JP6409609B2 - Electrode manufacturing method - Google Patents

Description

  The present invention relates to an electrode manufacturing method.

  A method is known in which a plate-shaped material is punched out using a convex tool and a concave tool opposed to the cutting edge (see Patent Document 1). In the recess of the concave tool of the upper mold, a pad that slides with a slight clearance from the side surface of the cutting tool of the concave tool is installed. In this method, first, gas is blown out toward the plate-shaped material from between the side of the cutting edge of the concave tool of the upper mold and the pad, and foreign matter adhering to the plate-shaped material or the concave tool is removed. Next, the concave tool is lowered, and the plate-shaped material is cut with the cutting edge of the convex tool of the lower mold and the cutting edge of the concave tool. Thereafter, the concave tool is raised, and the product obtained by cutting the plate-like material is taken out of the mold.

JP2011-218499A

  In the above method, after cutting the plate-like material, foreign matter such as cutting powder is wound up with the rise of the concave tool of the upper mold, and the foreign matter may remain on the product.

  By the way, the electrode for the power storage device is formed by cutting the workpiece by the cooperation of the lower mold and the upper mold. For this reason, when an electrode as a product is manufactured by the above method, there is a possibility that foreign matters such as cutting powder wound up with the rise of the upper die may remain on the electrode after the workpiece is cut.

  An object of one aspect of the present invention is to provide an electrode manufacturing method that can prevent foreign matter from remaining on an electrode after the workpiece is cut.

  An electrode manufacturing method according to an aspect of the present invention is an electrode manufacturing method for a power storage device, and is arranged between the lower mold and the pressing member by cooperation of the lower mold and the upper mold. A cutting step of cutting the workpiece to form the electrode, and after the cutting step, the pressing member is separated from the electrode, and then directed from the blowout port formed on the pressing surface of the pressing member toward the electrode. And a blowing step for blowing out gas.

  According to this manufacturing method, after cutting the workpiece, it is possible to prevent foreign matters such as cutting powder (for example, metal powder or active material powder) wound up with the rise of the upper die or the pressing member from remaining on the electrode. .

  In the blowing step, the gas may be blown out toward the surface position of the electrode between the position of the cut surface of the electrode and the position of the blowing port as seen from the normal direction of the pressing surface.

  In this case, the foreign matter adhering to the surface of the electrode and the cut surface can be efficiently blown away.

  According to one aspect of the present invention, it is possible to provide an electrode manufacturing method capable of suppressing foreign matter from remaining on an electrode after the workpiece is cut.

It is a figure which shows typically the manufacturing apparatus of the electrode which concerns on embodiment. It is a figure which shows typically the manufacturing apparatus of the electrode which concerns on embodiment. It is a figure which shows typically the manufacturing apparatus of the electrode which concerns on embodiment. FIG. 4 is a top view of a part of the electrode manufacturing apparatus of FIG. 3.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and redundant descriptions are omitted.

  1 to 3 are diagrams schematically illustrating an electrode manufacturing apparatus according to an embodiment. FIG. 4 is a top view of a part of the electrode manufacturing apparatus of FIG. 1 to 4 show an XYZ orthogonal coordinate system. The electrode manufacturing apparatus 100 shown in FIGS. 1 to 4 is an apparatus for manufacturing an electrode E for a power storage device. Examples of the power storage device include a secondary battery such as a lithium ion secondary battery, and a capacitor such as an electric double layer capacitor.

  The electrode manufacturing apparatus 100 has a lower mold 4 on which a workpiece W is placed, an upper mold 6 disposed to face the lower mold 4, and disposed to face the lower mold 4 and next to the upper mold 6. The pressing member 8 is provided. The pressing member 8 is, for example, a stripper plate. A gap may be formed between the upper mold 6 and the pressing member 8. The workpiece W can be disposed between the lower mold 4 and the upper mold 6 and between the lower mold 4 and the pressing member 8. By the cooperation of the lower mold 4 and the upper mold 6, the workpiece W disposed between the lower mold 4 and the pressing member 8 is cut to form the electrode E. The upper mold 6 can punch the workpiece W by moving up and down relatively with respect to the lower mold 4. The lower mold 4 and the upper mold 6 are, for example, molds. The lower mold 4 has, for example, a recess 4a. A lower blade 4c is formed at the edge of the recess 4a. The lower blade 4c has, for example, a portion 4b corresponding to the shape of the tab of the electrode E (the portion where the active material layer is not formed) (see FIG. 4). The upper mold 6 has a convex portion 6a fitted into the concave portion 4a. An upper blade 6c is formed on the edge of the convex portion 6a so as to face the lower blade 4c. The pressing member 8 moves up and down relatively with respect to the lower mold 4 to press and fix the workpiece W when the workpiece W is cut.

