JP5196898B2 - Method for fixing lid member to container, metal sealed container and sealed battery - Google Patents

Description

  The present invention relates to a method for fixing a lid member to a container in which the lid member is fixed to the opening of the metal container by tightening, and a metal sealed container and a sealed battery manufactured using the fixing method.

  A sealed battery such as a lithium battery is manufactured by housing an electrode body made of an electrode, a separator, an electrolytic solution, etc. in a bottomed cylindrical metal outer can, and sealing the opening of the outer can with a lid member. For joining the outer peripheral part of the lid member and the opening side end of the outer can, a method such as laser welding may be used, but the opening side end of the outer can is caulked from the viewpoint of easy manufacture. Many methods of fixing the lid member are used (see, for example, Patent Document 1).

  Further, Patent Document 2 proposes using winding by a method similar to press working as a simpler fixing method than the caulking fixing method. In the fixing method described in Patent Document 2, as shown in FIG. 16, a reduced diameter portion (stepped portion) 73 having a reduced diameter is formed at the lower end of the tightening portion 72 of the can body (exterior can) 71. The lower end of the tightening portion 76 of the lid member 75 is brought into contact with the reduced diameter portion 73, thereby supporting the lower portions of the tightening portions 72 and 76 when pressing with a pressing die for tightening. Yes. The reduced diameter portion 73 is formed by reducing the plate thickness above the reduced diameter portion 73. In other words, in order to form a step portion at the lower end portion of the tightening portion 72, the upper end portion of the reduced diameter portion 73 is formed in the thin tightening portion 72 by, for example, drawing by a plurality of presses. .

JP 2003-257382 A JP 2007-7701 A

However, in the fixing method described in Patent Document 2, when pressing with a pressing die for tightening, the reduced diameter portion (stepped portion) 73 on the inner side of the lower end of the tightening portion 72 of the can body 71, The lower end of the tightening portion 76 of the lid member 75 is brought into contact with the lower portion of the tightening portions 72 and 76, so that the pressing force of the pressing die is large also in the portion of the can body 71 below the tightening portion 72. There is a risk of acting, causing inward deformation or dimensional deviation, and damage to the contents in the can body 71. Further, the lid member 75 may fall off from the reduced diameter portion (stepped portion) 73 due to the pressing force of the pressing die. Therefore, it is necessary to separately install a metal fitting or the like that receives the pressing force of the pressing die from the inside, which is complicated.
Further, in order to form the reduced diameter portion (stepped portion) 73 at the lower end portion of the tightening portion 72, the upper end portion of the reduced diameter portion 73 is formed in the thin tightening portion 72 by a plurality of drawing processes or the like. Since it is necessary, it takes time to process it.

  The present invention has been made in view of the above circumstances, and a method for fixing a lid member to a container that can be easily pressed by a pressing die for tightening without causing deformation or the like of the container. An object is to provide a sealed container and a sealed battery.

In order to achieve the above object, the method of fixing a lid member to a container according to the present invention comprises tightening a lid member having a bottom part and a rising part rising from an outer peripheral edge of the bottom part at the opening part of a metal container. upon fixed by,
The lid member is inserted into the container, the rising portion of the lid member is overlaid on an end portion on the opening side of the container, and pressed by a pressing die, and the end portion of the opening portion of the container and the container In the method of fixing the lid member to the container by winding the rising part of the lid member together inside or outside,
The container is shaped like a flat bottomed cylinder that is long in the lateral direction, and a flat portion formed between the lateral ends of the container in a pair of planar shapes,
After the lid member is inserted into a predetermined position in the opening of the container, a pair of pressing dies having a protruding part extending in the lateral direction is used, and the protruding part of the pressing mold is used in the container in the container. By pressing each flat part inside by the convex part toward the concave part formed on the outer peripheral surface of the bottom part of the lid member,
Only a pair of the flat portions of the container is formed with a linearly deforming portion extending in the lateral direction recessed inward by plastic deformation, and is closely attached to an outer peripheral surface of the container in a groove portion outside the linear deforming portion. By pressing the convex part provided in the metal mold | die, the convex part inside the said linear deformation part is pressed against the said recessed part of the said cover member, and the press by the said pressing die is performed, It is characterized by the above-mentioned.

