Battery with current collector, battery pack and vehicle with such a battery
Patent Information
- Application Number
- DE202022003221
- Authority / Receiving Office
- DE · DE
- Patent Type
- Utility models
- Current Assignee / Owner
- Priority Date
- 2022-01-05
- Filing Date
- 2022-01-19
- Publication Date
- 2025-10-30
- Estimated Expiration
- 2032-01-31
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
TECHNICAL AREA
[0001] The present disclosure relates to a battery with a current collector, a battery pack, and a vehicle with such a battery. In particular, the present disclosure relates to a current collector with a structure for preventing damage in a welded section with an electrode arrangement when external shock loads are applied, a battery with the same, a battery pack, and a vehicle with such a battery. STATE OF THE ART
[0002] In general, conventional cylindrical batteries have a structure in which a tab connecting a jelly roll structure to an external terminal is welded to a film of the jelly roll structure. Cylindrical batteries of this design exhibit a limited current path and very high resistance due to the jelly roll structure itself.
[0003] Accordingly, attempts were made to reduce the resistance by increasing the number of tabs connecting the jelly roll structure to the external terminal, but increasing the number of tabs is not sufficient to reduce the resistance to a desired level and ensure an adequate current path.
[0004] Accordingly, to reduce the resistance of the jelly roll structure itself, it is necessary to develop a new jelly roll structure and a current collector structure suitable for the jelly roll structure. In particular, devices requiring high-power / high-capacity battery packs, such as electric vehicles, are more reliant on the use of new jelly roll structures and current collectors.
[0005] Furthermore, it is necessary to develop cylindrical batteries that have a structure with improved coupling strength between a current collector and a battery housing, and a current collector structure that is used for the cylindrical batteries.
[0006] Furthermore, it is necessary to develop cylindrical batteries with improved energy density by minimizing the dead space in the battery housing when the current collector and the battery housing are coupled.
[0007] Recently, the form factor of cylindrical batteries used in electric vehicles has been increasing. This means that the diameter and height of cylindrical batteries are increasing compared to conventional cylindrical batteries with form factors of 1865 and 2170. This increase in form factor results in higher energy density, improved thermal runaway resistance, and better cooling efficiency.
[0008] The energy density of the cylindrical battery can be further increased if the unnecessary space in the battery casing is minimized along with the increasing form factor. Accordingly, it is necessary to design the current collector with a low-resistance structure across the entire battery structure to increase the battery's capacity and minimize the amount of heat generated during fast charging.
[0009] Furthermore, battery packs used in electric vehicles are frequently exposed to vibrations and shocks due to the environment in which they are used. Accordingly, there is a need to develop cylindrical batteries with a structure that reduces the likelihood of damage occurring in a welded section when subjected to vibrations and external shock loads, and a current collector structure for use with these cylindrical batteries. TECHNICAL TASK
[0010] The present invention is intended to solve the problem described above, and therefore the present invention is directed to providing a current collector with a suitable structure for an electrode arrangement with a low-resistance structure, and a battery containing the same.
[0011] According to another aspect, the present invention is directed to providing a current collector with a structure for improving the coupling strength of a section coupled between the current collector and the battery housing and a battery, as well as to the latter.
[0012] According to another aspect, the present invention is directed to providing a current collector with a structure for improving the energy density of a battery and a battery containing the same.
[0013] According to another aspect, the present invention is directed to providing a current collector with a structure for increasing the practicality of the welding process for the electrical connection between the battery housing and the current collector during the manufacture of the battery in order to improve productivity, and to a battery containing the same.
[0014] According to a further aspect, the present invention is directed to providing a current collector with a structure for significantly reducing the probability that damage may occur to the section welded to the electrode assembly and / or the section welded to the battery housing when vibrations and shock loads are applied, and to a battery containing the same.
[0015] According to another aspect, the present invention is directed to providing a current collector with a structure for increasing the practicality of the welding process for the electrical connection between the battery housing and the current collector during battery manufacturing in order to improve productivity, as well as to a battery containing the same.
[0016] However, the technical problem of the present invention is not limited to the problems described above, and other problems not mentioned here will become clear to the person skilled in the art in view of the following description. SUMMARY OF THE INVENTION
[0017] A first aspect of the invention relates to a battery according to claim 1, comprising an electrode assembly with a first electrode, a second electrode, and a separator arranged between the first electrode and the second electrode, wherein the first electrode, the second electrode, and the separator are wound in one winding direction. The first electrode, the second electrode, and the separator can be wound around a winding axis that defines a core and an outer circumferential surface.
[0018] The first electrode has a first uncoated area that is free of any active material coating, and may even be free of any active material and / or layer. Thus, the first uncoated section can be a portion of the first electrode that is not coated with any active material layer and / or does not have one. While the remainder of the first electrode may be at least partially coated with an active material layer, the first uncoated section is free of such an active material layer.
[0019] The first electrode, in particular the first uncoated section, extends beyond an edge of the separator, the end of the separator extending in the winding direction. The first electrode, in particular the first uncoated section, can thus extend beyond the edge of the separator in a direction parallel to a height of the battery (axial direction) and / or perpendicular to the direction in which the first electrode, the second electrode, and the separator are wound. The first uncoated section projects from the edge of the separator, in particular in a direction parallel to the height of the battery and / or perpendicular to the direction in which the first electrode, the second electrode, and the separator are wound. The edge of the separator can correspond to a long side end thereof.In other words, the first electrode section of the separator may be exposed at its edge, particularly at one of its long sides. For example, the first uncoated section relative to an outer surface of the separator may be exposed at the separator's edge.
[0020] The aforementioned edge of the separator can correspond to an edge of the plate-shaped separator. For example, an edge of the separator can correspond to a long side end of the separator, i.e., a longer or longest side end of the plate-shaped separator. For instance, for a separator that has a substantially rectangular shape before being rolled to form the battery's electrode array, an edge of the rectangle formed by the unrolled separator, corresponding to the longer side of the rectangle, can correspond to an edge, particularly a "long side end," of the separator. The edge or long side end of the separator can thus be perpendicular to a vertical direction of the battery. In the direction perpendicular to the battery's height, the first uncoated section of the first electrode can project from and / or extend beyond the separator.In particular, the separator and each of the first and second electrodes need not necessarily have a rectangular shape, but can also have other shapes. A direction along a circumference and / or perimeter of the battery can be referred to here as the "circumferential direction". The circumferential direction can be perpendicular to a height of the battery and to a radial direction of the battery. For example, for a battery with a substantially cylindrical shape, the circumferential direction can correspond to a direction along the circumference of the circular cross-section of the battery, a radial direction can correspond to a direction parallel to a radius of the circular cross-section of the battery, and the axial height direction can correspond to a vertical direction parallel to a rotational symmetry axis of the battery.
[0021] The battery further comprises a battery housing which has an opening on one side, preferably on its underside, that can correspond to a bottom of the battery. The opening can be configured, in particular, such that the electrode assembly can be inserted into the battery housing through the opening, for example, during battery manufacturing. Thus, the electrode assembly can be enclosed and / or surrounded by the battery housing, in particular partially enclosed and / or surrounded by the battery housing. When the electrode assembly is arranged inside the battery housing, the battery housing can enclose and / or surround the electrode assembly except for the opening through which the electrode assembly may be exposed (before a housing cover, to be described below, is placed).
[0022] The battery further comprises a first current collector comprising a support section arranged on the electrode assembly, a first tab coupling section extending from the support section and coupled to the first uncoated area, and a first housing coupling section extending from the support section and coupled to an inner surface of the battery housing. Thus, at least part of the first uncoated section acts as an electrode tab, i.e., it is used to electrically connect the first electrode to the first current collector, in particular to its tab coupling section.The first electrode can be electrically connected to the battery housing via the first current collector, via the first tab coupling section, which can be electrically connected to at least part of the first uncoated section of the first electrode, and via the first housing coupling section, which can be electrically connected to the inner surface of the battery housing.
[0023] The battery also has a housing cover that covers the opening section. The housing cover can completely cover the opening section of the battery housing. Thus, if the electrode assembly is located inside the battery housing and the housing cover is arranged to cover the opening section of the battery housing, the battery housing and the housing cover can completely enclose and / or surround the electrode assembly.
[0024] The first lug coupling section and the first housing coupling section can be indirectly connected via the support section. Therefore, the first lug coupling section and the first housing coupling section do not need to be directly connected.
[0025] The battery housing may have a corrugated section formed at an end adjacent to the opening section and driven inwards. The corrugated section may be located next to and / or near a section of the battery housing that forms an end of the battery housing, in particular a lower end, where the opening section may be formed. One or more side walls of the battery housing may be radially recessed inwards at the corrugated section.
[0026] The first tab coupling section can have at least one insertion opening.
[0027] The first housing coupling section can have a first contact section that is coupled to the corrugated section of the battery housing, in particular electrically connected to it; and a first connecting section that connects the support section to the first contact section.
[0028] At least part of the first connecting section can be convex upwards with respect to an imaginary straight line connecting two ends of the first connecting section in a longitudinal direction. Additionally or alternatively, the first connecting section can have a raised section that is positioned higher than the corrugated section. In particular, the raised section of the first connecting section can be separated from a base or bottom surface of the battery by a smaller distance in a direction parallel to a height of the battery than the corrugated section.
[0029] The beading section can have an upper beading section and a lower beading section. The upper beading section can be positioned above and / or higher than the innermost radial point of the driven beading section, the innermost radial point being the radial point of the beading section closest to the radial center of the battery. The lower beading section can be positioned below and / or lower than the innermost radial point of the beading section, particularly after pressure fixing or driving.
[0030] The upper bead section and the lower bead section can be asymmetrical with respect to an imaginary reference plane passing through the innermost radial point of the bead section, the imaginary reference plane being parallel to a bottom surface of the battery casing.
[0031] At least one first lug coupling section of the first pantograph can be located at a lower point than the lower corrugated section.
[0032] The upper corrugation section and / or the lower corrugation section may be inclined with respect to a bottom surface of the battery housing, in particular at a predetermined angle, for example an angle of less than 90° or less, 75° or less, 60° or less, 45° or less, 30° or less or 15° or less.
[0033] The first contact section can be located on an inclined upper surface of the bead section.
[0034] The upper and / or lower bead section can be at least partially parallel to a base surface of the battery housing. The first contact section can preferably be arranged on a flat upper surface of the bead section.
[0035] The first contact section can be welded to an upper surface of the bead section, preferably to a flat area formed on the upper bead section.
[0036] A weld area between the first contact section and the bead section can be narrower than a flat upper surface of the bead section.
[0037] At least part of the first contact section may have the form of an arc extending in a circumferential direction along the corrugated section of the battery casing.
[0038] The first contact section can have the form of an arc extending along a circumferential direction from an intersection point between the first connecting section and the first contact section in opposite directions along the beaded section. The "intersection point between the first connecting section and the first contact section" can refer here to a section of the first housing coupling section where the first connecting section and the first contact section are adjacent to each other, particularly in the radial direction.
[0039] If the insertion depth of the corrugation section PD is a minimum value of the radius of curvature of the corrugation section R1, min is a minimum value of a weld bead width W bead,min is and a minimum value of a radius of curvature at a boundary area between the corrugated section and the inner surface of the battery housing R2, minThe battery can be configured such that PD ≥ R1, min + R2, min + W bead,min is fulfilled.
[0040] The insertion depth of the bead section can be 0.2 to 10 mm, preferably 0.2 mm to 8 mm, more preferably 0.2 mm to 5 mm.
[0041] If the insertion depth of the corrugated section is PD, a maximum value of the insertion depth PD max is an overlap length OV, where the overlap length is a shortest distance from an end of the first contact section to a vertical line passing through an innermost radial point of the bead section, a minimum value of a radius of curvature of the bead section R1, min is a minimum value of a weld bead width W bead,min is and a minimum value of a radius of curvature at a boundary area between the corrugated section and the inner surface of the battery housing R2, min is, the battery can satisfy the equation (R1, min + Wbead,min ) / PD max ≤ OV / PD ≤ (PD max - R1, min ) / PD max fulfill.
[0042] If the insertion depth of the corrugated section is PD, a maximum value of the insertion depth PD max is a distance from a radially innermost point of the bead section to the center of the weld bead, which is arranged in a radial direction at a radially outermost point, W is an overlap length OV, where the overlap length is a shortest distance from an end of the first contact section to a vertical line passing through the innermost radial point of the bead section, a minimum value of OV OV min is a maximum value of the OV OV max is and a minimum value of a weld bead width W bead,min is, the battery can satisfy the equation (OV min -0.5* W bead,min ) / PD max ≤ W / PD ≤ (OV max -0.5* W bead,min ) / PD max fulfill.
[0043] If a minimum value of the distance W is equal to W1, the battery can satisfy the equation W1 = R1 + 0.5* W bead,min and W = OV - 0.5* W bead,min fulfill.
[0044] The corrugated section may have a flat area that is at least partially parallel to a lower surface of the battery housing, and if the overlap length is OV and the radius of curvature of the corrugated section is R1, then the length of the flat area of the corrugated section in contact with the first current collector may be OV - R1.
[0045] A radial length in the width direction of a weld pattern formed between the bead section and the first contact section can be W bead,min or more and OV - R1 or less. "Radial length in width direction" here can refer to a radial extent of the weld pattern, which can correspond to a width of the weld pattern in the radial direction.
[0046] The ratio of the radial extent of the weld pattern to the length of the flat area can be in a range of 10% to 40%, 10% to 30%, 20% to 40%, or 20% to 30%.
[0047] The first connecting section can have at least one first bending section that changes direction at least once. This first bending section, therefore, does not necessarily extend in a single direction along its length, but rather changes direction once or several times, particularly along its radial length. Thus, when considered along its length, especially in the radial direction, the first bending section can extend first in a first direction, then in a second direction different from the first, and then possibly in a third and possibly in various other directions.
[0048] The first bending section may pass through the midpoint of an imaginary straight line connecting one end of the first contact section to one end of the first tab coupling section, and may be located at a higher point than an imaginary plane parallel to a bottom surface of the battery housing.
[0049] At least one of the first bending sections can be bent at an obtuse angle to avoid overlapping with itself or with each other, especially when viewed along a longitudinal axis of the battery housing.
[0050] A transition between the first contact section and the first connecting section may be bent at an obtuse angle.
[0051] The first connecting section may have an inclination that decreases stepwise or gradually, particularly along the radial direction, towards the corrugated section. Thus, the inclination of the first connecting section may decrease with increasing distance from a radial center of the battery.
[0052] The angle between the first tab coupling section and the first connecting section can be between 0 and 90°, or between 10° and 80°, or between 20° and 80°, or between 30° and 60°.
[0053] The first connecting section can support the housing cover.
[0054] The first tab coupling section and the first contact section can be arranged at substantially the same height, i.e., they can be coplanar with respect to a base of the battery. Alternatively, the first tab coupling section and the first contact section can be arranged at an equal distance from a base of the battery in a direction parallel to the height of the battery.
[0055] The first contact section may have a flat surface that is coupled to or connected with an upper surface of the bead section.
[0056] The first current collector may have a current collector opening formed at a center thereof, the center being that of a center of the battery and / or electrode assembly and / or being concentric to it.
[0057] The current collector opening can be located at a position corresponding to a winding opening formed in the center of the electrode assembly. The current collector opening can completely or partially overlap the winding opening. In particular, the current collector opening can be concentric with the winding opening. The diameter of the current collector opening can be greater than or equal to the diameter of the winding opening provided in the core of the electrode assembly.
[0058] The first current collector can further comprise a second housing coupling section extending from one end of one of the plurality of first tab coupling sections and connected to the inner surface of the battery housing. The second housing coupling section can comprise a second contact section connected to the inner surface of the battery housing; and a second connecting section connecting the end of one of the plurality of first tab coupling sections to the second contact section. At least a portion of the second contact section can extend along an inner circumferential surface of the battery housing. The second connecting section can comprise at least one second bending section that changes its direction of extension at least once, in particular as previously explained with respect to the first bending section.
[0059] A distance from the center of the first current collector to an end of the first lug coupling section, particularly in the radial direction, may be less than or substantially equal to a distance from the center of a winding opening of the electrode assembly to an innermost side of the bead section.
[0060] An upper surface of the corrugated section may have a flat area.
[0061] At least one weld bead can be formed between the bead section and the first contact section, and the at least one weld bead can form a straight weld pattern extending along a circumferential direction.
[0062] At least one weld bead can be formed between the bead section and the first contact section, and the at least one weld bead can form an arc-shaped weld pattern extending along a circumferential direction.
[0063] A weld bead formed between the bead section and the first contact section can form a weld pattern, and the weld pattern can have a linear shape formed by spot welding, for example by one or more spot weld points arranged in a line.
[0064] Several weld beads are formed between the bead section and the same first contact section.
[0065] The second electrode may further comprise a second uncoated area that is free from any active material coating, optionally free from any active material and / or active material layer. Thus, the second uncoated section may be a portion of the second electrode that is not coated with and / or does not possess any active material layer. While the remainder of the second electrode may be at least partially coated with an active material layer, the second uncoated section may be free from such an active material layer. Therefore, the second uncoated section is not coated with any active material and / or active material layer.
[0066] The second uncoated section extends beyond an edge of the separator, in particular beyond a further edge of the separator opposite an edge of the separator beyond which the first uncoated section extends, particularly in a direction parallel to a height of the battery and / or perpendicular to the direction in which the first electrode, the second electrode, and the separator are wound. The second uncoated section may project from the further edge of the separator, in particular in a direction parallel to the height of the battery and / or perpendicular to the direction in which the first electrode, the second electrode, and the separator are wound (winding direction). The further edge of the separator may correspond to a long side end thereof, in particular a long side end of the separator opposite a long side end of the separator from which the first uncoated section projects.In other words, the second section of the separator may be exposed at its edge, particularly at one of its long sides. For example, the second uncoated section may be exposed relative to the outside of the separator at its edge.
[0067] The aforementioned edges of the separator can correspond to edges of the plate-shaped separator. For example, a first edge of the separator can correspond to a first long side end of the separator, i.e., a first longer or longest side end of the plate-shaped separator, and a second edge of the separator can correspond to a second long side end of the separator, i.e., a second longer or longest side end of the plate-shaped separator. For example, for a separator that has a substantially rectangular shape before being wound up to form the battery electrode assembly, a first edge of the rectangle formed by the unwound separator, corresponding to a first longer side of the rectangle, can correspond to a first edge, in particular a first "long side end," of the separator.This first edge or the first long side end of the separator can be perpendicular to a vertical direction of the battery and / or parallel to the winding direction. A second edge of the rectangle formed by the uncoiled separator, corresponding to a second longer side of the rectangle that is parallel and opposite to the first longer side or the first edge, can correspond to a second edge, in particular a second "long side end," of the separator. This second edge or the second long side end of the separator can be perpendicular to the vertical direction of the battery and / or parallel to the winding direction.In the direction perpendicular to the height of the battery, the first uncoated section of the first electrode may project from and / or extend beyond the separator at its first edge, and the second uncoated section of the second electrode may project from and / or extend beyond the separator at its second edge. In particular, the separator and each of the first and second electrodes need not necessarily be rectangular, but may also have other shapes.
[0068] In this case, the battery may also have a terminal extending along one side of the battery casing opposite the opening through the casing. This terminal is electrically connected to the second uncoated area. The terminal may be positioned opposite the opening in the direction of the battery's height. For example, the opening may be located on the bottom of the battery, and the terminal may be located on the top. If the battery is cylindrical, for instance, the opening may be located on the bottom of the battery, and the terminal may be located on the top of the battery.
[0069] The battery may further comprise a second current collector arranged between the electrode assembly and the terminal. The second current collector may have a second tab coupling section electrically coupled to the second uncoated area, and a terminal coupling section electrically coupled to the terminal. Thus, the second uncoated section, like the first uncoated section, can act as an electrode tab, particularly for electrically connecting the terminal to the second electrode.
[0070] The connection coupling section can cover a winding opening of the electrode assembly.
[0071] The maximum diameter (outermost diameter) of the second pantograph can be larger than the outer diameter of the first pantograph. The "maximum diameter" or "outermost diameter" here can refer to the radial distance between the center of the second pantograph and its outermost radial point.
[0072] The second tab coupling section can be connected to a coupling surface formed by the bending of the second uncoated area.
[0073] The battery housing may have a crimp section formed above the bead section, the crimp section extending around a circumferential edge of the housing cover and being bent.
[0074] The first housing coupling section can be pressure-fixed (e.g., pressed together and fixed) by the crimp section.
[0075] The battery may further include a sealing element located in the crimp section and positioned between the battery housing and the housing cover. The first contact section may be located between the crimp section and the sealing element. The first contact section may be held in place by the bend of the crimp section.
[0076] At least one section of the sealing element can have a first thickness in a non-contact area where the sealing element (G1) does not touch the first contact section and a second thickness in a contact area where the sealing element touches the first contact section, the first thickness being greater than the second thickness.
[0077] At least one section of the sealing element can have a first compression ratio in a contact area where the sealing element (G1) touches the first contact section and a second compression ratio in a non-contact area where the sealing element (G1) does not touch the first contact section, wherein the first compression ratio can be greater than or substantially equal to the second compression ratio.
[0078] The thickness of at least one section of the sealing element can vary along the circumference, particularly at the corrugated section. The thickness of the sealing element can alternately increase and decrease several times along the circumference, especially at the corrugated section.
[0079] The compression ratio of the sealing element can vary along the circumferential direction, especially at the corrugated section.
[0080] The first housing coupling section can be elastically prestressed, in particular at the bead section and / or against the bead section and / or through the bead section.
[0081] A connecting section arranged between the first contact section and the first connecting section can be shaped to fit an inner surface of the beaded section. The connecting section can be a section of the first housing coupling section where the first contact section and the first connecting section are connected and / or adjacent to each other. The connecting section can have a geometry and / or profile that corresponds to (fits) a geometry and / or profile of the inner surface of the beaded section, in particular such that the connecting section can be at least partially, and optionally positively, received into the beaded section.
[0082] At least part of the first uncoated area may have multiple segments separated from each other along the winding direction of the electrode assembly. These multiple segments may be bent along a radial direction of the (wound) electrode assembly to form a tab surface. Each of the segments within the multiple segments may therefore be separated from each of the adjacent segments in the winding direction, while being materially bonded to the rest of the first electrode without material separation in a direction perpendicular to the winding direction, e.g., in a direction parallel to a height of the battery. Thus, the extent of the first electrode in the direction perpendicular to the winding direction may vary at different points along the longitudinal direction of the first electrode sheet.In particular, the first electrode can have an extent in the direction perpendicular to the winding direction in sections of the first electrode along its longitudinal direction, corresponding to one of the several segments, which is greater than an extent of the first electrode in segments along its longitudinal direction, corresponding to the spaces between the segments.
[0083] The multiple curved segments can overlap in several layers to form the tab surface. By being curved in the radial direction of the wound electrode assembly, the multiple segments overlap each other radially and form the tab surface.
[0084] The tab surface can have a first radial section and a second radial section, the first radial section being able to at least partially surround the second radial section. In the first radial section, the number of overlapping layers of the segments can successively increase from a first radial location (i.e., a first location in the radial direction of the wound electrode assembly), corresponding to an outer circumference of the wound electrode assembly (e.g., an outermost radial location of the first electrode), to a second radial location, where the number of overlapping layers of the multiple segments reaches a maximum. The second radial section covers a radial region from the second radial location to a third radial location, corresponding to a radial location of an innermost segment of the multiple segments.of a segment of several segments that is located closest to the radial center in the radial direction. The third radial point is, in particular, closer to the radial center than the second radial point. The first radial segment can also be referred to here as the "segment with increasing stacking number," and the second radial segment can also be referred to here as the "segment with uniform stacking number."
