KR20220012748A - Apparatus abd method of measuring position weld for secondary battery - Google Patents

Abstract

The present invention relates to a welding position measurement apparatus for a secondary battery, comprising: a displacement member on which an electrode assembly, in which an electrode tab and an electrode lead are welded, is disposed; a laser member which irradiates the electrode assembly with laser; a movement member which sets a reference line by positioning the laser of the laser member at an end of the electrode assembly facing the electrode tab, and sets a measurement line by moving the laser member and positioning the laser of the laser member at an end of a welding surface of the electrode tab and the electrode lead facing the reference line; and a measurement member which measures a moving distance of the laser of the laser member from the reference line to the measurement line. By using the welding position measurement apparatus, the distance between the end of the electrode assembly and the end of the welding surface is measured to accurately inspect a welding position and a welding condition.

Description

Welding position measuring device and measuring method for secondary battery {APPARATUS ABD METHOD OF MEASURING POSITION WELD FOR SECONDARY BATTERY}

The present invention relates to a welding position measuring apparatus and a measuring method for a secondary battery, and more particularly, to a welding position measuring apparatus and a measuring method for a secondary battery capable of accurately measuring a welding position.

In general, a secondary battery refers to a battery capable of charging and discharging unlike a primary battery that cannot be charged, and such secondary batteries are widely used in high-tech electronic devices such as phones, notebook computers, and camcorders.

The secondary battery is classified into a can-type secondary battery in which an electrode assembly is embedded in a metal can and a pouch-type secondary battery in which an electrode assembly is embedded in a pouch, and the pouch-type secondary battery is an electrode assembly having an electrode tab, the electrode tab It includes an electrode lead coupled to, and a pouch for accommodating the electrode assembly in a state in which the tip of the electrode lead is withdrawn to the outside.

Here, the electrode tab and the electrode lead are welded using an ultrasonic welding device. At this time, the welding position and the welding state are inspected by measuring the distance between the electrode assembly and the welding surfaces of the electrode tab and the electrode lead.

However, in the conventional secondary battery, the distance between the end of the electrode assembly and the end of the welding surface of the electrode tab and the electrode lead is measured using a ruler marked on the scale. Therefore, it was not possible to inspect the exact welding position and welding state.

Patent Publication No. 10-2020-0011228.

The present invention for solving the above problems can clearly set a reference line by using a laser and a digital gauge, and can accurately measure the distance between the end of the welding surface of the electrode tab and the electrode lead from the end of the electrode assembly, Accordingly, an object of the present invention is to provide a welding position measuring device and a measuring method for a secondary battery capable of accurately inspecting a welding position and a welding state.

A welding position measuring apparatus for a secondary battery of the present invention for achieving the above object includes a disposing member on which an electrode assembly to which an electrode tab and an electrode lead are welded is disposed; a laser member irradiating a laser toward the electrode assembly; A reference line is set by positioning the laser of the laser member at the end of the electrode assembly toward the electrode tab, and the laser member is moved to direct the laser of the laser member toward the reference line between the electrode tab and the electrode lead. a moving member for setting a measurement line as it is positioned at the end of the welding surface; and a measuring member for measuring a distance that the laser of the laser member moves from the reference line to the measuring line.

The laser member may inspect the horizontality between the laser and the end of the electrode assembly by slit beaming the electrode assembly in the full width direction.

The moving member may include guide rails provided on both sides of the width direction of the arrangement member, and guide pieces having both ends slidably installed on the guide rail to move the laser member from the reference line to the measurement line. .

The moving member may further include a control lever for moving the guide piece forward or backward along the guide rail.

A confirmation hole for confirming the laser of the laser member irradiated toward the electrode assembly may be formed in the guide piece.

A convex lens may be installed in the confirmation hole.

The measuring member includes a measuring body fixed to the disposing member, a connecting piece having one end movably coupled to the measuring body in a direction from the reference line to the measuring line and the other end being movably connected together with the moving member, and the connecting piece It may include a measuring device for measuring the distance the laser of the laser member moves from the reference line to the measurement line while moving along the.

