KR102442472B1 - Lamination apparatus and method for secondary battery - Google Patents

Abstract

The present invention relates to a lamination device for a secondary battery, comprising: an electrode supply device for supplying electrodes; a separation membrane supply device for supplying a separation membrane; A matching member for preventing tilting by first bonding the electrode supplied by the electrode supply device and the separator supplied by the separator supply device to coincide with each other, and transferring the primary bonded electrode and the separator a matching device having a transfer member; and a laminator for laminating a secondary bonding between the primary bonded electrode and the separator transferred by the conveying member.

Description

Lamination apparatus and method for secondary battery

The present invention relates to a lamination apparatus and method for a secondary battery, and more particularly, to a lamination apparatus and method for a secondary battery in which the matching force between an electrode and a separator is increased.

In general, a secondary battery means a battery that can be charged and discharged, unlike a primary battery that cannot be charged, and is widely used in electronic devices such as mobile phones, notebook computers, camcorders, etc. or electric vehicles.

Such a secondary battery includes an electrode assembly having an electrode tab, an electrode lead coupled to the electrode tab, and a case for accommodating the electrode assembly in a state in which the tip of the electrode lead is withdrawn to the outside, wherein the electrode assembly is an electrode It is formed of a basic unit in which and a separation membrane are alternately stacked, or a unit stack in which a plurality of the basic units are stacked.

Here, the electrode assembly performs a lamination process to increase bonding strength, and the lamination process includes a step of cutting an electrode, a matching step of placing the cut electrode on a separator to mate and then transporting, and heating the matched electrode and the separator It includes a lamination step for bonding.

However, in the lamination process, there was a problem in that the electrode tilted in the process of matching the cut electrode and the separator, and accordingly, the gap between the electrodes mounted on the separator was irregularly generated, and a defective electrode assembly was manufactured. There was a problem being

Patent Publication No. 10-2016-0040087

The present invention was invented to solve the above problems, and an object of the present invention is to prevent tilting of the electrode by adhering the electrode and the separator in the process of matching the electrode and the separator, An object of the present invention is to provide a lamination apparatus and method for a secondary battery that can maintain a constant deviation of the spacing between the electrodes, and as a result, can prevent a defective electrode assembly from being manufactured.

A lamination device for a secondary battery according to an embodiment of the present invention for achieving the above object includes an electrode supply device for supplying an electrode; a separation membrane supply device for supplying a separation membrane; A matching member for preventing tilting by first bonding the electrode supplied by the electrode supply device and the separator supplied by the separator supply device to coincide with each other, and transferring the primary bonded electrode and the separator a matching device having a transfer member; and a laminator for laminating the primary bonded electrode and the separator transferred by the transfer member by secondary bonding.

The matching member includes a first heating part for heating the separator supplied by the separator supply device, and at the same time matching the separator heated by the first heating part and the electrode supplied by the electrode supply device 1 It may include a first pressure roller for car bonding.

The first heating unit may include a first heating roller supported on an inner surface of the separator in close contact with the electrode and provided with a heating part for heating the inner surface of the separator.

The first pressure roller may press the outer surface of the separation membrane that is not preheated by the first heating roller.

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

The first heating roller guides the separation membrane traveling in a first direction to move in a second direction changed by 90 degrees from the first direction, and the second heating roller moves in the second direction from the first heating roller is installed to be spaced apart from each other, and the first pressure roller may guide the separation membrane moving in the second direction to move in a third direction changed 180 degrees from the second direction.

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

The heating unit may heat the entire inner surface of the separator while being formed on the entire main surface of the first heating roller and the second heating roller so that the entire contact surface of the separator and the electrode is bonded.

The heating unit may be formed on a portion of the main surfaces of the first heating roller and the second heating roller to heat only a portion of the inner surface of the separation film so that only a portion of the adhesion surface of the separator and the electrode is bonded.

The transfer member may be provided as a feeding belt.

The laminator includes a second heating unit for preheating by applying heat to the primary bonded electrode and the separator transferred by the transfer member, and the primary bonded electrode and the separator preheated by the second heating unit, pressurizing the separator It may include a second pressure roller for lamination.

On the other hand, the lamination method for a secondary battery according to an embodiment of the present invention is a supply step (S10) of supplying an electrode and a separator; Matching and transferring provided in a first process of preventing tilting by first joining the electrode and the separator supplied by the supplying step and at the same time, and a second process of transferring the first bonded electrode and the separator step (S20); A lamination step (S30) of laminating the primary bonded electrode and the separator transferred by the matching and transporting step may be included in the secondary bonding step (S30).

