JP4189614B2 - Lithium ion secondary battery manufacturing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lithium ion secondary battery in which a positive electrode sheet and a negative electrode sheet are laminated and wound through a separator using a pair of electrode leads, and the wound body is housed and enclosed in a battery case together with an electrolytic solution. In particular, the present invention relates to an apparatus for manufacturing a lithium ion secondary battery in which a wound body can be easily and smoothly taken out by a winding means for forming the wound body.
[0002]
[Prior art]
Today, lithium ion secondary batteries have a high capacity, a high voltage and a high energy density, and therefore the demand thereof tends to increase.
[0003]
Therefore, the lithium ion secondary battery is composed of a positive electrode using a lithium transition metal oxide as a positive electrode active material, a negative electrode using a carbon material as a negative electrode active material, and an organic solvent-based electrolyte. Are known.
[0004]
However, conventionally, when manufacturing the lithium ion secondary battery, a positive electrode sheet provided with an electrode lead and a negative electrode sheet provided with an electrode lead are laminated on each other via a separator made of polypropylene, for example, and wound. Then, a wound body as a required secondary battery is formed. In this case, the positive electrode sheet has a configuration in which a paste-like positive electrode active material mainly composed of a powder of lithium-metal composite oxide, for example, LiNiO ₂ or LiCoO ₂ is applied to both surfaces of a sheet made of metal such as aluminum foil. Is used. Moreover, as a negative electrode sheet, what consists of the structure which apply | coated the paste-form negative electrode active material which has a carbonaceous powder material as a main body on both surfaces of sheets, such as copper foil, is used.
[0005]
The electrode lead is formed by using a rectangular conducting wire made of a conductive metal material such as aluminum or nickel and winding an insulating resin sheet made of polyethylene, polypropylene or the like around the rectangular conducting wire.
[0006]
The wound body configured in this manner is housed in a battery case made of metal such as iron or stainless steel, and the internal electrode made of the electrode lead and the external electrode are appropriately connected, and an electrolytic solution is enclosed. Then, a lithium ion secondary battery can be manufactured by performing the sealing treatment.
[0007]
[Problems to be solved by the invention]
However, in the manufacture of the above-described conventional lithium ion secondary battery, the positive electrode sheet provided with the electrode lead and the negative electrode sheet provided with the electrode lead are laminated and wound with each other through the separator, When forming a wound body as a secondary battery, a winding device configured to prepare a plurality of types of winding frames having a predetermined oval shape and to replace the winding frames as necessary. in use.
[0008]
However, in the conventional winding device, the winding frame is formed in an oval shape when the wound body is formed. Therefore, vibration is generated during winding, and workability is deteriorated. Not only is it necessary, but there is a problem that the quality of the wound body is lowered.
[0009]
Therefore, as a result of intensive studies and examinations, the present inventor formed an electrode lead having a predetermined length formed by winding an insulating resin tape on a rectangular wire forming an internal electrode of a lithium ion secondary battery. Using this electrode lead, a positive electrode sheet and a negative electrode sheet were laminated and wound through a separator. The wound body is housed and enclosed in a battery case together with an electrolytic solution to provide a multi-part winding shaft that can be adjusted in outer diameter when forming the wound body, and includes a separator together with a positive electrode sheet and a negative electrode sheet. Winding means for forming a wound body is provided while sequentially supplying the windings. The winding means moves forward and backward in the gap between the winding shafts in opposition to the multi-split winding shaft of the winding means and is separated in parallel to each other in the horizontal direction. An extraction means provided with a pair of extraction rods approaching each other was arranged. In addition, when a required winding body is formed on the multi-split type winding shaft, the take-out rod is inserted into the gap of the multi-split mold winding shaft and the winding body is taken out from the multi-split winding shaft. A pressing means for pressing the wound body into a flat shape while the take-out rods are separated from each other is provided. It has been found that this problem can be solved in the apparatus for manufacturing a lithium ion secondary battery.
