JPH08153519A - Winding device for electrode and insulating sheet of rectangular battery, and manufacture of rectangular battery - Google Patents

Abstract

PURPOSE: To enable electrodes and separators to be removed from a core and be easily put in a battery case by winding the electrodes and insulating sheets on the core of a holding member, and causing an apparent decrease in the cross-sectional area of the core when the electrodes and the insulating sheets are to be removed. CONSTITUTION: A winding device 10 has a holding member 12 and a core 14. The holding member 12 is disc-shaped, and the core 14 is provided perpendicular to the member 12. The core 14 is almost rhomboid when seen from arrow X. The core 14 has a groove 20 formed between its first member 16 and second member 18. The members 16, 18 have respective acute angles 22, 24 opposite to each other. Electrodes and separators for a rectangular battery are wound on the core 14. The electrodes 30 consist of a positive sheet 32 and a negative sheet 34. The separators 36, 38 are insulating sheets used to insulate the sheets 32, 34 from each other. A complex metal oxide of Li ions and a specific metal is used as active material in the sheet 32. A specific carbonaceous material is used in the sheet 34. When the core 14 is to be drawn out from the battery contents 44 being wound, the groove 20 narrows and therefore decreases in cross-sectional area, allowing the contents 44 to be easily removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding device for winding an electrode and an insulating sheet for a prismatic battery such as a lithium prismatic battery, and a method for manufacturing the prismatic battery.

[0002]

2. Description of the Related Art In recent years, lithium ion secondary batteries have been receiving attention. A lithium ion secondary battery uses a non-aqueous electrolytic solution in which a carbonaceous material capable of doping and de-doping lithium is used as a negative electrode, a composite oxide of lithium and a transition metal is used as a positive electrode, and an electrolyte is added to a non-aqueous solvent. Non-aqueous electrolyte secondary battery. The lithium-ion secondary battery is a rechargeable battery and can be used to extend the driving time of a mobile phone, a mini disk player, a camera-integrated VTR, a portable personal computer, etc. It is seen as a promising candidate for the next generation to replace the conventional nickel-cadmium battery. Inside the case of the prismatic battery, a sheet-shaped positive electrode and a negative electrode are separated by a separator and spirally wound using a cylindrical shaft core 1 as shown in FIG. Then, as shown in FIG. 19, it is crushed from both sides in the direction of arrow P to be molded so that it can be inserted into the case of the prismatic battery.

[0003]

However, in the spirally wound electrode and separator 2 using the cylindrical shaft core 1 as described above, the central portion 3 is loosened as shown in FIG. In addition, since the electrode and the separator 2 are spirally wound around the shaft core 1 in FIG. 18, it cannot be easily removed and it takes time. Therefore, the present invention has been made in order to solve the above problems, the electrode and the separator can be removed from the winding core, and further, the electrode and the separator are crushed in a spirally wound state to form a rectangular battery case. It is an object of the present invention to provide a device for winding an electrode of a prismatic battery and an insulating sheet that can be easily inserted, and a method for manufacturing the prismatic battery, when the battery is to be inserted.

[0004]

In order to achieve the above object, according to the invention described in claim 1, for winding an insulating sheet arranged between an electrode and the electrode so as to be housed in a case having a rectangular cross section. A rectangular battery electrode and insulating sheet winding device comprising a holding member and a winding core held by the holding member and having a substantially rectangular cross section for winding the electrode and the insulating sheet. This is achieved by a winding device for an electrode and an insulating sheet of a prismatic battery, which includes the wound electrode and the winding core whose apparent cross-sectional area is reduced when the insulating sheet is taken out. According to the invention of claim 2,
A winding device for an electrode and an insulating sheet of a rectangular battery for winding an insulating sheet arranged between an electrode and the electrode so as to be housed in a case having a rectangular cross section, which includes a holding member and a holding member. A core having an acute diagonal for winding the electrode and the insulating sheet, the core having an apparently reduced cross-sectional area when the wound electrode and the insulating sheet are taken out. And the winding device for the electrodes of the prismatic battery and the insulating sheet. In the invention according to claim 3, preferably, the winding core has a line-symmetrical shape with respect to a line connecting the diagonals. In the invention according to claim 4, preferably, there is provided a drive means for apparently reducing the cross-sectional area of the winding core. In the invention according to claim 5, preferably, the winding core moves in an opening direction when the electrode and the insulating sheet are wound,
When the wound electrode and the insulating sheet are taken out, they move in the closing direction. According to the invention of claim 6,
Winding an insulating sheet arranged between the electrode and the electrode on the winding core, and taking out the wound electrode and the insulating sheet apparently reduced in cross-sectional area of the winding core from the winding core And a step of applying pressure to the taken-out electrode and the insulating sheet to form a substantially flat plate shape, which is achieved. Claim 7
In the invention described in (1), preferably, the method further comprises the step of putting the substantially flat plate-shaped electrode and the insulating sheet in a rectangular case.

