WO2018030570A1 - Apparatus and method for folding cells for secondary battery - Google Patents

Abstract

The present invention relates to an apparatus and a method for folding cells for a secondary battery and, more particularly, to an apparatus and a method for, when manufacturing a can-type secondary battery, welding a plurality of cells to a lead tab and then folding same so as to enable storage in a can, and forming a buffer section in the lead tab such that damage to a terminal due to vibration can be prevented. The apparatus comprises: a support (100) on which a cap plate (10) is mounted such that a terminal (11) is upwardly exposed; folding jigs (200, 300) foldably connected to both sides of the support (100) and on which cells (20), from which leads (21) are withdrawn toward the center, are respectively mounted; a welding head (400) selectively descending and welding a lead tab (30) to the terminal (11) of the cap plate (10) and the leads (21) of the cells (20); a first bending bar (500) selectively placed on the lead tab (30) and perpendicularly bending the lead tab (30) while the folding jigs (200, 300) are being folded perpendicularly with respect to the support (100); a forming member (600) for inserting a plate-shaped forming tool (610) from both sides of the lead tab (30); and a second bending bar (700) selectively placed on the lead tab (30) and forming a buffer section (31), which has a ⊂-shaped cross section, on the vertical side of the lead tab (30) while the forming tool (610) is being inserted. Therefore, the present invention enables convenient preparation as well as maximum enhancement of the durability and market competitiveness of a product.

Description

Folding device and method of a secondary battery cell

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding device and method for a cell for a secondary battery. In particular, during manufacture of a can-type secondary battery, a plurality of cells are welded to a lead tab and folded to be accommodated in a can, and damage to terminals due to vibration An apparatus and method for forming a buffer section on a lead tab to prevent the present invention, and to improve the manufacturing convenience and to provide an apparatus and method that can maximize the durability and market competitiveness of the product.

In general, a battery refers to a device that converts energy released by these changes into electrical energy using chemical or physical reactions of materials.

Such batteries are classified into chemical cells using chemical reactions and physical cells using physical reactions, and chemical cells are generally used more widely.

Chemical cells can be further classified into primary cells and secondary cells.

The primary battery puts a working substance near the electrode in advance and uses electrical energy generated by chemical change of the substance.

Such a primary battery cannot be regenerated at the end of its life after chemical change of an active substance, and is commonly known as a dry battery.

On the contrary, the secondary battery is widely known as a rechargeable battery that can discharge and regenerate electrical energy after supplying electrical energy to the battery, ie, charging the battery even after the action material changes.

Today, batteries are used for various purposes in various fields according to their characteristics. In particular, the use of secondary batteries includes portable electronic devices such as laptops, smartphones and tablets, as well as transportation vehicles such as electric vehicles and electric bicycles. Its application is expanding exponentially for industrial and mass storage.

Recently, with the development of advanced technology, features such as long-term stability, high energy density, high power density, and long service life are required, and according to the miniaturization of the electronic device itself, the size of the battery is gradually becoming smaller.

The secondary battery may be classified into a pouch type secondary battery packaged in a soft resin film and a can type secondary battery packaged in a hard type metal case.

Pouch type secondary battery has the advantage that the volume is relatively small and the overall light weight, but has the disadvantage that the stability by the external force is poor.

On the other hand, the can-type secondary battery has a disadvantage that the volume is relatively large and the overall weight is heavy, but has a high safety against external force and is widely used.

1 is a perspective view showing a general can type secondary battery, and FIG. 2 is an exploded perspective view showing a general can type secondary battery.

A typical can type secondary battery includes a cap plate 10 having a terminal 11 formed thereon, as shown in FIGS. 1 and 2; A cell 20 into which the lead 21 is drawn out; A lead tab 30 for interconnecting the lead 21 of the cell 20 and the terminal 11 of the cap plate 10; The cell 20 is configured of a can 40 made of a metal material to be folded and accommodated.

In this case, the cell 20 may be a winding cell in which a small capacity unit cell is wound or a stacking cell stacked in multiple layers as illustrated in the drawing.

Here, the use of a plurality of small capacity cells without using one large capacity cell is to satisfy the type approval standard and the like and to increase the safety of use.

