KR20190056812A - Lamination apparatus and method for secondary battery - Google Patents

Abstract

The present invention relates to a lamination apparatus for a secondary battery, which comprises: an electrode supply device for supplying an electrode; a separation membrane supply device for supplying a separation membrane; a combining device comprising a combining member for combining the electrode supplied by the electrode supply device and the separation membrane supplied by the separation membrane supply device and preventing tilting by primary bonding, and a transfer member for transferring the primarily bonded electrode and the separation membrane; and a laminator for secondarily bonding and laminating the primarily bonded electrode and the separation membrane transferred by the transfer member. The tilting of the electrodes is prevented so that the deviation of the intervals between the electrodes is kept constant.

Description

TECHNICAL FIELD [0001] The present invention relates to a lamination apparatus and a method for a secondary battery,

The present invention relates to a lamination apparatus and method for a secondary battery, and more particularly, to a lamination apparatus and a method for a secondary battery having an increased coherence between an electrode and a separator.

2. Description of the Related Art Generally, a secondary battery is a battery capable of being charged and discharged unlike a primary battery which can not be charged, and is widely used in electronic devices such as mobile phones, notebook computers, camcorders, and electric vehicles.

The secondary battery includes an electrode assembly having an electrode tab, an electrode lead coupled to the electrode tab, and a case accommodating the electrode assembly with the tip of the electrode lead drawn out to the outside, And a separator are stacked alternately, or a stack of unit elements in which a plurality of the basic unit bodies are stacked.

Here, the electrode assembly performs a lamination process to increase the bonding force, and the lamination process includes cutting the electrode, combining the cut electrode with the separator, transporting the cut electrode and separating the combined electrode and separator, And a lamination step of bonding.

However, in the lamination process, there is a problem that tilting of the electrode occurs in the process of aligning the cut electrode and the separator. Thus, irregular intervals occur between the electrodes which are put on the separator, .

Patent Publication No. 10-2016-0040087

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method of manufacturing a plasma display panel in which electrodes and a separator are bonded to each other to prevent tilting of the electrode, The present invention is to provide a lamination apparatus and method for a secondary battery which can maintain the gap between the electrodes constant and thus prevent the production of a defective electrode assembly.

According to an aspect of the present invention, there is provided a lamination apparatus for a secondary battery, including: an electrode supply device for supplying an electrode; A separation membrane feeder for feeding the separation membrane; A combining member for matching the electrode supplied by the electrode supplying device and the separating film supplied by the separating film supplying device and for preventing the tilting by primary bonding to each other, A joining device having a conveying member; And a laminator for performing secondary bonding and lamination of the primary bonded electrode transferred by the transfer member and the separator.

Wherein the combining member includes a first heating unit for heating the separation membrane supplied by the separation membrane feeding device and an electrode supplied by the electrode feeding device together with the separation membrane heated by the first heating unit, And a first pressurizing roller that carries out the second pressurizing operation.

The first heating unit may include a first heating roller supported on the inner surface of the separation membrane, which is in close contact with the electrode, and has a heating unit heating the inner surface of the separation membrane.

The first pressure roller can press the outer surface of the separation membrane that has not been preheated by the first heating roller.

The first heating unit may further include a second heating roller having a heating unit for heating and heating the inner surface of the separation membrane wound around the first pressure roller.

Wherein the first heating roller guides the separation membrane advancing in the first direction to move in a second direction which is turned by 90 degrees in the first direction and the second heating roller guides the separation film moving in the second direction from the first heating roller And the first pressing roller can guide the separation membrane moving in the second direction to move in the third direction which is turned 180 degrees in the second direction.

The first heating roller and the second heating roller can heat the inner surface of the separation membrane at the same temperature.

The heating unit may be formed on the entire surface of the first heating roller and the second heating roller to heat the entire inner surface of the separation membrane so that the entire adhesion surface of the separation membrane and the electrode are bonded.

The heating unit may be formed on a part of the main surface of the first heating roller and the second heating roller so that only a part of the inner surface of the separating film is heated so that only a part of the contact surface between the separating film and the electrode is bonded.

The conveying member may be provided as a feeding belt.

The laminator further includes a second heating unit for preheating the primary bonding electrode and the separation membrane transferred by the transfer member by applying heat to the separation membrane and a second heating unit for preheating the primary bonding electrode and the separation membrane preheated by the second heating unit, And a second pressure roller for lamination.

Meanwhile, a lamination method for a secondary battery according to an embodiment of the present invention includes: a supply step (S10) of supplying an electrode and a separator; A first step of joining the electrode supplied by the supplying step and the separation membrane and simultaneously performing a primary bonding to prevent tilting and a second step of transferring the primary bonded electrode and the separation membrane, Step S20; And a lamination step (S30) for secondary bonding and lamination the separator and the primary bonded electrode transferred by the aligning and transferring step.