The said structure WHEREIN: You may make it comprise the said recessed part of the said bottom part of the said cover member with the level | step-difference part by which the lower side was diameter-reduced.
Further, the container and / or the lid member may be formed by impact extrusion molding.
Moreover, you may make it manufacture a metal airtight container using the fixing method of the cover member to the container of the said structure.
Moreover, you may make it manufacture a sealed battery using the fixing method of the cover member to the container of the said structure.

  According to the method for fixing a lid member to a container of the present invention, a linearly deformed portion is formed by pressing a convex portion provided on a mold that is in close contact with the outer peripheral surface of the container against a groove on the outside of the linearly deformed portion of the container. The inner convex part of the mold is pressed against the concave part formed on the outer peripheral surface of the bottom part of the lid member, pressed by a pressing die, and tightened, so that the convex part of the mold causes the linear deformation part of the container to The pressing force of the pressing die is supported by the force pressed against the concave portion of the outer peripheral surface of the bottom portion. As a result, the pressing force applied to the portion of the container below the linear deformation portion is reduced, so that deformation and dimensional deviation of this portion can be prevented, and damage to the contents in the container can be prevented. Etc. can be prevented. In this way, pressing by the pressing die for tightening can be easily performed without separately installing a metal fitting or the like for receiving the pressing force of the pressing die.

Further, as described above, the convex portion of the mold supports the pressing force of the pressing die by the force pressing the linear deformation portion of the container against the concave portion of the outer peripheral surface of the bottom portion of the lid member. The member does not fall off from the linear deformation portion of the container.
Furthermore, since it is only necessary to form a linearly deformed portion by plastic deformation in the container, the thickness of the container can be made constant, and a plurality of drawing processes and the like are performed in order to form a thinly tightened portion as in the prior art. Since it is not necessary to carry out, the labor of processing can be reduced.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 15 are views showing a method for manufacturing a sealed battery according to an embodiment of the present invention. FIG. 1 is a perspective view of an outer can in a state formed by impact extrusion molding, and FIG. It is a perspective view of the lid member in the state formed by impact extrusion molding. FIG. 3 is a cross-sectional view of the lid member in a state where the upper end portion of the rising portion is bent. FIG. 4 is a perspective view for explaining the heat treatment process of the outer can. FIG. 5 is a perspective view for explaining a process of housing the electrode body in the outer can. FIG. 6 is a view for explaining the process of inserting the lid member into the outer can, and is a perspective view with a part cut away. 7 to 9 are views for explaining a process of forming the linear deformation portion on the outer can. FIG. 7 is a perspective view, FIG. 8 is a sectional view, and FIG. It is a perspective view shown missing. 10 and 11 are diagrams for explaining a bending process of the upper end portion of the outer can by press working. FIG. 10 is a cross-sectional view, and FIG. 11 is a perspective view. 12 and 13 are diagrams for explaining a winding process by press working, in which FIG. 12 is a cross-sectional view and FIG. 13 is a perspective view. 14 and 15 are diagrams for explaining a flattening process of the tightening portion by press working, where FIG. 14 is a cross-sectional view and FIG. 15 is a perspective view.

This sealed battery is, for example, a sealed prismatic lithium battery, and the outer can has a flat prismatic shape in which both end portions on the side are rounded in a substantially semicircular shape.
In this sealed battery manufacturing method, an outer can made of an aluminum alloy is formed by impact extrusion molding (impact molding). In other words, a rectangular lump (slag) of an aluminum alloy, which is a metal material, is impact-extruded to form an outer can having a substantially uniform thickness. As shown in FIG. 1, the outer can (container) 1 is formed in a flat, rectangular, bottomed cylindrical shape in which both lateral end portions are rounded in a substantially semicircular shape.