In the first process, the separator supplied by the supplying step may be preheated, and the preheated separator and the electrode supplied by the supplying may be matched and first bonded at the same time.

The first process may be preheated by applying heat to the inner surface of the separator in close contact with the electrode.

On the other hand, the lamination device for a secondary battery according to another embodiment of the present invention is an electrode supply device for supplying an electrode; a separator supplying device for supplying a separator so that both surfaces of the electrode are covered; A matching member for preventing tilting by first bonding the electrode supplied by the electrode supply device and the separator supplied by the separator supply device to coincide with each other, and transferring the primary bonded electrode and the separator a matching device having a transfer member; and a laminator for completing a laminated secondary battery by secondary bonding the primary bonded electrode and the separator transferred by the transfer member, wherein the laminated secondary battery completed by the laminator has both sides of the electrode as a separator At the same time as being covered, the separator is joined by a fusion spliced portion fused by providing a gap around the electrode, and a fusion spliced portion continuously fused between the inner periphery and outer periphery of the fusion spliced portion or adjacent fusion spliced portions is provided to accommodate the electrode The separator may be sealed.

The present invention has the following effects.

First: The lamination device for a secondary battery of the present invention is characterized in that it includes a matching device provided with a matching member, and due to such a feature, the supplied electrode and the separator can be matched and the primary bonding can be performed at the same time, and thus the separator It is possible to prevent the tilting of the electrodes mounted on the electrode to maintain a constant distance deviation between the electrodes, and as a result, it is possible to prevent a defective electrode assembly from being manufactured.

Second: in the lamination device for a secondary battery of the present invention, the matching member includes a first heating part for heating the separator, and a first pressure roller for matching and primary bonding the heated separator and the supplied electrode at the same time and due to these characteristics, the separator and the electrode can be stably matched and bonded at the same time. In particular, as the separator is heated before mating, the separator and the electrode can be bonded more stably, and as a result, tilting of the electrode mounted on the separator can be largely prevented.

Third: In the lamination device for a secondary battery of the present invention, the first heating part has a feature of including a first heating roller that supports and simultaneously heats the inner surface of the separator in close contact with the electrode, and due to such a feature, the surface of the separator is stabilized In particular, by heating the inner surface of the separator adhered to the electrode, the bonding strength between the electrode and the separator can be greatly increased. On the other hand, the first heating roller transfers the separation membrane through rotational force, thereby increasing the transfer force of the separation membrane.

Fourth: In the lamination device for a secondary battery of the present invention, the first pressure roller has a feature of pressing the outer surface of the separator that is not preheated by the first heating roller, and due to this feature, the bonding strength of the inner surface of the separator is weakened. can

Fifth: In the lamination device for a secondary battery of the present invention, the first heating part has a feature that it includes a second heating roller that presses and simultaneously heats the inner surface of the separator wound on the first pressure roller, and due to such a feature, the separator By heating the separator again while controlling the tension of the separator, the adhesive force can be increased, thereby greatly improving the adhesion between the electrode and the separator.

Sixth: In the lamination device for a secondary battery of the present invention, the first and second heating rollers heat the inner surface of the separator at the same temperature, and due to this feature, the inner surface of the separator maintains a constant temperature until bonding with the electrode. can be maintained, and thus 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 a main surface, and the heating unit is formed on all or part of the main surface of the first and second heating rollers. Due to the characteristics, the entire inner surface of the separator may be heated to bond the entire adhesion surface of the electrode and the separator, or part of the inner surface of the separator may be heated to bond only a portion of the adhesion surface between the electrode and the separator. Accordingly, the adhesion area between the electrode and the separator can be adjusted according to the applied product.

Eighth: In the lamination device for a secondary battery of the present invention, the matching device includes a transport member, wherein the transport member is provided with a fitting belt, and due to such a feature, the mating electrode and the separator can be transported more stably have.

Ninth: The lamination apparatus for a secondary battery of the present invention includes a laminator for thermally bonding a mating electrode and a separator, wherein the laminator includes a second heating unit for secondly preheating the mating electrode and the separator, and the secondly preheated electrode and separator It is characterized in that it includes a second pressure roller for laminating by pressing, and due to such a feature, it is possible to perfectly bond the contact surface of the electrode and the separator.