The first step may preheat the separation membrane supplied by the supply step, and the preheated separation membrane and the electrode supplied by the supply step may be aligned and primary bonded together.

In the first step, heat can be applied to the inner surface of the separation membrane which is in close contact with the electrode to preheat.

According to another aspect of the present invention, there is provided a lamination apparatus for a secondary battery, including: an electrode supply device for supplying an electrode; A separation membrane supplying device for supplying a separation membrane to cover both sides of the electrode; A combining member for matching the electrode supplied by the electrode supplying device and the separating film supplied by the separating film supplying device and for preventing the tilting by primary bonding to each other, A joining device having a conveying member; And a laminator for secondary bonding the separator to the primary bonded electrode carried by the transfer member to complete the laminated secondary battery. In the laminated secondary battery completed by the laminator, both surfaces of the electrode are separated by a separator And a fusion bonding adhering portion continuously fused between an inner peripheral portion and an outer peripheral portion of the fusion bonding portion or adjacent fusion bonding portions of the fusion bonding portions is provided, The separator can be sealed.

The present invention has the following effects.

First, the lamination apparatus for a secondary battery of the present invention is characterized in that it includes a coalescing device provided with a coalescing member. With this feature, the supplied electrode and the separator can be aligned and primary bonded together, It is possible to prevent the electrode from being tilted and to keep the gap between the electrodes constant. As a result, it is possible to prevent the defective electrode assembly from being manufactured.

Secondly, in the lamination apparatus for a secondary battery of the present invention, the coalescing member includes a first heating unit for heating the separator, and a first pressure roller for coalescing the first electrode and the first electrode, With this feature, the separator and the electrode can be stably aligned and bonded at the same time. In particular, the separation membrane can be more stably bonded to the separation membrane by heating the separation membrane before the separation, and as a result, the tilting of the electrode placed on the separation membrane can be greatly prevented.

Thirdly, in the lamination apparatus for a secondary battery of the present invention, the first heating unit includes a first heating roller which supports and heats the inner surface of the separation membrane which is in close contact with the electrode. With this feature, The bonding force between the electrode and the separator can be greatly increased as the inner surface of the separator bonded to the electrode is heated. On the other hand, the first heating roller transfers the separation membrane through a rotating force, thereby increasing the feeding force of the separation membrane.

Fourthly, in the lamination apparatus for a secondary battery according to the present invention, the first pressing roller presses the outer surface of the separation membrane that has not been preheated by the first heating roller, and this feature prevents the bonding strength of the inner surface of the separation membrane .

Fifthly, in the lamination apparatus for a secondary battery of the present invention, the first heating unit includes a second heating roller for pressing and heating the inner surface of the separation membrane wound on the first pressure roller, The adhesive force can be increased by heating the separation membrane while adjusting the tension of the separation membrane, thereby greatly increasing the bonding force between the electrode and the separation membrane.

Sixthly, in the lamination apparatus for a secondary battery of the present invention, the first and second heating rollers are characterized by heating the inner surface of the separation membrane at the same temperature. Due to this feature, the inner surface of the separation membrane is maintained at a constant temperature So that the bonding force between the electrode and the separator can be uniformly maintained.

Seventh: In the lamination apparatus for a secondary battery of the present invention, the first and second heating rollers include a heating unit on the main surface, and the heating unit is formed on the entire or a part of the main surface of the first and second heating rollers. The entire inner surface of the separator may be heated to bond the entire adhered surface of the separator with the electrode by heating the part of the inner surface of the separator. Accordingly, the adhesion area between the electrode and the separator can be adjusted according to the applied product.

Eighth: In the lamination apparatus for a secondary battery according to the present invention, the aligning device includes a conveying member, and the conveying member is provided as a fitting belt. With this feature, it is possible to more reliably convey the aligned electrode and the separating membrane have.

Ninth: A lamination apparatus for a secondary battery according to the present invention includes a laminator for thermally bonding a coherent electrode and a separator, wherein the laminator includes a second heating unit for preheating the coherent electrode and the separator to a second order, a second preheating electrode, And the second pressure roller for pressurizing and laminating the first pressure roller and the second pressure roller, and the adhesion surface of the electrode and the separation membrane can be perfectly bonded due to this feature.

