KR102633687B1 - Notching mold for manufacturing electrode of secondary battery - Google Patents

Abstract

A notching mold for processing electrodes of secondary batteries that can easily adjust the gap between a punch and a die regardless of processing errors and assembly errors is disclosed.
The notching mold for processing electrodes of secondary batteries disclosed is,
A die member including a die holder and a die formed on the die holder; a punch member including a punch holder and a punch formed in a lower portion of the punch holder and operating in an upward and downward motion toward the die member; It includes a clearance adjustment unit that adjusts the gap between the punch and the die. Here, the clearance adjustment unit includes an adjustment space formed inside the die holder; a pressing plate formed inside the adjustment space; a compression spring formed between one inner wall of the adjustment space and the compression plate; It includes a spacer inserted between the pressing plate and the other inner wall of the adjustment space.

Description

Notching mold for manufacturing electrode of secondary battery}

The present invention relates to a notching mold for processing electrodes of secondary batteries that can easily adjust the gap between a punch and a die regardless of processing errors and assembly errors.

In general, secondary batteries are applied to various technical fields across industries due to repetitive charging and discharging.

For example, secondary batteries are not only widely used as an energy source for advanced electronic devices such as wireless mobile devices, but also electric vehicles are proposed as a way to solve air pollution from existing gasoline and diesel internal combustion engines that use fossil fuels. It is also used as an energy source.

These secondary batteries are manufactured by sequentially stacking a positive electrode plate, a separator, and a negative electrode plate and immersing them in an electrolyte solution, and electrode tabs for electrical connection are formed on the positive and negative electrode plates.

Figure 1 is a diagram schematically showing an electrode assembly constituting a secondary battery related to the present invention, and Figure 2 is a diagram schematically showing a conventional notching mold for a secondary battery, an example of a notching mold for processing a positive electrode tab and a negative electrode tab. is a schematic drawing.

Referring to FIG. 1, the electrode assembly 1 of a secondary battery consists of a positive electrode plate 2 coated with a positive electrode active material and a negative electrode plate 3 coated with a negative electrode active material stacked with a separator 4 in between.

In addition, a positive electrode tab 2a and a negative electrode tab 3a are formed to protrude from each of the positive electrode plate 2 and the negative electrode plate 3 for electrical connection.

Meanwhile, the above-mentioned positive electrode plate 2 and negative electrode plate 3 are usually sheared using a notching mold.

Referring to Figure 2, the notching mold consists of a die (5) and a punch (6), and the die (5) and the punch (6) are continuously supplied between the die (5) and the punch (6). ) is sheared to enable the tabs 2a and 3a to be continuously processed on the electrode film F.

That is, the punch 6 has a cross-sectional shape corresponding to the flat cross-sectional shape of the pocket 5a formed in the die 5, and the electrode film is formed as the punch 6 moves up and down the inside and outside of the pocket 5a of the die 5. As (F) is sheared, tabs 2a and 3a are continuously formed in the electrode film (F).

And the semi-finished electrode plates (2-1, 3-1) on which the tabs (2a, 3a) are formed are wound into a roll by a rewinder (not shown).

However, in the conventional notching mold, since the punch and die are individually processed and assembled, there is a problem in that it is difficult to secure the clearance between the punch and die due to processing and assembly errors. As a result, there is a problem of deterioration in processing quality and reliability of the notching mold.

Korean Patent Publication No. 10-2252980

The purpose of the present invention is to provide a notching mold for processing electrodes of secondary batteries that can easily adjust the gap between the punch and the die regardless of processing errors and assembly errors.

The notching mold for processing electrodes of secondary batteries according to an embodiment of the present invention,

A die member including a die holder and a die formed on the die holder; a punch member including a punch holder and a punch formed in a lower portion of the punch holder and operating in an upward and downward motion toward the die member; It includes a clearance adjustment unit that adjusts the gap between the punch and the die. Here, the clearance adjustment unit includes an adjustment space formed inside the die holder; a pressing plate formed inside the adjustment space; a compression spring formed between one inner wall of the adjustment space and the compression plate; It includes a spacer inserted between the pressing plate and the other inner wall of the adjustment space.

In the notching mold for processing electrodes of secondary batteries according to an embodiment of the present invention, an entrance through which the spacer can enter and exit may be formed at the top of the die holder.

In the notching mold for processing electrodes of secondary batteries according to an embodiment of the present invention, a spacer inclined surface may be formed at the bottom of the spacer.

In the notching mold for processing electrodes of secondary batteries according to an embodiment of the present invention, a pressing plate inclined surface formed in a shape corresponding to the spacer inclined surface may be formed at the upper end of the pressing plate.

In the notching mold for processing electrodes of secondary batteries according to an embodiment of the present invention, a die inclined surface formed in a shape corresponding to the spacer inclined surface may be formed at an end edge of the die.

