JP2008159352A - Method and device for manufacturing cylindrical cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a cylindrical cell with a housing volume of an anode material restrained from decreasing, by arranging an overlapping part of a cylindrical separator made up by being wound around in a cylindrical shape and a folded overlapping part of a folded corner part of a square-shaped bottom-part separator so as not to overlap each other, and suppressing reaction shortage of both electrodes by narrowing an interval between an anode material and a cathode material, in one housing the cylindrical separator and the bottom-part separator in a cell case of a bottomed cylindrical shape. <P>SOLUTION: In the manufacturing method of the cylindrical cell, a cathode material 2, an anode material 4, alkaline solution and a cylindrical separator 3 intercalated between the cathode material 2 and the anode material 4 as well as the bottom-part separator 5 are housed in the bottomed cylindrical-shape cell case 1, and it is so arranged that an overlapping part 3a of the cylindrical separator 3 made up by being wound around in a cylindrical shape and a corner part 5a of the square-shaped bottom-part separator 5 shall not overlap each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a manufacturing method and an apparatus for manufacturing a cylindrical battery in which the position of a separator interposed between a positive electrode material and a negative electrode material of a cylindrical battery typified by an alkaline manganese dry battery is improved.

  In recent years, there are many electronic devices that discharge large currents in portable information devices and digital cameras that require high load discharge performance. Demand for cylindrical batteries typified by alkaline manganese dry batteries, which are required as power sources for these electronic devices, is rapidly increasing. Accordingly, there is a demand for improvement in production efficiency of alkaline manganese batteries and production of high-quality, reliable, large-capacity, high-power cylindrical batteries.

  FIG. 9 shows the configuration of an alkaline manganese dry battery according to the prior art. An alkaline manganese battery has a cylindrical positive electrode material 104, a cylindrical cylindrical separator 101 and a square bottom separator 102, a gel negative electrode in a battery case 103 having a positive electrode convex portion 85 formed at the bottom of a cylindrical outer shape. The material 106 is accommodated, and the opening end of the battery case 103 is sealed with a sealing plate 88 through an insulating gasket 87, and the sealing plate 88 is connected to a negative electrode current collector rod 89 inserted into the gelled negative electrode material 106. Has been. A bottom separator 102 is provided at the bottom of the battery case 103, and a method of isolating the gel-like negative electrode material 106 and the battery case 103 serving as a positive electrode terminal so as not to be internally short-circuited has been proposed (for example, Patent Document 1).

  Moreover, the state diagram which shows the process procedure of the manufacturing apparatus which concerns on the structure of a conventional battery is shown to Fig.10 (a)-(c). As shown in FIG. 10A, a circular guide hole 114 through which the cylindrical separator 101 can be passed by the battery transport jig 110 through the battery case 103 in which the positive electrode material 104 has been inserted in the previous process, and a square shape above the guide hole 114. The separator loading jig 112 including the holding unit 111 that holds the bottom separator 102 is conveyed so that the central axis is on the same axis.

  Next, as shown in FIG. 10B, the cylindrical separator 101 wound twice in a cylindrical shape so as to be in contact with the inner peripheral surface of the positive electrode material 104 in the battery case 103 and the holding portion 111 of the separator loading jig 112. The bottom separator 102 held on the tip of the cylindrical separator 101 with the core 113 aligned with the separator loading jig 112, the core 113, and the battery case 103 using the core 113 is aligned on the same axis. Are brought into contact with the bottom separator 102, and both separators are simultaneously inserted into the battery case 103 through the guide hole 114.

Thereafter, as shown in FIG. 10 (c), both the separators 101 and 102 are disposed in the battery case 103 while the core 113 is raised, and the battery transfer jig 110 is moved to the next step (not shown). It is conveyed to. Thereafter, in the next step, a gelled negative electrode material is introduced into the central space surrounded by both separators 101, 102, and after pouring the electrolyte, the opening of the battery case 103 is sealed with a sealing plate to produce a cylindrical battery. A method has been proposed (see, for example, Patent Document 2).
Japanese Patent No. 3555211 Japanese Patent No. 3655469

However, in the prior art disclosed in the above-mentioned patent document, as shown in FIG. 9, the corners of the bottom separator 102 overlap the overlapping portions formed from the beginning and end of winding of the cylindrical separator 101, and the negative electrode material 106 and the positive electrode material 104 are overlapped. As a result, there is a problem that the required discharge performance cannot be obtained due to an increase in the distance between the electrodes and a shortage of reaction between the two electrodes, or a decrease in the capacity of the negative electrode material 106.