1 is a front view schematically showing a laminating apparatus for a secondary battery according to a first embodiment of the present invention.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a lamination apparatus for a secondary battery.
Fig. 3 is a perspective view showing the mating member of the mating device shown in Fig. 2; Fig.
4 is a cross-sectional view taken along the line AA shown in Fig.
5 is a flowchart showing a lamination method for a secondary battery according to the first embodiment of the present invention.
FIG. 6 is a perspective view showing a coalescing device of a lamination apparatus for a secondary battery according to a second embodiment of the present invention. FIG.
7 is a cross-sectional view taken along line BB of Fig.
FIG. 8 is a perspective view illustrating a laminated secondary battery manufactured through a lamination apparatus for a secondary battery according to a third embodiment of the present invention. FIG.
9 is a plan view showing an electrode covered with a separation membrane.
10 is a plan view for explaining a method of manufacturing a laminated secondary battery.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

[First In the embodiment  For secondary batteries Lamination  Device]

The lamination apparatus for a secondary battery according to the first embodiment of the present invention has a structure in which the electrode and the separator are joined to each other in a process of aligning electrodes and a separator for thermal bonding.

For example, as shown in FIG. 1, the lamination apparatus for a secondary battery according to the first embodiment of the present invention includes an electrode supply device 100 for supplying an electrode 10, a separator supplying a separator 20 The apparatus 200 includes a confluence device 300 for matching and simultaneously performing primary bonding of the electrode 10 supplied by the electrode supply device 100 and the separation membrane 20 supplied by the separation membrane supply device 200, And a laminator 400 for joining the electrode 10 and the separation membrane 20 to each other in a second order by the alignment device 300.

Electrode feeder

The electrode feeder 100 is an electrode feeder for feeding an electrode and includes an electrode winding roller for feeding the wound electrode sheet, a driving motor for rotating the winding roller so that the electrode sheet wound on the winding roller is fed, And a cutter 110 for cutting the electrode sheet supplied from the rollers to a predetermined size. On the other hand, the electrode may be an anode or a cathode.

Membrane feeder

The separation membrane feeder 200 is provided for feeding a separation membrane and includes a separation membrane winding roller for feeding the separation membrane 20 wound thereon and a separator film feeder for feeding the separation membrane 20 wound therearound, And a drive motor.

1, the separator feeder 200 is provided on the top and bottom surfaces of the electrode 10 supplied from the electrode feeder 100, The separation membrane 20 is supplied so that the separation membrane 20 is laminated.

Coalescing device

As shown in FIG. 2 and FIG. 3, the confluence device 300 is for bonding and primary bonding the electrode and the separator. The electrode 10 and the electrode 10, which are supplied by the electrode supply device 100, And a joining member 310 for joining the separation membrane 20 supplied by the separation membrane feeder 200 and for primary bonding to prevent tilting of the electrode 10.

The combining member 310 includes a first heating portion 311 for heating the separation membrane 20 supplied by the separation membrane feeder 200 and a second heating portion 311 for heating the separation membrane 20 heated by the first heating portion 311 And a first pressurizing roller 312 for aligning and first-joining the electrode 10 supplied by the electrode feeder 100.

The first heating portion 311 is for heating and melting the surface of the separation membrane to improve the adhesion of the separation membrane. The inner surface of the separation membrane 20 which is in close contact with the electrode 10 And a first heating roller 311a which is supported on the left side of the separator 20 and on which a heating unit 311a-1 for directly heating the inner surface of the separator 20 is formed.

That is, the first heating unit 311 conveys the separation membrane 20 while the first heating roller 311a supports the inner surface of the separation membrane 20. At this time, the heating unit 311a-1 And heats the inner surface of the separation membrane 20 supported by the first heating roller 311a by heat dissipated.

The first heating unit 311 having such a configuration includes the first heating roller 311a provided with the heating unit 311a-1, and the first heating roller 311a having the heating unit 311a- Can be continuously heated. As a result, the inner surface of the separation membrane 20 can be stably melted, and the adhesion force can be increased.

The heating unit 311a-1 may be formed on the entire outer circumferential surface of the first heating roller 311a so that the entire inner surface of the separation membrane 20 supported by the first heating roller 311a may be stably So that the bonding layer 30 in which the electrode 10 and the entire adhered surface of the separation membrane 20 are bonded can be formed as shown in Fig.

The heating unit 311a-1 may be formed as a heat ray or a hot plate that dissipates heat when power is applied. Accordingly, the inner surface of the separation layer 20 supported by the first heating roller 311a can be stably It can be heated.

Here, the temperature of the heating unit 311a-1 is 40 占 폚 to 80 占 폚. That is, when the temperature of the heating unit 311a-1 is 40 ° C or lower, it is difficult to melt the inner surface of the separation membrane, and thus the adhesion force can not be improved. If the temperature of the heating part 311a-1 is 80 ° C or higher, the inner surface of the separation membrane is greatly melted and the adhesion can be improved, but deformation may occur.

Accordingly, the temperature of the heating unit 311a-1 is 40 ° C to 80 ° C, and the inner surface of the separation membrane can be stably heated to increase the adhesion.

