematically represents the misaligned region 322.

[0104] The dislocation region 322 includes a first connecting part 3221 and a second connecting part 3222. The first connecting part 3221 is connected to the active material coating part 31 on one side in the first direction, and the second connecting part 3222 is connected to the first connecting part 3221 on the other side in the first direction. The second connecting part 3222 is connected to the side of the first connecting part 3221 away from the active material coating part 31 in the first direction. In the second direction intersecting the first direction, the end of the second connecting part 3222 away from the overlapping region 321 is closer to the overlapping region 321 than the end of the first connecting part 3221 away from the overlapping region 321.

[0105] As can be seen, in the above technical solution, the dislocation region 322 can be located on one side of the overlapping region 321 in the second direction. The first connecting part 3221 and the second connecting part 3222 are arranged in sequence in the first direction. In the second direction, the distance between the end of the second connecting part 3222 away from the overlapping region 321 and the overlapping region 321 is x2, and the distance between the end of the first connecting part 3221 away from the overlapping region 321 and the overlapping region 321 is x1. x2 < x1, which facilitates the width of the tab part 32 corresponding to the position of the second connecting part 3222 in the second direction being smaller than the width of the tab part 32 corresponding to the position of the first connecting part 3221 in the second direction. Then the tab part 32 can include a first part and a second part connected in the first direction. The first part can include a part of the overlapping region 321 and the first connecting part 3221, and the second part can include another part of the overlapping region 321 and the second connecting part 3222. In the second direction, the width of the second part is smaller than the width of the first part.

[0106] Since the second part is connected to the active material coating part 31, the dislocation regions 322 of the plurality of tab pieces 320 can be fully utilized to increase the connection length of the tab part 32 and the active material coating part 31, improve the electrical connection area and connection reliability of the tab part 32 and the active material coating part 31, and improve the use reliability and overcurrent capacity of the electrode assembly 30, thereby improving the use reliability of the battery monomer 100. When the electrode assembly 30 is used in the battery monomer 100, if the tab part 32 needs to pass through the avoiding part of other components (for example, the tab part 32 passes through the hole 20b on the pole 20 described later), the width of the second part is relatively small, which is beneficial to save the passing space required by the tab part 32 in the passing operation, to improve the passing convenience of the tab part 32, reduce the interference between the tab part 32 and the pole 20, improve the reliability of the battery monomer 100, and at the same time, improve the assembly convenience and efficiency of the battery monomer 100.

[0107] Exemplarily, the second direction is perpendicular to the first direction, taking the first direction as the front-rear direction and the second direction as the left-right direction as an example, the left side of the overlapping area 321 is provided with a misalignment area 322, the misalignment area 322 includes a first connecting part 3221 and a second connecting part 3222 which are sequentially connected along the front-rear direction, the front side of the first connecting part 3221 is connected with the active material coating part 31, the rear side of the first connecting part 3221 is connected with the second connecting part 3222, the right side of the first connecting part 3221 and the right side of the second connecting part 3222 are both connected with the overlapping area 321, and the distance between the left end of the second connecting part 3222 and the overlapping area 321 is less than the distance between the left end of the first connecting part 3221 and the overlapping area 321 in the left-right direction; it should be noted that the front-rear direction and the left-right direction corresponding to the first direction and the second direction described above are only for simplifying the description, and are not the corresponding directions of the electrode assembly 30 and the battery monomer 100 in the manufacturing, use, and the like. Of course, in other examples, the second direction can also form an arbitrary angle with the first direction other than a right angle.

[0108] Please refer to Figure 5 and Figure 6 In some embodiments, an end edge of the second connecting part 3222 away from the overlapping area 321 is in a sawtooth structure 32b; and / or, an end edge of the first connecting part 3221 away from the active material coating part 31 is in a sawtooth structure 32b.

[0109] In the above technical solution, by setting the end edge of the second connecting part 3222 away from the overlapping area 321 in a sawtooth structure 32b, and / or, the end edge of the first connecting part 3221 away from the active material coating part 31 in a sawtooth structure 32b, the length of the wire drawn on the edge of the tab part 32 is controlled by controlling the width of the sawtooth structure 32b, so as to improve the problem of short circuit caused by the long wire drawn on the edge of the tab part 32 falling into or extending into other positions to a certain extent, and improve the safety of the electrode assembly 30.

[0110] Please refer to Figure 6 In some embodiments, the sawtooth structure 32b includes a plurality of convex parts 32a sequentially arranged along the first direction. Wherein, the height h1 of the convex part 32a is ≤2mm; and / or, the diameter d1 of the circumscribed circle of the projection of the convex part 32a along the thickness direction of the tab part 32 is ≤2mm.

[0111] Optionally, h1 is 1mm, 1.2mm, 1.5mm, or 2mm, etc.; d1 is 1mm, 1.4mm, 1.73mm, or 2mm, etc.

[0112] In the technical solution, the height h1 of the protrusion 32a is less than or equal to 2 mm, and / or the diameter d1 of the circumscribed circle of the projection of the protrusion 32a along the thickness direction of the tab portion 32 is less than or equal to 2 mm, so as to effectively control the wire drawing length of the edge of the tab portion 32, and even if the entire zigzag structure 32b is folded, the risk of short circuit caused by the protrusion 32a can be reduced. The height of the protrusion 32a can be understood as the height of the protrusion 32a in the second direction.

[0113] Optionally, when d1 is less than or equal to 2 mm, the height and / or width of the protrusion 32a can be reasonably set, for example, the protrusion 32a is a trapezoid, the width of the protrusion 32a is less than or equal to 1.73 mm, and the height is less than or equal to 2 mm.

[0114] It can be understood that in the embodiments of the present application, the plurality of protrusions 32a of the zigzag structure 32b can be arranged at intervals (as shown in Figure 12 ), or the plurality of protrusions 32a can be arranged without intervals (as shown in Figure 6 ).

[0115] Please refer to the drawings, in some embodiments, the zigzag structure 32b includes a plurality of protrusions 32a arranged in sequence along the first direction, and the protrusion 32a is a square or a trapezoid.

[0116] In the technical solution, the protrusion 32a is set to be a square or a trapezoid, so as to simplify the shape of the protrusion 32a, facilitate processing, and facilitate reasonable control of the height, width and other dimensions of the protrusion 32a, which is conducive to further facilitating the control of the wire drawing length.

[0117] Please refer to Figure 6 , in some embodiments, when the edge of the second connecting portion 3222 forms the zigzag structure 32b, the first recess 3220 is formed at the position of the first connecting portion 3221 connected to the edge of the second connecting portion 3222 away from the overlapping area 321, then the first recess 3220 can be located at the side edge of the first connecting portion 3221 away from the active material coating portion 31, and the first recess 3220 is adjacent to the second connecting portion 3222.

[0118] In the technical solution, when the second connecting portion 3222 forms the zigzag structure 32b, the side edge of the first connecting portion 3221 away from the active material coating portion 31 is provided with the first recess 3220, the first recess 3220 can be formed by cutting, which is conducive to reducing the requirement for the position of the cutting knife in the first direction during the process of cutting to form the first recess 3220, and the cutting knife can also play a certain blocking role, which is conducive to improving the cutting balance and accuracy.

[0119] It can be understood that, in the second direction, the first groove 3220 can be spaced apart from the second connecting portion 3222, or the first groove 3220 and the second connecting portion 3222 are not spaced apart (as shown in Figure 6 Alternatively, the projection of the edge of the first groove 3220 in the thickness direction of the tab portion 32 can have an inscribed circle radius less than or equal to 2 mm, so as to further achieve effective control of the wire length of the edge of the tab portion 32, and even if the part at the first groove 3220 is entirely folded, the risk of short circuit can be reduced.

[0120] Alternatively, the first groove 3220 can be a triangular groove (as shown in Figure 6 , a square groove (as shown in Figure 12 , or a trapezoidal groove (as shown in Figure 12 , etc.

[0121] Exemplarily, when the first cutter 11 is used for cutting the plurality of second long strip-shaped areas 52, the first groove 3220 can be cut by the free end of the first blade 111 (for example, at least part of the first cutting tooth portion 1112); when the second cutter 12 is used for cutting the plurality of second long strip-shaped areas 52, the first groove 3220 can be cut by the free end of the second blade 121 (for example, at least part of the second cutting tooth portion 1212). Wherein, the depth of the first groove 3220 can also correspond to the distance between the second reference line L2 and the second cutting reference 5b, that is, the second predetermined value b.

[0122] In other embodiments, when the edge of the first connecting portion 3221 forms a sawtooth structure 32b, the second connecting portion 3222 forms a second groove at a position connected to the edge of the first connecting portion 3221 away from the active material coating portion 31, then the second groove can be located at the side edge of the second connecting portion 3222 away from the overlapping area 321, and the second groove is adjacent to the first connecting portion 3221.

[0123] In the above technical solution, when the first connecting portion 3221 forms a sawtooth structure 32b, by setting the second connecting portion 3222 to form a second groove at the side edge away from the overlapping area 321, the second groove can be cut, which is beneficial to reduce the position requirement of the cutting knife in the second direction during cutting to form the second groove, and at the same time, the cutting knife can be hindered to a certain extent, which is beneficial to improve the cutting balance and accuracy.

[0124] It can be understood that, in the first direction, the second groove can be spaced apart from the first connecting part 3221, or the second groove is not spaced apart from the first connecting part 3221. Optionally, the projection of the edge of the second groove in the thickness direction of the tab part 32 can be circumscribed by a circle with a radius of less than or equal to 2 mm, so as to further effectively control the length of the wire drawing of the edge of the tab part 32, and even if the part at the second groove is entirely folded, the risk of short circuit can be reduced.

[0125] Optionally, the second groove can be a triangular groove, a square groove, or a trapezoidal groove, etc.

[0126] In some embodiments, the first connecting part 3221 is not formed with the first groove 3220, and the second connecting part 3222 is not formed with the second groove.

[0127] For reference Figure 6 , in combination with Figures 8-11 In some embodiments, at least one of the edge of the first connecting part 3221 away from the active material coating part 31 and the edge of the second connecting part 3222 away from the overlapping area 321 is obtained by cutting, and at least one of the edge of the first connecting part 3221 away from the active material coating part 31 and the edge of the second connecting part 3222 away from the overlapping area 321 is configured as a cutting edge, that is, the edge of the first connecting part 3221 away from the active material coating part 31 and / or the edge of the second connecting part 3222 away from the overlapping area 321 is formed after cutting.