  As shown in the perspective view of the assembled state of the cylindrical separator 101 and the bottom separator 102 shown in FIG. 11, when the cylindrical separator 101 is partially wrapped with the bottom separator 102, the start and end of winding of the cylindrical separator 101 are performed. The overlapping portion 101 a where the two overlap each other and the bent corner portion 102 a of the bottom separator 102 overlap and become thick, and the negative electrode material 106 and the positive electrode material 104 shown in FIG. The gap between the gaps increases and a gap between the negative electrode material 106 and the positive electrode material 104 deteriorates. In addition, since the separators are overlapped by the overlapped portion 101a of the cylindrical separator 101 and the bent corner portion 102a of the bottom separator 102, the capacity of the negative electrode material 106 is reduced, and the required discharge performance is obtained. There was a problem that it was not possible.

  The present invention has been made in view of the above-described conventional problems. By disposing the overlapping portion of the cylindrical separator wound in a cylindrical shape and the corner portion of the rectangular bottom separator so as not to overlap, the negative electrode material In addition, since the distance between the positive electrode material and the negative electrode material through both separators is reduced, the variation in internal resistance can be suppressed, and the variation in discharge characteristics can be suppressed. It is an object of the present invention to provide a method for manufacturing a highly reliable, large capacity, high power cylindrical battery and its manufacturing apparatus.

  In order to achieve the above object, a method for manufacturing a cylindrical battery according to the present invention includes a positive electrode material formed in a cylindrical shape in a bottomed cylindrical battery case, and a rectangular bottom separator and a cylindrical cylindrical separator. In the method of manufacturing a cylindrical battery in which the electrolytic solution and the gelled negative electrode material are inserted, and then the opening of the battery case is sealed with a sealing plate equipped with a negative electrode current collector rod, the bottom separator and the cylindrical separator are simultaneously inserted. When positioning, the corner of the bottom separator is positioned and inserted after positioning so that the overlapping part consisting of the beginning and end of winding of the cylindrical separator formed into a cylindrical shape does not overlap the corner of the bottom separator. It is a feature.

  According to the present invention, the overlapping part of the cylindrical separator and the corner of the bottom separator are arranged so as not to overlap the overlapping part of the cylindrical separator and the corner of the rectangular bottom separator. Since the folded part does not overlap with the bent part, it is possible to suppress the decrease in capacity of the negative electrode material, and the distance between the positive electrode material and the negative electrode material is reduced, so that variation in internal resistance and discharge characteristics are improved, resulting in high capacity. High reliability can be obtained.

  In the first invention of the present invention, the positive electrode material formed in a cylindrical shape is housed in a cylindrical battery case with a bottom, and after inserting a rectangular bottom separator and a cylindrical cylindrical separator into an electrolyte and a gel In the method of manufacturing a cylindrical battery in which the negative electrode material is inserted and then the opening of the battery case is sealed with a sealing plate having a negative electrode current collector rod, the corner of the bottom separator is inserted when the bottom separator and the cylindrical separator are simultaneously inserted. The cylindrical separator overlaps the cylindrical separator by inserting it after positioning it so that the overlapping part consisting of the beginning and end of winding of the cylindrical separator formed in a cylindrical shape does not overlap the corner of the bottom separator. And the bent corners of the bottom separator do not overlap, reducing the capacity of the negative electrode material, and reducing the distance between the positive electrode material and the negative electrode material, reducing variations in internal resistance Is, it is possible to improve the discharge characteristics.

In the second invention of the present invention, the leading edge of the cylindrical separator is inserted into the peripheral edge of the bottom separator at the same time as the rising edge of the peripheral edge of the bottom separator is in contact with the inner peripheral surface of the positive electrode material formed into a cylindrical shape. By mounting it so that it wraps from the outside, the position of the bottom separator is shifted due to impact, vibration, etc., and internal short circuit due to contact between the negative electrode material and the battery case is suppressed, and the bottom surface side of the negative electrode material is the bottom separator only with the battery case. Since the gap is insulated, it is possible to suppress a decrease in the capacity of the negative electrode material and to discharge efficiently.

  In the third aspect of the present invention, as the bottom separator, the strip separator is cut and molded so that the lengths of the four sides have the same dimension, thereby eliminating the loss of cutting out of the bottom separator and improving the raw material yield. Is possible.

  In the fourth invention of the present invention, the positive electrode material formed into a cylindrical shape is housed in a cylindrical battery case with a bottom, and after inserting a rectangular bottom separator and a cylindrical cylindrical separator into an electrolyte and a gel In a cylindrical battery manufacturing apparatus in which the negative electrode material is inserted and the opening of the battery case is sealed with a sealing plate provided with a negative electrode current collector rod, a positioning part for positioning the supply part of the bottom separator and the corner part of the bottom separator is provided. The cylindrical separator supply section and the cylindrical separator and the bottom separator are positioned as a positive electrode material, positioning the cylindrical separator supply section and the cylindrical separator and the bottom separator so as not to overlap the corners of the bottom separator. The cylindrical separator is configured by an insertion portion that is simultaneously inserted into a battery case that houses the battery case, a transport portion that carries in the battery case that houses the positive electrode material, and a carry-out portion that carries out the battery case. Placed in a position that does not overlap with the corner portion of the positioning and bottom separator overlapping portion of the data it is possible to mount.