The first pressurizing roller 312 serves to align and simultaneously bond the heated separating film with the supplied electrode. The separating film 20 passing through the first heating unit 311 and the electrode supplying device 100 (Or rolled) the electrode 10 supplied by the electrode 10 and joining the heated separator 20 and the electrode 10 together. That is, the plurality of electrodes 10 supplied by the electrode supplying apparatus 100 are sequentially joined to the inner surface of the separator 20 and joined together, thereby keeping the interval deviation of the plurality of electrodes constant have.

The first pressure roller 312 presses the outer surface of the separation membrane 20 (the right side of the separation membrane as viewed in FIG. 3) which has not been preheated by the first heating roller 311a, It is possible to prevent the weakening of the bonding force of the inner surface of the separation membrane 20 preheated by the roller 311a.

The first pressure roller 312 may be formed as a pair so as to simultaneously press the upper surface and the lower surface of the laminated electrode 10 and the separation membrane 20.

The first pressing roller 312 having such a configuration presses the electrode 10 continuously fed by the heated separating film 20 and the electrode feeding device 100 which have passed through the first heating portion 311 So that it is possible to prevent the tilting of the electrodes sequentially aligned with the separator 20 and to keep the intervals between the electrodes constant.

The first heating unit 311 includes a second heating roller 311b having a heating unit 311b-1 for heating and heating the inner surface of the separation membrane 20 wound around the first pressure roller 312, ).

That is, the temperature of the heated separation membrane 20 is lowered while being transferred to the first pressure roller 312, so that the bonding force of the inner surface of the separation membrane 20 may be deteriorated. In order to prevent this, the separation membrane 20 is reheated through the second heating roller 311b to increase the bonding force just before the separation membrane and the electrode are aligned, thereby increasing the bonding strength between the separation membrane 20 and the electrode 10 have.

In particular, the second heating roller 311b presses the inner surface of the separation membrane 20 wound around the first pressure roller 312, thereby keeping the tension of the separation membrane 20 constant.

The process of joining and joining the electrode and the separator by the joining device having the above-described structure will be described in more detail as follows.

3, the electrode 10 is supplied in a third direction (from left to right as viewed in FIG. 3), and the separation membrane 20 is arranged in a first direction The upper surface of the electrode 10 and the lower surface thereof). The first heating roller 311a guides the separation membrane 20 moving in the first direction to move in a second direction (right-to-left direction in FIG. 3) At the same time, the inner surface of the separation membrane 20 is heated through the heating unit 311a-1. The second heating roller 311b is spaced apart from the first heating roller 311a with respect to the second direction so that the separation layer 20 passing through the first heating roller 311a is moved in the second direction At the same time, the inner surface of the separation membrane 20 is reheated through the heating unit 311b-1. The first pressing roller 312 guides the separation membrane 20 moving in the second direction to move in a third direction which is turned 180 degrees in the second direction, (20) and the electrode (10) are pressed together and bonded together at the same time.

On the other hand, the first heating roller 311a and the second heating roller 311b heat the inner surface of the separation membrane 20 at the same temperature. That is, the first heating roller 311a and the second heating roller 311b heat the inner surface of the separation membrane 20 to the same temperature until the electrode 10 and the separation membrane 20 are aligned, 20 can maintain a constant temperature until the inner surface thereof is joined to the electrode 10, and thus the bonding force between the electrode and the separation membrane can be maintained uniformly, and as a result, the quality can be improved.

On the other hand, the first heating roller 311a and the second heating roller 311b may have the same height when viewed from the direction in which the electrode 10 is conveyed.

The alignment device 300 includes a matching electrode 10 and a transfer member 320 for transferring the separation membrane 20 to the laminator 300. The electrode 10 And the separation membrane 20 can be stably transported.

The feeding member 320 may be provided as a feeding belt. The feeding belt 320 is transported in a state where the electrode 10 and the separating film 20 are press-fit, It is possible to more reliably transport the recording medium 20.

The second heating roller 311b and the first pressure roller 312 may have the same diameter so that the second heating roller 311b and the first pressure roller 312 are separated from the surface of the separation membrane The separation membrane 20 can be prevented from being bent in a direction in which the pressure is weak.

When the electrode 10 and the separator 20 are joined to each other, the electrode 10 and the separator 20 are aligned with each other while the electrode 10 is aligned with the separator 20, As a result, the interval between the electrodes sequentially matched to the separation membrane 20 can be kept constant.

