JP2012038477A - Cylindrical battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cylindrical battery which can simply and sufficiently ensure an electrical conduction between a positive electrode collector member and a lid, and can be easily assembled.SOLUTION: A cylindrical battery 1 comprises a lid case (connection member) 35 electrically connecting a positive electrode collector member 40 and a lid 31 in the state of being interposed therebetween. The lid case 35 is fixed to the positive electrode collector member 40 in the state that a contact pressure is applied to a contact area between the positive electrode collector member 40 and the lid case 35 by being press-contacted to the positive electrode collector member 40, and is electrically connected to the positive electrode collector member 40.

Description

  The present invention relates to a cylindrical battery used for a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery.

  Due to global warming environmental issues and fossil fuel depletion problems, each automobile manufacturer has developed and sold electric vehicles (EV) with a low environmental impact and hybrid electric vehicles (HEV) that assist electric motors with a part of driving, As a power source, a battery having high capacity and high output and durability in various environments is demanded.

  Currently, nickel-hydrogen batteries are the mainstream of batteries installed in these automobiles, and lithium ion secondary batteries are attracting attention as the next generation. These batteries are widely used for small-sized consumer products such as mobile phones and notebook computers, and the technology cultivated here is developed and applied to automobile applications.

  Structural features required for automotive applications include vibration durability in a wide frequency band, current collection structure that can withstand large currents of tens to hundreds of amps when batteries are made larger, and temperature ranges from low to high temperatures. Such as hermeticity.

  The shape of non-aqueous electrolyte secondary batteries such as lithium ion secondary batteries is generally roughly divided into cylindrical and rectangular shapes, and various shapes have been studied for cylindrical shapes, such as how to take out electrode terminals and sealing and sealing methods. Yes. In small consumer use, a method is used in which a tab is taken out for energization from uncoated portions of the positive electrode and the negative electrode, the positive electrode is welded to a lid, the negative electrode is welded to a battery can, and electricity is taken out. . In this case, one to several tabs are generally attached.

  In automobile applications, reliable conduction is required in order to withstand large current energization, and many tabs may be attached. These tabs are welded to the electrode current collecting member. For example, the positive electrode current collecting member is welded to the lid through the lead, and the negative electrode current collecting member is welded to the battery can (Patent Document 1).

JP 2002-231244 JP

  However, in the case of the method of connecting the positive electrode current collector and the lid through the lead, the electrical continuity is sufficiently ensured by welding, but the positive electrode current collector and the lead, and the lid and the lead are welded. There was a need to do. Since these welding operations cannot be welded if the electrolytic solution adheres to the welded portion, it is necessary to perform these welding operations prior to the liquid injection operation. On the other hand, if the welding operation is performed prior to the pouring operation, it is necessary to temporarily avoid the position of the lid in order to secure the electrolyte injection flow path, and to return the lid to a predetermined position after injecting the electrolyte. As a result, the work was complicated and man-hours were large.

  The present invention has been made in view of the above-described case, and the object thereof is to easily and sufficiently ensure the electrical continuity between the positive electrode current collecting member and the lid, and can be easily assembled. The object is to provide a cylindrical battery.

  The cylindrical battery of the present invention that solves the above problems includes a connection member that is interposed between the positive electrode current collector and the lid and electrically connects the positive electrode current collector and the lid, The connecting member is fixed to the positive current collecting member while being pressed against the positive current collecting member and applied a surface pressure to the contact surface portion between the positive current collecting member and the connecting member, and electrically connected to the positive current collecting member. It is characterized by being connected.

  According to the present invention, the connecting member that is interposed between the positive current collecting member and the lid and electrically connects the positive current collecting member and the lid is provided. The positive electrode current collector is fixed to the positive electrode current collector member while being pressed against the electric member to apply a surface pressure to the contact surface portion between the positive electrode current collector member and the connection member, and is electrically connected to the positive electrode current collector member. Therefore, electrical continuity between the positive electrode current collector and the lid can be ensured by the surface pressure, and the energization resistance of the contact surface portion between the positive electrode current collector and the lid can be reduced.

  Therefore, it is not necessary to perform a lead welding operation between the positive electrode current collecting member and the lid, and the connection work between the positive electrode current collecting member and the lid can be simplified and compared with the conventional case. Conduction can be ensured easily and reliably. And a lead can be omitted and the number of parts can be reduced.