[0010]
Therefore, an object of the present invention is to easily and quickly remove the wound body formed into a cylindrical shape by the winding means and form the flat body into a flat shape with a simple apparatus configuration. An object of the present invention is to provide an apparatus for manufacturing a lithium ion secondary battery capable of mass-producing a secondary battery simply and at low cost.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, an apparatus for manufacturing a lithium ion secondary battery according to the present invention is an electrode having a predetermined length formed by winding an insulating resin tape around a rectangular wire forming an internal electrode of a lithium ion secondary battery. A lithium ion secondary battery formed by forming a lead, laminating and winding a positive electrode sheet and a negative electrode sheet through a separator using the electrode lead, and housing and enclosing the wound body together with an electrolytic solution in a battery case In the manufacturing apparatus, the winding body is provided with a multi-part winding shaft configured to be adjustable in outer diameter, and winding means for forming the winding body while sequentially supplying the separator together with the positive electrode sheet and the negative electrode sheet is provided. The take-out means includes a pair of take-out rods that move forward and backward in the gap between the roll shafts in opposition to the multi-division type winding shaft of the winding means and move away from each other in parallel in the horizontal direction. When the required winding body is formed on the multi-split winding shaft, the take-out rod is inserted into the gap of the multi-split winding shaft and the winding body is taken out from the multi-split winding shaft. In addition, there is provided press means for pressing the wound body into a flat shape while separating the take-out rods from each other.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a lithium ion secondary battery manufacturing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.
[0013]
1 to 3 show an embodiment of a manufacturing apparatus for a lithium ion secondary battery according to the present invention. FIG. 1 is a schematic explanatory view showing the configuration of the main part of the manufacturing apparatus, and FIG. FIG. 3 is a schematic explanatory view showing a state in which the wound body is pressed into a flat shape by a pressing means.
[0014]
In FIG. 1, reference numeral 10 denotes a winding means, 20 denotes a take-out means, and 30 denotes a pressing means. The winding means 10 has a configuration in which a multi-division type winding shaft 12 is coupled to one end of a support member 11 and a rotational drive shaft 13 is coupled to the other end, and the multi-division type winding shaft 12 is not shown respectively. Means for supplying a positive electrode sheet, a negative electrode sheet, and a separator are attached. As shown in FIG. 2, the multi-split winding shaft 12 is composed of cylindrical stainless steel winding shafts 12a, 12b, and 12c that are divided into a plurality of pieces (three in the illustrated example) in the axial direction. Appropriate gaps 14 are formed in the respective divided portions of the shaft, and an adjustment key 12d that can adjust the outer diameter (the inner diameter of the wound body 16) can be exchangeably attached to a part of the outer periphery. .
[0015]
Opposing to the tip of the multi-division type winding shaft 12 of the winding means 10, there is disposed an extracting means 20 having a pair of parallel extracting rods 22 and 22 protruding therefrom. The take-out means 20 is supported by a link mechanism 24 for separating and moving so that a pair of parallel take-out bars 22 and 22 can be separated from each other. It is held by an advancing / retreating movement support frame 26 configured to be able to move forward, enter and retreat with respect to the gap 14 of the shaft 12 and detach the winding body 16 from the multi-split winding shaft 12. The separation approaching / moving link mechanism 24 is configured such that the pair of take-out rods 22 and 22 can be separated and approached by the separation / movement / movement cylinder device 25.
[0016]
And between the front-end | tip part of the multi-division type | mold winding shaft 12 of the said winding means 10, and the taking-out means 20 which protruded the pair of parallel pick-up rods 22 and 22 which oppose this, the said multi-division type | mold winding is carried out. A press means 30 is provided for press-molding the wound body 16 taken out from the shaft 12 into a flat shape.
[0017]
Next, the operation of the manufacturing apparatus having the above configuration will be described with reference to FIGS.
[0018]
When the predetermined winding body 16 is formed on the multi-split winding shaft 12 by the winding means 10 described above, the separating / approaching / moving cylinder device 25 moves the support frame 26 for the advancing / retreating movement of the take-out means 20 forward. Then, a pair of parallel take-out rods 22 and 22 are caused to enter the gap 14 of the multi-part winding shaft 12 (see FIG. 2). Next, the multi-divided winding shaft 12 moves backward, and the pair of extraction rods 22, 22 open to the left and right as the advance / retreat support frame 26 moves forward.
[0019]
After that, the separating and moving cylinder device 25 of the take-out means 20 moves the pair of take-out rods 22 and 22 away from each other via the separating and approaching movement link mechanism 24, and moves them to the inner diameter portion of the wound body 16. The winding body 16 can be easily removed from the multi-split winding shaft 12 via the take-out rods 22 and 22 by stopping at the abutting position and then retracting the support frame 26 for advancing / retreating movement. it can.