Laminator

The laminator 400 includes a second heating unit 410 for applying heat to the primary bonded electrode 10 and the separation membrane 20 transferred by the transfer member 312 to preheat the secondary electrode, And a second pressure roller 420 for pressurizing and laminating the primary bonded electrode 10 preheated by the unit 410 and the separator 20. [

The laminator 400 having the above-described structure preheats the first electrode 10 and the separator 20 through the second heating unit 410 to increase the adhesive force, and the second pressure roller 420 The primary bonded electrode 10 and the separating film 20 can be bonded to each other by the second pressing.

Therefore, in the lamination apparatus for a secondary battery according to the first embodiment of the present invention, the electrodes and the separator are aligned with each other through the alignment device 300 and the primary bonding is performed to prevent the electrode from tilting, and the laminator 400 The secondary bonding of the secondary electrode and the secondary membrane can increase the bonding force between the electrode and the secondary membrane.

Hereinafter, a lamination method of a lamination apparatus for a secondary battery according to a first embodiment of the present invention will be described.

[Lamination method for secondary battery according to the first embodiment]

As shown in FIG. 5, the lamination method for a secondary battery according to the first embodiment of the present invention includes a supplying step S10 for supplying an electrode 10 and a separating film 20, (20), and the primary bonded electrode (20) conveyed by the coalescing and transferring step (S20), and the primary bonded electrode 10 and the separator 20 and laminating the laminate 20 (S30).

The supplying step S10 is for supplying the electrode 10 and the separating film 20 and supplies the electrode 10 through the electrode supplying device 100 and supplying the separating film through the separating film supplying device 200 .

At this time, the separation membrane feeder 100 may be provided in pairs so that the separation membrane 20 is supplied to both surfaces of the electrode 10.

The aligning and transferring step S20 is a step of aligning the electrode 10 and the separator 20 supplied by the supplying step S10 and simultaneously performing a primary bonding to prevent tilting of the electrode 10 (S21), and a second step (S22) of transferring the electrode 10 and the separation membrane 20 which are primarily bonded together. At this time, the merging and transferring step (S20) uses the merging device (300).

That is, in the first step S21, the inner surface of the separation membrane 20 supplied by the supply step S10 is heated by the first heating unit 311a to improve the adhesive force, and the first pressure roller 312 The electrode 10 supplied by the supplying step S10 and the separating film 20 having improved adhesion are pressed and joined together at the same time.

The first heating portion 311a includes the first and second heating rollers 311a-1 and 311a-2 to continuously heat the separation membrane 10, And can be stably supported and heated.

In the second step S22, the primary bonded electrode 10 and the separator 20 are transferred through the transfer member 320. [ At this time, since the electrode 10 and the separator 20 are bonded to each other, the tilting of the electrode 10 can be prevented. As a result, the gap between the electrodes sequentially bonded to the separator 20 is maintained constant, .

In the lamination step (S30), the primary bonded electrode and the separator are thermally bonded to each other by secondary bonding. At this time, the laminator 400 is used.

That is, in the lamination step S30, heat is applied to the primary bonded electrode and the separation membrane through the second heating unit 410, thereby improving the adhesion between the primary bonded electrode and the separation membrane. Then, the first electrode and the separator are pressurized by the second heating roller 420 to be secondarily bonded to each other, so that the contact surface of the electrode and the separator can be perfectly coupled.

Hereinafter, in describing another embodiment of the present invention, the same reference numerals are used for the same components as those of the above-described embodiment, and redundant explanations are omitted.

[Second In the embodiment  For secondary batteries Lamination  Device]

6, the lamination apparatus for a secondary battery according to the second embodiment of the present invention includes an aligning device 300 having a aligning member 310 and a conveying member 320, 310 includes a first heating portion 311 and a first pressure roller 312.

The first heating unit 311 includes a first heating roller 311a and a second heating roller 311b and the first heating roller 311a and the second heating roller 311b are provided with an inner surface And heating sections 311a-1 and 311b-1 for heating.

The heating units 311a-1 and 311b-1 are formed on a part of the main surfaces of the first heating roller 311a and the second heating roller 311b, and only a part of the inner surface of the separation membrane 20 is heated So that only a part of the contact surface between the separator 20 and the electrode 10 heated by the heating parts 311a-1 and 311b-1 can be bonded.

For example, as shown in FIG. 6, the heating units 311a-1 and 311b-1 are provided at the center of the first heating roller 311a and the second heating roller 311b, The electrode 10 and the separator 20 are heated as shown in Figure 7 by heating the center of the inner surface of the separator 10 passing through the first heating roller 311a and the second heating roller 311b, The bonding layer 30 can be formed at the center of the contact surface.

The heating units 311a-1 and 311b-1 may be patterned on the main surfaces of the first heating roller 311a and the second heating roller 311b, And the separator 20 may be pattern-bonded.