  In addition, the timing of attaching the lid can be arbitrarily set. For example, by attaching the lid after injecting the electrolyte into the battery can, the lid can be shifted in position as in the past, Work such as returning to the position is unnecessary, man-hours for assembly can be reduced, and the work can be simplified. Further, it is possible to omit the operation of opening and closing the lid body in a state where the positive electrode current collecting member and the lid body are connected by leads as in the prior art, and the manufacturing cost can be reduced by reducing the number of steps.

Sectional drawing of the cylindrical battery in this Embodiment. The cross-sectional enlarged view which shows an example of the fixing method of a positive electrode current collection member and a cover case. The cross-sectional enlarged view which shows the decomposition | disassembly state of FIG. The cross-sectional enlarged view which shows another example of the fixing method of a positive electrode current collection member and a cover case. The cross-sectional enlarged view which shows the decomposition | disassembly state of FIG.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments in which the present invention is applied to a cylindrical battery will be described below with reference to the drawings.
In the present embodiment, the cylindrical battery 1 constitutes a lithium ion secondary battery. As shown in FIG. 1, a cylindrical battery can 11 having a bottom and an electrode accommodated in the battery can 11. A group 21 and a lid 31 that is caulked and fixed to the open end of the battery can 11 are sealed.

  The battery can 11 is made of nickel steel plated 0.5 mm thick carbon steel, and the dimensions are set to an outer diameter of 40 mm and a height of 100 mm. After the electrode group 21 is inserted, the battery can 11 is subjected to a grooving process immediately below the opening end portion to form the convex portion 12. The convex portion 12 has a shape that protrudes toward the center in the radial direction so that the lid body 31 can be placed and is continuous in a circumferential shape.

  A predetermined amount of electrolyte is injected into the battery can 11 after the electrode group 21 is accommodated. In the electrolyte solution, 1 mol of lithium hexafluorophosphate as an electrolyte is mixed in a mixed organic solvent in which ethylene carbonate (EC), dimethyl carbonate (DMC), and diethyl carbonate (DEC) are mixed at a volume ratio of 1: 1: 1. / L dissolved material is used.

  The electrode group 21 includes a wound body 25 configured by winding the positive electrode and the negative electrode around the shaft core 22 via a separator between the positive electrode and the negative electrode, and a positive electrode current collecting member provided at both ends of the wound body 25 40 and a negative electrode current collecting member 50.

  The positive electrode is composed of lithium manganate (LiMn 2 O 4), which is a typical lithium manganese composite oxide, as a positive electrode active material, with respect to 85 parts by weight of the positive electrode active material, 10 parts by weight of flake graphite as a conductive material, and polyfluoride as a binder. After adding 5 parts by weight of vinylidene chloride (PVDF) and adding N-methyl-2-pyrrolidone as a dispersion medium to this, the kneaded slurry was uniformly applied to both sides of an aluminum foil having a thickness of 20 μm and dried. The one obtained by pressing and cutting is used.

On the other hand, for the negative electrode, 90 parts by weight of amorphous carbon powder as a carbon material for the negative electrode active material, 10 parts by weight of polyvinylidene fluoride as a binder, and N-methyl-2-pyrrolidone as a dispersion medium are added thereto. The kneaded slurry is uniformly coated on both sides of a rolled copper foil having a thickness of 10 μm, dried, then pressed and cut.
For the separator, a polyethylene microporous film having a thickness of 30 μm is used.

  The negative electrode is slightly wider than the positive electrode, and a positive electrode tab 23 and a negative electrode tab 24 are formed on the long side of one side in the width direction of the positive electrode and the negative electrode, respectively. The positive electrode tab 23 and the negative electrode tab 24 are formed so as to be cut out in a rectangular shape at equal intervals on the long side portion, and formed so as to protrude from the electrode group 21 in a direction away from each other in the axial direction. Yes. The positive electrode tab 23 is welded and electrically connected to the positive electrode current collecting member 40, and the negative electrode tab 24 is welded and electrically connected to the negative electrode current collecting member 50.

  The positive electrode current collecting member 40 and the negative electrode current collecting member 50 are made of, for example, a conductive material such as metal, and are formed by a substantially circular plate-like member having an outer diameter slightly smaller than that of the wound body 25. The positive electrode current collecting member 40 is fixed to the end of the shaft core 22 on the positive electrode tab 23 side, and the negative electrode current collecting member 50 is fixed to the end of the shaft core 22 on the negative electrode tab 24 side.