The measuring device may be provided as a digital vernier caliper.

It may further include a fixing member for fixing the electrode lead of the electrode assembly disposed on the arrangement member.

The fixing member is a fixed body fixed to the arrangement member, an arrangement piece fixed to a lower side of one surface of the fixed body and disposed at the tip of the electrode lead, one surface of the fixed body and the other side of the fixed body are coupled to move in the vertical direction, It may include a pressing piece for pressing and fixing the tip of the electrode lead disposed on the arrangement piece when descending, and a moving lever for raising or lowering the pressing piece.

It may further include an adjustment member for adjusting the position of the fixing member by moving the fixing member in the full width direction of the electrode assembly disposed on the disposition member so that the tip of the electrode lead and the fixing member coincide.

On the other hand, the method for measuring the welding position for a secondary battery of the present invention comprises the steps of disposing an electrode assembly in which an electrode tab and an electrode lead are welded; an irradiation step of irradiating a laser toward the electrode assembly; a reference line setting step of setting a reference line by locating a laser facing the electrode assembly at an end of the electrode assembly facing the electrode tab; a measuring line setting step of setting a measuring line by moving the laser irradiated to the end of the electrode assembly to be irradiated to the end of the welding surface of the electrode tab and the electrode lead facing the reference line; and measuring a distance traveled by the laser from the reference line to the measurement line.

A fixing step of fixing the tip of the electrode lead of the electrode assembly may be further included between the disposing step and the reference line setting step.

In the measuring step, the distance may be measured using a digital vernier caliper.

The irradiating step may further include a step of pre-irradiating the laser irradiated toward the electrode assembly in the full width direction of the electrode assembly to inspect the horizontality between the laser and the end of the electrode assembly.

The welding position measuring device for a secondary battery of the present invention includes an arrangement member, a laser member, a moving member and a measuring member to accurately measure the distance from the reference line, which is the end of the electrode assembly, to the measurement line, which is the end of the welding surface of the electrode tab and the electrode lead. Therefore, the welding position and the welding state can be accurately inspected. In particular, it is possible to accurately measure the positions of the reference line and the measurement line, thereby minimizing a measurement error.

In addition, in the welding position measuring device for a secondary battery of the present invention, the laser member can inspect the horizontality between the laser and the end of the electrode assembly by pre-irradiating the laser in the full width direction of the electrode assembly, thereby minimizing the measurement error. can

In addition, in the welding position measuring device for a secondary battery of the present invention, the moving member includes a guide rail and a guide piece, so that the laser member can be moved in a straight line from the reference line to the measurement line, and as a result, the measurement error can be minimized. .

In addition, in the welding position measuring device for a secondary battery of the present invention, the movable member is provided with a convex lens capable of magnifying and identifying the laser on the guide piece, so that the reference line and the measurement line to which the laser is irradiated can be enlarged and confirmed, and as a result, the reference line and measurement line can be set more clearly.

In addition, by including a fixing member for fixing the tip of the electrode lead of the electrode assembly in the welding position measuring device for a secondary battery of the present invention, it is possible to increase the fixing force of the electrode assembly disposed on the arrangement member.