[0128] It can be seen that, if the edge of the first connecting part 3221 away from the active material coating part 31 is obtained by cutting, before cutting, the edge of the first connecting part 3221 away from the active material coating part 31 is connected to the area to be cut off (for example, the cutting area 3321 described below); if the edge of the second connecting part 3222 away from the overlapping area 321 is obtained by cutting, before cutting, the edge of the second connecting part 3222 away from the overlapping area 321 is connected to the area to be cut off (for example, the cutting area 3321 described below).

[0129] It can be understood that the edge of the first connecting part 3221 away from the active material coating part 31 and the edge of the second connecting part 3222 away from the overlapping area 321 can be obtained after the same cutting, or obtained after different cutting.

[0130] In the technical solution, the one end edge of the first connecting part 3221 away from the active material coating part 31 and / or the one end edge of the second connecting part 3222 away from the overlapping area 321 is obtained by cutting, which can effectively shorten the length of the wire drawing of the edge of the tab part 32 of the electrode assembly 30 after cutting processing, effectively improve the problem that the tab part 32 is prone to wire drawing after cutting, and to a certain extent, improve the problem of short circuit caused by wire drawing falling into or extending into other positions.

[0131] For example, the one end edge of the second connecting part 3222 away from the overlapping area 321 is in a sawtooth structure 32b, the sawtooth structure 32b is configured as a cutting edge, and the side edge of the first connecting part 3221 away from the active material coating part 31 is also configured as a cutting edge; if a first groove 3220 is formed at the position of the first connecting part 3221 connected with the one end edge of the second connecting part 3222 away from the overlapping area 321 at this time, the edge corresponding to the second groove is also configured as a cutting edge.

[0132] For reference Figure 6 In some embodiments, the overlapping area 321 is provided with one staggered area 322 on each side in the second direction, each staggered area 322 includes the first connecting part 3221 and the second connecting part 3222, and for each staggered area 322, the first connecting part 3221 is connected with the active material coating part 31, and the distance between the one end of the second connecting part 3222 away from the overlapping area 321 and the overlapping area 321 is less than the distance between the one end of the first connecting part 3221 away from the overlapping area 321 and the overlapping area 321, so that the width of the tab part 32 corresponding to the position of the second connecting part 3222 in the second direction is less than the width of the tab part 32 corresponding to the position of the first connecting part 3221 in the second direction.

[0133] For example, the staggered areas 322 on the two sides of the overlapping area 321 in the second direction can be arranged opposite to each other in the second direction, the first connecting parts 3221 of the two staggered areas 322 can be arranged opposite to each other in the second direction, and the first connecting parts 3221 of the two staggered areas 322 can be arranged opposite to each other in the second direction. Alternatively, the staggered areas 322 on the two sides of the overlapping area 321 can be symmetrically arranged, and of course, the staggered areas 322 on the two sides of the overlapping area 321 can also be asymmetrically arranged.

[0134] In the technical solution, the overlapping area 321 is provided with the staggered areas 322 on the opposite sides in the second direction, which is beneficial to further increase the connection length of the tab part 32 and the active material coating part 31, further improve the electrical connection area and connection reliability of the tab part 32 and the active material coating part 31, and further improve the use reliability and overcurrent capacity of the electrode assembly 30.

[0135] For example, the overlapping region 321 is provided with one staggered region 322 on each of the opposite sides in the second direction, each of the staggered regions 322 includes a first connecting part 3221 and a second connecting part 3222, and an end edge of each of the second connecting parts 3222 away from the overlapping region 321 is in a sawtooth structure 32b, and an end edge of each of the first connecting parts 3221 away from the active material coating part 31 is formed with a first groove 3220; or, an end edge of each of the first connecting parts 3221 away from the active material coating part 31 is in a sawtooth structure 32b, and a side edge of each of the second connecting parts 3222 away from the overlapping region 321 is formed with a second groove; or, in one of the staggered regions 322, an end edge of the first connecting part 3221 away from the active material coating part 31 is in a sawtooth structure 32b, and a side edge of the second connecting part 3222 away from the overlapping region 321 is formed with a second groove, and in the other of the staggered regions 322, an end edge of the second connecting part 3222 away from the overlapping region 321 is in a sawtooth structure 32b, and a side edge of the first connecting part 3221 away from the active material coating part 31 is formed with a first groove 3220.

[0136] For reference Figure 6 In some embodiments, the active material coating part 31 includes a positive electrode tab main body, a negative electrode tab main body, and a separator film, the plurality of tab pieces 320 are respectively connected to the positive electrode tab main body and the negative electrode tab main body, and the separator film is arranged between the positive electrode tab main body and the negative electrode tab main body, and the separator film exceeds the positive electrode tab main body and the negative electrode tab main body; wherein at least part of the first connecting part 3221 is shielded by the separator film, and the part of the separator film exceeding the positive electrode tab main body and the negative electrode tab main body shields at least part of the first connecting part 3221.

[0137] It can be seen that in the above technical solution, the tab piece 320 connected to the positive electrode tab main body can be formed as a positive electrode tab, and the tab piece 320 connected to the negative electrode tab main body can be formed as a negative electrode tab, in the first direction, the part of the separator film exceeding the positive electrode tab main body can shield at least part of the first connecting part 3221 of the positive electrode tab, and the part of the separator film exceeding the negative electrode tab main body can shield at least part of the first connecting part 3221 of the negative electrode tab.

[0138] In the above technical solution, by arranging the separator film to exceed the positive electrode tab main body and the negative electrode tab main body to shield at least part of the first connecting part 3221, at least part of the first connecting part 3221 shielded by the separator film can be insulated, so as to shorten the length of the first connecting part 3221 that can bypass the separator film to extend into other positions to cause short circuit, thereby further improving the safety of the electrode assembly 30.

[0139] For example, the isolation film covers the entire first connecting part 3221 to improve the insulation of the first connecting part 3221, so that even if a part of the first connecting part 3221 is folded, the short circuit problem can be improved; for another example, the isolation film covers a part of the first connecting part 3221, and the width of the part of the first connecting part 3221 exposed outside the isolation film in the first direction can be less than or equal to 2 mm, but is not limited thereto.

[0140] In some embodiments, the width h2 of the first connecting part 3221 in the first direction is greater than 1 mm. For example, h2 is 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, etc. Further, h2 is greater than 2 mm.

[0141] In the above technical solution, by setting the width h2 of the first connecting part 3221 to be greater than 1 mm, so that the interval between the cutting area 3321 and the current collector during cutting of the tab part 32 is greater than 1 mm, the problem that other components of the electrode assembly, such as the isolation film, etc., which are beyond the positive electrode tab body and the negative electrode tab body, are cut off together during cutting can be improved.

[0142] In a second aspect, the embodiments of the present application provide a battery monomer 100, which comprises a shell 40, a pole 20, and the above-mentioned electrode assembly 30. The pole 20 is arranged in the shell 40, the active material coating part 31 is accommodated in the shell 40, and the tab part 32 is electrically connected with the pole 20.

[0143] In the above technical solution, since the battery monomer 100 adopts the above-mentioned electrode assembly 30, and the electrode assembly 30 has good reliability and overcurrent capacity, the charging and discharging capacity and the reliability of the battery monomer 100 can be improved.

[0144] Optionally, the tab part 32 is directly electrically connected with the pole 20, or the tab part 32 is indirectly electrically connected with the pole 20 through a adapter sheet.

[0145] Please refer to Figure 4 In some embodiments, the pole 20 is formed with a receiving groove 20a, and a part of the tab part 32 is received in the receiving groove 20a, so that a part of the tab part 32 can occupy the space in the receiving groove 20a, thereby reducing the space occupation of the tab part 32 in the shell 40, saving the space in the shell 40 to accommodate a larger volume of the active material coating part 31, thereby facilitating the improvement of the energy density of the battery monomer 100, or facilitating the reduction of the size of the battery monomer 100 under the condition that the energy density of the battery monomer 100 is unchanged.

[0146] The side of the accommodation groove 20a away from the active material coating portion 31 is open, and the side of the accommodation groove 20a toward the active material coating portion 31 is formed with a through hole 20b in communication with the inside of the shell 40. The through hole 20b can penetrate the side groove wall of the accommodation groove 20a close to the active material coating portion 31, and the through hole 20b communicates the accommodation groove 20a and the inside space of the shell 40. The tab portion 32 is arranged in the through hole 20b.

[0147] Therefore, when the electrolyte is injected into the battery monomer 100, the electrolyte can be injected into the accommodation groove 20a, and then flow toward the inside of the shell 40 through the through hole 20b. The accommodation groove 20a can play a role of buffering the electrolyte, so as to improve the problems of splashing, overflowing and the like of the electrolyte. Moreover, the side wall of the accommodation groove 20a (i.e. the groove wall extending from the groove opening of the accommodation groove 20a toward the active material coating portion 31) can block the electrolyte from splashing to a certain extent, reduce the pollution caused by the electrolyte to the outside, and facilitate quick injection. Moreover, since it is not necessary to separately open an injection channel on the shell 40, it is not necessary to specially process the shell 40, which is conducive to reducing the structural complexity and processing difficulty of the shell 40. In addition, the through hole 20b can also play a certain limiting role on the tab portion 32.

[0148] It can be seen that, during the process of arranging the tab portion 32 in the through hole 20b when assembling the battery monomer 100, the end of the second connecting portion 3222 away from the first connecting portion 3221 and the end of the overlapping area 321 away from the active material coating portion 31 first extend into the through hole 20b. Since the width of the second connecting portion 3222 in the second direction is relatively smaller than that of the first connecting portion 3221, so as to make the width of the end of the tab portion 32 away from the active material coating portion 31 in the second direction smaller than that of the end of the tab portion 32 close to the active material coating portion 31 in the second direction, the convenience of arranging the tab portion 32 is improved.

[0149] It can be understood that the through hole 20b can be one or more, and the tab portion 32 can be arranged in at least one of the through holes 20b. For example, at least one of the through holes 20b can pass through the electrolyte, and at least one of the through holes 20b is empty (i.e. not arranged with the tab portion 32), so as to be able to pass through the electrolyte without being hindered by the tab portion 32. For another example, at least one of the through holes 20b can still pass through the electrolyte after the tab portion 32 is arranged therein.

[0150] Exemplarily, the portion of the tab 32 accommodated in the accommodation groove 20a is welded with the pole 20 to constitute an electrical connection, so as to realize the electrode output of the electrode assembly 30 from the pole 20. If the side of the accommodation groove 20a away from the active material coated portion 31 is open, the tab 32 is welded with the side groove wall of the accommodation groove 20a close to the active material coated portion 31, so that the compactness of the fit can be improved, and the welding operation of the two is facilitated. Of course, the electrical connection position of the tab 32 with the pole 20 is not limited to this, for example, the portion of the tab 32 penetrating in the through hole 20b is welded with the pole 20 to constitute an electrical connection. In other examples, the tab 32 can also be arranged to be welded with the pole cover plate 60 described below to form an electrical connection, which is not limited here.

