Cylindrical secondary battery

Abstract

The present disclosure provides a cylindrical secondary battery (1) and an assembly method thereof. The cylindrical secondary battery (1) includes a cylindrical can (2) with a beading groove (3), a first conductive sheet (4) with a first electrode coating (4a) wound to form a jelly roll (5), the first conductive sheet (4) having a portion free of the first electrode coating (4a) protruding at a first end side (5a), and an electrode lead plate (6) disposed at the first end side (5a) and in direct contact with the portion free of the first electrode coating (4a). The electrode lead plate (6) includes a flange (6a) extending away from the jelly roll (5) and disposed along an edge of the electrode lead plate (6). The beading groove (3) is disposed on the cylindrical can (2) such that the flange of the electrode lead plate (6) is bent and pressed inward toward the center of the cylindrical can (2) by the beading groove (3).

Description

[Technical Field]

[0001] The present disclosure relates to a cylindrical secondary battery and a method for assembling the same. [Background technology]

[0002] The transition from fossil fuels to renewable energy is gaining considerable momentum. One of the most important factors is the development of better and cheaper rechargeable batteries. Currently, lithium-ion batteries are becoming increasingly popular. They represent a type of rechargeable battery in which lithium ions move from the negative electrode to the positive electrode during discharge and vice versa during charging.

[0003] As the demand for rechargeable batteries increases, there is an increasing focus on production speed so that manufacturers can meet the demand. To achieve efficient production of rechargeable batteries, steps in the manufacturing process can be optimized. Another aspect to consider is that rechargeable batteries must be safe to use.

[0004] A rechargeable battery, or in other words a secondary battery, comprises one or more secondary cells. Summary of the Invention

[0005] In light of the above, it is an object of the present disclosure to provide an improved cylindrical secondary cell for rechargeable batteries.

[0006] This object is achieved by an apparatus according to claim 1 and a method according to claim 9.

[0007] The present disclosure provides a cylindrical secondary battery, the cylindrical secondary battery comprising: a cylindrical can, the cylindrical can having a beading groove formed in the wall thereof and arranged around the circumference of the cylindrical can; a first conductive sheet having a first electrode coating wound to form a jelly roll disposed within the can, wherein the first conductive sheet has a portion free of the first electrode coating protruding toward a first end of the jelly roll; an electrode that is electrically conductive and is disposed on the first end side of the jelly roll and that is in direct contact with at least a portion of the portion of the first conductive sheet that is free of the first electrode coating; Lead Board and Equipped with.

[0008] electrode Lead The plate extends away from the jelly roll and Lead The plate has flanges disposed along the edges thereof, and the beading grooves are Lead The plate is placed on the cylindrical can so that the flanges of the plate are bent and pressed inward toward the center of the cylindrical can by the beading grooves.

[0009] This cylindrical secondary battery allows the electrodes to be Lead The plate can be fixed in its position. Lead The plate is clamped between the jelly roll and the beading groove, thereby Lead The plate holds the jelly roll in place within the cylindrical can.

[0010] For cylindrical secondary batteries, beading is a common method of creating a groove in the side of a cylindrical can. The beading groove extends around the periphery of the can's side. Beading can be used to form a ledge to hold a cap or lid to close the end of the can, and can also be used to form a stop to prevent a jelly roll from moving inside the can.

[0011] The cylindrical secondary battery according to claim 1 is characterized in that the electrode Lead Since the plate is fixed between the jelly roll and the beading groove, the number of parts used and the steps required for assembly can be minimized. That is, other than the beading step, the jelly roll and / or the electrode Lead No additional steps are required to secure the plates.

[0012] Electrode deformed by the beading groove Lead By having a flange on the plate, the electrode Lead Pressure of the plate against the jelly roll is ensured, thereby providing good electrical contact between them and also preventing movement of the jelly roll.

[0013] It should be noted that the disclosure herein may be used on either the positive or negative side of a cylindrical secondary battery.

[0014] electrode Lead When used on the negative, or anode, side of the jelly roll, the plate comprises, for example, copper. Alternative materials include, for example, stainless steel, nickel, nickel / copper clad materials, or mixtures thereof.

[0015] electrode Lead When used on the positive, i.e., cathode, side of the jelly roll, the plate comprises, for example, aluminum or stainless steel or a mixture thereof.

