Cylindrical battery and electric equipment with same

Abstract

The invention discloses a cylindrical battery and electric equipment with the cylindrical battery, the cylindrical battery comprises a pole shank and a collector plate, the pole shank is cylindrical, at least one side of the pole shank is provided with a tab welding area in the axial direction of the pole shank, the collector plate is suitable for being in welded connection with the tab welding area, and the tab welding area is in welded connection with the collector plate in the radial direction parallel to the pole shank. The collector plate is provided with an outer ring area, a middle ring area and an inner ring area from outside to inside, the middle ring area is located between the outer ring area and the inner ring area, the middle ring area is provided with a first welding line, at least one of the inner ring area and the outer ring area is provided with a second welding line, the first welding line extends in the radial direction of the pole core, and the second welding line extends in the circumferential direction of the pole core. And the collector plate and the tab welding area are welded and connected through the first welding lines and the second welding lines. According to the cylindrical battery provided by the embodiment of the invention, not only is the welding connection of the collector plate and the tab welding area realized, but also the welding quality can be ensured, the phenomenon of insufficient welding or over-welding is avoided to a certain extent, and the performance of the cylindrical battery is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a cylindrical battery and an electrical device having the same. Background Art

[0002] Cylindrical batteries are widely used in various electrical equipment due to their advantages such as good consistency, high energy density and low internal resistance.

[0003] However, when welding the tabs of the pole core and the current collecting plate in existing cylindrical batteries, cyclic spot welding is usually used. Due to the uncontrollable heat superposition, this welding method is prone to cold welding or over-welding, which reduces the performance of the cylindrical battery. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a cylindrical battery that can ensure the welding quality between the current collector plate and the tab to a certain extent, thereby preventing the occurrence of cold welding or over-welding to a certain extent, improving the performance of the cylindrical battery, and solving the technical problem of cold welding or over-welding between the tab and the current collector plate in the prior art.

[0005] The present invention also aims to provide an electrical device having the cylindrical battery.

[0006] According to an embodiment of the present invention, a cylindrical battery includes: a pole core, which is formed in a cylindrical shape, and in the axial direction of the pole core, at least one side of the pole core is provided with a pole tab welding area; a current collecting plate, which is suitable for being welded to the pole tab welding area, and in the radial direction parallel to the pole core, the current collecting plate is provided with an outer ring area, a middle ring area and an inner ring area from the outside to the inside, the middle ring area is located between the outer ring area and the inner ring area, the middle ring area is provided with a first weld mark, and at least one of the inner ring area and the outer ring area is provided with a second weld mark, the first weld mark extends along the radial direction of the pole core, and the second weld mark extends along the circumferential direction of the pole core, and the current collecting plate is welded to the pole tab welding area through the first weld mark and the second weld mark.

[0007] According to the cylindrical battery of an embodiment of the present invention, a first weld line extending in the radial direction of the pole core is provided in the middle ring area of ​​the current collecting disk, and a second weld line extending in the circumferential direction of the pole core is provided on at least one of the inner ring area and the outer ring area of ​​the current collecting disk, so as to realize the formation of weld lines with different extension directions on the current collecting disk. In this way, when the current collecting disk and the pole tab welding area are welded and connected by the first weld line and the second weld line, not only the welding connection between the current collecting disk and the pole tab welding area can be realized, but also the welding area between the current collecting disk and the pole tab welding area can be ensured, and the welding quality between the current collecting disk and the pole tab welding area can be improved, thereby avoiding the phenomenon of cold welding or over-welding to a certain extent, and improving the performance of the cylindrical battery.

[0008] In some embodiments, in the radial direction of the pole core, the pole core includes a plurality of pole tabs, and the plurality of pole tabs are bent inward to define the pole tab welding area. The bending length of each pole tab is L1, the radial dimension of the inner ring area is H1, and the radial dimension of the outer ring area is H2. The cylindrical battery satisfies: 0.8L1≤H1≤1.3L1, and / or, 0.8L1≤H2≤1.3L1.

[0009] In some embodiments, a second weld mark is provided in the outer ring region, and in a radial direction parallel to the pole core, there is a spacing H3 between the outermost second weld mark in the outer ring region and the outer peripheral wall of the pole core.

[0010] In some embodiments, the distance H3 is ≥ 2 mm.

[0011] In some embodiments, at least one second weld mark is provided in the outer ring area, and the radial width of each second weld mark in the outer ring area is ≤0.5 mm; and / or, at least one second weld mark is provided in the inner ring area, and the radial width of each second weld mark in the inner ring area is ≤0.5 mm.

[0012] In some embodiments, the second weld mark in the outer ring area is formed in an arc shape, a straight line shape, or a wavy shape.

[0013] In some embodiments, a plurality of second weld lines are provided in the outer ring region and are spaced apart along the radial direction of the pole core.

[0014] In some embodiments, a plurality of second weld lines are provided in the inner ring region and are spaced apart along the radial direction of the pole core.

[0015] In some embodiments, the distance between radially adjacent second weld lines in the inner ring region ranges from 0.3 mm to 1.5 mm.

[0016] In some embodiments, the second weld mark in the inner ring area is formed in an arc shape, a straight line shape, or a wavy shape.

[0017] In some embodiments, in the radial direction parallel to the pole core, there is a spacing H4 between the innermost second weld mark in the inner ring area and the inner edge of the pole tab welding area, and the innermost second weld mark in the inner ring area is located radially outside the inner edge of the pole tab welding area.

[0018] In some embodiments, the distance H4 is ≥ 2 mm.

[0019] In some embodiments, the first weld mark is formed as a continuously extending weld mark; or, the first weld mark includes a plurality of sub-weld marks spaced apart in a radial direction of the pole core.

[0020] In some embodiments, the current collecting plate is provided with a plurality of weld line groups spaced apart along the circumference of the pole core, and each weld line group includes a first weld line and a second weld line.

[0021] In some embodiments, each group of the weld mark groups includes at least one group of first weld mark groups, and each group of the first weld mark groups includes a plurality of the first weld marks spaced apart along the circumference of the pole core.

[0022] In some embodiments, each group of the first weld lines includes a plurality of the first weld lines arranged in parallel.

[0023] In some embodiments, at least a portion of the first weld lines in each group of the first weld lines are arranged in a cross-arrangement. When there are multiple intersections, the spacing between adjacent intersections is greater than 2 mm.

[0024] In some embodiments, each group of the weld mark groups includes multiple groups of first weld mark groups arranged at circumferential intervals along the pole core, each group of the first weld mark groups includes multiple first weld marks arranged at circumferential intervals along the pole core, and each group of the first weld mark groups is provided with the second weld marks on the radial inner side and the radial outer side.

[0025] In some embodiments, each group of the weld mark groups includes multiple groups of outer ring second weld mark groups corresponding to multiple groups of the first weld mark groups, multiple groups of the outer ring second weld mark groups are arranged in the outer ring area and located radially outside the first weld mark group, and each group of the outer ring second weld mark groups includes multiple second weld marks arranged at radial intervals along the pole core; and / or, each group of the weld mark groups includes multiple groups of inner ring second weld mark groups corresponding to multiple groups of the first weld mark groups, multiple groups of the inner ring second weld mark groups are arranged in the inner ring area and located radially inside the first weld mark group, and each group of the inner ring second weld mark group includes multiple second weld marks arranged at radial intervals along the pole core.

[0026] In some embodiments, each group of the weld mark groups includes multiple groups of outer ring second weld mark groups and one group of inner ring second weld mark groups corresponding to the multiple groups of the first weld mark groups. The multiple groups of the outer ring second weld mark groups are arranged in the outer ring area and are located radially outside the first weld mark group. Each group of the outer ring second weld mark groups includes a plurality of second weld marks arranged at radial intervals along the pole core. The inner ring second weld mark group is arranged in the inner ring area and is located radially inside the multiple groups of the first weld mark groups. The inner ring second weld mark group includes a plurality of second weld marks arranged at radial intervals along the pole core.

[0027] In some embodiments, the second weld lines in the outer ring second weld line group and the second weld lines in the inner ring second weld line group are formed into independent arc shapes, straight lines or wavy shapes.

[0028] An electrical device according to an embodiment of the present invention includes the aforementioned cylindrical battery.

[0029] According to the electric device of the embodiment of the present invention, the working performance of the electric device is improved by adopting the aforementioned cylindrical battery.

[0030] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0032] Figure 1 Schematic diagram of cylindrical batteries according to some embodiments of the present invention.

[0033] Figure 2 Schematic diagram of the welding process between the tab and the current collecting plate according to some embodiments of the present invention.

[0034] Figure 3 for Figure 2 A magnified view of some of the structures in .

[0035] Figure 4 Schematic diagram of the welding of the electrode tab and the current collecting plate in some embodiments of the present invention.