[0151] Please refer to Figure 4 In some embodiments, the battery cell 100 further comprises a pole cover plate 60, which is arranged at the pole 20 and closes the slot opening of the accommodation groove 20a.

[0152] In the above technical solution, the slot opening of the accommodation groove 20a is closed by the pole cover plate 60, so as to improve the problem of leakage of the electrolyte in the housing 40 from the slot opening of the accommodation groove 20a. Moreover, since the pole cover plate 60 closes the slot opening of the accommodation groove 20a and is electrically connected with the pole 20, the pole 20 and the busbar component can be electrically connected by using the pole cover plate 60, which is conducive to improving the connection area at the electrical connection position and improving the overcurrent capacity.

[0153] Optionally, the pole cover plate 60 is formed with a liquid injection hole which can communicate with the accommodation groove 20a, and the battery cell 100 further comprises a sealing structure for plugging the liquid injection hole; or, a sealing member is arranged at the through hole 20b, so as to improve the problem of leakage of the electrolyte from the through hole.

[0154] In a third aspect, an embodiment of the present application provides a battery 200, comprising the battery cell 100 described above.

[0155] In the above technical solution, since the battery adopts the battery cell 100 described above, and the battery cell 100 has good charge and discharge capacity and reliability, the performance and reliability of the battery 200 are improved.

[0156] In a fourth aspect, an embodiment of the present application provides a power utilization device 1000, comprising the battery 200 described above, and the battery 200 is used to provide electric energy.

[0157] In the above technical solution, since the power utilization device 1000 adopts the battery 200 described above, and the battery 200 has good performance and reliability, the use performance and use reliability of the power utilization device 1000 are improved.

[0158] In a fifth aspect, an embodiment of the present application provides a processing method of the electrode assembly 30, such asFigures 13-15 As shown, the plurality of connecting pieces 33 are arranged in a stack and partially misaligned, and the plurality of connecting pieces 33 have overlapping portions 331 and misaligned portions 332. The misaligned portions 332 are divided into cut regions 3321 and non-cut regions 3322, and the non-cut regions 3322 include a first connecting portion 3221 and a second connecting portion 3222 connected to each other and connected to the overlapping portions respectively, the first connecting portion 3221 is connected to the active material coated portion 31 and the cut region 3321 respectively on both sides in the first direction, the second connecting portion 3222 is connected to the overlapping portion 331 and the cut region 3321 respectively on both sides in the second direction, and the second direction intersects the first direction. The cut region 3321 is cut off, so that the remaining part of the plurality of connecting pieces 33 forms the tab portion 32 of the electrode assembly 30.

[0159] Obviously, after the plurality of connecting pieces 33 are cut as described above, the remaining part of each connecting piece 33 forms the tab piece 320, and the misaligned portion 332 corresponds to the misaligned region 322 described above, and the overlapping portion 331 corresponds to the overlapping region 321 described above.

[0160] As can be seen, in the first direction, the first connecting portion 3221 is located between the cut region 3321 and the active material coated portion 31, in the second direction, the second connecting portion 3222 is located between the cut region 3321 and the overlapping portion 331, and in the second direction, the end of the second connecting portion 3222 away from the overlapping region 321 is closer to the overlapping region 321 than the end of the first connecting portion 3221 away from the overlapping region 321.

[0161] It can be understood that after the plurality of connecting pieces 33 are arranged in a stack, the plurality of connecting pieces 33 have misaligned portions 332, which can be understood as the number of connecting pieces 33 arranged in a stack in this part is less than the total number of connecting pieces 33, and the overlapping portion 331 can be understood as the number of connecting pieces 33 arranged in a stack in this part is equal to the total number of connecting pieces 33; in other words, along the stacking direction, the part where the projections of the plurality of connecting pieces 33 completely overlap corresponds to the overlapping portion 331, and the part where the projections of the plurality of connecting pieces 33 do not completely overlap corresponds to the misaligned portion 332.

[0162] In the technical solution, the misaligned portions of the plurality of connecting pieces 33 are divided into cutting regions 3321 and non-cutting regions 3322, and the cutting regions 3321 are connected to the side of the first connecting portion 3221 away from the active material coating portion 31 and to the side of the second connecting portion 3222 away from the overlapping portion, so that after the cutting regions 3321 are cut off, the remaining portions of the plurality of connecting pieces 33 form the tab portion 32 of the electrode assembly 30. This facilitates the width of the end of the tab portion 32 away from the active material coating portion 31 in the second direction being less than the width of the end of the tab portion 32 connected to the active material coating portion 31 in the second direction, thereby improving the arrangement capability of the tab portion 32 and facilitating the assembly of the battery monomer 100 while considering the overcurrent capacity and use reliability of the electrode assembly 30.

[0163] Please refer to Figure 5 、 Figures 8-11 In some embodiments, the misaligned portion 332 has a first cutting reference 5a extending in the first direction and a second cutting reference 5b extending in the second direction, the cutting region 3321 includes a plurality of first long strip-shaped regions 51 and a plurality of second long strip-shaped regions 52, the plurality of first long strip-shaped regions 51 and the plurality of second long strip-shaped regions 52 are alternately arranged along the first direction or the second direction, and the first long strip-shaped regions 51 and the second long strip-shaped regions 52 extend along the second direction or the first direction. It can be seen that the cutting region 3321 has the following two different arrangement modes: 1. The plurality of first long strip-shaped regions 51 and the plurality of second long strip-shaped regions 52 are alternately arranged along the first direction, and the first long strip-shaped regions 51 and the second long strip-shaped regions 52 extend along the second direction; 2. The plurality of first long strip-shaped regions 51 and the plurality of second long strip-shaped regions 52 are alternately arranged along the second direction, and the first long strip-shaped regions 51 and the second long strip-shaped regions 52 extend along the first direction.

[0164] Cutting off the cutting region 3321 includes cutting off the plurality of first long strip-shaped regions 51 based on the first cutting reference 5a and the second cutting reference 5b, and cutting off the plurality of second long strip-shaped regions 52 based on the first cutting reference 5a and the second cutting reference 5b.

[0165] It can be seen that in the above cutting process, whether the first long strip-shaped regions 51 are cut or the second long strip-shaped regions 52 are cut, the cutting positions are based on the first cutting reference 5a and the second cutting reference 5b.

[0166] In the technical solution, for the cutting area 3321, the first plurality of long strip-shaped areas 51 are cut based on the first cutting reference 5a and the second cutting reference 5b, and then the second plurality of long strip-shaped areas 52 are cut based on the first cutting reference 5a and the second cutting reference 5b, so as to cut the cutting area 3321, and the cutting position of the cutting knife assembly 10 during the cutting is set based on the first cutting reference 5a and the second cutting reference 5b, which facilitates effective control of the wire length of the first cutting reference 5a and the second cutting reference 5b of the plurality of connecting pieces 33 after being cut, so as to improve the problem that the long strip-shaped wire is prone to falling into or extending into other positions to cause short circuit.

[0167] Optionally, the cutting knife for cutting the first plurality of long strip-shaped areas 51 and the cutting knife for cutting the second plurality of long strip-shaped areas 52 can be the same cutting knife or different cutting knives.

[0168] In some embodiments, the cutting knife assembly 10 includes a first cutting knife 11, and the first cutting knife 11 includes a plurality of first blades 111 arranged at intervals; and the cutting method includes: the plurality of first blades 111 cut the first plurality of long strip-shaped areas 51 respectively, and at least one first blade 111 located at the edge of the first cutting knife 11 cuts the second plurality of long strip-shaped areas 52.

[0169] For example, each first long strip-shaped area 51 is cut by a corresponding first blade 111, and during the cutting, the width side of the outermost one of the plurality of first blades 111 in the first direction can be aligned with the second cutting reference 5b, and the end of the plurality of first blades 111 in the second direction can be aligned with the first cutting reference 5a; after the plurality of first long strip-shaped areas 51 are cut, the width side of the outermost one of the plurality of first blades 111 can be cut with the first cutting reference 5a as a reference to cut the second plurality of long strip-shaped areas 52 at the same time. Obviously, during the above-mentioned two cutting processes, the arrangement posture of the first cutting knife 11 changes, and the length end of the first blade 111 can be aligned with the first cutting reference 5a when cutting the first plurality of long strip-shaped areas 51, and the length end of the first blade 111 can be aligned with the second cutting reference 5b when cutting the second plurality of long strip-shaped areas 52.

[0170] In the technical solution, the first cutting knife 11 can cut the first plurality of long strip-shaped areas 51 and the second plurality of long strip-shaped areas 52, which facilitates simplification of the structure of the cutting knife assembly 10 under the premise of shortening the wire length at the cutting reference of the cutting area 3321.

[0171] Please refer to Figures 8-11In some embodiments, the cutting knife assembly 10 comprises a first cutting knife 11 and a second cutting knife 12, the first cutting knife 11 comprises a plurality of first blades 111 arranged at intervals, and the second cutting knife 12 comprises at least one second blade 121; the cutting method comprises: the plurality of first blades 111 respectively cut a plurality of first long strip-shaped regions 51, and the at least one second blade 121 cuts a plurality of second long strip-shaped regions 52.

[0172] For example, each first long strip-shaped region 51 is cut by a corresponding first blade 111, and in the cutting process, the plurality of first blades 111 can be aligned with the second cutting reference 5b on the side of the width of the outermost one in the first direction, and the end of the plurality of first blades 111 can be aligned with the first cutting reference 5a in the second direction; after the plurality of first long strip-shaped regions 51 are cut, the second blade 121 of the outermost one of the second cutting knife 12 can be cut on the side of the width with the first cutting reference 5a as the reference to cut the plurality of second long strip-shaped regions 52 at the same time. Obviously, in the cutting of the plurality of first long strip-shaped regions 51, the length end of the first blade 111 can be aligned with the first cutting reference 5a, and in the cutting of the plurality of second long strip-shaped regions 52, the above length end of the second blade 121 can be aligned with the second cutting reference 5b as the reference.

[0173] In the above technical solution, the first cutting knife 11 is used to cut the plurality of first long strip-shaped regions 51, and the second cutting knife 12 is used to cut the plurality of second long strip-shaped regions 52, so that the cutting arrangement posture of the first cutting knife 11 and the cutting arrangement posture of the second cutting knife 12 do not need to be frequently adjusted, which is beneficial to simplify the cutting process.