That is, in order to insert the plurality of small capacity cells 20 into the can 40 in the related art, the lead 21 of the cell 20 and the terminal 11 of the cap plate 10 are welded to the lead tab 30. Afterwards, it was necessary to fold the cell 20.

However, in the manufacturing of the can-type secondary battery in the related art, the folding operation of the cell 20 as well as the welding is mostly performed by hand, or only a partial automation line is applied, so that the productivity is very low. There was a problem.

In addition, due to the characteristics of the secondary battery, which is frequently carried or moved, shocks and vibrations are repeatedly transmitted from the outside, and since there is no separate configuration that can buffer such shocks and vibrations, There is a problem in the prior art that damage such as short circuit or lead tab itself is easily broken.

The present invention is to solve the above problems, it can be implemented in a form that can be easily inserted into the can of the secondary battery by automatically folding a plurality of cells to increase the manufacturing convenience, while the lead of the cell with such folding Secondary battery cell to maximize the durability and market competitiveness of the product by preventing the damage of the terminal due to vibration by forming a buffer section of approximately U-shaped cross section in the lead tab interconnecting the terminals of the cap plate and the cap plate. It is intended to provide a folding apparatus and method.

Such a folding device for a secondary battery cell of the present invention includes a pedestal on which a cap plate is seated so that a terminal is exposed upward; A folding jig, which is foldably connected to both sides of the pedestal, and in which the cells drawn out of the lead toward the center are respectively seated; A welding head for selectively lowering to weld a lead tab to a terminal of the cap plate and a lead of the cell; A first bending bar that is selectively placed on the lead tab while the folding jig is folded at right angles relative to the pedestal to bend the lead tab at right angles; A molding member for introducing a plate-shaped molding tool from both sides of the lead tab; It is achieved by including a second bending bar that is selectively placed on the lead tab during entry of the forming tool to form a cushioning section of U-shaped cross section on a vertical surface of the lead tab.

Here, the welding head may perform ultrasonic welding by oscillating ultrasonic waves, and may be connected to a lifting member including an actuator.

In addition, the first bending bar has a rectangular cross section; The second bending bar has a U-shaped cross section; The first bending bar and the second bending bar may be connected to a transfer member including an actuator for forward and retreat, respectively.

In addition, the conveying member connected to the first bending bar and the conveying member connected to the second bending bar are connected to each other by a connecting member and guided to be moved in a straight line on the same guide rail, and alternately in a line with the longitudinal direction of the pedestal. It is desirable to be able to align.

In addition, the folding jig is foldable by being connected to a folding member including an actuator; It is most preferable that the pedestal is connected to the supporting member including the actuator and can be elevated.

Next, the folding method of the secondary battery cell of the present invention, the cap plate loading step of placing the cap plate on the pedestal; A lead tab loading step of placing a lead tab over a terminal on the cap plate; A cell loading step of placing the cells with the leads drawn out on the folding jigs connected to both sides of the pedestal so that the leads are placed on both sides of the lead tabs, respectively; A welding step of lowering a welding head to weld the lead tabs to the terminals of the cap plate and the leads of the cells, respectively; Placing a first bending bar on the lead tab, and folding the folding jig to bend the lead tab at a right angle; A buffer section for removing the first bending bar from the lead tab and positioning the second bending bar instead, and then advancing a plate-shaped forming tool on both sides to form a cushioning section having a U-shaped cross section on a vertical surface of the lead tab. It is achieved by constructing a molding step.

The present invention as described above can be implemented in a form that can be easily inserted into the can of the secondary battery by automatically folding a plurality of cells to improve the manufacturing convenience, while the terminal of the lead and the cap plate of the cell together with such folding By forming a buffer section of approximately U-shaped cross section in the lead tab to be interconnected, it is possible to prevent damage to the terminal due to vibration in advance, thereby maximizing the durability and market competitiveness of the product.