  In a fifth aspect of the present invention, as a supply unit for the bottom separator, a feeding roller for feeding the strip separator, a cutting blade roller for cutting the strip separator into a square, and a vacuum suction roller for sucking and transporting the cut bottom separator And a vacuum disk that has a vacuum suction lever, a vacuum unit that generates vacuum, and a drive unit that is a drive source, it is possible to cut out a square bottom separator from a strip separator, and the handling of the bottom separator is simple And production capacity can be improved.

  In the sixth aspect of the present invention, the bottom separator positioning portion includes a bottom separator holding portion provided in the bottom separator holding rotating disk and a guide for positioning the battery case. Positioning can be performed so as not to overlap the overlapping portion of the cylindrical separator while maintaining the positioned state, and reliable positioning is possible.

  In the seventh aspect of the present invention, the cylindrical separator supply section includes an unwinding section that supplies the strip separator and a cutting section that cuts the strip separator into a predetermined size. It is possible to cut a dimension at which the winding end of the cylindrical separator becomes the winding start position, and to form a reliable overlapping portion of the cylindrical separator without deviation.

  In the eighth aspect of the present invention, as a positioning portion of the cylindrical separator, a winding guide for guiding the cut strip separator to a winding start position, a winding core, a winding roller for winding the winding core, an insertion head rotating disk, and a driving unit By winding the cylindrical separator that has been cut in such a dimension that the end of winding of the cylindrical separator becomes the starting position when winding, the overlapping portion of the cylindrical separator is positioned at a predetermined position. Is possible.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. First, the configuration of an alkaline manganese battery that is a cylindrical battery according to an embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 1, a positive electrode convex portion 6 is formed on the bottom surface so as to protrude outward as a positive electrode terminal. A positive electrode material 2 formed in a cylindrical shape in contact with the surface is accommodated, and an electrolyte solution (not shown) and a gel-like negative electrode separated by a bottom separator 5 and a cylindrical separator 3 in the inner diameter direction of the positive electrode material 2 The material 4 is accommodated. The open end of the battery case 1 is sealed by a sealing plate 8 via an insulating gasket 7 and connected to a negative electrode current collector rod 9 inserted into a gelled negative electrode material 4 and attached to a sealing plate 8 serving as a negative electrode terminal. The alkaline manganese dry battery 10 is formed.

  Hereinafter, although the manufacturing method of the alkaline manganese battery in connection with one embodiment of this invention is demonstrated in detail, referring a figure, this invention is not limited only to these. First, as shown in FIG. 1, a powdered positive electrode mixture is formed in a battery case 1 formed with a bottomed cylindrical shape and provided with a positive electrode convex portion 6 formed on the bottom surface so as to protrude outward as a positive electrode terminal. Is inserted and housed in a state where it is in contact with the inner peripheral surface of the battery case 1. A plurality of cylindrical positive electrode materials 2 to be stored depending on the type of alkaline manganese dry battery are stored. In one embodiment of the present invention, two positive electrode materials 2 are stored in the battery case 1.

  The positive electrode material 2 was prepared by mixing a mixture of manganese dioxide and graphite in a weight ratio of 90:10 and an alkaline electrolyte in a weight ratio of 100: 3, sufficiently stirring, and then compression-molding into a flake shape. . In addition, 40% by weight sodium hydroxide aqueous solution is used as the alkaline electrolyte, and the flaky positive electrode mixture is pulverized and powdered and classified by sieving. The pelletized positive electrode material 2 was obtained by molding. Two of the positive electrode materials 2 were inserted into the battery case 1.

  Next, a strip-shaped separator having a width larger than the diameter of the cylindrical separator 3 is cut into a length having the same length as the width, that is, the bottom separator 5 formed into a square is formed at the center of the battery case 1 and the center of the bottom separator 5. Placed at the same position. Here, the corner 5a of the bottom separator 5 cut into a square is positioned at the time of cutting, and is placed on the battery case 1 while maintaining the positioned state. The bottom separator 5 uses regenerated cellulose as a microporous film that allows only ions to pass through, and laminates a nonwoven fabric made of chemical fibers on both sides, and the thickness is preferably 0.02 mm to 0.3 mm.

  In addition, a strip-shaped separator having a width that is the same as the dimension in the height direction of the cylindrical separator 3 is cut into a predetermined length, and is wound into a cylindrical shape using a winding core to produce the cylindrical separator 3. Here, the number of windings of the cylindrical separator 3 is determined by the type of alkaline manganese dry battery, and in the embodiment of the present invention, the cylindrical separator 3 having three windings is used.