[0005]

According to the above structure, in the first aspect of the invention, the electrode and the insulating sheet are wound around the winding core of the holding member. When the wound electrode and the insulating sheet are taken out, the winding core apparently has a reduced cross-sectional area, so that the wound electrode and the insulating sheet can be easily taken out. Moreover, since the winding core has a substantially rectangular cross section, the taken-out wound electrode and insulating sheet can be easily accommodated in a rectangular case. According to the second aspect of the invention, the electrode and the insulating sheet are wound around the core of the holding member. When the wound electrode and the insulating sheet are taken out, the winding core apparently has a reduced cross-sectional area, so that the wound electrode and the insulating sheet can be easily taken out. Moreover, since the winding core has an acute diagonal, the taken-out wound electrode and insulating sheet can be easily accommodated in a rectangular case. In the invention according to claim 3, preferably, when the winding core has a line-symmetrical shape with respect to a line connecting the diagonals, the electrode and the insulating sheet can be wound symmetrically. In the invention according to claim 4, preferably, the driving means for apparently reducing the cross-sectional area of the winding core apparently reduces the cross-sectional area of the winding core when the electrode and the insulating sheet are taken out. . Thereby, the wound electrode and the insulating sheet can be easily taken out. In the invention according to claim 5, preferably, the winding core moves in an opening direction when the electrode and the insulating sheet are wound, and moves in a closing direction when the wound electrode and the insulating sheet are taken out. To do. Thereby, the wound electrode and the insulating sheet can be easily taken out. According to the invention of claim 6,
An insulating sheet placed between the electrode and the electrode is wound around the winding core, the apparently reduced cross-sectional area of the winding core and the wound electrode and insulating sheet are taken out from the winding core, and Apply pressure to make a plate. This allows
The wound electrode and insulating sheet can be easily taken out. In the invention according to claim 7, preferably, the further taken out substantially flat plate-shaped electrode and the insulating sheet are put in a rectangular case.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The examples described below are
Since it is a preferred specific example of the present invention, various technically preferable limitations are attached, but the scope of the present invention is, unless otherwise stated to limit the present invention, in the following description.
It is not limited to these modes.

Embodiment 1 FIG. 1 is a perspective view showing a preferred embodiment of a winding device for an electrode and an insulating sheet of a prismatic battery of the present invention. The winding device 10 in FIG. 1 has a holding member 12 and a winding core 14. The holding member 12 is, for example, a disk-shaped member, and the winding core 14 is provided upright with respect to the holding member 12.
The winding core 14 has a substantially rhombic shape when viewed from the arrow X. The winding core 14 has a first member 16 and a second member 18, and a groove 2 is provided between the first member 16 and the second member 18.
0 is formed. The first member 16 has an acute diagonal 22
And the second member 18 has an acute diagonal 24. The diagonals 22, 24 are a set of opposing corners.
The first member 16 and the second member 18 of the winding core 14 open in the opening direction (arrow Y direction) by elastic deformation and close in the closing direction (arrow Z).
Direction). FIG. 2 shows an example of an electrode and a separator for a prismatic battery. The electrode and separator for the prismatic battery shown in FIG. 2 are wound around this winding core 14. The electrode 30 includes a positive electrode sheet 32 and a negative electrode sheet 34. The separators 36 and 38 are insulating sheets for electrically insulating the positive electrode sheet 32 and the negative electrode sheet 34. The positive electrode sheet 32 and the negative electrode sheet 34 are formed by stacking reaction materials (active materials). The positive electrode sheet 32 is
For example, a composite metal oxide composed of lithium ions and a specific metal is used as an active material. A specific carbonaceous material is used for the negative electrode sheet 34, for example.