[0174] It can be understood that when the second cutting knife 12 comprises one second blade 121, the second blade 121 can be aligned with the first cutting reference 5a for cutting; when the second cutting knife 12 comprises a plurality of second blades 121, the plurality of second blades 121 can be arranged at intervals along the second direction, and the outermost one of the plurality of second blades 121 can be aligned with the first cutting reference 5a for cutting.

[0175] For reference Figures 8-11 In some embodiments, the cutting of the plurality of first long strip-shaped regions 51 based on the first cutting reference 5a and the second cutting reference 5b comprises: the adjacent two sides of the cutting knife assembly 10 are respectively aligned with the first cutting reference 5a and the second cutting reference 5b.

[0176] Based on the first cutting reference 5a and the second cutting reference 5b, multiple second long strip areas 52 are cut, including: the adjacent two sides of the cutting knife assembly 10 are aligned with the first reference line L1 and the second reference line L2 respectively, the first reference line L1 corresponds to the inner side of the cutting area 3321 and is at a first predetermined value a away from the first cutting reference 5a, and the second reference line L2 corresponds to the outer side of the cutting area 3321 and is at a second predetermined value b away from the second cutting reference 5b.

[0177] It can be seen that the cutting knife assembly 10 can cut off a part of each second long strip area 52, and the remaining part of each second long strip area 52 corresponds to the drawing at the first cutting reference 5a; moreover, after cutting off multiple first long strip areas 51, the cutting knife assembly 10 can cut off a part of the second cutting reference 5b to change the edge shape of the position, or it can not change the interference with the second cutting reference 5b during the cutting process so that the edge shape of the position does not change.

[0178] In the above technical solution, during the process of the cutting knife assembly 10 cutting the multiple second long strip areas 52, by setting the position of the cutting knife assembly 10, the first side edge of the cutting knife assembly 10 is aligned between the first reference line L1 and the second reference line L2, or aligned with the first reference line L1, and the second side edge of the cutting knife assembly 10 is aligned with the third reference line L3, so as to achieve effective control of the drawing length at the first cutting reference 5a and the second cutting reference 5b.

[0179] It is understandable that the first predetermined value a and the second predetermined value b can be specifically set according to the drawing length requirement; for example, if the drawing length does not exceed 2 mm, the first predetermined value a and the second predetermined value b can both be less than or equal to 2 mm.

[0180] The following is an example of the first cutter 11 cutting multiple first long strip areas 51 and the second cutter 12 cutting multiple second long strip areas 52. After reading the following description, those skilled in the art will easily understand the implementation plan of cutting multiple first long strip areas 51 and multiple second long strip areas 52 with the first cutter 11.

[0181] like Figures 8-11 As shown, the cutting area 3321 is roughly a square area, the first cutting reference 5a and the second cutting reference 5b are perpendicular, and the edge opposite to the first cutting reference 5a and the edge opposite to the second cutting reference 5b in the cutting area 3321 are free end edges respectively; the first cutting reference 5a extends in the left-right direction, and the second cutting reference 5b extends in the front-back direction.

[0182] When the first cutter 11 cuts the plurality of first long strip-shaped regions 51, the front side edge of the frontmost one of the plurality of first blades 111 is aligned with the second cutting reference 5b, and the free end of the plurality of first blades 111 in the length direction is aligned with the first cutting reference 5a in the left-right direction, so as to cut the plurality of first long strip-shaped regions 51; after the plurality of first long strip-shaped regions 51 are cut, the corresponding second blade 121 of the second cutter 12 can be aligned with the first reference line L1 on the width side, and the free end of the second blade 121 in the length direction can be aligned with the second reference line L2, so as to cut the plurality of second long strip-shaped regions 52 at the same time. Obviously, after the cutting region 3321 is cut, the first predetermined value and the second predetermined value are related to the product wire length.

[0183] Please refer to Figure 10 and Figure 11 In some embodiments, each second long strip-shaped region 52 comprises a first sub-region 521 and a second sub-region 522 arranged in sequence along the length direction thereof, and the second sub-region 522 is located between the first cutting reference 5a and the first reference line L1, that is, the opposite two side edges of the second sub-region 522 are located on the first cutting reference 5a and the first reference line L1 respectively. Wherein, the projection of the second sub-region 522 in the stacking direction has an inscribed circle diameter d2≤2mm, and the stacking direction is perpendicular to the first direction and the second direction respectively; and / or, a≤2mm; and / or, b≤2mm.

[0184] In the above technical solution, by setting the inscribed circle diameter d2≤2mm of the projection of the second sub-region 522 in the third direction, and / or a≤2mm, and / or b≤2mm, the size of the part of the second sub-region 522 retained on the to-be-cut member is effectively controlled, that is, the wire length after cutting is effectively controlled, and even if the entire second sub-region 522 is retained on the to-be-cut member, the risk of short circuit caused by folding of the corresponding part of the second sub-region 522 can be reduced.

[0185] Optionally, d2 is 2mm, 1.73mm, 1.5mm, 1.2mm, 1mm, or 0.9mm, etc.; a is 2mm, 1.8mm, 1.5mm, 1.3mm, 1mm, 0.8mm, etc.; b is 2mm, 1.9mm, 1.5mm, 1.2mm, 1mm, or 0.9mm, etc. In addition, a and b can also be 0.

[0186] It can be understood that the electrode assembly 30 in the embodiments of the present application can be processed by using the processing method in the embodiments of the present application; the processing method in the embodiments of the present application can be implemented by using the cutting knife assembly 10 in the embodiments of the present application.

[0187] It can be seen that, in the embodiment of the present application, the plurality of connecting pieces 33 are cut to form the tab portion 32, so as to reduce the dislocation area of the plurality of tab pieces 320, and at the same time, the remaining dislocation area after cutting can be used to improve the connection reliability and flow capacity of the tab portion 32 and the active material coating portion 31, and reduce the adverse effects of excessive dislocation of the tab pieces 320 on subsequent processes.

[0188] It can be understood that, when the tab portion 32 is cut by the above processing method, if the second connecting portion 3222 is formed with the sawtooth structure 32b, the first cutting reference 5a is arranged corresponding to the second connecting portion 3222, and the second cutting reference 5b is arranged corresponding to the first connecting portion 3221, at this time, the first cutting reference 5a can be the edge of the second connecting portion 3222 away from the overlapping area 321, or the first cutting reference 5a can be arranged at an interval from the above edge of the second connecting portion 3222 (as shown in Figure 6 ). Alternatively, the interval between the first cutting reference 5a and the edge of the second connecting portion 3222 is less than or equal to 1 mm, for example, the interval can be 0.9 mm, 0.94 mm, or 0.98 mm, etc. If the first connecting portion 3221 is formed with the sawtooth structure 32b, the first cutting reference 5a is arranged corresponding to the first connecting portion 3221, and the second cutting reference 5b is arranged corresponding to the second connecting portion 3222, at this time, the first cutting reference 5a can be the edge of the first connecting portion 3221 away from the active material coating portion 31, or the first cutting reference 5a can be arranged at an interval from the above edge of the first connecting portion 3221.

[0189] In a sixth aspect, an embodiment of the present application provides a cutting knife assembly, please refer to Figures 16-20 The cutting knife assembly 10 is used for cutting the cutting area 3321 of the to-be-cut part to obtain the electrode assembly 30.

[0190] The to-be-cut part includes the active material coating portion 31 and a to-be-cut portion, the to-be-cut portion is connected with the active material coating portion 31, and the to-be-cut portion includes a plurality of connecting pieces 33 which are stacked and connected, the plurality of connecting pieces 33 are partially dislocated, so that the plurality of connecting pieces 33 have overlapping portions 331 and dislocation portions 332; the overlapping portions 331 of the plurality of connecting pieces 33 form an overlapping area 321, and the dislocation portions 332 of the plurality of connecting pieces 33 include a cutting area 3321 and a non-cutting area 3322, the non-cutting area 3322 includes a first connecting portion 3221 and a second connecting portion 3222 which are connected with each other and respectively connected with the overlapping portions 331, the first connecting portion 3221 is connected with the active material coating portion 31 and the cutting area 3321 on both sides in a first direction respectively, the second connecting portion 3222 is connected with the overlapping portions 331 and the cutting area 3321 on both sides in a second direction respectively, and the second direction intersects the first direction.

[0191] The cutting knife assembly 10 comprises a first cutting knife 11, the first cutting knife 11 comprising a plurality of first blades 111 arranged at intervals in a first direction, each first blade 111 extending in a second direction. The first cutting knife 11 is configured to cut at least part of the cutting region 3321, so that the remaining part of the plurality of connecting pieces 33 forms the tab portion 32, and the tab portion 32 and the active material coating portion 31 form the electrode assembly 30.

[0192] It can be seen that, in the process of cutting the cutting knife assembly 10 to obtain the electrode assembly 30, the first cutting knife 11 can be used to cut the entire cutting region 3321, or the first cutting knife 11 can be used to cut part of the cutting region 3321, and other parts of the cutting knife assembly 10 (for example, the second cutting knife 12 described below) can be used to cut another part of the cutting region 3321.

[0193] In the above technical solution, by arranging the first cutting knife 11 to comprise a plurality of first blades 111 arranged at intervals, and by configuring the first cutting knife 11 to cut at least part of the cutting region 3321, and by configuring the cutting knife assembly 10 to cut the cutting region 3321, so that in the second direction, the end of the second connecting portion 3222 away from the overlapping region 321 is closer to the overlapping region 321 than the end of the first connecting portion 3221 away from the overlapping region 321, the convenience of threading the tab portion 32 is improved, and the connection area between the tab portion 32 and the active material coating portion 31 is increased, thereby facilitating the improvement of the assembly efficiency of the battery monomer 100 and the improvement of the overcurrent capacity.

[0194] In addition, whether the first cutting knife 11 is used to cut the entire cutting region 3321 or the first cutting knife 11 is used to cut part of the cutting region 3321, the entire cutting region 3321 needs to be cut multiple times to be cut off. Since the first cutting knife 11 comprises a plurality of first blades 111 arranged at intervals, the problem of long wire drawing at the cutting edge is improved.

