KR20190079389A - Electrode panel stacking method urilizing Z folding electrode cell and electrode panel stacking device - Google Patents

Abstract

The present invention is to provide an electrode plate stacking apparatus using an angle in a Z-folding method. The configuration of the present invention comprises: a battery roll supporting step of supporting a surface of a separator in contact with a mandrel (20) at a folding part (2A) of a battery roll (2) grafted in a predetermined width with the separator interposed between a positive electrode plate and a negative electrode plate; and a mandrel retraction step for retracting the mandrel (20) from the battery roll (2). The mandrel retraction step is configured to draw the mandrel (20) in an oblique angular direction which is angularly spaced apart from the surface of the separator.

Description

[0001] The present invention relates to an electrode plate stacking method and an electrode panel stacking apparatus using an angle in a Z folding method,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electrode plate lamination system for producing a jelly roll of a secondary battery, and more particularly to a plate electrode plate assembly for preventing jarring or twisting of the separator membrane by stacking the anode plate, will be. The present invention relates to a pole plate lamination method using an angle in the Z folding method.

In the case where the electrode roll in which the positive electrode plate, the separator and the negative electrode plate are wound together is housed in a can connected to the negative electrode, and the cap is provided in the upper portion of the can, the secondary battery is rechargeable, There are many. On the upper and lower surfaces of the electrode roll, an insulating plate is usually provided to prevent contact between the cap and the can.

Here, the positive electrode plate, the negative electrode plate, and the separator plate (hereinafter referred to as a separator for convenience) in the manufacturing process of the secondary battery are stacked in a zigzag form to form a jelly roll (hereinafter referred to as a battery roll for convenience) There is a method of inserting the battery into an outer mold of a pouch type to complete the battery.

 Meanwhile, when the cell roll is made by the Z folding method, the positive electrode plate, the negative electrode plate, and the separator may be formed by a Z folding method A mandrel is required to support the laminate.

A folded laminated base material in which a positive electrode plate, a separator, a negative electrode plate, and a separator are laminated is folded (z-folded) in a zigzag pattern on the basis of a mandrel to form a battery roll having a constant width. At this time, when the folded laminated base material is Z-folded on the basis of the mandrel, the surface of the separator contacts the mandrel with a certain force. When the folding laminated base material is Z-folded with the mandrel drill placed on the separator above the positive electrode plate, the surface of the separator on the positive electrode is pressed against the mandrel drill, while the mandrel is placed under the separator below the negative electrode plate, Z folding, the surface of the separator below the negative plate is pressed against the mandrel.

After the battery roll is formed by the Z folding, the secondary battery is manufactured by performing the subsequent process such as pulling the mandrel drill out of the battery roll, and then sealing and sealing the battery roll in the pouch.

However, it is a problem that the separator is adversely affected when the mandrel is pulled out from the Z-folded battery roll. The mandrel is linearly moved back and forth so that when the mandrel is moved backward from the Z-folded battery roll, the mandrel drastically scratches the surface of the separator and has an undesirable influence such as scratching. If such a bad influence such as scratches occurs during retraction of the mandrel, the secondary battery may be defective. Particularly, the one end of the mandrel is configured to have a relatively small cross-sectional area as compared with the other portion, and the mandrel is retracted so as to be pulled out of the battery roll in a state in which one end of the mandrel is pressed against the surface of the separator of the Z- The margin of the mandrel becomes the same as that of the blade, and there is more room for the separator to generate a scratch like a sheath, thereby increasing the probability of failure of the secondary battery.

Korean Registered Patent No. 20-0228354 (registered on Apr. 12, 2001) Korean Utility Model No. 20-1999-0031053 (published on July 26, 1999) Korean Registered Patent No. 10-0478100 (Registered on March 11, 2005)

The present invention has been developed in order to solve the above-mentioned problems, and an object of the present invention is to prevent the separator from being torn or twisted by the mandrel when the battery roll is made by laminating the negative electrode plate, the positive electrode plate and the separator by the Z folding method And to provide a pole plate lamination method using angles in a Z-folding method of a new configuration for making a Z-folding method.

As the length of the electrode plate became longer, the length of the mandrel drilled became longer, and the contact surface between the separator (separator) and the mandrel drilled also became larger, so that the separator tore or twisted when the mandrel drilled.