1 is a front view schematically showing a lamination apparatus for a secondary battery according to a first embodiment of the present invention.
Figure 2 is a perspective view showing a matching device of the lamination device for a secondary battery according to the first embodiment of the present invention.
Figure 3 is a perspective view showing a matching member of the matching device shown in Figure 2;
4 is a cross-sectional view taken along line AA shown in FIG.
5 is a flowchart illustrating a lamination method for a secondary battery according to a first embodiment of the present invention.
6 is a perspective view illustrating a matching device of a lamination device for a secondary battery according to a second embodiment of the present invention.
7 is a cross-sectional view taken along line BB shown in FIG.
8 is a perspective view illustrating a stacked secondary battery manufactured through a lamination device for secondary batteries according to a third embodiment of the present invention;
9 is a plan view showing an electrode coated with a separator;
10 is a plan view illustrating a method for manufacturing a stacked type secondary battery.

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

[1st in the example for secondary batteries lamination Device]

The lamination device 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 in the process of thermally bonding the electrode and the separator.

For example, in the lamination device for a secondary battery according to the first embodiment of the present invention, as shown in FIG. 1 , an electrode supply device 100 for supplying the electrode 10 , and a separator supply for supplying the separator 20 . Device 200, a matching device 300 for aligning and primary bonding the electrode 10 supplied by the electrode supply device 100 and the separator 20 supplied by the separator supply device 200 at the same time and a laminator 400 for secondarily bonding the electrode 10 and the separator 20 matched by the matching device 300 .

electrode supply

The electrode supply device 100 is for supplying electrodes, and includes an electrode winding roller for supplying a wound electrode sheet, a driving motor for rotating the winding roller so that the electrode sheet wound on the winding roller is supplied, and the winding It includes a cutter 110 for cutting the electrode sheet supplied from the roller to a predetermined size. Meanwhile, the electrode may be an anode or a cathode.

Membrane supply device

The separation membrane supply device 200 is for supplying the separation membrane, and a separation membrane winding roller for supplying the wound separation membrane 20, and the separation membrane winding roller to rotate the separation membrane winding roller so that the separation membrane 20 wound to the separation membrane winding roller is supplied. including a drive motor.

Here, the separator supply apparatus 200 is provided on the upper surface and the lower surface, respectively, based on the electrode 10 supplied from the electrode supply apparatus 100, with reference to FIG. 1 , and accordingly, the upper surface and the lower surface of the electrode 10 The separation membranes 20 are supplied so that the separation membranes 20 are stacked, respectively.

matching device

As shown in FIGS. 2 and 3 , the matching device 300 is for matching the electrode and the separator and for primary bonding at the same time, and includes the electrode 10 supplied by the electrode supply device 100 and and a matching member 310 for preventing tilting of the electrode 10 by first bonding and matching the separator 20 supplied by the separator supply device 200 .

The matching member 310 includes a first heating unit 311 for heating the separation membrane 20 supplied by the separation membrane supply device 200 , and a separation membrane 20 heated by the first heating unit 311 . ) and a first pressure roller 312 for primary bonding and at the same time matching the electrode 10 supplied by the electrode supply device 100 .

The first heating part 311 is to heat and melt the surface of the separator to improve adhesion of the separator, and the inner surface of the separator 20 that is in close contact with the electrode 10 (as seen in FIG. 3 , of the separator and a first heating roller 311a supported on the left side) and provided with a heating unit 311a-1 that directly heats the inner surface of the separation membrane 20 .

That is, the first heating unit 311 transports the separation membrane 20 while the first heating roller 311a supports the inner surface of the separation membrane 20, and at this time, from the heating unit 311a-1 The inner surface of the separation membrane 20 supported by the first heating roller 311a is heated by the heat emitted.

The first heating unit 311 having such a configuration includes the first heating roller 311a provided with the heating unit 311a-1, and thus the separation membrane 20 passing through the first heating roller 311a. ) can be continuously heated, and as a result, the inner surface of the separator 20 can be stably melted to increase the adhesive force.

Meanwhile, the heating unit 311a-1 may be formed on the entire outer circumferential surface of the first heating roller 311a, thereby stably stabilizing the entire inner surface of the separation membrane 20 supported by the first heating roller 311a. can be heated, and thus, as shown in FIG. 4 , a bonding layer 30 in which the entire adhesion surface of the electrode 10 and the separator 20 is bonded can be formed.

On the other hand, the heating unit 311a-1 may be formed of a hot wire or a hot plate that radiates heat when power is applied, and accordingly, the inner surface of the separation membrane 20 supported by the first heating roller 311a is stably and directly can be heated.

Here, the temperature of the heating unit 311a-1 is 40°C to 80°C. That is, when the temperature of the heating unit 311a-1 is 40° C. or less, it is difficult to melt the inner surface of the separator, and thus the adhesive force cannot be improved. In addition, when the temperature of the heating unit 311a-1 is 80° C. or higher, the inner surface of the separator is largely melted to improve adhesion, but deformation may occur.