On the other hand, the widths of the heating units 311a-1 and 311b-1 are 1 to 10 cm. That is, when the width of the heating units 311a-1 and 311b-1 is 1-10 cm or less, the electrode and the separation membrane can not be stably bonded, resulting in failure. When the width of the heating units 311a-1 and 311b-1 is 10 cm or more, the electrode and the separation membrane can be stably bonded. However, since the heating unit is often applied to prevent tilting of the electrode, have.

[Third In the embodiment  For secondary batteries Lamination  Device]

A lamination apparatus for a secondary battery according to a third embodiment of the present invention includes an electrode supplying device 100, a separating film supplying device 200 for supplying a separating film 20 to both sides of the electrode 10, A combining member 310 for matching the electrode 10 supplied by the separator feeder 200 and the separator 20 supplied by the separator feeder 200 and for preventing the tilting by primary bonding, A joining device 300 having a primary bonded electrode 10 and a transfer member 320 for transferring the separation film 20 and a primary bonded electrode 10 transferred by the transfer member 320, And a laminator 400 for completing the laminated secondary battery by secondary bonding the separator 20 to the secondary battery.

In the laminated secondary battery completed by the laminator 400, both surfaces of the electrode are covered with a separator, and the separator is bonded by a fusion bonding portion provided with a gap around the electrode and fused, and the inner peripheral portion of the fusion- And a fusion-bonding portion which is continuously fused between the outer peripheral portion and the adjacent fusion bonding portion is provided so that the inside and the outside of the separation membrane containing the electrode are sealed so as not to communicate with each other.

That is, in the lamination secondary battery according to the third embodiment of the present invention, the anode electrode and the cathode electrode completed by the laminator 400 are laminated via a separator, and the anode electrode and the cathode electrode are formed as a separator And the periphery of the positive electrode and the negative electrode is intermittently fused to form a fused joint, the fusion-sealed portion is provided so that the active material peeled off from the positive electrode or the negative electrode between the fused joint portions intermittently provided in the envelope- .

Hereinafter, a laminated secondary battery manufactured through a lamination apparatus for a secondary battery according to a third embodiment of the present invention will be described in detail.

8, the laminate-type secondary battery includes a battery element 1 in which the anode electrode 2 and the cathode electrode 3 are sealed by a separator 4, And is made up of electrodes covered with a mold.

The separation membrane 4 covering the anode electrode 2 is fusion bonded at the fusion bonding portion 6 where the anode electrode 2 is fused by providing a gap around the anode electrode 2 and is made into an envelope. As described above, the cathode electrode 3 is also covered by the separating film and is bonded by the fusion bonding portion 6. A fusion sealing portion 7 is formed on the outer side of the fusion splice portion 6 so as to be in contact with each of the adjacent fusion splice portions 6 to connect them.

The separation membrane 4 is fused and bonded at the fusion bonding portion 6 to form a bag body supporting the anode electrode 2 therein. In addition, the fusion sealing portion 7 is formed so as to be in contact with the adjacent fusion bonding portions 6, and the space between the fusion bonding portions 6 is sealed. Therefore, even when the cathode active material is peeled off from the anode electrode, Is prevented from flowing out to the outside in the space between the fusion splice portions (6).

That is, by providing the fused joint portion intermittently as in the present invention, the laminate separation does not occur well when the anode electrode and the cathode electrode are laminated, and the wrinkle of the separation membrane is not generated well, .

In addition, by providing a fusion-sealed portion inside and outside of the envelope type separator, it is possible to suppress the self-discharge caused by the adhesion of the active material peeled from the battery electrode to the opposite electrode side.

Further, in the laminated secondary battery of the present invention, when the intermittent fusion splice is provided in the separation membrane, the separation membrane shrinks due to fusion, but since the fusion splice is formed intermittently, the shrinkage of the separation membrane is relaxed, The fusing property of the separation membrane is enhanced as compared with the case where the entire end portion is thermally fused. As a result, even when the battery temperature rises, a short circuit with the opposite electrode due to shrinkage of the separator can be prevented.

In the above description, examples in which both the positive electrode and the negative electrode are covered with the envelope-type separator have been described, but either the positive electrode or the negative electrode may be covered.

9 (A), the separating film 4 is intermittently bonded at the outer peripheral portion of the anode electrode 2 to provide the fused joint portion 6. In this case, as shown in Fig. A fusion sealing portion 7 is intermittently provided on the outer peripheral portion of the fusion bonding portion 6 in contact with the adjacent fusion bonding portion 6. A fusion bonding sealing portion is provided in the outer peripheral portion of the region between the fusion bonding portions 6 intermittently provided have.

Therefore, since the region between the fused joint portions 6 provided intermittently is bonded by the fusion sealing portion, the active material peeled off from the anode electrode can be prevented from flowing out to the outside of the separation film.