1 is a front perspective view showing a welding position measuring device for a secondary battery according to a first embodiment of the present invention.
2 is a rear perspective view showing a welding position measuring device for a secondary battery according to a first embodiment of the present invention.
3 is a side view showing a welding position measuring device for a secondary battery according to a first embodiment of the present invention.
4 is a rear view showing a welding position measuring device for a secondary battery according to a first embodiment of the present invention.
5 is a plan view showing a welding position measuring device for a secondary battery according to a first embodiment of the present invention.
6 is a perspective view illustrating a fixing member of a welding position measuring device for a secondary battery according to a first embodiment of the present invention;
7 is a perspective view showing a moving member of the welding position measuring device for a secondary battery according to the first embodiment of the present invention.
8 is a front view showing a moving member of the welding position measuring device for a secondary battery according to the first embodiment of the present invention.
9 is a flowchart illustrating a method for measuring a welding position for a secondary battery according to a first embodiment of the present invention.
10 is a perspective view illustrating an arrangement step in a method for measuring a welding position for a secondary battery according to a first embodiment of the present invention;
11 is a perspective view illustrating a fixing step in a method for measuring a welding position for a secondary battery according to a first embodiment of the present invention.
12 is a plan view illustrating a reference line setting step in the method for measuring a welding position for a secondary battery according to the first embodiment of the present invention.
13 is a plan view illustrating a step of setting a measurement line in a method for measuring a welding position for a secondary battery according to a first embodiment of the present invention.
14 is a view illustrating a measurement step in a method for measuring a welding position for a secondary battery according to a first embodiment of the present invention.
15 is a perspective view showing a welding position measuring device for a secondary battery according to a second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily carry out the present invention. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

[Welding position measuring device for secondary battery according to the first embodiment of the present invention]

The welding position measuring apparatus for a secondary battery according to the first embodiment of the present invention measures the distance from a reference line, which is an end of an electrode assembly corresponding to each other, to a measurement line, which is an end of a welding surface of an electrode tab and an electrode lead, using a laser and a digital gauge. Accordingly, the welding position can be clearly measured through the measurement distance, and thus the welding state can be accurately inspected, and in particular, it has a structure that can minimize the measurement error.

That is, the welding position measuring apparatus 100 for a secondary battery according to the first embodiment of the present invention is, as shown in FIGS. 1 to 8 , an arrangement member 110 , a laser member 120 , and a moving member 130 . , including a measuring member 140 and a fixing member 150 .

arrangement member

The arrangement member 110 has a flat square plate shape, and the electrode assembly 10 to which the electrode tab 11 and the electrode lead 12 are welded is disposed on the upper surface. At this time, the electrode assembly 10 is disposed so that the electrode tab 11 and the electrode lead 12 face the fixing member 150 .

On the other hand, the arrangement member 110 includes a support piece 111 for guiding the electrode assembly 10 to be uniformly disposed, and the support piece 111 is on the upper surface of the arrangement member 110 , the electrode assembly 10 . ) while supporting the side of the electrode assembly 10 while being provided long in the full-length direction.

laser element

The laser member 120 is for irradiating a laser, and irradiates the laser L toward the upper surface of the electrode assembly 10 disposed on the arrangement member 110 . At this time, the laser member 120 slit beams the laser L in the full width direction (left and right direction when viewed in FIG. 5) of the electrode assembly 10, and accordingly, the laser of the laser member 120 ( L) and the level between the end of the electrode assembly 10 can be inspected. On the other hand, when the laser L of the laser member 120 and the end of the electrode assembly 10 are not horizontal, the laser member 120 is rotated left or right to the level of the end of the laser and the electrode assembly 10 adjust to match.

moving member

The moving member 130 sets the reference line A by positioning the laser L of the laser member 120 at the end of the electrode assembly 10 facing the electrode tab 11 , and the laser member By moving (120), the laser (L) of the laser member (120) is positioned at the ends of the welding surface (13) of the electrode tab (11) and the electrode lead (12) facing the reference line (A) Set the measurement line (B).

Meanwhile, the electrode assembly 10 has a structure in which electrodes and separators are alternately stacked, and the separator has a larger area than the electrode. Accordingly, the moving member 130 sets the reference line A by positioning the laser L of the laser member 120 at the end of the separator included in the electrode assembly 10 . That is, the end of the electrode assembly 10 refers to the end of the separator included in the electrode assembly 10 .

For example, the moving member 130 includes guide rails 131 provided on both sides of the arrangement member 110 in the width direction, a laser member 120 is installed on the bottom surface, and both ends are on the guide rails 131 . and a guide piece 132 for moving the laser member 120 in a straight line from the reference line (A) to the measurement line (B) while being slidably installed. Accordingly, the moving member 130 can move the laser L of the laser member 120 in a straight line from the reference line A to the measurement line B, and as a result, the measurement error can be minimized.