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

The first pressure roller 312 is for first bonding the heated separator and the supplied electrode together and at the same time, the separator 20 passing through the first heating part 311 and the electrode supply device 100 ) by pressing (or rolling) the supplied electrode 10, and bonding the heated separator 20 and the electrode 10 together. That is, the plurality of electrodes 10 supplied by the electrode supply device 100 are sequentially matched and bonded to the inner surface of the separator 20 , and accordingly, it is possible to maintain a constant spacing deviation between the plurality of electrodes. have.

Here, the first pressure roller 312 presses the outer surface (the right side of the separation membrane when viewed in FIG. 3) of the separation membrane 20 that is not preheated by the first heating roller 311a, and thus the first heating It is possible to prevent weakening of the bonding force of the inner surface of the separation membrane 20 preheated by the roller 311a.

In addition, the first pressure roller 312 may be formed as a pair to simultaneously press the upper and lower surfaces of the stacked electrode 10 and the separator 20 .

The first pressure roller 312 having such a configuration pressurizes the heated separator 20 passing through the first heating unit 311 and the electrode 10 continuously supplied by the electrode supply device 100 . They can be joined together with the coincidence, and accordingly, tilting of the electrodes that are sequentially matched to the separator 20 can be prevented, and the distance between the electrodes can be kept constant.

On the other hand, the first heating unit 311 is a second heating roller 311b having a heating unit 311b-1 that presses and simultaneously heats the inner surface of the separation membrane 20 wound around the first pressure roller 312 . ) may be further included.

That is, the temperature of the heated separation membrane 20 decreases while being transferred to the first pressure roller 312 , and accordingly, the bonding strength of the inner surface of the separation membrane 20 may be reduced. To prevent this, the separation membrane 20 is reheated through the second heating roller 311b just before the separation membrane and the electrode are combined to increase bonding strength, and thus the bonding strength between the separation membrane 20 and the electrode 10 can be increased. have.

In particular, the second heating roller 311b presses the inner surface of the separation membrane 20 wound around the first pressure roller 312 , and thus the tension of the separation membrane 20 can be constantly maintained.

On the other hand, the process of matching and bonding the electrode and the separator by the matching device having such a configuration will be described in more detail as follows.

As shown in FIG. 3 , the electrode 10 is supplied in a third direction (from left to right when viewed in FIG. 3 ), and the separator 20 is directed toward the electrode 10 in a first direction ( FIG. 3 ). when viewed from the top and bottom surfaces of the electrode 10). And the first heating roller 311a guides the separation membrane 20 moving in the first direction to move in the second direction (from right to left when viewed in FIG. 3 ) in which the direction is changed by 90 degrees from the first direction. At the same time, the inner surface of the separation membrane 20 is heated through the heating unit 311a-1. And the second heating roller (311b) is installed spaced apart from the first heating roller (311a) with respect to the second direction, the separation membrane 20 passing through the first heating roller (311a) in the second direction guide to move, and at the same time reheat the inner surface of the separation membrane 20 through the heating unit 311b-1. And the first pressure roller 312 guides the separation membrane 20 moving in the second direction to move in a third direction changed 180 degrees from the second direction, at this time the separation membrane guided in the third direction (20) and the electrode (10) are pressed while coincident and bonded at the same time.

Meanwhile, 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 separator 20 to the same temperature until the electrode 10 and the separator 20 coincide with each other, and accordingly, the separator ( 20) The inner surface can maintain a constant temperature before bonding to the electrode 10, thereby maintaining uniform bonding force between the electrode and the separator, and as a result, quality can be improved.

Meanwhile, the first heating roller 311a and the second heating roller 311b may have the same height when viewed with respect to the direction in which the electrode 10 is transported.

On the other hand, the matching device 300 includes a transport member 320 for transporting the matched electrode 10 and the separator 20 to the laminator 300 , and the electrode 10 matched through the transport member 320 . ) and the separation membrane 20 can be stably transported.

Here, the conveying member 320 may be provided as a feeding belt, and the feeding belt transports the matched electrode 10 and the separator 20 in a press-fitted state to the matched electrode 10 and the separator. (20) can be transported more stably.

Meanwhile, the second heating roller 311b and the first pressure roller 312 may have the same diameter, and accordingly, the second heating roller 311b and the first pressure roller 312 are formed on the surface of the separation membrane. can be pressurized with the same pressure, and as a result, it is possible to prevent the separation membrane 20 from being bent in a direction in which the pressure is weak.