9 (B) shows a state in which the separation membrane 4 is intermittently bonded at the outer peripheral portion of the anode electrode 2 to provide a fusion bonding portion 6. Fig. And a continuous fusion sealing portion 7 is provided on the outer peripheral portion of the fusion bonding portion 6 in contact with the fusion bonding portion 6. [ It is preferable that the fusion sealing portion 7 is provided in contact with the fusion bonding portion 6. [ As a result, it is possible to prevent the formation of a space in which the cathode active material peeled off from the anode electrode is retained between the outer fusion sealing portions of the fusion splice.

9 (C) shows a state in which the separating film 4 is intermittently bonded at the outer peripheral portion of the anode electrode 2 to provide a fusion bonding portion 6. And a continuous fusion sealing portion 7 is provided in the inner peripheral portion of the fusion bonding portion 6 in contact with the fusion bonding portion 6. [

In the battery electrode as described above, it is necessary to bond the separation membrane 4 located on both sides of the anode electrode 2 with sufficient strength in the intermittent fusion splice portion 6, and therefore, when forming the fusion splice portion 6, It is necessary to form a fused portion by applying a sufficient temperature and pressure to dissolve and bond.

On the other hand, since the fusion sealing portion prevents leakage of the cathode active material peeled off from the anode electrode to the outside of the separating film between the fusion splicing portions provided intermittently, it is not necessary to have a bonding force of about the fusion splicing portion, The welding strength of the portion can be made not to exceed the strength of the welding joint portion.

The fusion sealing portion is not provided in a portion where the anode electrode or the cathode electrode is likely to be in direct contact with the fusion bonding portion as in the inside of the fusion bonding portion because the bonding strength is smaller than that of the fusion bonding portion. .

10 is a view for explaining a method of manufacturing a laminated secondary battery of the present invention.

As shown in Fig. 10 (A), the anode electrode 2 is arranged with a predetermined gap between the strip-shaped separators 4.

10 (B), the lamination 400 forms a fusion bonding portion 6 by providing a gap around the anode electrode 2 of the separation membrane 4 with a gap therebetween.

Fusing by the lamination 400 can be performed by any fusing means such as heat fusion, ultrasonic fusion, high frequency fusing by closely contacting heated fusing means.

10 (C), the lamination 400 is an outer peripheral portion of the fusion bonding portion 6, and the fusion bonding portion 7 is formed so as to contact the fusion bonding portions adjacent to each other between the adjacent fusion bonding portions 6, .

On the other hand, as shown in Fig. 10 (D), it is possible to cut along the cutting line 8, and the cutting line 8 may be provided in the fusion sealing portion 7. [

It is also preferable to cool the separator between the fused joint forming step and the fused seal forming step, or between the fused seal forming step and the cutting step. By thus cooling the separation membrane between processes, thermal deformation of the separation membrane can be reduced.

In the above description, the two separator films are arranged above and below the electrodes of the battery to form an envelope. However, even if one separator film is bent at the center and both surfaces of the electrode are covered with each other, As shown in FIG.

The laminated secondary battery of the present invention can be applied to various kinds of batteries, but a lithium ion battery will be described below.

The positive electrode active material may be a metal such as lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, transition metal lithium composite oxide of lithium cobalt nickel oxide, lithium titanium sulfide, lithium molybdenum sulfide, lithium selenide niobium, Organic compounds such as chalcogenide, polypyrrole, polythiophene, polyaniline, polyacene compounds, polyacetylene, polyallylene vinylene, dithiol derivatives and disulfide derivatives, and mixtures thereof.

As the collector of the positive electrode, a metal such as aluminum or an alloy thereof or titanium may be used.

Further, a carbon-based material such as graphite or amorphous carbon capable of being doped or undoped with lithium ions, a tin-based complex oxide, or the like can be used for the cathode. Copper, nickel alloy and the like can be used for the negative electrode current collector. The separator for covering the positive electrode or the negative electrode of the present invention may be a film of porous polyethylene, polypropylene or the like.

Further, in the laminated secondary battery of the present invention, the anode electrode coated with the envelope-type separator fabricated as described above, or the cathode electrode can be sealed in the battery can made of metal or covered with a flexible material, .

The laminating apparatus for a secondary battery according to the third embodiment of the present invention includes a laminator 400 for laminating the anode electrode and the separator or the cathode electrode and the separator through the aligning apparatus 300, So that the tilting or flow of the anode electrode or the cathode electrode coated on the separator can be prevented, and as a result, the defect rate can be greatly reduced.

That is, the confluence device 300 aligns the electrode (anode electrode or cathode electrode) supplied by the electrode supply device with the separation membrane supplied by the separation membrane supply device and simultaneously performs primary bonding to prevent tilting And a transferring member for transferring the primary bonded electrode and the separating film.