  Furthermore, the length to cut | disconnect was cut | disconnected by the length which the winding start and winding end become the same position by winding 3 times. In addition, you may cut | disconnect after winding required number of times. In addition, similar to the bottom separator 5, the tubular separator 3 uses regenerated cellulose as a microporous film that transmits only ions, and a nonwoven fabric made of chemical fibers is laminated on both sides thereof.

  Next, it arrange | positions in the position where the center of the cylindrical separator 3 and the center of the battery case 1 and the bottom part separator 5 become the same. Here, the center of the cylindrical separator 3 and the center of the bottom separator 5 are made to coincide with each other, and the overlapping portion of the cylindrical separator 3 at the beginning and end of the winding is positioned so as not to overlap the corner 5a of the bottom separator 5. To place.

Further, by inserting the core around which the cylindrical separator 3 is wound in the direction of the opening of the battery case 1, as shown in FIG. 3, the rising portion 5d is formed by bending the lower portion of the cylindrical separator 3 at the periphery of the bottom separator 5. It can be mounted along the inner diameter of the cylindrical positive electrode material 2 housed in the battery case 1. The overlapping portion 5b of the bottom separator 5 that has been bent by approaching the corner portion 5a is mounted so that it does not overlap with the overlapping portion 3a of the tubular separator 3, thereby overlapping the tubular separator 3 that has been a problem in the prior art. It is possible to suppress the phenomenon in which the capacity of the negative electrode material 4 decreases due to the overlap of the portion 3a and the overlapping portion 5b of the bottom separator 5, and the distance between the positive electrode material 2 and the negative electrode material 4 through both separators is close. The variation in the internal resistance of the battery can be suppressed.

  In addition, since the center of the bottom separator 5 and the cylindrical separator 3 is inserted and attached without being displaced, the bottom separator 5 is squeezed with the center symmetrical, and the bottom of the battery case 1 is covered with the bottom separator 5. A short circuit with the positive electrode material 2 when the gelled negative electrode material 4 is filled in a later step is prevented.

  Thereafter, an electrolyte solution (not shown) is injected, and after the gelled negative electrode material 4 is inserted, an insulating gasket 7 is attached to the periphery, and a negative electrode current collecting rod 9 at the center of a sealing plate 8 serving as a negative electrode terminal. Is inserted into the negative electrode material 4 and attached to the opening of the battery case 1, the opening of the battery case 1 is bent inward, caulked, sealed, and sealed to produce an alkaline manganese dry battery 10.

  Note that the gelled negative electrode material 4 comprises sodium polyacrylate as a gelling agent, a 40 wt% aqueous sodium hydroxide solution as an alkaline electrolyte, and zinc powder as a negative electrode active material in a weight ratio of 1:33:66. Mixed.

  FIG. 2 shows a schematic diagram of a cylindrical battery manufacturing apparatus according to the present invention. About the structure shown below, an example of the manufacturing apparatus hung up in order to demonstrate this invention is shown, Comprising: This invention does not specify the structure and manufacturing apparatus of a cylindrical battery to the following.

  For example, FIG. 2 shows a manufacturing apparatus for supplying and inserting a cylindrical separator and a bottom separator of an alkaline manganese dry battery LR6 which is a cylindrical battery having a diameter of 14 mm and a height of 50 mm according to the present invention. In FIG. 2, the process of supplying the bottom separator 5 of the alkaline manganese dry battery manufacturing apparatus according to the present invention and the process of supplying the cylindrical separator 3 and simultaneously inserting the bottom separator 5 into the battery case 1 will be described.

  First, in the step of supplying the bottom separator 5, as the supply unit 52 of the bottom separator 5, a feed roller 27 that feeds the strip separator 18, a cutting roller 11 that cuts the strip separator 18, and a vacuum suction roller that holds the cut bottom separator 5 by suction. It consists of twelve.

  The cutting blade roller 11 has a disk shape and includes a plurality of cutting blades 11a allocated at equal intervals on the circumferential surface, and a plurality of vacuum holes for vacuum-sucking the bottom separator 5 on the circumferential surface of the disk-shaped vacuum suction roller 12 Is provided. A vacuum unit 40 that generates a vacuum connected to the vacuum suction roller 12, a cutting blade roller 11, and a drive unit 41 that synchronously drives the vacuum suction roller 12 to rotate are provided, and a vacuum is applied to the cutting blade 11 a of the cutting blade roller 11. The suction roller 12 was arranged vertically in parallel with the circumferential surface of the suction roller 12 in contact.

  Further, a clearance for entering the bottom separator 5 is provided on the circumferential surface of the vacuum suction roller 12 arranged perpendicularly to the U-shaped vacuum suction lever 13 for transporting the bottom separator 5 provided in the paper feed plate 14. 14 is disposed horizontally, and a vacuum unit 42 that generates a vacuum connected to the turntable 14 and a drive unit 43 that rotationally drives the turntable 14 are provided.

