KR20190053632A - Lead Bending Machine for Secondary Battery Cell - Google Patents

Abstract

The present invention relates to an electrode lead forming apparatus for a secondary battery cell, in which an electrode lead of an electrode assembly is formed by being bent in a Z shape in two stages in a process of manufacturing the second battery cell. According to the present invention, the electrode lead forming apparatus for a secondary battery cell is an apparatus for bending, in a Z shape, a positive electrode lead (4a) and a negative electrode anode lead (4b) in a Z shape, which are electrode leads (4) electrically connecting a cap assembly (3) and an electrode assembly (2) of a secondary battery cell (1). The apparatus comprises: a base frame (10) having a mounting portion (11) on which a secondary battery cell (1) to be formed is mounted; two horizontal moving frames (20) provided so as to horizontally reciprocate in both right and left sides of the mounting portion (11); a horizontal driving unit horizontally moving the two horizontal moving frames (20); lifting frames (30) provided to vertically move on each of the horizontal moving frames (20); a lifting driving unit vertically moving the lifting frames (30); two clampers (40) pressing and fixing the left and right side surfaces of the electrode assembly (2); a clamper driving unit horizontally moving the clampers (40); a first shaping knife (61) and a second shaping knife (62) provided in the lifting frame (30) and pressing upper and lower portions of the positive electrode lead (4a) and the negative electrode lead (4b) in opposite directions so as to be bent in a Z shape; a cap support unit provided between the two horizontal moving frames (20) to support the cap assembly (3) of the secondary battery cell; and a press drive unit vertically moving the cap support unit. According to the present invention, it is possible to reduce the total size of a forming apparatus and simplify a structure thereof.

Description

Technical Field [0001] The present invention relates to an electrode lead forming apparatus for a secondary battery cell,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for manufacturing a secondary battery, and more particularly, to an electrode lead forming apparatus for a secondary battery cell in which electrode leads of an electrode assembly are formed by bending Z-

A secondary cell refers to a battery capable of charging and discharging unlike a primary battery which can not be charged, and is widely used in high-tech electronic devices such as a cellular phone, a notebook computer, and a camcorder. Particularly, the lithium secondary battery has a working voltage of 3.6 V, which is three times higher than that of a nickel-cadmium battery or a nickel-hydrogen battery, which is widely used as a power source for electronic equipment, and is rapidly growing in terms of high energy density per unit weight .

Such a lithium secondary battery mainly uses a lithium-based oxide as a positive electrode active material and a carbonaceous material as a negative electrode active material. In general, a battery using a liquid electrolyte is referred to as a lithium ion battery, and a battery using a polymer electrolyte is referred to as a lithium polymer battery, depending on the type of electrolyte, and is classified as a liquid electrolyte battery and a polymer electrolyte battery. In addition, the lithium secondary battery is manufactured in various shapes. Typical shapes include a cylindrical shape, a square shape, and a pouch shape.

1A and 1B, a prismatic lithium secondary battery cell 1 includes an electrode assembly 2 accommodated in a can (not shown) made of a rectangular parallelepiped case made of a metal material, And a cap assembly 3 electrically connected to the top opening of the can.

In the electrode assembly 2, a positive electrode plate, a separator, and a negative electrode plate are wound in a jelly-roll type. The positive electrode lead 4a and the negative electrode lead 4b are drawn out from the positive electrode plate and the negative electrode plate, respectively. The positive electrode lead 4a and the negative electrode lead 4b are respectively connected to the terminals of the cap assembly 3 to electrically connect the electrode assembly 2 to the cap assembly 3. [

The lithium secondary battery cell 1 having such a structure is obtained by positioning the cap assembly 3 above the electrode assembly 2 before inserting the jelly-roll type electrode assembly 2 into the can, And the cathode lead 4b and the cathode lead 4b are welded and connected to the terminals and the upper and lower portions of the cathode lead 4a and the cathode lead 4b are respectively pushed in opposite directions to form a Z shape, And welding the cap assembly 3 and the upper end of the can, and injecting the electrolyte solution into the can through the electrolyte injection hole formed in the cap assembly 3 and sealing the same.

A plurality of forming knives 5a and 5b are formed on the upper portion of the positive electrode lead 4a and the upper portion of the negative electrode lead 4b as shown in Figure 2 in the process of bending the positive electrode lead 4a and the negative electrode lead 4b in the Z- And the upper and lower portions of the cathode lead 4a and the cathode lead 4b are bent in a Z shape while being shifted obliquely from opposite sides in the opposite directions.