Both the positive electrode sheet 32 and the negative electrode sheet 34 contain lithium Li in an ionic state and have low reactivity with air and moisture. The positive electrode lead 32 is provided on the positive electrode sheet 32.
Is provided. Contents 44 composed of the positive electrode sheet 32, the negative electrode sheet 34, and the separators 36 and 38 described above.
Is wound as shown in FIG. It is the winding core 14 of FIG. 1 that the contents 44 are wound as shown in FIG.

An example of the operation for winding the contents 44 as shown in FIG. 3 is shown in FIGS. 6 to 10. In FIG. 6, the winding core 14 is in the initial state. Ie diagonal 2
2 and 24 are along the reference line BL. Separator 36,
38 passes through the groove 20 between the first member 16 and the second member 18 via the supply roller 50 and reaches the take-up roller 52 side. From the initial state of FIG. 6, as shown in FIG.
The winding core 14 rotates 90 °. Thereby, the separator 36
Begins to wind along the first and second members 16,18.
FIG. 8 shows a state in which the winding core 14 is further rotated by 90 °,
FIG. 9 shows a state of being rotated by 270 ° from the reference line BL. As shown in FIG. 10, when the winding core 14 rotates by 360 °, the separator becomes the first and second members 16 and 18.
Is wound once on the outer peripheral surface.

At the time of FIG. 10, for example, the positive electrode sheet 32.
Are involved at the same time. This allows one separator 3
6 and the positive electrode sheet 32 are rolled up. Further, the procedure for winding the negative electrode sheet 34 and the insulating sheet 38 shown in FIG.
It is the same as the winding procedure shown in FIG. The electrode 30 and the insulating sheets 36 and 38 wound in this manner are shown in FIG.
The content 44 has a shape as shown in FIG. For example, by pulling while holding the holding means 12, the winding core 14 is pulled out from the wound electrode 30 and the insulating sheets 36 and 38. The electrode 30 and the insulating sheets 36 and 38 that have been pulled out are pressed by applying pressure P from both sides as indicated by an arrow B in FIG. In this case,
At the center of the rolled contents, there is an insulating sheet so that no cavity is opened inside. The contents 44 crushed as shown in FIG. 4 are inserted into the inside 60 of the rectangular battery case C shown in FIG. Then add the electrolyte.

By the way, when the contents 44 composed of electrodes and separators are formed by the winding core 14 of FIG. 1 as shown in FIG. 3, the first member 16 and the second member 18 as shown in FIG. The core 14 is located in the opening direction Y, and the cross-sectional area of the winding core 14 is apparently wide. On the contrary,
As described above, when the winding core 14 of the winding device 10 of FIG. 1 is pulled out from the contents 44 in the wound state as shown in FIG. 3 and removed, a groove is formed between the first member 16 and the second member 18. Since 20 is provided, the first member 16 and the second member 18
The elastically deformed end of the free end of the arrow narrows in the direction of arrow Z, which is the closing direction. That is, since the apparent cross-sectional area of the first member 16 and the second member 18 is reduced, the contents 44 can be easily removed from the winding core 14 without losing the shape of the contents 44.

Embodiment 2 FIG. 11 shows another embodiment 2 of the winding device of the present invention. In Example 2 of FIG. 11, the winding device 110 includes a holding member 112 and a winding core 114. Holding member 11
2 is a disk-shaped member. The winding core 114 includes the first member 1
It has 16 and the 2nd member 118, and defines the substantially rhombus shape seeing from the arrow X direction. The diagonal 122 of the first member 116 and the diagonal 124 of the second member 118 are both acute angles. A groove 120 is formed between the first member 116 and the second member 118. The first member 116 and the second member 118 of the winding core 114 are elastically deformed to open in the opening direction (arrow Y direction) and close in the closing direction (arrow Z direction).