On the other hand, the lid member 2 made of an aluminum alloy is formed by impact extrusion molding. That is, the lid member 2 is formed by impact extrusion molding a square lump (slag) of an aluminum alloy that is a metal material. As shown in FIG. 2, the lid member 2 is formed in a flat, rectangular, bottomed cylindrical shape in which both lateral end portions are rounded in a substantially semicircular shape. The lid member 2 includes a bottom portion 3 and a rising portion 4 rising from the outer peripheral edge portion of the bottom portion 3, and the thickness of the bottom portion 3 is formed to be thicker than the rising portion 4. Further, a stepped portion whose diameter is reduced on the lower side is formed on the outer peripheral surface of the bottom portion 3, whereby the lower portion of the outer peripheral surface of the bottom portion 3 is a concave portion 5 having a square cross-sectional shape.
After the impact extrusion molding, the lid member 2 is bent slightly in an arc shape inward at the upper end portion of the rising portion 4 by press working using a die as shown in FIG.

  Next, as shown in FIG. 4, using the high-frequency induction heating coils 6, 6, the end portion on the opening side of the outer can 1, which is a portion to be tightened later, and the lower side of the tightened portion are positioned. Then, the part where the linearly deformed part is formed later is simultaneously heated by high frequency induction heating, and then the heated part is air-cooled. The coiled portion is heated by the coil 6 arranged on the opening side of the outer can 1, and the linear deformation portion is heated by the coil 6 surrounding the outer periphery of the outer can 1 in the radial direction. Thus, by heat-treating (annealing) the work-hardening part at the time of impact extrusion molding, the plastic deformation and the winding process of the linear deformation part performed later are facilitated, and the press impact at the time of the winding process is reduced.

  Next, as shown in FIG. 5, the electrode body 7 is accommodated in the outer can 1. The electrode body 7 has a three-layer structure in which an insulating porous separator is sandwiched between a sheet-like positive electrode material and a negative electrode material, and has an elliptical structure. The electrode body 7 is impregnated with an electrolyte solution. This is hermetically sealed in a metal inner can. A terminal and a safety valve are provided on the upper surface of the inner can.

  Next, as shown in FIG. 6, the lid member 2 is inserted into the outer can 1. By engaging the head of the positioning member 8 inside the leading end portions of the rising portions 4 and 4 of the lid member 2, the lid member 2 is moved to a predetermined depth position in the outer can 1 by the positioning jig 8. Retained.

  Next, as shown in FIGS. 7 to 9, a linearly deforming portion extending in the lateral direction is formed in the outer can 1 so as to be recessed inward by plastic deformation. That is, as shown in FIGS. 7 and 8, by pressing the outer can 1 from both sides with a press die 10 having a convex portion 9 having a circular cross-sectional shape extending linearly in the lateral direction, The planar portions on both sides are recessed in an arc shape inward to form a linear deformation portion 11 extending linearly in the lateral direction as shown in FIG. The inner side of the linear deformable portion 11 is a convex portion 12 which is linear and has a circular cross section, and the outer portion is a groove portion 13 which is linear and has a circular cross section.

  The convex portions 12 on the inner side of the linear deformable portion 11 are inserted into straight portions on both sides of the bottom portion 3 of the concave portions 5 of the bottom portion 3 of the lid member 2. The press die 10 is composed of a pair of left and right dies 10a and 10a each having a predetermined width above and below the convex portion 9, and the inner side of the linear deformation portion 11 when the container 1 is pressed from both sides by the dies 10a and 10a. The convex portion 12 of the lid member 2 comes into contact with the concave portion 5 of the lid member 2, and the inner side surface of the opening portion of the container 1 on the upper side of the concave portion 5 comes into contact with or substantially contacts the outer side surface of the tightening portion of the lid member 2. It has become. As described above, the convex portion 12 of the outer can 1 is inserted into and brought into contact with the concave portion 5 of the lid member 2, whereby the lid member 2 is supported at a predetermined depth in the outer can 1. At this time, the bottom 3 of the lid member 2 is located between the two linear deformation portions 11 of the outer can 1. Since the lid member 2 is supported by the linear deformation portion 11, the positioning member 8 is removed thereafter.

  In addition, the linear deformation | transformation part 11 may be formed in the plane part of the both sides of the armored can 1 by arrange | positioning a roller on both sides of the armored can 1 which moves linearly, and pinching with this roller. If it does in this way, the exterior can 1 can be continuously sent from one direction between rollers, and the linear deformation | transformation part 11 can be formed.