[0085] The first tab coupling section can be coupled to the tab surface that overlaps the uniform stacking zone. The number of overlapping layers of the uniform stacking zone can be 5 or more, 6 or more, or 10 or more. The inventors have experimentally identified these configurations as advantageous.
[0086] The first tab coupling section may be welded to the tab surface, and a welded section of the tab coupling section may overlap at least 50% of the extent of the second radial section (the zone with uniform stacking number) along the radial direction of the electrode assembly.
[0087] The first uncoated area and the first tab coupling section can be coupled together by welding along the radial direction of the electrode assembly.
[0088] The first tab coupling section can be coupled to the first uncoated area by a weld parallel to a lower surface of the battery housing.
[0089] A weld bead formed between the first uncoated area and the first tab coupling section can form a straight weld pattern extending along a radial direction of the electrode assembly.
[0090] A weld bead formed between the first uncoated area and the first tab coupling section can form a weld pattern, and the weld pattern can have the form of a line formed by one or more weld points.
[0091] The width and / or radial extent of a weld bead formed between the first uncoated area and the first tab coupling section may be 0.1 mm or more, 0.2 mm or more, 0.3 mm or more, 0.5 mm or more, or 1 mm or more.
[0092] A multitude of first lug coupling sections and a multitude of first housing coupling sections can be provided, and the multitude of first lug coupling sections and the multitude of first housing coupling sections can be arranged in a radial pattern, a cross pattern, or a combined pattern with respect to a center of the first pantograph.
[0093] Each of the multiple first housing coupling sections can be positioned between the adjacent first tab coupling sections.
[0094] A multitude of first housing coupling sections can be provided, and the first contact sections of the multitude of first housing coupling sections can be interconnected and formed in one piece.
[0095] An outermost point of the first connecting section can be spaced a predetermined distance from a radially innermost point of the beaded section.
[0096] The angle between the first contact section and the first connecting section can be an acute angle due to the first bending section.
[0097] The first tab coupling section can have at least one insertion opening, and possibly a plurality of insertion openings. The plurality of insertion openings can be arranged symmetrically on the left and right sides with respect to a radial centerline of the first tab coupling section, particularly in a lateral direction. A weld bead that couples the first tab coupling section and the first uncoated area can be formed between the symmetrically arranged insertion openings, particularly on the left and right sides.
[0098] The circumferential extent of the first tab coupling section at a distal radial location may be greater than the circumferential extent of the first tab coupling section at a connecting section where the first tab coupling section and the support section are adjacent, particularly in the radial direction. The distal radial location may be farther from the radial center of the battery than the connecting section. Thus, the circumferential extent or width of the first tab coupling section at a distal radial location may be greater than at a proximal radial location that is closer to a radial distance of the battery.The circumference or width of the first tab coupling section can therefore taper inwards along the radial direction, at least over part of a radial extent of the first tab coupling section.
[0099] The insertion opening can be formed at the radial distal point or position.
[0100] At least part of an area in which the insertion opening(s) is / are formed may be contained in a first area of the first tab coupling section, which has a greater extent and / or width in the circumferential direction compared to an extent and / or width in the circumferential direction of a second area of the first tab coupling section, the second area being closer to the radial center of the battery than the first area.
[0101] One end of the first tab coupling section in the longitudinal direction, i.e., an end section of the first tab coupling section that is located furthest from a radial center of the battery, may have the shape of an arc corresponding to an inner circumferential surface of the battery casing.
[0102] The weld pattern formed between the first uncoated area and the first tab coupling section, and the weld pattern formed between the bead section and the first contact section, can extend perpendicular to each other.
[0103] The innermost radial point of the bead section can be closer in a radial direction to a radial center of the battery than an endpoint of the crimp section. The crimp section can extend from the bead section to the endpoint of the crimp section.
[0104] The sealing element can surround the housing cover, wherein the radial extent of a section (area) of the sealing element covering a lower surface of the housing cover may be smaller than the radial extent of a section (area) of the sealing element covering an upper surface of the housing cover.
[0105] If the total radial length of the first tab coupling section is denoted by T, the outer diameter of the electrode assembly is equal to JR, and the height of the segment positioned at a radially outermost point of the electrode assembly is equal to F, then the battery can satisfy the equation JR - 2*F ≤ T JR.
[0106] The ratio of a non-contact area between the first current collector and an upper surface of the electrode assembly to an area of a circle with an outer diameter corresponding to a diameter of the electrode assembly, as diameter, can be 30% or more and less than 100%, preferably 60% or more and less than 100%.
[0107] The diameter of the current collector opening can be smaller than the diameter of a winding opening in the core of the electrode assembly. If the diameter of the winding opening is designated R3, the diameter of the current collector opening can be 0.5*R3 or more and less than R3, or 0.7*R3 or more and less than R3.
[0108] A form factor ratio, obtained by dividing a battery's diameter by its height, can be greater than 0.4. For example, a battery might have a diameter of 46 mm and a height of 80 mm, resulting in a form factor of 46 / 80 of 0.575.
[0109] In preferred embodiments, a resistance measured or measurable between a positive electrode of the battery, which may correspond to one of the first and second electrodes, and a negative electrode of the battery, which may correspond to the other of the first and second electrodes, may be equal to or less than 4 mΩ, equal to or less than 1 mΩ, or equal to or less than 0.5 mΩ.
[0110] A battery according to a second aspect of the present invention can, in particular in addition to or instead of the first current collector and / or housing cover described above, have a current collector that is electrically coupled to the first uncoated area and to an inner surface of the battery housing, wherein the current collector can have a first section that contacts the inner surface of the battery housing and a second section that is electrically coupled to the first uncoated area, wherein a projection of at least a central area of the first section, projected onto a plane in which the second section extends, is separated from the second section in a circumferential direction of the electrode assembly. Such a battery can have any of the features of a battery according to the first aspect of the invention, as described above, or any combination thereof.
[0111] The circumferential direction can correspond to a direction parallel to a circumference of the battery. In the case of an essentially cylindrical battery, the circumferential direction can correspond to the circumferential direction mentioned above. This configuration of the projection of the central region of the first section, when projected onto the plane of the second section, can in particular imply that the first section, especially its central region, does not overlap the second section in the circumferential direction, with the first section and the second section extending in different planes, possibly corresponding to different heights above the base or the top of the battery.
[0112] In particular, the first section can be arranged in a first plane perpendicular to a height of the battery, the second section can be arranged in a second plane perpendicular to a height of the battery, wherein the first and the second plane can be spaced apart from each other in a direction parallel to the height of the battery.
[0113] The battery may also have a sealing element that is arranged between the opening section of the battery housing and the current collector.
[0114] The first section can be arranged between the inner surface of the battery casing and the sealing element, and the first section and the second section can be arranged on different planes in the winding axial direction of the electrode assembly.
[0115] The battery may have any of the features described above for a battery according to the first aspect of the invention, or any combination thereof.
[0116] To solve the problem described above, a current collector according to a third aspect of the present invention is a current collector that electrically connects an electrode arrangement and a battery housing attached to a battery and has a support section positioned on the electrode arrangement; a plurality of tab coupling sections extending from the support section and coupled to a first uncoated area of the electrode arrangement; and a first housing coupling section extending from the support section, arranged between the adjacent tab coupling sections and electrically coupled to a bead section of the battery housing.
[0117] In particular, a battery, as described above, can have such a current collector, wherein the current collector electrically connects the electrode assembly to the battery housing. The current collector, which can correspond to the "first current collector" of the battery described above, can have a plurality of tab coupling sections extending from the support section and coupled to a first uncoated region of the electrode assembly, wherein the plurality of tab coupling sections can include the "first tab coupling section" described above. The first housing coupling section can be arranged between adjacent tab coupling sections and be electrically connected to a corrugated section of the battery housing, which can in particular be formed by a corrugated section as described above.
[0118] In the current collector according to an embodiment of the present invention, the lug coupling section and the first housing coupling section can be indirectly connected by the support section.
[0119] The tab coupling section can have at least one insertion opening.
[0120] The first housing coupling section may include a first contact section connected to an inner surface of the battery housing; and a first connecting section connecting the support section to the first contact section.
[0121] The first connecting section can have at least one first bending section that changes at least once in the direction of expansion.
[0122] The pantograph can have a pantograph opening formed in its center.
[0123] The current collector may further comprise a second housing coupling section extending from one end of one of the plurality of tab coupling sections and connected to an inner surface of the battery housing.
[0124] The second housing coupling section may include a second contact section connected to an inner surface of the battery housing; and a second connecting section connecting the end of one of the plurality of tab coupling sections to the second contact section.
[0125] A multitude of first housing coupling sections can be provided, and the first contact sections of the multitude of first housing coupling sections can be interconnected and formed in one piece.
[0126] The angle between the contact section and the connecting section can be an acute angle due to the first bending section.
[0127] A variety of insertion ports can be provided.
[0128] The multitude of insertion openings can be arranged symmetrically on the left and right sides in a width direction with respect to a radial center line of the tab coupling section.
[0129] The tab coupling section may have a greater width at a point that is arranged at a predetermined distance, in particular radial distance, from a connecting section where the tab coupling section and the support section are connected and / or adjacent to each other, than at the connecting section.
[0130] The insertion opening can be formed at the point that is arranged at the predetermined distance from the connecting section.
[0131] At least part of an area in which the insertion opening is formed may be contained in an extended area located at the predetermined distance from the connected section, which has a width greater than the width of the connected section.
[0132] The end of the tab coupling section in the longitudinal direction can have the shape of an arc that corresponds to an inner circumferential surface of the battery housing.
[0133] A fourth aspect of the invention relates to a battery pack comprising a plurality of batteries according to one of the embodiments of the first to third aspects of the invention described above.
[0134] A terminal and an outer surface of the top of a battery casing of each battery can be arranged to face in the same direction. The "top" of a battery casing can, in particular, correspond to the side of the battery casing on which the corresponding terminal is located, which can correspond to a top base for the battery, for example, a top circular base of a cylindrical battery. In particular, a terminal and an outer surface of the top of a battery casing of each of the batteries in the battery pack can be arranged to face a plurality of busbars connecting the plurality of batteries in series and parallel.
[0135] Each of the plurality of busbars can be arranged over adjacent batteries, each of the plurality of busbars being able to have: a body section extending between terminals of adjacent batteries and / or between adjacent columns of batteries; a plurality of first busbar terminals extending from one side of the body section and electrically coupled to an electrode terminal of a battery located on one side of the busbar, for example, to the left of the busbar; and a plurality of second busbar terminals extending from the other side of the body section and electrically connected to an outer surface of a top of a battery casing of a battery located on the other side of the busbar, for example, to the right of the busbar.
[0136] Another aspect of the invention relates to a vehicle comprising a battery according to one of the embodiments of the first to third aspects of the invention, as described above, and / or a battery pack according to one of the embodiments of the fourth aspect of the invention, as described above. The vehicle can, for example, be an electric car. ADVANTAGES
[0137] According to the present invention, it is possible to significantly reduce the resistance when electrically connecting the current collector to the battery housing.
[0138] According to another aspect, it is possible according to the present invention to improve the coupling strength of the coupling section between the current collector and the battery housing.
[0139] According to another aspect, it is possible to improve the energy density of the battery according to the present invention.
[0140] According to another aspect, the present invention makes it possible to increase the practicality of the welding process for the electrical connection between the battery housing and the current collector during battery manufacturing in order to improve productivity.
[0141] According to another aspect, the present invention makes it possible to significantly reduce the probability of damage occurring to the welded section between the current collector and the electrode assembly and / or the welded section between the current collector and the battery housing when vibrations and shock loads are applied during battery use.
[0142] According to another aspect, the present invention makes it possible to increase the practicality of the welding process for the electrical connection between the battery housing and the current collector during battery manufacturing in order to improve productivity.
[0143] However, the effects that can be achieved by the present invention are not limited to the effects described above, and these and other effects will become clear to the person skilled in the art in view of the following description. FIGURE DESCRIPTION
[0144] The accompanying drawings illustrate a preferred embodiment of the present invention and, together with the following detailed description of the present invention, serve to provide a more precise understanding of the technical aspects of the present invention, whereby the present invention is not to be construed as being limited to the drawing. Fig. Figure 1 is a cross-sectional view showing the internal structure of a cylindrical battery according to an embodiment of the present invention. Fig. Figure 2 is a diagram showing a current collector (a first current collector) according to an embodiment of the present invention. Fig. 3 to Fig. Figure 5 shows exemplary forms of a first connecting section of a current collector (a first current collector) according to an embodiment of the present invention. Fig. 6 and Fig. Figure 7 are diagrams that show the shape of a first connection section as a function of the height of an electrode arrangement. Fig. Figure 8 is a diagram showing a current collector (a first current collector) according to a further embodiment of the present invention. Fig. Figure 9 is a diagram showing a current collector (a first current collector) according to yet another embodiment of the present invention. Fig. 10 is a diagram showing the exemplary form of a second connecting section of the in Fig. Figure 9 shows the pantograph (of a first pantograph). Fig. 11 and Fig. Figure 12 are diagrams showing a current collector (a first current collector) of the present invention, which has a different shape than those described and shown in the previous embodiments. Fig. 13 is a diagram showing the internal structure of a cylindrical battery with the in Fig. The diagram shows 12 pantographs (a first pantograph). Fig. Figure 14 is a top view showing a current collector (a first current collector) according to the present invention coupled to a battery housing. Fig. Figure 15 is an enlarged diagram of the upper part of an electrode arrangement of the present invention. Fig. Figure 16 is an enlarged diagram of the upper part of an uncoated area of Fig. 15. Fig. Figure 17 is a diagram illustrating a welding process of a pantograph (a first pantograph). Fig. Figure 18 is a diagram illustrating a beading process of a battery casing. Fig. Figure 19 is a diagram illustrating a crimping process of a battery casing. Fig. Figure 20 is a diagram illustrating a dimensioning process for a battery housing. Fig. Figure 21 is a diagram illustrating a change in the shape of a pantograph (a first pantograph) after a dimensioning process as a function of the shape of the pantograph before the dimensioning process. Fig. 22 and Fig. Figure 23 are diagrams illustrating the shape of a pantograph (a first pantograph) configured to maintain a welding area after a dimensioning process. Fig. Figure 24 is a diagram illustrating the position, length and width of a weld bead formed at a weld area between a contact section and a bead section of a current collector (a first current collector) of the present invention. Fig. Figure 25 is a diagram showing an embodiment of a current collector (a second current collector) applied to the present invention. Fig. 26 is a diagram showing a pantograph (a second pantograph) of a different embodiment than the one in Fig. The second pantograph shown is shown in the 25th image. Fig. Figure 27 is a top view showing an exemplary electrode structure according to a preferred embodiment of the present invention. Fig. Figure 28 is a cross-sectional view along a longitudinal direction Z showing an electrode assembly in which a segment structure of an uncoated area of a first electrode is also applied to a second electrode according to an embodiment of the present invention. Fig. Figure 29 is a cross-sectional view of an electrode assembly along a longitudinal direction Z with a curved uncoated area according to an embodiment of the present invention. Fig. Figure 30 is a perspective view of an electrode assembly with a curved uncoated area according to an embodiment of the present invention. Fig. Figure 31 is a top view showing a plurality of cylindrical batteries according to an embodiment of the present invention, connected in series and parallel using busbars. Fig. Figure 32 is a diagram showing a schematic configuration of a battery pack with cylindrical batteries according to an embodiment of the present invention. Fig. Figure 33 is a diagram showing a schematic configuration of a vehicle with a battery pack according to an embodiment of the present invention. OPTIMAL EXECUTION
[0145] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. At the outset, it should be made clear that the terms or words used in the description and the accompanying claims are not to be interpreted as being limited to general and literal meanings, but rather should be interpreted on the basis of the meanings and concepts that correspond to the technical aspects of the present invention, based on the principle that the inventor may appropriately define the terms for the best explanation.Therefore, the embodiments and illustrations described here, shown in the drawings, are only some of the most preferred embodiments of the present invention, but are not intended to fully describe the technical aspects of the present invention, so that it should be clear that a variety of other equivalents and modifications to it could have been made at the time of filing the application.
[0146] In addition, to facilitate understanding of the present invention, the accompanying drawings may illustrate some elements in exaggerated dimensions and not to actual scale. Furthermore, the same element may be provided with the same reference numeral in different embodiments.
[0147] When two components are described as equivalent, this means they are "essentially the same." Accordingly, "essentially the same" can encompass all cases where the deviation is considered low in the relevant technical field, for example, a deviation of 5% or less. Additionally, a uniform parameter within a range can be described as uniform from an average perspective.
[0148] With reference to Fig. In one embodiment of the present invention, a cylindrical battery 1 comprises an electrode assembly 10, a battery housing 20, a current collector (a first current collector) 30, a housing cover 40, and a terminal 50. The cylindrical battery 1 may further comprise a sealing element G1 and / or an insulating element G2 and / or a current collector (a second current collector) 60 and / or an insulator 70.
[0149] The present invention is not limited to the shape of the battery and can therefore be applied to any battery of a different shape, for example a prismatic battery.
[0150] The electrode assembly 10 has a first uncoated region 11 and a second uncoated region 12. In particular, the electrode assembly 10 has a structure in which a first electrode, a second electrode, and a separator arranged between the first and second electrodes are wound around a winding axis that defines a core and an outer circumferential surface. That is, the electrode assembly 10 applied to the present invention can be a jelly-roll type electrode assembly. In this case, an additional separator can be provided on the outer circumferential surface of the electrode assembly 10 for insulation from the battery housing 20. The electrode assembly 10 can have any known winding structure without restriction.
[0151] The first electrode comprises a first electrode current collector and a first electrode active material, which is coated on one or two surfaces of the first electrode current collector. An uncoated area, where the first electrode active material is not applied (coated), exists at one end of the first electrode in the lateral direction (parallel to the direction parallel to the height of the electrode). Fig. 1 cylindrical battery 1). That is, the first electrode has the uncoated area which is not coated with the active material and is exposed to the outside of the separator at the end of the long side along the winding direction. The uncoated area, which serves as a first electrode tab, is hereinafter referred to as the first uncoated area 11. The first uncoated area 11 is provided on the electrode assembly 10, which is located in the battery housing 20 in the direction parallel to the height (parallel to the direction parallel to the height of the Fig. The cylindrical battery shown in Figure 1) is included. That is, the first electrode has the first uncoated area, which is not coated with the active material layer and is exposed to the outside of the separator at the end of the long side, and at least part of the first uncoated area itself is used as the electrode tab. The first uncoated area 11 can, for example, be a negative electrode tab.
[0152] Meanwhile, at least part of the first uncoated area 11 can have several segments divided along the winding direction of the electrode assembly 10. In this case, the several segments (11a in Fig. 30) be bent along the radial direction of the electrode assembly 10.
[0153] With reference to the Fig. 15 and Fig. 16 together with Fig. 1. The multiple curved segments of the first uncoated area 11 can overlap each other in multiple layers to form a tab surface (a coupling surface) 102. In this case, a tab coupling section (a first tab coupling section) 32 of the current collector (the first current collector) 30 can be coupled to the tab surface 102, as described below. The tab coupling section 32 can be coupled to an area where the multiple segments overlap in multiple layers. The tab surface 102 can have a zone with increasing stacking number, in which the number of overlapping layers of the segments successively increases to a maximum as it moves from the outer circumference of the electrode assembly 10 to the core, and a zone with a uniform stacking number, from a radial location where the number of overlapping layers is at its maximum to a radial location where the innermost segment emerges.
[0154] In this case, if the tab coupling section (the first tab coupling section) 32 is located on the tab surface 102 of the first uncoated area 11, welding can be performed at a predetermined area. That is, the tab coupling section 32 can be coupled to the area where the multiple segments of the first uncoated area 11 overlap each other in multiple layers. For example, the tab coupling section 32 can be coupled to the tab surface 102 such that it overlaps the zone with a uniform stacking number. With reference to Fig. 16. Welding between the tab coupling section 322 and the first uncoated area 11 can be carried out in the region where the number of overlapping layers of the first uncoated area 11 is approximately 10 or more in the tab surface 102 of the first uncoated area 11. The ratio for the region in the radial direction where the number of overlapping layers is ten or more can be designed as approximately 25% or more with respect to the radius of the electrode arrangement 10, except for the core, by adjusting the length of the first uncoated area 11.
[0155] The tab coupling section (the first tab coupling section) 32 of the current collector (the first current collector) 30 can be coupled to the tab surface 102 such that it overlaps with the zone with a uniform number of stacks. Preferably, the tab coupling section 32 can be welded to the tab surface 102, and the weld area of the tab coupling section 32 can overlap with the zone with a uniform number of stacks by at least 50% along the radial direction of the electrode arrangement 10. Preferably, the number of overlapping layers of the zone with a uniform number of stacks can be approximately 10 or more.
[0156] When the current collector 30 is welded to the tab surface 102 of the first uncoated area 11, it is desirable to increase the laser power to ensure sufficient weld strength. However, increasing the laser power allows the laser to penetrate the electrode assembly 10 through the overlap area of the first uncoated area 11, potentially damaging the separator and the active material layer. To prevent this laser penetration, it is therefore desirable to increase the number of overlapping layers of the first uncoated area 11 beyond a predetermined level. Increasing the number of overlapping layers of the first uncoated area 11 requires increasing the segment height. However, increasing the segment height can lead to swelling in the first uncoated area 11 during the manufacturing process of the first electrode current collector.It is therefore possible to adjust the height of the segment to a suitable level.
[0157] If, as described above, the length ratio in the radial direction with respect to the radius of the electrode arrangement, in which the number of overlapping layers of the segments of the uncoated area is 10 or more, is designed as 25% or more, and the area in which the segments of the uncoated area overlap in 10 or more layers, and the current collector 30 is welded using a laser, even though the power of the laser increases, the overlap area of the uncoated area sufficiently masks the laser, thus preventing the separator and the active material layer from being damaged by the laser.
[0158] Preferably, the laser power can be appropriately set in the range of approximately 250 W to 320 W or in the range of approximately 40% to 90% of the maximum laser power specification, but the present invention is not limited thereto. If the laser power meets the numerical range described above, it is possible to sufficiently increase the weld strength. In one example, the weld strength can increase to 2 kgf / cm² or more, and preferably to 4 kgf / cm² or more. The weld strength can preferably be set to 8 kgf / cm² or less, and more preferably to 6 kgf / cm² or less. The weld strength is defined as the tensile force (kgf / cm²) per unit area of the current collector 30 at the time when the current collector begins to detach from the lug surface. In particular, after the welding of the current collector is complete, the current collector is subjected to a gradually increasing tensile force.As the tensile force increases, the uncoated area begins to detach from the weld interface. In this case, the weld strength is a value obtained by dividing the tensile force exerted on the current collector by the area of the current collector.