[0036] Figure 5 Schematic diagram of the collecting plate of some embodiments of the first aspect of the present invention.

[0037] Figure 6 Schematic diagrams of tabs and weld lines according to some embodiments of the present invention.

[0038] Figure 7 for Figure 6 A partial enlarged view of area I in the middle.

[0039] Figure 8 Schematic diagram of the tabs of the pole core during the smoothing process according to some embodiments of the present invention.

[0040] Figure 9 Schematic diagram of a current collecting plate according to some embodiments of the second aspect of the present invention.

[0041] Figure 10 Schematic diagram of the collecting plate of some embodiments of the third aspect of the present invention.

[0042] Figure 11 Schematic diagram of the collecting plate of some embodiments of the fourth aspect of the present invention.

[0043] Reference numerals:

[0044] 1000, cylindrical battery;

[0045] 100, pole core;

[0046] 110. Tab welding area;

[0047] 120, extreme ears;

[0048] 200, collecting plate;

[0049] 210, Outer Ring Area;

[0050] 220, Central Area;

[0051] 230, inner ring area;

[0052] 240, weld pattern group;

[0053] 241, first weld line; 2411, sub-weld line;

[0054] 242, second weld line;

[0055] 243, first weld line group;

[0056] 244, outer ring second weld line group;

[0057] 245, inner ring second weld line group;

[0058] 250, first connecting portion;

[0059] 260, second connecting portion;

[0060] 300. Shell. DETAILED DESCRIPTION

[0061] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0062] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0063] In the description of the present invention, features defined as “first” or “second” may explicitly or implicitly include one or more such features, and are used to distinguish and describe features, without any distinction in order or importance.

[0064] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0065] The cylindrical battery 1000 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0066] like Figure 1 As shown, a cylindrical battery 1000 according to an embodiment of the present invention includes: a pole core 100 and a current collecting plate 200.

[0067] The pole core 100 is formed into a cylindrical shape. Figure 1 As shown, in the axial direction of the pole core 100, a tab welding area 110 is provided on at least one side of the pole core 100. Here, the tab welding area 110 can be provided on one side of the pole core 100 in the axial direction, or on both sides of the pole core 100 in the axial direction, so as to facilitate the use of the tab welding area 110 to achieve electrical connection between the pole core 100 and the current collecting plate 200, reduce the difficulty of connecting the pole core 100 and the current collecting plate 200, and help ensure the working performance of the cylindrical battery 1000.

[0068] At the same time, by setting the pole core 100 to a cylindrical shape, it can be ensured that the battery after molding is formed into a cylindrical battery 1000, thereby ensuring the working performance of the battery.

[0069] In some embodiments, as Figure 1As shown, the cylindrical battery 1000 also includes a shell 300, and the pole core 100 is arranged in the shell 300, so that the shell 300 can be used to protect the pole core 100, extend the service life and safety of the pole core 100, and at the same time, the shell 300 can also be used to support the pole core 100 to improve the position stability of the pole core 100.

[0070] Combine Figure 1 、 Figure 2 and Figure 4 As shown, the collecting plate 200 is suitable for welding with the tab welding area 110. In the radial direction parallel to the pole core 100, the collecting plate 200 is provided with an outer ring area 210, a middle ring area 220 and an inner ring area 230 from the outside to the inside (combined with Figure 1 and Figure 5 As shown in FIG. 1 , the middle ring region 220 is located between the outer ring region 210 and the inner ring region 230. The middle ring region 220 is provided with a first weld line 241. At least one of the inner ring region 230 and the outer ring region 210 is provided with a second weld line 242. The first weld line 241 extends in the radial direction of the pole core 100, and the second weld line 242 extends in the circumferential direction of the pole core 100. The current collecting plate 200 is welded to the tab welding region 110 via the first weld line 241 and the second weld line 242. It can also be understood here that the outer ring region 210, the middle ring region 220, and the inner ring region 230 on the current collecting plate 200 are arranged sequentially from outside to inside along a radial direction parallel to the pole core 100, thereby achieving the goal of arranging the middle ring region 220 between the outer ring region 210 and the inner ring region 230, arranging the outer ring region 210 outside the middle ring region 220, and arranging the inner ring region 230 inside the middle ring region 220.

[0071] It should be noted that the outer ring area 210, the middle ring area 220 and the inner ring area 230 are only used to divide the areas on the collecting plate 200 along the radial direction parallel to the pole core 100 for the convenience of description. The specific positions and coverage areas of the outer ring area 210, the middle ring area 220 and the inner ring area 230 on the collecting plate 200 can be adaptively adjusted according to the structure of the collecting plate 200 and the structure of the pole tab welding area 110 without specific restrictions, and the existence of the outer ring area 210 and the inner ring area 230 has nothing to do with whether there is a second weld mark 242.

[0072] It should also be noted that the tab welding area 110 on the end face of the cylindrical battery 1000 is generally formed into a laminated structure after molding, resulting in different thicknesses of the tab welding area 110 corresponding to the outer ring area 210 and the inner ring area 230 in the radial direction of the pole core 100 (e.g. Figure 2 and Figure 4As shown), the thickness of the tab welding area 110 corresponding to the outer ring area 210 gradually becomes thicker from the outside to the inside, and the thickness of the tab welding area 110 corresponding to the inner ring area 230 gradually becomes thinner from the outside to the inside, but the thickness of the tab welding area 110 corresponding to the middle ring area 220 is the same from the outside to the inside. At this time, if the weld lines in the outer ring area 210, the middle ring area 220 and the inner ring area 230 are all set to extend along the radial direction of the pole core 100, it will cause part of the weld lines in the outer ring area 210 and the inner ring area 230 to pass through the tab welding area 110 and the welding area between part of the weld lines and the tab welding area 110 is small, which is prone to cold welding and over-welding, affecting the welding effect of the collecting plate 200 and the tab welding area 110.

[0073] That is to say, the area with different thickness of the corresponding tab welding area 110 on the collecting plate 200 is defined as the outer ring area 210 or the inner ring area 230, and the area with the same thickness of the corresponding tab welding area 110 on the collecting plate 200 is defined as the middle ring area 220. When the thickness of the corresponding tab welding area 110 on the collecting plate 200 gradually becomes thicker from the outside to the inside, the area is defined as the outer ring area 210; when the thickness of the corresponding tab welding area 110 on the collecting plate 200 gradually becomes thinner from the outside to the inside, the area is defined as the inner ring area 230.

[0074] Based on this, the present application sets a first weld line 241 extending along the radial direction of the pole core 100 in the middle ring area 220 and a second weld line 242 extending along the circumferential direction of the pole core 100 in at least one of the inner ring area 230 and the outer ring area 210. In this way, when the current collecting plate 200 and the pole tab welding area 110 are welded together through the first weld line 241 and the second weld line 242, the thickness of the pole tab welding area 110 welded by the first weld line 241 and the second weld line 242 can be made the same, avoiding the phenomenon of cold welding or over welding of the first weld line 241 and the second weld line 242, thereby ensuring the welding quality of the current collecting plate 200 and the pole tab welding area 110 to a certain extent, and improving the working performance of the cylindrical battery 1000.

[0075] It should also be noted that the first weld mark 241 mentioned above extends along the radial direction of the pole core 100. The first weld mark 241 may extend in a radial direction parallel to the pole core 100, or the first weld mark 241 may extend in a direction having a certain angle with the radial direction of the pole core 100. That is to say, the extension direction of the first weld mark 241 may be parallel to the radial direction of the pole core 100, or may form a certain angle with the radial direction of the pole core 100; accordingly, the second weld mark 242 extends in the circumferential direction of the pole core 100. The second weld mark 242 may extend in a circumferential direction parallel to the circumferential direction of the pole core 100, or may extend in a direction having a certain angle with the circumferential direction of the pole core 100.

[0076] At the same time, the present application sets a first weld line 241 in the middle ring area 220 and sets a second weld line 242 in at least one of the inner ring area 230 and the outer ring area 210, so that at least one of the inner ring area 230 and the outer ring area 210 and the middle ring area 220 of the current collecting plate 200 are designed with weld lines. Compared with the prior art of only setting weld lines in the middle ring area 220, the welding area between the current collecting plate 200 and the pole core 100 can be effectively increased. While ensuring the welding stability of the current collecting plate 200 and the pole core 100, it is also possible to form an overcurrent on at least one of the inner ring area 230 and the outer ring area 210 of the current collecting plate 200, thereby improving the overcurrent capacity of the current collecting plate 200, thereby improving the performance of the cylindrical battery 1000.