In order to solve such a problem, the present invention provides an angle at the time before and after the mandrel to minimize the contact between the mandrel and the separator.

When an angle is given before and after the mandrel drilling, it means that the mandrel is moved forward and backward along the diagonal line direction extending at a predetermined angle from the straight line instead of the straight line, so that the mandrel is moved forward and backward in the diagonal line direction, The main purpose of the present invention is to minimize the contact area between the separators.

According to an aspect of the present invention, there is provided a battery roll having a separator interposed between a positive electrode plate and a negative electrode plate to support a surface of the separator in contact with the mandrel, Supporting step; And a step for retracting the mandrel to withdraw the mandrel drill so as to be pulled out of the battery roll, wherein the step of withdrawing the mandrel is configured to draw the mandrel drill in a diagonal angle direction at a predetermined angle from the surface of the separator A pole plate stacking method using an angle in a Z folding method is provided.

The battery roll supporting step includes: forming a folded laminated base material in which a cathode plate, a separator, a cathode plate, and a separator are arranged in this order from top to bottom; Advancing the mandrel drill so as to be arranged at a position capable of supporting the surface of one of the separators in the folded laminated base material; And folding the folded laminated base material on the basis of the mandrel drill to form the battery roll with a predetermined width and allowing the surface of the separator to contact and support the mandrel drill.

According to the present invention, when making the battery roll of the Z folding method (zigzag folding method), the men drill, which is the folding reference, is moved forward and backward in the oblique direction with respect to the longitudinal direction of the battery roll, It is possible to prevent a detrimental effect on the separator of the battery roll when the mandrel is reversed and to prevent a bad influence such as scratches during retraction of the mandrel, Is effective in eradicating it in advance.

In the Z-fold lamination type battery roll (jelly roll) method, contact between the mandrel and the separator should be minimized before and after the mandrel drilling.

According to the present invention, the separator (separator) and the mandrel drill are separated from each other at the moment when the mandrel drill is retracted at an angle, thereby reliably preventing the separator from being torn by the mandrel drill when the mandrel is retracted, can do.

Effects of the present invention include improvement of safety of jelly roll, improvement of appearance quality of jelly roll, improvement of reliability of jelly roll, and the like. Jelly roll means Z folding cell roll.

1 is a plan view of an electrode plate stacking apparatus used in a pole plate stacking method using an angle in the Z folding method according to the present invention
Fig. 2 is a plan view showing a state in which the mandrel drill advances and enters the inside of the battery roll in the electrode plate laminating apparatus shown in Fig. 1. Fig.
Fig. 3 is a plan view showing a state in which the mandrel drill shown in Fig. 2 is reversed
Fig. 4 is a plan view schematically showing a state in which the mandrel drill shown in Fig. 2 is reversed in an oblique direction
5 is a perspective view schematically showing a battery roll laminated by a Z folding method;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. For example, if a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, It is to be understood that other components may be "connected "," coupled "

Referring to the drawings, the pole plate stacking method using angles in the Z folding method of the present invention includes a step of supporting a battery roll and a step of retracting a mandrel, Of the separator of the battery roll 2 is prevented from being affected by the separator of the battery roll 2. The electrode plate stacking method using angles in the Z folding method of the present invention uses an electrode plate stacking apparatus. The pole plate laminating apparatus has a frame 12, a guide rail 14 provided on the frame 12, and a mandrel drill 20 which is moved forward and backward along the guide rail 14. In the present invention, the term "Z folding" is used. Since the battery roll 2 is folded in the zigzag direction and stacked, it can be called Z folding. The battery roll 2 manufactured by the Z folding method is called a Z folding battery roll (2). Hereinafter, for convenience of explanation, it is to be noted in advance that the Z-folding rollers are uniformly wound and referred to as the battery rolls 2 in some cases.

The electrode plate laminating apparatus for forming the Z folding battery roll 2 is configured such that a plurality of the mandrilles 20 can be moved forward and backward along the frame 12. [

When viewed from above, the first row mandrel drill 20 and the second row mandrel drill 20 are provided with respect to the center line between the right and left sides of the frame 12. The first row mandrel drill 20 and the second row mandrel drill 20 form a set of a first position mandrel drill 20 and a second position mandrel drill 20. One of the mandrel drills 20 of the first row mandrel drill 20 is positioned in the first row first position mandrel drill 20 and the other side mandrel 20 of the first row mandrel drill 20 ) Is the first row second position mandrel drill 20 and one of the mandrel drills 20 of the second row mandrel drill 20 is the second row third position mandrel drill 20 and the second row mandrel drill 20 The second mandrel drill 20 may be referred to as a second row fourth position mandrel drill 20.