A slit 116a is formed in the first member 116, and a slit 118a is formed in the second member 118. Thus, the groove 120 and the two slits 1
16a and 118a are formed, and the first member 116 and the second member 118 of the winding core 114 are adapted to be closed in the closing direction (direction of arrow Z), so that the contents are removed from the winding core 114. It can be removed even more easily. That is, when removing the contents 44 from the winding core 114, the first member 116 and the second member 118 move in the arrow Z direction.
That is, since the cross-sectional area of the winding core 114 is apparently small,
The contents 44 can be easily removed from the winding core 114.

Embodiment 3 FIG. 12 shows Embodiment 3 of the winding device of the present invention.
The winding device 210 has a holding member 212 and a winding core 214. The winding core 214 has a rectangular shape when viewed from the arrow X direction. The winding core 214 has a first member 216 and a second member 218. A groove 220 is formed between the first member 216 and the second member 218. Winding core 214
The first member 216 and the second member 218 are elastically deformed to open in the opening direction (arrow Y direction) and close in the closing direction (arrow Z direction).

Embodiment 4 FIG. 13 shows Embodiment 4 of the winding device of the present invention.
The winding device 310 of the fourth embodiment shown in FIG.
And a winding core 314. The winding core 314 has a first member 316 and a second member 318. First member 3
A groove 320 is formed between 16 and the second member 318. When viewed from the arrow X direction, the first member 316 has a diagonal 3
22 and the second member 318 has a diagonal 324. The diagonals 322 and 324 are acute angles. The first member 316 and the second member 318 of the winding core 314 are elastically deformed to open in the opening direction (arrow Y direction) and close in the closing direction (arrow Z direction).

Embodiment 5 FIG. 14 shows Embodiment 5 of the winding device of the present invention.
In FIG. 14, the winding device 410 has a holding member 412 and a winding core 414. The winding core 414 has a substantially elliptical shape when viewed from the direction of the arrow X, and includes the first member 416 and the second member 416.
Member 418. A groove 420 is formed between the first member 416 and the second member 418. The first member 416 is formed with a slit 416a, and the second member 418 is formed with a slit 418a. The first member 416 and the second member 418 of the winding core 414 are elastically deformed to open in the opening direction (arrow Y direction) and close in the closing direction (arrow Z direction). First member 41
6 has an acute diagonal 422, and the second member 418 has an acute diagonal 424.

Sixth Embodiment FIGS. 15 and 16 have a sixth embodiment of the winding device. In the embodiments of the winding device shown in the first to fifth embodiments, when the winding core of the winding jig is removed from the wound contents as shown in FIG. Since the second member is elastically deformed and the cross-sectional area of the winding core is apparently reduced, it can be easily removed.
On the other hand, in the sixth embodiment of FIGS. 15 and 16, the winding device 510 has the holding jig 512 and the four members 514a and 514b forming the winding core. Two members 514
a is at the corresponding position, and the remaining member 514b is also at the corresponding position. These four members 514a and 514b
Are arranged at four corners of a substantially rhombic shape when viewed from the direction of the arrow X. As shown in FIG. 16, the gear 591 is rotated by operating the driving means 590 such as a motor. As the gear 591 rotates, the member 514a moves in the direction of arrow R, and the remaining members 5
14b moves in the direction of arrow S.

Embodiment 7 FIG. 17 shows Embodiment 7 of the winding device of the present invention. In FIG. 17, the winding device 610 includes a holding member 612 and two members 614 that form a winding core. Member 61
4 is integrated with the rack 693. The rack 693 meshes with the gear 691. The gear 691 can be rotated by driving means 690 such as a motor. Drive means 690
The member 614 can be opened and closed in the direction of arrow S by driving. The present invention is not limited to the above embodiment. For example, in the first embodiment and the fifth embodiment, the driving means may be used to open and close the first member and the second member of the winding core. As the motor, it is possible to use a motor such as a linear motor in addition to an ordinary rotary motor.

[0019]

As described above, according to the present invention, the electrode and the separator can be removed from the winding core, and the electrode and the separator are crushed in a spirally wound state and placed in the case of the rectangular battery. When trying to do so, the central portion does not sag.

[Brief description of drawings]

FIG. 1 is a perspective view showing a preferred embodiment of a winding device of the present invention.