The matching device 300 having such a configuration matches and transports the supplied electrode 10 and the separator 20 at the same time, but when the electrode 10 and the separator 20 are joined, the electrode 10 is joined. tilting can be prevented, and as a result, it is possible to maintain a constant distance between electrodes sequentially suitable for the separator 20 .

laminator

The laminator 400 includes a second heating unit 410 for preheating by applying heat to the first bonded electrode 10 and the separator 20 transferred by the transfer member 312 , and the second heating and a second pressure roller 420 for pressing and laminating the first bonded electrode 10 and the separator 20 preheated by the unit 410 .

The laminator 400 having such a configuration increases adhesion by preheating the first bonded electrode 10 and the separator 20 through the second heating unit 410, and a second pressure roller 420 through Secondary bonding may be performed by pressing the primary bonded electrode 10 and the separator 20 .

Therefore, in the lamination device for a secondary battery according to the first embodiment of the present invention, the electrode and the separator are matched through the matching device 300 and at the same time the primary bonding is performed to prevent tilting of the electrode, and the laminator 400 can The bonding force between the electrode and the separator can be increased by secondary bonding of the secondary-bonded electrode and the separator.

Hereinafter, a lamination method of the lamination apparatus for a secondary battery according to the 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 is supplied by a supply step (S10) of supplying the electrode 10 and the separator 20, and the supply step (S10). The first bonded electrode transported by the coincident and transfer step (S20), and the coincident and transfer step (S20) for primary bonding and transferring the electrode 10 and the separator 20 at the same time (S20) 10) and a lamination step (S30) of laminating the separator 20 by secondary bonding.

The supply step (S10) is for supplying the electrode 10 and the separator 20. The electrode 10 is supplied through the electrode supply device 100, and the separator is supplied through the separator supply device 200. .

In this case, the separator supply device 100 may be provided as a pair so that the separator 20 is supplied to both surfaces of the electrode 10 .

In the matching and transferring step (S20), the electrode 10 and the separator 20 supplied by the supply step (S10) are matched and at the same time the primary bonding is performed to prevent tilting of the electrode 10 A first process (S21) and a second process (S22) of transferring the primary bonded electrode 10 and the separator 20 are provided. At this time, the matching and transferring step (S20) uses the matching device (300).

That is, in the first process (S21), the inner surface of the separator 20 supplied by the supplying step (S10) is heated with the first heating unit 311a to improve adhesion, and the first pressure roller 312 is used. The separation membrane 20 with improved adhesion and the electrode 10 supplied by the supply step (S10) are pressed to match and bond at the same time.

Here, the first heating unit 311a continuously heats the separation membrane 10 including the first and second heating rollers 311a-1 and 311a-2, and thus the surface of the separation membrane 20 is viewed. It can be stably supported and heated.

In the second process ( S22 ), the first 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, tilting of the electrode 10 can be prevented. can be prevented

In the lamination step (S30), the firstly bonded electrode and the separator are thermally bonded to the second and thus completely combined. 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 separator through the second heating unit 410 to preheat, thereby improving the adhesion between the primary bonded electrode and the separator. Then, the second heating roller 420 pressurizes the firstly bonded electrode and the separator to secondarily bond the electrode, thereby making it possible to perfectly bond the contact surfaces of the electrode and the separator.

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 overlapping descriptions are omitted.

[Second in the example for secondary batteries lamination Device]

As shown in FIG. 6, the lamination apparatus for a secondary battery according to the second embodiment of the present invention includes a matching device 300 having a matching member 310 and a transfer member 320, and the matching member ( 310 includes a first heating unit 311 and a first pressure roller 312 .

The first heating unit 311 includes a first heating roller 311a and a second heating roller 311b, wherein the first heating roller 311a and the second heating roller 311b have an inner surface of the separation membrane and heating units 311a-1 and 311b-1 for heating.

Here, 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 while heating only a part of the inner surface of the separation membrane 20. Accordingly, only a portion heated by the heating units 311a-1 and 311b-1 among the contact surfaces between the separator 20 and the electrode 10 may 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 center of the inner surface of the separation membrane 10 passing through the first heating roller 311a and the second heating roller 311b is heated, and accordingly, as shown in FIG. 7, the electrode 10 and the separation membrane 20 The bonding layer 30 may be formed in the center of the contact surface of the

On the other hand, the heating parts 311a-1 and 311b-1 may be provided to be patterned on the main surfaces of the first heating roller 311a and the second heating roller 311b, and thus the electrode 10 and the separator 20 may be pattern-bonded.