[0195] For example, when the first cutter 11 is used to cut the cutting area 3321, the first cutter 11 can punch the cutting area 3321 in a direction perpendicular to the cutting area 3321, for example, the first cutter 11 punches in the thickness direction of the to-be-cut piece, and the part of the cutting area 3321 aligned with each first blade 111 is punched by the first cutter 11, while the part of the cutting area 3321 aligned with the gap between the adjacent two first blades 111 is not punched by the first cutter 11, so that after the first cutter 11 punches the cutting area 3321 once, a part of the cutting area 3321 can be cut off, and at this time, the cut-off part can include a plurality of first long strip-shaped areas 51 arranged at intervals in the first direction, and the remaining part of the cutting area 3321 can include a plurality of second long strip-shaped areas 52 arranged at intervals in the first direction; then, the cutting knife assembly 10 can be used to cut the remaining part of the cutting area 3321, so as to cut off at least part of each second long strip-shaped area 52, so as to effectively shorten the length of the long strip after the to-be-cut piece is cut, thereby effectively improving the problem that the to-be-cut piece is prone to produce long strips after being cut, and to some extent, improving the problem that the to-be-cut piece cannot be used normally due to the long strip falling into or extending into other positions. The direction perpendicular to the cutting area 3321 can be perpendicular to the first direction and the second direction, respectively.

[0196] For example, the to-be-cut piece is a tab, and in some technologies, a flat knife is used to cut the tab. Due to the existence of a certain gap in the flat knife edge, the cutting is prone to produce long strips, which leads to the risk that the long strips easily extend into the electrode assembly of the battery monomer, and the risk of short circuit of the tab. Moreover, the gap of the flat knife edge will gradually increase during use, which leads to the problem that the cutting is more prone to produce long strips. In the embodiment of the present application, the cutting knife assembly 10 is provided, which includes the first cutter 11, and the first cutter 11 includes a plurality of first blades 111 arranged at intervals in the first direction, and each first blade 111 extends in the second direction. The first long strip-shaped areas 51 and the second long strip-shaped areas 52 of the to-be-cut area 3321 can be cut in sequence, so as to effectively shorten the length of the part of the second long strip-shaped areas 52 remaining on the to-be-cut piece, thereby shortening the length of the long strip when the tab part 32 is cut, effectively reducing the risk of short circuit of the tab caused by the long strip easily extending into the electrode assembly due to the long length, and improving the reliability and safety of the electrode assembly.

[0197] Exemplarily, the first direction is perpendicular to the second direction, the first cutter 11 punches the cutting area 3321 in a direction perpendicular to the cutting area 3321 to cut off a part of the cutting area 3321, at this time, the cut-off part can include a plurality of first long strip-shaped areas 51 arranged at intervals, and the remaining part of the cutting area 3321 is a plurality of second long strip-shaped areas 52 arranged at intervals; then, the first cutter 11 can be used again to cut the remaining part of the cutting area 3321, so as to cut off the plurality of second long strip-shaped areas 52. Obviously, the placement posture of the first cutter 11 needs to be adjusted during the above-mentioned second cutting, for example, the two adjacent cutting reference lines of the cutting area 3321 are respectively the first cutting reference line 5a and the second cutting reference line 5b, and the two are perpendicular, the end of the plurality of first blades 111 of the first cutter 11 can correspond to the first cutting reference line 5a during the first cutting, the plurality of first blades 111 are arranged at intervals in the front-rear direction, and each first blade 111 extends in the left-right direction, the end of the plurality of first blades 111 of the first cutter 11 can correspond to the second cutting reference line 5b during the second cutting, the plurality of first blades 111 are arranged at intervals in the left-right direction, and each first blade 111 extends in the front-rear direction, that is, the first cutter 11 can be rotated by 90° around the vertical direction; it can be seen that the above-mentioned setting can effectively control the wire drawing length at least at the first cutting reference line 5a.

[0198] Of course, the two adjacent cutting reference lines of the cutting area 3321 can also be an acute angle or an obtuse angle, and the first cutter 11 can be rotated by a corresponding angle around the vertical direction during the two cuttings.

[0199] Of course, in other examples, after the first cutter 11 sequentially cuts the cutting area 3321, other components of the cutting knife assembly 10 except the first cutter 11, such as the second cutter 12 described below, can be used to cut the cutting area 3321 again, and it is not limited to always using the first cutter 11 for cutting. That is, the first cutter 11 can be used throughout the process of cutting the cutting area 3321, or the first cutter 11 can be used in cooperation with other cutting parts of the cutting knife assembly 10 to cut the cutting area 3321. In addition, the included angle between the first direction and the second direction can also be any non-zero angle other than 90°.

[0200] It can be understood that when the first cutter 11 cuts the cutting area 3321, at least part of all the first blades 111 in the first cutter 11 is used to implement the cutting. In the embodiment of the present application, the cutting knife assembly 10 cuts the cutting area 3321 at least twice. In the following description of the present application, in order to simplify the description, the case of cutting the cutting area 3321 twice by the cutting knife assembly 10 is described as an example, and those skilled in the art can easily understand the implementation scheme of cutting the cutting area 3321 more than twice by the cutting knife assembly 10 after reading the following scheme.

[0201] In the above technical scheme, by setting the cutting knife assembly 10 to include the first cutter 11, and the first cutter 11 including a plurality of first blades 111 spaced apart along the first direction, each first blade 111 extending along the second direction, the cutting area 3321 is cut by the cutting knife assembly 10 multiple times, and in the adjacent two cutting processes, the second cutting can cut the length of the part of the long strip-shaped part remaining on the cutting piece after the first cutting is not cut off, thereby effectively shortening the length of the long strip after the cutting piece is cut, effectively improving the problem that the cutting piece is easy to produce long strip after being cut, to a certain extent. Improve the problem that the cutting piece cannot be normally used due to the long strip falling into or extending into other positions, and improve the reliability of the product.

[0202] Please refer to Figures 16-19 In some embodiments, the cutting area 3321 includes a plurality of first long strip-shaped areas 51 and a plurality of second long strip-shaped areas 52, the plurality of first long strip-shaped areas 51 and the plurality of second long strip-shaped areas 52 are alternately arranged along the first direction, and the first long strip-shaped area 51 and the second long strip-shaped area 52 extend along the second direction; the first blade 111 is used to cut the first long strip-shaped area 51 and the second long strip-shaped area 52 in turn to form the tab part 32; wherein the first blade 111 includes a first cutting part 1111 and a first cutting tooth part 1112 arranged in turn along the second direction, the first cutting tooth parts 1112 of the plurality of first blades 111 are located at the same end of the plurality of first blades 111 in the second direction, and the ends of the plurality of first cutting parts 1111 away from the first cutting tooth part 1112 are fixedly connected.

[0203] For example, the first direction is perpendicular to the second direction, the first cutter 11 first punches the plurality of first long strip-shaped regions 51 in a direction perpendicular to the cutting region 3321 to cut off the plurality of first long strip-shaped regions 51, and then punches the plurality of second long strip-shaped regions 52 again by using the first cutter 11, so as to realize the cutting of the entire cutting region 3321. Obviously, the placement posture of the first cutter 11 needs to be adjusted during the above-mentioned second cutting. For example, the plurality of first blades 111 extend along the second direction during the first cutting, and the plurality of first blades 111 are adjusted to extend along the first direction during the second cutting, that is, the first cutter 11 can be rotated by 90° around the vertical direction. During the second cutting, the outermost first blade 111 can be arranged corresponding to one end of the plurality of second long strip-shaped regions 52 connected with the overlapping region 321, so as to cut off the plurality of second long strip-shaped regions 52 simultaneously by at least one first blade 111.

[0204] It can be seen that the first cutting tooth part 1112 is located at the free end of the first blade 111, and the first cutting part 1111 and the first cutting tooth part 1112 can cut different parts when the first blade 111 is used for cutting. For example, the second direction is the left-right direction, for each first blade 111, the first cutting tooth part 1112 is located at the right end of the first blade 111, at this time, the plurality of first blades 111 are fixedly connected by the left ends to form an integral whole, so as to realize the synchronous cutting of the plurality of first blades 111; of course, the first cutting tooth part 1112 can also be located at the left end of the first blade 111.

[0205] In the above technical solution, by setting the first blade 111 to include the first cutting part 1111 and the first cutting tooth part 1112, and arranging the plurality of first cutting tooth parts 1112 at the same end of the plurality of first blades 111, and fixing the ends of the plurality of first cutting parts 1111 away from the first cutting tooth part 1112, the synchronous cutting of the plurality of first blades 111 to the plurality of first long strip-shaped regions 51 is realized, the synchronous cutting of at least one first blade 111 to the plurality of second long strip-shaped regions 52 is facilitated, the cutting of the entire cutting region 3321 by the first cutter 11 is facilitated, and the structure of the cutting knife assembly 10 is simplified.

[0206] Optionally, the plurality of first cutting tooth parts 1112 can be located on the same straight line extending along the first direction, so as to make the first cutter 11 better adapt to the cutting region 3321 with a straight line as the cutting reference, at this time, the first cutting tooth part 1112 is arranged in alignment with one of the cutting references of the cutting region 3321 when the first cutter 11 cuts the cutting region 3321. Of course, in other examples, the plurality of first cutting tooth parts 1112 can also be located on the same curve.

[0207] Optionally, the position of at least one of all the first blades 111 of the first cutter 11 in the second direction is adjustable, so as to realize the adjustable relative position of the plurality of first cutting teeth 1112 in the second direction, so that the first cutter 11 better adapts to the cutting area 3321 of different shapes, and the applicability of the first cutter 11 is improved.

[0208] Please refer to Figure 16 and Figure 17 In some embodiments, the spacing x3 between the two adjacent first cutting teeth 1112 is less than or equal to 2 mm, and the spacing x3 is also the spacing between the two adjacent first blades 111; and / or, the length y1 of the first cutting tooth 1112 in the second direction is less than or equal to 2 mm.

[0209] Optionally, x3 can be 0.9 mm, 1 mm, 1.2 mm, 1.5 mm, or 2 mm, etc.; y1 can be 2 mm, 1.8 mm, 1.6 mm, 1.3 mm, 1 mm, or 0.9 mm, etc.

[0210] In the above technical solution, by setting the spacing x3 between the two adjacent first cutting teeth 1112 to be less than or equal to 2 mm, and / or the length y1 of the first cutting tooth 1112 in the second direction to be less than or equal to 2 mm, when the cutting knife assembly 10 cuts the plurality of second long strip-shaped areas 52, a suitable cutting position can be selected based on the previous cutting position of the first cutting tooth 1112, and the spacing x3 between the two adjacent first cutting teeth 1112 and the length y1 of the first cutting tooth 1112 in the second direction will both affect the size of the part of the second long strip-shaped area 52 remaining on the cutting piece, so as to effectively control the size of the part of the second long strip-shaped area 52 remaining on the cutting piece, thereby effectively controlling the length of the wire drawn after the cutting knife assembly 10 cuts the cutting area 3321, so as to control the length of the wire drawn within a reasonable range, so as to further improve the reliability and safety of the product.