Next, as shown in FIGS. 10 and 11, the upper end portion (end portion on the opening side) of the outer can 1 is bent inward in an arc shape by pressing.
That is, first, as shown in FIG. 10, the mold 15 is composed of a pair of left and right dies 16, 16, and each groove portion 13 of each linear deformation portion 11 of the outer can 1 is formed on each die surface 16 a of each die 16. The linear convex part 17 which can be fitted to is formed. The upper end of each mold 16 extends slightly above the convex portion 17. Then, both molds 16 and 16 of the mold 15 are brought close to each other and brought into contact with each other, and the mold surfaces 16 a and 16 a of both molds 16 and 16 are brought into close contact with the outer peripheral surface of the outer can 1. If it does in this way, each convex part 17 of each type | mold 16 will fit in each groove part 13 of each linear deformation part 11 of the armored can 1, and each convex part 17 will be pressed on each groove part 13. FIG. Thereby, the convex part 12 inside each linear deformation part 11 is pressed against the concave part 5 of the bottom part 3 of the lid member 2.

  Thereafter, the pressing die 22 having the recess 21 formed with the vertical surface (support surface) 21a and the pressing surface 21b having a circular cross section extending continuously from the upper end of the vertical surface 21a is lowered, and the lower end of the pressing die 22 is lowered. The upper end of the outer can 1 is pressed against the upper end of the mold 15. As a result, as shown in FIGS. 10 and 11, the upper surface of the outer can 1 is prevented from being deformed (buckled) outward (in the diameter-enlarging direction) by the vertical surface 21 a, while the outer surface of the outer can 1 is The upper end is bent slightly inwardly in an arc shape. The vertical surface 21a and the pressing surface 21b of the pressing die 22 are formed over the entire circumference along the upper end portion of the outer can 1 and are square-shaped in which both lateral end portions are rounded in a substantially semicircular shape in plan view. Is. When the pressing die 22 is pressed, each pressing portion 17 of the die 15 of the mold 15 presses the linear deforming portion 11 of the container 1 against the recessed portion 5 of the bottom portion 3 of the lid member 2 to press the pressing die 22. Pressure is supported. The lower surface of the outer can 1 is supported by being abutted against a support member (not shown).

Next, as shown in FIGS. 12 and 13, the upper end portion (end portion on the opening side) of the outer can 1 and the upper end portion of the rising portion 4 of the lid member 2 are tightened inward by pressing.
That is, first, as shown in FIG. 12, the mold 25 is composed of a pair of left and right molds 26, 26, and can be fitted to each groove 26 of each linear deformation portion 11 of the outer can 1. The convex part 27 is formed. The upper end of each mold 26 extends slightly above the convex portion 27. Then, both molds 26 and 26 of the mold 25 are brought close to each other and brought into contact with each other, and the mold surfaces 26 a and 26 a of both molds 26 and 26 are brought into close contact with the outer peripheral surface of the outer can 1. If it does in this way, each convex part 27 of each type | mold 26 will fit in each groove part 13 of each linear deformation part 11 of the exterior can 1, and each convex part 27 will be pressed on each groove part 13. FIG. Thereby, the convex part 12 inside each linear deformation part 11 is pressed against the concave part 5 of the bottom part 3 of the lid member 2.

  After that, it extends continuously from the vertical surface (support surface) 30 and the upper end of the vertical surface 30 and is formed in accordance with the shape after winding, and the cross-sectional shape is substantially semicircular in the arc portion and the central portion side. An upper end portion of the outer can 1 is lowered by lowering a pressing die 32 having a winding guide portion 31 including a vertical fastening portion 31 positioned and extending substantially vertically downward from the arc portion. And the rising part 4 of the lid member 2 is pressed. Accordingly, as shown in FIGS. 12 and 13, the upper end portion of the outer can 1 and the lid are prevented while the upper end portion of the outer can 1 is prevented from being deformed (buckled) outward (in the diameter-enlargement direction) by the vertical surface 30. The rising portion 4 of the member 2 is bent inward along the cross-sectional shape of the winding guide portion 31. That is, the upper end portion of the outer can 1 and the rising portion 4 of the lid member 2 are wound together inside. The vertical surface 30 and the winding guide portion 31 of the pressing die 32 are formed in a groove shape over the entire periphery along the upper end portion of the outer can 1 and the rising portion 4 of the lid member 2, and both ends on the lateral side in plan view. The portion is rounded in a substantially semicircular shape, and the inner side (center side) of the winding guide portion 31 is a protrusion 33.