1 is a perspective view showing a typical can type secondary battery;

2 is an exploded perspective view showing a typical can type secondary battery;

3 is a perspective view showing a folding device of a secondary battery cell of the present invention;

4 is a perspective view showing a state immediately before a folding step in the folding method for a secondary battery cell of the present invention;

5 is a perspective view showing a state immediately after the folding step in the folding method for a secondary battery cell of the present invention;

6 is a perspective view of a main portion showing a state immediately after the folding step in the folding method for a secondary battery cell of the present invention;

7 is a perspective view showing a buffer section forming step in the folding method of a secondary battery cell of the present invention;

8 is a bottom perspective view showing a buffer section forming step in the folding method of a secondary battery cell of the present invention;

9 is a plan view showing a connecting member and a guide rail in a folding device for a secondary battery cell of the present invention;

10 is an enlarged perspective view of a main portion showing a lead tab in which a buffer section is formed according to a folding device and method for a secondary battery cell of the present invention;

11 is a flowchart showing a folding method of a cell for a secondary battery of the present invention.

[Description of the code]

10 cap plate 11 terminal

20: cell 21: lead

30: lead tap 31: buffer section

100: pedestal 110: support member

200, 300: folding jig 210, 310: folding member

400: welding head 410: elevating member

500: first bending bar 510: transfer member

600: forming member 610: forming tool

700: second bending bar 710: transfer member

810: connecting member 820: guide rail

S10: cap plate loading step S20: lead tap loading step

S30: cell loading step S40: welding step

S50: folding step S60: buffer section forming step

Figure 3 is a perspective view showing a folding device of a secondary battery cell of the present invention, Figure 4 is a perspective view showing a state immediately before the folding step in the folding method of a secondary battery cell of the present invention, Figure 5 is a present invention It is a perspective view which shows the state immediately after a folding step in the folding method of the secondary battery cells.

6 is a principal part perspective view showing a state immediately after the folding step in the folding method for a secondary battery cell of the present invention.

7 is a perspective view showing a buffer section forming step in the folding method of the secondary battery cell of the present invention, Figure 8 is a bottom surface showing a buffer section forming step in the folding method of the secondary battery cell of the present invention. Perspective view.

FIG. 9 is a plan view illustrating a connecting member and a guide rail in a folding device for a secondary battery cell of the present invention, and FIG. 10 illustrates a lead tab in which a buffer section is formed according to the folding device and method for a secondary battery cell of the present invention. It is an enlarged perspective view of main part shown, and FIG. 11 is a flowchart which shows the folding method of the cell for secondary batteries of this invention.

Specific structural or functional descriptions presented in the embodiments of the present invention are only illustrated for the purpose of describing the embodiments according to the inventive concept, and the embodiments according to the inventive concept may be implemented in various forms. In addition, it should not be construed as limited to the embodiments described herein, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Meanwhile, terms such as first and / or second in the present invention may be used to describe various components, but the components are not limited to the terms. The above terms are for the purpose of distinguishing one component from other components only, for example, within the scope not departing from the scope of the right according to the concept of the present invention, the first component may be called a second component, Similarly, the second component may also be referred to as the first component.

When a component is referred to as being "connected" or "connected" to another component, it is to be understood that the component may be directly connected or connected to that other component, but other components may be present in between. something to do. On the other hand, when a component is said to be "directly connected" or "directly contacted" to another component, it should be understood that there is no other component in between. Other expressions for describing relationships between components, such as "between" and "immediately between" or "adjacent to" and "directly adjacent to," should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. The terms "comprises" or "having" in this specification are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof that is implemented, and that one or more other features or numbers, It is to be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, parts or combinations thereof.

The folding device and method of the secondary battery cell of the present invention can be implemented in a form that can be easily inserted into the can of the secondary battery by automatically folding a plurality of cells 20, while improving the manufacturing convenience, such folding and Damage to the terminal due to vibration by forming a buffer section 31 of approximately U-shaped cross section in the lead tab 30 interconnecting the lead 21 of the cell 20 and the terminal 11 of the cap plate 10 together. It can be prevented in advance, so that the durability and market competitiveness of the product can be maximized.