Meanwhile, the width of the heating units 311a-1 and 311b-1 is 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 separator may not be stably bonded to each other, and thus a defect may occur. When the width of the heating parts 311a-1 and 311b-1 is 10 cm or more, the electrode and the separator can be stably bonded, but a large number of heating parts are applied to prevent only the tilting of the electrode, which may result in large cost. have.

[Third in the example for secondary batteries lamination Device]

The lamination device for secondary batteries according to the third embodiment of the present invention includes an electrode supply device 100, a separator supply device 200 for supplying a separator 20 to cover both surfaces of the electrode 10, respectively, and the electrode supply device ( The electrode 10 supplied by 100) and the separator 20 supplied by the separator supply device 200 are matched and the matching member 310 is first bonded to prevent tilting, and the A matching device 300 having a transport member 320 for transporting the primary bonded electrode 10 and the separator 20 , and the primary bonded electrode 10 transported by the transport member 320 ) and a laminator 400 for secondary bonding of the separator 20 to the laminated secondary battery.

Here, in the laminated secondary battery completed by the laminator 400, both sides of the electrode are covered with a separator and at the same time, the separator provides a gap around the electrode and is joined by a fusion spliced portion, the inner periphery of the fusion spliced portion , a fusion-bonded portion continuously fused-sealed between the outer periphery or adjacent fusion-bonded portions is provided so that the inside and the outside of the separator accommodating the electrode do not pass through and is sealed.

That is, the lamination device for a secondary battery according to the third embodiment of the present invention is a stacked secondary battery in which the positive electrode and the negative electrode completed by the laminator 400 are stacked through a separator, and the positive electrode and the negative electrode are used as a separator In the case of forming a fusion junction by intermittently fusion bonding around the positive electrode and negative electrode, a fusion sealing portion is provided to prevent the outflow of the active material peeled from the positive electrode or negative electrode between the fusion junctions provided intermittently in the envelope-type separator. can be prevented

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

As shown in FIG. 8 , the stacked secondary battery includes a battery element 1 , and the battery element 1 encapsulates the positive electrode 2 and the negative electrode 3 by a separator 4 , respectively. It is constituted by electrodes covered with a mold.

The separator 4 covering the anode electrode 2 is formed into an envelope shape by fusion splicing at the fusion splicing portion 6 formed by fusion splicing with a gap around the anode electrode 2 . In this way, the cathode electrode 3 is also covered by the separator and joined by the fusion bonding portion 6 . On the outer side of the fusion-sealed portion 6, a fusion-sealed portion 7 that contacts each of the adjacent fusion-sealed portions 6 and connects them is formed.

The separator 4 is fusion-bonded at the fusion-bonding portion 6 to form a bag upper body supporting the anode electrode 2 inside. Further, since the fusion-sealing portion 7 is formed so as to connect the two in contact with the adjacent fusion-bonded portions 6, and the space between the fusion-bonded portions 6 is sealed, even when the positive electrode active material is peeled from the positive electrode, the peeled positive active material The silver is prevented from flowing out from the space between the fusion spliced portions 6 to the outside.

That is, by intermittently providing the fusion splicing portion as in the present invention, when the positive electrode and the negative electrode are laminated, lamination separation does not occur easily, and wrinkles of the separator do not easily occur, thereby reducing the characteristic degradation of the stacked secondary battery during charging and discharging. can be prevented

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

In addition, in the multilayer secondary battery of the present invention, when an intermittent fusion junction is provided on the separator, the separator shrinks due to fusion, but since the fusion junction is intermittently formed, the contraction of the separator is alleviated and wrinkles are less likely to occur, Compared to the case where the entire end portion is thermally fused, the fusion property of the separator is also increased. As a result, even when the battery temperature rises, it is possible to prevent a short circuit with the opposite electrode due to the shrinkage of the separator.

In the above description, an example has been described in which both the positive electrode and the negative electrode are covered by the envelope-type separator, or either the positive electrode or the negative electrode may be covered.

On the other hand, when explaining the electrode coated with the separator, as shown in FIG. 9(A), the separator 4 is intermittently joined at the outer periphery of the anode electrode 2 to provide a fusion-bonded portion 6 . And in contact with the adjacent fusion splicing portion 6, intermittently fusion sealing portion 7 is provided on the outer periphery of the fusion splice portion 6, and on the outer periphery of the region between the intermittently provided fusion splice portions 6, a fusion sealing portion is provided in contact with the fusion junction portion have.