The combining member 310 includes a first heating unit 311 for heating the separation membrane supplied by the separation membrane feeder, a separator 311 heated by the first heating unit 311, And a first pressing roller 312 for firstly joining and coinciding the supplied electrodes. The scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and both the meaning and scope of the claims, Various embodiments derived from the equivalence concept are possible.

100: electrode feeding device
200: Membrane feeder
300: coalescing device
310:
311: first heating portion
312: first pressure roller
320:
400: Laminator
410: second heating portion
420: second pressure roller

Claims (16)

An electrode supply device for supplying an electrode;
A separation membrane feeder for feeding the separation membrane;
A combining member for matching the electrode supplied by the electrode supplying device and the separating film supplied by the separating film supplying device and for preventing the tilting by primary bonding to each other, A joining device having a conveying member; And
And a laminator for secondary bonding and lamination the separating film and the primary bonded electrode transferred by the transferring member. The method according to claim 1,
Wherein the combining member includes a first heating unit for heating the separation membrane supplied by the separation membrane feeding device and an electrode supplied by the electrode feeding device together with the separation membrane heated by the first heating unit, And a first pressing roller that carries the first and second pressing rollers. The method of claim 2,
Wherein the first heating unit includes a first heating roller supported on an inner surface of the separation membrane that is in close contact with the electrode and has a heating unit for heating the inner surface of the separation membrane. The method of claim 3,
Wherein the first pressing roller presses the outer surface of the separation membrane that has not been preheated by the first heating roller. The method of claim 3,
Wherein the first heating unit further comprises a second heating roller having a heating unit for heating and heating the inner surface of the separation membrane wound around the first pressure roller. The method of claim 5,
The first heating roller guides the separation membrane moving in the first direction to move in the second direction which is turned by 90 degrees in the first direction,
Wherein the second heating roller is spaced from the first heating roller with respect to the second direction,
Wherein the first pressing roller guides the separation membrane moving in the second direction to move in a third direction which is turned 180 degrees in the second direction. The method of claim 5,
Wherein the first heating roller and the second heating roller heat the inner surface of the separation membrane at the same temperature. The method of claim 5,
Wherein the heating unit is formed on the entire main surface of the first heating roller and the second heating roller so as to heat the entire inner surface of the separating film so that the entire adhered surface of the separating film and the electrode is bonded. The method of claim 5,
Wherein the heating unit is formed on a part of the main surface of the first heating roller and the second heating roller to heat only a part of the inner surface of the separation film so that only a part of the contact surface between the separation membrane and the electrode is bonded, Device. The method according to claim 1,
Wherein the feeding member is provided as a feeding belt. The method according to claim 1,
The laminator further includes a second heating unit for preheating the primary bonding electrode and the separation membrane transferred by the transfer member by applying heat to the separation membrane and a second heating unit for preheating the primary bonding electrode and the separation membrane preheated by the second heating unit, And a second pressing roller that laminates the second pressing roller. A supply step (S10) of supplying an electrode and a separation membrane;
A first step of joining the electrode supplied by the supplying step and the separation membrane and simultaneously performing a primary bonding to prevent tilting and a second step of transferring the primary bonded electrode and the separation membrane, Step S20; And
And a lamination step (S30) for secondary bonding and lamination of the primary bonded electrode and the separator transferred by the coalescing and transferring step. The method of claim 12,
Wherein the first step comprises preheating the separator supplied by the supplying step and aligning the electrodes supplied by the supplying step with the preheated separator and simultaneously performing the first laminating. The method of claim 12,
Wherein the first step is performed by applying heat to the inner surface of the separator which is in close contact with the electrode, thereby preheating the laminate. An electrode supply device for supplying an electrode;
A separation membrane supplying device for supplying a separation membrane to cover both sides of the electrode;
A combining member for matching the electrode supplied by the electrode supplying device and the separating film supplied by the separating film supplying device and for preventing the tilting by primary bonding to each other, A joining device having a conveying member; And
And a laminator for completing a laminated secondary battery by secondary bonding the separator to the primary bonded electrode carried by the transfer member,
The laminated secondary battery is characterized in that the electrode is covered with a separator on both sides of the electrode, and the separator is joined by a fusion bonding portion provided with a gap around the electrode, and the inner peripheral portion, the outer peripheral portion or the adjacent fusion bonding portion And the separator containing the electrode is sealed. The lamination apparatus for a secondary battery according to claim 1, 16. The method of claim 15,
Wherein the combining member includes a first heating unit for heating the separation membrane supplied by the separation membrane feeding device and an electrode supplied by the electrode feeding device together with the separation membrane heated by the first heating unit, And a first pressing roller that carries the first and second pressing rollers.

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