[0077] In summary, the present application divides the welding surface of the collecting plate 200 according to the thickness difference of the tab welding area 110, and adopts different welding pattern patterns for welding to ensure that the thickness of the tab welding area 110 welded by different welding patterns is the same, which facilitates the fine control of welding energy and avoids the occurrence of cold welding or over-welding, thereby ensuring the welding effect of the collecting plate 200 and the tab welding area 110 to a certain extent, and improving the working performance of the cylindrical battery 1000.

[0078] It can be seen from the above structure that the cylindrical battery 1000 of the embodiment of the present invention, based on the performance of the tab welding area 110 on the end face of the cylindrical battery 1000 forming a stacked structure after molding, divides the welding surface of the collecting plate 200, and controls the extension direction of the weld mark in different areas, so that the thickness of the weld mark in the tab welding area 110 welded when the collecting plate 200 and the pole core 100 are the same, avoiding the phenomenon of cold welding or over welding of the first weld mark 241 and the second weld mark 242, ensuring the welding effect of the collecting plate 200 and the tab welding area 110, and improving the working performance of the cylindrical battery 1000.

[0079] The relative position relationship between the first weld line 241, the second weld line 242 and the tab welding area 110 can also be seen in FIG. Figure 6 .

[0080] It can be understood that compared with the prior art, the present application partitions the welding surface of the collecting plate 200 according to the thickness change of the tab welding area 110, and limits the extension direction of the weld mark in different areas, so that the thickness of the tab welding area 110 welded by the first weld mark 241 and the second weld mark 242 is the same, avoiding the occurrence of cold welding or over-welding, and improving the working performance of the cylindrical battery 1000.

[0081] In some embodiments, the collecting plate 200 is arranged at the axial end of the pole core 100 so that the collecting plate 200 is arranged close to the pole tab welding area 110 of the pole core 100, thereby facilitating the welding connection between the collecting plate 200 and the pole tab welding area 110, reducing the difficulty of welding the collecting plate 200 and the pole tab welding area 110, and further reducing the difficulty of connecting the collecting plate 200 to the pole core 100.

[0082] It should be noted that, in the specific example of the cylindrical battery 1000, the tab welding area 110 is first smoothed, that is, the tab welding area 110 is smoothed from the outside to the inside in the radial direction of the pole core 100. In the process of smoothing the tab welding area 110, as shown in FIG. Figure 8 As shown, the plurality of tabs 120 in the tab welding area 110 are bent inwards. After being bent, as shown in FIG. Figure 2 As shown, the collecting plate 200 is arranged at the end of the tab welding area 110. At this time, the thickness of the tab welding area 110 corresponding to the outer ring area 210 gradually becomes thicker from the outside to the inside, the thickness of the tab welding area 110 corresponding to the inner ring area 230 gradually becomes thinner from the outside to the inside, and the thickness of the tab welding area 110 corresponding to the middle ring area 220 is the same from the outside to the inside. Then, the collecting plate 200 and the tab welding area 110 are welded, and the first weld mark 241 in the middle ring area 220 is controlled to extend along the radial direction of the pole core 100, and the second weld mark 242 in at least one of the inner ring area 230 and the outer ring area 210 is controlled to extend along the circumferential direction of the pole core 100, so that the thickness of the tab welding area 110 welded by the first weld mark 241 and the second weld mark 242 is the same, avoiding the phenomenon of cold welding or over welding of the first weld mark 241 and the second weld mark 242.

[0083] It should also be noted that in order to ensure that the current collecting plate 200 and the tab welding area 110 of different thicknesses can be welded together, during the specific welding process between the current collecting plate 200 and the tab welding area 110, the current collecting plate 200 needs to be pressed toward the tab welding area 110, such as Figure 4As shown, at this time, the pole piece facing the thicker tab welding area 110 will bend and deform to ensure that the current collecting plate 200 and the tab welding areas 110 of different thicknesses can form a welding connection, thereby ensuring the connection area between the current collecting plate 200 and the tab welding area 110 to a certain extent, and improving the current flow capacity of the current collecting plate 200.

[0084] In some embodiments, the thickness of the tab welding region 110 facing the center ring region 220 is approximately 0.11 mm. When the tab welding region 110 facing the center ring region 220 is thin, the first weld mark 241 is likely to penetrate the tab welding region 110, which can easily cause burns to the diaphragm and reduce the welding quality between the current collecting plate 200 and the tab welding region 110. When the tab welding region 110 is thick, the welding quality between the first weld mark 241 and the tab welding region 110 is affected, thereby affecting the current flow capacity of the current collecting plate 200.

[0085] Therefore, the thickness of the tab welding area 110 facing the middle ring area 220 is set to about 0.11 mm in this application to ensure the welding effect between the current collecting plate 200 and the tab welding area 110 and improve the current flow capacity of the current collecting plate 200 .

[0086] In a specific example, multiple tabs 120 are bent inward to define the tab welding area 110. The number of tabs 120 facing the center ring area 220 can be set to about 13, so that the thickness of the tab welding area 110 facing the center ring area 220 can be about 0.11 mm, so as to ensure the welding effect between the collecting plate 200 and the tab welding area 110.

[0087] Of course, in some other embodiments, the thickness of the tab welding area 110 facing the middle ring area 220 and the number of tabs 120 can also be limited according to the specific structure of the cylindrical battery 1000, and during the welding process between the collecting plate 200 and the tab welding area 110, the welding power is limited according to actual conditions to ensure the welding effect between the collecting plate 200 and the tab welding area 110.

[0088] In some embodiments, as Figure 1As shown, the collecting plate 200 includes a first connecting portion 250 and a second connecting portion 260 that are interconnected. The second connecting portion 260 is used for electrical connection of the pole of the cylindrical battery 1000 (not shown in the figure). The first connecting portion 250 is provided with an outer ring area 210, a middle ring area 220 and an inner ring area 230. The middle ring area 220 is provided with a first weld mark 241, and at least one of the inner ring area 230 and the outer ring area 210 is provided with a second weld mark 242, so as to facilitate the welding connection between the first connecting portion 250 and the tab welding area 110, thereby realizing the electrical connection between the pole core 100 and the pole, ensuring the working performance of the cylindrical battery 1000, and the above-mentioned arrangement can also ensure the connection quality between the collecting plate 200 and the pole core 100.

[0089] In some embodiments, combined Figure 2 、 Figure 4 and Figure 8 As shown, in the radial direction of the pole core 100, the pole core 100 includes a plurality of pole tabs 120, and the plurality of pole tabs 120 are bent inward to define a pole tab welding area 110, and the bending length of each pole tab 120 is L1 (for details, see Figure 2 and Figure 3 ), the radial dimension of the inner ring area 230 is H1, the radial dimension of the outer ring area 210 is H2, and the cylindrical battery 1000 satisfies: 0.8L1≤H1≤1.3L1, and / or, 0.8L1≤H2≤1.3L1. The bending length of the tab 120 mentioned here can be understood as the length of each tab 120 in the tab welding area 110 after bending, that is, the length of the tab 120 extending from the outside to the inside in the radial direction of the pole core 100, that is, Figure 2 and Figure 3 As shown in FIG, when the cylindrical battery 1000 is set to satisfy: 0.8L1≤H1≤1.3L1, and / or, 0.8L1≤H2≤1.3L1, it is ensured that the thickness of the tab welding area 110 corresponding to the inner ring area 230 gradually becomes thinner from the outside to the inside, the thickness of the tab welding area 110 corresponding to the outer ring area 210 gradually becomes thicker from the outside to the inside, and the thickness of the tab welding area 110 corresponding to the middle ring area 220 is the same from the outside to the inside, so that when the inner ring area 220 When a first weld mark 241 extending in the radial direction of the pole core 100 is provided inside and a second weld mark 242 extending in the circumferential direction of the pole core 100 is provided in at least one of the inner ring area 230 and the outer ring area 210, it can be ensured that the thickness of the tab welding area 110 welded by the first weld mark 241 and the second weld mark 242 is the same, avoiding the phenomenon of cold welding or over welding of the first weld mark 241 and the second weld mark 242, thereby ensuring the welding quality of the collecting plate 200 and the tab welding area 110 to a certain extent, and improving the working performance of the cylindrical battery 1000.

[0090] That is to say, through the above-mentioned setting, it can be ensured that the area where the thickness of the tab welding area 110 gradually becomes thinner from the outside to the inside belongs to the inner ring welding area, the area where the thickness of the tab welding area 110 gradually becomes thicker from the outside to the inside belongs to the outer ring welding area, the middle ring welding area is located between the inner ring welding area and the outer ring welding area, and the stacking thickness of multiple tabs 120 in the middle ring welding area is consistent.

[0091] It should be noted that the radial width of the middle ring area 220 is mainly determined by the diameter of the cylindrical battery 1000, wherein the radial width of the middle ring area 220 is equal to the radius of the pole core 100 minus the radius of the winding hole and the radial width of the inner ring area 230 and the radial width of the outer ring area 210.