[0016] According to some embodiments, an electrode Lead The plate is connected to the flange and the electrode Lead The plate has at least one slit disposed at least on the edge of the plate. Lead When the flange of the plate is deformed by the beading groove, the force of deformation Lead At least one slit may be used to reduce stresses induced in the plate.

[0017] According to some embodiments, an electrode Lead The plate is connected to the flange and the electrode Lead At least the edge of the plate is provided with at least two slits arranged in a symmetrical pattern around the edge. LeadDepending on the plate material, more or fewer slits may be used to reduce stress within the material. The width of the slits may also be varied. For example, Lead The plate is an electrode Lead The plate may have two slits wider than the six slits, i.e., one or more slits may be designed depending on the material and the number of slits.

[0018] According to some embodiments, an electrode Lead The plate has at least one through-hole for filling the electrolyte. Depending on the method for filling the cylindrical secondary battery with the electrolyte, the electrode Lead It may be necessary to provide one or more holes in the plate.

[0019] According to some embodiments, an electrode Lead The plate is in direct contact with the cylindrical can. Lead By making direct electrical contact between the plate and the cylindrical can, the sides of the can can be used as terminals for external loads, and current can be conducted to either end of the cylindrical can and terminated there. This allows for great flexibility in where the terminations can be placed. Direct electrical contact means direct electrical and physical contact.

[0020] According to some embodiments, an electrode Lead The flange of the plate is welded to the cylindrical can in the beading groove. The welding is performed by the electrode Lead In addition to securing the plate in place, the electrodes Lead Improves electrical contact between the plate and the cylindrical can.

[0021] According to some embodiments, the cylindrical secondary battery includes an electrode Lead The insulating member is disposed between the plate and the cylindrical can. In such a case, the terminals are disposed on the end side of the cylindrical can associated with the first end side of the jelly roll. The end side terminal arrangement is Lead The plate may be placed in electrical contact with the plate.

[0022] According to some embodiments, an electrode Lead The part of the plate closest to the edge is bent towards the jelly roll. Lead When the flange of the plate is bent inward by the beading groove, the electrode Lead The edges of the plate may be bent towards the jelly roll.

[0023] According to some embodiments, the cylindrical secondary battery includes a lid, the lid including an electrode Lead The plate rests on the beading groove on the side of the beading groove opposite the plate.

[0024] The present disclosure provides a method for assembling the cylindrical secondary battery described above. Assembling the cylindrical secondary battery includes: - placing the jelly roll in a cylindrical can; At least a portion of the first conductive sheet that is not coated with the first electrode is covered with the electrode Lead The electrode is placed in direct contact with the plate. Lead placing the plate (6) in a cylindrical can; -electrode Lead beading the cylindrical can to form a beading groove at a location on the cylindrical can such that the flange of the plate is bent and pressed inward toward the center of the cylindrical can by the beading groove; Equipped with.

[0025] This method uses a jelly roll and electrodes Lead It provides an efficient method of securing the plate within the cylindrical can, thus minimizing the number of steps and components. The same advantages as above apply here.

[0026] According to some embodiments, the method further comprises the steps of: -electrode Lead Disposing an insulating member between the plate and the cylindrical can Equipped with.

[0027] This is the electrode LeadThis is because the plate is electrically connected to an end terminal associated with the first end of the jelly roll, rather than to the side wall of the cylindrical can.

[0028] According to some aspects, the method comprises welding the flange to the cylindrical can. The welding is performed by a beading process using an electrode. Lead In addition to securing the plate in place, the electrodes Lead Improves electrical contact between the plate and the cylindrical can.

[0029] According to some embodiments, beading the cylindrical can to form a beading groove includes forming a beading groove on the electrode closest to the edge. Lead Also bend part of the board towards the jelly roll. [Brief explanation of the drawings]