FIG. 2 is a perspective view showing an example of an electrode and a separator to be inserted into a prismatic battery case.

FIG. 3 is a plan view showing an example of a state in which an electrode and a separator are wound.

FIG. 4 is a diagram showing a state in which the electrodes and the separator of FIG. 3 are crushed.

5 is a perspective view showing an example of a case of a prismatic battery containing the crushed separator and electrodes of FIG. 4. FIG.

FIG. 6 is a diagram about to start winding the separator by the winding device according to the first embodiment of FIG. 1.

FIG. 7 is a diagram showing a state in which the winding core is rotated by 90 ° from the state of FIG. 6;

FIG. 8 is a diagram showing a state in which the winding core is rotated 180 ° from the state of FIG. 6;

FIG. 9 is a view showing a state in which the winding core is rotated by 270 ° from the state of FIG. 6;

FIG. 10 is a view showing a state in which the winding core is rotated by 360 ° from the state of FIG.

FIG. 11 is a perspective view showing a second embodiment of the winding device of the present invention.

FIG. 12 is a perspective view showing a winding device according to a third embodiment of the invention.

13 is a perspective view showing Embodiment 4 of the winding device of the present invention. FIG.

FIG. 14 is a perspective view showing a winding device according to a fifth embodiment of the invention.

FIG. 15 is a perspective view showing Embodiment 6 of the winding device of the present invention.

16 is a perspective view of the winding jig of Example 6 of FIG. 15 seen from the back side.

FIG. 17 is a perspective view showing a winding device according to a seventh embodiment of the present invention.

FIG. 18 is a schematic plan view showing a state in which a conventional electrode and a separator are wound.

FIG. 19 is a view showing a state where the separator and the electrode of FIG. 18 are crushed in the direction of arrow P.

[Explanation of symbols]

 10 Winding device 12 Holding member 14 Winding core 16 First member 18 Second member 20 Groove 22 Diagonal 24 Diagonal 30 Electrode 32 Positive electrode sheet 34 Negative electrode sheet 36, 38 Separator (insulating sheet) 44 Contained in square battery Contents

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 7, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 16

[Correction method] Change

[Correction content]

FIG. 16

Claims (7)

[Claims] 1. A winding device for an electrode and an insulating sheet of a rectangular battery for winding an electrode and an insulating sheet arranged between the electrode so as to be housed in a case having a rectangular cross section, the holding member comprising: A core that is held by the holding member and has a substantially rectangular cross section for winding the electrode and the insulating sheet, and an apparent cross-sectional area when the wound electrode and the insulating sheet are taken out. The winding device for winding the electrodes and the insulating sheet of the prismatic battery, comprising: 2. A winding device for an electrode and an insulating sheet of a rectangular battery for winding an electrode and an insulating sheet arranged between the electrodes so as to be housed in a case having a rectangular cross section, and a holding member, A core which is held by the holding member and has an acute diagonal for winding the electrode and the insulating sheet,
A winding device for an electrode and an insulating sheet of a prismatic battery, comprising: the wound electrode; and the winding core whose apparent cross-sectional area is reduced when the insulating sheet is taken out. 3. The winding device for an electrode and an insulating sheet of a prismatic battery according to claim 2, wherein the winding core has a shape symmetrical with respect to a line connecting the diagonals. 4. The winding device for an electrode and an insulating sheet of a prismatic battery according to claim 2, further comprising driving means for apparently reducing the cross-sectional area of the winding core. 5. The winding core moves in an opening direction when the electrode and the insulating sheet are wound, and moves in a closing direction when the wound electrode and the insulating sheet are taken out. Item 3. A winding device for an electrode of a prismatic battery and an insulating sheet according to Item 2. 6. A step of winding an insulating sheet disposed between an electrode and the electrode around a winding core, the cross-sectional area of the winding core being apparently reduced, and the winding of the insulating sheet and the electrode. A method of manufacturing a prismatic battery, comprising: a step of taking out from a winding core; and a step of applying pressure to the taken out electrode and the insulating sheet to form a substantially flat plate shape. 7. The method for manufacturing a prismatic battery according to claim 6, further comprising the step of placing the substantially flat plate-shaped electrode and the insulating sheet in a prismatic case.