Here, the laser member 120 is installed rotatably left or right on the bottom surface of the guide piece 132 , and accordingly, the laser L irradiated from the laser member 120 and the end of the electrode assembly 10 in the full width direction. You can adjust the horizontality between them.

Meanwhile, the moving member 130 further includes a control lever 133 for moving the guide piece 132 forward or backward along the guide rail 131 .

The control lever 133 includes a handle 133a rotatably coupled to the guide piece 132 and a rotary roller 133b that is rotated by the handle 133a and is in rolling contact with the guide rail 131 . include That is, when the control lever 133 rotates the handle 133a, the rotating roller 133b rotates along the guide rail 131 and moves along the guide rail 131 while moving the guide piece 132. can be moved

Meanwhile, the control lever 133 further includes a speed reducer between the handle 133a and the rotating roller 133b. That is, the reducer transmits the rotational force of the handle to the rotating roller 133b in a decelerated state, thereby reducing the moving speed of the guide piece 132, and as a result, the laser beam irradiated from the laser member 120 ( L) can be more precisely positioned on the reference line (A) or the measurement line (B).

For example, the speed reducer includes a driven gear 133c coupled to the rotating shaft of the handle 133a, coupled to the rotating shaft of the rotating roller 133b and meshed with the driven gear 133c, but with a larger diameter than the driven gear 133c. and a reduction gear (133d) for decelerating the rotational force of the driven gear (133c) as it has.

On the other hand, the guide piece 132 has a confirmation hole 132a for confirming the laser (L) of the laser member 120 irradiated toward the electrode assembly 10 is formed, the confirmation hole (132a) The laser (L) of the laser member 120 installed on the lower surface of the guide piece 132 and the reference line (A) or the measurement line (B) to which the laser (L) is irradiated can be more easily identified.

In particular, a convex lens 134 is installed in the confirmation hole 132a, and the convex lens 134 can enlarge a portion to which the laser L is irradiated. That is, the laser L can be accurately positioned on the reference line A or the measurement line B.

Measuring member

The measuring member 140 is for measuring the distance that the laser L moves from the reference line A to the measuring line B, and the measuring body 141 fixed to the arrangement member 110, and one end of the A connection piece 142 coupled to the measurement body 141 and movably coupled in a direction from the reference line A to the measurement line B and the other end is movably connected together with the movable member 130, and the connection piece and a measuring device 143 for measuring the distance the laser L of the laser member 120 moves from the reference line A to the measurement line B while moving along 142 .

That is, when the laser L of the laser member 120 is positioned on the reference line A, the measuring member 140 initializes the measuring device 143 and sets it to a 0 mm state. In this state, the laser member 120 is moved through the moving member 130 to move the laser L to the measurement line B. Then, the connecting piece 142 and the measuring device 143 move together. At this time, the moved distance is displayed on the measuring device 143 as a numerical value, and the measuring line ( The distance traveled to B) can be measured.

In addition, the measuring member 140 compares the measured distance value with the set distance value, and determines that welding is normal when located within the set range, and is determined as defective welding when positioned outside the set range. That is, the measuring member 140 can check whether welding has been accurately performed on the welding surface 13 of the electrode tab 11 and the electrode lead 12 through the measurement distance value.

On the other hand, the measuring device 143 is provided with a digital vernier caliper that is a digital gauge, and accordingly, the distance moved from the reference line (A) to the measurement line (B) can be displayed to the minor point place, and as a result, the distance measurement can increase the accuracy of

Therefore, the welding position measuring apparatus for a secondary battery according to the first embodiment of the present invention can accurately measure the distance from the reference line, which is the end of the pole assembly, to the measurement line, which is the end of the welding surface 13 of the electrode tab and the electrode lead, The condition can be checked accurately.