However, in the related art, since the cam is used as the driving means for simultaneously moving the plurality of forming knives 5a and 5b, it is difficult to adjust the angle of the cam, The speed is difficult to adjust, the cam link structure is complicated, and the volume is large, so that there is a problem that the space is constrained.

Registration No. 10-1659120 (Registered on September 13, 2016) Registration No. 10-1050345 (registered on July 12, 2011)

It is an object of the present invention to provide an electrode assembly for an electrode assembly of a secondary battery, which can accurately and quickly bend and form a Z-shaped electrode terminal, and can easily control a setting time and a moving speed The present invention provides an electrode lead forming apparatus for a secondary battery cell that is structurally simple.

An electrode lead forming apparatus for a secondary battery cell according to the present invention is an apparatus for bending a positive electrode lead and a negative electrode lead that electrically connect an electrode assembly of a secondary battery cell and a cap assembly to Z shape, A base frame having a mounting portion; Two horizontally moving frames installed horizontally reciprocally in opposite directions on the right and left sides of the placement portion; A horizontal drive unit including a first servo motor for generating power for horizontally moving the two horizontal movement frames and a first power transmission unit for transmitting the power of the first servo motor to the horizontal movement frame; An elevating frame installed vertically movably in each of the two horizontal moving frames; And a second power transmitting portion provided in the horizontal moving frame for transmitting the power of the second servomotor to the lifting frame, wherein the lifting and lowering driving unit includes: ; And a second movable frame which is installed in each of the elevating frames and horizontally reciprocates in opposite directions horizontally by the movement of the horizontally moving frame by the horizontal driving unit while bending the upper and lower portions of the cathode lead and the cathode lead in opposite directions, A shaping knife and a second shaping knife; Two clampers horizontally movably disposed on opposite sides of the base frame in a direction opposite to the base frame at both sides of the base frame, and pressing and fixing the left and right side surfaces of the electrode assembly; A clamper driving unit for horizontally moving the clamper horizontally; A cap supporting unit installed between the two horizontal movement frames to support a cap assembly of the secondary battery cell; And a press drive unit including a third servo motor for generating power for vertically moving the cap supporting unit and a third power transmitting unit for transmitting the power of the third servo motor to the cap supporting unit have.

According to the present invention, the two forming knives are horizontally reciprocated by the linear motion device using the servo motor, and at the same time, the electrode leads (the positive electrode lead and the negative electrode lead) of the secondary battery cell can be bent and formed into Z- Therefore, it becomes easy to control the position setting time and the moving speed of the molding knife.

In addition, since the cam structure is not used to drive the molding knife, the overall size of the molding apparatus can be reduced and the structure can be simplified.

1A is a front view of a secondary battery cell.
1B is a side view of the secondary battery cell.
2 is a view showing a mechanism for forming an electrode lead of a secondary battery cell in the related art.
3 is a front view showing an electrode lead forming apparatus of a secondary battery cell according to an embodiment of the present invention.
Fig. 4 is a perspective view showing a main part of the electrode lead forming apparatus shown in Fig. 3. Fig.
5 to 7 are front views sequentially showing operation examples of the electrode lead forming apparatus shown in Fig.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not restrictive of the invention, as claimed, and it is to be understood that the invention is not limited to the disclosed embodiments.

Hereinafter, an electrode lead forming apparatus for a secondary battery cell will be specifically described with reference to the accompanying drawings. Like numbers refer to like elements throughout the drawings.

3 to 5, an electrode lead forming apparatus for a secondary battery cell according to an exemplary embodiment of the present invention includes an electrode assembly 2 and a cap assembly 3, which electrically connect the electrode assembly 2 and the cap assembly 3 of the secondary battery cell 1 A device for bending a positive electrode lead 4a and a negative electrode lead 4b which are an electrode lead 4 in a Z shape and includes a base frame 10 having a mounting portion 11 on which a secondary battery cell 1 to be molded is mounted Two horizontally moving frames 20 horizontally reciprocatingly movable from left and right sides of the placement unit 11, a horizontal drive unit horizontally moving the two horizontally moving frames 20, A lifting and lowering driving unit for vertically moving the lifting frame 30; two clamper 40 for pressing and fixing the left and right side surfaces of the electrode assembly 2; A clamper driving unit for horizontally moving the clamper 40 left and right, A first shaping knife 61 and a second shaping knife 62 for pressing the upper and lower portions of the cathode lead 4a and the anode lead 4b in opposite directions to bend into a Z shape, A cap supporting unit installed between the cap supporting unit 20 and the cap supporting unit 3 for supporting the cap assembly 3 of the secondary battery cell, and a press driving unit for moving the cap supporting unit up and down.