Further, the bottom separator holding rotary disk is parallel to the rotary disk 14 at a position where the center of the vacuum suction lever 13 provided in the rotary disk 14 and the center of the positioning part 17 of the bottom separator 5 built in the bottom separator holding rotary disk 28 overlap. 28 were arranged in parallel. Furthermore, as shown in FIG. 4, when the bottom separator 5 adsorbed on the lower surface of the vacuum suction lever 13 is inserted into the positioning portion 17 with the core 16 described in detail later, the vacuum suction lever 13 is in the same direction as the core 16 ( Since they rotate in the direction of the arrow in the figure, they are U-shaped so as not to interfere with each other. Further, as will be described later in detail, the positioning portion 17 is composed of an insertion hole 23, a holding portion 22, a guide hole 37, and a projection guide 21, as shown in FIG.

  Next, as shown in FIG. 2, in the step of supplying the cylindrical separator 3 and simultaneously inserting the bottom separator 5 into the battery case 1, the core 16 for forming the cylindrical separator 3 and the positioning portion 25 of the cylindrical separator 3. The disc-shaped insertion head rotating disc 15 having a plurality of discs is provided in the upper stage, and the disc-shaped bottom separator holding rotating disc 28 having a plurality of positioning portions 17 for determining and holding the position of the bottom separator 5 is provided in the middle level and the battery in the lower level. A turntable 51 for transporting the battery transport jig 24 in which the case 1 is housed is arranged on the same axis, and is configured by a drive unit 46 that applies rotational drive at the same rotational speed.

  Further, the center of the winding core 16 of the insertion head rotating disk 15, the center of the positioning part 17 of the bottom separator 5 in the bottom separator holding rotating disk 28, and the center of the battery case 1 housed in the battery transport jig 24 of the rotating disk 51. And also match the center of the vacuum suction lever 13 of the feeding disk 14.

  As a supply unit 53 that supplies the cylindrical separator 3 to the positioning unit 25 of the cylindrical separator 3 of the insertion head rotating disk 15, a feed unit 29 that supplies the strip separator 36 and a feed roller 29 that feeds the strip separator 36 are provided. A cutting portion 49 for cutting the separator 36 with a predetermined dimension was provided.

  Further, the positioning portion 25 of the cylindrical separator 3 provided in the insertion head rotating disk 15 is used for winding with the winding guide 19 for determining and guiding the winding start position of the winding core 16 and the strip separator 36 as shown in FIG. The winding roller 20 is composed of two pieces, and the winding core 16 has a step portion 26 that is enlarged by a size corresponding to the winding thickness of the cylindrical separator 3.

  Further, the positioning part 17 of the bottom separator 5 provided in the bottom separator holding rotary disk 28 positions the bottom separator 5 in the insertion hole 23 having a diameter smaller than the outer shape of the bottom separator 5 and the lower part of the insertion hole 23 as shown in FIG. The bottom part 5 accommodated in a flat state as it is is constituted by a holding part 22 which is a perfect circle having the same diameter as the diagonal line, a guide hole 37 leading to the holding part 22 and a protrusion guide 21 which determines the position of the battery case 1. The protrusion guide 21 at the tip is configured to be able to determine the position of the battery case 1 by being inserted into the opening end of the battery case 1.

  2 is provided below the bottom separator holding turntable 28 shown in FIG. 2, and includes a turntable 51 for carrying the battery carrying jig 24 containing the battery case 1. The carrying-in conveyor 45 which is a carrying-in part which carries in the battery transport jig | tool 24 which accommodated the battery case 1 which accommodated the battery case 1 in the carrying-in part 45 which carries in the tool 24 from the turntable 51 to the next process was connected.

(Embodiment 1)
Next, the manufacturing apparatus according to Embodiment 1 of the present invention will be described in more detail. In the step of supplying and holding the bottom separator 5, first, the belt-like separator 18 obtained by processing a non-woven fabric having a thickness of 0.2 mm and a width of 15 mm shown in FIG. And the vacuum suction roller 12.

The drive unit 41 is driven to rotate the cutting roller 11 and the vacuum suction roller 12 so as to be sandwiched between the cutting blades 11a and the vacuum suction roller 12 provided in the cutting blade roller 11 at equal intervals. Cut to a length of 15 mm to form a square bottom separator 5. The width of the strip separator 18 is the same as the width of the bottom separator 5 formed in a square shape, and is cut into the same length as the width dimension so that it becomes a square shape. There is no material loss and no chips are generated. can do.

  Further, the bottom separator 5 cut by the cutting blade 11 a of the cutting blade roller 11 was vacuum-sucked on the surface of the vacuum suction roller 12 by operating the vacuum unit 40. At that time, the rotational speed of the vacuum suction roller 12 is made faster than the feeding speed for feeding the belt-like separator 18, and the cut bottom separators 5 are transported at equal intervals without being connected. Can be transported.