[0159] Fig. Figure 16 is a partial cross-sectional view of the electrode assembly contained in a cylindrical battery with a 4680 form factor, a radius of 22 mm, and a core radius of 4 mm. The view shows the tab surface where the first uncoated area 11 of the first electrode current collector, which is divided into multiple segments, is bent from the outer circumference toward the core and overlaps in ten or more layers. The surface of the electrode assemblies and the core surface, which do not contain a segment, are not shown in the drawing. The height of the segment increases by 1 mm for every 1 mm increase in the radius of the electrode assembly, starting at 3 mm. Additionally, after the length reaches 6 mm, 7 mm, or 8 mm, as shown in the drawing, the height of the segment is kept substantially constant.
[0160] With reference to Fig. Figure 16 shows that the number of overlapping layers of the first uncoated region 11 gradually increases as it goes from the outer perimeter to the core, and as the length of the first uncoated region 11 increases, the maximum value of the number of overlapping layers increases.
[0161] For example, if the length of the first uncoated region 11 is 8 mm, the number of overlapping layers of the first uncoated region 11, which is divided into several segments, increases to 18 layers in the region from the outer circumferential surface of the electrode assembly to 7 mm. The number of overlapping layers of the first uncoated region 11 is maintained at a maximum level of 18 layers in the region from 8 mm towards the core and decreases by 1-2 layers in the radial region adjacent to the core. The height of the segment gradually increases in radius from 3 mm to 8 mm in the region from 7 mm to 12 mm. In the present invention, the zone with a uniform number of layers is defined as a radial region from the radial location where the number of overlapping layers reaches its maximum to the location where the innermost segment is arranged, as shown in Fig. 16 shown. Accordingly, the ratio of the zone with uniform stacking number, in which the segments of the first uncoated area 11 overlap in 10 or more layers, to the radius of the electrode assembly excluding the core (4 mm) is 44.4% (8 / 18).
[0162] For example, if the length of the first uncoated area 11 is 7 mm, the number of overlapping layers of the first uncoated area 11, which is divided into several segments, increases to 15 layers in the area from the outer circumferential surface of the electrode assembly to 6 mm. The number of overlapping layers of the first uncoated area 11 is maintained uniformly at a maximum level of 15 layers in the area from 9 mm towards the core and decreases by 1-2 layers in the radial area adjacent to the core. The height of the segment increases stepwise in radius from 3 mm to 7 mm in the area from 7 mm to 11 mm. Accordingly, the ratio of the zone with a uniform stacking number, in which the segments of the first uncoated area 11 overlap in 10 or more layers, to the radius of the electrode assembly, excluding the core (4 mm), is 50% (9 / 18).
[0163] For example, if the length of the first uncoated area 11 is 6 mm, the number of overlapping layers of the first uncoated area 11, which is divided into several segments, increases to 12 layers in the 5 mm radius from the outer circumferential surface of the electrode assembly. The number of overlapping layers of the first uncoated area 11 is maintained uniformly at a maximum level of 12 layers in the 10 mm radius towards the core and decreases by 1-2 layers in the radial area adjacent to the core. The height of the segment increases from 3 mm to 6 mm in the 7 mm to 10 mm radius. Accordingly, the ratio of the zone with a uniform stacking number, in which the segments of the first uncoated area 11 overlap in 10 or more layers, to the radius of the electrode assembly, excluding the core (4 mm), is 55.6% (10 / 18).
[0164] According to one embodiment, the length of the area increases with the successively increasing number of overlapping layers from 5 mm to 7 mm with the increasing length of the first uncoated area 11, whereby it can be seen in particular that the requirement is met according to which the ratio of the zone with a uniform number of stacks, in which the number of stacked layers is 10 or more, to the radius of the electrode assembly excluding the core is 25% or more.
[0165] In the present invention, the uniform stacking zone can be increased or decreased around the core radius, the minimum and maximum segment heights in the variable segment height zone, and the increase in segment height in the radial direction of the electrode assembly. Accordingly, it is highly advantageous for the person skilled in the art to define the corresponding ratio as 25% or more by adjusting the factors that influence the uniform stacking zone ratio. For example, it is possible to increase the number of stacked layers and decrease the uniform stacking zone ratio to the level of 25% by increasing both the minimum and maximum segment heights in the variable segment height zone.
[0166] The zone with a uniform number of stacks is an area where the current collector can be welded. Therefore, if the ratio of the zone with a uniform number of stacks is set to 25% or more, it is possible to ensure the weld strength of the current collector in the preferred area, and this is advantageous with regard to the resistance of the weld interface.
[0167] The second electrode has a second electrode current collector and a second electrode active material coated on one or two surfaces of the second electrode current collector. An uncoated area, not coated with the second electrode active material, exists at the other end of the second electrode in the lateral direction (parallel to the direction parallel to the height of the electrode). Fig. 1 shown in the cylindrical battery 1). That is, the second electrode has an uncoated area that is not coated with an active material and is exposed to the outside of the separator at the end of the long side along the winding direction. The uncoated area, which serves as a second electrode tab, is referred to below as the second uncoated area 12. The second uncoated area 12 is provided below the electrode assembly 10, which is accommodated in the battery housing 20 in a direction parallel to its height. That is, the second electrode has a second uncoated area that is not coated with the active material layer and is exposed to the outside of the separator at the end of the long side, and at least part of the second uncoated area itself is used as an electrode tab. The second uncoated area 12 can, for example, be a positive electrode tab.
[0168] Meanwhile, at least part of the second uncoated area 12 may have several segments separated along the winding direction of the electrode assembly 10. In this case, the multiple segments may be bent along the radial direction of the electrode assembly 10.
[0169] With reference to the Fig. 15 and Fig. 16 together with Fig. 1. The multiple curved segments of the second uncoated area 12 can overlap each other in multiple layers to form the tab surface (the coupling surface) 102. In this case, a tab coupling section (a second tab coupling section) 62 of the current collector (the second current collector) 60 can be coupled to the tab surface 102, as described below. The tab coupling section 62 can be coupled to the area where the multiple segments overlap in multiple layers. The tab surface 102 can have a zone with increasing stacking number, in which the number of overlapping layers of the segments successively increases to a maximum as it moves from the outer circumference of the electrode assembly 10 to the core, and a zone with a uniform stacking number from a radial location where the number of overlapping layers is at its maximum to a radial location where the innermost segment is present.
[0170] The lug coupling section (the second lug coupling section) 62 of the current collector (the second current collector) 60 can be coupled to the lug surface such that it overlaps with the zone with a uniform number of stacks. Preferably, the lug coupling section 62 can be welded to the lug surface 102, and the weld area of the lug coupling section 62 can overlap at least 50% with the zone with a uniform number of stacks along the radial direction of the electrode assembly 10. Preferably, the number of overlapping layers of the zone with a uniform number of stacks can be approximately 10 or more.
[0171] When the first current collector 30 and / or the second current collector 60 is welded to the approximately flat coupling surface 102, which is formed by bending the first uncoated area 11 and / or the second uncoated area 12, it is desirable to increase the laser power to ensure sufficient weld strength. However, if the laser power increases, the laser could penetrate the electrode assembly 10 through the overlap area of the first uncoated area 11 and / or the second uncoated area 12, potentially damaging the separator and the active material layer. Therefore, to prevent laser penetration, it is advantageous to increase the number of overlapping layers of the first uncoated area 11 and / or the second uncoated area 12 above a predetermined level.To increase the number of overlapping layers of the first uncoated area 11 and / or the second uncoated area 12, it is necessary to increase the height of the segment. However, if the height of the segment increases, swelling may occur in the first uncoated area 11 and / or the second uncoated area 12 during the manufacturing process of the electrode plate. It is therefore advisable to adjust the height of the segment to a suitable level.
[0172] If the electrode arrangement is designed as described above such that the radial length of the area in which the number of overlapping layers of the segments of the first uncoated area 11 and / or the second uncoated area 12 is 10 or more is approximately 25% or more in relation to the radius of the electrode assembly 10, and welding is carried out in the target welding area even though the power of the laser increases, the overlap section of the first uncoated area 11 and / or the second uncoated area 12 sufficiently masks the laser, thus preventing the separator and the active material layer from being damaged by the laser.
[0173] In the present invention, the positive electrode active material applied (coated) to the positive electrode plate and the negative electrode active material applied (coated) to the negative electrode plate can comprise any known active material without restriction.
[0174] In one example, the positive electrode active material can consist of an alkali metal compound which can be described by a general formula A[A x M y ]O 2+z is represented (A has at least one of Li, Na or K; M has at least one selected from Ni, Co, Mn, Ca, Mg, Al, Ti, Si, Fe, Mo, V, Zr, Zn, Cu, Al, Mo, Sc, Zr, Ru and Cr; x ≥ 0.1 ≤ x + y ≤ 2, 0.1 ≤ z ≤ 2; and the stoichiometric coefficients x, y and z are selected such that the compound is kept electrically neutral).
[0175] In another example, the positive electrode active material can be an alkali metal compound xLiM. 1 O2-(1-x)Li2M 2 exhibiting O3, which is disclosed in US6,677,082, US6,680,143, et al. (M1 has at least one element with an average oxidation state of 3; M2 has at least one element with an average oxidation state of 4; 0 ≤ x ≤ 1).
[0176] In yet another example, the positive electrode active material can consist of lithium metal phosphate, which can be described by a general formula Li a M 1 x Fe 1-x M 2 y P 1-y M 3 z O 4-z is shown (M 1 includes at least one selected from Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg and Al; M 2 includes at least one selected from Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg, Al, As, Sb, Si, Ge, V and S; M 3has a halogen group element, optionally F; 0 a ≤ 2.0 ≤ x ≤ 1.0 ≤ y 1.0 ≤ z 1; the stoichiometric coefficients a, x, y and z are selected to keep the compound electrically neutral), or Li3M2(PO4)3 (M has at least one selected from Ti, Si, Mn, Fe, Co, V, Cr, Mo, Ni, Al, Mg and Al).
[0177] Preferably, the positive electrode active material can comprise primary particles and / or secondary particles formed by agglomeration of the primary particles.
[0178] In one example, the negative electrode active material can consist of carbon materials, lithium metal or lithium metal compounds, silicon or silicon compounds, and tin or tin compounds. Additionally, the negative electrode active material can include metal oxides such as TiO₂ and SNO₂ with a potential of less than 2 V. The carbon material can be low-crystalline or high-crystalline carbon.
[0179] The separator can have a porous polymer film, for example, a porous polymer film made from a polyolefin-based polymer such as ethylene homopolymer, propylene homopolymer, ethylene / butene copolymer, ethylene / hexene copolymer, and ethylene / methacrylate copolymer, used individually or in stacks. Alternatively, the separator can have a commonly used porous nonwoven fabric, for example, a nonwoven fabric made from high-melting-point glass fibers and polyethylene terephthalate fibers.
[0180] The separator can have a coating layer of inorganic particles on at least one of its surfaces. The separator itself can be a coating layer of inorganic particles. The particles in the coating layer can be bound with a binder, so that an interstitial volume exists between adjacent particles.
[0181] The inorganic particles may comprise an inorganic material with a dielectric constant of 5 or higher. A non-restrictive example of the inorganic particles may include at least one selected from the group consisting of Pb(Zr,Ti)O3 (PZT), Pb 1-x La x Zr 1-y Ti y O3 (PLZT), PB(Mg3Nb 2 / 3 )O3-PbTiO3 (PMN-PT), BaTiO3, Hafnium oxide (Hfo2), (HfO2), SrTiO3, TiO2, Al2O3, ZrO2, SnO2, CeO2, MgO, CaO, ZnO and Y2O3.
[0182] An electrolyte can be a salt with a structure of A+B-. Here, A+ represents an alkali metal cation such as Li+, Na+, and K+, or a combination thereof. B- has at least one anion selected from the group consisting of F-, Cl-, Br-, I-, NO3-, N (CN)2-, BF4-, ClO4-, AlO4-, AlCl4-, PF6-, SbF6-, AsF6-, BF2C2O4-, BC4O8-, (CF3)2PF4-, (CF3)3PF3-, (CF3)4PF2-, (CF3)5PF-, (CF3)6P-, CF3SO3-, C4F9SO3-, CF3CF2SO3-, (CF3SO2)2N-, (FSO2)2N-, CF3CF2, (CF3)2CO-, (CF3SO2)2CH-, (SF5)3C-, (CF3SO2)3C-, CF3, (CF2)7SO3-, CF3CO2-, CH3CO2-, SCN- and (CF3CF2SO2)2N- consists.
[0183] The electrolyte may be dissolved in an organic solvent. The organic solvent may contain at least one of the following: propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran, N-methyl-2-pyrrolidone (NMP), ethyl methyl carbonate (EMC), or γ-butyrolactone.
[0184] With reference to Fig. 1. The battery casing 20 is an essentially cylindrical container with an opening on one side and is made of a metal with conductive properties. In general, the side of the battery casing 20 and the bottom surface (the bottom surface in Fig. 1) which is located on the side opposite the opening section, is formed in one piece. That is, in general, the battery housing 20 has an open top and a closed bottom in the direction parallel to the height. The lower surface of the battery housing 20 can have an approximately flat shape. The battery housing 20 receives the electrode assembly 10 through the opening section, which is formed on one side in the direction parallel to the height (parallel to the Z-axis). The battery housing 20 can also receive the electrolyte through the opening section.
[0185] The battery housing 20 can have a beaded section 21 at the end adjacent to the opening section, which is provided on the top surface of the battery housing 20. The battery housing 20 can further have a crimped section 22 on the beaded section 21. The beaded section 21 is configured such that the edge of the outer circumferential surface of the battery housing 20 is pressed in to a predetermined depth.
[0186] The insertion depth of the corrugated section 21 can, for example, be approximately 0.2 to 10 mm. The minimum insertion depth PD of the corrugated section 21 requires consideration of the radius of curvature R1 of the corrugated section 21 and the width W. bead of the weld bead and the radius of curvature R2 at the boundary between the bead section 21 and the inner surface of the battery housing 20. For example, welding with reference to Fig. In addition to the radius of curvature R1 of the bead section 21 and the radius of curvature R2 at the boundary between the bead section 21 and the inner surface of the battery housing 20, an additional space is required. This is because there is no flat area F on the bead section 21 when the insertion depth PD is R1 + R2. Furthermore, the welding requires the additional space, which is greater than the minimum width W. bead,min of the sweat bulge BD is. PD≥R1,min+R2,min+Wbead,min
[0187] For example, the minimum value of each of R1, min and R2 min approximately 0.05 mm and W bead,min can be approximately 0.1 mm. In this case, the minimum value of the insertion depth PD can be approximately 0.2 mm or more.
[0188] According to another aspect, the maximum insertion depth PD of the corrugated section 21 can vary depending on the material and thickness of the battery housing 20. For example, if the battery housing 20 is made of steel and has a maximum thickness of approximately 1 mm, the maximum insertion depth PD of the corrugated section 21 can be approximately 10 mm. Therefore, in this example, the insertion depth PD of the corrugated section 21 can range from approximately 0.2 to 10 mm.
[0189] The bead section 21 is formed on the electrode assembly 10. The inner diameter of the battery housing 20 in the area where the bead section 21 is formed is smaller than the diameter of the electrode assembly 10. The bead section 21 can have an upper bead section, located on the upper part with respect to the innermost inner surface when the battery housing 20 is recessed, and a lower bead section, located on the lower part with respect to the innermost inner surface when the battery housing is pressed in. At least one tab coupling section 32 of the current collector 30, as described below, can be located at the lower position than the lower bead section.
[0190] The upper corrugated section and / or the lower corrugated section can be inclined at a predetermined angle to the lower surface of the battery housing 20. In this case, a first contact section 33a of the current collector (the first current collector) 30 can be seated on the inclined upper surface of the upper corrugated section of the corrugated section 21, as described below.
[0191] Alternatively, the upper corrugated section and / or the lower corrugated section can be approximately parallel to the lower surface of the battery housing 20 in at least some areas. In this case, the first contact section 33a of the current collector 30 can be located on the approximately flat upper surface of the upper corrugated section, as described below. The first contact section 33a can have the flat surface that is coupled to the upper surface of the corrugated section 21 facing the opening section of the battery housing 20.
[0192] The corrugated section 21 provides a support surface on which the housing cover 40 can sit. Additionally, the corrugated section 21 can provide the support surface where at least a portion of the circumferential edge of the current collector 30, as described below, can sit and be coupled. That is, at least a portion of the circumferential edge of the current collector 30 of the present invention and / or the circumferential edge of the housing cover 40 can sit on the upper surface of the upper corrugated section. In order to stably support at least a portion of the circumferential edge of the current collector 30 and / or the circumferential edge of the housing cover 40, the upper surface of the upper corrugated section can extend in a direction approximately parallel to the lower surface of the battery housing 20, i.e., in a direction approximately perpendicular to the side wall of the battery housing 20.The corrugated section 21 can be omitted, and at least part of the circumferential edge of the current collector 30 can be attached directly to the flat side wall of the battery housing 20.
[0193] With reference to Fig. 20 together with Fig. 1. The bead section 21 can have an upper bead section and a lower bead section, which are arranged at upper and lower locations respectively with respect to the innermost side along the pressing direction. The upper bead section and the lower bead section can have an asymmetrical shape. In particular, the upper bead section and the lower bead section can have an asymmetrical shape with respect to an imaginary reference plane that runs parallel to the bottom surface of the battery housing 20 through the innermost radial location of the bead section. The asymmetrical shape can be formed by a dimensioning process during the process of compressing the battery housing 20 along the direction parallel to the height (parallel to the Z-axis) of the battery housing 20.The dimensioning process is a process of adjusting the height of the cylindrical battery 1 to the design form factor by pressing the battery housing 20 along the winding axis direction of the electrode arrangement 10.
[0194] The upper bead section can have a flat portion that is approximately parallel to the closed section of the battery housing 20. In contrast, due to its asymmetrical shape, the lower bead section can be inclined at least partially downwards in one direction towards the innermost side. Accordingly, the lower bead section can secure the electrode assembly 10 by pressing it down. The bead section 21 prevents the electrode assembly 10, which has a size approximately equal to the inner diameter of the battery housing 20, from sliding through the opening formed on top of the battery housing 20 and acts as a support section on which the housing cover 40 sits.The upper corrugated section can act as the support section for holding not only the housing cover 40, but also the first contact section 33a of the current collector (of the first current collector) 30 and the sealing element G1.
[0195] The crimp section 22 is formed on the bead section 21. The crimp section 22 can extend along the circumferential edge of the housing cover 40 and be bent, which is positioned on the bead section 21. This shape of the crimp section 22 fixes the housing cover 40 to the bead section 21. The crimp section 22 can be omitted, and the housing cover 40 can be fixed by another fixing structure to cover the opening section of the battery housing 20. The innermost radial point of the bead section 21 can be located at a position closer to the end of the crimp section 22 along the radial direction of the electrode assembly 10. For example, with reference to Fig. 1. The end of the crimp section 22 is positioned at a more radially outward position than the innermost radial position of the bead section 21. This structure makes it possible to keep the bead section 21 relatively flat after the dimensioning process. If, for example, the radially innermost position of the bead section 21 is positioned at a more radially outward position than the end of the crimp section 22, the radial length of the upper surface of the crimp section 22 is longer than the radial length of the bead section 21. As a result, the upper surface of the crimp section 22, which is subjected to pressure during the dimensioning process, becomes wider, and the bead section 21 cannot be flattened after the dimensioning process.
[0196] Subsequently, the current collector (the first current collector) 30 is, according to an embodiment of the present invention, with reference to the Fig. 1 to Fig. 5 described in detail.
[0197] With reference to the Fig. 1 and Fig. 2. According to one embodiment of the present invention, the current collector 30 is first received in the battery housing 20 and electrically connected to the electrode assembly 10 as well as electrically connected to the battery housing 20. That is, the current collector 30 electrically connects the electrode assembly 10 to the battery housing 20.
[0198] The current collector 30 has a support section 31 arranged on a surface of the electrode assembly 10, a plurality of tab coupling sections (the plurality of first tab coupling sections) 32 coupled to the first uncoated area 11, and a plurality of first housing coupling sections 33 extending from the support section 31 and coupled to the inner surface of the battery housing 20. The tab coupling section 32 and the first housing coupling section 33 are indirectly connected through the support section 31 and are not directly connected to each other. Therefore, the probability of damage to the coupling section between the current collector 30 and the electrode assembly 10 and the coupling section between the current collector 30 and the battery housing 20 can be minimized when external shock loads are applied to the cylindrical battery 1 of the present invention.At least one lug coupling section 32 and / or at least one first housing coupling section 33 can be provided. The at least one lug coupling section 32 and the at least one first housing coupling section 33 can, for example, be arranged in an approximately radial pattern, an approximately cross-shaped pattern, or a combined pattern with respect to the center of the pantograph 30. Alternatively, each of the plurality of first housing coupling sections 33 can be arranged between the adjacent lug coupling sections 32.
[0199] The support section 31 and the plurality of tab coupling sections 32 are arranged on the electrode assembly 10. The tab coupling section 32 is coupled to the first uncoated area 11 of the electrode assembly 10. For example, the tab coupling section 32 can be coupled to the first uncoated area 11 by welding along the radial direction of the electrode assembly 10. For example, the tab coupling section 32 can be coupled to the first uncoated area 11 by welding approximately parallel to the lower surface of the battery housing 20. For example, the weld bead formed between the first uncoated area 11 and the tab coupling section 32 can form the weld pattern in the shape of an approximately straight line extending along the radial direction of the electrode assembly 10.For example, the welding pattern can have the form of a line formed by connecting weld spots. The welding pattern can comprise one, two, or more patterns extending along the radial direction of the electrode arrangement 10.
[0200] Meanwhile, not only the tab coupling section 32, but also the support section 31 can be coupled to the first uncoated area 11. The tab coupling section 32 and the first uncoated area 11 can be coupled by welding. If the battery housing 20 has the corrugated section 21, the support section 31 and the tab coupling section 32 are located at a lower position than the corrugated section 21.
[0201] The support section 31 can have a current collector opening H2 formed at a location corresponding to a winding opening H1 formed approximately in the center of the electrode assembly 10. The winding opening H1 and the current collector opening H2, which are interconnected, can serve as a passage for inserting a welding rod for welding between the terminal 50 and the current collector (the second current collector) 60, or for welding between the terminal 50 and a conductor lug (not shown), or, as described below, for laser beam irradiation. The current collector opening H2 can have a diameter substantially larger than or equal to that of the winding opening H1 of the electrode assembly 10, so as not to cover the winding opening H1 formed in the core of the electrode assembly 10.If the diameter of the current collector opening H2 is much smaller than the diameter of the winding opening H1, the opening formed at the winding opening H1 will be covered, resulting in impaired fluid inlet, and additionally, it may be difficult to have sufficient space to insert the device for welding or laser irradiation.
[0202] In contrast to the embodiment described above, according to another embodiment of the present invention, the diameter of the current collector opening H2 can be smaller than the winding opening H1. In this case, for example, if the diameter of the winding opening H1 is R3, the diameter of the current collector opening H2 can be approximately 0.5·R3 or more and less than R3, and preferably approximately 0.7·R3 or more and less than R3. Generally, during venting by strong pressure from gas escaping at the winding center of the electrode assembly 10, the separator or the uncoated area at the winding center can slip off the upper surface of the electrode assembly 10.In this case, if the diameter of the current collector opening H2 is smaller than the diameter of the opening provided on the core of the electrode assembly 10, the separator or the uncoated area at the winding center can be prevented from slipping off the electrode assembly 10. However, if the diameter of the current collector opening H2 is too small, it may be difficult to introduce the electrolyte solution, and since space is required for welding between the second current collector 60 and the terminal 50, the diameter of the current collector opening H2 is preferably 0.5·R3 or more, and more preferably 0.7·R3 or more.