The frame 12 is provided with a supporting portion of the battery roll 2. A Z-folding cell roll 2 (a battery roll 2 in which a positive electrode plate, a negative electrode plate and a separator are stacked in a zigzag direction) is supported on the supporting portion of the battery roll 2.

The frame 12 is provided with a guide rail 14. The guide rails 14 are arranged in a direction inclined at a predetermined angle with respect to the longitudinal direction of the frame 12. [ The frame 12 is provided with a first row guide rail 14 and a second guide rail 14. The first row guide rails 14 form one set of a pair of guide rails 14 when viewed from the top of the plate stacking apparatus and the pair of second row guide rails 14 The guide rails 14 of the first embodiment form one set. The two guide rails 14 of the first row guide rail 14 and the second row guide rail 14 are arranged to be gradually narrowed in the direction in which they face each other.

The left column is the first column in the plan view of the electrode plate laminating apparatus as viewed from above, the first row of the first column is the first position, the second row of the first column is the second position, The first row of the second row is the third position, and the second row of the second row is the fourth position.

One of the guide rails 14 and the other of the guide rails 14 of the first row guide rail 14 is arranged so that the distance therebetween gradually decreases from the leading end toward the proximal end when viewed from above the plate lamination apparatus. One of the guide rails 14 of the first row guide rail 14 is the first row first position guide rail 14 and the other rail 14 of the first row guide rail 14 is positioned on the first row second position guide The rail 14 can be called.

Each of the first row first position guide rails 14 and the first row second position guide rails 14 of the first row guide rails 14 is inclined at a predetermined angle with respect to the longitudinal direction of the frame 12 As shown in Fig. The first column first position guide rail 14 and the first column second position guide rail 14 are arranged in the oblique direction which is formed at a predetermined angle in the longitudinal direction of the frame 12. The first column first position guide rail 14 and the first column second position guide rail 14 are arranged in the longitudinal direction of the Z folding battery roll 2 arranged on the supporting portion of the battery roll 2 of the frame 12, Are arranged in oblique directions inclined at a constant angle.

Further, as viewed from above of the electrode plate stacking apparatus, one of the guide rails 14 and the other of the guide rails 14 of the second row guide rail 14 is arranged so that the distance therebetween becomes gradually narrower from the leading end toward the proximal end. One of the guide rails 14 of the second row guide rail 14 is positioned on the second column third position guide rail 14 and the other guide rail 14 is positioned on the second row fourth position guide The rail 14 can be called.

The second column third position guide rails 14 and the second column fourth position guide rails 14 are arranged in a state in which they are spread in a direction inclined at a predetermined angle with respect to the longitudinal direction of the frame 12. [ The second row third position guide rail 14 and the second row fourth position guide rail 14 are arranged in the oblique direction which is formed at a predetermined angle in the longitudinal direction of the frame 12. The second row third position guide rail 14 and the second row fourth position guide rail 14 are disposed in the longitudinal direction of the Z folding battery roll 2 disposed on the supporting portion of the battery roll 2 of the frame 12, Are arranged in oblique directions inclined at a constant angle.

The first guide rail 14 and the second row 14 are provided on both sides of the battery roll 2 with respect to the battery roll 2 in a state in which the Z folding battery roll 2 is disposed on the support portion of the battery roll 2 of the frame 12, The pair of guide rails 14 of the guide rails 14 are arranged in oblique directions inclined by a predetermined angle with respect to both longitudinal directions of the battery roll 2. [ The first guide rail 14 and the second row guide rail 14 are arranged symmetrically with respect to the Z folding cell roll 2 as a reference.