The base frame 10 is fixed to the molding apparatus and supports a horizontal drive unit, a clamper drive unit, a press drive unit, and the like.

The horizontal moving frames 20 are installed horizontally reciprocally in opposite directions to each other horizontally by the horizontal drive unit on both left and right sides of the placement unit 11 of the base frame 10. [ The horizontal driving unit for horizontally moving the horizontal moving frame 20 includes two first servo motors 21 provided on the right and left sides of the base frame 10 and two first and second servomotors 21, And a first power transmission part for transmitting the power of the first power transmission part to the horizontal movement frame. In this embodiment, the first power transmission unit includes a first ball screw 22 installed to extend in left and right directions on each of right and left sides of the base frame 10 and rotated by receiving power from the first servo motor 21, And a first nut portion (23) helically joined to the outer surface of the screw (22) and linearly moving in the axial direction of the first ball screw (22) by rotation of the first ball screw (22) (23) is engaged with the horizontal moving frame (20). Accordingly, when the first ball screw 22 is rotated by receiving power from the first servo motor 21, the first nut portion 23 moves along the axial direction (left-right direction) of the first ball screw 22 And the horizontal moving frame 20 coupled with the first nut portion 23 moves in the left and right direction together with the first nut portion 23.

At the tip of the horizontal moving frame 20, an elevating frame 30 is installed so as to be movable up and down along the elevating guide rail 34. The elevation driving unit for moving the elevating frame 30 upwards with respect to the horizontal moving frame 20 is provided above the front end of the horizontal moving frame 20 to generate power for moving the elevating frame 30 up and down Two second servomotors 31 and a second power transmitting portion for transmitting the power of each of the second servomotors 31 to the lifting frame 30. In this embodiment, the second power transmission unit includes a second ball screw 32 extending vertically at the front end of the horizontal moving frame 20 and rotated by receiving power from the second servo motor 31, And a second nut portion (33) helically joined to the outer surface of the screw (32) and linearly moving in the axial direction of the second ball screw (32) by rotation of the second ball screw (32) The outer surface of the part (33) is engaged with the lifting frame (30). Accordingly, when the second ball screw 32 receives power from the second servomotor 31 and rotates, the second nut 33 moves along the axial direction (vertical direction) of the second ball screw 32, And the lifting frame 30 coupled with the second nut portion 33 moves up and down together with the second nut portion 33.

A first shaping knife 61 and a second shaping knife 62 are provided at the lower end of each lifting frame 30 to simultaneously press the upper and lower portions of the cathode lead 4a and the anode lead 4b. The first shaping knife 61 and the second shaping knife 62 are formed of a flat plate as viewed from above and press the positive electrode lead 4a and the negative electrode lead 4b in opposite directions simultaneously to form a Z- do. The tip ends of the first and second shaping knives 61 and 62 are curved so as not to damage the cathode lead 4a and the cathode lead 4b when the cathode lead 4a and the cathode lead 4b are pressed. . The first shaping knife 61 is disposed a certain distance higher than the second shaping knife 62 to press the upper portion of the cathode lead 4a and the anode lead 4b and the second shaping knife 62 is located on the opposite side And presses the lower portions of the cathode lead 4a and the cathode lead 4b.

Two clamper (40) for stably supporting the electrode assembly (2) of the secondary battery cell is formed on both sides of the placement unit (11) where the bending and molding operation of the secondary battery cell (1) proceeds. The clamper 40 is installed on both sides of the placement unit 11 so as to horizontally move in opposite directions to each other with respect to the base frame 10 by the clamper driving unit so that the left and right sides of the electrode assembly 2 are fixed do.

The clamper driving unit may be constituted by the first pneumatic cylinder 41, but various known linear moving devices such as a ball screw and a linear motion device using a servo motor may be applied in addition to the pneumatic cylinder.

When the cap holder 53 of the cap supporting unit supports the both ends of the cap assembly 3 in the bending molding operation of the lead, Two electrode supports 70 can be installed on both sides of the base frame 10 to horizontally move in opposite directions to each other with respect to the base frame 10. The electrode support 70 presses and fixes the cathode lead 4a of the electrode assembly 2 and the lower end of the anode lead 4b so that the first and second molding knives 61, The positive electrode lead 4a and the negative electrode lead 4b can be stably supported without falling from the electrode assembly 2 when the battery 4a and the negative electrode lead 4b are pressed and bent.