  When the pressing die 32 is pressed, each pressing portion 27 of each die 26 of the mold 25 presses the linear deforming portion 11 of the container 1 against the recessed portion 5 of the bottom portion 3 of the lid member 2. Pressure is supported. The lower surface of the outer can 1 is supported by being abutted against a support member (not shown).

  In this tightening process, a plurality of stages (for example, three stages) are sequentially tightened into a predetermined shape. That is, the radius of curvature of the arc of the winding guide part 31 of the pressing die 32 is decreased stepwise, tightened to an acute angle stepwise, and tightened stepwise.

Next, as shown in FIGS. 14 and 15, the upper end portion (end portion on the opening side) of the outer can 1 and the upper tightening portion of the rising portion 4 of the lid member 2 are flattened by pressing.
That is, first, as shown in FIG. 14, the mold 35 is composed of a pair of left and right molds 36, 36, and can be fitted to each groove 36 of each linear deformation portion 11 of the outer can 1. The convex part 37 is formed. The upper end of each mold 36 extends slightly above the convex portion 37. Then, both molds 36 and 36 of the mold 35 are brought close to each other and brought into contact with each other, and the mold surfaces 36 a and 36 a of both molds 36 and 36 are brought into close contact with the outer peripheral surface of the outer can 1. If it does in this way, each convex part 37 of each type | mold 36 will fit in each groove part 13 of each linear deformation part 11 of the exterior can 1, and each convex part 37 will be pressed on each groove part 13. FIG. Thereby, the convex part 12 inside each linear deformation part 11 is pressed against the concave part 5 of the bottom part 3 of the lid member 2.

  After that, it extends continuously from the vertical surface (support surface) 40 and the upper end of the vertical surface 40, and is formed according to the shape after flattening, and the cross-sectional shape is small arc-shaped arc portion and the central portion side Then, the pressing die 42 formed with the pressing surface 41 composed of a vertical portion extending substantially vertically downward from the arc portion is lowered, the lower end thereof is butted against the upper end of the mold 35, and the upper end portion of the outer can 1 and The winding fastening part of the rising part 4 of the lid member 2 is pressed. As a result, as shown in FIGS. 14 and 15, the upper end portion and the lid of the outer can 1 can be prevented while the upper end portion of the outer can 1 is prevented from being deformed (buckled) outward (in the diameter expansion direction) by the vertical surface 40. The tightening portion of the rising portion 4 of the member 2 is crushed and flattened, and the adhesion of the tightening portion is improved. The vertical surface 40 and the pressing surface 41 of the pressing die 42 are formed over the entire circumference along the upper end portion of the outer can 1 and the tightening portion of the rising portion 4 of the lid member 2. The portion is rounded in a substantially semicircular shape, and the inner side (center side) of the pressing surface 41 is a protrusion 43.

  When the pressing mold 42 is pressed, each pressing portion 37 of each mold 36 of the mold 35 presses the linear deforming portion 11 of the container 1 against the recessed portion 5 of the bottom portion 3 of the lid member 2. Pressure is supported. The lower surface of the outer can 1 is supported by being abutted against a support member (not shown).

  In this flattening step, flattening in a plurality of stages may be sequentially performed to flatten to a predetermined shape.

  In such a sealed battery manufacturing method, the convex portion 27 provided on the mold 25 that is in close contact with the outer peripheral surface of the outer can 1 is pressed against the groove 13 outside the linear deformation portion 11 of the outer can 1. As a result, the convex portion 12 on the inner side of the linear deformable portion 11 is pressed against the concave portion 5 formed on the outer peripheral surface of the bottom portion 3 of the lid member 2, and is pressed by the pressing die 32 and tightened. The convex portion supports the pressing force of the pressing die 32 by the force pressing the linear deformation portion 11 of the container against the concave portion 5 on the outer peripheral surface of the bottom portion 3 of the lid member 2. Therefore, since the pressing force of the pressing die 32 acting on the portion of the outer can 1 below the linear deformable portion 1 is reduced, deformation and dimensional deviation of this portion can be prevented, so that the outer can 1 Damage to the inner electrode body 7 can be prevented. Thus, in this sealed battery manufacturing method, pressing by the pressing die 32 for tightening can be easily performed without separately installing a metal fitting or the like for receiving the pressing force of the pressing die 32.