[0020]
In this way, the wound body 16 removed from the multi-split winding shaft 12 operates the separating / approaching moving cylinder device 25 of the extracting means 20 as shown in FIG. The wound body 16 is pressed into a flat shape by the upper press plate 32 and the lower press plate 34 of the press means 30 while the pair of take-out rods 22 and 22 are moved away from each other via 24.
[0021]
In addition, the wound body 16 press-molded in a flat shape in this way is then separated from the take-out rods 22 and 22 of the take-out means 20, appropriately processed electrode leads, and stored in a stainless steel battery case, A lithium ion secondary battery can be manufactured by connecting an internal electrode and an external electrode, and enclosing and sealing an electrolyte solution.
[0022]
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the spirit of the present invention.
[0023]
【The invention's effect】
As is apparent from the above-described embodiments, the lithium ion secondary battery manufacturing apparatus according to the present invention has a predetermined length formed by winding an insulating resin tape around a rectangular wire forming an internal electrode of a lithium ion secondary battery. Lithium ions are formed by forming the electrode lead, laminating and winding the positive electrode sheet and the negative electrode sheet through the separator using the electrode lead, and housing and enclosing the wound body together with the electrolyte in the battery case In the secondary battery manufacturing apparatus, when forming the wound body, the winding body is provided with a multi-part winding shaft configured to be adjustable in outer diameter, and the wound body is formed while sequentially supplying the separator together with the positive electrode sheet and the negative electrode sheet. Provided with a pair of take-out rods that are opposed to the multi-division type winding shaft of the winding means and that move forward and backward in the gap between the winding shafts and that move away from each other in parallel in the horizontal direction. When a required winding body is formed on the multi-split type winding shaft by arranging a take-out means, the take-out rod is inserted into a gap between the multi-split type winding shaft and wound from the multi-split type winding shaft. A multi-division type winding shaft in which the winding body is formed into a cylindrical shape by arranging a pressing means for pressing the winding body into a flat shape while removing the body and separating the take-out rods from each other. Therefore, the formation of a predetermined wound body can be achieved easily and quickly with a simple device configuration, and the lithium ion secondary battery can be mass-produced simply and at low cost.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic explanatory view showing an embodiment of a manufacturing apparatus for a lithium ion secondary battery according to the present invention and showing a main configuration of a plane of the manufacturing apparatus.
FIG. 2 is a schematic explanatory view showing a state in which a wound body formed on a winding shaft of the winding means shown in FIG. 1 is taken out by the taking-out means.
3 is a schematic explanatory view showing a state in which a wound body is pressed into a flat shape by the pressing means shown in FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Winding means 11 Support apparatus 12 Multi-stage division type winding shafts 12a, 12b, 12c Divided winding shaft 12d Adjustment key 13 Rotation drive shaft 14 Gap 16 Winding body 20 Take-out means 22, 22 Take-out rod 24 Link mechanism 25 for separation approaching movement Cylinder device 26 for moving away from and moving away 26 Support frame 30 for moving forward and backward The pressing means 32 The upper press plate 34 The lower press plate

Claims (1)

An electrode lead having a predetermined length is formed by winding an insulating resin tape on a flat rectangular wire forming an internal electrode of a lithium ion secondary battery, and the positive electrode sheet and the negative electrode sheet are formed through a separator using the electrode lead. In a manufacturing apparatus for a lithium ion secondary battery, which is laminated and wound, and this wound body is housed and enclosed in a battery case together with an electrolyte,
When forming the wound body, the winding means is provided with a multi-division type winding shaft configured so that the outer diameter can be adjusted, and the winding body is formed while sequentially supplying the separator together with the positive electrode sheet and the negative electrode sheet. The multi-divided winding shaft is provided with a pair of take-out rods that move forward and backward in the gap between the winding shafts in opposition to the multi-divided winding shaft and move away from each other in parallel in the horizontal direction. When the required winding body is formed above, the take-out rod is inserted into the gap between the multi-divided winding shafts to take out the winding body from the multi-split winding shaft, and the take-out rods are separated from each other. An apparatus for manufacturing a lithium ion secondary battery, comprising press means for pressing the wound body into a flat shape.

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