[0092] In some embodiments, as Figure 2 As shown, the pole piece near the radial inner side of the pole core 100 is not provided with a pole tab 120. Since the pole tab welding area 110 is formed by bending a plurality of pole tabs 120 inward, when the pole tab 120 is provided in the radial inner area of ​​the pole core 100, after the pole tab 120 is bent, the pole tab welding area 110 is prone to block the winding hole of the cylindrical battery 1000, affecting the liquid injection effect and the exhaust effect of the cylindrical battery 1000, thereby reducing the performance and safety of the cylindrical battery 1000. The present application ensures that the pole tab welding area 110 can effectively avoid the winding hole of the cylindrical battery 1000 through the above-mentioned setting, so as to improve the performance and safety of the cylindrical battery 1000.

[0093] Of course, in some other examples, a pole tab 120 (not shown in this example figure) can also be provided on the pole piece near the radial inner side of the pole core 100. After the pole tab 120 is bent inward or before the pole tab 120 is bent, the pole tab 120 is trimmed to ensure that the pole tab welding area 110 can avoid the winding hole of the cylindrical battery 1000, which can also improve the performance and safety of the cylindrical battery 1000.

[0094] In some embodiments, combined Figure 1 and Figure 5As shown, a second weld mark 242 is provided in the outer ring area 210 . In the radial direction parallel to the pole core 100 , there is a distance H3 between the outermost second weld mark 242 in the outer ring area 210 and the outer peripheral wall of the pole core 100 . That is to say, when the second weld mark 242 is set in the outer ring area 210, the outermost second weld mark 242 in the outer ring area 210 is spaced apart from the outer peripheral wall of the pole core 100. Since the thickness of the tab welding area 110 corresponding to the outer ring area 210 gradually becomes thicker from the outside to the inside, the thickness of the tab welding area 110 close to the outer peripheral wall of the pole core 100 is thinner. When the outermost second weld mark 242 in the outer ring area 210 is closer to the outer peripheral wall of the pole core 100, the thickness of the tab welding area 110 facing the second weld mark 242 is thinner. At this time, when the second weld mark 242 is used to weld the collecting plate 200 and the tab welding area 110, the second weld mark 242 is likely to penetrate the tab welding area 110, and it is easy to cause burns to the diaphragm, thereby reducing the performance of the cylindrical battery 1000.

[0095] Therefore, the present application sets the outermost second weld mark 242 in the outer ring area 210 to be spaced apart from the outer peripheral wall of the pole core 100 to prevent the second weld mark 242 from penetrating the tab welding area 110 and ensure the welding effect.

[0096] In some embodiments, the spacing H3 is ≥ 2 mm to ensure that the outermost second weld bead 242 in the outer ring region 210 is aligned with the thickness of the tab welding region 110 , thereby preventing the second weld bead 242 in the outer ring region 210 from penetrating the tab welding region 110 and ensuring a good welding effect.

[0097] In some embodiments, combined Figure 1 and Figure 5 As shown, the outer ring region 210 is provided with a plurality of second weld lines 242 spaced apart along the radial direction of the pole core 100. In other words, the outer ring region 210 is provided with a plurality of second weld lines 242, which are spaced apart along the radial direction of the pole core 100. The plurality of second weld lines 242 cooperate to increase the connection area between the outer ring region 210 and the tab welding region 110. This improves the flow capacity of the current collecting plate 200 while ensuring the connection strength between the outer ring region 210 and the tab welding region 110, thereby stabilizing the relative position of the outer ring region 210 and the tab welding region 110 and ensuring the working performance of the current collecting plate 200.

[0098] At the same time, by arranging the multiple second weld marks 242 in the outer ring area 210 to be spaced apart along the radial direction of the pole core 100, the contact of the multiple second weld marks 242 in the outer ring area 210 can be avoided. Because in the radial direction of the pole core 100, the thickness of the tab welding area 110 facing the outer ring area 210 is different, if the multiple second weld marks 242 in the outer ring area 210 are in contact, it will cause over-welding in the thinner tab welding area 110, which may easily cause burns to the diaphragm. Therefore, by arranging the multiple second weld marks 242 in the outer ring area 210 along the radial direction of the pole core 100, over-welding can be avoided to a certain extent, thereby improving the working performance of the cylindrical battery 1000.

[0099] In some embodiments, as Figure 5 As shown, the distance H5 between two adjacent second weld lines 242 in the outer ring region 210 is 0.3 mm to 1.5 mm. When the distance between two adjacent second weld lines 242 in the outer ring region 210 is small, the two adjacent second weld lines 242 in the outer ring region 210 are prone to contact, which can easily cause over-welding of the thinner tab welding area 110. When the distance between two adjacent second weld lines 242 in the outer ring region 210 is large, it is impossible to provide a large number of second weld lines 242 in the outer ring region 210, thereby affecting the flow capacity of the current collecting plate 200.

[0100] Therefore, the present application sets the distance between two adjacent second weld lines 242 in the outer ring area 210 to 0.3 mm-1.5 mm. While avoiding contact between two adjacent second weld lines 242 in the outer ring area 210, it is also convenient to set a larger number of second weld lines 242 in the outer ring area 210, thereby improving the flow capacity of the collecting plate 200.

[0101] In a specific example, the distance between two adjacent second weld lines 242 in the outer ring area 210 is 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, or 1.5 mm, etc.

[0102] In some embodiments, as Figure 5 As shown, 2 to 4 second weld lines 242 are provided in the outer ring area 210 and are spaced apart radially along the pole core 100 to increase the connection area between the outer ring area 210 and the tab welding area 110, thereby improving the flow capacity of the collecting plate 200 and ensuring the connection strength between the outer ring area 210 and the tab welding area 110.

[0103] In some embodiments, the width of the outermost second weld mark 242 in the outer ring region 210 is smaller than the width of the innermost second weld mark 242 in the outer ring region 210. In other words, the widths of the plurality of second weld marks 242 in the outer ring region 210 are different. It should be noted that the wider the width of the second weld mark 242, the larger the welding area between the outer ring region 210 and the tab welding region 110, and the deeper the welding depth.

[0104] Among them, because the thickness of the tab welding area 110 corresponding to the outer ring area 210 is different in the direction from the outside to the inside, and the tab welding area 110 close to the outside of the outer ring area 210 is thinner, and the tab welding area 110 close to the inside of the outer ring area 210 is thicker, when the width of the second weld mark 242 located on the outermost side in the outer ring area 210 is set to the same as the width of the second weld mark 242 located on the innermost side in the outer ring area 210, it is easy to cause over-welding between the area close to the outer side of the outer ring area 210 and the tab welding area 110 or cause cold welding between the area close to the inner side of the outer ring area 210 and the tab welding area 110, affecting the welding effect between the outer ring area 210 and the tab welding area 110.

[0105] Therefore, the present application sets the width of the second weld mark 242 welded to the thinner tab welding area 110 in the outer ring area 210 to be smaller than the width of the second weld mark 242 welded to the thicker tab welding area 110, which can ensure the welding effect of the outer ring area 210 and the tab welding area 110 and avoid the occurrence of cold welding or over-welding.

[0106] in, Figure 5 、 Figure 9 、 Figure 10 and Figure 11 Multiple second weld marks 242 are shown in the outer ring area 210 respectively, and it is shown that in the outer ring area 210, the line thickness of the second weld mark 242 located on the outermost side and the second weld mark 242 located on the innermost side are different, so as to indicate that the width of the second weld mark 242 located on the outermost side in the outer ring area 210 is smaller than the width of the second weld mark 242 located on the innermost side in the outer ring area 210, which is easy to understand.

[0107] In some embodiments, at least one second weld mark 242 is provided in the outer ring region 210, and the radial width of each second weld mark 242 in the outer ring region 210 is ≤ 0.5 mm. This means that one or more second weld marks 242 may be provided in the outer ring region 210 to facilitate the weld connection between the outer ring region 210 and the tab welding region 110.

[0108] At the same time, since the thickness of the tab welding area 110 directly opposite the outer ring area 210 is different in the radial direction of the pole core 100, by setting the radial width of the second weld mark 242 in the outer ring area 210 to less than or equal to 0.5 mm, it is possible to avoid large differences in the thickness of the tab welding area 110 welded by the same second weld mark 242 in the outer ring area 210, thereby avoiding to a certain extent the over-welding of the thinner tab welding area 110 during welding with the same power and causing burns to the diaphragm, so as to ensure the performance of the pole core 100.

[0109] In a specific example, the radial width of the second weld bead 242 in the outer ring region 210 is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm.