Further, since the convex portion 27 of the mold 25 thus supports the pressing force of the pressing die 32 by the force pressing the linear deformation portion 11 of the outer can 1 against the concave portion 5 on the outer peripheral surface of the bottom portion 3 of the lid member 2, The lid member 2 is not dropped from the linear deformation portion 11 of the outer can 1 by the pressing force of the pressing die 32.
Moreover, since the linear deformation part 11 should just be formed by plastic deformation in the armored can 1, the thickness of the armored can 1 can be made constant, and in order to form a thin tightening part like the past, it may be carried out several times. Since it is not necessary to perform the drawing process or the like, the labor of the process can be reduced.

  Further, in the step of bending the upper end (opening end) of the outer can 1 in an arc shape and the step of flattening the tightening portion, the convex portions 17 and 37 of the molds 15 and 35 are respectively provided in the outer case. Since the pressing force of the pressing die 32 is supported by the force pressing the linear deformation portion 11 of the can 1 against the concave portion 5 on the outer peripheral surface of the bottom portion 3 of the lid member 2, the pressing dies 22, 42 are the same as in the winding process. Can be easily performed, and the lid member 2 is not dropped from the linear deformation portion 11 of the outer can 1 by the pressing force of the pressing dies 22 and 42.

  Further, since the thickness of the bottom 3 of the lid member 2 is increased, it is possible to cope with the force with which the linear deformable portion 11 of the outer can 1 is pressed against the bottom 3.

  Further, since the outer can 1 and the lid member 2 are each formed by impact extrusion molding, the processing is simple. Furthermore, since the lid member 2 is formed by impact extrusion molding, the bottom portion 3 can be easily processed so as to be significantly thicker than the rising portion 4.

  In the above-described embodiment, the linear deformation portion 11 is formed in a linear shape, but is not limited thereto, and may be formed in a curved shape or a combination of a linear shape and a curved shape, or may be partially upward or It may be protruded downward. In short, it is only necessary that the concave portion 5 of the lid member 2 is pressed and supported by the linear deformation portion. In the above-described embodiment, the linear deformation portion 11 is formed continuously, but may be formed intermittently.

In the above-described embodiment, the concave portion 5 of the lid member 2 is formed at the same time as the impact extrusion molding. However, the concave portion 5 may be formed by cutting after the molding.
In the above-described embodiment, the lid member 2 is made of a metal such as an aluminum alloy. However, the lid member 2 may be made of a synthetic resin or the like, or may be made of a metal and a synthetic resin. Good.
In the above-described embodiment, the concave portion 5 of the lid member 2 is formed by the stepped portion. However, the present invention is not limited to this, and the concave portion is formed as a recess in the middle of the outer peripheral surface of the lid member 2 in the vertical direction. May be.

In the above-described embodiment, the bottom portion 3 of the lid member 2 is formed in a flat bottomed cylindrical shape, but may be formed in other shapes such as a flat plate shape.
In the above-described embodiment, the outer can 1 is a so-called square container, but the present invention can be applied to other shapes such as a round shape and an oval shape.

In the above-described embodiment, the case of single-winding tightening (bending) has been described. However, the present invention can also be applied to double-winding tightening. Moreover, although the above-mentioned embodiment demonstrated the case where it winds up inside, it can apply also when it winds up outside.
Moreover, in the above-mentioned embodiment, although winding was performed over the perimeter of the opening part of the container 1, you may make it partially wind.

In the above-described embodiment, flattening is performed after winding, but the flattening step may be omitted.
Moreover, in the above-mentioned embodiment, although the process of bending the upper end part (end part on the opening side) of the outer can 1 and the tightening process were performed separately, the mold was devised, etc. in one process. You may make it carry out continuously.