[0203] The plurality of tab coupling sections 32 can extend approximately radially from the support section 31 of the current collector 30 to the side wall of the battery housing 20. Each of the plurality of tab coupling sections 32 can be spaced apart from one another along the circumference of the support section 31. To ensure coupling strength and to reduce electrical resistance through the increased coupling area between the current collector 30 and the electrode assembly 10, not only the tab coupling section 32 but also the support section 31 can be coupled to the first uncoated area 11. At least part of the first uncoated area 11 can be formed such that its end is bent approximately parallel to the tab coupling section 32. In this case, the bending can, for example, be in the direction of the winding center C of the electrode assembly 10.If the first uncoated area 11 is coupled to the tab coupling section 32 by end forming parallel to the tab coupling section 32, the coupling area can be increased, thereby improving the coupling strength and reducing the electrical resistance, and it is possible to minimize the height of the electrode arrangement 10, thus improving the energy density. Meanwhile, the bent ends of the first uncoated area 11 can overlap in several layers. If the first uncoated area 11 overlaps in several layers, the tab coupling section 32 of the current collector 30 can be connected to the coupling surface 102 (see figure 1). Fig. 15 and Fig. 16) be coupled, which is formed by bending the first uncoated area 11 in such a way that it overlaps in several layers as described above.
[0204] The plurality of first housing coupling sections 33 can extend approximately radially from the support section 31 of the current collector 30 to the side wall of the battery housing 20. Each of the plurality of first housing coupling sections 33 can be spaced apart from one another along the circumference of the support section 31. At least one first housing coupling section 33 can be arranged between the adjacent lug coupling sections 32. The plurality of first housing coupling sections 33 can, for example, be coupled to the corrugated section 21 on the inner surface of the battery housing 20. In particular, the first housing coupling sections 33 can be coupled to the upper surface of the corrugated section 21.In the cylindrical battery 1 according to the present invention, if its structure is used, the first housing coupling section 33 can be automatically seated on the corrugated section 21 within the battery housing 20 by the process of receiving the electrode assembly 10, which includes the current collector 30. Accordingly, the welding process of the battery housing 20 and the current collector 30 can be carried out very simply. For example, laser welding, ultrasonic welding, or spot welding can be used for the coupling between the battery housing 20 and the current collector 30. If a multi-current path is formed by coupling the first housing coupling section 33 to the corrugated section 21 by welding, the resistance level can be limited to approximately 4 mΩ or less, which is suitable for fast charging.Additionally, if the upper surface of the corrugated section 21 extends along a direction approximately parallel to the lower surface of the battery housing 20, i.e., a direction approximately perpendicular to the side wall of the battery housing 20, and the first housing coupling section 33 also extends along the same direction, i.e., the radial and circumferential directions, the first housing coupling section 33 can make stable contact with the corrugated section 21. Furthermore, since the first housing coupling section 33 makes stable contact with the corrugated section 21, it is possible to smoothly weld the two components, thereby improving the coupling strength between the two components and minimizing the resistance increase at the coupled section.
[0205] Subsequently, with reference to the Fig. 3 to Fig. 7, the first housing coupling section 33 has a first contact section 33a which is coupled to the inner surface of the battery housing 20 and a first connecting section 33b which connects the support section 31 to the first contact section 33a.
[0206] The first contact section 33a is coupled to the inner surface of the battery housing 20. If the battery housing 20 has the corrugated section 21, the first contact section 33a can be coupled to the corrugated section 21 as described above. In this case, as described above, for a stable contact and coupling, both the corrugated section 21 and the first contact section 33a can extend in a direction approximately parallel to the lower surface of the battery housing 20, i.e., in a direction approximately perpendicular to the side wall of the battery housing 20. Additionally, although not shown in the drawings, the connected section between the first contact section 33a and the first connecting section 33b can fit the inner surface of the corrugated section 21.This means that the shape of the connected section between the first contact section 33a and the first connecting section 33b and the shape of the bead section 21 at the corresponding location can match each other. In this case, when the first housing coupling section 33 is coupled to the bead section 21, it is possible to increase the coupling strength between the first housing coupling section 33 and the bead section 21 and to increase the resistance reduction effect with increasing contact area. Meanwhile, the outermost point of the first connecting section 33b can be spaced a predetermined distance from the radially innermost point of the bead section 21.
[0207] The first connecting section 33b can have at least one first bending section B1, which changes at least once in the direction of expansion between the support section 31 and the first contact section 33a. The first connecting section 33b can, for example, have a spring-like or bellows-like structure capable of contracting and expanding within a predetermined range. The structure of the first connecting section 33b enables the first contact section 33a to come into close contact with the corrugated section 21 in the battery housing 20 during the process of receiving the electrode assembly 10, which has the current collector 30 coupled to it, even if the electrode assembly 10 has a certain degree of vertical deviation.
[0208] For example, the vertical distance D between the first contact section 33a and the support section 31 in the undeformed state, in the absence of an external force exerted on the current collector 30, is preferably substantially equal to the vertical distance between the upper surface of the beaded section 21 and the support section 31 when the electrode assembly 10, which includes the coupled current collector 30, is located in the battery housing 20, or, within the strain range of the first connection section 33b, smaller than the vertical distance. That is, the first housing-coupling section 33 can be elastically prestressed on the beaded section 21. In particular, the first housing-coupling section 33 can be coupled to the beaded section 21, the stored elastic energy causing a deformation to reduce the straight-line distance from one end of the first connection section 33b in the longitudinal direction to the other end.If the first connection section 33b is designed to meet this requirement, the first contact section 33a can automatically come into close contact with the beaded section 21 when the electrode assembly 10 with the current collector 30 coupled to it is located in the battery housing 20.
[0209] Furthermore, the contractile and expandable structure of the first connecting section 33b mitigates shocks caused by the movement of the electrode assembly 10 in a certain area when the electrode assembly 10 moves up and down due to vibrations and / or shocks, while the cylindrical battery 1 (see Fig. 1) is in use. That is, the contractible and expandable structure of the first connecting section 33b can serve as a buffer to prevent the transmission of shocks to the coupled section between the first contact section 33a and the battery housing 20 and the coupled section between the tab coupling section 32 and the first uncoated area 11 (see Fig. 1 to Fig. 5) to prevent.
[0210] Meanwhile, the first contact section 33a can be coupled to the upper surface of the bead section 21 (the upper surface of the upper bead section) by welding. Additionally, the first contact section 33a can be coupled to the flat area on the upper surface of the bead section 21 by welding. The weld area between the first contact section 33a and the bead section 21 can be narrower than the flat upper surface of the bead section 21. If the first bend section B1 is provided, the angle between the first contact section 33a and the first connection section 33b can be acute due to the first bend section B1.
[0211] Then, with reference to Fig. Figure 8 shows the current collector 30 according to a further embodiment of the present invention. The current collector 30 according to a further embodiment of the present invention differs only in the shape of the first contact section 33a from the current collector 30 described above (referring to Figure 8). Fig. 2 current collectors described for illustrative purposes), and the structure of the current collector 30 described above can be applied essentially the same way to the others.
[0212] With reference to the Fig. 1 and Fig. 8. At least part of the first contact section 33a can have the form of an arc extending circumferentially along the corrugated section 21 of the battery housing 20. In this case, to maximize the contact area, the current collector 30 can be configured such that the sum of the circumferentially extended lengths of the first contact sections 33a of the plurality of first housing coupling sections 33 can be less than or substantially equal to the inner circumference of the battery housing 20. Alternatively, the first contact section 33a can have the form of an arc extending in opposite directions along the circumferential direction of the corrugated section 21 from the intersection between the connecting section 33b and the contact section 33a.
[0213] Then, with reference to the Fig. 9 and Fig. 10 together with Fig. Figure 1 shows the current collectors 30 according to yet another embodiment of the present invention. In comparison to the current collectors 30 (referring to the Fig. 2 and Fig. The current collector 30 according to a further embodiment of the present invention differs from the current collector 30 described in Figure 8 (for illustrative purposes) only in that it further comprises a second housing coupling section 34, and the structure of the current collector 30 described above (see Figure 8) is the same. Fig. 9) can be applied essentially the same way to the others.
[0214] The second housing coupling section 34 extends from the end of the tab coupling section 32 and is coupled to the inner surface of the battery housing 20. The second housing coupling section 34 is provided at the end of at least one of the plurality of tab coupling sections 32. The second housing coupling section 34 comprises a second contact section 34a, which is coupled to the inner surface of the battery housing 20, and a second connecting section 34b, which connects the end of the tab coupling section 32 of the support section 31 to the second contact section 34a.
[0215] The second contact section 34a is coupled to the inner surface of the battery housing 20. If the battery housing 20 has the corrugated section 21 in the same way as the first contact section 33a described above, the second contact section 34a can be coupled to the corrugated section 21. In this case, as described above, for stable contact and coupling, the corrugated section 21 and the second contact section 34a can extend in a direction approximately parallel to the bottom surface of the battery housing 20, i.e., in a direction approximately perpendicular to the side wall of the battery housing 20.
[0216] Even if not shown in the drawings, it can be represented in the same way as the shape of the in Fig. In the case of the first contact section 33a shown in Figure 8, at least a portion of the second contact section 34a extends circumferentially along the corrugated section 21 of the battery housing 20. In this case, to maximize the contact area between the current collector 30 and the battery housing 20, the current collector 30 can be configured such that the length obtained by adding the sum of the circumferentially extended lengths of the first contact sections 33a of the plurality of first housing coupling sections 33 to the sum of the circumferentially extended lengths of the second contact sections 34a of the plurality of second housing coupling sections 34 is less than or substantially equal to the inner circumference of the battery housing 20.
[0217] In the same way as the first connection section 33b described above, the second connection section 34b can have at least one second bending section B2, which changes at least once in the direction of expansion between the tab coupling section 32 and the second contact section 34a. By forming the second bending section B2, the second connection section 34b has a compressible and expandable structure and therefore exhibits the assembly method advantage of the cylindrical battery 1 as well as the buffer effect described above.
[0218] Although the drawings of the present invention show only a second bending section B2, the present invention is not limited thereto and is designed in the same way as the one referred to in the Fig. 4 and Fig. 5. The first connection section 33b described for illustrative purposes can be provided with a plurality of second bending sections B2.
[0219] With reference to Fig. Figure 11 shows the pantograph 30 with a different shape than those described above. Referring to Fig. 11 together with Fig. 1. The current collector (the first current collector) 30 of the present invention can have at least one insertion opening H3. The insertion opening H3 can, for example, be provided in the lug coupling section 32. If several lug coupling sections 32 are provided, the insertion opening H3 can be provided in at least one of the lug coupling sections 32. The insertion opening H3 can, for example, be provided on one side or each of two sides of the at least one weld bead W formed on the lug coupling section 32. With reference to the Fig. 1 and Fig. 11 In the manufacture of the cylindrical battery 1 according to one embodiment of the present invention, the electrolyte solution can be injected into the battery housing 20 after the assembly comprising the electrode assembly 10 and the current collector (the first current collector) 30 has been inserted. In this case, the injection efficiency can be improved through the injection opening H3.
[0220] A tab coupling section 32 can have a plurality of insertion openings H3. The plurality of insertion openings H3 can be arranged approximately symmetrically on the left and right sides with respect to the center of the tab coupling section 32 in the width direction. The weld bead W for coupling between the tab coupling section 32 and the first uncoated area 11 can be formed between the insertion openings H3, which are arranged approximately symmetrically on the left and right sides.
[0221] The tab coupling section 32 can be configured such that its width at a predetermined distance from the coupling section to its end in the longitudinal direction is greater than the width of the coupling section between the tab coupling section 32 and the support section 31. At least part of the area in which the insertion opening H3 is formed can be contained in an extended region by a greater width at the predetermined distance from the coupling section to its end than the width of the coupling section between the tab coupling section 32 and the support section 31. Meanwhile, the end of the tab coupling section 32 can approximately have the shape of an arc in the longitudinal direction, corresponding to the inner circumferential surface of the battery housing 20.
[0222] With reference to the Fig. 12 and Fig. 13. The first connecting section 33b of the first housing coupling section 33 and / or the second connecting section 34b of the second housing coupling section 34 of the present invention can be bent once and can be bent in a direction other than that shown in the Fig. 3 and Fig. 10 shown be bent. That is, the first bent section B1, which is formed on the first connecting section 33b, and / or the second bent section B2, which is formed on the second connecting section 34b, can project in the direction towards the center of the cylindrical battery 1 (see Fig. 1) The bending direction of the first connecting section 33b and / or the second connecting section 34b is intended to prevent damage to the coupled section between the current collector (the first current collector) 30 and the electrode assembly 10 and / or the coupled section between the current collector (the first current collector) 30 and the battery housing 20 during the dimensioning process. The dimensioning process is a compression process to reduce the height occupied by the corrugated section 21 of the battery housing 20 in order to reduce the height of the cylindrical battery 1 during its manufacture.As a result of an experiment on how much the welded section is damaged after the dimensioning process depending on the presence or absence of the bending sections B1, B2 and the protrusion direction of the bending sections B1, B2, it is found that in the cylindrical battery 1 with a structure in which the bending sections B1, B2 protrude in the direction towards the center of the cylindrical battery 1, no damage occurs.
[0223] With reference to the Fig. 17 to Fig. Figure 20 shows some steps of the manufacturing process of the cylindrical battery 1 of the present invention. With reference to Fig. 17. The current collector 30 is first placed on the electrode assembly 10, which is housed in the battery casing 20, and the first uncoated area 11, which protrudes beyond the electrode assembly 10, and the current collector 30 are welded together. In this case, the lug coupling section 32 of the current collector 30 is attached to the lug surface 102 (see Figure 1). Fig. 15) welded where the several segments 11a (see Fig. 20) are bent, which are provided in the first uncoated area 11. In one variation, the current collector 30 can be pre-welded to the lug surface 102 before the electrode assembly 10 is received in the battery housing 20.
[0224] Subsequently, with reference to Fig. 18. When the current collector 30 is welded to the electrode assembly 10, a crimping tool is driven forward into the battery housing 20. Accordingly, the crimping section 21, pressed inwards by the battery housing 20, is formed on the side wall of the battery housing 20, and the crimping section 21 is positioned below the contact section 33a of the current collector 30. The contact section 33a and the crimping section 21 are then placed at a weldable location.
[0225] Subsequently, with reference to Fig. 19 together with Fig. 18. The contact section 33a of the current collector 30 is placed on the upper surface of the crimped section 21. With the current collector 30 positioned on the upper surface of the crimped section 21, the current collector 30 and the crimped section 21 can be welded together. The housing cover 40, the end of which is surrounded by the sealing element G1, can be placed on the upper surface of the contact section 33a. Subsequently, the battery housing 20 is bent around the edge of the housing cover 40 to secure the housing cover 40 and the current collector 30. The area located on top of the crimped section 21 of the battery housing 20 is bent to form the crimp section 22, and the widened and bent shape of the crimp section 22 secures the housing cover 40 and the contact section 33a of the current collector 30 to the crimped section 21.The housing coupling section 33 can be compressed and fixed by the crimp section 22.
[0226] Meanwhile, in the present invention, the direction of extension of the weld pattern formed between the first uncoated area 11 and the tab coupling section 32, and the direction of extension of the weld pattern formed between the bead section 21 and the first contact section 33a, can be approximately perpendicular to each other. For example, the direction of extension of the weld pattern formed between the first uncoated area 11 and the tab coupling section 32 can be the radial direction of the electrode assembly 10, and the direction of extension of the weld pattern formed between the bead section 21 and the first contact section 33a can be the circumferential direction of the electrode assembly 10 (or the battery housing 20). In this case, a tangent line formed at a point in the circumferential direction is perpendicular to the radial direction.This structure can increase the coupling strength between the current collector 30 and the electrode assembly 10, and the coupling strength between the current collector 30 and the battery housing 20. This means that, according to this structure, the current collector 30 can be held firmly fixed in any position by the electrode assembly 10 and the battery housing 20, even when vibrations and / or shock loads act on the cylindrical battery 1 in all directions.
[0227] Then, with reference to Fig. 20 together with Fig. Figure 19 shows the cylindrical battery with a height determined by the dimensioning process. The dimensioning process is a compression process to reduce the height occupied by the corrugated section 21 of the battery housing 20 during the manufacturing of the cylindrical battery. Since the battery housing 20 is compressed in the direction parallel to its height (parallel to the Z-axis) by the dimensioning process, the corrugated section 21 of the electrode assembly 10 is compressed such that its portion can be compressed. In another respect, the current collector 30 can bend when subjected to vertical pressure because the battery housing 20 is compressed in the longitudinal (vertical) direction by the dimensioning process.This means that when the dimensioning process is carried out, the lug coupling section 32 is bent upwards, causing damage to the weld between the lug coupling section 32 and the first uncoated area 11. Therefore, after the dimensioning process, the pantograph 30 11 should have a structure to prevent damage to the welded section between the lug coupling section 32 and the first uncoated area.
[0228] If, for example, the connecting section (the first connecting section) 33b has an upwardly convex shape, as in Fig. As shown in Figure 22, it is possible to maximize the suppression effect of a phenomenon where the tab coupling section 32 is raised upwards, as in Fig. 20 shown. That is, if the battery casing 20 of Fig. When the connecting section 33b is compressed vertically, it bends, and an upward stress acts on the tab coupling section 32 of the present invention. However, if the connecting section 33b has an approximately upwardly convex shape like the current collector 30 of the present invention, it is possible to minimize the stress exerted on the tab coupling section 32. Accordingly, the tab coupling section 32 is not bent upwards, and the welded section with the first uncoated area 11 can be maintained in a good welded condition.
[0229] In particular, with reference to Fig. 22 and Fig. 23. Before the dimensioning process, the connecting section 33b has an upwardly convex structure with respect to an imaginary straight line connecting the connection point between the contact section 33a and the connecting section 33b to the connection point between the connecting section 33b and the tab coupling section 32, i.e., an imaginary straight line connecting the two ends of the connecting section 33b longitudinally. For example, at least one bending section B1 forming an obtuse angle may be provided on the connecting section 33b. The bending section B1 may pass through the approximate midpoint of the imaginary straight line connecting the two ends of the connecting section 33b and may be located at a higher point than an imaginary plane parallel to the bottom surface of the battery housing 20.Preferably, the length of the connecting section 33b from the bending section B1 to the tab coupling section 32 can be longer than the length of the connecting section 33b from the bending section B1 to the contact section 33a.
[0230] According to this structure, during the dimensioning process, while vertical pressure is applied, the contact section 33a moves downwards in the direction of the arrow, and the connecting section 33b is raised upwards in the direction of the arrow (see the dashed line). Specifically, the connecting section 33b is raised higher than the bead section 21. That is, the profile of the housing coupling section 33 changes before and after the dimensioning process, as shown in the Fig. 22 and Fig. Figure 23 shows that the extent of the projection of the connecting section 33b can change depending on the height change of the battery housing 20, which is made during the dimensioning process. Meanwhile, in contrast to the drawing, the position of the bending section B1 can only move up to the height level of the contact section 33a. Due to the phenomenon where the connecting section 33b is raised upwards, it can absorb most of the stress, thus reducing the stress exerted on the weld surface of the tab coupling section 32 and the first uncoated area 11. Accordingly, according to the present invention, the phenomenon where the tab coupling section 32 is raised upwards does not occur.Furthermore, due to the structure described above, the length of the connecting section 33b from the bending section B1 to the tab coupling section 32 is longer than the length of the connecting section 33b from the bending section B1 to the contact section 33a, and thus it is easy to insert the current collector 30 into the battery housing 20, and it is possible to effectively dissipate the voltage.
[0231] Meanwhile, the shape change can be made by the projection of the connecting section 33b in the form of an approximately curved line that is convex upwards, as in Fig. 22 shown, or can be in the form of a curved straight line with respect to the bending section B1, as shown in Fig. 23 shown. If a bend occurs in the form of a straight line, as in Fig. As shown in Figure 23, each of the area from bending section B1 to contact section 33a and of the area from bending section B1 to tab coupling section 32 in connection section 33b can have the form of a straight line.
[0232] As a result of investigating the structure of the pantograph 30 to prevent phenomena in which the pantograph 30 is twisted and / or raised, the inventors have found that it is possible to significantly reduce damage occurring in the welded section between the lug coupling section 32 and the first uncoated area 11 during the dimensioning process if the connecting section 33b has an upwardly convex structure.
[0233] Fig. Figure 21 is a diagram illustrating a difference in the extent of damage depending on the shape of the pantograph 30 before the dimensioning process. With reference to Fig. In Experiment 21, Experimental Example 1 is an experimental example where the connecting section 33b has the shape of a straight line before dimensioning; Experimental Example 2 is an experimental example where the connecting section 33b is convex downwards before dimensioning; and Experimental Example 3 is an experimental example where the connecting section 33b is convex upwards before dimensioning. As a result of dimensioning by 1 mm in Experimental Examples 1 to 3, in Experimental Example 1, where the connecting section 33b has the shape of a straight line, the weld area with the tab coupling section 32 is raised by approximately 0.72 mm. In Experimental Example 2, where the connecting section 33b has a downward convex shape, the weld area with the tab coupling section is raised by approximately 0.99 mm.This means that the raised phenomenon is more pronounced than with the straight connecting section 33b when the connecting section 33b is convex downwards. Meanwhile, in experimental example 3, where the connecting section 33b has an upward convex shape, the weld area with the tab coupling section 32 is raised by approximately 0.02 mm. This indicates that the raised phenomenon is significantly reduced compared to experimental examples 1 and 2. Therefore, in experimental example 3, where the connecting section 33b has an upward convex shape, it can be seen that it is possible to minimize damage to the weld area between the tab coupling section and the first uncoated area. This is because the extent of the protrusion of the current collector 30 can change depending on the voltage exerted by the current collector 30 on the electrode assembly 10.That is, in experimental example 1, where the connecting section 33b has a straight shape, and in experimental example 2, where the connecting section 33b has a downwardly convex shape, a very large stress of approximately 4.5 MPa and 3.7 MPa is exerted on the welded section of the current collector 30 and the electrode assembly 10 respectively during the dimensioning process, and thus it can be seen that the protrusion phenomenon of the current collector 30 is stronger. In contrast, in experimental example 3, where the connecting section 33b has the upwardly convex shape, the stress exerted on the welded section of the current collector 30 and the electrode assembly 10 in the dimensioning process is at the level of approximately 2.0 MPa, which is lower than in experimental examples 1 and 2, and thus it can be seen that the raised phenomenon of the current collector 30 is reduced.
[0234] Accordingly, it is preferable, as in Fig. As shown in Figure 22, the inclination of the connecting section 33b is not uniform, and the inclination may be smaller in the upper region than in the lower region with respect to a predetermined location (for example, the bending section B1). The predetermined location may be situated higher than the center of the connecting section 33b. Alternatively, the connecting section 33b may have an upward convex shape with respect to an imaginary straight line connecting the tab coupling section 32 to the contact section 33a. The convex shape may be a form of connected straight lines, a curved shape, or a combined form. In one example, as shown in Figure 22, the inclination of the connecting section 33b may be... Fig. 22 or Fig. As shown in Figure 23, the connecting section 33b has at least one bent section B1 with respect to the predetermined location. Preferably, the at least one bent section B1 can be bent at an obtuse angle so as not to overlap when viewed along the longitudinal axis of the battery housing 20. Meanwhile, the transition between the contact section 33a and the connecting section 33b can also be bent at an obtuse angle. Accordingly, the inclination of the connecting section 33b can decrease stepwise or gradually as the connecting section 33b moves towards the corrugated section 21.