[0110] In some embodiments, the second weld bead 242 in the outer ring region 210 is formed in an arc shape, a straight line shape, or a wavy shape. Here, the shape of the second weld bead 242 in the outer ring region 210 can be formed in one of the arc shape, the straight line shape, or the wavy shape to reduce the difficulty of forming the second weld bead 242 in the outer ring region 210.

[0111] Of course, in some other embodiments, the shape of the second weld mark 242 in the outer ring area 210 can also be formed as a combination of at least two of an arc shape, a straight line shape, and a wave shape.

[0112] It should be noted that when the second weld mark 242 in the outer ring area 210 is formed into a wavy shape, the difference in the upper and lower waveform sizes of the wavy pattern is within 0.5 mm, so that the radial width of the second weld mark 242 in the outer ring area 210 can be within 0.5 mm, thereby avoiding a large difference in the thickness of the tab welding area 110 welded by the same second weld mark 242 in the outer ring area 210.

[0113] In some embodiments, the second weld mark 242 in the outer ring area 210 is formed into an arc shape. This reduces the difficulty of forming the second weld mark 242 in the outer ring area 210 while facilitating the control of the second weld mark 242 in the outer ring area 210 to extend along the circumferential direction of the pole core 100, thereby ensuring that the thickness of the tab welding area 110 welded by the second weld mark 242 in the outer ring area 210 is the same, avoiding the occurrence of cold welding or over-welding, and improving the working performance of the cylindrical battery 1000.

[0114] In some embodiments, combined Figure 1 and Figure 5As shown, the inner ring region 230 is provided with a plurality of second weld lines 242 spaced apart along the radial direction of the pole core 100. This means that the inner ring region 230 is provided with a plurality of second weld lines 242, which are spaced apart along the radial direction of the pole core 100. The plurality of second weld lines 242 cooperate to increase the connection area between the inner ring region 230 and the tab welding region 110, thereby improving the flow capacity of the current collecting plate 200 and ensuring the connection strength between the inner ring region 230 and the tab welding region 110.

[0115] At the same time, by arranging the multiple second weld marks 242 in the inner ring area 230 to be spaced apart along the radial direction of the pole core 100, contact between the multiple second weld marks 242 in the inner ring area 230 can be avoided. Because in the radial direction of the pole core 100, the thickness of the tab welding area 110 facing the inner ring area 230 is different, if the multiple second weld marks 242 in the inner ring area 230 are in contact, it will cause over-welding in the thinner tab welding area 110, which can easily cause diaphragm burns. Therefore, by arranging the multiple second weld marks 242 in the inner ring area 230 along the radial direction of the pole core 100, diaphragm burns can be avoided to a certain extent, and the working performance of the cylindrical battery 1000 can be improved.

[0116] In some embodiments, as Figure 5 As shown, the inner ring area 230 is provided with 2 to 4 second weld lines 242 arranged at radial intervals along the pole core 100 to increase the connection area between the inner ring area 230 and the tab welding area 110, thereby improving the flow capacity of the collecting plate 200 and ensuring the connection strength between the inner ring area 230 and the tab welding area 110.

[0117] In some embodiments, the width of the outermost second weld mark 242 within the inner ring area 230 is greater than the width of the innermost second weld mark 242 within the inner ring area 230, that is, the widths of the multiple second weld marks 242 within the inner ring area 230 are different. It should be noted that the wider the width of the second weld mark 242, the larger the welding area between the inner ring area 230 and the tab welding area 110, and the deeper the welding depth.

[0118] Among them, because the thickness of the tab welding area 110 corresponding to the inner ring area 230 is different in the direction from the outside to the inside, and the tab welding area 110 close to the outside of the inner ring area 230 is thicker, and the tab welding area 110 close to the inside of the inner ring area 230 is thinner, when the width of the second weld mark 242 located on the outermost side within the inner ring area 230 is set to the same as the width of the second weld mark 242 located on the innermost side within the inner ring area 230, it is easy to cause over-welding between the area close to the inner side of the inner ring area 230 and the tab welding area 110 or cause cold welding between the area close to the outer side of the inner ring area 230 and the tab welding area 110, affecting the welding effect between the inner ring area 230 and the tab welding area 110.

[0119] Therefore, the present application sets the width of the second weld mark 242 welded to the thicker tab welding area 110 in the inner ring area 230 to be larger than the width of the second weld mark 242 welded to the thinner tab welding area 110, which can ensure the welding effect of the inner ring area 230 and the tab welding area 110 and avoid the occurrence of cold welding or over-welding.

[0120] in, Figure 5 、 Figure 9 、 Figure 10 and Figure 11 Multiple second weld marks 242 are shown in the inner ring area 230 respectively, and it is shown that in the inner ring area 230, the line thickness of the outermost second weld mark 242 and the innermost second weld mark 242 are different, so as to indicate that the width of the outermost second weld mark 242 in the inner ring area 230 is greater than the width of the innermost second weld mark 242 in the inner ring area 230, which is easy to understand.

[0121] In some embodiments, the spacing between radially adjacent second weld lines 242 in the inner ring region 230 ranges from 0.3 mm to 1.5 mm. Figure 5 As shown in H6, when the distance H6 between two adjacent second weld lines 242 in the inner ring area 230 is small, the two adjacent second weld lines 242 in the inner ring area 230 are prone to contact, which can easily cause over-welding of the thinner tab welding area 110; when the distance H6 between two adjacent second weld lines 242 in the inner ring area 230 is large, a larger number of second weld lines 242 cannot be set in the inner ring area 230, thereby affecting the flow capacity of the collecting plate 200.

[0122] Therefore, the present application sets the distance between two adjacent second weld marks 242 in the inner ring area 230 to 0.3mm-1.5mm. While avoiding contact between two adjacent second weld marks 242 in the inner ring area 230, it is also convenient to set a larger number of second weld marks 242 in the inner ring area 230, thereby improving the flow capacity of the collecting plate 200.

[0123] In a specific example, the distance between two adjacent second weld lines 242 in the inner ring area 230 is 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, or 1.5 mm.

[0124] In some embodiments, combined Figure 5 、 Figure 6 and Figure 7 As shown, in the radial direction of the parallel pole core 100, there is a spacing H4 between the innermost second weld mark 242 in the inner ring region 230 and the inner edge of the tab welding region 110, and the innermost second weld mark 242 in the inner ring region 230 is located radially outward of the inner edge of the tab welding region 110. The inner edge of the tab welding region 110 mentioned here can be understood as the innermost side of the tab welding region 110 in the radial direction of the parallel pole core 100 and in the direction from outside to inside, that is, the side of the tab welding region 110 surrounding the outer circumference of the winding hole of the cylindrical battery 1000.

[0125] It should be noted that since the thickness of the tab welding area 110 corresponding to the inner ring area 230 gradually becomes thinner from the outside to the inside, the thickness of the tab welding area 110 close to the inner edge of the tab welding area 110 is thinner. When the second weld mark 242 located on the innermost side of the inner ring area 230 is close to the inner edge of the tab welding area 110, the thickness of the tab welding area 110 facing the second weld mark 242 will be thinner. At this time, when the second weld mark 242 is used to weld the collecting plate 200 and the tab welding area 110, it is easy for the second weld mark 242 to penetrate the tab welding area 110, which can easily cause burns to the diaphragm and reduce the performance of the cylindrical battery 1000.

[0126] Therefore, the present application arranges the innermost second weld mark 242 within the inner ring area 230 radially outward of the inner edge of the tab welding area 110 and spaced apart from the inner edge of the tab welding area 110. While ensuring that the second weld mark 242 within the inner ring area 230 can effectively realize the welding connection between the collecting plate 200 and the tab welding area 110, it can also avoid the second weld mark 242 penetrating the tab welding area 110 to a certain extent, thereby ensuring the welding effect.

[0127] In some embodiments, the spacing H4 is ≥ 2 mm to ensure that the innermost second weld bead 242 in the inner ring region 230 is aligned with the thickness of the tab welding region 110 , thereby preventing the second weld bead 242 in the inner ring region 230 from penetrating the tab welding region 110 and ensuring a good welding effect.

[0128] In some embodiments, at least one second weld mark 242 is provided in the inner ring region 230, and the radial width of each second weld mark 242 in the inner ring region 230 is ≤0.5 mm. This means that one second weld mark 242 or multiple second weld marks 242 can be provided in the inner ring region 230, but the radial width of each second weld mark 242 is less than or equal to 0.5 mm. Because the thickness of the tab welding area 110 facing the inner ring region 230 in the radial direction of the pole core 100 is also different, by setting the radial width of the second weld mark 242 in the inner ring region 230 to be less than or equal to 0.5 mm, it is possible to avoid a large difference in the thickness of the tab welding area 110 welded by the same second weld mark 242 in the inner ring region 230, thereby preventing the thinner tab welding area 110 from being over-welded when welding with the same power, thereby preventing burns to the diaphragm, thereby ensuring the performance of the pole core 100.