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, as shown in FIGS. 3 to 8, the folding device for the secondary battery cell of the present invention includes: a pedestal 100 on which the cap plate 10 rests so that the terminal 11 is exposed upward; Folding jigs 200 and 300 which are connected to both sides of the pedestal 100 so that the cells 20 into which the leads 21 are drawn toward the center are respectively seated; A welding head 400 for selectively lowering and welding the lead tab 30 to the terminal 11 of the cap plate 10 and the lead 21 of the cell 20; The first bending bar for selectively bending the lead tab 30 is placed on the lead tab 30 while the folding jig 200, 300 is folded at a right angle with respect to the pedestal 100. 500); A molding member (600) for entering the plate-shaped forming tool (610) from both sides of the lead tab (30); A second bending bar 700 which is selectively placed on the lead tab 30 while the forming tool 610 enters to form a buffer section 31 having a U-shaped cross section on a vertical surface of the lead tab 30. It is preferable to include).

That is, the folding device of the secondary battery cell of the present invention is largely the pedestal 100, the folding jig 200, 300, the welding head 400, the first bending bar 500, the forming member 600, and Two bending bars 700 are included.

In this case, the folding jig 200, 300, the first bending bar 500, the molding member 600, and the second bending bar 700 are arranged in pairs symmetrically with respect to the pedestal 100. Will be.

In the present invention, the cell 20 used for manufacturing a can type secondary battery is a winding cell in which a small capacity unit cell is wound or a stacking cell stacked in multiple layers as illustrated in the drawing. )would.

That is, in the folding device of the secondary battery cell of the present invention, a plurality of small capacity unit cells 20 are welded to the cap plate 10 through the lead tab 30 and then folded to insert the can 40 into the can 40. This lead tab 30 is characterized in that the buffer section 31 is formed as shown in FIG.

First, the pedestal 100 is formed of a substantially rectangular plate material and arranged horizontally, and the cap plate 10 corresponding to the lid of the can 40 is seated on the upper portion thereof.

At this time, the cap plate 10 is placed on the pedestal 100 in an inverted state as shown in FIG. 3 so that the bottom surface of the cap plate 10 faces upward.

Next, the folding jig 200, 300 is configured to be folded on each side of the pedestal 100 in the form of wings, respectively, the folding jig 200, 300 is also approximately square, more preferably below The cell 20 to be described is made of a plate of a shape that can be seated.

It may be desirable to form protrusions at the corners of the folding jig 200 and 300 so that the loaded cells 20 do not flow.

The folding jig 200 and 300 may form a frame in which a part of the plate is cut or a hole is formed for weight reduction.

At this time, the pedestal 100 and the folding jig 200, 300 are connected to each other through the same configuration as the hinge 101, the pedestal in the state where the folding jig 200, 300 is horizontally positioned The plane is formed around 100.

On the other hand, when the folding jig (200, 300) is rotated upward with respect to the hinge 101, it can be transformed into a substantially U-shape.

In the folding jig 200 and 300, the cells 20 in which a plurality of small capacity unit cells in which the leads 21 are drawn toward the center are stacked are respectively seated.

That is, the cell 20 is seated in a state in which the folding jig 200 and 300 are horizontally positioned. Then, as the folding jig 200 and 300 are folded vertically, the folding of the cell 20 is performed. It can be done.

Next, the welding head 400 is configured in a shape corresponding to the cap plate 10 to be selectively lowered.

In this case, the welding head 400 performs welding on the lead tab 30 positioned between the terminal 11 of the cap plate 10 and the lead 21 of the cell 20.

This welding enables the connection between the terminal 11 of the cap plate 10 and the lead tab 30 and the connection between the lead tab 30 and the lead 21 of the cell 20.

At this time, there is no limitation on the type of welding performed by the welding head 400.

Here, the lead tab 30 has a function of supplying power from the terminal 11 of the cap plate 10 to the lead 21 of the cell 20 when the secondary battery is being charged, and the cell when the secondary battery is used. It serves to supply power from the lead 21 of the 20 to the terminal 11 of the cap plate 10.

The lead tab 30 has a certain amount of elasticity so as to be elastically deformable to a minute impact or vibration, but above all, is made of a substantially rectangular conductive metal sheet material capable of plastic deformation.

In this case, the welding head 400 may perform ultrasonic welding by oscillating ultrasonic waves, and may be connected to the elevating member 410 including an actuator.