On the other hand, the welding position measuring apparatus for a secondary battery according to the first embodiment of the present invention further includes a fixing member 150 for fixing the electrode lead 12 of the electrode assembly 10 disposed on the arrangement member (110).

fixing member

The fixing member 150 is for fixing the electrode lead 12 of the electrode assembly disposed on the disposing member for accuracy of distance measurement, the fixing body 151 fixed to the disposing member 110, the fixing body ( The arrangement piece 152 fixed to the lower side of one surface of the electrode lead 12 and disposed at the front end of the electrode lead 12, the arrangement piece 152 is coupled to the other side of one surface of the fixed body 151 so as to be movable in the vertical direction when descending. ) includes a pressing piece 153 for pressing and fixing the tip of the electrode lead 12 disposed in the position, and a moving lever 154 for raising or lowering the pressing piece 153 .

In the fixing member 150 having such a configuration, the tip of the electrode lead 12 of the electrode assembly 10 disposed on the placement member 110 is disposed on the upper surface of the placement piece 152 fixed to the fixing body 151, and then , to rotate the moving lever 154 . Then, while the pressing piece 153 descends, the electrode lead 12 disposed on the placement piece 152 is pressed. That is, the electrode lead 12 may be fixed through the pressing force of the placing piece 152 and the pressing piece 153 .

Therefore, the welding position measuring apparatus for a secondary battery according to the first embodiment of the present invention may further include a fixing member 150 to fix the electrode lead immovably, and accordingly, the electrode tab and the electrode at the reference line, which is the end of the electrode assembly. The distance to the measurement line, which is the end of the welding surface of the lead, can be accurately measured.

Hereinafter, a method for measuring a welding position for a secondary battery according to a first embodiment of the present invention will be described.

[Method for measuring welding position for secondary battery according to the first embodiment of the present invention]

As shown in FIGS. 9 to 14, the welding position measuring method for a secondary battery according to the first embodiment of the present invention includes an arrangement step (S10), a fixing step (S15), an irradiation step (S20), and a reference line setting step ( S30), a measuring line setting step (S40), and a measuring step (S50).

deployment stage

The disposing step (S10) is for disposing the electrode assembly to which the electrode tab and the electrode lead are welded, referring to FIG. 9, and the electrode tab 11 and the electrode lead 12 are welded to the upper surface of the disposing member 110. The electrode assembly 10 is disposed.

fixed stage

The fixing step (S15) is for fixing the electrode lead, and the tip of the electrode lead 12 of the electrode assembly 10 disposed on the placement member 110 is fixed through the fixing member 150 . That is, the fixing member 150 arranges the tip of the electrode lead 12 of the electrode assembly 10 disposed on the placement member 110 on the upper surface of the placement piece 153 fixed to the fixing body 151, and then moves the The lever 154 is rotated. Then, the pressing piece 153 descends and presses the electrode lead 12 disposed on the placement piece 153 , and accordingly, the electrode lead 12 is press-fitted through the pressing force of the placement piece 152 and the pressing piece 153 . can be fixed.

Investigation stage

In the irradiation step (S20), the laser member 120 is operated to irradiate the laser (L) toward the electrode assembly 10 .

At this time, the irradiating step (S20) further includes a step of pre-irradiating the laser irradiated toward the electrode assembly in the full width direction of the electrode assembly to inspect the horizontality between the laser and the end of the electrode assembly. That is, the laser L is slit beam irradiated in the full width direction (left and right direction when viewed in FIG. 5) of the electrode assembly 10, and accordingly, the laser of the laser member 120 and the electrode assembly 10 ) Check the horizontality of the end. At this time, if the laser of the laser member 120 and the end of the electrode assembly 10 are not horizontal, the laser member 120 is rotated to adjust the horizontality between the laser and the end of the electrode assembly 10 .