  The positive electrode current collecting member 40 includes a circular plate-like web portion 41 and a boss portion 42 that protrudes in a cylindrical shape in the axial direction of the web portion 41 at the radial center position of the web portion 41 and is inserted into the end portion of the shaft core 22. And a peripheral wall portion (hole portion) 43 that is bent at the outer peripheral edge of the web portion 41 and protrudes in a direction opposite to the protruding direction of the boss portion 42.

  The web portion 41 is provided with a through hole 41a, and the electrolyte can be injected into the battery can 11 through the through hole 41a. Further, the through hole 41 a is used for positioning and fixing the positive electrode current collecting member 40 by inserting the tip of a positioning pin (not shown) when attaching the lid case 35 of the lid body 31 to the positive electrode current collecting member 40. be able to. An opening hole 42 a communicating with the center hole 22 a of the shaft core 22 is formed in the boss portion 42, and a welding tool (not shown) is inserted through the bottom portion 13 of the battery can 11 to connect the negative electrode current collecting member 50. The negative electrode lead 27 can be welded.

  The peripheral wall portion 43 has a short-axis cylindrical shape, and the inner peripheral surface of the peripheral wall portion 43 faces the outer peripheral surface of the peripheral wall portion 37 of the lid case 35 when a peripheral wall portion 37 of the lid case 35 described later is inserted. The inner diameter of the battery can 11 and the height in the axial direction projecting to the open end side of the protrusion 12 of the battery can 11 when the electrode group 21 is accommodated in the battery can 11. The positive electrode tab 23 of the electrode group 21 is welded to the outer peripheral surface of the peripheral wall portion 43.

  The negative electrode current collecting member 50 includes a circular plate-like web portion 51, a boss hole portion 52 that extends in a cylindrical shape in the axial direction at the center position in the radial direction of the web portion 51, and is externally fitted to the end portion of the shaft core 22. The peripheral leg 53 is bent at the outer peripheral edge of the web 51 and protrudes in the same direction as the boss hole 52. The leg portion 53 is for contacting the bottom portion 13 of the battery can 11 to support the electrode group 21 in the battery can 11, and the negative electrode tab 24 is welded to the outer peripheral surface of the leg portion 53.

  The negative electrode current collecting member 50 is provided with a negative electrode lead 27. One end of the negative electrode lead 27 is electrically connected to the negative electrode current collecting member 50. The other end of the negative electrode lead 27 is arranged to face the bottom surface 13 of the battery can 11 by inserting the electrode group 21 into the battery can 11 and is electrically connected to the battery can 11 by resistance welding.

  The lid 31 is made of a circular plate member having a size that closes the open end of the battery can 11, and a bulging portion 32 that protrudes in the axial direction from the battery can 11 is formed at the center position. A flat peripheral portion 33 is formed so as to surround the bulging portion 32.

  A lid case (connection member) 35 that is a characteristic configuration of the present invention is interposed between the lid body 31 and the positive electrode current collecting member 40.

  The lid case 35 electrically connects the positive electrode current collecting member 40 and the lid body 31, one end is connected to the positive electrode current collecting member 40, and the other end is connected to the lid body 31. The lid case 35 is fixed to the positive electrode current collector member 40 while being pressed against the positive electrode current collector member 40 and applying a surface pressure to the contact surface portion between the positive electrode current collector member 40 and the lid case 35. It has the structure electrically connected to.

  The lid case 35 is made of a ring-shaped member, and is bent at a peripheral wall portion (shaft portion) 37 inserted on the inner diameter side of the peripheral wall portion 43 of the positive electrode current collector member 40 and one end portion in the axial direction of the peripheral wall portion. A mounting portion 36 that spreads in the form of a plate toward the outside in the direction, and a bent portion 38 that is bent at the outer peripheral edge of the mounting portion 36 and protrudes in a direction away from the peripheral wall portion 37 along the axial direction. ing.