[0235] According to a further aspect of the present invention, with reference to Fig. 20 The angle θ between the tab coupling section 32 and the connection section 33b can be, for example, 0 to 90°. If, for example, the upper end of the electrode assembly 10 is raised during the dimensioning process to the height corresponding to the bead section 21, the tab coupling section 32 and the contact section 33a can be arranged at the same height. In this case, the angle θ between the tab coupling section 32 and the connection section 33b is approximately 0°. Even during the dimensioning process, it is undesirable for the contact section 33a to be arranged in a lower position than the tab coupling section 32. In such a case, the first uncoated area 11 could be pressed too hard by the bead section 21, which would lead to damage.Accordingly, the angle θ between the tab coupling section 32 and the connecting section 33b is preferably equal to or greater than 0°. In another respect, the angle θ between the tab coupling section 32 and the connecting section 33b can increase to approximately 90° with stepwise or gradual changes in the length, thickness, or inclination of the connecting section 33b. However, to avoid contact with the housing cover 40, the angle θ preferably does not exceed 90°.
[0236] In another aspect of the present invention, the connecting section 33b can support the housing cover 40. For example, the connecting section 33b can be bent upwards during the dimensioning process. In this case, the upwardly bent connecting section 33b can contact the housing cover 40. Thus, the current collector 30 can be firmly fixed in the vertical direction during the dimensioning process. Accordingly, it is possible to prevent the electrode arrangement 10 from moving unnecessarily up and down in the battery housing 20 when vibrations and / or shock loads occur during the use of the cylindrical battery 1.
[0237] In another aspect of the present invention, the upper surface of the corrugated section 21 and the lower surface of the corrugated section 21 can be asymmetrical with respect to an imaginary reference plane passing through the innermost radial point of the corrugated section 21 parallel to the bottom surface of the battery housing. For example, with reference to Fig. 20, if the battery casing 20 is vertically compressed during the dimensioning process, the bead section 21 is also vertically compressed. In this case, the upper surface of the bead section 21 and the lower surface of the bead section 21 may be asymmetrical with respect to an imaginary reference plane (see the dashed line) passing through the innermost radial point of the bead section 21.
[0238] In another aspect of the present invention, the insertion depth of the corrugated section 21 can be defined as PD. For example, with reference to Fig. 24 The vertical distance from the inner surface of the battery housing 20 to the innermost radial point of the corrugated section 21 can be defined as the insertion depth PD. Meanwhile, the shortest distance from the end of the contact section 33a to a vertical line passing through the innermost radial point of the corrugated section 21 can be defined as an overlap length OV. That is, with reference to Fig. 24 The overlap length OV refers to the radial length of the overlap area of the corrugated section 21 and the current collector 30 when the corrugated section 21 is viewed from above. In this case, the cylindrical battery 1 of the present invention can satisfy the following relational equation. (R1,min+Wbead,min) / PDmax≤OV / PD≤(PDmax−R2,min) / PDmax
[0239] In order to weld the contact section 33a of the current collector 30 to the bead section 21, the ratio is preferably equal to or greater than (R1, min + W bead,min ) / PD max With reference to Fig. For welding the contact section 33a of the current collector 30 to the corrugated section 21, a greater overlap area than the radius of curvature R1 of the corrugated section 21 is required. If, for example, the contact section 33a overlaps by the same amount as the radius of curvature R1 of the corrugated section 21, there is no flat area, so the contact section 33a can only contact the corrugated section 21 at one contact point. That is, the contact section 33a cannot be stably positioned on the corrugated section 21. Accordingly, the contact section 33a requires an additional overlap area beyond the radius of curvature R1 of the corrugated section 21, and in this case, the length of the additional overlap area is preferably at least equal to or greater than the weld bead width W. beadThis means that the contact section 33a substantially overlaps the bead section 21 at the additional overlap area, and welding can be carried out in this area. Accordingly, the length of the additional overlap area is at least equal to or greater than the weld bead width W. bead for a stable weld without deviating from the overlap area. That is, the minimum overlap length for weldable placement of the contact section 33a on the bead section 21 is R1. min + W bead,min .
[0240] In another aspect, the ratio is preferably less than or equal to (PD). max - R2, min ) / PD max , to weld the contact section 33a of the pantograph 30 to the bead section 21. With reference to Fig. 24 The radius of curvature R2 exists at the boundary between the corrugated section 21 and the inner surface of the battery housing 20. Accordingly, the contact section 33a does not come into close contact with the corrugated section 21 and is raised by the radius of curvature R2 when the contact section 33a of the current collector 30 moves into the boundary between the corrugated section 21 with the radius of curvature R2 and the inner surface of the battery housing 20. Accordingly, the maximum overlap length for placing the contact section 33a in close contact with the corrugated section 21 is PD. max - R2, min .
[0241] In one example, the maximum value PD can be max The insertion depth PD of the corrugation section 21 should be approximately 10 mm, the minimum value of both R1, min as well as R2, min can be approximately 0.05 mm and W bead,mincan be approximately 0.1 mm. In this case, the ratio of the overlap length OV to the insertion depth PD of the bead section 21 can be in the range of approximately 1.5 to 99.5%. To weld the contact section 33a of the current collector 30 to the bead section 21, the ratio is preferably equal to or greater than approximately 1.5%. The lower limit of OV / PD can be determined from the maximum value PD. max the insertion depth of the corrugation section 21, the minimum value R1, min of the radius of curvature R1 and the minimum width of the contact section 33a, which requires contact with the upper surface of the beaded section 21 for welding the contact section 33a, i.e. the length of the minimum width W bead,min of the weld bead BD, can be determined. In particular, the maximum value PD can be determined in an example. maxthe insertion depth is 10 mm, the minimum contact width of the contact section 33a required for welding the contact section 33a, i.e. the length of the minimum width W bead,min The weld bead BD can be 0.1 mm and the minimum value R1, min The radius of curvature R1 can be 0.05 mm. In this state, the minimum value of the overlap length OV is 0.15 mm (= 0.1 mm + 0.05 mm) and PD maxThe overlap length (OV) is 10 mm, and thus the lower limit of OV / PD is 1.5%. Meanwhile, a point where the contact section 33a of the current collector 30 can contact the flat section of the upper surface of the corrugated section 21 up to its maximum width is a point where the radius of curvature R2 is located away from the inner surface of the battery housing. Accordingly, when the end of the contact section 33a is positioned at the appropriate point, the overlap length OV is at its maximum. The upper limit of OV / PD can be determined from the maximum value of the insertion depth and the minimum value of R2. min The radius of curvature R2 can be determined. In particular, the maximum value of the press-in depth can be 10 mm and the minimum value of the radius of curvature R2 can be 0.05 mm. In this state, the maximum value of the overlap length OV is 9.95 mm (= 10 mm - 0.05 mm) and PD max The value is 10 mm, and therefore the upper limit of OV / PD is 99.5%.
[0242] In another aspect of the present invention, the welding position at which the bead section 21 and the contact section 33a are welded can be defined as W. In particular, the welding position W can refer to the distance from the radially innermost point of the bead section 21 to the center point of the weld bead BD, which is located at the radially outermost point. In this case, the welding position W and the insertion depth PD can satisfy the following relationship equation. (OVmin−0.5*Wbead,min) / PDmax≤W / PD≤(OVmax−0.5*Wbead,min) / PDmax
[0243] The welding position W of the bead section 21 and the contact section 33a can be determined from the overlap length of the contact section 33a and the bead section 21 and the minimum width W. bead,min The weld bead BD can be determined.
[0244] With reference to Fig. 24. The welding position can be defined as W1 if the contact section 33a is placed on the bead section 21 to the minimum extent. The overlap length is then OV as described above. min Meanwhile, when the weld bead BD is formed in the overlap area, a stable weld is achieved, and therefore the weld bead BD must be completely contained within the overlap area. Accordingly, the weld area W1 must be at least 0.5 * W bead,min from OV min away in the direction of the inside of the corrugation section 21. Accordingly, W1 can satisfy the following relation equation. W1=OVmin−0.5*Wbead,min=R1,min+Wbead,min−0.5*Wbead,min=R1,min+0.5*Wbead,min
[0245] Meanwhile, for the minimum W1 / PD, PD should be at its maximum, and thus the minimum value of W / PD (OV) min -0.5* W bead,min ) / PD max .
[0246] In another aspect, which refers to Fig. As described in section 24, the welding position when the contact section 33a moves into the bead section 21 to its maximum extent can be defined as W2. The overlap length at this point is OV, as described above. max Meanwhile, if the weld bead BD is formed in the overlap area, a stable weld is achieved, and therefore the weld bead BD must be positioned entirely within the overlap area. Consequently, the weld point W2 must be at least 0.5 * W bead,min from OV max away towards the inside of the corrugation section 21. Accordingly, W2 can satisfy the following relation equation. W2=OVmax−0.5*Wbead,min=PDmax−R2,min−0.5*Wbead,min
[0247] Meanwhile, for the maximum W2 / PD, the result of the division of (PD) should be max - R2, min -0.5* W bead,min ) by PD, i.e. {1-(R2, min+0.5* W bead,min ) / PD}, be at its maximum. That is, when the PD value is at its maximum, the W2 / PD value is at its maximum. Accordingly, the maximum value of W / PD (OV min -0.5* W bead,min ) / PD max .
[0248] In one example, the minimum width required to weld contact section 33a to bead section 21 can be 0.1 mm. That is, the width of 0.1 mm corresponds to the minimum width of the weld bead BD that can be formed by laser welding. Accordingly, the welding position W1, when contact section 33a contacts the upper surface of bead section 21 with the minimum width, corresponds to a point (R1, min +0.5*0.1 mm) away from the innermost radial point of the bead section 21. Here R1 is, minThe minimum value of the radius of curvature R1 is, for example, 0.05 mm. When the laser is directed at the corresponding point, a weld bead BD with a width of 0.1 mm is formed on the contact surface between contact section 33a and bead section 21. The width of the weld bead BD corresponds to the minimum contact width of contact section 33a. The weld position W1, with respect to the insertion depth PD of bead section 21, is located 0.1 mm away from the innermost radial point of bead section 21.
[0249] Meanwhile, when the contact section 33a contacts the upper surface of the bead section 21 up to its maximum width, the end of the contact section 33a is at a point along the radius of curvature (R2, min ) positioned away from the inner surface of the battery casing. Here is R2, minThe minimum value of the radius of curvature R2 is, for example, 0.05 mm. In this case, the welding position W2 closest to the end of contact section 33a is a point 0.05 mm away from the end of contact section 33a. When the corresponding point is irradiated with a laser, the weld bead with a minimum width of 0.1 mm can be formed in contact with the end of contact section 33a. The welding position W2, when contact section 33a contacts the upper surface of bead section 21 up to its maximum width, is a point (PD- R2, min -0.05 mm) away from the radial innermost point of the bead section 21. In an example, if R2, min Since the maximum value of the welding position W2 is 0.05 mm, it is located one point PD-0.1 mm away from the radially innermost point of the bead section 21.
[0250] According to the above description, the welding position W of the contact section 33a can be set to the range from (0.1 mm) to (PD-0.1 mm) with respect to the radially innermost point of the bead section 21, in relation to the insertion depth PD, if R1, min and R2 min The weld area is 0.05 mm. Since the ratio of weld position W1 to the insertion depth PD is 0.05 mm when the insertion depth PD is at its maximum, the minimum value (%) of W1 / PD is 1% (= 100 * 0.1 mm / 10 mm). Furthermore, since the maximum value of the ratio W1 / PD of weld position W2 to the insertion depth PD is 0.05 mm when the insertion depth PD is at its maximum, the maximum value (%) of W2 / PD is 99% (= 100 * (10 mm - 0.1 mm) / 10 mm). In summary, the weld area can be 1% or more and 99% or less of the insertion depth PD.
[0251] Meanwhile, with reference to Fig. 24 The distance from the center point of the weld bead BD, which is arranged at the radially outermost point in the radial direction, to the radially innermost point of the bead section 21, when the overlap length OV is defined as W. In this case, the cylindrical battery 1 of the present invention can satisfy the following relational equation. W=OV−0.5*Wbead,min
[0252] In another aspect, the corrugated section 21 can have the flat area F, which is at least partially parallel to the bottom surface of the battery housing 20, and the length of the flat area F of the corrugated section 21, which contacts the current collector 30, can be OV - R1. That is, with reference to Fig. 23 corresponds to the flat area F of the length obtained by subtracting the radius of curvature R1 of the corrugated section 21 from the overlap length OV.
[0253] In yet another aspect of the present invention, if the overlap length OV is, the radial extent of the weld pattern or a set of weld beads BD formed between the bead section 21 and the contact section 33a can be W bead,min or more and OV - R1 or less.
[0254] With reference to Fig. 24 is the minimum width of the weld bead BD W bead,min , and thus the minimum value of the radial extent of the weld pattern formed between the bead section 21 and the contact section 33a is at least W bead,min Meanwhile, a plurality of weld beads BD can be formed over the entire flat area F of the bead section 21. In this case, the plurality of weld beads BD can form a uniform weld pattern. With reference to Fig. 23 The maximum value of the radial extent of the weld pattern formed between the bead section 21 and the contact section 33a can satisfy the following relation equation.
[0255] Maximum value of the radial length in the width direction of the weld pattern formed between the bead section 21 and the contact section 33a =W−W1+minimum width of weld bead BD=[(OV−0.5*Wbead,min)−(R1+0.5*Wbead,min)]+Wbead,min=OV−R1
[0256] In another aspect of the present invention, the ratio of the radial length in the width direction of the weld pattern to the length of the flat area F can be in the range of approximately 10 to 40%. Preferably, the ratio can be approximately 20 to 30%. If the ratio is in the range described above, the weld strength can increase with increasing weld area. Accordingly, the cylindrical battery 1 according to the present invention can exhibit excellent impact resistance properties.
[0257] According to a further aspect of the present invention, the ratio of a non-contact area between the current collector 30 and the upper surface of the electrode assembly 10 to the area of a circle with the outer diameter of the electrode assembly 10 as its diameter can be defined as the open ratio of the current collector 30. The open ratio can be calculated by the following equation. Opening ratio (%) = 1 − (Contact area between the current collector and the upper surface of the electrode assembly) / (Area of the circle with the outer diameter of the electrode assembly as its diameter) = (Non-contact area between the current collector and the upper surface of the electrode assembly) / (Area of the circle with the outer diameter of the electrode assembly as its diameter)
[0258] The opening ratio of the pantograph 30 can, for example, be approximately 30% or more and less than 100%, and preferably approximately 60% or more and less than 100%. When it is described that the in Fig. Figure 8a shows the current collector 30 placed on and coupled to the electrode assembly 10 for illustrative purposes. The contact area between the current collector 30 and the electrode assembly 10 can be the support section 31 and the tab coupling section 32. In other words, the ratio of the contact area between the current collector 30 and the electrode assembly 10 to the area of the circle with the outer diameter of the electrode assembly 10 as its diameter can be approximately 70% or less, and preferably approximately 40% or less. If the opening ratio of the current collector 30 is in the range described above, the electrolyte solution can smoothly penetrate the electrode assembly 10 through the open area of the current collector 30, including the current collector opening H2, when the electrolyte solution is injected.This means that if the opening ratio of the current collector 30 is in the range described above, the electrolyte solution penetrates the electrode assembly 10 through the winding center opening H1 provided in the electrode assembly 10 and the opening area of the current collector 30, in particular where there is a small gap between the overlapping surfaces of the segments 11a and between the adjacent segments 11a, and thus the electrolyte solution can smoothly penetrate the electrode assembly 10 by means of capillary action through the corresponding gap.
[0259] With reference to the Fig. 13 and Fig. 14. The distance A from the center of the current collector 30 to the end of the lug coupling section 32 can be less than or substantially equal to the distance B from the center of the winding opening H1 of the electrode assembly 10 to the innermost side of the bead section 21 formed in the battery housing 20. In this case, it is possible to prevent interference between the bead section 21 and the current collector 30 in the dimensioning process described above, thereby preventing damage to the current collector and / or the electrode assembly 10 caused by pressing the bead section 21 onto the current collector 30.
[0260] At least one weld bead W can be provided for each lug coupling section 32. In addition to the lug coupling section 32, the weld bead W can also be formed in the support section 31 of the pantograph 30.
[0261] The flat section can be provided at the bead section 21 as described above. At least one weld bead W is formed between the bead section 21 and the first contact section 33a. The at least one weld bead W can form a straight weld pattern extending along the approximate circumferential direction of the bead section 21. Alternatively, at least one weld bead W formed between the bead section 21 and the first contact section 33a can form an arc-shaped weld pattern extending approximately along the circumferential direction of the bead section 21. The weld bead W formed at the first contact section 33a can extend along the circumferential direction. According to another aspect, the weld pattern can have the form of a line created by connecting weld spots.According to another aspect, several weld beads formed between the bead section 21 and the first contact section 33a can be formed within the same contact section 33a.
[0262] Meanwhile, when the plurality of first housing coupling sections 33 is provided, the first contact sections 33a provided in the plurality of first housing coupling sections 33 can be connected to each other and formed in one piece, even if this is not shown in the figures.
[0263] With reference to Fig. 1. The housing cover 40 covers the opening section formed on one side of the battery housing 20. The housing cover 40 can be secured by the crimp section 22 formed on the top of the battery housing 20. In this case, for improved fastening strength and improved sealing of the battery housing 20, the sealing element G1 can be arranged between the battery housing 20 and the housing cover 40, and between the current collector 30 and the housing cover 40. In this case, the first contact section 33a and / or the second contact section 34a can be arranged between the beaded section 21 of the battery housing 20 and the sealing element G1. The first contact section 33a and / or the second contact section 34a, which are arranged between the beaded section 21 and the sealing element G1, can be secured by the bend in the crimp section 22, which extends upward from the beaded section 21.
[0264] In the present invention, the housing cover 40 is not a component that serves as a current passage. As long as the battery housing 20 and the housing cover 40 are firmly fixed by welding or by attaching another component, and the opening section of the battery housing 20 is airtight, the use of the sealing element G1 is therefore not essential.
[0265] When the sealing element G1 is applied, the extended length of a region located between the current collector 30 and the housing cover 40 within the sealing element G1 can be shorter than the extended length of a region located between the battery housing 20 and the housing cover 40. That is, the sealing element G1 surrounds the housing cover 40, and the radial length of the region covering the bottom side surface of the housing cover 40 can be shorter than the radial length of the region covering the top surface of the housing cover 40.If the sealing element G1 were extended too far towards the center of the cylindrical battery 1 within the battery housing 20, the current collector 30 could be deformed due to interference between the sealing element G1 and the current collector 30. This could result in a force being exerted on the welded section between the current collector 30 and the battery housing 20 and / or the welded section between the current collector 30 and the first uncoated area 11, potentially causing structural defects such as cracks. Therefore, these defects can be prevented by adjusting the extended length of the sealing element G1 as described above.
[0266] With reference to the Fig. 1 and Fig. 14. The sealing element G1 can have a greater thickness in the non-contact area with the first contact section 33a than in the contact area with the first contact section 33a. The sealing element G1 can have a greater compression ratio in the contact area with the first contact section 33a than in the non-contact area with the first contact section 33a. Since the sealing element G1 has both the area with the first contact section 33a and the area without the first contact section 33a, the thickness can change for each area along the circumferential direction at the bead section 21. Where the sealing element G1 has both the area with the first contact section 33a and the area without the first contact section 33a, the thickness can alternately increase and decrease several times along the circumferential direction at the bead section 21.Where the sealing element G1 has both the area with the first contact section 33a and the area without the first contact section 33a, the compression ratio can change for each area along the circumferential direction at the bead section 21. Since there is a difference in the degree of compression of the sealing element G1 at the area where the first contact section 33a is located and the area where the first contact section 33a is not located, there is a difference in thickness. Conversely, if the thickness differs for each location of the sealing element G1, the compression ratio at the contact area between the sealing element G1 and the first contact section 33a can be essentially the same as the compression ratio at the non-contact area. For example, the thickness of the sealing element G1 can increase in the non-contact area with the first contact section 33a.In this case, it is possible to prevent a phenomenon in which the compression ratio of the sealing element G1 in the area without the first contact section 33a is lower than that of the surrounding area, and to avoid the deterioration of the sealing performance in the corresponding area.
[0267] Meanwhile, the housing cover 40 can have a vent section 41 to prevent an increase in internal pressure caused by gas generated in the battery housing 20. The vent section 41 corresponds to an area formed in a portion of the housing cover 40 that is structurally more susceptible than the other areas to blowing out when internal pressure is applied. The vent section 41 can, for example, be an area with a smaller thickness than the other areas.
[0268] Terminal 50 is electrically connected through the battery housing 20 on the side opposite the opening section of the battery housing 20 to the second uncoated area 12 of the electrode assembly 10. Terminal 50 can pass approximately through the center of the bottom of the battery housing 20. For example, terminal 50 can be coupled to the current collector (second current collector) 60, which is coupled to the second uncoated area 12, or to the conductor tab (not shown), which is coupled to the second uncoated area 12, and can be electrically connected to the electrode assembly 10. Accordingly, terminal 50 has the same polarity as the second electrode of the electrode assembly 10 and can act as a second electrode terminal T2. If the second uncoated area 12 is a positive electrode tab, terminal 50 can serve as a positive electrode terminal.
[0269] Taking into account the polarity and function of terminal 50, terminal 50 must be kept insulated from the battery housing 20 with the opposite polarity. For this purpose, the insulating element G2 can be used between terminal 50 and the battery housing 20. Alternatively, insulation can be achieved by coating part of the surface of terminal 50 with an insulating material.
[0270] For the same reason, the second uncoated area 12 and / or the current collector (second current collector) 60 must be kept insulated from the battery housing 20. For this purpose, the insulator 70 can be arranged between the second uncoated area 12 and the battery housing 20 and / or between the current collector (second current collector) 60 and the battery housing 20. If the insulator 70 is used, the terminal 50 for the electrical connection with the second uncoated area 12 can pass through the insulator 70.
[0271] Meanwhile, in the present invention, an outer surface 20a of the closed section, which is arranged opposite the opening section provided on the top of the battery housing 20, can serve as a first electrode terminal T1. If the first uncoated area 11 is a negative electrode tab, the first electrode terminal T1 can be a negative electrode terminal.The cylindrical battery 1 according to the present invention has a structure in which the terminal 50, which is exposed on the underside opposite the opening section of the battery housing 20, can be used as the second electrode terminal T2, and the remaining area, with the exception of the area occupied by the terminal 50 on the underside of the battery housing 20 (including the exposed area of the insulating element G2 if the insulating element G2 is exposed to the outside of the terminal 50 on the outer surface 20a of the closed section), can be used as the first electrode terminal T1. Accordingly, the cylindrical battery 1 according to the present invention can connect both the positive and negative electrodes in one direction when multiple cylindrical batteries 1 are electrically connected, thus simplifying the electrical connection structure.Since the cylindrical battery 1 according to the present invention also has a structure in which the largest part of the underside opposite the opening section of the battery housing 20 can be used as an electrode connection, it is possible to have a sufficient area for welding the component for electrical connection.