[0030] Different aspects will now be described, by way of example, with reference to the accompanying drawings, in which: [Figure 1] FIG. 1 shows a cross-sectional view of an illustrative cylindrical secondary battery in which electrode lead plates and a jelly roll are fixed in place within a cylindrical can by beading grooves. [Figure 2] Figure 2 shows a cylindrical can with a jelly roll inserted and an electrode lead plate placed on top. [Figure 3] FIG. 3 shows the electrode lead plate positioned against the first end of the jelly roll. [Figure 4] FIG. 4 shows the jelly roll and electrode lead plates when fully inserted into the cylindrical can. [Figure 5] Figure 5 shows the cylindrical can after beading and how the beading grooves are positioned directly above the electrode lead plates, pushing them towards the jelly roll. [Figure 6] FIG. 6 shows an example of an electrode lead plate. [Figure 7] FIG. 7 shows an example of an electrode lead plate with more electrolyte filling holes. [Figure 8] FIG. 8 shows an example of an electrode lead plate having slits at the end. [Figure 9] FIG. 9 shows an example of an electrode lead plate having slits at the edge and more electrolyte filling holes. DETAILED DESCRIPTION OF THE INVENTION

[0031] The present disclosure is not limited to the disclosed embodiments, but can be varied and modified within the scope of the claims.

[0032] Aspects of the present disclosure will now be described with reference to the accompanying drawings. However, the devices and methods disclosed herein may be embodied in many different forms and should not be construed as limited to the aspects set forth herein.

[0033] The terminology used herein is for the purpose of describing particular embodiments of the application only and is not intended to be limiting of the present invention. The singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0034] The term "terminal" means the part of the secondary battery that is to be connected to an external load.

[0035] Alternative terms to the term "can" are "case" and "housing case."

[0036] Alternative terms to the term "conductive sheet" are "conductive substrate" and "current collector."

[0037] Figure 1 shows the electrode Lead A cross-sectional view of an illustrative cylindrical secondary battery is shown in which the plate and jelly roll 5 are secured in place within the cylindrical can 2 by beading grooves 3.

[0038] The cylindrical secondary battery 1 comprises a cylindrical can 2, and the cylindrical can 2 comprises a beading groove 3 formed in the wall of the cylindrical can 2 and arranged around the circumference of the cylindrical can 2. That is, the beading groove 3 is arranged around the cylindrical wall side.

[0039] The cylindrical secondary battery 1 comprises a first conductive sheet 4 having a first electrode coating wound to form a jelly roll 5 disposed in a can.

[0040] According to some embodiments, the cylindrical secondary battery 1 includes a second conductive sheet having a second electrode coating. The cylindrical secondary battery 1 may also include a separator sheet. The first conductive sheet 4 and the second conductive sheet, and optionally, the separator sheet, are wound to form a jelly roll 5. Alternatively, two separator sheets are present, such that the first conductive sheet 4, the first separator sheet, the second conductive sheet, and the second separator sheet are wound to form the jelly roll 5. For example, if a solid electrolyte is used in the cylindrical secondary battery 1, the separator sheet may not be present. For purposes of this disclosure, the first conductive sheet 4 having the first electrode coating 4a is the most relevant part, as the second conductive sheet may be realized in a different manner in the future without affecting the present disclosure.

[0041] The first conductive sheet 4 has a portion without the first electrode coating 4a that protrudes toward the first end side 5a of the jelly roll 5. Such a cylindrical secondary battery 1 with an uncoated conductive sheet protruding toward the end side of the jelly roll 5 is known as a tabless battery.

[0042] The cylindrical secondary battery 1 is electrically conductive and is disposed on the first end side 5a of the jelly roll 5, and is in direct contact with at least a portion of the portion 4a of the first conductive sheet 4 that is not provided with the first electrode coating. Lead Electrode 6, as shown in FIG. Lead The plate 6 is disposed within the cylindrical can 2 in direct contact with at least a portion of the portion of the first conductive sheet 4 that is free of the first electrode coating 4a. Lead Plate 6 is placed in direct electrical and physical contact with first conductive sheet 4 .

[0043] electrode Lead Plate 6 extends away from jelly roll 5 and Lead The plate 6 has a flange 6a disposed along the edge thereof, and the beading groove 3 is Lead The plate 6 is placed on the cylindrical can 2 so that the flange of the plate 6 is bent and pressed inward toward the center of the cylindrical can 2 by the beading groove 3.

[0044] That is, the electrode Lead Plate 6 has electrodes along its edges. Lead The plate 6 has a protruding portion on the side opposite the jelly roll 5. Thus, the flange faces away from the jelly roll 5.

[0045] The flange is Lead It should be noted that the flange does not have to be continuous around the entire periphery of the plate 6. The flange may comprise several separate flanges located at the edge and directed away from the jelly roll 5.

[0046] The flange can be, for example, a flat electrode Lead It is made by stamping a plate and folding the edges.