  The peripheral wall portion 37 has a short-axis cylindrical shape, and forms an outer diameter facing the inner peripheral surface of the peripheral wall portion 43 of the positive electrode current collecting member 40 and a central opening serving as an electrolyte injection channel. It has an inner diameter. The mounting portion 36 is formed so that the peripheral portion 33 of the lid body 31 can be placed on the upper surface in a state of being in contact with the entire periphery. The bent portion 38 is bent inward in the radial direction together with the open end of the battery can 11, so that the peripheral portion 33 of the lid 31 is sandwiched between the mounting portion 36 and the lid 31 is caulked and fixed. The case 35 and the lid 31 are electrically connected.

  2 and 3 are enlarged sectional views showing an example of a specific configuration of the lid case 35, FIG. 2 is an enlarged view of a portion A in FIG. 1, and FIG. 3 is an exploded view of FIG. The lid case 35A shown in FIGS. 2 and 3 is screwed to the positive electrode current collector 40 by a screw fastening structure.

  The lid case 35 </ b> A is screwed with the male screw portion 39 formed on the outer peripheral surface of the peripheral wall portion 37 of the lid case 35 into the female screw portion 44 formed on the inner peripheral surface of the peripheral wall portion 43 of the positive electrode current collecting member 40. Accordingly, the positive electrode current collector 40 is moved in the axial direction.

  Then, the bottom surface portion (contact surface portion of the connecting member) of the mounting portion 36 of the lid case 35A is pressed against the top surface portion (contact surface portion of the positive electrode current collecting member) of the peripheral wall portion 43 of the positive electrode current collecting member 40, and the top surface portion It fixes to the positive electrode current collection member 40 in the state which applied the surface pressure between the lower surface part.

  4 and 5 are enlarged sectional views showing another example of the specific structure of the lid case 35, FIG. 4 is an enlarged view of a portion A in FIG. 1, and FIG. 5 is an exploded view of FIG. . 4 and 5 can be fitted by press-fitting the peripheral wall portion (shaft portion) 37 of the cover case 35 into the inner diameter side (inside the hole portion) of the peripheral wall portion 43 of the positive electrode current collecting member 40. It has a press-fit fitting structure.

  The outer diameter of the peripheral wall portion 37 of the lid case 35 is slightly larger than the inner diameter of the peripheral wall portion 43 of the positive electrode current collecting member 40. When the peripheral wall portion 37 is press-fitted, at least one of the peripheral wall portion 43 of the positive electrode current collecting member 40 and the peripheral wall portion 37 of the lid case 35 is elastically deformed in the radial direction, and the inner peripheral surface portion of the peripheral wall portion 43 is formed on the inner peripheral surface portion. The outer peripheral surface portion is set to a size that is pressed in a state where a predetermined surface pressure is applied.

  Further, at least one of the distal end portion of the peripheral wall portion 43 of the positive electrode current collecting member 40 and the distal end portion of the peripheral wall portion 37 of the lid case 35 is disposed on the inner diameter side of the peripheral wall portion 43 of the positive electrode current collecting member 40. A chamfering process for facilitating the insertion of the tip of 37 is performed.

Next, a method for assembling the cylindrical battery 1 having the above configuration will be described.
First, a separator is interposed between the positive electrode and the negative electrode, and the positive electrode and the negative electrode are wound around the shaft core 22 to form a wound body 25. A positive current collector 40 and a negative current collector are formed at both ends of the wound body 25. 50 is attached to form the electrode group 21. In the electrode group 21, the positive electrode tab 23 is welded to the positive electrode current collecting member 40, the negative electrode tab 24 is welded to the negative electrode current collecting member 50, and the negative electrode lead 27 is welded to the negative electrode current collecting member 50. And the electrode group 21 is accommodated in the battery can 11, and the negative electrode lead 27 and the battery can 11 are welded. Thereby, the battery can 11 and the electrode group 21 are fixed integrally.

  Then, a grooving process is performed immediately below the open end of the battery can 11 to form a convex portion 12, and the gasket 10 is inserted. Then, the lid case 35 is pressed against the positive electrode current collecting member 40 and fixed in a state where a surface pressure is applied to the contact surface portion with the positive electrode current collecting member 40.

  Here, in the case of the lid case 35 </ b> A shown in FIGS. 2 and 3, the male screw portion 39 of the lid case 35 </ b> A is screwed into the female screw portion 44 of the positive electrode current collecting member 40, and the positive electrode current collecting member 40 is covered with the lid. The case 35 is fastened with screws. By this screw fastening, the positive electrode current collecting member 40 and the lid case 35 </ b> A are such that the top surface portion of the peripheral wall portion 43 of the positive electrode current collecting member 40 is pressed against the lower surface portion of the mounting portion 36 of the lid case 35. It is fixed in a state where surface pressure is applied to the part. By this fixing, the positive electrode current collecting member 40 and the lid case 35A are electrically connected.