[0129] In a specific example, the radial width of the second weld bead 242 in the inner annular region 230 is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm.

[0130] In some embodiments, the second weld bead 242 in the inner ring region 230 is formed in an arc shape, a straight line shape, or a wavy shape. Here, the second weld bead 242 in the inner ring region 230 can be formed in one of the arc shape, the straight line shape, or the wavy shape to reduce the difficulty of forming the second weld bead 242 in the inner ring region 230.

[0131] Of course, in some other embodiments, the shape of the second weld mark 242 in the inner ring area 230 can also be formed as a combination of at least two of an arc shape, a straight line shape, and a wave shape.

[0132] It should be noted that when the second weld mark 242 in the inner ring area 230 is formed into a wavy shape, the difference in the upper and lower waveform sizes of the wavy pattern is within 0.5 mm, so that the radial width of the second weld mark 242 in the inner ring area 230 can be within 0.5 mm, thereby avoiding a large difference in the thickness of the tab welding area 110 welded by the same second weld mark 242 in the inner ring area 230.

[0133] In some embodiments, as Figure 5As shown, the second weld mark 242 in the inner ring area 230 is formed into an arc shape. This reduces the difficulty of forming the second weld mark 242 in the inner ring area 230, and can also facilitate the control of the second weld mark 242 in the inner ring area 230 to extend along the circumferential direction of the pole core 100, thereby ensuring that the thickness of the tab welding area 110 welded by the second weld mark 242 in the inner ring area 230 is the same, avoiding the phenomenon of cold welding or over-welding, and improving the working performance of the cylindrical battery 1000.

[0134] In some embodiments, as Figure 1 and Figure 5 As shown, the first weld line 241 is formed as a continuously extending weld line. Here, the first weld line 241 in the middle ring area 220 extends continuously along the radial direction of the pole core 100. This can reduce the difficulty of forming the first weld line 241, thereby improving the welding efficiency between the current collecting plate 200 and the tab welding area 110.

[0135] In some embodiments, as Figure 5 As shown, the first weld mark 241 is formed as a straight line to further reduce the difficulty of forming the first weld mark 241.

[0136] Of course, in some other embodiments, the first weld mark 241 can also be formed as a weld mark of any single pattern, such as an arc pattern, a wave pattern, a broken line pattern, etc.

[0137] Alternatively, as Figure 9 As shown, the first weld line 241 includes a plurality of sub-weld lines 2411 spaced apart in the radial direction of the pole core 100. That is, the first weld line 241 is not limited to being a weld line continuously extending in the radial direction of the pole core 100. The first weld line 241 can also be configured to include a plurality of sub-weld lines 2411 spaced apart in the radial direction of the pole core 100. In this way, the first weld line 241 can also be used to achieve a welded connection between the current collecting plate 200 and the tab welding area 110.

[0138] In some embodiments, in the radial direction of the pole core 100, the spacing between two adjacent sub-weld lines 2411 is less than 2 mm to ensure the welding area between the first weld line 241 and the tab welding area 110, thereby ensuring the welding area between the collecting plate 200 and the tab welding area 110, improving the relative position stability between the collecting plate 200 and the tab welding area 110, and ensuring the flow capacity of the collecting plate 200.

[0139] In some embodiments, combined Figure 5 、 Figure 9 、 Figure 10 and Figure 11As shown, the current collecting disc 200 is provided with multiple weld line groups 240 along the circumference of the electrode core 100. The multiple weld line groups 240 are spaced apart along the circumference, and each weld line group 240 includes a first weld line 241 and a second weld line 242. In this way, the multiple weld line groups 240 can be used to increase the connection area between the current collecting disc 200 and the tab welding area 110, thereby improving the current flow capacity of the current collecting disc 200 while ensuring the connection strength between the current collecting disc 200 and the tab welding area 110. This ensures that the relative position of the current collecting disc 200 and the tab welding area 110 is stable, thereby ensuring the operating performance of the current collecting disc 200.

[0140] In some embodiments, combined Figure 5 、 Figure 9 、 Figure 10 and Figure 11 As shown, each weld mark group 240 includes at least one first weld mark group 243, and each first weld mark group 243 includes a plurality of first weld marks 241 spaced apart along the circumference of the pole core 100. In other words, a plurality of first weld marks 241 are provided in the middle ring region 220, and the plurality of first weld marks 241 are spaced apart along the circumference of the pole core 100. The plurality of first weld marks 241 cooperate to increase the connection area between the middle ring region 220 and the tab welding region 110, thereby further improving the flow capacity of the current collecting plate 200 and ensuring the relative position stability of the middle ring region 220 and the tab welding region 110.

[0141] In some embodiments, as Figure 9 As shown, when the first weld line 241 includes multiple sub-weld lines 2411, an interval space is formed between two adjacent sub-weld lines 2411 in the radial direction of the pole core 100. When each group of first weld line groups 243 includes multiple first weld lines 241 arranged at intervals along the circumference of the pole core 100, two adjacent interval spaces are staggered in the circumference of the pole core 100, that is, two adjacent interval spaces are not arranged opposite each other in the circumference of the pole core 100. This ensures that the multiple first weld lines 241 in the middle ring area 220 can be simultaneously welded with the pole tab welding area 110 facing the middle ring area 220, avoiding the phenomenon of partial leakage of the pole tab welding area 110 facing the middle ring area 220 in the radial direction of the pole core 100, thereby ensuring the welding effect of the middle ring area 220 and the pole tab welding area 110.

[0142] In some embodiments, combined Figure 5 、 Figure 9 、 Figure 10 and Figure 11As shown, each group of first weld lines 243 includes multiple first weld lines 241 arranged in parallel, that is, the multiple first weld lines 241 of each group of first weld lines 243 are arranged in parallel. In this way, while ensuring that each first weld line 241 can be welded to the tab welding area 110 facing the middle ring area 220, the difficulty of forming the multiple first weld lines 241 can be reduced, thereby reducing the difficulty of welding the middle ring area 220 and the tab welding area 110.

[0143] In some embodiments, at least a portion of the first weld lines 241 in each first weld line group 243 are arranged in a cross-arranged manner. When there are multiple intersections, the spacing between adjacent intersections is greater than 2 mm (not shown in this example figure). In other words, it is not limited to arranging multiple first weld lines 241 in each weld line group 240 in parallel. At least a portion of the first weld lines 241 in each weld line group 240 can also be arranged in a cross-arranged manner. When two first weld lines 241 simultaneously intersect with the same first weld line 241, there will be multiple intersections. Setting the spacing between two adjacent intersections to greater than 2 mm can avoid overlapping of the two adjacent intersections, thereby preventing overheating due to heat superposition and ensuring the stability of the welding process between the middle ring area 220 and the tab welding area 110.

[0144] That is to say, by setting the spacing between adjacent intersections to be greater than 2 mm, the present application can effectively solve the risk of burning the diaphragm caused by local heat superposition or heat conduction during welding, thereby improving the stability of the welding process.

[0145] In some embodiments, as Figure 9 and Figure 10 As shown, each weld line group 240 includes multiple first weld line groups 243 spaced apart along the circumference of the pole core 100. Each first weld line group 243 includes multiple first weld lines 241 spaced apart along the circumference of the pole core 100. Second weld lines 242 are provided radially inwardly and radially outwardly of each first weld line group 243. Here, each weld line group 240 includes multiple first weld line groups 243 spaced apart along the circumference of the pole core 100, and each first weld line group 243 includes multiple first weld lines 241 spaced apart along the circumference of the pole core 100. This maximizes the number of first weld lines 241, thereby ensuring the connection area between the middle ring region 220 and the tab welding region 110, improving the flow capacity of the current collecting plate 200, and stabilizing the relative position between the current collecting plate 200 and the tab welding region 110, thereby ensuring the operating performance of the current collecting plate 200.

[0146] At the same time, by arranging the second weld mark 242 on the radial inner side and the radial outer side of each group of first weld mark groups 243, while ensuring that the second weld mark 242 is provided in the outer ring area 210 and the inner ring area 230 of the collecting plate 200, the coverage area of ​​the second weld mark 242 can also be guaranteed, thereby further increasing the connection area between the collecting plate 200 and the tab welding area 110, thereby facilitating the improvement of the flow capacity of the collecting plate 200.

[0147] In some embodiments, as Figure 10 As shown, the second weld lines 242 located radially inside the two groups of first weld line groups 243 are formed as the same weld line, that is, the second weld line 242 located radially inside one of the first weld line groups 243 also extends toward the other first weld line group 243, so that the second weld line 242 can also be located radially inside the other first weld line group 243, thereby reducing the difficulty of forming the second weld line 242 located radially inside the first weld line group 243, thereby reducing the difficulty of welding the collecting plate 200 and the tab welding area 110.