[0272] With reference to Fig. 14 together with Fig. In the cylindrical battery 1 of the present invention, the current collector (the first current collector) 30 is designed to be coupled to the first uncoated area 11 and the inner surface of the battery housing 20. The current collector 30 can have a first section that contacts the inner surface of the battery housing 20 and a second section that is coupled to the first uncoated area 11. In this case, if the central area of the first section (referring to the approximate center of the first section along the circumferential direction of the electrode assembly 10) is projected onto the plane in which the second section is located, the central area of the first section and the second section can be spaced apart from each other along the circumferential direction of the electrode assembly 10.
[0273] The sealing element G1 can be arranged between the opening section of the battery housing 20 and the current collector 30, and in this case, the first section can be arranged between the inner surface of the battery housing 20 and the sealing element G1. Preferably, the first section can be arranged between the corrugated section 21 of the battery housing 20 and the sealing element G1.
[0274] Meanwhile, the first section and the second section can be arranged in different planes along the winding axis of the electrode assembly 10. That is, the first section and the second section can be spaced apart from each other along the direction parallel to the height (parallel to the Z-axis) of the cylindrical battery 1.
[0275] With reference to Fig. 25 together with Fig. 1. The current collector (the second current collector) 60 is coupled to the underside of the electrode assembly 10. The current collector 60 is made of a metal with conductive properties and is electrically coupled to the second uncoated area 12. The current collector 60 can be attached to the coupling surface (the lug surface) 102 (see Fig. 15) be coupled, which is formed by bending the end of the second uncoated area 12 in the direction parallel to the current collector 60. The bending direction of the second uncoated area 12 can be the radial direction and, for example, the direction towards the core of the electrode assembly 10. If the second uncoated area 12 has the bent shape described above, the space occupied by the second uncoated area 12 in the vertical direction is reduced, thereby improving the energy density. If the current collector 60 is additionally coupled to the coupling surface 102 formed by the bending of the second uncoated area 12, the increased coupling area can lead to improved coupling strength and reduced contact resistance. This is the same case as with the first uncoated area 11 described above.
[0276] The current collector (the second current collector) 60 has a lug coupling section (a second lug coupling section) 62 and a connection coupling section 63. The current collector 60 may further have an edge section 61. The edge section 61 is arranged below the electrode assembly 10 and has an approximately ring-shaped form with an empty space S inside. Although the drawings of the present invention show the edge section 61 with an approximately circular ring shape, the present invention is not limited thereto. The edge section 61 may, in contrast to those shown in the drawings, have an approximately square ring shape, a hexagonal ring shape, an octagonal ring shape, or any other ring shape.
[0277] The tab coupling section 62 can extend inwards from the edge section 61 and is coupled to the second uncoated area 12. As described above, the coupling between the current collector 60 and the second uncoated area 12 preferably has at least approximately 50% overlap with the zone with a uniform stacking number, where the number of overlapping layers of the segments is approximately at its maximum and is maintained approximately uniformly. That is, the tab coupling section 62 of the current collector 60 can be coupled to the second uncoated area 12 with at least approximately 50% overlap with the zone with a uniform stacking number.
[0278] The connection coupling section 63 is spaced apart from the lug coupling section 62. The connection coupling section 63 can be located within the edge section 61. The connection coupling section 63 can be coupled to the connection 50 by welding as described below. To provide a weld area for coupling to the flat section formed on the lower surface of the connection 50, the connection coupling section 63 can have a diameter that is substantially equal to or larger than the diameter of the flat section formed on the lower surface of the connection 50. For example, the connection coupling section 63 can be located approximately in the center of the interior space surrounded by the edge section 61.
[0279] The connection coupling section 63 can be positioned at the location corresponding to the winding opening H1 formed in the core of the electrode assembly 10. The connection coupling section 63 can be configured to cover the winding opening H1 of the electrode assembly 10 to prevent its exposure. When the winding opening H1 of the electrode assembly 10 is covered as described above, damage to the separator located in the opening due to the flow rate of the electrolyte solution passing through the opening and the resulting exposure of the electrode can be prevented. For this purpose, the connection coupling section 63 can have a larger diameter or width than the winding opening H1, as described above.However, the present invention does not exclude the case in which the diameter of the connection coupling section 63 is smaller than the diameter of the flat section formed on the bottom surface of the connection 50.
[0280] The lug coupling section 62 and the terminal coupling section 63 are not directly connected to each other; they are spaced apart and electrically connected by the edge section 61. Since the current collector 60 of the present invention has a structure in which the lug coupling section 62 and the terminal coupling section 63 are not directly connected to each other and are indirectly connected by the edge section 61, it is possible to distribute shocks exerted on the coupled section between the lug coupling section 62 and the second uncoated area 12 and on the coupled section between the terminal coupling section 63 and the terminal 50 when shocks and / or vibrations act on the cylindrical battery 1. Accordingly, the current collector 60 of the present invention can minimize or prevent damage to the welded section caused by shock loads.In particular, the current collector 60 of the present invention can have a structure in which the stress is concentrated on the connected section of the edge section 61 and the connection-coupling section 63 when shock loads are transmitted through the connection 50 to the interior of the battery 1. However, the connected section is not an area where the welded section is formed for coupling between components. Accordingly, the present invention makes it possible to effectively prevent product defects caused by damage to the welded section due to external shock loads.
[0281] The outer diameter of the second current collector 60 can be larger than the outer diameter of the first current collector 30. The outer diameter of the second current collector 60 is twice the distance from the center of the second current collector 60 to the end of the second lug coupling section 62 (the distance to the edge section 61 if the second current collector 60 has an edge section 61). The outer diameter of the first current collector 30 is twice the distance from the center of the first current collector 30 to the radially outermost point of the first lug coupling section 32. The outer diameter of the second current collector 60 can be close to the inner diameter of the battery housing 20. The outer diameter of the second current collector 60 can be in the range of approximately 33% to 98.5% of the inner diameter of the battery housing 20.The minimum value of the outer diameter of the second current collector 60 is a numerical value to prevent the resistance from increasing too much. The maximum value of the outer diameter of the second current collector 60 takes into account, for example, the tolerance of the outer diameter of the second current collector 60 that may occur during the manufacture of the current collector 60, the assembly tolerance that occurs when coupling the electrode assembly 10 and the second current collector 60, the tolerance of the inner diameter of the battery housing 20 that may occur during the manufacture of the battery housing 20, and the positional tolerance that may occur when inserting the assembly of the electrode assembly 10 and the second current collector 60 into the battery housing 20.When the insulator 70 is used in the present invention and covers the outer circumferential surface of the electrode assembly 10 up to its top surface, it is necessary to also consider a space for inserting the insulator 70. Therefore, the ratio of the outer diameter of the second current collector 60 to the inner diameter of the battery housing 20 is smaller than the maximum value. With regard to tolerance, the outer diameter of the second current collector 60 is limited to a slightly smaller level than the inner diameter of the battery housing 20, while the diameter of the first current collector 30 can be further limited to avoid interference that may occur during the dimensioning process. To avoid interference, the outer diameter of the first current collector 30 can be approximately equal to or smaller than the inner diameter in the area where the corrugated section 21 of the battery housing 20 is formed.
[0282] If the outer diameter of the first current collector 30 and / or the second current collector 60 is equal to T, the outer diameter of the electrode assembly 10 is equal to JR, and the height of the segment of the first uncoated area 11 and / or the outermost segment of the second uncoated area 12 is equal to F, the following relation equation can be satisfied. Here, the outer diameter of the first current collector 30 is twice the distance from the center of the first current collector 30 to the end of the first lug coupling section 32, and the outer diameter of the second current collector 60 is twice the distance from the center of the second current collector 60 to the end of the second lug coupling section 62 (or the radially outermost point of the edge section 61). JR−2*F≤TJR
[0283] Preferably, the outer diameter T of the first current collector 30 and / or the second current collector 60 can be greater than or equal to the length obtained by subtracting twice the height F of segment 11a of the first uncoated area 11 and / or the outermost segment of the second uncoated area 12 from the outer diameter JR of the electrode assembly 10. If this relationship is satisfied, the first tab coupling section 32 and / or the second tab coupling section 62 covers the end of the outermost segment 11a. That is, the first current collector 30 and / or the second current collector 60 can have an outer diameter sufficient to cover the end of the segment at the last winding turn of the first electrode.In this case, all segments 11a forming the lug surface 102, where the first lug coupling section 32 and / or the second lug coupling section 62 (or the edge section 61) is coupled, can be welded in a state where they are uniformly pressed by the pantograph 30, and after welding, the tightly stacked state of the segments 11a can be well maintained. The tightly stacked state essentially refers to no gap between the segments, as in . Fig. Figure 8 shows that the densely stacked state contributes to reducing the resistance of the cylindrical battery 1 below the suitable level (for example, 4 mΩ) for fast charging.
[0284] In another aspect, the outer diameter T of the first current collector 30 and / or the second current collector 60 can be smaller than the outer diameter JR of the electrode assembly 10. If the outer diameter T of the first current collector 30 and / or the second current collector 60 is larger than the outer diameter JR of the electrode assembly 10, the dead space in the battery housing 20 increases, which can negatively affect the energy density of the cylindrical battery 1. Accordingly, the outer diameter T of the first current collector 30 and / or the second current collector 60 is preferably smaller than the outer diameter JR of the electrode assembly 10.
[0285] Meanwhile, the extended length L2 of the welded section along the radial direction of the electrode assembly 10 when coupling the second lug coupling section 62 of the second current collector 60 and the second uncoated area 12 can be longer than the extended length L1 of the welded section along the radial direction of the electrode assembly 10 when coupling the first lug coupling section 32 of the first current collector 30 and the first uncoated area 11. For example, if the second current collector 60 is an aluminum positive electrode current collector and the first current collector 30 is a copper negative electrode current collector, then if length L2 is longer than length L1, the welded section of the positive electrode current collector with lower electrical conductivity is larger, resulting in a balanced current flow in each of the positive electrode current collectors and the negative electrode current collector.Here, the extended length of the welded section used for coupling between the pantographs 30, 60 and the uncoated areas 11, 12 refers to the extended length of the weld bead formed by welding.
[0286] Based on the core of the electrode assembly 10, the distance to the starting point of the welded section used for coupling between the first lug coupling section 32 of the first current collector 30 and the first uncoated area 11 can be substantially equal to the distance to the starting point of the welded section used for coupling between the second lug coupling section 62 of the second current collector 60 and the second uncoated area 12. Here, "substantially equal" can refer to two identical distances or to two distances with a deviation of, for example, approximately 5% or less.
[0287] The pantograph 60 may further comprise a bridge section 64 extending inwards from the edge section 61 and connected to the connecting coupling section 63. The bridge section 64 may have a tapered section 64a, which exhibits a continuous and / or stepwise reduction in width along a direction from the inner surface of the edge section 61 to the connecting coupling section 63. The tapered section 64a may exhibit a continuous and / or stepwise increase in width along a direction from the connected section between the connecting coupling section 63 and the edge section 61 towards the edge section 61. If the tapered section 64a is provided, it is possible to increase the stiffness of the component at the connected section between the bridge section 64 and the edge section 61.If the tapered section 64a is provided, it is possible to transfer the current collector 60 and / or the assembly consisting of the current collector 60 and the electrode assembly 10 easily and safely, for example by a transport device and / or an operator who holds the tapered section 64a during the manufacturing process of the cylindrical battery 1. That is, if the tapered section 64a is provided, it is possible to prevent product defects that can occur when a component is held that is to be welded to another component, such as the lug coupling section 62 or the terminal coupling section 63.
[0288] A plurality of lug coupling sections 42 and / or a plurality of bridge sections 44 can be provided. The number of lug coupling sections 42 and / or bridge sections 44 can be determined taking into account the resistance level required for the cylindrical battery 1 and the opening ratio required for the pantograph 60.
[0289] With reference to Fig. 1 and Fig. 26. Bridge section 64 can have a current-interrupting section N designed to partially reduce the cross-sectional area of bridge section 64. The reduction of the cross-sectional area of bridge section 64 in the area where the current-interrupting section N is formed can be achieved, for example, by partially reducing its width and / or thickness. If the current-interrupting section N is provided, and the increasing electrical resistance in the area where the current-interrupting section N is formed causes an overcurrent, the current-interrupting section N disintegrates, resulting in a rapid current interruption. A plurality of current-interrupting sections N can be provided along the longitudinal direction of bridge section 64.If a plurality of bridge sections 64 are provided, at least one of the plurality of bridge sections 64 can be provided with a current-break section. Although the illustrations of the present invention show the current-break section N in the form of a notch, the present invention is not limited thereto, and the current-break section N can, for example, be formed in the form of a groove and / or a through-hole. Although not shown in the drawings, a band surrounding the bridge section 64 can be applied to the area in which the current-break section N is formed. Applying the band makes it possible to prevent contaminants, such as molten metal, which are generated when the current-break section N breaks apart, from splashing onto other components and to avoid a short circuit.Furthermore, heat generated by the current interruption section N is not transferred to the outside, which allows the current interruption section N to decompose more quickly.
[0290] Meanwhile, to prevent contaminants generated during disassembly from entering the electrode assembly 10, the current-interruption section N is preferably provided in the area corresponding to the uniform stacking zone of the second uncoated area 12 described above. In this area, the number of overlapping layers of the segments of the second uncoated area 12 can be kept to a maximum, and the overlapping segments can act as a mask. The current-interruption section N can, for example, be formed approximately 40% to 90% away from the core of the electrode assembly 10 along the radial direction with respect to the radius of the electrode assembly 10. Preferably, the current-interruption section N can be located approximately midway between the core and the radially outermost point of the electrode assembly 10.
[0291] The structure of the electrode assembly 10 is described with reference to the Fig. 27 to Fig. 30 described in more detail. Among the first and second electrodes described above, the following description is based on the first electrode as an example, but the structure of the first electrode can be applied equally to the second electrode.
[0292] With reference to the Fig. 27 to Fig. 30 The first electrode 110 has the first electrode current collector 111 in a sheet shape, which is formed from a conductive foil, the first active material layer 112, which is formed on at least one surface of the first electrode current collector 111, and the first uncoated area 11, which is not coated with an active material at the end of the long side of the first electrode current collector 111.
[0293] Preferably, the first uncoated area 11 can have several notched segments 11a. The multiple segments 11a form several groups, and the height (length in the Z-axis direction) and / or the width (length in the X-axis direction) and / or the division of the segments 11a in each group can be substantially the same. The number of segments 11a in each group can be less or greater than those shown in the drawings. The segment 11a has a geometric shape consisting of a combination of at least one straight line and / or at least one curve. Preferably, the segment 11a can have a trapezoidal shape, and the shape can be modified, for example, to a rectangular, parallelogram-like, semicircular, or semi-elliptical shape.
[0294] Preferably, the height of segment 11a can gradually increase along a direction parallel to the winding direction of the electrode assembly 10, for example, from the core to the outer circumference. Additionally, a core-side uncoated region 11-1 adjacent to the core of the electrode assembly 10 can be free of segment 11a, and the height of the core-side uncoated region 11-1 can be lower than that of any other uncoated region. Similarly, an outer circumferential region 11-2 adjacent to the outer circumference of the electrode assembly 10 can be free of segment 11a, and the height of the outer circumferential region 11-2 can be lower than that of any other uncoated region.
[0295] Optionally, the first electrode 110 can have an insulating coating layer E covering the boundary between the active material layer 112 and the first uncoated region 11. The insulating coating layer E comprises a polymer resin with insulating properties and can optionally also include an inorganic filler. The insulating coating layer E can serve to prevent the end of the active material layer 112 from contacting the active material layer of the opposite polarity on the opposite side through the separator and to structurally support the bending of segment 11a. If the first electrode 110 is wound to form the electrode assembly 10, at least a portion of the insulating coating layer E is preferably exposed from the separator to the outside for this purpose.
[0296] With reference to the Fig. 27 and Fig. 28 the electrode assembly 10 can be by referring to Fig. The winding methods described in section 2 are used to produce the components. For the sake of simplicity, the structure of the uncoated regions 11 and 12 extending from the separator is shown in detail above, while representations of the winding structure of the first electrode, the second electrode, and the separator are omitted. The first uncoated region 11, which projects upwards, extends from the first electrode, and the second uncoated region 12, which projects downwards, extends from the second electrode.
[0297] The height profile of the uncoated areas 11, 12 is shown schematically. That is, the height of the uncoated areas 11, 12 can change irregularly depending on where the cross-section is taken. For example, if the side of the trapezoidal segment 11a is cut, the height of the uncoated area in the cross-section is lower than the height of segment 11a. Therefore, it can be understood that the height of the uncoated areas 11, 12 shown in the cross-sectional view of the electrode assembly 10 corresponds to an average height of the uncoated areas encompassed by each winding turn.
[0298] With reference to the Fig. 27 to Fig. 30 The uncoated areas 11, 12 can be bent along the radial direction of the electrode assembly 10, for example from the outer circumference to the core. In the uncoated areas 11, 12, in Fig. 28 An area where bending occurs is indicated by the dashed box. When the uncoated areas 11, 12 are bent, the adjacent segments overlap in the radial direction in several layers to form the bending surface 102 on the upper and lower parts of the electrode assembly 10. In this case, the core-side uncoated area 11-1 ( Fig. 27) due to its small height, it is not bent, and the height h of the segment 11a, which is bent on the innermost side, is approximately equal to or less than the sum of the radial length R of the winding area formed by the core-side uncoated area 11-1 without segment structure and 10% of the winding opening diameter. Thus, the opening formed on the core C of the electrode assembly 10 is not closed. Since the opening is not closed, it is possible to carry out the electrolyte introduction process smoothly, thereby improving the electrolyte introduction efficiency. In addition, it is possible to easily weld the terminal 50 and the second current collector 60 by inserting the welding tool through the opening (see Fig. 13).
[0299] Meanwhile, with reference to Fig. 31. The multiple cylindrical batteries 1 are connected in series and parallel using a busbar 150. The number of cylindrical secondary batteries 1 can be smaller or larger depending on the capacity of the battery pack.
[0300] In each cylindrical battery 1, for example, the terminal 50 can have the positive polarity and the outer surface 20a of the closed section of the battery housing 20 can have the negative polarity, and vice versa. The terminal 50 of the cylindrical battery 1 and the outer surface 20a of the closed section, which is located on the side opposite the open section of the battery housing 20, can be arranged upright (inversely to Fig. 1 reversed).
[0301] Preferably, the plurality of cylindrical batteries 1 can be arranged in a plurality of columns and rows. The column is a vertical direction with respect to the ground, and the row is a horizontal direction with respect to the ground. To maximize packing efficiency, the cylindrical batteries 1 can also be arranged in a densest packing structure. The nearest packing structure is formed by connecting the centers of the terminal exposure sections of the terminal 50, which are exposed to the outside of the battery housing 20, in the form of a right-angled triangle. Preferably, the busbar 150 can be arranged on the plurality of cylindrical batteries 1, more preferably between adjacent columns. Alternatively, the busbar 150 can be positioned between adjacent rows.
[0302] Preferably, the busbar 150 connects the cylindrical batteries 1 that are arranged in the same column in parallel and connects the cylindrical batteries 1 that are arranged in two adjacent columns in series.
[0303] Preferably the busbar 150 can have a body section 151, a plurality of first busbar connections 152 and a plurality of second busbar connections 153 for serial and parallel connection.
[0304] The body section 151 can extend between the terminals 50 of the adjacent cylindrical batteries 1 and preferably between the gaps of the cylindrical batteries 1. Alternatively, the body section 151 can extend along the gaps of the cylindrical batteries 1 and can be bent in a regular zigzag pattern.
[0305] The plurality of first busbar terminals 152 can project and extend from one side of the body section 151 towards the terminal 50 of each cylindrical battery 1 and can be electrically coupled to the terminal 50. The electrical coupling between the first busbar terminal 152 and the terminal 50 can be achieved by laser welding or ultrasonic welding. Furthermore, the plurality of second busbar terminals 153 can be electrically coupled from the other side of the body section 151 to the outer surface 20a of each cylindrical battery 1. The electrical coupling between the second busbar terminal 153 and the outer surface 20a can be achieved by laser welding or ultrasonic welding.
[0306] Preferably, the body section 151, the plurality of first busbar connections 152, and the plurality of second busbar connections 153 can consist of a single conductive metal plate. The metal plate can, for example, be an aluminum plate or a copper plate, but the present invention is not limited thereto. In a variation, the body section 151, the plurality of first busbar connections 152, and the plurality of second busbar connections 153 can be manufactured separately from single pieces and then coupled together, for example, by welding.
[0307] The cylindrical battery 1 according to the present invention has the terminal 50 with positive polarity and the outer surface 20a of the closed section of the battery housing 20 with negative polarity, which are aligned in the same direction, and thus it is easy to establish the electrical connection of the cylindrical batteries 1 using the busbar 150.
[0308] Furthermore, the terminal 50 of the cylindrical battery 1 and the outer surface 20a of the closed section of the battery housing 20 have a large area, thus making it possible to ensure a sufficient coupling area of the busbar 150, thereby sufficiently reducing the resistance of the battery pack with the cylindrical battery 1.
[0309] Preferably, the cylindrical battery can be, for example, a cylindrical battery with a form factor ratio (defined as the product of dividing the diameter of the cylindrical battery by the height or a ratio of height (H) to diameter (Φ)) of more than about 0.4.
[0310] Here, the form factor refers to a value that specifies the diameter and height of the cylindrical battery. The cylindrical battery according to one embodiment of the present invention can, for example, have the form factor 46110, 4875, 48110, 4880, and 4680. In the numbers that specify the form factor, the first two numbers indicate the diameter of the battery, and the remaining numbers indicate the height of the battery.
[0311] The cylindrical battery according to one embodiment of the present invention can be a cylindrical battery with an approximately cylindrical shape, with a diameter of approximately 46 mm, a height of approximately 110 mm and a form factor ratio of approximately 0.418.
[0312] The cylindrical battery according to another embodiment can be a cylindrical battery with a substantially cylindrical shape, with a diameter of approximately 48 mm, a height of approximately 75 mm and a form factor ratio of approximately 0.640.
[0313] The cylindrical battery according to yet another embodiment can be a cylindrical battery with an approximately cylindrical shape, with a diameter of approximately 48 mm, a height of approximately 110 mm and a form factor ratio of approximately 0.418.
[0314] The cylindrical battery according to another embodiment can be a cylindrical battery with an approximately cylindrical shape, with a diameter of approximately 48 mm, a height of approximately 80 mm and a form factor ratio of approximately 0.600.
[0315] The cylindrical battery according to yet another embodiment can be a cylindrical battery with an approximately cylindrical shape, with a diameter of approximately 46 mm, a height of approximately 80 mm and a form factor ratio of approximately 0.575.
[0316] Traditionally, batteries with a form factor ratio of approximately 0.4 or less were used. That is, for example, the 1865 battery and the 2170 battery were traditionally used. The 1865 battery has a diameter of approximately 18 mm, a height of approximately 65 mm, and a form factor ratio of approximately 0.277. The 2170 battery has a diameter of approximately 21 mm, a height of approximately 70 mm, and a form factor ratio of approximately 0.300.