The support base drive unit for horizontally moving the electrode support 70 may be constituted by a second pneumatic cylinder 71 mounted on the base frame 10. [

The cap supporting unit and the press driving unit are configured such that the first and second forming knives 61 and 62 bend the cap assembly 3 of the secondary battery cell while bending the cathode lead 4a and the cathode lead 4b And pushing the cap assembly 3 downward, so that a smooth lead bending operation can proceed.

The cap supporting unit includes a lift block 51 connected to a lower end of the press driving unit and moving up and down, and a pair of right and left side portions of the cap assembly 3, A cap holder actuator 52 installed at a lower portion of the elevation block 51 to horizontally move the cap holder 53 horizontally in opposite directions to each other and a cap holder actuator 52 And a press block 54 disposed below the cap assembly 3 and pressing the cap assembly 3 downward.

The cap holder actuator 52 can be constructed by applying a pneumatic cylinder in which two pistons extend and contract simultaneously in both the left and right directions. Each of the cap holders 53 is fixed to the distal end of the piston.

The press driving unit includes a third servo motor 55 fixed to the base frame 10 at an upper side of the placement unit 11 and a third servo motor 55 extending upwardly and downwardly from the placement unit 11, A third ball screw 56 which is rotated by receiving power from the servo motor 55 and a third ball screw 56 which is spirally coupled to the outer surface of the third ball screw 56 and is rotated by the rotation of the third ball screw 56, And the third nut part 57 is coupled to the elevating block 51 via the connecting frame 51a. Accordingly, when the third ball screw 56 receives power from the third servo motor 55 and rotates, the third nut 57 moves along the axial direction (up and down direction) of the third ball screw 56 And the lift block 51 coupled with the third nut portion 57 is moved up and down together with the third nut portion 57.

The electrode lead forming apparatus of the present invention thus configured operates as follows.

When the secondary battery cell 1 to be molded is transferred to the placement portion 11 of the base frame 10 by a transfer device (not shown) (see Fig. 1) The pneumatic pressure is applied to the first pneumatic cylinder 41 of the electrode assembly 2 so that the two clamper 40 move toward the secondary battery cell 1 at the same time to support the left and right sides of the electrode assembly 2.

At the same time, the press driving unit is operated so that the cap holder 53 and the press block 54, which are coupled to the elevating block 51, are lowered together by a certain distance so that the press block 54 contacts the upper surface of the cap assembly 3 At the same time, the cap holder actuator 52 operates to move the cap holder 53 toward the secondary battery cell 1 so as to grip and fix both sides of the cap assembly 3.

The electrode pads 70 move toward the secondary battery cell 1 by the second pneumatic cylinder 71 so as to press and support the lower ends of the cathode lead 4a and the cathode lead 4b.

When the electrode assembly 2 and the cap assembly 3 of the secondary battery cell 1 and the lower ends of the positive electrode lead 4a and the negative electrode lead 4b are supported as described above, the bending of the positive electrode lead 4a and the negative electrode lead 4b The preparation for the molding operation is completed.

Subsequently, the first servomotor 21 of the horizontal drive unit is operated to horizontally move the two horizontal movement frames 20 toward the secondary battery cell 1 as shown in FIG. 3, The upper end portion of the positive electrode lead 4a and the lower end portion of the negative electrode lead 4b are pressed against each other at the same time so that the tip ends of the two forming knives 62 press the upper and lower portions of the positive electrode lead 4a and the negative electrode lead 4b, Is bent into Z-shape. At this time, the third servomotor 55 of the press driving unit is operated to lower the elevating block 51 by a certain distance, and the cap holder 53 coupled to the elevating block 51 descends together with the cap assembly 3 ) Is lowered by a certain distance. The tip end portions of the first shaping knife 61 and the second shaping knife 62 press the upper and lower portions of the cathode lead 4a and the cathode lead 4b while pressing the cathode lead 4a and the cathode lead 4b, So that the upper and lower portions of the upper and lower portions can be naturally bent.

The tip end portions of the first and second shaping knives 61 and 62 press the upper and lower portions of the cathode lead 4a and the cathode lead 4b while pressing the first and second molding knives 61 and 62, The lift frame 30 on which the anode lead 4a and the cathode lead 4b are provided is lowered by a certain distance downward by the operation of the elevation drive unit so that the bending process of the cathode lead 4a and the anode lead 4b can proceed smoothly.

When the positive electrode lead 4a and the negative electrode lead 4b are bent into a Z shape by the first and second forming knives 61 and 62 and then the first servo motor 21 of the horizontal driving unit is moved The first molding knife 61 and the second molding knife 62 move in directions away from each other, that is, in a direction away from the secondary battery cell 1.