  The workpiece W may be a plate member having a rectangular shape, for example. The workpiece W can include a metal foil and an active material layer provided on the metal foil. In this case, the metal foil and the active material layer are cut. The active material layer may be provided on both surfaces of the metal foil. Examples of the metal foil include copper foil and aluminum foil. Examples of the active material layer include a positive electrode active material layer and a negative electrode active material layer. In the negative electrode active material layer, active material powder is likely to be generated at the time of cutting as compared with the positive electrode active material layer.

  On the pressing surface 8 p of the pressing member 8, a blowing port 8 a for blowing the gas G toward the electrode E is formed. Inside the pressing member 8, a flow path 8b for supplying the gas G to the outlet 8a is formed. The gas G is blown out toward the surface position P of the electrode E between the position R of the cut surface Ec of the electrode E and the position Q of the blowing port 8a when viewed from the normal direction (Z direction) of the pressing surface 8p. The gas G blows out in a direction (X direction) approaching the cut surface Ec of the electrode E. The outlet 8a may extend along the extending direction (Y direction) of the cut surface Ec. Examples of the gas G include air and inert gas. Of the angles formed by the normal direction of the pressing surface 8p and the blowing direction of the gas G from the blowing port 8a, the smaller angle θ may be 0 ° or more and less than 90 °, or 30 ° or more and 60 ° or less. There may be.

  The electrode manufacturing method according to the embodiment may be performed as follows using, for example, the electrode manufacturing apparatus 100.

(Cutting process)
First, as shown in FIGS. 1 to 2, the work W disposed between the lower die 4 and the pressing member 8 is cut to form the electrode E by the cooperation of the lower die 4 and the upper die 6. To do. Specifically, first, the workpiece W is placed on the lower mold 4 (see FIG. 1A). Next, the pressing member 8 is lowered to fix the workpiece W between the lower mold 4 and the pressing member 8 (see FIG. 1B). At this time, the pressing surface 8p of the pressing member 8 contacts the workpiece W. Next, the upper mold 6 is lowered to cut the workpiece W (see FIG. 2A). Next, the upper mold 6 is raised (see FIG. 2B).

(Blowout process)
Next, the pressing member 8 is lifted to separate the pressing member 8 from the electrode E (see FIG. 3). After the separation, the gas G is blown out toward the electrode E from the blowing port 8a formed on the pressing surface 8p of the pressing member 8. It is preferable to continuously blow out the gas G from the timing when the pressing member 8 is separated from the electrode E to the timing when the pressing member 8 reaches the top dead center. The blowing of the gas G may be stopped at an arbitrary timing. The gas G may be blown out toward the surface position P of the electrode E between the position R of the cut surface Ec of the electrode E and the position Q of the blowing port 8a when viewed from the normal direction of the pressing surface 8p. In this case, the gas G is blown out from an oblique direction with respect to the surface of the electrode E. The gas G that has reached the surface of the electrode E flows along the surface of the electrode E and reaches the cut surface Ec of the electrode E.

  According to the electrode manufacturing method of the present embodiment, after cutting the workpiece W, for example, foreign matter such as cutting powder (for example, metal powder or active material powder) wound up as the upper die 6 or the pressing member 8 is raised is It can suppress remaining on E. When the gas G is blown out toward the surface position P of the electrode E, the foreign matter adhering to the surface of the electrode E and the cut surface Ec can be efficiently blown off. Moreover, the electrode E can be efficiently cleaned by adjusting the blowing direction of the gas G. The blowing direction of the gas G can be adjusted, for example, by controlling the direction of the nozzle having the blowing port 8a.

  As mentioned above, although preferred embodiment of this invention was described in detail, this invention is not limited to the said embodiment.

  4 ... Lower mold, 6 ... Upper mold, 8 ... Pressing member, 8a ... Blowout port, 8p ... Pressing surface, E ... Electrode, Ec ... Cut surface, G ... Gas, P ... Surface position of electrode, Q ... Blowout port Position, R ... cutting surface position, W ... work.

Claims (3)

A method of manufacturing an electrode for a power storage device, comprising:
A cutting step of cutting the workpiece disposed between the lower mold and the pressing member by cooperation of the lower mold and the upper mold to form the electrode,
After the cutting step, after the pressing member is separated from the electrode, a blowing step of blowing gas from the blowing port formed on the pressing surface of the pressing member toward the electrode;
Only including,
In the blowing step, the gas is blown out toward the surface position of the electrode between the position of the cut surface of the electrode and the position of the blowing port as seen from the normal direction of the pressing surface;
The method for producing an electrode, wherein the gas blowing direction is inclined with respect to the normal direction of the pressing surface . The method for manufacturing an electrode according to claim 1, wherein in the blowing step, the gas is continuously blown out while the pressing member is raised .   The method for manufacturing an electrode according to claim 1, wherein a gas blowing direction is adjustable.

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