[0047] In Figure 1, the flange appears to be completely bent, and the bend is Lead Note also that it is parallel to the rest of the plate 6. It may, but may not, be bent inwards less than shown in Figure 1. For the beading groove 3, it is sufficient to bend the flange inwards slightly.

[0048] 2 to 5 show the jelly roll 5 and the electrode Lead The different stages when the plate is inserted into the cylindrical can 2 are shown in Figure 2. The jelly roll 5 is inserted and the electrode Lead FIG. 3 shows a cylindrical can 2 with a plate placed on top. Lead The plate is shown positioned against the first end side 5a of the jelly roll 5. FIG. LeadThe plate is shown when fully inserted into the cylindrical can 2. Figure 5 shows the cylindrical can 2 after beading and how the beading groove 3 forms the electrode Lead The electrode is placed directly above the plate 6. Lead Show how to push plate 6 towards the jelly roll.

[0049] In FIG. 2, the dark end of the jelly roll 5 is the portion of the jelly roll 5 that is free of the first electrode coating 4a that protrudes to the first end side 5a of the jelly roll 5. Lead In the drawing, the electrode Lead Note that the board is not completely visible and is slightly cut away.

[0050] In Figure 3, the electrode Lead The plate 6 is arranged to abut the portion of the electrode 4 that is free of the first electrode coating 4a. Lead The plate 6 may be welded to or otherwise conductively attached to the portion free of the first electrode coating 4a.

[0051] In Figure 4, the jelly roll 5 and the electrode Lead The plates are placed in a cylindrical can 2, which in FIG. Lead The plate is beaded so that it is clamped towards the jelly roll 5. At this point, the cylindrical secondary battery 1 is not completed, and the cylindrical can 2 has the electrodes Lead Note that the top of plate 6 is open and may be closed, for example, by a lid 7 as further described below.

[0052] This cylindrical secondary battery 1 has an electrode Lead The plate 6 can be fixed in place. Lead The plate 6 is clamped between the jelly roll 5 and the beading groove 3, thereby forming an electrode Lead Plate 6 holds jelly roll 5 in place within cylindrical can 2.

[0053] For cylindrical secondary batteries, beading is a common method of creating a groove in the side of a cylindrical can 2. The beading groove 3 extends around the periphery of the can's side. The beading can be used to form a ledge to hold a cap or lid 7 to close the end of the can, and can also be used to form a stop to prevent a jelly roll 5 from moving within the can.

[0054] The cylindrical secondary battery 1 according to the present invention can be used to form electrodes in a beading process. Lead Since the plate 6 is fixed between the jelly roll 5 and the beading groove 3, the number of parts used and the steps required for assembly can be minimized. That is, other than the beading step, the jelly roll 5 and / or the electrode Lead No additional steps are required to fasten the plate 6.

[0055] Electrode deformed by beading groove 3 Lead By having a flange of the plate 6, the electrode Lead The pressure of the plate 6 against the jelly roll 5 is ensured, which provides good electrical contact between them and also prevents movement of the jelly roll 5.

[0056] electrode Lead Plate 6, when used on the positive side, i.e., the anode side, of jelly roll 5, comprises, for example, copper.

[0057] electrode Lead Plate 6, when used on the positive side, i.e., the cathode side, of jelly roll 5, comprises, for example, aluminum.

[0058] According to some embodiments, an electrode LeadThe flange of the plate 6 is welded to the cylindrical can at the beading groove. The welding can be performed either before or after beading of the cylindrical can. That is, in the method of assembling a cylindrical secondary battery described below, a step of welding the flange to the cylindrical can may be added either before or after beading. The welding is performed, for example, from the outside of the cylindrical can, and it is particularly beneficial if the welding is performed after beading, since it is easier to reach the welding position. The welding method is performed by attaching the cylindrical can to the electrode. Lead This can be any method suitable for welding to the plate 6. The welding method is, for example, laser welding or resistance welding.

[0059] Figure 6 shows the electrode Lead Figure 7 shows an example of an electrode with more electrolyte-filled holes. Lead An example of a plate is shown below.