[0148] Accordingly, if Figure 10 As shown, the second weld lines 242 located radially outside the two groups of first weld line groups 243 can be formed as the same weld line, that is, the second weld line 242 located radially outside one of the first weld line groups 243 also extends toward the other first weld line group 243, so that the second weld line 242 can also be located radially outside the other first weld line group 243, thereby reducing the difficulty of forming the second weld line 242 located radially outside the first weld line group 243, thereby reducing the difficulty of welding the collecting plate 200 and the tab welding area 110.

[0149] Of course, in some other embodiments, the structure of the second weld lines 242 located radially outward of the two first weld line groups 243 may also be reasonably arranged according to the shape of the collecting plate 200, such as Figure 5 As shown, the second weld lines 242 located radially outside the two first weld line groups 243 are independent of each other; and / or, the second weld lines 242 located radially inside the two first weld line groups 243 are independent of each other (this example is not shown).

[0150] In some embodiments, as Figure 5As shown, each weld mark group 240 includes multiple outer ring second weld mark groups 244, which are arranged corresponding to the multiple first weld mark groups 243. The multiple outer ring second weld mark groups 244 are arranged in the outer ring area 210 and are located radially outward of the first weld mark groups 243. Each outer ring second weld mark group 244 includes multiple second weld marks 242 spaced apart along the radial direction of the pole core 100. This allows the second weld marks 242 to be arranged within the outer ring area 210 of the current collecting plate 200. At the same time, the multiple outer ring second weld mark groups 244 can also ensure the coverage area of ​​the second weld marks 242, thereby increasing the connection area between the current collecting plate 200 and the tab welding area 110, thereby facilitating the improvement of the current flow capacity of the current collecting plate 200.

[0151] In some embodiments, as Figure 5 As shown, the number of multiple groups of outer ring second weld mark groups 244 corresponds to the number of multiple groups of first weld mark groups 243, that is, when there are two groups of first weld mark groups 243, there are also two groups of outer ring second weld mark groups 244; when there are three groups of first weld mark groups 243, there are also three groups of outer ring second weld mark groups 244, so that multiple groups of outer ring second weld mark groups 244 correspond one-to-one with multiple groups of first weld mark groups 243, so that the radial outer side of each group of first weld mark groups 243 is provided with an outer ring second weld mark group 244, ensuring the coverage area of ​​the second weld mark 242, and then ensuring the connection area between the collecting plate 200 and the tab welding area 110.

[0152] In some embodiments, each weld mark group 240 includes multiple inner ring second weld mark groups 245, which are arranged corresponding to the multiple first weld mark groups 243 (not shown in this example figure). The multiple inner ring second weld mark groups 245 are arranged in the inner ring area 230 and radially inward of the first weld mark groups 243. Each inner ring second weld mark group 245 includes multiple second weld marks 242 spaced apart along the radial direction of the pole core 100. This allows the second weld marks 242 to be arranged in the inner ring area 230 of the current collecting plate 200. At the same time, the multiple inner ring second weld mark groups 245 can also ensure the coverage area of ​​the second weld marks 242, thereby increasing the connection area between the current collecting plate 200 and the tab welding area 110, thereby facilitating the improvement of the current flow capacity of the current collecting plate 200.

[0153] In some embodiments, the number of multiple groups of inner ring second weld mark groups 245 corresponds to the number of multiple groups of first weld mark groups 243, that is, when there are two groups of first weld mark groups 243, the number of inner ring second weld mark groups 245 is also two groups; when there are three groups of first weld mark groups 243, the number of inner ring second weld mark groups 245 is also three groups, so that multiple groups of inner ring second weld mark groups 245 correspond one-to-one with multiple groups of first weld mark groups 243, so that the radial inner side of each group of first weld mark groups 243 is provided with an inner ring second weld mark group 245, ensuring the coverage area of ​​the second weld mark 242, and then ensuring the connection area between the collecting plate 200 and the tab welding area 110.

[0154] In a specific example, each group of weld mark groups 240 includes multiple groups of outer ring second weld mark groups 244 and multiple groups of inner ring second weld mark groups 245. The multiple groups of outer ring second weld mark groups 244 and the multiple groups of inner ring second weld mark groups 245 are arranged corresponding to the multiple groups of first weld mark groups 243. The multiple groups of outer ring second weld mark groups 244 are arranged in the outer ring area 210 and are located radially outside the first weld mark group 243. Each group of outer ring second weld mark groups 244 includes multiple second weld marks 242 arranged at radial intervals along the pole core 100. The multiple groups of inner ring second weld mark groups 245 are arranged in the inner ring area 230 and are located radially inside the first weld mark group 243. Each group of inner ring second weld mark groups 245 includes multiple second weld marks 242 arranged at radial intervals along the pole core 100. As a result, multiple second weld lines 242 are provided in the outer ring area 210 and the inner ring area 230 of the collecting plate 200, and the coverage area of ​​the second weld lines 242 is ensured, thereby increasing the connection area between the collecting plate 200 and the tab welding area 110, thereby facilitating the improvement of the current flow capacity of the collecting plate 200.

[0155] In some embodiments, as Figure 5 As shown, each group of weld mark groups 240 includes multiple groups of outer ring second weld mark groups 244 and one group of inner ring second weld mark groups 245. The multiple groups of outer ring second weld mark groups 244 are arranged corresponding to the multiple groups of first weld mark groups 243. The multiple groups of outer ring second weld mark groups 244 are arranged in the outer ring area 210 and are located radially outside the first weld mark group 243. Each group of outer ring second weld mark groups 244 includes multiple second weld marks 242 arranged at radial intervals along the pole core 100. The inner ring second weld mark group 245 is arranged in the inner ring area 230 and is located radially inside the multiple groups of first weld mark groups 243. The inner ring second weld mark group 245 includes multiple second weld marks 242 arranged at radial intervals along the pole core 100. That is to say, it is not limited to setting each weld mark group 240 to include multiple groups of outer ring second weld mark groups 244 and multiple groups of inner ring second weld mark groups 245. Each weld mark group 240 can also be set to include multiple groups of outer ring second weld mark groups 244 and one group of inner ring second weld mark groups 245, and one group of inner ring second weld mark groups 245 is simultaneously located radially inside the multiple groups of first weld mark groups 243. In this way, while multiple second weld marks 242 are provided in the outer ring area 210 and the inner ring area 230 of the collecting plate 200 to ensure the coverage area of ​​the second weld marks 242, the difficulty of forming the second weld marks 242 located radially inside the first weld mark group 243 can also be reduced, thereby reducing the difficulty of welding the collecting plate 200 to the tab welding area 110.

[0156] In other embodiments, Figure 10As shown, each group of weld mark groups 240 includes a group of outer ring second weld mark groups 244 and a group of inner ring second weld mark groups 245. The outer ring second weld mark group 244 is arranged in the outer ring area 210 and is located radially outside the multiple groups of first weld mark groups 243. The outer ring second weld mark group 244 includes a plurality of second weld marks 242 arranged at radial intervals along the pole core 100. The inner ring second weld mark group 245 is arranged in the inner ring area 230 and is located radially inside the multiple groups of first weld mark groups 243. The inner ring second weld mark group 245 includes a plurality of second weld marks 242 arranged at radial intervals along the pole core 100. That is to say, it is not limited to setting each weld mark group 240 to include multiple groups of outer ring second weld mark groups 244 and multiple groups of inner ring second weld mark groups 245, nor is it limited to setting each weld mark group 240 to include multiple groups of outer ring second weld mark groups 244 and one group of inner ring second weld mark group 245. Each weld mark group 240 can also be set to include one group of outer ring second weld mark group 244 and one group of inner ring second weld mark group 245, so as to reduce the difficulty of forming the second weld mark 242 located radially inside the first weld mark group 243 and reduce the difficulty of forming the second weld mark 242 located radially outside the first weld mark group 243, thereby reducing the difficulty of welding the collecting plate 200 and the tab welding area 110.

[0157] Of course, each weld mark group 240 may also be configured to include a group of outer ring second weld mark groups 244 and multiple groups of inner ring second weld mark groups 245, which will not be described in detail here.

[0158] In some embodiments, the second weld lines 242 in the outer second weld line group 244 and the second weld lines 242 in the inner second weld line group 245 are each independently formed into an arc shape, a straight line shape, or a wavy shape. In other words, the second weld lines 242 in the outer second weld line group 244 and the second weld lines 242 in the inner second weld line group 245 are independent of each other and can each be formed into an arc shape, a straight line shape, or a wavy shape, thereby reducing the difficulty of forming the second weld lines 242 in the outer second weld line group 244 and the second weld lines 242 in the inner second weld line group 245.