In the notching mold for processing electrodes of secondary batteries according to an embodiment of the present invention, a plurality of spacers are provided, and the thickness of the spacers may all be constant or may be formed in various sizes.

Details of other implementations of various aspects of the present invention are included in the detailed description below.

According to an embodiment of the present invention, the gap between the punch and the die can be easily adjusted regardless of processing errors and assembly errors. Therefore, processing quality and reliability of the notching mold can be improved.

1 is a diagram schematically showing an electrode assembly constituting a secondary battery related to the present invention.
Figure 2 is a diagram schematically showing a conventional notching mold for secondary batteries, and is a diagram schematically showing an example of a notching mold for processing positive electrode tabs and negative electrode tabs.
Figure 3 is a cross-sectional view showing a notching mold for processing electrodes of secondary batteries according to an embodiment of the present invention.
Figures 4 and 5 are partial cross-sectional views for explaining the operation process of a notching mold for processing electrodes of secondary batteries according to an embodiment of the present invention.

Since the present invention can be modified in various ways and can have various embodiments, specific embodiments will be exemplified and explained in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all transformations, equivalents, and substitutes included in the spirit and technical scope of the present invention.

The terms used in the present invention are only used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In the present invention, terms such as 'include' or 'have' are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof. Hereinafter, a notching mold for processing electrodes of secondary batteries according to an embodiment of the present invention will be described with reference to the drawings.

Figure 3 is a cross-sectional view showing a notching mold for processing electrodes of secondary batteries according to an embodiment of the present invention, and Figures 4 and 5 illustrate the operation process of the notching mold for processing electrodes of secondary batteries according to an embodiment of the present invention. This is a partial cross-sectional view for:

Referring to Figures 3 to 5, the notching mold for processing electrodes of secondary batteries according to the present invention includes a die member 10, a punch member 30 that moves up and down toward the die member 10, and a gap between the punch and the die. It includes a clearance adjustment unit 40 that adjusts.

Here, the die member 10 and the punch member 30 have a very different configuration from the conventional notching mold, and an example of the die member 10 and the punch member 30 will be described below.

First, the die member 10 includes a die 20, a die plate 16 on which the die 20 is installed, and a die holder 12 on which the die plate 16 is installed. .

As shown, the die holder 12 is provided in a flat shape with a predetermined thickness, and the die holder 12 has a scrap outlet 14 through which the scrap S generated during shearing processing of the electrode film F is discharged. It is formed to penetrate vertically.

The die plate 16, like the die holder 12, is provided in the shape of a flat plate with a predetermined thickness, and is fixed to the upper surface of the die holder 12 using bolts or the like.

At this time, a die installation hole 18 in which the die 20 is installed is formed in the die plate 16 facing the scrap discharge port 14. And between the die 20 and the die installation hole 18, a pocket 22 is formed through which the punch 36 of the punch member 30 enters and exits during shearing processing of the electrode film F.

Meanwhile, the die 20 installed in the die installation hole 18 is formed with a die cut 24 provided in a shape that matches the shape of the electrode film F to be sheared, and this die 20 is formed by bolts, etc. It may be installed in the die installation hole 18 or press-fitted into the die installation hole 18.

Meanwhile, the scrap discharge port 14, die installation hole 18, die 20, and pocket 22 may be formed and installed on one or both sides of the die holder 12 and the die plate 16.

The punch member 30 includes a punch 36, a punch plate 34 on which the punch 36 is installed, and a punch holder 32 on which the punch plate 34 is installed.

Like the die holder 12, the punch holder 32 is provided in the shape of a flat plate with a predetermined thickness, and is installed spaced apart from the upper side of the die holder 12 so that its lower surface faces the upper surface of the die holder 12. .

The punch holder 32 dies through a guide post (P) installed on the die holder 12 and a guide bush (not shown) that is installed on the punch holder 32 and can be lifted up and down on the guide post (not shown). It is installed to be able to go up and down on the member 10 side.

Like the punch holder 32, the punch plate 34 is provided in the shape of a flat plate with a predetermined thickness, and is fixedly installed on the lower surface of the punch holder 32 via bolts or the like.

At this time, a punch 36 is installed on the lower surface of the punch plate 34 facing the die 20. The punch 36 is a punch blade provided in a shape that matches the shape of the electrode film F to be sheared. (37) is formed, and the upper surface is fixed to the lower surface of the punch plate (34) via punch fixing bolts (35).

The punch 36 is formed to have a cross-sectional shape that matches the shape of the pocket 22 so that it can enter and exit the pocket 22. The punch 36 descends during shearing processing on the electrode film F, shearing the electrode film F placed on the die 20, and simultaneously enters the inside of the pocket 22 and then rises outside the pocket 22. , At this time, the electrode film (F) is sheared into the desired shape by the action of the die 20 and the punch 36. The punch 36 may be installed on one or both sides of the punch plate 34.