  Next, the bottom separator 5 vacuum-sucked by the vacuum suction roller 12 is transported by the vacuum suction roller 12 to the delivery position of the vacuum suction lever 13 of the turntable 14. Thereafter, the vacuum unit 42 is operated and vacuum suction is performed while the state conveyed to the lower surface of the vacuum suction lever 13 is held, and then the driving unit 43 connected to the turntable 14 is operated to operate the bottom separator. The bottom separator 5 was conveyed to the position of the positioning portion 17 of the bottom separator 5 incorporated in the holding turntable 28.

  Further, in the positioning portion 17, as shown in FIG. 7A, the core 16 is lowered toward the bottom separator 5 that is vacuum-sucked on the lower surface of the vacuum suction lever 13, and the bottom separator 5 is held by the holding portion of the positioning portion 17. Insert into 22 and hold. At that time, in the step of inserting the cylindrical separator 3, the battery transport jig 24 that houses the battery case 1, which will be described in detail later, is waiting below the bottom separator holding rotary plate 28.

  Further, as shown in FIG. 7B, the bottom separator 5 is pushed by the winding core 16, and the corner 5 a of the bottom separator 5 is deformed upward by hitting the edge of the insertion hole 23 having a diameter smaller than that of the bottom separator 5. And inserted into the holding portion 22 having a diameter of 21 mm which is equal to the diagonal length of the bottom separator 5.

  After that, as shown in FIG. 7C, the height of the storage space of the holding portion 22 is configured such that the deformed corner portion 5 a of the bottom separator 5 can be restored, so that the insertion hole 23 is inserted into the space of the holding portion 22. The bottom separator 5 was held by the holding unit 22 in the original flat state. In addition, the battery transport jig 24 storing the battery case 1 waiting under the bottom separator holding rotating disk 28 is raised, and the opening of the battery case 1 is inserted into the protrusion guide 21 to position the battery case 1. After that, the core 16 was raised to the original position.

  Further, as shown in FIG. 7D, the corner 5a of the bottom separator 5 is held so that the center of the positioning portion 17 and the center of the bottom separator 5 automatically coincide with each other using the inner wall of the holding portion 22 as a guide.

  Since the insertion hole 23 is formed to be smaller than the inner diameter of the holding portion 22, the small and light bottom separator 5 jumps out of the holding portion 22 due to vibration or wind, and the corner 5 a of the bottom separator 5 on the inner wall of the holding portion 22. In order to suppress misalignment by guiding the position, the positioned state is maintained even in the situation where the bottom separator 5 accommodated in the holding part 22 is rotated. Further, since the bottom separator 5 is kept conveyed in the horizontal direction and is inserted by the winding core 16, the bottom separator 5 can be reliably inserted and held in the holding portion 22 of the positioning portion 17 without being displaced. .

  Next, in the step of supplying the cylindrical separator 3 shown in FIG. 2 and simultaneously inserting the bottom separator 5 into the battery case 1, the pellet-shaped positive electrode material 2 compression-molded into a hollow cylindrical shape in a separate step (not shown). The battery carrying jig 24 containing the battery case 1 with two inserted therein was carried to the turntable 51 by the carry-in conveyor 45.

  Further, as the supply unit 53 of the cylindrical separator 3, a strip separator 36 having a thickness of 0.2 mm and a width of 44 mm is fed by the feed roller 29 from the unwinding unit 48, and the strip separator 36 is fed to the positioning unit 25 of the insertion head rotating disk 15. Was cut into a length of 85 mm by the cutting part 49, and the tip of the strip separator 36 was inserted into the positioning part 25 of the insertion head rotating disk 15.

  Next, as shown in FIG. 8A, a gap corresponding to the thickness of the strip separator 36 is provided between the winding core 16 and the winding guide 19 in the positioning portion 25, and the tip of the strip separator 36 is formed in the gap. Inserted. Thereafter, the end face of the strip separator 36 is guided to the winding start position set at a position not overlapping the corner 5a of the bottom separator 5, and the winding roller 20 that rotates freely approaches the direction of the core 16 and winds. The end face of the strip-shaped separator 36 at the initial position is sandwiched between the winding roller 20 and the core 16 in the winding guide 19, the core 16 is rotated three times, and the strip-shaped separator 36 is placed below the step portion 26 of the core 16. After winding, the core 16 was stopped and the cylindrical separator 3 consisting of 3 rolls was formed.

  Further, the overlapping portion formed by the winding start and the winding end of the cylindrical separator 3 cuts the strip separator 36 at the cutting portion 49 so that the winding end is finished at the winding start position, and the winding start position is determined. The position where the winding ends is decided naturally. Note that after the necessary number of windings have been completed, the tubular separator 3 may be formed by detecting with a sensor and cutting the strip separator 36 with the cutting part 49.