That is, the welding head 400 is preferably ultrasonic welding performed by the vibration energy and the appropriate pressure by the ultrasonic wave by oscillating the ultrasonic wave among various welding methods, it is possible to quickly and accurately weld within a short time .

In addition, the upper side surface of the welding head 400 is connected to the lifting member 410 including the actuator, the lifting of the welding head 400 is made in accordance with the operation of the lifting member 410.

Therefore, when the cap plate 10, the lead tab 30, and the cell 20 are loaded, the welding head 400 is maintained by the elevating member 410.

On the other hand, the welding head 400 is temporarily lowered by the elevating member 410 only when ultrasonic welding is performed.

Here, the actuator constituting the elevating member 410 may be a hydraulic actuator using pneumatic or hydraulic pressure as a driving source, or may be a solenoid actuator using a power source as the driving source.

That is, there is no restriction on the drive source of the actuator.

Next, the first bending bar 500 is the lead tab 30 while the folding jig 200, 300 is folded at right angles relative to the pedestal 100, as shown in Figures 4 to 6 It is a configuration for bending the lead tab 30 at right angles selectively placed on the).

Although FIG. 5 illustrates the pedestal 100 and the folding jig 200, 300, the pedestal 100 and the folding jig 200, 300 are illustrated in FIGS. 4 and 6 to show the folding of the cell 20 in detail. ) Is not shown.

That is, the first bending bar 500 may prevent the lead tab 30 from moving from the cap plate 10 while the cell 20 is folded, and both lower edge portions of the first bending bar 500 may be connected to the lead tab 30. ) Corresponds to the configuration to bend at right angles.

The first bending bar 500 is selectively placed on the pedestal 100.

That is, when loading or welding various components on the pedestal 100, the first bending bar 500 is spaced apart from the pedestal 100 as shown in FIG. 9.

However, when the folding jig 200, 300 is folded based on the pedestal 100, the first bending bar 500 is positioned on the lead tab 30.

Next, the molding member 600 corresponds to a configuration for entering the plate-shaped forming tool 610 in a horizontal state from both sides of the lead tab 30, as shown in Figure 7 and 8, the pedestal ( It consists of a pair of opposing sides on the basis of 100).

Here, the forming tool 610 may be made of a plate having a predetermined thickness.

The molding tool 610 has a branched branch shape so as to plastically deform two lead tabs 30 respectively connected to the two terminals 11 of the cap plate 10 at one time.

Accordingly, the branched end of the forming tool 610 substantially forms the buffer section 31 in the lead tab 30, and the buffer section 31 corresponding to the thickness of the forming tool 610. Is formed.

At this time, the driving source of the forming member 600 may be a hydraulic actuator using pneumatic or hydraulic pressure, and a solenoid actuator using a power source as the driving source may be possible.

Therefore, in general, the forming tool 610 is spaced apart from the lead tab 30 by the forming member 600, but the forming tool 610 may be advanced by the forming member 600. In this case, an end portion of the forming tool 610 plastically deforms the lead tab 30 to form a buffer section 31.

In this way, the configuration supporting the inner side so that the buffer section 31 is formed in the lead tab 30 by the molding member 600 is the second bending bar 700 to be described below.

The second bending bar 700 is selectively placed on the lead tab 30 while the forming tool 610 enters a buffer section 31 having a U-shaped cross section on a vertical surface of the lead tab 30. Allow molding.

The second bending bar 700 is selectively placed on the pedestal 100 in place of the first bending bar 500 described above.

That is, the second bending bar 700 is normally kept spaced apart from the pedestal 100, but when the forming tool 610 advances to form the buffer section 31, the second bending bar ( 700 is located on the pedestal 100.

As a result, the buffer section 31 may be molded in the lead tab 30 positioned between the forming tool 610 and the second bending bar 700.

To this end, in the present invention, the first bending bar 500 has a rectangular cross section; The second bending bar 700 has a U-shaped cross section; The first bending bar 500 and the second bending bar 700 may be connected to the transfer members 510 and 710 including actuators, respectively, for moving forward and backward.

That is, the above-mentioned first bending bar 500 may have a substantially rectangular cross section in which both lower edge portions thereof are formed at right angles.