[0060] According to some embodiments, an electrode Lead The plate 6 has at least one through-hole for filling the electrolyte. Depending on the method for filling the cylindrical secondary battery 1 with the electrolyte, the electrode Lead It may be necessary to provide one or more holes in the plate 6. At least one hole may be arranged differently than shown in the figure. The star-shaped configuration of FIG. 7 is preferred because the arrangement of holes allows for several straight weld lines across the plate from one end to the other. Lead This can be beneficial if the plate is to be welded to an uncoated section.

[0061] FIG. 8 shows an electrode with slits at the end. Lead Figure 9 shows an example of an electrode with slits at the edge and more electrolyte filling holes. Lead An example of a plate is shown below.

[0062] According to some embodiments, an electrode Lead The plate 6 is provided with a flange and an electrode. Lead The plate 6 has at least one slit arranged at least on the edge thereof. LeadWhen the flange of the plate is deformed by the beading groove 3, the force generated by the deformation causes the electrode Lead At least one slit may be used to reduce stresses in the plate. Lead If the flange is made in a stamping process, the at least one slit may be made prior to or in the same process as stamping.

[0063] According to some embodiments, an electrode Lead Plate 6 is a flange and an electrode Lead At least the edge of the plate 6 is provided with at least two slits arranged in a symmetrical pattern around the edge. Lead Depending on the plate material, more or fewer slits can be used to reduce stress in the material. The width of the slits can also be varied. For example, Lead The plate is an electrode Lead The plate may have two slits wider than the one with six slits, i.e., one or more slits may be designed depending on the number of slits and the material.

[0064] At least one slit is formed in the flange to extend from the edge to the electrode. Lead According to some embodiments, at least one slit extends to the inside of the plate. Lead The at least one slit extends into the plate by 1 to 20 mm, preferably 1 to 10 mm. According to some embodiments, the at least one slit has a width of 0.5 to 4 mm, preferably 0.5 to 2 mm. In one example, the at least one slit is Lead It extends 5 mm into the disc towards the centre of the plate and has a width of 1 mm.

[0065] Illustrative electrodes of FIGS. 8 and 9 Reed plate As seen at 6, at least one slit extends into at least some of the electrolyte fill holes.

[0066] As can be seen in the example in Figure 1, the electrodes Reed plate6 may be in direct contact with the cylindrical can 2. Lead By making direct electrical contact between the plate and the cylindrical can 2, the sides of the can can be used as terminals for external loads, and current can be routed to either end of the cylindrical can 2 and terminated there, providing great flexibility in where the terminations can be placed. Reed plate is placed in direct electrical and physical contact with the cylindrical can.

[0067] In an example not shown, the cylindrical secondary battery 1 has an electrode Lead An insulating member may be disposed between the plate 6 and the cylindrical can 2. In such a case, the terminals are disposed on the end side of the cylindrical can 2 associated with the first end side 5a of the jelly roll 5. The end side terminal arrangement may be Lead It may be placed in electrical contact with plate 6 .

[0068] In another example not shown, the electrode Lead The portion of the plate 6 closest to the edge can be bent towards the jelly roll 5. Lead When the flange of the plate 6 is bent inward by the beading groove 3, the electrode Lead The edges of the plate 6 can be bent towards the jelly roll 5. Lead The outer edge of the plate 6 is bent towards the jelly roll, with the flange first extending upward before being bent inwards towards the centre of the cylindrical can.

[0069] As can be seen in the example of FIG. 1, the cylindrical secondary battery 1 may include a lid 7, which may include an electrode Lead The plate 6 rests on the beading groove 3 on the side of the beading groove 3 opposite the plate 6. The lid 7 can be designed in various ways and can be fixed to the can by beading or seaming, for example.

[0070] In this disclosure, there is no mention of the end side of the cylindrical secondary battery 1 opposite to the side having the beading groove 3. There are many ways to connect the other side of the jelly roll 5 to a terminal, and these are LeadIt does not affect how the plate 6 is locked in place by the beading groove 3. Lead When the plate is in direct contact with the cylindrical can 2, the terminal for the external load can be disposed on either side of the cylindrical can 2. As an example, one terminal of the cylindrical secondary battery 1 can be disposed at the center of the bottom surface, which is the bottom surface when the cylindrical secondary battery is disposed as shown in Figures 2 to 5, and the other terminal can be disposed around the first terminal with an insulator in between.