Baseline setting stage

In the reference line setting step ( S30 ), the reference line is set by positioning the laser directed toward the electrode assembly at the end of the electrode assembly toward the electrode tab. That is, the reference line setting step (S30) moves the laser member through the moving member 130 so that the laser L of the laser member 120 is directed toward the electrode tab at the end of the electrode assembly 10, preferably to the electrode assembly. It is positioned at the end of the included separator, and the end of the electrode assembly 10 where the laser L is positioned is set as the reference line (A).

Here, it is set as the reference line (A) after accurately checking whether the laser L and the ends of the electrode assembly 10 match through the convex lens 134 of the moving member 130 .

When the reference line A is set, the measuring device 143 of the measuring member 140 is initialized and set to Omm.

Measurement line setting step

In the measuring line setting step (S40), the measuring line is set by moving the laser irradiated to the end of the electrode assembly to be irradiated to the end of the welding surface of the electrode tab and the electrode lead facing the reference line. That is, by moving the laser member 120 through the moving member 130, the laser (L) of the laser member 120 is located at the end of the welding surface of the electrode tab and the electrode lead, and the welding surface ( 13) Set the end to the measurement line (B).

Here, it is set as the measurement line (B) after accurately checking whether the laser (L) and the welding surface (13) end coincide with each other through the convex lens (134) of the moving member (130).

measurement stage

In the measuring step (S50), the distance traveled by the laser (L) from the reference line (A) to the measurement line (B) is measured, and whether welding is defective is checked through the measured distance value (α). That is, in the measuring step ( S50 ), the measuring device 134 of the measuring member 130 moves in conjunction with the moving member 120 , and the moved distance is displayed on the measuring device 134 as a numerical value. In other words, if the numerical value displayed on the measuring device 134 is the distance moved from the reference line (A) to the measuring line (B), it is normal if it is located within the set range by comparing the measured distance value (α) with the set distance value set by the measuring device If it is located outside, it is determined as defective welding.

Therefore, the welding position measurement method for a secondary battery according to the first embodiment of the present invention can clearly measure the reference line and the measurement line, and accordingly, the distance from the reference line to the measurement line can be accurately measured, and as a result, it is possible to clearly determine whether welding is defective. can be inspected

Hereinafter, in describing another embodiment of the present invention, the same reference numerals are used for components having the same functions as those of the above-described embodiment, and overlapping descriptions will be omitted.

[Welding position measuring device for secondary battery according to the second embodiment of the present invention]

As shown in FIG. 15 , the welding position measuring apparatus 100 for a secondary battery according to the second embodiment of the present invention adjusts the position of the fixing member 150 to the tip of the electrode lead 12 and the fixing member 150 . ) includes an adjustment member 160 to match the position. That is, the adjusting member 160 moves the fixing member 150 in the full width direction of the electrode assembly 10 to match the position of the front end of the electrode lead 12 with the fixing member 150 .

For example, the adjustment member 160 is formed in the arrangement member 110 in which the fixing member 150 is located, the long hole 161 formed in the full width direction of the electrode assembly 10, the fixing member 150 and It includes a bolt 162 that is nut-coupled after passing through the long hole 161 .

That is, the fixing member 150 can be moved within the long hole depending on whether the bolt 162 is tightened, and accordingly, the position of the fixing member 150 can be adjusted to match the tip of the electrode lead 12 . . On the other hand, if the position of the fixing member 150 is adjusted, the fixing member 150 can be fixed to the arrangement member 110 by tightening the bolt 162 and the nut.

Therefore, the welding position measuring apparatus 100 for a secondary battery according to the second embodiment of the present invention can match the position of the front end of the electrode lead 12 and the fixing member 150 by including the adjustment member, and as a result, the electrode lead The tip of (12) can be stably fixed to the fixing member (150).

The scope of the present invention is indicated by the following claims rather than the above detailed description, and various embodiments derived from the meaning and scope of the claims and their equivalent concepts are possible.