Accordingly, when the folding jig 200, 300 is folded, the lead tab 30 may be formed at a right angle.

Alternatively, the second bending bar 700 has a function of pressing the lead tab 30 on the cap plate 10 on the bottom thereof, and has a cross section of approximately U-shape so that the vertical surface thereof is positioned corresponding to the forming tool 610. It would be desirable.

Accordingly, while the forming tool 610 forms the buffer section 31 in the lead tab 30, the vertical surface of the second bending bar 700 restricts the advancing of the forming tool 610 from the inside, and the horizontal surface is The lead tab 30 will be prevented from moving.

At this time, the driving source of the conveying members 510 and 710 may also be a hydraulic actuator using pneumatic or hydraulic pressure, and a solenoid actuator using a power source as the driving source may be possible.

In the present invention, when the folding jig 200, 300 is folded, the first bending bar 500 needs to be positioned on the lead tab 30, and at the time of forming the buffer section 31, the lead tab ( The second bending bar 700 needs to be positioned on the 30 instead of the first bending bar 500.

Accordingly, in the present invention, as shown in FIG. 9, the transfer member 510 connected to the first bending bar 500 and the transfer member 710 connected to the second bending bar 700 are connected to the connection member 810. It is preferable that the interconnection is guided so as to be linearly movable on the same guide rail 820, and can be aligned in alternation with the longitudinal direction of the pedestal 100.

That is, in the present invention, the guide rails 820 are formed side by side on both sides of the pedestal 100, and the transfer member 510 and the second bending bar connected to the first bending bar 500 on the guide rails 820. The conveying member 710 connected to 700 may be guided in a straight line.

In addition, the transfer member 510 of the first bending bar 500 and the transfer member 710 of the second bending bar 700 are connected to each other by a connecting member 810 such as a connecting rod.

According to this, the second bending bar 700 is spaced apart while the first bending bar 500 is positioned on the lead tab 30, or, conversely, the second bending bar 700 is positioned on the lead tab 30. It is easier to control the first bending bar 500 to be spaced apart while being located at.

Here, the guide rail 820 may be a well-known configuration capable of guiding the transfer members 510 and 710 in a straight line.

Finally, in the present invention, as shown in Figure 5, the folding jig (200) 300 is connected to the folding member (210) (310) including the actuator can be folded; As shown in FIG. 7 and FIG. 8, the pedestal 100 may be connected to the supporting member 110 including the actuator to be elevated.

First, the folding members 210 and 310 are configured to horizontally position or vertically fold the above-described folding jigs 200 and 300. As a driving source, a hydraulic actuator may be used using pneumatic or hydraulic pressure. For example, a solenoid actuator using a power source as a driving source may be possible.

That is, the folding jig 200, 300 is operated according to the driving of the folding member 210, 310.

In this case, if the height of the pedestal 100 is fixed, the stroke of the folding members 210 and 310 will need to be designed to be relatively long.

However, in the present invention, while the folding members 210 and 310 are driven to fold the folding jig 200 and 300 horizontally or vertically, the above-described pedestal 100 is supported by the support member 110. It is possible to move up and down.

In this case, the support member 110 may be a hydraulic actuator using pneumatic or hydraulic pressure as a driving source, or may be a solenoid actuator using a power source as a driving source.

As a result, the pedestal 100 is raised by the support member 110 while the folding jig 200 and 300 are horizontally positioned, and the folding jig 200 and 300 is vertically folded. The pedestal 100 is lowered by the support member 110.

Accordingly, it is possible to design a relatively short operating stroke of the folding member (210) (310).

Next, the folding method of the secondary battery cell of the present invention, as shown in Figure 11, the cap plate loading step (S10) for placing the cap plate 10 on the pedestal 100; A lead tab loading step (S20) of placing the lead tabs 30 on the terminals 11 on the cap plate 10; The leads 20 are placed on the folding jigs 200 and 300 connected to both sides of the pedestal 100 so that the leads 21 are placed on both sides of the lead tab 30, respectively. A cell loading step (S30); A welding step (S40) of lowering the welding head 400 to weld the lead tab 30 to the terminal 11 of the cap plate 10 and the lead 21 of the cell 20, respectively; Placing the first bending bar 500 on the lead tab 30 and then folding the folding jig 200 and 300 to bend the lead tab 30 at a right angle; After removing the first bending bar 500 from the lead tab 30 and placing the second bending bar 700 instead, the plate-shaped forming tool 610 is advanced on both sides of the lead tab 30. It is preferable that the buffer section forming step (S60) for forming the buffer section 31 of the U-shaped cross section on the vertical surface of the).