[0071] The present disclosure provides a method for assembling the above-mentioned cylindrical secondary battery 1. Assembling the cylindrical secondary battery 1 includes the steps of: - placing a jelly roll 5 in the cylindrical can 2; At least a part of the portion of the first conductive sheet 4 that does not have the first electrode coating 4a is an electrode Lead The electrode is in direct contact with the plate 6. Lead placing a plate 6 in said cylindrical can 2; - the electrode Lead beading the cylindrical can 2 to form the beading groove 3 at a position on the cylindrical can 2 so that the flange of the plate 6 is bent and pressed inward toward the center of the cylindrical can 2 by the beading groove 3; Equipped with.

[0072] This method uses a jelly roll 5 and an electrode Lead This provides an efficient way of fixing the plate 6 within the cylindrical can 2. Thus, the number of steps and components is minimized. The same advantages as above apply here. These steps can be seen in Figures 2 to 5.

[0073] According to some embodiments, the method further comprises the steps of: Lead The method further comprises disposing an insulating member between the plate 6 and the cylindrical can 2. This is because the electrode Lead This is in case the plate 6 is electrically connected to the end terminal associated with the first end side 5 a of the jelly roll 5 rather than to the side wall of the cylindrical can 2 .

[0074] According to some embodiments, beading the cylindrical can 2 to form the beading groove 3 includes forming a beading groove 3 on the electrode closest to the edge. Lead A part of the plate 6 is also bent toward the jelly roll 5.

[0075] [Reference List] 1. Cylindrical secondary battery 2. Cylindrical cans 3.Beading groove 4. First conductive sheet a. First electrode coating 5. Jelly Roll a. First end side 6. Electrode Lead board 7. Lid The following is a summary of the claims as originally filed: [C1] A cylindrical secondary battery (1), a cylindrical can (2) with beading grooves (3) formed in the wall of said cylindrical can (2) and arranged around the circumference of said cylindrical can (2); - a first conductive sheet (4) having a first electrode coating (4a) wound to form a jelly roll (5) disposed within the cylindrical can (2), wherein the first conductive sheet (4) has a portion free of the first electrode coating (4a) protruding toward a first end side (5a) of the jelly roll (5); an electrode that is electrically conductive and is arranged on the first end side (5a) of the jelly roll (5) and that is in direct contact with at least a portion of the portion of the first electrically conductive sheet (4) that is free of the first electrode coating (4a); Lead Board (6) and Equipped with The electrode Lead A plate (6) extends away from the jelly roll (5) and Lead The plate (6) has a flange (6a) arranged along the edge thereof, and the beading groove (3) is LeadA cylindrical secondary battery (1) characterized in that the flange of the plate (6) is placed on the cylindrical can (2) so that it is bent and pressed inward toward the center of the cylindrical can (2) by the beading groove (3). [C2] The electrode Lead The plate (6) is connected to the flange and the electrode Lead The cylindrical secondary battery (1) according to C1, comprising at least one slit (6a) disposed at least on the edge of the plate (6). [C3] The electrode Lead The plate (6) is connected to the flange and the electrode Lead The cylindrical secondary battery (1) of C2, wherein at least the edge of the plate (6) is provided with at least two slits (6a) arranged in a symmetrical pattern around the edge. [C4] The electrode Lead The cylindrical secondary battery (1) according to any one of C1 to C3, wherein the plate (6) includes at least one through-hole (6b) for filling with an electrolyte. [C5] The electrode Lead The cylindrical secondary battery (1) according to any one of C1 to C4, wherein the plate (6) is in direct contact with the cylindrical can (2). [C6] The electrode Lead The cylindrical secondary battery (1) according to any one of C1 to C5, wherein the flange of the plate (6) is welded to the cylindrical can (3) at the beading groove. [C7] The electrode Lead The cylindrical secondary battery (1) according to any one of C1 to C5, comprising an insulating member disposed between the plate (6) and the cylindrical can (2). [C8] The electrode Lead 8. The cylindrical secondary battery (1) according to any one of claims 1 to 7, wherein the portion of the plate (6) closest to the edge is bent towards the jelly roll (5). [C9] The electrode is provided with a lid (7). LeadThe cylindrical secondary battery (1) according to any one of C1 to C8, wherein the battery (1) is placed on the beading groove (3) on the side of the beading groove (3) opposite to the plate (6). [C10] A method for assembling the cylindrical secondary battery (1) according to any one of C1 to C8, wherein the assembling of the cylindrical secondary battery (1) comprises: - placing said jelly roll (5) in said cylindrical can (2); - at least a part of the portion (4a) of the first conductive sheet (4) that is free of the first electrode coating (4a) is Lead The electrode (6) is in direct contact with the plate (6). Lead placing a plate (6) in the cylindrical can (2); - the electrode Lead beading the cylindrical can (2) to form the beading groove (3) at a position on the cylindrical can (2) so that the flange of the plate (6) is bent and pressed inward toward the center of the cylindrical can (2) by the beading groove (3); A method comprising: [C11] Before beading - the electrode Lead An insulating member is disposed between the plate (6) and the cylindrical can (2). The method of claim C10, comprising: [C12] - welding said flange to said cylindrical can; The method of claim C10, comprising: [C13] The beading of the cylindrical can (2) to form the beading groove (3) is performed by forming the electrode closest to the edge. Lead The method according to any one of C10 to C12, wherein a portion of the plate (6) is also bent towards the jelly roll (5).