The moving block is slidably coupled to the first column guide rail 14 and the second column guide rail 14. [ The first row guide rail 14 and the second row guide rail 14 are arranged obliquely with respect to the longitudinal direction of the frame 12 so that the moving block is constantly moved in the longitudinal direction of the frame 12 The angle of inclination is oblique. When the first row moving block advances toward the support portion of the battery roll 2, the first row first position moving block and the first row second position moving block advances while increasing distance from each other, and the first row moving block When retreating from the supporting portion of the battery roll 2, the first column first position moving block and the first column second position moving block are moved backward while gradually getting closer to each other. When the second row moving block advances in the direction of the supporting portion of the battery roll 2, the second row third position moving block and the second row fourth position moving block advances while increasing distance from each other, The second row third position moving block and the second row fourth position moving block are also moved backward while gradually getting closer to each other when the block is retracted from the supporting portion of the battery roll 2. [

As a result, each of the moving blocks of the first row moving block and the moving block of the second row moving block, which are two sets of one row, are arranged in the longitudinal direction of the battery cell arranged in the battery cell supporting portion of the frame 12 It advances or reverses in an inclined diagonal direction at a certain angle. In other words, the mobile block mounting the mandrel 20 for supporting the folding portion 2A of the Z-folding battery cell is moved forward or backward in a diagonal direction extending at a predetermined angle with respect to the lateral length direction of the battery cell.

The frame 12 is mounted with the mandrel drill 20 forward and backward. The men drill 20 advances or reverses in a diagonal direction inclined at a predetermined angle with respect to the longitudinal direction of both sides of the Z folding battery roll 2. [ So that the mandrel drill 20 is advanced or retracted by the above-described electrode plate laminating apparatus.

And the mandrel drill 20 is fixed to the moving block. The proximal end of the mandrel 20 is fixed to the movable block. The mandrel 20 is disposed in a direction parallel to the longitudinal direction of the frame 12.

Specifically, the mandrel 20 is fixed to the first row first position moving block, the first row second position moving block, the second row third position moving block, and the second row fourth position moving block, respectively. The proximal end of the mandrel 20 is fixed to the front ends of the first row first position moving block, the first row second position moving block, the second row third position moving block, and the second row fourth position moving block. The mandrel 20 includes a first row first position mandrel drill 20, a first row second position mandrel drill 20, a second row third position mandrel drill 20, a second row fourth position mandrel 20, And a drill (20). The first row first position mandrel drill 20, the first row second position mandrel drill 20, the second row third position mandrel drill 20 and the second row fourth position mandrel drill 20 form a frame (12).

At this time, although not shown, known moving driving means are connected such that the cylinder rod of the cylinder is connected to the moving blocks or the motor shaft of the motor is connected to the ball screw via a ball nut, The moving blocks may be configured to move forward or backward. Preferably, the first row first position moving block, the first row second position moving block, and the first row first position mandrel drill 20 and the first row second position mandrel drill 20 mounted thereon are advanced together The second row third position moving block and the second row fourth position moving block and the second row third position mandrel drill 20 and the second row fourth position mandrel drill 20 mounted thereon, Are moved forward or backward together.

Since the guide rail 14 is arranged obliquely at a predetermined angle in the oblique direction with respect to the longitudinal direction of the frame 12 so that the moving block moves in the diagonal direction, 12 in the oblique direction with respect to the side longitudinal direction. That is, the mandrel 20 is advanced in the diagonal oblique direction so as to widen the angle of the side surface of the battery roll 2 disposed on the supporting portion of the battery roll 2 of the frame 12 at a predetermined angle. More specifically, the first row guide rail 14 and the second row guide rail 14 are arranged obliquely with respect to the longitudinal direction of the frame 12, The first column first position moving block, the first column second position moving block, the first column first position mandrel drill 20 and the first column second position mandrel drill 20 mounted thereon, When the first row moving block is retracted by the supporting portion of the battery roll 2, the first row first position moving block and the first row second position moving block and the first row The first position mandrel drill 20 and the first row second position mandrel drill 20 are moved backward by gradually narrowing the distance from each other. When the second row moving block advances in the direction of the supporting portion of the battery roll 2, the second row third position moving block, the second row fourth position moving block, and the second row third position moving block mounted thereto When the second row moving block is retracted from the supporting portion of the battery roll 2, the second row third position moving block and the second row fourth row move forward, The position moving block and the second row third position mandrel drill 20 and the second row fourth position mandrel drill 20 mounted thereon are also moved backward as their distances are gradually narrowed.

As a result, the two first position mandrel drills 20, the first row second position mandrel drills 20 and the second row move blocks 20 of the first row mandrel drill 20, Each of the second row third position mandrel drill 20 and the second row fourth position mandrel drill 20 of each of the moving blocks is disposed in the battery cell supporting portion of the frame 12 with respect to the longitudinal direction of the battery cell It advances or reverses along a diagonal direction which is a certain angle.