  After forming the cylindrical separator 3, the winding roller 20 is released to lower the winding core 16 around which the cylindrical separator 3 is wound, and the bottom separator 5 held in a flat state on the holding portion 22 is used as the bottom surface of the battery case 1. Until the bottom separator 5 comes into contact.

  At this time, the cylindrical separator 3 is inserted into the battery case 1 in a state of being wrapped by the bottom separator 5, and inserted until the bottom separator 5 comes into contact with the bottom surface of the battery case 1 by being pushed by the step portion 26 of the winding core 16. The Further, the cylindrical separator 3 wound around the winding core 16 is held by the winding guide 19 so as not to loosen the winding, and the insertion hole 23 shown in FIG. 22, since it enters the positioning portion 17 including the guide hole 37 and is inserted into the positioned battery case 1, no loosening of the winding occurs.

  Further, since there is no deviation between the center of the bottom separator 5 and the core 16, the bottom separator 5 is squeezed symmetrically about the center and attached so as to cover the bottom of the battery case 1, so that a gel-like shape is formed in a later step. Short circuit with the battery case 1 and the positive electrode material 2 when the negative electrode material 4 is filled can be suppressed with high accuracy.

  After inserting the cylindrical separator 3 and the bottom separator 5 at the same time, the core 16 is raised to the original position as shown in FIG. 8B, and the battery case 1 is lowered together with the battery transport jig 24, as shown in FIG. The battery transport jig 24 storing the battery case 1 with the cylindrical separator 3 and the bottom separator 5 mounted thereon is transported to the next process by the carry-out conveyor 47.

  In the next step, as shown in FIG. 1, the electrolytic solution is injected into the battery case 1, the gel-like negative electrode material 4 is inserted, and the sealing plate 8 is attached to the opening of the battery case 1. The LR6 alkaline manganese dry battery 10 was produced by bending the opening of the inner side of the battery inward and crimping and sealing.

As shown in FIG. 3, the cylindrical separator 3 and the bottom separator 5 at this time wrap the lower part of the cylindrical separator 3 with a rising portion 5d obtained by bending the periphery of the bottom separator 5, and the gel is contained in the battery case 1 shown in FIG. The negative electrode material 4 and the bottom surface of the battery case 1 are isolated and insulated so as not to be internally short-circuited.

  Further, as shown in FIG. 3, the overlapping portion 5 b that is bent with the corner portion 5 a of the bottom separator 5 being bent is attached so as not to overlap the overlapping portion 3 a of the cylindrical separator 3. The overlapping part 5b of the part 3a and the bottom separator 5 does not overlap, and the problem that the capacity of the negative electrode material 4 is reduced can be suppressed, and the distance between the positive electrode material 2 and the negative electrode material 4 through both separators This reduces the variation in the internal resistance of the battery.

  As described above, the present invention is configured such that the overlapping portion formed by the beginning and end of winding of the cylindrical separator and the corner portion of the square bottom separator are positioned so as not to overlap, and the cylindrical separator is wrapped with the bottom separator. As a result, the folded overlap part consisting of the corners of the bottom separator does not overlap with the overlap part consisting of the start and end of winding of the cylindrical separator, and the bottom separator can be inserted with high accuracy, resulting in liquid leakage and internal short circuit. The stable supply of high-capacity and highly reliable cylindrical batteries and the stability of safety can be achieved without generating any problems.

  According to the present invention, the overlapping portion of the cylindrical separator and the corner portion of the bottom separator are configured so as not to overlap the overlapping portion of the cylindrical separator and the corner portion of the rectangular bottom separator. Can be prevented from decreasing the capacity of the negative electrode material, the distance between the positive electrode material and the negative electrode material is close, variation in internal resistance and discharge characteristics are improved, large capacity Thus, it is possible to obtain a high-quality and reliable cylindrical battery, which is useful as a power source for a large-current discharge device such as a portable information device or a digital camera that requires a high load discharge performance.