[0211] It can be understood that in the embodiments of the present application, in the case that the first cutter 11 cuts the cutting area 3321, the spacing between the two adjacent first cutting teeth 1112 corresponds to the width of the root position of the second long strip-shaped area 52 in the first direction; in the case that the size of the cutting area 3321 is fixed, the width of the root position of the second long strip-shaped area 52 in the first direction and the length of the second long strip-shaped area 52 in the second direction will both affect the size of the part of the second long strip-shaped area 52 remaining on the cutting piece, i.e., affect the length of the wire drawn.

[0212] For example, when the cutting knife assembly 10 cuts the plurality of second long strip-shaped regions 52 of the cutting region 3321, the cutting position can take the cutting position of the first cutting tooth part 1112 in the last cutting process as a reference datum, for example, the cutting position can be selected at a first limit cutting position corresponding to one end of the first cutting tooth part 1112 connected with the first cutting part 1111, or the cutting position can be selected at a second limit cutting position corresponding to the other end of the first cutting tooth part 1112 away from the first cutting part 1111, or the cutting position can be selected at any position between the above-mentioned first limit cutting position and the above-mentioned second limit cutting position, and the length of the part of the second long strip-shaped region 52 remaining on the to-be-cut member is related to the cutting position; therefore, the above technical solution realizes effective control of the stretch length by reasonably setting the size and arrangement spacing of the first cutting tooth part 1112.

[0213] In addition, when the first cutting knife 11 cuts the second long strip-shaped region 52, the first cutting tooth part 1112 can correspond to the second cutting datum 5b, at this time, at least part of the first cutting tooth part 1112 can protrude out of the second cutting datum 5b to cut out the first groove 3220, and in the above technical solution of the present application, the length of the first cutting tooth part 1112 is set to be not more than 2 mm to realize control of the size of the first groove 3220, thereby realizing control of the stretch length at the second cutting datum 5b, that is, realizing the length of the stretch remaining on the to-be-cut member at the second cutting datum 5b. Similarly, the cutting and forming of the second groove are similar to the cutting and forming process of the first groove, and details are not described herein.

[0214] Please refer to Figures 16-19 In some embodiments, the first cutting tooth part 1112 is triangular, the maximum thickness t1 of the first blade 111 is ≤1 mm, for example, t1 can be 1 mm, 0.9 mm, or 0.8 mm, etc.; or, the first cutting tooth part 1112 is square, the maximum thickness t2 of the first blade 111 is ≤0.71 mm, for example, t2 can be 0.71 mm, 0.6 mm, or 0.55 mm, etc.; or, the first cutting tooth part 1112 is trapezoidal, the maximum thickness t3 of the first blade 111 is ≤1 mm, for example, t3 can be 1 mm, 0.95 mm, or 0.8 mm, etc. Then, for the above-mentioned embodiments, the maximum thickness of the first cutting tooth part 1112 is the maximum thickness of the first blade 111.

[0215] It can be understood that, in the embodiments of the present application, in the case that the first cutting knife 11 cuts the cutting region 3321, the thickness of the first blade 111 corresponds to the width of the first long strip-shaped region 51 in the first direction, or corresponds to the spacing of the adjacent two second long strip-shaped regions 52 in the first direction.

[0216] In the technical solution, the maximum thickness of the first blade 111 is set according to the different shapes of the first toothed cutting part 1112, so that the thickness of the first blade 111 is well matched with the shape of the first toothed cutting part 1112, the first blade 111 has appropriate cutting ability, and the cutting reliability and accuracy of the cutting size control of the first blade 111 are improved. Obviously, the first toothed cutting part 1112 can correspond to the concave part between the adjacent two convex parts 2a on the sawtooth structure 2b at the cutting position.

[0217] For example, the first cutting part 1111 is an equal-thickness structure, the thickness of the first toothed cutting part 1112 decreases or remains unchanged along the direction away from the first cutting part 1111, and the maximum thickness of the first toothed cutting part 1112 is equal to the thickness of the first cutting part 1111. It can be seen that when the first toothed cutting part 1112 and the first cutting part 1111 are both equal-thickness structures, the thicknesses of the two are equal, and the thickness of the first toothed cutting part 1112 and the thickness of the first cutting part 1111 can both be the maximum thickness of the first blade 111; when the first cutting part 1111 is an equal-thickness structure and the thickness of the first toothed cutting part 1112 decreases along the direction of the first cutting part 1111, the maximum thickness of the first toothed cutting part 1112 and the thickness of the first cutting part 1111 are both the maximum thickness of the first blade 111.

[0218] Please refer to 8- Figure 11 and Figure 20 In some embodiments, the cutting area 3321 includes a plurality of first long strip-shaped areas 51 and a plurality of second long strip-shaped areas 52, the plurality of first long strip-shaped areas 51 and the plurality of second long strip-shaped areas 52 are arranged alternately along the first direction, the first long strip-shaped area 51 and the second long strip-shaped area 52 extend along the second direction, and the first cutting knife 11 is used for cutting the plurality of first long strip-shaped areas 51; the cutting knife assembly 10 further includes a second cutting knife 12, the second cutting knife 12 includes at least one second blade 121 extending along the first direction, the second blade 121 can extend in a long strip shape, and the second cutting knife 12 is used for cutting the plurality of second long strip-shaped areas 52.

[0219] In the technical solution, the cutting knife assembly 10 further includes the second cutting knife 12, the first cutting knife 11 and the second cutting knife 12 cut different areas of the cutting area 3321 respectively, which can simplify the cutting control of the first cutting knife 11 and the second cutting knife 12, and facilitate the first cutting knife 11 to maintain the same posture for cutting and the second cutting knife 12 to maintain the same posture for cutting, so that the first blade 111 extends along a fixed direction, the second blade 121 extends along a fixed direction, and the extension direction of the first blade 111 intersects with the extension direction of the second blade 121. It is not necessary to frequently adjust the placement posture of the first cutting knife 11 and the second cutting knife 12 during cutting, and only the corresponding cutting knife needs to be replaced, which is convenient for simplifying the cutting process.

[0220] For example, the first cutter 11 keeps a certain posture to punch the first long strip-shaped region 51 to cut off the part corresponding to the first long strip-shaped region 51, and then the second cutter 12 keeps a certain posture to cut the remaining second long strip-shaped region 52 to cut off the second long strip-shaped region 52. It can be seen that the cutting region 3321 is cut twice in succession, and the cutting paths and positions of the two times of cutting are different, and the application adopts different cutters to realize the above-mentioned two times of cutting, so that the cutting posture of the cutting assembly 10 does not need to be adjusted frequently, and the cutting operation is simplified.

[0221] Alternatively, when the second cutter 12 cuts the second region, the cutting position of the second cutter 12 can take the cutting position of the first cutting tooth part 1112 in the last first cutter 11 cutting process as a reference datum, for example, the cutting position of the second cutter 12 can be selected at the first limit cutting position corresponding to one end of the first cutting tooth part 1112 connected with the first cutting part 1111, or the cutting position of the second cutter 12 can be selected at the second limit cutting position corresponding to the end of the first cutting tooth part 1112 away from the first cutting part 1111, or the cutting position of the second cutter 12 can be selected at any position between the above-mentioned first limit cutting position and the above-mentioned second limit cutting position. Taking the cutting position of the second cutter 12 selected at the first limit cutting position as an example, the surface of the thickness side of the second cutter 12 away from the free end of the second long strip part can be aligned with the first limit cutting position of the first cutting tooth part 1112, and cutting is performed in the direction perpendicular to the cutting region 3321.

[0222] Please refer to Figure 20 In some embodiments, the second cutter 12 includes two groups of blade sets spaced apart in the second direction, each group of blade sets including at least one second blade 121, and the two groups of blade sets are respectively used to cut the second long strip-shaped region 52 located on the two sides of the overlap region 321 in the second direction.

[0223] It can be understood that when the second cutter 12 includes a plurality of second blades 121, in one cutting process, the second cutter 12 can be used to simultaneously cut the cutting regions on the opposite sides of the overlap region 321, that is, one group of blade sets cuts off the cutting region on one side of the overlap region 321, and the other group of blade sets cuts off the cutting region on the other side of the overlap region 321.

[0224] For example, as Figures 8-11 and Figure 20As shown, the second cutter 12 includes two groups of blades, each group of blades including one second blade 121, and the two cutting areas on the opposite sides of the to-be-cut member in the second direction, after the first cutter 11 cuts the two cutting areas in turn, one second blade 121 can be aligned with the required cutting position of one cutting area, and the other second blade 121 is aligned with the required cutting position of the other cutting area, so that the second cutter 12 simultaneously cuts the two cutting areas twice. In other examples, the second cutter 12 includes two second blades 121, which are used to cut one cutting area, at which time one first blade 121 can be used to cut the cutting reference, such as the cutting reference of the left side of the second cutter 12, and the other first blade 121 can be used to cut the cutting reference of the right side of the second cutter 12. Figure 17 The second cutter 12 on the left side of the middle is used to cut the plurality of second long strip-shaped areas 52 of the leftmost cutting area, and the second cutter 12 can be moved to the left until the second blade 121 on the right side is aligned with the required cutting position of the plurality of second long strip-shaped areas 52. Of course, the second cutter 12 can also be used for cutting more than two cutting areas.

[0225] In the above technical solution, by setting the second cutter 12 to include two groups of blades, and making the two groups of blades respectively used to cut the second long strip-shaped areas 52 located on the two sides of the overlap area 321 in the second direction, the two groups of blades are respectively used to cut the cutting areas 3321 located on the two sides of the overlap area 321 in the second direction, so as to simultaneously cut the cutting areas 3321 on the two sides of the overlap area 321, and improve the processing efficiency of the electrode assembly 30.

[0226] Of course, in other examples, the second cutter 12 can also include one second blade 121.

[0227] In some embodiments, the spacing between the two groups of blades is adjustable.

[0228] In the above technical solution, by setting the spacing between the two groups of blades to be adjustable, it is convenient for the second cutter 12 to simultaneously cut the two cutting areas 3321, whether the same to-be-cut member or different to-be-cut members, the second cutter 12 can adapt to the different spacing between the two cutting areas 3321, that is, adapt to the different sizes of the tab portion 32, so as to improve the operability and applicability of the second cutter 12 in simultaneously cutting the two cutting areas 3321.

[0229] For example, the second cutter 12 includes two groups of blades, and the opposite sides of the to-be-cut member have cutting areas 3321, respectively, and for different specifications of the to-be-cut member, the spacing between the cutting areas 3321 on the opposite sides is not equal, and the spacing between the two groups of blades is adjustable to adapt to the change in the spacing between the above two cutting areas 3321, and improve the applicability of the second cutter 12.