Therefore, since the regions between the intermittently provided fusion-sealed portions 6 are joined by the fusion-sealed portion, it is possible to prevent the active material peeled off from the positive electrode from flowing out to the outside of the separator.

9(B) shows that the separator 4 is intermittently joined at the outer periphery of the anode electrode 2 to provide a fusion spliced portion 6 . And the continuous fusion sealing part 7 is provided in the outer peripheral part of the fusion splicing part 6 in contact with the fusion splicing part 6 . The fusion-sealed portion 7 is preferably provided in contact with the fusion-bonded portion 6 . Thereby, formation of the space in which the positive electrode active material peeled from a positive electrode stays between the outer fusion-sealing parts of a fusion-bonded part can be prevented.

9(C) shows that the separator 4 is intermittently joined at the outer periphery of the anode electrode 2 to provide a fusion spliced portion 6 . And the continuous fusion sealing part 7 is provided in the inner peripheral part of the fusion-bonding part 6 in contact with the fusion-bonding part 6 .

In the battery electrode as described above, since the separator 4 positioned on both sides of the positive electrode 2 needs to be joined with sufficient strength in the intermittent fusion junction 6, when the fusion junction 6 is formed, the separator is sufficiently It is necessary to form a fusion zone by applying sufficient temperature and pressure to melt and join.

On the other hand, since the fusion sealing portion prevents the positive active material peeled from the positive electrode from leaking to the outside of the separator between the intermittently provided fusion junctions, a bonding force comparable to that of the fusion junction is not required. The negative fusion strength may not exceed the strength of the fusion joint portion.

In addition, since the fusion-sealed portion has a smaller bonding strength than the fusion-bonded portion, it is not provided in a portion where the positive electrode or the negative electrode may come in direct contact, such as the inside of the fusion-bonded portion, but is formed on the outer periphery of the fusion-bonded portion or in the region between the fusion-bonded portions. it is preferable

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

As shown in FIG. 10(A) , the positive electrode 2 is disposed by providing a predetermined interval between the strip-shaped separators 4 .

As shown in FIG. 10(B) , the lamination 400 forms a fusion junction 6 by providing a gap around the anode electrode 2 of the separator 4 and fusion-bonding.

The fusion by the lamination 400 may be performed by any fusion means such as heat fusion by adhering the heated fusion means, ultrasonic fusion, high frequency fusion, and the like.

Then, as shown in FIG. 10(C), the lamination 400 is the outer periphery of the fusion-sealed portion 6, and the fusion-sealed portion 7 is in contact with the adjacent fusion-bonded portions between the adjacent fusion-bonded portions 6). to form

On the other hand, as shown in FIG. 10(D), the cutting line 8 may be cut, and the cutting line 8 may be in the fusion sealing portion 7 .

In addition, it is preferable to cool the separator between the fusion-seal forming process and the fusion-sealing part forming process, or between the fusion-sealing part forming process and the cutting process. By cooling the separation membrane between processes in this way, thermal deformation of the separation membrane can be reduced.

In the above description, an example has been described in which two separators are placed above and below the electrode of the battery to form an envelope. can be produced with

Although the stacked secondary battery of the present invention can be applied to various batteries, the case of a lithium ion battery will be described below.

The positive electrode active material includes lithium cobalt oxide, lithium manganate, lithium nickel oxide, transition metal lithium composite oxide of lithium cobalt nickel oxide, lithium titanium sulfide, lithium molybdenum sulfide, lithium selenide niobium that can be doped with lithium ions, and the like. organic compounds such as chalcogenide, polypyrrole, polythiophene, polyaniline, polyacene compound, polyacetylene, polyallylene vinylene, dithiol derivative, and disulfide derivative, and mixtures thereof.

And as the current collector of the positive electrode, a metal such as aluminum or an alloy thereof, or titanium can be used.

In addition, a carbon-based material such as graphite, amorphous carbon, or the like, a tin-based composite oxide, etc. can be used for the negative electrode. Copper, nickel, its alloy, etc. can be used for a negative electrode collector. In addition, the separator covering the positive electrode or the negative electrode of the present invention may use a film such as porous polyethylene or polypropylene.

Further, in the multilayer secondary battery of the present invention, the positive electrode or the negative electrode coated with the bag-type separator produced as described above is accommodated in a metal battery can and sealed or covered with a flexible material and sealed with a misalignment battery. can also be applied to

On the other hand, in the lamination device for a secondary battery according to the third embodiment of the present invention, the positive electrode and the separator or the negative electrode and the separator are combined through the matching device 300 before manufacturing the stacked secondary battery by the laminator 400 . At the same time, primary bonding can be performed, and accordingly, tilting or flow of the positive electrode or the negative electrode coated on the separator can be prevented, and as a result, the defect rate can be greatly reduced.