[0317] With reference to Fig. 32 The battery pack 3 according to one embodiment of the present invention comprises a battery arrangement with a plurality of cylindrical batteries 1 according to one embodiment of the present invention, as described above, which are electrically connected to one another, and a pack housing 2 that accommodates them. For the sake of simplicity, the illustration of the component for electrical connection, such as the busbar, a cooling unit, and a power connection, has been omitted from the drawings of the present invention. The electrical connection structure of the plurality of batteries 1 for manufacturing the battery pack 3 is shown above for illustrative purposes with reference to Fig. 30 described.
[0318] With reference to Fig.33. A vehicle 5 according to one embodiment of the present invention can, for example, be an electric vehicle, a hybrid electric vehicle, or a plug-in hybrid vehicle and comprises the battery pack 3 according to one embodiment of the present invention. The vehicle 5 comprises a four-wheeled vehicle and a two-wheeled vehicle. The vehicle 5 operates using the power supplied by the battery pack 3 according to one embodiment of the present invention.
[0319] According to the present invention, it is possible to significantly reduce the resistance during the electrical connection of the electrode assembly to the battery housing. Furthermore, according to the present invention, it is possible to improve the coupling strength of the coupling section between the current collector and the battery housing. Finally, according to the present invention, it is possible to improve the energy density of the cylindrical battery. Finally, according to the present invention, it is possible to increase the practicality of the welding process for the electrical connection between the battery housing and the current collector during the manufacture of the cylindrical battery, thereby improving productivity.According to a further aspect, the present invention makes it possible to significantly reduce the probability of damage occurring to the welded section between the current collector and the electrode assembly and / or the welded section between the current collector and the battery housing when subjected to vibrations and shock loads during battery use. Furthermore, the present invention makes it possible to increase the practicality of the welding process for the electrical connection between the battery housing and the current collector during the manufacture of the cylindrical battery, thereby improving productivity.
[0320] While the present invention has been described above in relation to a limited number of embodiments and drawings, the present invention is not limited thereto, and it is obvious to the person skilled in the art that a variety of modifications and changes to it can be made within the technical aspects of the present invention and the attached claims and their equivalent scope.
[0321] In light of the foregoing, it is understood that the present invention also relates to the following embodiments listed: Item 1. Battery, comprising: an electrode assembly comprising a first electrode, a second electrode and a separator arranged between the first electrode and the second electrode, which is wound around a winding axis defining a core and an outer circumferential surface, wherein the first electrode has a first uncoated area which is not coated with an active material layer and is exposed to the outside of the separator at one end of a long side along a winding direction, and at least part of the first uncoated area itself is used as an electrode tab; a battery housing which has an opening section on one side to accommodate the electrode assembly through the opening section; comprising a first current collector, a support section arranged on the electrode assembly, a first tab coupling section extending from the support section and coupled to the first uncoated area, and a first housing coupling section extending from the support section and electrically coupled to an inner surface of the battery housing; and a housing cover that closes the opening section. Point 2. Battery according to point 1, wherein the first tab coupling section and the first housing coupling section are not directly connected to each other and are indirectly connected through the support section. Point 3. Battery according to one of the preceding points, wherein the battery housing has a corrugated section formed at an end adjacent to the opening section and driven inwards. Point 4. Battery according to one of the preceding points, wherein the first tab coupling section has at least one insertion opening. Point 5. Battery according to one of the preceding points, wherein the first housing coupling section has: a first contact section that is coupled to the corrugated section of the battery housing; and a first connecting section that connects the support section with the first contact section. Point 6. Battery according to one of the preceding points, wherein the first connecting section has an upwardly convex structure with respect to an imaginary straight line connecting two ends of the first connecting section in a longitudinal direction. Point 7. Battery according to one of the preceding points, wherein the first connecting section has a more upwardly raised structure than the corrugated section. Point 8. Battery according to one of the preceding points, wherein the corrugated section has: an upper corrugated section that is arranged on an upper part in relation to an innermost inner side when the battery casing is pressed in; and a lower bead section that is located on a lower part in relation to the innermost inside when the battery casing is pressed in. Point 9. Battery according to any of the preceding points, wherein the upper bead section and the lower bead section are asymmetrical with respect to an imaginary reference plane passing through the innermost inside of the bead section parallel to a bottom surface of the battery casing. Point 10. Battery according to one of the preceding points, wherein at least a first lug coupling section of the first current collector is arranged at a lower point than the lower corrugated section. Point 11. Battery according to one of the preceding points, wherein the upper corrugated section and / or the lower corrugated section is inclined at a predetermined angle to a lower surface of the battery housing. Point 12. Battery according to one of the preceding points, wherein the first contact section sits on an inclined upper surface of the beaded section. Point 13. Battery according to one of the preceding points, wherein the upper corrugation section and / or the lower corrugation section is at least partially parallel to a bottom surface of the battery housing. Point 14. Battery according to one of the preceding points, wherein the first contact section sits on a flat upper surface of the corrugated section. Point 15. Battery according to one of the preceding points, wherein the first contact section is coupled to an upper surface of the beaded section by welding. Point 16. Battery according to one of the preceding points, wherein the first contact section within a flat area formed on the upper corrugated section is coupled by welding. Point 17. Battery according to any of the preceding points, wherein at least part of the first contact section has the form of an arc extending in a circumferential direction along the corrugated section of the battery casing. Point 18. Battery according to any of the preceding points, wherein the first contact section has the form of an arc extending from an intersection between the first connecting section and the first contact section in opposite directions along a circumferential direction on the beaded section. Point 19. Battery according to one of the preceding points, wherein, if a press-in depth of the corrugated section PD is, a minimum value of a radius of curvature of the corrugated section R1, minis a minimum value of a weld bead width W bead,min is and a minimum value of a radius of curvature at a boundary area between the corrugated section and the inner surface of the battery housing R2, min is, PD≥R1,min+R2,min+Wbead,min is fulfilled. Point 20. Battery according to one of the preceding points, wherein the insertion depth of the corrugated section is 0.2 to 10 mm. Point 21. Battery according to one of the preceding points, wherein, if an insertion depth of the corrugated section PD is, a maximum value of the insertion depth PD max is an overlap length OV, where the overlap length is a shortest distance from an end of the first contact section to a vertical line passing through an innermost point of the bead section, a minimum value of a radius of curvature of the bead section R1, min is a minimum value of a weld bead width W bead,minis and a minimum value of a radius of curvature at a boundary area between the corrugated section and the inner surface of the battery housing R2, min is, (R1,min+Wbead,min) / PDmax≤OV / PD≤(PDmax−R2,min) / PDmax is fulfilled. Point 22. Battery according to one of the preceding points, wherein a weld area between the first contact section and the bead section is narrower than a flat top surface of the bead section. Point 23. Battery according to one of the preceding points, wherein, if an insertion depth of the corrugated section PD is, a maximum value of the insertion depth PD maxis a distance from an innermost point of the bead section to the center of the weld bead located on a radially outermost side, W is an overlap length OV, where the overlap length is a shortest distance from an end of the first contact section to a vertical line passing through the innermost point of the bead section, a minimum value of OV OV min is a maximum value of the OV OV max is and a minimum value of a weld bead width W bead,min is, (OVmin−0.5*Wbead,min) / PDmax≤W / PD≤(OVmax−0.5*Wbead,min) / PDmax is fulfilled. Point 24. Battery according to one of the preceding points, wherein, if a minimum value of the distance from the innermost point of the bead section to the center point of the weld bead arranged on the radially outermost side is W1, and the distance from the innermost point of the bead section, if the overlap length is OV, to the center point of the weld bead arranged on the radially outermost side is W, W1=R1+0.5*Wbead,min W=OV−0.5*Wbead,min are fulfilled. Point 25. Battery according to one of the preceding points, wherein the corrugated section has a flat area which is at least partially parallel to a lower surface of the battery casing, and if the overlap length is OV and the radius of curvature of the corrugated section is R1, then the length of the flat area of the corrugated section in contact with the first current collector is OV - R1. Point 26. Battery according to one of the preceding points, wherein a radial length in the width direction of a weld pattern formed between the bead section and the first contact section, W bead,min or more and OV - R1 or less. Point 27. Battery according to one of the preceding points, wherein a ratio of the radial width of the weld pattern to the length of the flat area satisfies a range of 10 to 40%. Point 28. Battery according to one of the preceding points, wherein the first connecting section has at least one first bending section which changes at least once in the direction of extension. Point 29. Battery according to any of the preceding points, wherein the first bending section passes through the midpoint of an imaginary straight line connecting an end of the first contact section to an end of the first tab coupling section and is located at a higher position than an imaginary plane parallel to a bottom surface of the battery casing. Point 30. Battery according to any of the preceding points, wherein the at least one first bending section is bent at an obtuse angle so as not to overlap when viewed along a longitudinal axis of the battery casing. Point 31. Battery according to one of the preceding points, wherein a transition between the first contact section and the first connecting section is bent at an obtuse angle. Point 32. Battery according to one of the preceding points, wherein the inclination of the first connecting section decreases stepwise or gradually as it moves towards the corrugated section. Point 33. Battery according to one of the preceding points, wherein an angle between the first tab coupling section and the first connecting section is between 0 and 90°. Point 34. Battery according to one of the preceding points, wherein the first connecting section supports the housing cover. Point 35. Battery according to one of the preceding points, wherein the first tab coupling section and the first contact section are arranged at substantially the same height. Point 36. Battery according to one of the preceding points, wherein the first contact section has a flat surface coupled to an upper surface of the beaded section towards the opening section. Point 37. Battery according to one of the preceding points, wherein the first pantograph has a pantograph opening formed in a center. Point 38. Battery according to one of the preceding points, wherein the current collector opening is provided at a location corresponding to a winding opening formed in a center of the electrode assembly. Item 39. Battery according to any of the preceding items, wherein the diameter of the current collector opening is greater than or equal to the diameter of the winding opening provided in the core of the electrode assembly. Item 40. Battery according to one of the preceding items, wherein the first pantograph further comprises: a second housing coupling section extending from one end of one of the multiple first tab coupling sections and coupled to the inner surface of the battery housing. Item 41. Battery according to one of the preceding items, wherein the second housing coupling section has: a second contact section that is coupled to the inner surface of the battery housing; and a second connecting section that connects the end of one of the multiple first tab coupling sections to the second contact section. Point 42. Battery according to one of the preceding points, wherein at least part of the second contact section extends along an inner circumferential surface of the battery housing. Point 43. Battery according to one of the preceding points, wherein the second connecting section has at least a second bending section which changes at least once in the direction of extension. Point 44. Battery according to any of the preceding points, wherein a distance from a center of the first current collector to an end of the first lug coupling section is substantially less than or equal to a distance from a center of a winding opening of the electrode assembly to an innermost side of the bead section. Point 45. Battery according to one of the preceding points, wherein an upper surface of the corrugated section has a flat area. Point 46. Battery according to one of the preceding points, wherein at least one weld bead is formed between the bead section and the first contact section, and at least one weld bead forms a straight weld pattern that extends along a circumferential direction. Point 47. Battery according to one of the preceding points, wherein at least one weld bead is formed between the bead section and the first contact section, and the at least one weld bead forms an arc-shaped weld pattern extending along a circumferential direction. Point 48. Battery according to one of the preceding points, wherein a weld bead formed between the bead section and the first contact section forms a weld pattern, and The welding pattern has the form of a line created by connecting spot welds. Point 49. Battery according to one of the preceding points, wherein several weld beads formed between the bead section and the first contact section are formed within the same first contact section. Item 50. Battery according to any of the preceding items, wherein the second electrode further comprises a second uncoated area which is not coated with an active material layer and is exposed to the outside of the separator at one end of a long side along a winding direction, and at least part of the second uncoated area itself is used as an electrode tab, and The battery also has a connection that is electrically connected to the second uncoated area through the battery housing on the side opposite the opening section. Item 51. Battery according to one of the preceding items, further comprising: a second current collector located between the electrode assembly and the terminal, the second pantograph has: a second tab coupling section that is coupled to the second uncoated area; and a connection coupling section that is coupled to the connection. Item 52. Battery according to one of the preceding items, wherein the connection coupling section covers a winding opening of the electrode assembly. Point 53. Battery according to one of the preceding points, wherein the outer diameter of the second pantograph is larger than the outer diameter of the first pantograph. Point 54. Battery according to one of the preceding points, wherein the second tab coupling section is coupled to a coupling surface formed by the bending of the second uncoated area. Item 55. Battery according to any of the preceding items, wherein the battery housing has a crimp section formed at the bead section and extending and bent around a circumferential edge of the housing cover. Point 56. Battery according to one of the preceding points, wherein the first housing coupling section is compressed and fixed by the crimp section. Item 57. Battery according to any of the preceding items, wherein the battery further comprises: a seal positioned in the crimp section and arranged between the battery housing and the housing cover. Point 58. Battery according to one of the preceding points, wherein the first contact section is arranged between the bead section and the seal. Point 59. Battery according to one of the preceding points, wherein the first contact section is held by the bend of the crimp section. Item 60. Battery according to one of the preceding items, wherein the seal in a non-contact area with the first contact section has a greater thickness than in a contact area with the first contact section. Item 61. Battery according to one of the preceding items, wherein the seal in a contact area with the first contact section has a greater compression ratio than in a non-contact area with the first contact section. Item 62. Battery according to any of the preceding items, wherein the seal in a contact area with the first contact section has a compression ratio that is substantially equal to a compression ratio in a non-contact area with the first contact section. Point 63. Battery according to one of the preceding points, wherein the thickness of the seal changes for each area along a circumferential direction on the corrugated section. Point 64. Battery according to one of the preceding points, wherein the thickness of the seal alternately increases and decreases several times along a circumferential direction on the corrugated section. Point 65. Battery according to one of the preceding points, wherein the compression ratio of the seal changes for each area along a circumferential direction on the bead section. Point 66. Battery according to one of the preceding points, wherein the first housing coupling section is elastically prestressed at the corrugated section. Point 67. Battery according to any of the preceding points, wherein a connected section between the first contact section and the first connecting section fits an inner surface of the bead section. Point 68. Battery according to any of the preceding points, wherein at least part of the first uncoated area has several segments which are divided along the winding direction of the electrode assembly, and the several segments are bent along a radial direction of the electrode assembly to form a curved surface. Point 69. Battery according to one of the preceding points, wherein the multiple curved segments overlap in multiple layers to form the curved surface, and the curved surface has a zone of increasing stacking number in which the number of overlapping layers of the segments successively increases to a maximum value as it goes from an outer circumference of the electrode assembly to the core, and a zone of uniform stacking number from a radial location where the number of overlapping layers is maximum to a radial location where an innermost segment is present. Point 70. Battery according to one of the preceding points, wherein the first tab coupling section is coupled to the curved surface in such a way that it overlaps with the zone with uniform stacking number. Point 71. Battery following one of the preceding points, wherein the number of overlapping layers of the zone with uniform stacking number is 10 or more. Point 72. Battery according to one of the preceding points, wherein the first tab coupling section is welded to the curved surface and a weld area of the tab coupling section overlaps at least 50% with the zone with uniform stacking number along the radial direction of the electrode assembly. Point 73. Battery according to one of the preceding points, wherein the first uncoated area and the first tab coupling section are coupled by welding along the radial direction of the electrode assembly. Point 74. Battery according to one of the preceding points, wherein the first tab coupling section is coupled to the first uncoated area by welding parallel to a lower surface of the battery housing. Point 75. Battery according to one of the preceding points, wherein a weld bead formed between the first uncoated area and the first tab coupling section forms a straight weld pattern extending along a radial direction of the electrode assembly. Point 76. Battery according to any of the preceding points, wherein a weld bead formed between the first uncoated area and the first tab coupling section forms a weld pattern, and the weld pattern has the form of a line formed by joining spot welds. Point 77. Battery according to one of the preceding points, wherein a width of a weld bead formed between the first uncoated area and the first tab coupling section is 0.1 mm or more. Item 78. Battery according to any of the preceding items, wherein a plurality of first tab coupling sections and a plurality of first housing coupling sections are provided, and the plurality of first tab coupling sections and the plurality of first housing coupling sections are arranged in a radial pattern, a cross pattern or a combined pattern with respect to a center of the first pantograph. Point 79. Battery according to one of the preceding points, wherein each of the plurality of first case coupling sections is positioned between the adjacent first tab coupling sections. Item 80. Battery according to any of the preceding items, wherein a plurality of first housing coupling sections is provided, and the first contact sections of the plurality of first housing coupling sections are connected to each other and formed in one piece. Point 81. Battery according to one of the preceding points, wherein an outermost point of the first connecting section is spaced a predetermined distance from an innermost point of the corrugated section. Point 82. Battery according to one of the preceding points, wherein the angle between the first contact section and the first connecting section through the first bending section is an acute angle. Item 83. Battery according to one of the preceding items, wherein a plurality of insertion openings are provided. Point 84. Battery according to one of the preceding points, wherein the plurality of insertion openings is arranged symmetrically on left and right sides with respect to a center of the first tab coupling section in a width direction. Point 85. Battery according to one of the preceding points, wherein a weld bead is formed for coupling between the first tab coupling section and the first uncoated area between the insertion openings, which are arranged symmetrically on the left and right sides. Point 86. Battery according to any of the preceding points, wherein the first tab coupling section has a greater width at a point at a predetermined distance from a connected section between the first tab coupling section and the support section to an end of the first tab coupling section in a longitudinal direction than a width at the connected section between the first tab coupling section and the support section. Point 87. Battery according to one of the preceding points, wherein the insertion opening is formed at the predetermined distance from the connected section to the end of the first tab coupling section in the longitudinal direction. Point 88. Battery according to one of the preceding points, wherein at least part of an area in which the insertion opening is formed is contained in an extended area by a greater width at the point at the predetermined distance from the connected section to the end of the first tab coupling section than the width at the connected section between the first tab coupling section and the support section. Point 89. Battery according to one of the preceding points, wherein the end of the first tab coupling section has a longitudinal arc shape corresponding to an inner circumferential surface of the battery casing. Point 90. Battery according to one of the preceding points, wherein a direction of expansion of the weld pattern formed between the first uncoated area and the first tab coupling section and a direction of expansion of the weld pattern formed between the bead section and the first contact section are perpendicular to each other. Point 91. Battery according to one of the preceding points, wherein an innermost point of the crimp section is arranged at a radially inner location as an endpoint of the crimp section. Item 92. Battery according to any of the preceding items, wherein the seal surrounds the housing cover and the radial length in any area of the seal covering a lower surface of the housing cover is less than the radial length in any area of the seal covering an upper surface of the housing cover. Item 93. Battery according to any of the preceding items, wherein if a total radial length of the first tab coupling section is equal to T, an outer diameter of the electrode assembly is equal to JR, and a height of the segment positioned at an outermost side of the electrode assembly is equal to F, JR−2*F≤TJR is fulfilled. Item 94. Battery according to any of the preceding items, wherein the ratio of a non-contact area between the first current collector and an upper surface of the electrode assembly to an area of a circle with an outer diameter of the electrode assembly as its diameter is 30% or more and less than 100%. Item 95. Battery according to any of the preceding items, wherein the ratio of a non-contact area between the first current collector and the electrode assembly to an area of a circle with an outer diameter of the electrode assembly as its diameter is 60% or more and less than 100%. Item 96. Battery according to any of the preceding items, wherein a current collector opening diameter is smaller than a winding opening diameter provided in the core of the electrode assembly. Item 97. Battery according to any of the preceding items, wherein, if the diameter of the winding opening is R3, the diameter of the current collector opening is 0.5*R3 or more and less than R3. Item 98. Battery according to any of the preceding items, wherein, if the diameter of the winding opening is R3, the diameter of the current collector opening is 0.7*R3 or more and less than R3. Item 99. Battery according to any of the preceding items, wherein a form factor ratio obtained by dividing a diameter of the battery by a height is greater than 0.4. Item 100. Battery according to any of the preceding items, wherein a measured resistance between a positive electrode and a negative electrode is 4 mΩ or less. Item 101. Battery, showing: an electrode assembly comprising a first electrode, a second electrode and a separator arranged between the first electrode and the second electrode, which is wound around a winding axis defining a core and an outer circumferential surface, wherein the first electrode has a first uncoated area which is not coated with an active material layer and is exposed to the outside of the separator at one end of a long side along a winding direction, and at least part of the first uncoated area itself is used as an electrode tab; a battery housing having an opening on one side to receive the electrode assembly through the opening; and a current collector that is electrically coupled to the first uncoated area and an inner surface of the battery housing, wherein the current collector has a first section that contacts the inner surface of the battery housing, and a second section that is coupled to the first uncoated area, and if a central area of the first section is projected onto a plane in which the second section exists, the central area of the first section and the second section are spaced apart from each other along a circumferential direction of the electrode assembly. Item 102. Battery according to one of the preceding items, further comprising: a seal that is positioned between the opening section of the battery housing and the current collector, the first section is located between the inner surface of the battery housing and the seal. Point 103. Battery according to one of the preceding points, wherein the first section and the second section are arranged on different planes in the winding axial direction of the electrode assembly. Item 104. Current collector electrically connecting an electrode assembly and a battery housing applied to a battery, wherein the current collector comprises: a support section that is positioned on the electrode assembly; a multitude of tab coupling sections extending from the support section and coupled to a first uncoated area of the electrode assembly; and a first housing coupling section extending from the support section, arranged between the adjacent tab coupling sections and electrically coupled to a corrugated section of the battery housing. Item 105. Current collector according to item 104, wherein the lug coupling section and the first housing coupling section are not directly connected to each other and are indirectly connected through the support section. Item 106. Current collector according to one of points 104 or 105, wherein the lug coupling section has at least one insertion opening. Item 107. Current collector according to one of points 104 to 106, wherein the first housing coupling section has: a first contact section that is coupled to an inner surface of the battery housing; and a first connecting section that connects the support section with the first contact section. Point 108. Current collector according to one of points 104 to 107, wherein the first connecting section has at least one first bending section which changes at least once in the direction of extension. Item 109. Current collector according to one of items 104 to 108, wherein the current collector has a current collector opening formed in a center. Item 110. Current collector according to one of items 104 to 109, wherein the current collector further comprises: a second housing coupling section extending from one end of one of the multiple tab coupling sections and coupled to an inner surface of the battery housing. Point 111. Current collector according to one of points 104 to 110, wherein the second housing coupling section has: a second contact section that is coupled to an inner surface of the battery housing; and a second connecting section that connects the end of one of the multiple tab coupling sections to the second contact section. Item 112. Current collector according to one of items 104 to 111, wherein a plurality of first housing coupling sections is provided, and the first contact sections of the multitude of first housing coupling sections are connected to each other and formed in one piece. Point 113. Current collector according to one of points 104 to 112, wherein the angle between the first contact section and the first connecting section is an acute angle due to the first bending section. Item 114. Current collector according to one of items 104 to 113, wherein a plurality of insertion openings are provided. Point 115. Current collector according to one of points 104 to 114, wherein the plurality of insertion openings is arranged symmetrically on left and right sides with respect to a center of the lug coupling section in a width direction. Point 116. Current collector according to one of points 104 to 115, wherein the lug coupling section has a greater width at any point at a predetermined distance from a connected section to an end of the lug coupling section in a longitudinal direction than a width at any connected section between the lug coupling section and the support section. Point 117. Current collector according to one of points 104 to 116, wherein the insertion opening is formed at the predetermined distance from the connected section to the end of the lug coupling section in the longitudinal direction. Point 118. Current collector according to one of points 104 to 117, wherein at least part of an area in which the insertion opening is formed is contained in an extended area by the greater width at the point at the predetermined distance from the connected section to the end of the lug coupling section than the width at the connected section between the lug coupling section and the support section. Point 119. Current collector according to one of points 104 to 118, wherein the end of the lug coupling section has a longitudinal arc shape corresponding to an inner circumferential surface of the battery housing. Item 120. Battery pack comprising a plurality of batteries according to any one of items 1 to 103. Item 121. Battery pack according to item 120, wherein the plurality of batteries is arranged in a predetermined number of columns, and the connection of each battery and an outer surface of the bottom of the battery housing are positioned facing upwards. Item 122. Battery pack according to item 120 or 121, wherein it has a plurality of busbars connecting the plurality of batteries in series and parallel, each busbar is positioned at the adjacent batteries, and Each busbar has: a body segment that extends between the adjacent connections; a multitude of first busbar connections extending to one side of the body section and electrically coupled to the electrode connection of the battery located on one side; and a multitude of secondary busbar connections extending to the other side of the body section and electrically coupled to the outer surface of the bottom of the battery housing of the battery located on the other side. Item 123. Vehicle with at least one battery according to one of points 1 to 103 and / or one battery pack according to one of points 120 to 122. REFERENCE MARK LIST 5 vehicles 3 battery packs 2 Pack cases 1 Cylindrical battery 10 Electrode assembly 11 first uncoated area 12 second uncoated area H1 winding opening 20 battery cases 20a Outer surface of the closed section T1 first electrode connection 21 Corrugated section 22 Crimp section 30 current collectors (first current collector) H2 pantograph opening 31 Support section 32. Tab coupling section (first tab coupling section) H3 insertion opening 33 First housing coupling section 33a first contact section 33b first connecting section 34 second housing coupling section 34a second contact section 34b second connecting section 40 Housing cover 41 Ventilation section G1 sealing element 50 connection T2 second electrode connection G2 Insulation Element 60 current collectors (second current collector) 61 Marginal section 62 Tab coupling section (second tab coupling section) 63 Connection coupling section 64 Bridge section 64a tapered section N power interruption section 70 Insulator QUOTES INCLUDED IN THE DESCRIPTION