Half-cutaway sectional view of a cylindrical battery in an embodiment of the present invention The schematic diagram of the manufacturing apparatus in one embodiment of this invention The schematic diagram which shows the state which wrapped the cylindrical separator with the bottom part separator in embodiment of this invention. The perspective view which shows the state which inserts the bottom part separator in one embodiment of this invention in a positioning part. The schematic diagram of the positioning part of the cylindrical separator in one embodiment of this invention The schematic diagram of the positioning part of the bottom part separator in one embodiment of this invention (A) Schematic diagram showing the insertion state of the bottom separator in one embodiment of the present invention, (b) Schematic diagram showing the state when the bottom separator is inserted in the positioning part, (c) Holding the bottom separator in the positioning part Schematic diagram showing the state, (d) Plan view of the positioning part (A) The schematic diagram which shows the state at the time of cylindrical separator winding in one embodiment of this invention, (b) The schematic diagram which shows the state after insertion of the bottom part separator and a cylindrical separator Half cutaway cross-sectional view of a cylindrical battery in a conventional example (A) Schematic diagram showing the winding state of the cylindrical separator in the conventional example, (b) Schematic diagram showing the state when the bottom separator and the cylindrical separator are inserted, (c) Mounting of the bottom separator and the cylindrical separator Schematic diagram of time The schematic diagram which shows the state which wrapped the cylindrical separator with the bottom part separator in a prior art example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Battery case 2 Positive electrode material 3 Cylindrical separator 3a Overlapping part 4 Negative electrode material 5 Bottom part separator 5a Corner | angular part 5b Overlapping part 5d Rising part 6 Positive electrode convex part 7 Insulation gasket 8 Sealing plate 9 Negative electrode current collector 10 Alkaline manganese dry cell 11 Cutting blade roller DESCRIPTION OF SYMBOLS 11a Cutting blade 12 Vacuum suction roller 13 Vacuum suction lever 14 Feeding board 15 Insertion head rotary board 16 Core 17 Positioning part 18 Strip separator 19 Winding guide 20 Winding roller 21 Projection guide 22 Holding part 23 Insertion hole 24 Battery conveyance control Tool 25 Positioning part 26 Step part 27 Feeding roller 28 Bottom separator holding rotating disk 29 Feeding roller 36 Strip separator 40 Vacuum part 41 Driving part 42 Vacuum part 43 Driving part 45 Loading conveyor 46 Driving part 47 Unloading conveyor 48 Unwinding part 49 Cutting part 51 Turning machine 52 Supply unit 53 Supply unit

Claims (8)

  The positive electrode material formed into a cylindrical shape is housed in a bottomed cylindrical battery case, and after inserting the square bottom separator and the cylindrical tubular separator, the electrolyte and the gel negative electrode material are inserted, and then the battery In the method of manufacturing a cylindrical battery in which the opening of the case is sealed with a sealing plate having a negative electrode current collector rod, when the bottom separator and the cylindrical separator are inserted simultaneously, the corners of the bottom separator are positioned and cylindrical. A cylindrical battery manufacturing method, wherein the cylindrical battery is inserted after being positioned so that an overlapping portion formed of a winding start and a winding end of the formed cylindrical separator does not overlap with a corner portion of the bottom separator.   Inserting so that the rising edge of the peripheral edge of the bottom separator is in contact with the inner peripheral surface of the positive electrode material formed into a cylindrical shape, and simultaneously mounting the tip of the cylindrical separator so as to be wrapped from the outside by the rising edge of the peripheral edge of the bottom separator The method for manufacturing a cylindrical battery according to claim 1, wherein:   2. The method for manufacturing a cylindrical battery according to claim 1, wherein the bottom separator is formed by cutting a strip-shaped separator so that the lengths of the four sides have the same dimension.   A positive electrode material formed into a cylindrical shape is stored in a bottomed cylindrical battery case, and after inserting a square bottom separator and a cylindrical tubular separator, an electrolyte and a gel negative electrode material are inserted, and the battery case In the cylindrical battery manufacturing apparatus that seals the opening of the bottom separator with a sealing plate provided with a negative electrode current collector rod, the cylindrical separator has a supply part for positioning the bottom separator and a positioning part for positioning a corner of the bottom separator, A separator supply unit, a positioning unit that positions an overlapping portion formed by starting and ending winding of the cylindrical separator so as not to overlap a corner of the bottom separator, and the positioned cylindrical separator and the bottom separator are positive electrodes. It is characterized by comprising an insertion part for simultaneously inserting into a battery case containing a material, a transport part for carrying in the battery case containing the positive electrode material, and a carry-out part for carrying it out. A cylindrical battery manufacturing apparatus.   A feed roller having a feed roller for feeding the strip separator, a cutting blade roller for cutting the strip separator into a square, a vacuum suction roller for vacuum-sucking and transporting the cut bottom separator, and a vacuum suction lever as a supply unit for the bottom separator The apparatus for manufacturing a cylindrical battery according to claim 4, comprising: a vacuum unit that generates a vacuum; and a drive unit that is a drive source.   5. The cylindrical battery manufacturing method according to claim 4, wherein the bottom separator positioning portion includes a bottom separator holding portion provided in a bottom separator holding turntable and a guide for positioning the battery case. apparatus.   5. The cylindrical battery manufacturing apparatus according to claim 4, wherein the cylindrical separator supply unit includes an unwinding unit that supplies the strip separator and a cutting unit that cuts the strip separator into a predetermined size. .   The cylindrical separator positioning portion is composed of a winding guide for guiding the cut strip separator to a winding start position, a winding core, a winding roller for winding the winding core, an insertion head rotating disk, and a driving portion. The manufacturing apparatus of the cylindrical battery of Claim 4.

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