  For example, a jig such as a pin is inserted from above the battery can 11 to press the positive current collecting member 40 against the battery can 11 so that the positive current collecting member 40 and the battery can 11 do not rotate relative to each other. A method of rotating the lid case 35 in a state in which the rotation of the lid case 35 is fixed, or a method of rotating the lid case 35A in a state in which the positive electrode current collection member 40 is fixed in the direction of rotation by inserting a pin into the through hole 41a of the positive electrode current collection member 40. Is done by.

  4 and 5, the peripheral wall portion 37 of the lid case 35B is press-fitted into the inner diameter side of the peripheral wall portion 43 of the positive electrode current collecting member 40 so that the positive electrode current collecting member 40 is covered with the lid case 35B. 35B is fitted. By this press fitting, the positive electrode current collecting member 40 and the lid case 35B are elastically deformed in the radial direction at least one of the peripheral wall portion 43 of the positive electrode current collector member 40 and the peripheral wall portion 37 of the lid case 35B. The outer peripheral surface portion of the peripheral wall portion 37 is fixed in a state of being pressed against the inner peripheral surface portion. By this fixing, the positive electrode current collecting member 40 and the lid case 35B are electrically connected.

  The axial force acting on the positive electrode current collecting member 40 during press-fitting is transmitted from the positive electrode current collecting member 40 to the shaft core 22, and is transmitted from the shaft core 22 to the battery can 11 via the negative electrode current collecting member 50. The battery can 11 is received. Therefore, the peripheral wall portion 37 of the lid case 35 </ b> B can be press-fitted into the inner diameter side of the peripheral wall portion 43 of the positive electrode current collecting member 40.

  After fixing the lid case 35 to the positive electrode current collecting member 40, the electrolytic solution is injected into the battery can 11. At the center of the lid case 35, there is a large central opening, and there is nothing that obstructs injection of the electrolyte such as a conventional positive electrode rib, so that the electrolyte can be easily injected.

  After injecting the electrolyte, the lid 31 is attached to the battery can 11 and the open end of the battery can 11 is sealed. The lid 31 is inserted into the battery can 11 from above the battery can 11, and the outer peripheral edge 33 of the lid 31 is placed on the mounting portion 36 of the lid case 35. Then, the lid 31 is caulked and fixed to the battery can 11 by integrally bending the open end of the battery can 11, the gasket 10, and the bent portion 38 of the lid case 35 radially inward. By this caulking and fixing, the outer peripheral edge portion 33 of the lid body 31 is sandwiched between the placing portion 36 and the bent portion 38, the lid case 35 and the lid body 31 are electrically connected, and the lid The open end of the battery can 11 is sealed by the body 31.

  As described above, in the cylindrical battery 1 of the present invention, the lid case 35 is fixed to the positive electrode current collecting member 40 by screw fastening or press fitting (step S101), and the electrolytic solution is injected into the battery can 11 ( In step S102), the lid 31 is assembled by being caulked and fixed to the battery can 11 (step S103).

  On the other hand, in the conventional cylindrical battery, one end of the positive electrode lead is welded to the positive electrode current collecting member (step S111), and the other end of the positive electrode lead is welded to the lid case (step S112), thereby securing an electrolyte injection channel. In order to do so, the electrolyte is injected into the battery can 11 with the position of the lid case shifted (step S113), the lid case is returned to the normal position (step S114), and the lid body is set in the lid case and caulked. It is assembled by fixing (step S115).

  Therefore, in order to ensure electrical continuity between the positive electrode current collecting member 40 and the lid 31, in the conventional cylindrical battery, the step of step S111 for welding one end of the positive electrode lead to the positive electrode current collecting member; In the cylindrical battery 1 according to the present embodiment, the lid case 35 is screwed to the positive electrode current collecting member 40, whereas the two steps of the step S112 of welding the other end of the positive electrode lead to the lid are necessary. Alternatively, one step of step S101 for press-fitting and fitting may be performed, the number of assembling steps can be reduced as compared with the conventional case, and the efficiency of the assembling work can be improved.