[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature
[0000] US 6,677,082
[0175] US 6,680,143
[0175]
Claims
[1] comprising battery (1) an electrode assembly (10) comprising a first electrode, a second electrode and a separator arranged between the first electrode and the second electrode, wherein the first electrode, the second electrode and the separator are wound in one winding direction, wherein the first electrode has a first uncoated area (11) which is free from an active material coating and extends beyond an edge of the separator extending along the winding direction, wherein the second electrode further comprises a second uncoated area (12) which is free from an active material coating, wherein the second uncoated section (12) extends beyond an edge of the separator extending along a winding direction; a battery housing (20) having an opening section on one side thereof, wherein the electrode assembly (10) is accommodated inside the battery housing (20); comprising a first current collector (30), a support section (31) arranged on the electrode assembly (10), a first tab coupling section (32) extending from the support section (31) and coupled to the first uncoated area (11), and a first housing coupling section (33) extending from the support section (31) and connected to an inner surface of the battery housing (20); a housing cover (40) that covers the opening section; and a terminal (50) extending through a closed section of the battery housing (20) on a side of the battery housing opposite the open section, wherein the terminal (50) is electrically connected to the second uncoated area (12). [2] Battery according to claim 1, wherein the first tab coupling section (32) and the first housing coupling section (33) are indirectly connected to each other by the support section (31). [3] Battery according to claim 1 or 2, wherein the battery housing (20) has a corrugated section (21) formed at an end adjacent to the opening section and driven inwards. [4] Battery according to claim 3, wherein the first housing coupling section (33) comprises: a first contact section (33a) connectable or connected to the corrugated section (21) of the battery housing (20); and a first connecting section (33b) that connects the support section (31) to the first contact section (33a). [5] Battery according to claim 4, wherein at least a part of the first connecting section (33b) is convex upwards with respect to an imaginary straight line connecting two ends of the first connecting section (33b) in a longitudinal direction; and / or wherein the first connecting section (33b) has a raised section which is arranged higher than the corrugated section (21). [6] Battery according to claim 4 or 5, wherein the corrugated section (21) comprises: an upper bead section located above an innermost radial point of the driven bead section that is closest to the radial center of the battery; and a lower bead section that is located below the innermost radial point of the bead section. [7] Battery according to claim 6, wherein the upper bead section and the lower bead section are asymmetrical with respect to an imaginary reference plane which runs parallel to a bottom surface of the battery housing (20) through the innermost radial point of the bead section (21). [8] Battery according to claim 6 or 7, wherein at least one first tab coupling section (32) of the first current collector (30) is arranged at a lower position than the lower corrugated section. [9] Battery according to one of claims 6 to 8, wherein the upper corrugated section and / or the lower corrugated section is inclined with respect to a bottom surface of the battery housing (20), wherein the first contact section (33a) is preferably arranged on an inclined upper surface of the corrugated section (21). [10] Battery according to one of claims 6 to 9, wherein the upper bead section and / or the lower bead section is at least partially parallel to a bottom surface of the battery housing (20), wherein the first contact section (33a) is preferably arranged on a flat upper surface of the bead section (21). [11] Battery according to one of claims 6 to 10, wherein the first contact section (33a) is welded to an upper surface of the bead section (21), preferably to a flat area formed on the upper bead section, wherein a weld area between the first contact section (33a) and the bead section (21) is preferably narrower than a flat upper surface of the bead section (21). [12] Battery according to any one of claims 4 to 11, wherein at least a part of the first contact section (33a) has the form of an arc extending in a circumferential direction along the beaded section (21) of the battery housing (20); and / or wherein the first contact section (33a) has the form of an arc extending in opposite directions along a circumferential direction from an intersection point between the first connecting section (33b) and the first contact section (33a) on the beaded section (21). [13] Battery according to any one of claims 3 to 12, wherein an insertion depth PD of the corrugated section (21) PD ≥ R1, min + R2, min + W bead,min fulfilled, where R1, min a minimum value of a radius of curvature of the corrugation section (21) is, W bead,min a minimum value of a weld bead width and R2, mina minimum value of a radius of curvature at a boundary area between the corrugated section (21) and the inner surface of the battery housing (20). [14] Battery according to any one of claims 3 to 13, wherein the insertion depth of the corrugated section (21) is 0.2 to 10 mm, preferably 0.2 mm to 8 mm, more preferably 0.2 mm to 5 mm. [15] Battery according to any one of claims 5 to 14, wherein a ratio OV / PD of an overlap length OV to an insertion depth PD of the corrugated section (21) is the equation (R1, min + W bead,min ) / PD max ≤ OV / PD ≤ (PD max - R2,min) / PD max fulfilled, where PD maxa maximum value of the insertion depth, the overlap length OV is the shortest distance from an end of the first contact section (33a) to a vertical line passing through an innermost radial point of the bead section (21), R1,min is a minimum value of a radius of curvature of the bead section (21), a minimum value of a weld bead width W bead,min is and R2 min a minimum value of a radius of curvature at a boundary area between the corrugated section (21) and the inner surface of the battery housing (20). [16] Battery according to one of claims 5 to 15, wherein a ratio W / PD of a radial distance W from an innermost radial point of the bead section (21) to a center point of a weld bead arranged at an outermost radial point, to an insertion depth PD of the bead section (21) is the equation (OV min -0.5* W bead,min ) / PD max ≤ W / PD ≤ (OV max -0.5* W bead,min ) / PD maxfulfilled, whereby a maximum value of the press-in depth PD is specified. max is an overlap length OV, where the overlap length is a shortest distance from an end of the first contact section (33a) to a vertical line passing through the innermost radial point of the bead section (21), a minimum value of OV OV min is a maximum value of OV OV max is and a minimum value of a weld bead width W bead,min is, where a minimum value W1 of the distance W and the distance W preferably corresponds to the equation W1 = R1 + 0.5 * W bead,min and W = OV - 0.5 * W bead,min fulfill. [17] Battery according to any one of claims 3 to 16, wherein the beaded section (21) has a flat area that is at least partially parallel to a lower surface of the battery housing (20), and wherein a length of a section of the flat area of the beaded section (21) that contacts the first current collector (30) is OV - R1, wherein OV is an overlap length corresponding to a shortest distance from an end of the first contact section (33a) to a vertical line passing through an innermost radial point of the beaded section (21), and R1 is a radius of curvature of the beaded section (21), wherein a radial extent of a weld pattern formed between the beaded section (21) and the first contact section (33a) is preferably W bead,min or more and OV - R1 or less, wherein the ratio of the radial extent of the weld pattern to the length of the flat area is in a range of 10% to 40%. [18] Battery according to any one of claims 5 to 17, wherein the first connecting section (33b) comprises at least one first bending section which changes at least once in the direction of extension, wherein the first bending section preferably passes through the center of an imaginary straight line connecting an end of the first contact section (33a) to an end of the first tab coupling section (32), and which is arranged at a point above an imaginary plane parallel to a bottom surface of the battery housing (20); and / or wherein the at least one first bending section is preferably bent at an obtuse angle in order not to overlap with itself when viewed along a longitudinal axis of the battery housing (20); and / or wherein a transition between the first contact section (33a) and the first connecting section (33b) is preferably bent at an obtuse angle. [19] Battery according to any one of claims 5 to 18, wherein the inclination of the first connecting section (33b) in the direction of the corrugated section (21) decreases stepwise or gradually. [20] Battery according to any one of claims 5 to 19, wherein the angle between the first tab coupling section (32) and the first connecting section (33b) is between 0 and 90°. [21] Battery according to any one of claims 5 to 20, wherein the first connecting section (33b) supports the housing cover (40). [22] Battery according to any one of claims 5 to 21, wherein the first tab coupling section (32) and the first contact section (33a) are arranged at substantially the same height. [23] Battery according to any one of claims 5 to 22, wherein the first contact section (33a) has a flat surface which is connected to an upper surface of the corrugated section (21). [24] Battery according to one of the preceding claims, wherein the first current collector (30) has a current collector opening (H2) formed in a center thereof, wherein the current collector opening (H2) is preferably provided at a location corresponding to a winding opening (H1) formed in a center of the electrode assembly (10), wherein a diameter of the current collector hole (H2) is further preferably larger than or greater than F - , Cl - , Br - , I - , NO3 - , N (CN)2 - , BF4 - , ClO4 - , AlO4 - , AlCl4 - , PF6 - , SbF6 - , AsF6 - , BF2C2O4 - , BC4O8 - , (CF3)2PF4 - , (CF3)3PF3 - , (CF3)4PF2 - , (CF3)5PF - , (CF3)6P - , CF3SO3 - , C4F g SpO3 - , CF3CF2SO3 - s (CF3SO2)2N - , (FSO2)2N - , CF3CF2 (CF3)2CO- , (CF3SO2)2CH - , (SF5)3C - , (CF3SO2)3C - , CF3 (CF2)7SO3 - , CF3CO2 - , CH3CO2 - , SCN - and (CF3CF2SO2)2N - consists of the same diameter of the winding opening (H1) which is provided in the core of the electrode assembly (10). [25] Battery according to one of the preceding claims, wherein the first current collector (30) further comprises: a second housing coupling section (34) extending from one end of one of the plurality of first tab coupling sections (32) and connected to the inner surface of the battery housing (20), wherein the second housing coupling section (34) preferably further comprises: a second contact section (34a) which is connected to the inner surface of the battery housing (20); and a second connecting section (34b) which connects the end of one of the plurality of first tab coupling sections (32) to the second contact section (34a), wherein preferably at least a part of the second contact section (34a) extends along an inner circumferential surface of the battery housing (20) and / or wherein the second connecting section (34b) preferably has at least a second bending section which changes one direction of extension therein at least once. [26] Battery according to any one of claims 3 to 25, wherein a distance from a center of the first current collector (30) to an end of the first tab coupling section (32) is substantially less than or equal to a distance from a center of a winding opening (H1) of the electrode assembly (10) to an innermost side of the bead section (21). [27] Battery according to one of the preceding claims, wherein at least one weld bead is formed between the beaded section (21) and the first contact section (33a), and the at least one weld bead forms a straight weld pattern extending along a circumferential direction. [28] Battery according to one of the preceding claims, wherein at least one weld bead is formed between the beaded section (21) and the first contact section (33a), and at least one weld bead forms an arc-shaped weld pattern extending along a circumferential direction; and / or wherein a weld bead formed between the bead section (21) and the first contact section (33a) forms a weld pattern, wherein the weld pattern has a linear shape formed by spot welding; and / or wherein several weld bead sections are formed between the bead section (21) and the same first contact section (33a). [29] Battery according to claim 1, further comprising: a second current collector (60) which is arranged between the electrode assembly (10) and the terminal (50), the second pantograph (60) has: a second tab coupling section (32) which is electrically coupled to the second uncoated area (12); and a terminal (50) coupling section which is electrically coupled to the terminal (50), wherein the terminal coupling section preferably covers a winding opening (H1) of the electrode assembly (10); and / or wherein the outer diameter of the second current collector (60) is preferably larger than the outer diameter of the first current collector (30); and / or wherein the second tab coupling section (32) is preferably connected to a coupling surface formed by a bending of the second uncoated area (12). [30] Battery according to any one of claims 4 to 29, wherein the battery housing (20) has a crimp section (22) formed above the bead section (21), wherein the crimp section (22) extends around a circumferential edge of the housing cover (40) and is bent, wherein the first housing coupling section (33) is preferably pressure-fixed by the crimp section (22). [31] Battery according to claim 30, further comprising a sealing element (G1) arranged in the crimp section (22) and positioned between the battery housing (20) and the housing cover (40), wherein the first contact section (33a) is preferably arranged between the beaded section (21) and the sealing element (G1); and / or wherein the first contact section (33a) is held by the bend of the crimp section (22). [32] Battery according to claim 31, wherein at least one section of the sealing element (G1) in a non-contact area where the sealing element (G1) does not touch the first contact section (33a) has a first thickness and a second thickness in a contact area where the sealing element (G1) touches the first contact section (33a), wherein the first thickness is greater than the second thickness; and / or wherein a thickness of the sealing element (G1) varies along a circumferential direction, preferably by repeated alternating increases and decreases of the thickness along the circumferential direction. [33] Battery according to claim 31 or 32, wherein at least one section of the sealing element (G1) in a contact area where the sealing element (G1) contacts the first contact section (33a) has a first compression ratio and in a non-contact area where the sealing element (G1) does not contact the first contact section (33a) has a second compression ratio, wherein the first compression ratio is greater than or equal to the second compression ratio; and / or wherein a compression ratio of the sealing element (G1) varies along the circumferential direction. [34] Battery according to any one of claims 3 to 33, wherein the first housing coupling section (33) is elastically prestressed on the corrugated section (21). [35] Battery according to any one of claims 3 to 34, wherein a connecting section arranged between the first contact section (33a) and the first connecting section (33b) fits an inner surface of the bead section (21), wherein the first contact section (33a) and the first connecting section (33b) are connected by the connecting section. [36] Battery according to one of the preceding claims, wherein at least a part of the first uncoated area (11) has several segments (11a) separated from each other along the winding direction of the electrode assembly (10), and wherein the several segments (11a) are bent along a radial direction of the electrode assembly (10) to form a tab surface. [37] Battery according to claim 36, wherein the multiple curved segments (11a) overlap in multiple layers to form the tab surface, and the tab surface comprises a first radial section and a second radial section, wherein in the first radial section the number of overlapping layers of the segments (11a) increases sequentially from a first radial location corresponding to an outer circumference of the wound electrode assembly (10) to a second radial location where the number of overlapping layers of the multiple segments (11a) reaches a maximum value, the second radial location being closer to the radial center than the first radial location; and wherein the second radial section covers a radial area from the second radial point to a third radial point which corresponds to a radial point of an innermost segment of the multiple segments (11a), wherein the third radial point is closer to the radial center than the second radial point. [38] Battery according to claim 36 or 37, wherein the first tab coupling section (32) is coupled to the tab surface which overlaps the second radial section, wherein the first tab coupling section (32) is preferably welded to the tab surface, wherein a welded section of the tab coupling section (32) overlaps at least 50% of an extent of the second radial section along the radial direction of the electrode assembly (10). [39] Battery according to one of the preceding claims, wherein the first uncoated area (11) and the first tab coupling section (32) are coupled to each other by welding along the radial direction of the electrode assembly (10); wherein a weld bead formed between the first uncoated area (11) and the first tab coupling section (32) preferably forms a straight weld pattern extending along a radial direction of the electrode assembly (10); and / or wherein a weld bead formed between the first uncoated area (11) and the first tab coupling section (32) preferably forms a weld pattern having the shape of a line formed by one or more weld spots; and / or wherein the width of a weld bead formed between the first uncoated area (11) and the first tab coupling section (32) is preferably 0.1 mm or more; and / or wherein the first tab coupling section (32) is coupled to the first uncoated area (11) by welding preferably parallel to a lower surface of the battery housing (20). [40] Battery according to one of the preceding claims, comprising a plurality of first tab coupling sections (32) and a plurality of first housing coupling sections (33), wherein the plurality of first tab coupling sections (32) and the plurality of first housing coupling sections (33) are arranged in a radial pattern, a cross pattern or a combined pattern with respect to a center of the first current collector (30), wherein preferably each of the plurality of first housing coupling sections (33) is arranged between adjacent first tab coupling sections (32). [41] Battery according to one of the preceding claims, further comprising a plurality of first housing coupling sections (33), wherein the first contact sections (33a) of the plurality of first housing coupling sections (33) are connected to each other and formed in one piece. [42] Battery according to any one of claims 5 to 41, wherein the angle between the first contact section (33a) and the first connecting section (33b) is an acute angle due to the first bending section. [43] Battery according to one of the preceding claims, wherein the first tab coupling section (32) has at least one insertion opening (H3), wherein the first tab coupling section (32) preferably has a plurality of insertion openings (H3) which are arranged symmetrically on left and right sides with respect to a radial center line of the first tab coupling section (32), wherein a weld bead which couples the first tab coupling section (32) and the first uncoated area (11) is formed between the symmetrically arranged insertion openings (H3). [44] Battery according to claim 43, wherein the extent of the first tab coupling section (32) in a circumferential direction at a distal radial location is greater than the extent of the first tab coupling section (32) in the circumferential direction at a connecting section where the first tab coupling section (32) and the support section (31) are adjacent to each other, wherein the distal radial location is further away from the radial center of the battery in the radial direction than the connecting section, wherein the insertion opening (H3) is preferably formed at the distal radial location. [45] Battery according to claim 43 or 44, wherein an end section of the first tab coupling section (32) which is located furthest from a radial center of the battery has the shape of an arc which corresponds to an inner circumferential surface of the battery housing (20). [46] Battery according to one of the preceding claims, wherein the weld pattern formed between the first uncoated area (11) and the first tab coupling section (32) and the weld pattern formed between the bead section (21) and the first contact section (33a) extend perpendicular to each other. [47] Battery according to any one of claims 30 to 46, wherein an innermost radial point of the bead section (21) is closer in a radial direction to a radial center of the battery than an end point of the crimp section (22), wherein the crimp section (22) extends from the bead section (21) to the end point of the crimp section. [48] Battery according to any one of claims 31 to 47, wherein the sealing element (G1) surrounds the housing cover (40), and wherein an extension of a section of the sealing element (G1) covering a lower surface of the housing cover (40) in the radial direction is smaller than an extension of a section of the sealing element (G1) in the radial direction covering an upper surface of the housing cover (40). [49] Battery according to any one of claims 36 to 48, wherein a radial total extent T of the first tab coupling section (32) satisfies JR - 2*F ≤ T JR, where JR is an outer diameter of the electrode assembly (10) and F is a height of an outermost segment (11a) of the multiple segments (11a). [50] Battery according to one of the preceding claims, wherein the ratio of an area in which the first current collector (30) does not touch an upper surface of the electrode assembly (10) to an area of a circle with an outer diameter corresponding to a diameter of the electrode assembly (10) is 30% or more and less than 100%, preferably 60% or more and less than 100%. [51] Battery according to any one of claims 24 to 50, wherein a diameter of the current collector opening (H2) is smaller than a diameter of a winding opening (H1) of the core of the electrode assembly (10), wherein for a diameter R3 of the winding opening (H1) the diameter of the current collector opening (H2) is 0.5*R3 or more and less than R3 or 0.7*R3 or more and less than R3. [52] Battery according to any of the preceding claims, wherein a form factor ratio obtained by dividing a diameter of the battery by a height of the battery is greater than 0.
4. [53] Battery according to any of the preceding claims, wherein a resistance measurable between the first electrode and the second electrode and / or between the second electrode and the first electrode is 4 mΩ or less. [54] Battery comprising: an electrode assembly (10) comprising a first electrode, a second electrode and a separator arranged between the first electrode and the second electrode, wherein the first electrode, the second electrode and the separator are wound in a winding direction, wherein the first electrode has a first uncoated area (11) which is free from an active material coating and which extends along the winding direction beyond an edge of the separator, wherein the second electrode further comprises a second uncoated area (12) which is free from an active material coating, wherein the second uncoated section (12) extends beyond an edge of the separator extending along a winding direction; a battery housing (20) having an opening section on one side thereof, wherein the electrode assembly (10) is accommodated inside the battery housing (20); a current collector (30) that is electrically coupled to the first uncoated area (11) and to an inner surface of the battery housing (20); and a terminal (50) extending through a closed section of the battery housing (20) on a side of the battery housing opposite the open section, wherein the terminal (50) is electrically connected to the second uncoated area (12), wherein the current collector (30) has a first section which contacts the inner surface of the battery housing (20) and a second section which is coupled to the first uncoated area (11), and wherein a projection of at least a central region of the first section, which is projected onto a plane in which the second section extends, is separated from the second section in a circumferential direction of the electrode assembly (10). [55] Battery according to claim 54, further comprising: a sealing element (G1) arranged between the open section of the battery housing (20) and the current collector (30), wherein the first section is arranged between the inner surface of the battery housing (20) and the sealing element (G1). [56] Battery according to claim 54 or 55, wherein the first section is arranged in a first plane perpendicular to a height of the battery, the second section is arranged in a second plane perpendicular to a height of the battery, wherein the first and the second plane are spaced apart from each other in a direction parallel to the height of the battery. [57] Battery according to one of the preceding claims, wherein the current collector (30) electrically connects the electrode arrangement (10) to the battery housing (20), wherein the current collector (30) comprises: a plurality of tab coupling sections (32) extending from the support section (31) and coupled to a first uncoated region (11) of the electrode arrangement (10), wherein the plurality of tab coupling sections (32) includes the first tab coupling section; and wherein the first housing coupling section (33) is arranged between adjacent tab coupling sections (32) and is electrically connected to a bead section (21) of the battery housing (20). [58] Battery pack (3) comprising a plurality of batteries according to one of the preceding claims, wherein the plurality of batteries is preferably arranged in columns, wherein the terminal (50) and an outer surface of a top of the battery housing (20) of each battery are preferably arranged to face a plurality of busbars (150) configured to connect the plurality of batteries in series and in parallel. [59] Vehicle (5) comprising at least one battery according to any one of claims 1 to 57 and / or the battery pack (3) according to claim 58.
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