[0230] Please refer to Figure 20 and Figure 21 In some embodiments, each second blade 121 comprises a second cutting portion 1211 and a second tooth portion 1212 arranged in sequence along the first direction, and the length y2 of the second tooth portion 1212 in the first direction is less than or equal to 2 mm.

[0231] In the above technical solution, by arranging the second blade 121 to comprise the second cutting portion 1211 and the second tooth portion 1212, and the length y2 of the second tooth portion 1212 in the first direction is less than or equal to 2 mm, when the second cutter 12 cuts the plurality of second long strip-shaped regions 52, the cutting position of the second cutter 12 in the second direction can be selected based on the previous cutting position of the first tooth portion 1112, and the cutting position of the second cutter 12 in the first direction can be selected based on the relative position between the second tooth portion 1212 and the second cutting reference 5b. If at least part of the second tooth portion 1212 protrudes from the second cutting reference 5b to cut the first groove 3220 on the second cutting reference 5b, the size of the first groove 3220 can be controlled to control the wire drawing length at the second cutting reference 5b.

[0232] It can be understood that when the second blade 121 is a plurality of second blades 121, the second tooth portions 1212 of the plurality of second blades 121 are located at the same end of the plurality of second blades 121 in the first direction, so that the plurality of second blades 121 can be connected into a whole by fixing the ends of the plurality of second cutting portions 1211 away from the second tooth portions 1212, so as to realize synchronous cutting of the plurality of second blades 121.

[0233] Optionally, when the second cutter 12 comprises a plurality of second blades 121 arranged at intervals along the second direction, the plurality of second tooth portions 1212 can be located on the same straight line extending along the second direction, so that the second cutter 12 can better adapt to the cutting region 3321 with straight cutting references. When the second cutter 12 cuts the cutting region 3321, the second tooth portion 1212 is adapted to be arranged in alignment with one of the cutting references of the cutting region 3321. Of course, in other examples, the plurality of second tooth portions 1212 can also be located on the same curve.

[0234] Optionally, at least one of the plurality of second blades 121 of the first cutter 11 is adjustable in position in the first direction, so as to adjust the relative positions of the plurality of second tooth portions 1212 in the first direction, so that the second cutter 12 can better adapt to cutting regions 3321 of different shapes, and improve the applicability of the second cutter 12.

[0235] Optionally, when the first blade 111 comprises the first cutting part 1111 and the first cutting tooth part 1112, and the second blade 121 comprises the second cutting part 1211 and the second cutting tooth part 1212, the shape of the second cutting tooth part 1212 can be the same as or different from the shape of the first cutting tooth part 1112. Exemplarily, the second cutting tooth part 1212 and the first cutting tooth part 1112 are both formed into a triangle, a square or a trapezoid; of course, in some examples, the first cutting tooth part 1112 is formed into a triangle, and the second cutting tooth part 1212 is formed into a square or a trapezoid.

[0236] Please refer to Figure 20 and Figure 21 In some embodiments, the second cutting part 1211 is an equal-thickness structure, the thickness of the second cutting part 1211 decreases or remains unchanged in the direction away from the second cutting part 1211, and the maximum thickness of the second cutting tooth part 1212 is equal to the thickness of the second cutting part 1211.

[0237] It can be seen that when the second cutting tooth part 1212 and the second cutting part 1211 are both equal-thickness structures, the thicknesses of the two are equal, and the thickness of the second cutting tooth part 1212 and the thickness of the second cutting part 1211 can both be the maximum thickness of the second blade 121; when the second cutting part 1211 is an equal-thickness structure and the thickness of the second cutting tooth part 1212 decreases in the direction of the second cutting part 1211, the maximum thickness of the second cutting tooth part 1212 and the thickness of the second cutting part 1211 are both the maximum thickness of the second blade 121.

[0238] In the above embodiments, the second cutting tooth part 1212 is a triangle, and the maximum thickness t4 of the second blade 121 is ≤1mm; or, the second cutting tooth part 1212 is a square, and the maximum thickness t5 of the second blade 121 is ≤0.71mm; or, the second cutting tooth part 1212 is a trapezoid, and the maximum thickness t6 of the second blade 121 is ≤1mm. Then, for the above embodiments, the maximum thickness of the second cutting tooth part 1212 is the maximum thickness of the second blade 121.

[0239] In the above technical solutions, by setting the maximum thickness of the second blade 121 when the second cutting tooth part 1212 is in different shape structures, the thickness of the second blade 121 and the shape of the second cutting tooth part 1212 are well matched, so that the second blade 121 has appropriate cutting ability, and the cutting reliability and accuracy of the cutting size control of the second blade 121 are improved.

[0240] For example, the tab sheet 320 is in a square structure, the tab sheet 320 has two oppositely arranged first edges and two oppositely arranged second edges, one of the first edges is electrically connected with the current collector 311, at least one of the two second edges is formed with a plurality of first protrusions, and the plurality of protrusions 32a located at the same edge are formed in a sawtooth structure 32b; for another example, the tab sheet 320 is in a trapezoidal structure, the bottom edge of the tab sheet 320 is electrically connected with the current collector 311, at least one of the two corresponding edges of the two waists of the tab sheet 320 is formed with a plurality of protrusions 32a, and the plurality of protrusions 32a located at the same edge are formed in a sawtooth structure 32b.

[0241] In the above technical solution, at least one end edge of the tab sheet 320 is formed with a plurality of protrusions 32a, and the plurality of protrusions 32a located at the same end are formed in a sawtooth structure 32b.

[0242] It can be understood that the shape of the protrusion 32a is not specifically limited in the embodiments of the present application, for example, the protrusion 32a can be formed in a square or trapezoidal shape, etc.

[0243] It can be understood that the protrusion 32a corresponds to the second sub-region 522 in the cutting method described above, so d2=d1.

[0244] Please refer again to Figure 9 , Figures 14-18 , the electrode assembly 30, the cutting knife assembly 10 and the cutting method of the specific embodiments of the present application are described.

[0245] The electrode assembly 30 includes an active material coated portion 31 and a tab portion 32, the tab portion 32 including a plurality of tab pieces 320 stacked and connected, an overlapping portion of the plurality of tab pieces 320 forming an overlapping region 321, and a misaligned portion of the plurality of tab pieces 320 forming a misaligned region 322 connected to the overlapping region 321; the misaligned region 322 is two and the two misaligned regions 322 are respectively located on both sides of the overlapping region 321 in a second direction, each misaligned region 322 including a first connecting portion 3221 and a second connecting portion 3222, the first connecting portion 3221 being connected to the active material coated portion 31 on one side in a first direction, and the second connecting portion 3222 being connected to the first connecting portion 3221 on the other side in the first direction, in the second direction, an end of the second connecting portion 3222 away from the overlapping region 321 is closer to the overlapping region 321 than an end of the first connecting portion 3221 away from the overlapping region 321, and the second direction is perpendicular to the first direction. Wherein, an edge of the end of the second connecting portion 3222 away from the overlapping region 321 is in a sawtooth structure 32b, a first groove 3220 is formed at a position of the first connecting portion 3221 connected to the edge of the end of the second connecting portion 3222 away from the overlapping region 321, and the sawtooth structure 32b of the end of the first connecting portion 3221 away from the active material coated portion 31 and the edge of the end of the second connecting portion 3222 away from the overlapping region 321 are both obtained by cutting.

[0246] In the embodiment of the present application, the cutting knife assembly 10 includes a first cutting knife 11 and a second cutting knife 12, the first cutting knife 11 including a plurality of first blades 111 spaced apart along a first direction, each first blade 111 extending along a second direction, the first direction and the second direction intersecting, and the second cutting knife 12 including two second blades 121 spaced apart along the second direction. Each first blade 111 includes a first cutting portion 1111 and a first cutting tooth portion 1112 arranged in sequence along the second direction, the first cutting tooth portions 1112 of the plurality of first blades 111 being located at the same end of the plurality of first blades 111 in the second direction, and the ends of the plurality of first cutting portions 1111 away from the first cutting tooth portions 1112 being fixedly connected; each second blade 121 includes a second cutting portion 1211 and a second cutting tooth portion 1212 arranged in sequence along the first direction, the second cutting tooth portions 1212 of the plurality of second blades 121 being located at the same end of the plurality of second blades 121 in the second direction, and the ends of the plurality of second cutting portions 1211 away from the second cutting tooth portions 1212 being fixedly connected.

[0247] The cutting region 3321 has the first cutting reference 5a and the second cutting reference 5b abutting, the first cutting reference 5a extends along the first direction, the cutting region 3321 includes a plurality of first long strip regions 51 and a plurality of second long strip regions 52, the plurality of first long strip regions 51 and the plurality of second long strip regions 52 are arranged alternately along the first direction one by one, the first long strip region 51 and the second long strip region 52 extend along the second direction. The cutting method includes:

[0248] S1, a plurality of connection pieces 33 connected with the active substance coating part 31 are arranged in layers and partially misaligned, the plurality of connection pieces 33 have overlapping parts 331 and misaligned parts 332;

[0249] S2, the misaligned part 332 is divided into a cutting region 3321 and a non-cutting region 3322, the non-cutting region 3322 includes a first connection part 3221 and a second connection part 3222 connected with each other and respectively connected with the overlapping part, the first connection part 3221 is connected with the active substance coating part 31 and the cutting region 3321 respectively on both sides in the first direction, the second connection part 3222 is connected with the overlapping part 331 and the cutting region 3321 respectively on both sides in the second direction; the misaligned part 332 has the first cutting reference 5a extending along the first direction and the second cutting reference 5b extending along the second direction, the cutting region 3321 includes a plurality of first long strip regions 51 and a plurality of second long strip regions 52, the plurality of first long strip regions 51 and the plurality of second long strip regions 52 are arranged alternately along the first direction one by one, the first long strip region 51 and the second long strip region 52 extend along the second direction;

[0250] S3, cutting off the cutting area 3321 to form the remaining part of the plurality of connecting pieces 33 as the tab part 32 of the electrode assembly 30, comprising: S31, cutting off the plurality of first long strip-shaped areas 51 based on the first cutting reference 5a and the second cutting reference 5b, comprising: the adjacent two sides of the cutting knife assembly 10 are respectively aligned with the first cutting reference 5a and the second cutting reference 5b, then the width side of the most side first blade 111 of the first cutting knife 11 away from other first blades 111 is aligned with the second cutting reference 5b, and the end of the plurality of first cutting tooth parts 1112 is aligned with the first cutting reference 5a; S32, cutting off the plurality of second long strip-shaped areas 52 based on the first cutting reference 5a and the second cutting reference 5b, comprising: the adjacent two side edges of the cutting knife assembly 10 are respectively aligned with the first reference line L1 and the second reference line L2, the first reference line L1 corresponds to the inside of the cutting area and is away from the first cutting reference 5a by a first predetermined value a, and the second reference line L2 corresponds to the outside of the cutting area and is away from the second cutting reference 5b by a second predetermined value b, then the side of each second blade 112 opposite to each other is aligned with the corresponding first cutting reference 5a, and the end of the second cutting tooth part 1212 is aligned with the second cutting reference 5b, so that the second cutting tooth part 1212 cuts out the first groove 3220.