The operation of the folding device of the secondary battery cell of the present invention configured as described above will be described in detail step by step according to the folding method of the secondary battery cell of the present invention.

First, in the cap plate loading step (S10), the cap plate 10 is placed on the pedestal 100 as shown in FIG.

At this time, the folding jig 200, 300 based on the pedestal 100 is maintained in a horizontal state by the folding member 210, 310.

Here, the cap plate 10 is placed in reverse so that the terminal 11 provided on the bottom thereof is exposed upward.

In addition, the loading of the cap plate 10 may be automatically performed by a known loading device (not shown).

Next, in the lead tab loading step S20, the lead tab 30 is further placed on the cap plate 10 placed on the pedestal 100 through the cap plate loading step S10 described above.

In this case, the lead tabs 30 are placed on the two terminals 11 exposed to the cap plate 10, respectively.

In this case, it is preferable that the loading of the lead tab 30 is performed automatically by a known loading device.

Next, in the cell loading step S30, the cells 20 are loaded on the folding jigs 200 and 300 positioned horizontally by the folding members 210 and 310.

At this time, the cell 20 loaded on the folding jig 200 and 300 is positioned so that the lead 21 faces the center, so that the lead 21 is placed on the lead tab 30.

This, the loading of the cell 20 may also be made automatically by a known loading device, not shown.

Next, in the welding step (S40), the welding head 400 positioned above the pedestal 100 is lowered through the elevating member 410, so that the cap plate 10 is sequentially stacked on the pedestal 100. The terminal 11, the lead tab 30, and the lead 21 of the cell 20 are welded.

More specifically, the center of the lead tab 30 and the terminal 11 of the cap plate 10 are ultrasonically welded to each other, and both edges of the lead tab 30 and the leads 21 of the cell 20 are ultrasonically welded. Ultrasonic welding with each other.

After such welding step (S40), after placing the first bending bar 500 on the lead tab 30 through the folding step (S50), as shown in Figure 4 to 6, folding jig 200, 300 ) To bend the lead tab 30 at right angles.

In this case, the first bending bar 500 maintains a state spaced apart from the pedestal 100 by the transfer member 510 before the folding step S50, and then, by the transfer member 510 in the folding step S50. By advancing, it is positioned on the lead tab 30.

As such, when the first bending bar 500 is positioned on the lead tab 30, the folding jigs 200 and 300 which are horizontally positioned on both sides of the pedestal 100 are vertically formed by the folding members 210 and 310. Will be folded.

In addition, the height of the pedestal 100 is lowered by the support member 110 connected to the lower portion of the pedestal 100, so that even if the stroke of the folding members 210 and 310 is relatively short, the folding jig 200 ( 300 may be positioned vertically relative to the pedestal (100).

Through this folding step (S50) the center bottom surface of the lead tab 30 is welded to the terminal 11 of the cap plate 10 is fixed as it is, while both ends of the lead tab 30 of the cell 20 It is bent at right angles along the lead 21.

At this time, bending of the lead tab 30 will be made by both lower edges of the first bending bar 500.

Finally, in the buffer section forming step (S60), the first bending bar 500 is removed from the lead tab 30, and the second bending bar 700 is positioned instead.

This operation connects each other to the connection member 810 with respect to the transfer members 510 and 710 for advancing or retracting the first bending bar 500 and the second bending bar 700 as shown in FIG. It may be implemented by guiding the members 510 and 710 on the guide rail 820.

That is, after the first bending bar 500 is spaced apart from the pedestal 100 by the transfer member 510, when the first bending bar 500 moves along the guide rail 820, the second bending bar 700 is aligned with the pedestal 100. Will sort on.