  In the above-described embodiment, the pressing dies 22, 32, and 42 are pressed against the dies 15, 25, and 35, respectively. However, the pressing dies 22, 32, and 42 are respectively pressed into the dies 15, You may make it press in 25,35.

  Further, in the above-described embodiment, a sealing member such as a gasket is not used at the time of tightening, but a sealing member may be used for the tightening portion. The seal member includes a sealant to be applied in addition to the gasket.

  In the above-described embodiment, the case where the method of fixing the lid member to the container of the present invention is applied to the method of sealing (sealing) the outer can in the manufacturing method of the sealed battery has been described. However, the present invention can be applied to a method for sealing (sealing) a container in a method for manufacturing a metal hermetic container, and further to a method for fixing a lid member to a container that does not require sealing performance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a method for manufacturing a sealed battery according to an embodiment of the present invention, and FIG. 1 is a perspective view of an outer can in a state formed by impact extrusion molding. It is a perspective view of the lid member in the state formed by impact extrusion molding. It is sectional drawing of the cover member of the state by which the upper end part of the standing part was bent similarly. It is a perspective view for demonstrating the heat processing process of an exterior can. It is a perspective view for demonstrating the process of accommodating an electrode body in an exterior can. It is a figure for demonstrating the process of inserting a cover member in an exterior can, and it is a perspective view which notches and shows a part. It is a perspective view for demonstrating the process of forming a linear deformation part in an exterior can. It is sectional drawing for demonstrating the process of forming a linear deformation part in an exterior can. It is a figure for demonstrating the process of forming a linear deformation part in an armored can same, Comprising: It is a perspective view shown notching some. It is sectional drawing for demonstrating the bending process process of the upper end part of the armored can by press working. It is a perspective view for demonstrating the bending process process of the upper end part of the armored can by a press process. It is sectional drawing for demonstrating the winding process by press work similarly. It is a perspective view for demonstrating the winding process by press work similarly. It is sectional drawing for demonstrating the flattening process of the winding fastening part by a press work similarly. It is a perspective view for demonstrating the flattening process of the winding fastening part by a press work similarly. It is sectional drawing for demonstrating the conventional winding method.

Explanation of symbols

1 Exterior can (container)
2 Lid member 3 Bottom part 4 Standing part 5 Concave part (step part)
DESCRIPTION OF SYMBOLS 11 Linear deformation part 12 Convex part 13 Groove part 15 Mold 27 Convex part 32 Push mold

Claims (5)

At the time of fixing the lid member provided with the rising portion rising from the bottom and the outer peripheral edge of the bottom to the opening of the metal container by tightening ,
The lid member is inserted into the container, the rising portion of the lid member is overlaid on an end portion on the opening side of the container, and pressed by a pressing die, and the end portion of the opening portion of the container and the container In the method of fixing the lid member to the container by winding the rising part of the lid member together inside or outside,
The container is shaped like a flat bottomed cylinder that is long in the lateral direction, and a flat portion formed between the lateral ends of the container in a pair of planar shapes,
After the lid member is inserted into a predetermined position in the opening of the container, a pair of pressing dies having a protruding part extending in the lateral direction is used, and the protruding part of the pressing mold is used in the container in the container. By pressing each flat part inside by the convex part toward the concave part formed on the outer peripheral surface of the bottom part of the lid member,
Only a pair of the flat portions of the container is formed with a linearly deforming portion extending in the lateral direction recessed inward by plastic deformation, and is closely attached to an outer peripheral surface of the container in a groove portion outside the linear deforming portion. by pressing the convex portion provided in the mold, the lid of the inner convex portion of said wire-like deformed portion, is pressed against the concave portion of the lid member, to the container which is characterized in that the pressing by the pressing mold Fixing method of member.   The method for fixing a lid member to a container according to claim 1, wherein the concave portion of the bottom portion of the lid member is configured by a stepped portion having a reduced diameter on the lower side.   The method for fixing a lid member to a container according to claim 1 or 2, wherein the container and / or the lid member is formed by impact extrusion molding.   A metal sealed container manufactured using the method for fixing a lid member to a container according to any one of claims 1 to 3.   A sealed battery manufactured using the method for fixing a lid member to a container according to any one of claims 1 to 3.

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