In addition, the punch member 30 may further include a stripper 38 installed at the lower portion of the punch plate 34 so as not to interfere with the punch 36.

The clearance adjustment unit 40 adjusts the gap between the punch 36 and the die 20. This clearance adjustment unit 40 includes an adjustment space 41, a compression plate 42, a compression spring 43, and a spacer 44.

The adjustment space 41 is an empty space formed inside the upper side of the die holder 12, and an entrance 41a through which the spacer 44 can enter and exit is formed at a predetermined position above the die holder 12. The adjustment space 41 accommodates a compression plate 42 and a compression spring 43.

The compression plate 42 is a plate member disposed in a vertical direction inside the adjustment space 41, and presses and supports one surface of the spacer 44 inserted into the adjustment space 41. A pressing plate inclined surface 42a may be formed at the upper end of the pressing plate 42 and has a shape corresponding to the spacer inclined surface 44a formed at the lower end of the spacer 44.

A compression spring 43 is formed between one inner wall of the adjustment space 41 and the compression plate 42. One end of the compression spring 43 is fixed to one inner wall of the adjustment space 41, and the other end of the compression spring 43 is fixed to one surface of the compression plate 42. The compression plate 42 can move in the horizontal direction according to the compression/extension of the compression spring 43.

The spacer 44 is a plate member with a predetermined thickness, and is inserted between the other surface of the compression plate 42 and the other inner wall of the adjustment space 41 to push the compression plate 42 toward one inner wall of the adjustment space 41. give. A spacer inclined surface 44a formed in a shape corresponding to the pressing plate inclined surface 42a may be formed at the bottom of the spacer 44.

There are a plurality of spacers 44, and the thickness of the spacers 44 is all of a constant size, or a plurality of spacers 44 are provided in various sizes, and various combinations of spacers 44 are inserted according to the clearance size to increase the gap between the punch and the die. can be easily adjusted.

In addition, a die inclined surface 20a formed in a shape corresponding to the spacer inclined surface 44a may be formed at the end edge of the die 20 on the side of the entrance 41a where the spacer 44 is inserted.

Next, the operation process of the notching mold for processing electrodes of secondary batteries according to an embodiment of the present invention will be described with reference to FIGS. 4 and 5.

In Figure 4, a process of inserting an additional spacer 44 is shown with three spacers previously inserted into the adjustment space 41.

The operator inserts the spacer inclined surface 44a between the previously inserted spacer and the die inclined surface 20a. As the spacer 44 is inserted, the die 20 moves to one side (left in the drawing) by the width of the spacer 44.

Then, the operator continues to insert the spacer 44 between the previously inserted spacer and the pressing plate 42. When the spacer 44 is inserted, the compression plate 42 compresses the compression spring 43 and moves to one inner wall (left side in the drawing) of the adjustment space 41 by the width of the spacer 44.

The operator repeatedly inserts the spacer 44 until adjustment of the gap between the punch and the die is completed. Once the gap adjustment is completed using the spacer 44, the spacer 45 can be firmly fixed with the fixing bolt 45 installed on the upper surface of the die holder 12.

Above, an embodiment of the present invention has been described, but those skilled in the art can add, change, delete or add components without departing from the spirit of the present invention as set forth in the patent claims. The present invention may be modified and changed in various ways, and this will also be included within the scope of rights of the present invention.

10: die member
20: die
30: Punch member
40: clearance adjustment unit 41: adjustment space
42: Pressing plate
43: compression spring
44: spacer

Claims (6)

A die member including a die holder and a die formed on the die holder;
a punch member including a punch holder and a punch formed in a lower portion of the punch holder, and moving up and down toward the die member;
It includes a clearance adjustment unit that adjusts the gap between the punch and the die, wherein the clearance adjustment unit includes,
an adjustment space formed inside the die holder;
a pressing plate formed inside the adjustment space;
a compression spring formed between one inner wall of the adjustment space and the compression plate;
a spacer inserted between the pressing plate and the other inner wall of the adjustment space;
A notching mold for processing electrodes of secondary batteries, including.
In claim 1,
A notching mold for processing electrodes of a secondary battery, wherein an entrance through which the spacer can enter and exit is formed at the top of the die holder.
In claim 1,
A notching mold for processing electrodes of secondary batteries, wherein a spacer inclined surface is formed at the bottom of the spacer.
In claim 3,
A notching mold for processing electrodes of secondary batteries, wherein a pressing plate inclined surface formed in a shape corresponding to the spacer inclined surface is formed at the top of the pressing plate.
In claim 3,
A notching mold for processing electrodes of secondary batteries, wherein a die inclined surface formed in a shape corresponding to the spacer inclined surface is formed at an end edge of the die.
The method according to any one of claims 1 to 5,
A notching mold for processing electrodes of secondary batteries, wherein a plurality of spacers are provided, and the thickness of the spacers is all constant or formed in various sizes.

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