  Further, in the conventional cylindrical battery, when the position of the lid case is shifted in order to secure a flow path for injecting the electrolytic solution, after the electrolytic solution is injected, the lid case is returned to the normal position S114. On the other hand, in the cylindrical battery 1 of the present embodiment, the electrolytic solution can be injected from the central opening of the lid case 35 with the lid case 35 attached to a normal position. Therefore, the process of step S114 for returning the conventional lid case to the normal position is unnecessary, the number of assembling steps can be reduced, and the efficiency of the assembling work can be improved.

  Further, in the conventional cylindrical battery, the positive electrode lead that electrically connects the positive electrode current collecting member and the lid case is necessary. However, in the cylindrical battery 1 according to the present embodiment, the positive electrode lead is unnecessary. Therefore, the number of parts can be reduced.

  Further, according to the cylindrical battery in the present embodiment, it is not necessary to prepare an upper lid assembly in advance, and the open end portion of the battery can 11, the gasket 10, and the bent portion 38 of the lid case 35 are radially inward. Since the lid body 31 can be caulked and fixed to the battery can 11 by being bent together, it can be manufactured in a short time.

  According to the cylindrical battery 1 in the present embodiment described above, the lid case 35 is pressed against the positive electrode current collecting member 40 to apply a surface pressure to the contact surface portion between the positive electrode current collecting member 40 and the lid case 35. Is fixed to the positive electrode current collector member 40 and is electrically connected to the positive electrode current collector member 40, so that electrical continuity between the positive electrode current collector member 40 and the lid 31 can be ensured by the surface pressure. In addition, the energization resistance of the contact surface portion between the positive electrode current collecting member 40 and the lid 31 can be reduced.

  Moreover, according to the cylindrical battery 1, the timing which attaches the cover case 35 to the positive electrode current collection member 40 can be set arbitrarily, for example, after attaching electrolyte solution in the battery can 11, the cover case 35 is attached. be able to.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the present embodiment, as shown in FIGS. 2 and 3, the case where the male screw part 39 is provided in the lid case 35 and the female screw part 44 is provided in the positive electrode current collecting member 40 has been described as an example. The positive electrode current collecting member 40 may be provided with a male screw portion, and the lid case 35 may be provided with a female screw portion.

  4 and 5, the case where the peripheral wall portion 37 of the lid case 35 is press-fitted into the inner diameter side of the peripheral wall portion of the positive electrode current collecting member 35 has been described as an example. It is good also as a structure by which the surrounding wall part 37 of the cover case 35 is press-fitted on the outer-diameter side of a surrounding wall part, and is externally fitted.

10 Gasket 11 Battery Can 21 Electrode Group 31 Lid 35 Lid Case (Connecting Member)
37 Peripheral wall (shaft)
39 Male thread portion 40 Positive electrode current collecting member 43 Peripheral wall portion (hole portion)
44 Female thread portion 50 Negative electrode current collecting member

Claims (4)

A cylindrical battery having an electrode group having a positive electrode current collecting member and a negative electrode current collecting member, a bottomed cylindrical battery can in which the electrode group is accommodated, and a lid for sealing the open end of the battery can. And
A connecting member interposed between the positive current collector and the lid and electrically connecting the positive current collector and the lid;
The connecting member is fixed to the positive current collecting member while being pressed against the positive current collecting member and applying a surface pressure to a contact surface portion between the positive current collecting member and the connecting member; A cylindrical battery characterized by being electrically connected to the battery.   By screwing the male screw portion provided on either the positive electrode current collector member or the connection member into the female screw portion provided on either the positive electrode current collector member or the connection member, the It has a screw fastening structure in which the connecting member is moved in the axial direction with respect to the positive electrode current collecting member, and the screw is fastened with the contact surface portion of the connecting member being pressed against the contact surface portion of the positive electrode current collecting member. The cylindrical battery according to claim 1.   By press-fitting a shaft portion provided on either the positive electrode current collector member or the connection member into a hole portion provided on either the positive electrode current collector member or the connection member, the hole portion 2. The cylindrical battery according to claim 1, wherein the cylindrical battery has a press-fitting fitting structure in which the outer peripheral surface portion of the shaft portion is fitted to the inner peripheral surface portion while being pressed.   4. The cylindrical battery according to claim 1, wherein the connection member is electrically connected to the lid body by caulking. 5.

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