The method of polar plate stacking using an angle in the Z folding method according to the present invention is characterized in that the surface of the separator in the folding portion 2A of the battery roll 2 in which the separator is interposed between the positive electrode plate and the negative electrode plate, 20, and a men drill retracting step for retracting the mandrel drill 20 so as to be pulled out of the battery roll 2. At this time, in the present invention, the step of withdrawing the mandrel is characterized in that the mandrel 20 is drawn out in a diagonal angle direction which is a predetermined angle from the surface of the separator. On the other hand, the cell roll supporting step includes a folding laminated base material forming step, a mandrel 20 advancing step, and a Z folding step.

In the folding laminated base material forming step, a folded laminated base material in which a cathode plate, a separator, a cathode plate, and a separator are arranged in this order from top to bottom is formed. Of course, a folded laminated base material in which an anode plate, a separator, a positive electrode plate, and a separator are arranged from top to bottom can also be formed.

In the step of advancing the mandrel drill 20, the mandrel drill 20 is advanced so as to be arranged at a position capable of supporting the surface of any one of the separators in the folded laminate base material. In the present invention, the first row mandrel drill 20 and the second row mandrel drill 20 are advanced to be arranged at positions capable of supporting the surface of the separator of the folded laminated base material. At this time, the first thermemann drill 20 and the second thermemill drill 20 advance along the diagonal line direction, not the straight line direction parallel to the longitudinal direction of both sides of the frame 12.

In the Z folding step, the folded laminated base material is folded on the basis of the mandrel 20 so that the battery roll 2 is formed to have a constant width and the surface of the separator is contacted and supported on the mandrel 20. In the present invention, the folded laminated base material is folded on the basis of the first thermemann drill 20 and the second thermemann drill 20 so that the battery roll 2 is formed to have a constant width and the first thermemann drill 20 So that the second row mandrel drill 20 is held in contact with the surface of the separator at a position adjacent to both ends of the Z folding cell roll 2. (Z-folding process) of folding the folded laminated base material in the zigzag direction in a state that the first column mandrel drill 20 and the second column mandrel drill 20 support the folded laminated base material in two places, The mandrel drill 20 and the second row mandrel drill 20 are held in contact with the surface of the separator at positions adjacent to both ends of the Z folding cell roll 2.

As described above, after the Z folding cell roll 2 is formed by folding the electrode plate folding laminate in the zigzag direction, the mandrel 20 is retracted to be pulled out from the battery roll 2. The feature of the present invention arises at the time of retraction of the mandrel 20. As described above, when the mandrel 20 is retracted in the state where the Z folding battery roll 2 is formed, the mandrel 20, which has been in contact with the separator in the folding portion 2A of the Z folding battery roll 2, It does not retreat along the line but retreats along the diagonal line direction which is gradually increasing at an angle from the straight line. In the present invention, since the first laminar drill 20 and the second laminar drill 20 are widened at a predetermined angle from a straight line extending in both lateral directions of the battery roll 2, .

In other words, the electrode plate folding laminate is folded (Z folded) in the zigzag direction on the basis of the mandrel 20 to form a battery roll 2 (also referred to as a jelly roll). In the state that the electrode plate folding laminate is supported by the first row mandrel drill 20 and the second row mandrel drill 20, Thereby forming the Z-forming battery roll 2 by folding the laminate in the zigzag direction.

On the other hand, after the electrode plate folding laminate is Z-folded, the first thermoend drill 20 and the second thermoend drill 20 are retracted from the battery roll 2 so as to fall out of the battery roll 2.

At this time, the mandrel 20 does not retreat linearly along the side lengthwise direction of the battery roll 2, but retreats along the oblique direction gradually widening at a constant angle from the side straight line of the battery roll 2, ) Of the separator is minimized so as to prevent the separator from being adversely influenced such as scratches on the separator by the mandrel 20 when the mandrel 20 is retracted . That is, when the mandrel 20 is retracted from the battery roll 2, the end of the mandrel 20 is moved in the oblique direction gradually widened while being separated from the surface of the separator of the battery roll 2, Since the end of the mandrel drill 20 is not formed on the surface of the separator 20 that is scratched like a blade so that the separator of the battery roll 2 is scratched when the mandrel 20 is retracted, There is an effect of preventing the roll 2 from being twisted or the like in advance. When the mandrel 20 is retracted in the linear direction from the battery roll 2, the end of the mandrel 20 becomes a blade and the surface of the separator is cut off. In the present invention, however, There is no case where the end of the mandrel 20 is cut off the surface of the separator like a blade so that the undesirable effect as described above when the mandrel 20 is retracted It is possible to prevent it from affecting. It is possible to prevent the separator from being damaged at the folding portion 2A of the battery roll when the mandrel drill 20 comes off from the battery roll.