Claims

1. A cylindrical secondary battery (1), a cylindrical can (2) with beading grooves (3) formed in the wall of said cylindrical can (2) and arranged around the circumference of said cylindrical can (2); a first conductive sheet (4) having a first electrode coating (4a) wound to form a jelly roll (5) placed inside the cylindrical can (2), wherein the first conductive sheet (4) has a portion free of the first electrode coating (4a) protruding towards a first end side (5a) of the jelly roll (5); an electrode lead plate (6) that is electrically conductive and is arranged on the first end side (5a) of the jelly roll (5) and that is in direct contact with at least a part of the portion of the first conductive sheet (4) that is free of the first electrode coating (4a); Equipped with the electrode lead plate (6) has a flange (6a) extending away from the jelly roll (5) and arranged along the edge of the electrode lead plate (6); the beading groove (3) is arranged on the cylindrical can (2) so that the flange of the electrode lead plate (6) is bent and pressed inward toward the center of the cylindrical can (2) by the beading groove (3); and the electrode lead plate (6) has at least one slit (6a) arranged in the flange and at least the edge of the electrode lead plate (6).

2. 2. The cylindrical secondary battery (1) according to claim 1, wherein the electrode lead plate (6) is provided with at least two slits (6a) in the flange and at least the edge of the electrode lead plate (6) arranged in a symmetrical pattern around the edge.

3. 3. The cylindrical secondary battery (1) according to claim 1, wherein the electrode lead plate (6) includes at least one through-hole (6b) for filling with an electrolyte.

4. 2. The cylindrical secondary battery (1) according to claim 1, wherein the electrode lead plate (6) is in direct contact with the cylindrical can (2).

5. 2. The cylindrical secondary battery (1) according to claim 1, wherein the flange of the electrode lead plate (6) is welded to the cylindrical can (3) at the beading groove.

6. 2. The cylindrical secondary battery (1) according to claim 1, further comprising an insulating member disposed between the electrode lead plate (6) and the cylindrical can (2).

7. 2. The cylindrical secondary battery (1) according to claim 1, wherein the portion of the electrode lead plate (6) closest to the edge is bent toward the jelly roll (5).

8. 2. The cylindrical secondary battery (1) according to claim 1, further comprising a lid (7), the lid (7) being placed on the beading groove (3) on the side of the beading groove (3) opposite the electrode lead plate (6).

9. 2. A method for assembling a cylindrical secondary battery (1) according to claim 1, wherein the assembling of the cylindrical secondary battery (1) comprises: - placing said jelly roll (5) in said cylindrical can (2); - placing the electrode lead plate (6) in the cylindrical can (2) so that at least a part of the portion (4a) of the first conductive sheet (4) that is free of the first electrode coating (4a) is in direct contact with the electrode lead plate (6); - beading the cylindrical can (2) to form the beading grooves (3) at positions on the cylindrical can (2) so that the flanges of the electrode lead plates (6) are bent and pressed inward toward the center of the cylindrical can (2) by the beading grooves (3); A method comprising:

10. Before beading - Placing an insulating member between the electrode lead plate (6) and the cylindrical can (2). The method of claim 9 comprising:

11. - welding said flange to said cylindrical can The method of claim 9 comprising:

12. 12. The method according to claim 9, wherein the beading of the cylindrical can (2) to form the beading groove (3) also bends a portion of the electrode lead plate (6) closest to the edge toward the jelly roll (5).

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