100: welding position measuring device.
110: arrangement member
111: support piece
120: laser member
130: movable member
131: guide rail
132: guide
133: control lever
133a: handle
133b: rotary roller
140: measuring member
150: fixing member

Claims (15)

an arrangement member on which an electrode assembly in which an electrode tab and an electrode lead are welded is disposed;
a laser member irradiating a laser toward the electrode assembly;
A reference line is set by positioning the laser of the laser member at the end of the electrode assembly toward the electrode tab, and the laser member is moved to direct the laser of the laser member toward the reference line between the electrode tab and the electrode lead. a moving member for setting a measurement line as it is positioned at the end of the welding surface; and
A welding position measuring device for a secondary battery comprising a measuring member for measuring a distance moved by the laser of the laser member from the reference line to the measuring line. The method according to claim 1,
The laser member is a welding position measuring device for a secondary battery for inspecting the horizontality between the laser and the end of the electrode assembly by irradiating a line (slit beam) in the full width direction of the electrode assembly. The method according to claim 1,
The moving member includes guide rails provided on both sides of the arrangement member in the width direction, and guide pieces having both ends slidably installed on the guide rail to move the laser member from the reference line to the measurement line. Weld position measuring device. 4. The method according to claim 3,
The moving member may further include a control lever for moving the guide piece forward or backward along the guide rail. 4. The method according to claim 3,
A welding position measuring device in which a confirmation hole for confirming the laser of the laser member irradiated toward the electrode assembly is formed in the guide piece. 6. The method of claim 5,
A welding position measuring device for a secondary battery in which a convex lens is installed in the confirmation hole. The method according to claim 1,
The measuring member includes a measuring body fixed to the arrangement member, a connecting piece having one end movably coupled to the measuring body in a direction from the reference line to the measuring line and the other end being movably connected together with the moving member, and the connecting piece A welding position measuring device for a secondary battery comprising a measuring device for measuring the distance the laser of the laser member moves from the reference line to the measurement line while moving along the. 8. The method of claim 7,
The measuring device is a welding position measuring device for a secondary battery provided with a digital vernier caliper. The method according to claim 1,
A welding position measuring device for a secondary battery further comprising a fixing member for fixing the electrode lead of the electrode assembly disposed on the arrangement member. 10. The method of claim 9,
The fixing member includes a fixed body fixed to the arrangement member, an arrangement piece fixed to a lower side of one surface of the fixed body and having the tip of the electrode lead disposed, one surface of the fixed body and the other side of the fixed body are coupled to move in the vertical direction, A welding position measuring device for a secondary battery comprising a pressing piece for pressing and fixing the tip of the electrode lead disposed on the arrangement piece when descending, and a moving lever for raising or lowering the pressure piece. 10. The method of claim 9,
Welding position measuring device for a secondary battery further comprising an adjustment member for moving the fixing member in the full width direction of the electrode assembly disposed on the arrangement member to adjust the position of the fixing member so that the tip of the electrode lead and the fixing member coincide. disposing an electrode assembly in which the electrode tab and the electrode lead are welded;
an irradiation step of irradiating a laser toward the electrode assembly;
a reference line setting step of setting a reference line by locating a laser directed toward the electrode assembly at an end of the electrode assembly toward the electrode tab;
a measuring line setting step of setting a measuring line by moving the laser irradiated to the end of the electrode assembly to be irradiated to the end of the welding surface of the electrode tab and the electrode lead facing the reference line; and
A welding position measuring method for a secondary battery comprising a measuring step of measuring a distance traveled by a laser from the reference line to the measuring line. 13. The method of claim 12,
Between the disposing step and the reference line setting step, the welding position measuring method for a secondary battery further comprising a fixing step of fixing the tip of the electrode lead of the electrode assembly. 13. The method of claim 12,
The measuring step is a welding position measurement method for a secondary battery of measuring a distance using a digital vernier caliper. 13. The method of claim 12,
The irradiating step further includes the step of pre-irradiating the laser irradiated toward the electrode assembly in the full width direction of the electrode assembly to inspect the horizontality between the laser and the end of the electrode assembly.

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