[0251] In the above technical solution, the size of the part, i.e., the convex part 32a, remaining on the tab part 32 at the first cutting reference 5a and the second cutting reference 5b can be effectively shortened, thereby shortening the wire drawing length when cutting the tab part 32, effectively reducing the risk of short circuit of the pole piece caused by the long wire drawing length extending into the electrode assembly, improving the reliability and safety of the electrode assembly, and improving the first time yield (FTY) of the product. Moreover, since the edge of the tab part 32 has the convex part 32a, it is convenient to have a certain tolerance for the cutting gap in the cutting process, which is conducive to reducing the requirements for the cutting knife assembly 10 and improving the service life of the cutting knife assembly 10.

[0252] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The above is only the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electrode assembly, characterized in that: include: active material coating portion; a tab portion connected to the active material coating portion; the tab portion includes a plurality of tab sheets stacked and connected, overlapping portions of the plurality of tab sheets forming an overlapping region, and staggered portions of the plurality of tab sheets forming a staggered region connected to the overlapping region; In which, the dislocation area includes a first connecting part and a second connecting part, the first connecting part is connected to the active material coating part on one side along the first direction, and the second connecting part is connected to the first connecting part on the other side along the first direction; in the second direction, the end of the second connecting part away from the overlapping area is closer to the overlapping area than the end of the first connecting part away from the overlapping area, and the second direction intersects with the first direction.

2. The electrode assembly according to claim 1, wherein The edge of one end of the second connecting portion away from the overlapping area has a serrated structure; and / or, An edge of one end of the first connecting portion away from the active material coating portion has a serrated structure.

3. The electrode assembly according to claim 2, characterized in that The serrated structure of the edge of the second connecting portion includes a plurality of convex portions sequentially arranged along the first direction, and / or the serrated structure of the edge of the first connecting portion includes a plurality of convex portions sequentially arranged along the second direction, Wherein, the height h1 of the convex portion is ≤2 mm; and / or, A diameter d1 of a circumscribed circle of a projection of the protrusion along the thickness direction of the tab portion is ≤2 mm.

4. The electrode assembly according to claim 2, wherein: The serrated structure of the edge of the second connecting portion includes a plurality of convex portions sequentially arranged along the first direction, and the convex portions are square or trapezoidal; and / or, The serrated structure of the edge of the first connecting portion includes a plurality of convex portions sequentially arranged along the second direction, and the convex portions are square or trapezoidal.

5. The electrode assembly according to claim 2, wherein: When the edge of the second connecting portion is formed with the serrated structure, a first groove is formed at a position where the edge of the first connecting portion that is connected to the end of the second connecting portion away from the overlapping area is connected; or When the edge of the first connection portion is formed with the serrated structure, a second groove is formed at a position of the second connection portion connected to an edge of the first connection portion away from the active material coating portion.

6. The electrode assembly according to claim 2, wherein: At least one of an edge of the first connecting portion away from the active material coating portion and an edge of the second connecting portion away from the overlapping region is obtained by cutting.

7. The electrode assembly according to claim 1, wherein: One of the offset regions is provided on opposite sides of the overlapping region in the second direction.

8. The electrode assembly according to any one of claims 1 to 7, characterized in that: The active material coating portion includes a positive electrode sheet body, a negative electrode sheet body, and a separator. The plurality of tabs are respectively connected to the positive electrode sheet body and the negative electrode sheet body. The separator is provided between the positive electrode sheet body and the negative electrode sheet body and extends beyond the positive electrode sheet body and the negative electrode sheet body. Wherein, at least a portion of the first connecting portion is blocked by the isolation film.

9. A battery cell, characterized in that: The invention comprises a shell, a pole and an electrode assembly according to any one of claims 1 to 8, wherein the pole is provided in the shell, the active material coating portion is accommodated in the shell, and the pole ear portion is electrically connected to the pole.

10. The battery cell according to claim 9, characterized in that A receiving groove is formed on the pole, and a part of the pole ear portion is accommodated in the receiving groove. The side of the receiving groove facing away from the active material coating portion is open, and the groove wall on the side of the receiving groove facing the active material coating portion is formed with a through hole connected to the interior of the shell, and the pole ear portion is inserted into the through hole.

11. The battery cell according to claim 10, characterized in that The battery cell further includes a pole cover plate, which is disposed on the pole and closes a notch of the accommodation slot.

12. A battery, characterized in that: The invention comprises a battery cell according to any one of claims 9 to 11.

13. An electrical device, characterized in that: The battery according to claim 12 is included for providing electrical energy.

14. A method for processing an electrode assembly, characterized in that: include: stacking a plurality of connection sheets connected to the active material coating portion and partially staggering the connection sheets, wherein the plurality of connection sheets have overlapping portions and staggered portions; Dividing the offset portion into a cutting area and a non-cutting area, wherein the non-cutting area includes a first connecting portion and a second connecting portion connected to each other and respectively connected to the overlapping portion, wherein the first connecting portion connects the active material coating portion and the cutting area on both sides in a first direction, and the second connecting portion connects the overlapping portion and the cutting area on both sides in a second direction, wherein the second direction intersects the first direction; The cutting area is cut off so that the remaining parts of the plurality of connecting sheets form the electrode lugs of the electrode assembly.

15. The method for processing an electrode assembly according to claim 14, wherein: The offset portion has a first cutting reference extending along the first direction and a second cutting reference extending along the second direction, the cutting area includes a plurality of first long strip areas and a plurality of second long strip areas, the plurality of first long strip areas and the plurality of second long strip areas are alternately arranged one by one along the first direction or the second direction, and the first long strip areas and the second long strip areas extend along the second direction or the first direction. Cutting off the cropping area includes: Cutting off the plurality of first long strip areas based on the first cutting reference and the second cutting reference; The plurality of second elongated strip areas are cut off based on the first cutting reference and the second cutting reference.

16. The method for processing an electrode assembly according to claim 15, wherein: Cutting the plurality of first long strip areas based on the first cutting reference and the second cutting reference includes: aligning adjacent two sides of the cutting blade assembly with the first cutting reference and the second cutting reference respectively; The plurality of second long strip areas are cut out based on the first cutting reference and the second cutting reference, including: adjacent side edges of the cutting knife assembly are aligned with a first reference line and a second reference line, respectively, the first reference line corresponds to the inside of the cutting area and is at a first predetermined value a away from the first cutting reference, and the second reference line corresponds to the outside of the cutting area and is at a second predetermined value b away from the second cutting reference.

17. The method for processing an electrode assembly according to claim 16, wherein: Each of the second long strip regions includes a first sub-region and a second sub-region sequentially arranged along its length direction, wherein the second sub-region is located between the first cutting reference and the first reference line. The diameter d2 of the circumscribed circle of the projection of the second sub-region along the stacking direction is ≤ 2 mm, and the stacking direction is perpendicular to the first direction and the second direction respectively; and / or, a≤2mm; and / or, b≤2mm.

18. A cutting knife assembly, characterized in that: Used to cut a workpiece to be cut to obtain an electrode assembly, the workpiece to be cut includes an active material coating portion and a to-be-cut portion, the to-be-cut portion being connected to the active material coating portion; the to-be-cut portion includes a plurality of connecting sheets stacked and connected, the overlapping portions of the plurality of connecting sheets forming an overlapping area, the staggered portions of the plurality of connecting sheets including a cutting area and a non-cutting area, the non-cutting area including a first connecting portion and a second connecting portion connected to each other and respectively connected to the overlapping portion, the first connecting portion connecting the active material coating portion and the cutting area on both sides in a first direction, the second connecting portion connecting the overlapping portion and the cutting area on both sides in a second direction, the second direction intersecting the first direction; The cutting knife assembly includes: a first cutter, the first cutter comprising a plurality of first blades spaced apart along a first direction, each of the first blades extending along a second direction; The first cutter is used to cut off at least a portion of the cutting area so that the remaining portions of the plurality of connecting sheets form the electrode lug portion, and the electrode lug portion and the active material coating portion form the electrode assembly.

19. The cutting knife assembly according to claim 18, wherein: The cutting area includes a plurality of first long strip areas and a plurality of second long strip areas, the plurality of first long strip areas and the plurality of second long strip areas are alternately arranged one by one along the first direction, and the first long strip areas and the second long strip areas extend along the second direction; The first blade is used to sequentially cut off the first long strip area and the second long strip area to form the pole ear portion; Wherein, the first blade includes a first cutting portion and a first cutting tooth portion arranged in sequence along the second direction, the first cutting tooth portions of multiple first blades are located at the same end of multiple first blades in the second direction, and the ends of multiple first cutting portions away from the first cutting tooth portion are fixedly connected.

20. The cutting knife assembly according to claim 19, wherein: The length y1 of the first cutting tooth portion in the second direction is ≤2 mm; and / or, The distance x3 between two adjacent first cutting tooth parts is ≤2 mm.

21. The cutting knife assembly according to claim 19, wherein: The first cutting tooth portion is triangular, and the maximum thickness t1 of the first blade is ≤ 1 mm; or The first cutting tooth portion is square, and the maximum thickness t2 of the first blade is ≤ 0.71 mm; or The first cutting tooth portion is trapezoidal, and the maximum thickness t3 of the first blade is ≤1 mm.

22. The cutting knife assembly according to claim 18, wherein: The cutting area includes a plurality of first long strip areas and a plurality of second long strip areas, the plurality of first long strip areas and the plurality of second long strip areas are alternately arranged along the first direction, the first long strip areas and the second long strip areas extend along the second direction, the first cutter is used to cut the plurality of first long strip areas, and the cutter assembly further includes: The second cutter includes at least one second blade extending along the first direction, and the second cutter is used to cut the plurality of second long strip areas.

23. The cutting knife assembly according to claim 22, wherein: The second cutter includes two groups of blade sets spaced apart in the second direction, each group of blade sets includes at least one second blade, and the two groups of blade sets are respectively used to cut the second long strip areas located on both sides of the overlapping area in the second direction.

24. The cutting knife assembly according to claim 23, wherein: The distance between the two blade groups is adjustable.

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