Subsequently, in a state in which the second bending bar 700 is advanced to the transfer member 710 and again positioned on the lead tab 30, the plate-shaped forming tool 610 is advanced on both sides as shown in FIGS. 7 and 8. A buffer section 31 having a substantially U-shaped cross section is formed on a vertical surface of the lead tab 30.

The buffer section 31 is formed by a plate-shaped forming tool 610 positioned outside with the lead tab 30 therebetween and a second bending bar 700 located therein.

In this way, the folding cell 20 is inserted into the can 40 made of a metal material in a later step to complete the can-type secondary battery product.

As a result, in the buffer section 31 formed in the lead tab 30 as shown in FIG. It is possible to effectively prevent the short circuit from the lead 11 of the cell 11 or the cell 20 or the lead tab 30 itself to be disconnected.

Therefore, the folding device and method of the secondary battery cell of the present invention can be implemented in a form that can be easily inserted into the can 40 of the secondary battery by automatically folding a plurality of small capacity unit cells 20 manufacturing convenience Has the effect of greatly improving.

In addition, by forming a buffer section 31 having a substantially U-shaped cross section in the lead tab 30 interconnecting the lead 21 of the cell 20 and the terminal 11 of the cap plate 10 together with such folding. It is an invention having an excellent advantage that can prevent damage to the terminal due to vibration in advance, thereby maximizing the durability and market competitiveness of the product.

The above embodiment is an example for explaining the technical idea of the present invention in detail, and the scope of the present invention is not limited to the above drawings and embodiments.

The present invention as described above can be implemented in a form that can be easily inserted into the can of the secondary battery by automatically folding a plurality of cells to improve the manufacturing convenience, while the terminal of the lead and the cap plate of the cell together with such folding By forming a buffer section of approximately U-shaped cross section in the lead tab to be interconnected, it is possible to prevent damage to the terminal due to vibration in advance, thereby maximizing the durability and market competitiveness of the product.

Claims (6)

A pedestal on which the cap plate rests so that the terminal is exposed upward; A folding jig, which is foldably connected to both sides of the pedestal, and in which the cells drawn out of the lead toward the center are respectively seated; A welding head for selectively lowering to weld a lead tab to a terminal of the cap plate and a lead of the cell; A first bending bar that is selectively placed on the lead tab while the folding jig is folded at right angles relative to the pedestal to bend the lead tab at right angles; A molding member for introducing a plate-shaped molding tool from both sides of the lead tab; And a second bending bar which is selectively placed on the lead tab while the forming tool enters to form a buffer section of a U-shaped cross section on a vertical surface of the lead tab. The apparatus of claim 1, wherein the welding head oscillates ultrasonic waves to perform ultrasonic welding, and is connected to a lifting member including an actuator. The method of claim 2, The first bending bar has a rectangular cross section; The second bending bar has a U-shaped cross section; And the first bending bar and the second bending bar are connected to a transfer member including an actuator for forward and retreat, respectively. The method of claim 3, The conveying member connected to the first bending bar and the conveying member connected to the second bending bar are connected to each other by a connecting member, are guided to be moved in a straight line on the same guide rail, and can be alternately aligned in a line with the longitudinal direction of the pedestal. Folding device for cells for secondary batteries, characterized in that. The method of claim 4, wherein The folding jig is foldable connected to a folding member including an actuator; The pedestal is connected to the support member including an actuator, the folding device of the secondary battery cell, characterized in that the lifting possible. A cap plate loading step of placing the cap plate on the pedestal; A lead tab loading step of placing a lead tab over a terminal on the cap plate; A cell loading step of placing the cells with the leads drawn out on the folding jigs connected to both sides of the pedestal so that the leads are placed on both sides of the lead tabs, respectively; A welding step of lowering a welding head to weld the lead tabs to the terminals of the cap plate and the leads of the cells, respectively; Placing a first bending bar on the lead tab, and folding the folding jig to bend the lead tab at a right angle; A buffer section for removing the first bending bar from the lead tab and positioning the second bending bar instead, and then advancing a plate-shaped forming tool on both sides to form a cushioning section having a U-shaped cross section on a vertical surface of the lead tab. Method for folding a secondary battery cell, characterized in that consisting of a molding step.

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