In the conventional method in which the electrode plate and the negative electrode plate are linearly moved back and forth in the stacking of the separator and the separator, the mandrel 20 affects the separator at the time of backward movement. In the present invention, however, So that it does not affect the separator of the battery roll 2 when the mandrel 20 is moved backward.

At this time, the angular range in the oblique direction in which the mandrel 20 is retracted is 0.1 to 5 degrees. If the angle in the oblique direction is smaller than 0.1 DEG, there is a possibility that the separator surface of the battery roll 2 may be scratched even if the mandrel 20 is retreated in the oblique direction. Therefore, the oblique angle should be larger than 0.1 DEG, The angular movement range of the mandrel 20 becomes unnecessarily too large, and the size of the frame 12 of the plate lamination device may become too large. Therefore, it is preferable that the angle in the diagonal direction is smaller than 5 degrees.

Since the guide rail 14 is disposed in the oblique direction in the electrode plate laminating apparatus and the mandrel 20 is moved forward or backward along the guide rail 14 in the oblique direction, The movement guide structure of the mandrel drill 20 for preventing the separator of the battery roll 2 from being affected has a comparatively simple effect. On the other hand, when the mandrel 20 is connected to the cylinder rod of the cylinder arranged in the oblique direction, since the mandrel 20 advances or retreats in the oblique direction according to the operation of the cylinder, The movement guide structure can be implemented more simply.

Further, in the present invention, the electrode plate folding laminate can be wound in a state in which the first row mandrel drill 20 and the second row mandrel drill 20 support the surfaces adjacent to both ends of the electrode plate folding laminate, The roll 2 can be formed more stably and precisely. It can be said that it is more effective in preventing the defective factors such as the angle of the Z folding cell roll 2 being changed or the size being changed.

The mandrels 20 are mounted on the lifting frame 12 and the lifting frame 12 is connected to an unillustrated lifting and driving device so that each layer of the Z folding cell roll 2 is stacked in the zigzag direction The lifting and lowering device 20 can be lifted and lowered by an unillustrated lifting and lowering device to wind the electrode plate folding laminate on the basis of the mandrel 20.

The specific embodiments of the present invention have been described above. It is to be understood, however, that the scope and spirit of the present invention is not limited to these specific embodiments, and that various modifications and changes may be made without departing from the spirit of the present invention. If you have, you will understand.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

2. Battery Roll 2A. Folding portion
12, frame 14. Guide rail
20. Men Drill

Claims (3)

A battery roll supporting step of supporting a surface of the separator in contact with the mandrel drill 20 at a folding portion 2A of the battery roll 2 where a separator is interposed between the positive electrode plate and the negative electrode plate,
And retracting the mandrel drill (20) so as to be withdrawn from the battery roll (2)
Wherein the step of moving the mandrel is configured to draw the mandrel (20) in a diagonal angle direction which is a predetermined angle from the surface of the separator.
The method according to claim 1,
The battery roll supporting step includes:
Forming a folded laminated base material in which a positive electrode plate, a separator, a negative electrode plate, and a separator are arranged in this order from top to bottom;
Advancing the mandrel drill (20) so as to be arranged at a position capable of supporting the surface of any one of the separators in the folded laminated base material;
A folding step of folding the folded laminated base material on the basis of the mandrel drill 20 to form the battery roll 2 with a predetermined width and allowing the surface of the separator to contact and support the mandrel drill 20; The method of claim 1 or 2, wherein the Z-folding method comprises the steps of:
A frame 12;
And a mandrel (20) coupled to the frame (12) so as to be movable forward and backward,
Wherein the mandrel (20) is configured to be operated forward and backward in a direction inclined by a predetermined angle with respect to the longitudinal direction of the frame (12).

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