[0159] In summary, the cylindrical battery 1000 of the present application combines the stacked structure of its own end face tab 120 and the physical properties of copper-aluminum foil such as high melting point, high thermal conductivity and specific heat capacity, and designs a partitioned design for the current collecting plate 200, and designs weld lines of different patterns and directions, as well as staggered and intermittent welding methods. In combination with power regulation, the current collecting plate 200 and the tab 120 are welded together to solve the influence of the stacking difference of the tab 120 on the welding stability, and can solve the risk of burning the diaphragm caused by local heat superposition or heat conduction in the welding, thereby improving the stability of the welding process.

[0160] Through the above-mentioned setting, after the collecting plate 200 is peeled off, it can be found that the height of the weld dissolution boss on the peeling surface on the reverse side of the weld mark is consistent, and the weld mark can penetrate all the pole ears 120 in the radial direction of the pole core 100 and form an effective overcurrent connection, thereby realizing the overcurrent connection of all pole ears, and the weld mark has no interruption caused by cold welding and the pole ears 120 are not blackened or whitened due to over-welding, and the pole ears 120 are peeled evenly, with higher process stability.

[0161] Therefore, the welding connection method of the above-mentioned current collecting plate 200 and the tab 120 of the present application can be applied to the performance requirements of high-rate charge and discharge of full-tab battery cells.

[0162] The following describes an electric device according to an embodiment of the present invention.

[0163] An electric device according to an embodiment of the present invention includes a cylindrical battery 1000 .

[0164] Among them, the cylindrical battery 1000 is the aforementioned cylindrical battery 1000, and the specific structure of the cylindrical battery 1000 is not described here.

[0165] As can be seen from the above structure, the electrical device according to the embodiment of the present invention improves the working performance of the electrical device by adopting the aforementioned cylindrical battery 1000.

[0166] It should be noted that the electrical equipment of the present application may include, but is not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery-powered vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc. Electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0167] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "mounted" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0168] Among them, in the same weld line group 240, Figure 5Two second weld lines 242 are shown in the outer ring area 210, three first weld lines 241 are shown in the middle ring area 220, and three second weld lines 242 are shown in the inner ring area 230 for illustrative purposes. However, after reading the above technical solution, ordinary technicians can obviously understand that the solution can be applied to technical solutions with other numbers of first weld lines 241 and second weld lines 242, which also falls within the scope of protection of the present invention.

[0169] Other components of the cylindrical battery 1000 and the electrical device having the same according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0170] Throughout this specification, reference to terms such as "embodiment" or "example" indicates that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0171] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A cylindrical battery, characterized in that: include: A pole core, the pole core being formed in a cylindrical shape, and having a tab welding area provided on at least one side of the pole core in the axial direction of the pole core; A current collecting plate, wherein the current collecting plate is suitable for being welded to the pole tab welding area. In a radial direction parallel to the pole core, the current collecting plate is provided with an outer ring area, a middle ring area and an inner ring area from the outside to the inside. The middle ring area is located between the outer ring area and the inner ring area. The middle ring area is provided with a first weld mark. At least one of the inner ring area and the outer ring area is provided with a second weld mark. The first weld mark extends along the radial direction of the pole core, and the second weld mark extends along the circumferential direction of the pole core. The current collecting plate is welded to the pole tab welding area through the first weld mark and the second weld mark.

2. The cylindrical battery according to claim 1, characterized in that: In the radial direction of the pole core, the pole core includes a plurality of pole tabs, and the plurality of pole tabs are bent inward to define the pole tab welding area. The bending length of each pole tab is L1, the radial dimension of the inner ring area is H1, and the radial dimension of the outer ring area is H2. The cylindrical battery satisfies: 0.8L1≤H1≤1.3L1, and / or, 0.8L1≤H2≤1.3L1.

3. The cylindrical battery according to claim 1, characterized in that: A second weld mark is provided in the outer ring region. In a radial direction parallel to the pole core, there is a distance H3 between the outermost second weld mark in the outer ring region and the outer peripheral wall of the pole core.

4. The cylindrical battery according to claim 3, characterized in that: The distance H3 is ≥2 mm.

5. The cylindrical battery according to claim 1, characterized in that: At least one second weld line is provided in the outer ring region, and the radial width of each second weld line in the outer ring region is ≤0.5 mm; and / or, At least one second weld mark is provided in the inner ring region, and a radial width of each second weld mark in the inner ring region is ≤0.5 mm.

6. The cylindrical battery according to claim 5, characterized in that: The second weld bead in the outer ring region is formed in an arc shape, a straight line shape or a wave shape.

7. The cylindrical battery according to claim 1, characterized in that: A plurality of second welding lines are provided in the outer ring region and are spaced apart along the radial direction of the pole core.

8. The cylindrical battery according to claim 1, characterized in that: A plurality of second welding lines are provided in the inner ring region and are spaced apart along the radial direction of the pole core.

9. The cylindrical battery according to claim 8, characterized in that: The distance between radially adjacent second weld lines in the inner ring area ranges from 0.3 mm to 1.5 mm.

10. The cylindrical battery according to claim 8, characterized in that: The second weld bead in the inner ring region is formed in an arc shape, a straight line shape or a wave shape.

11. The cylindrical battery according to claim 8, characterized in that: In the radial direction parallel to the pole core, there is a spacing H4 between the innermost second weld mark in the inner ring area and the inner edge of the tab welding area, and the innermost second weld mark in the inner ring area is located radially outside the inner edge of the tab welding area.

12. The cylindrical battery according to claim 11, characterized in that: The distance H4 is ≥ 2 mm.

13. The cylindrical battery according to claim 1, characterized in that: The first weld line is formed as a continuously extending weld line; or, The first weld line includes a plurality of sub-weld lines spaced apart in a radial direction of the pole core.

14. The cylindrical battery according to any one of claims 1 to 13, characterized in that: In the circumferential direction of the pole core, the current collecting plate is provided with a plurality of weld line groups spaced apart along the circumferential direction of the pole core, and each weld line group includes a first weld line and a second weld line.

15. The cylindrical battery according to claim 14, characterized in that: Each group of the weld mark groups includes at least one first weld mark group, and each group of the first weld mark groups includes a plurality of first weld marks spaced apart along the circumference of the pole core.

16. The cylindrical battery according to claim 15, characterized in that: Each group of the first weld lines includes a plurality of the first weld lines arranged in parallel.

17. The cylindrical battery according to claim 15, characterized in that: At least a portion of the first weld lines in each group of the first weld lines are arranged crosswise. When there are multiple intersections, the spacing between adjacent intersections is greater than 2 mm.

18. The cylindrical battery according to claim 14, characterized in that: Each group of the weld mark groups includes multiple groups of first weld mark groups arranged at intervals along the circumference of the pole core, each group of the first weld mark groups includes multiple first weld marks arranged at intervals along the circumference of the pole core, and each group of the first weld mark groups is provided with the second weld mark on the radial inner side and the radial outer side.

19. The cylindrical battery according to claim 18, characterized in that: Each group of the weld mark groups includes multiple groups of outer ring second weld mark groups corresponding to the multiple groups of the first weld mark groups, the multiple groups of the outer ring second weld mark groups are arranged in the outer ring area and radially outward of the first weld mark groups, and each group of the outer ring second weld mark groups includes multiple second weld marks spaced apart along the radial direction of the pole core; and / or, Each group of the weld mark groups includes multiple groups of inner ring second weld mark groups corresponding to multiple groups of the first weld mark groups. The multiple groups of the inner ring second weld mark groups are arranged in the inner ring area and are located radially inward of the first weld mark groups. Each group of the inner ring second weld mark groups includes multiple second weld marks arranged at radial intervals along the pole core.

20. The cylindrical battery according to claim 18, characterized in that Each group of the weld mark groups includes multiple groups of outer ring second weld mark groups and one group of inner ring second weld mark groups corresponding to the multiple groups of the first weld mark groups. The multiple groups of the outer ring second weld mark groups are arranged in the outer ring area and are located radially outside the first weld mark group. Each group of the outer ring second weld mark groups includes multiple second weld marks arranged at intervals along the radial direction of the pole core. The inner ring second weld mark group is arranged in the inner ring area and is located radially inside the multiple groups of the first weld mark groups. The inner ring second weld mark group includes multiple second weld marks arranged at intervals along the radial direction of the pole core.

21. The cylindrical battery according to claim 19 or 20, characterized in that: The second weld lines in the outer ring second weld line group and the second weld lines in the inner ring second weld line group are formed in independent arc shapes, straight lines or wavy shapes.

22. An electrical device, characterized in that: Comprising a cylindrical battery according to any one of claims 1-21.

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