The third servomotor 55 of the press driving unit is operated to further lower the elevation block 51 by a predetermined distance so as to further lower the cathode lead 4a and the cathode lead 4b to thereby move the cathode lead 4a Thereby completing the Z-shaped molding of the negative electrode lead 4b.

The electrode support 70 is horizontally moved to the outside of the secondary battery cell 1 by the operation of the second pneumatic cylinder 71 and the cap holder 53 is opened by the operation of the cap holder actuator 52, The lift block 51, the cap holder 53 and the press block 54 are lifted and separated from the cap assembly 3 by the operation of the press drive unit in a state in which the assembly 3 is released from the fixed state.

Subsequently, when the transfer device (not shown) grasps the secondary battery cell 1 again and transfers it to the outside of the placement unit 11, the lead bending molding process for one cycle is completed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the appended claims. And it is to be understood that such modified embodiments belong to the scope of protection of the present invention defined by the appended claims.

1: Secondary battery cell 2: Electrode assembly
3: cap assembly 4: electrode lead
4a: positive electrode lead 4b: negative electrode lead
10: base frame 11:
20: horizontal movement frame 21: first servo motor
22: first ball screw 23: first nut part
30: lift frame 31: second servo motor
32: second ball screw 33: second nut part
40: clamper 41: first pneumatic cylinder
51: lift block 52: cap holder actuator
53: cap holder 54: press block
55: third servo motor 56: third ball screw
57: third nut portion 61: first forming knife
62: second shaping knife 70: electrode support
71: 2nd pneumatic cylinder

Claims (4)

An apparatus for bending a positive electrode lead (4a) and a negative electrode lead (4b) for electrically connecting an electrode assembly (2) of a secondary battery cell (1) and a cap assembly (3)
A base frame (10) having a mounting portion (11) on which a secondary battery cell (1) to be molded is placed;
Two horizontally moving frames 20 installed horizontally reciprocally in opposite directions to each other on both right and left sides of the placement unit 11;
A first servomotor 21 for generating power for horizontally moving the two horizontally moving frames 20 and a second motor 21 for transmitting the power of the first servomotor 21 to the horizontal moving frame 20, A horizontal drive unit including a transfer portion;
A lifting frame 30 installed vertically movably in each of the two horizontal moving frames 20;
Two second servomotors 31 installed in the horizontal moving frame 20 for generating power for moving the lifting frame 30 up and down and a second servomotor 31 for moving the power of the second servomotor 31 to the lifting frame 30 30), and a second power transmission unit (30)
The upper and lower portions of the positive electrode lead 4a and the negative electrode lead 4b are connected to each other by horizontally reciprocating in the directions opposite to each other by the movement of the horizontal moving frame 20 by the horizontal driving unit. A first shaping knife 61 and a second shaping knife 62 for pressing and bending the lower portions in opposite directions to each other;
Two clamper (40) horizontally movably disposed on opposite sides of the base frame (10) in opposite directions from both sides of the placement unit (11) and pressing and fixing the left and right side surfaces of the electrode assembly (2);
A clamper driving unit for horizontally moving the clamper 40 left and right;
A cap supporting unit installed between the two horizontal movement frames 20 to support the cap assembly 3 of the secondary battery cell; And
A third servo motor 55 for generating power for moving the cap supporting unit up and down, and a third power transmitting unit for transmitting the power of the third servo motor 55 to the cap supporting unit.
And an electrode lead forming step of forming the electrode lead forming step. The cap supporting unit according to claim 1,
A lifting block 51 connected to the press driving unit and moving up and down; two cap holders (not shown) horizontally movably provided on both sides of the lifting block 51 to fix left and right sides of the cap assembly 3 A cap holder actuator 52 mounted on the lifting block 51 to horizontally move the cap holder 53 horizontally in opposite directions to each other and a cap holder actuator 52 disposed below the cap holder actuator 52, And a press block (54) which presses the lower electrode (3) downward. 3. The apparatus according to claim 2, wherein when the first shaping knife (61) and the second shaping knife (62) press the cathode lead (4a) and the cathode lead (4b) while the press block (54) (30) also moves downward by a certain distance. The battery pack as claimed in claim 1, wherein both sides of the mounting portion (11) are horizontally movable in opposite directions to the left and right of the base frame (10) so that the positive electrode lead (4a) and the negative electrode lead Two electrode supports 70 for pressing and fixing the lower ends of the electrodes 70; And
A support table drive unit for horizontally moving the electrode support table 70 left and right;
Further comprising: an electrode lead forming step of forming an electrode lead in the secondary battery cell.

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