That is, the matching device 300 aligns the electrode (positive electrode or negative electrode) supplied by the electrode supply device and the separator supplied by the separator supply device and simultaneously performs primary bonding to prevent tilting. and a transfer member for transferring the first bonded electrode and the separator.

And the matching member 310 includes a first heating unit 311 for heating the separation membrane supplied by the separation membrane supply device, the separation membrane heated by the first heating unit 311 and the electrode supply device. and a first pressure roller 312 for primary bonding as well as matching the supplied electrodes. The scope of the present invention is indicated by the following claims rather than the above detailed description, and the meaning and scope of the claims; Various embodiments derived from the concept of equivalents are possible.

100: electrode supply device
200: separator supply device
300: coincidence device
310: coincident member
311: first heating unit
312: first pressure roller
320: transfer member
400: laminator
410: second heating unit
420: second pressure roller

Claims (16)

an electrode supply device for supplying an electrode;
a separator supplying device for supplying a separator to cover both surfaces of the electrode;
A matching member for preventing tilting by first bonding the electrode supplied by the electrode supply device and the separator supplied by the separator supply device to coincide with each other, and transferring the primary bonded electrode and the separator a matching device having a transfer member; and
and a laminator for laminating the primary bonded electrode and the separator transferred by the transfer member by secondary bonding;
The matching member includes a first heating part for heating the separator supplied by the separator supply device, and at the same time matching the separator heated by the first heating part and the electrode supplied by the electrode supply device 1 It includes a first pressure roller for car bonding;
The first heating unit is supported on an inner surface of the separator in close contact with the electrode and includes a first heating roller provided with a heating part for heating the inner surface of the separator. delete delete The method according to claim 1,
The first pressure roller is a lamination device for a secondary battery for pressing the outer surface of the separator that is not preheated by the first heating roller. The method according to claim 1,
The first heating unit may further include a second heating roller having a heating unit configured to pressurize and simultaneously heat the inner surface of the separator wound around the first pressure roller. 6. The method of claim 5,
The first heating roller guides the separation membrane moving in the first direction to move in a second direction changed by 90 degrees from the first direction,
The second heating roller is installed to be spaced apart from the first heating roller in the second direction,
The first pressure roller guides the separator moving in the second direction to move in a third direction 180 degrees from the second direction. 6. The method of claim 5,
The first heating roller and the second heating roller are a lamination device for a secondary battery for heating the inner surface of the separator at the same temperature. 6. The method of claim 5,
The heating unit is formed on the entire main surface of the first heating roller and the second heating roller in order to bond the entire adhesion surface of the separator and the electrode to the secondary battery lamination device for heating the entire inner surface of the separator. 6. The method of claim 5,
The heating part is formed on a part of the main surfaces of the first heating roller and the second heating roller so that only a part of the adhesion surface of the separator and the electrode is bonded, while heating only a part of the inner surface of the separator. Device. The method according to claim 1,
The transfer member is a lamination device for a secondary battery provided as a feeding belt (feeding belt). The method according to claim 1,
The laminator includes a second heating unit for preheating by applying heat to the primary bonded electrode and the separator transferred by the transfer member, and the primary bonded electrode and the separator preheated by the second heating unit, pressurizing the separator A lamination device for a secondary battery including a second pressure roller for lamination. A supply step of supplying an electrode and a separator (S10);
Matching and transporting provided in a first process of preventing tilting by first bonding the electrode and the separator supplied by the supply step and at the same time, and a second process of transferring the primary bonded electrode and the separator step (S20); and
a lamination step (S30) of laminating the primary bonded electrode and the separator transferred by the matching and transferring step by secondary bonding;
In the supplying step (S10), the separator is supplied to cover both surfaces of the electrode;
In the first process, the separator supplied by the supplying step is preheated, and the preheated separator and the electrode supplied by the supplying step are matched and first bonded at the same time;
The first process is a secondary battery lamination method of preheating by applying heat to the inner surface of the separator in close contact with the electrode. delete delete an electrode supply device for supplying an electrode;
a separator supplying device for supplying a separator so that both surfaces of the electrode are covered;
A matching member for preventing tilting by first bonding the electrode supplied by the electrode supply device and the separator supplied by the separator supply device to coincide with each other, and transferring the primary bonded electrode and the separator a matching device having a transfer member; and
and a laminator for secondary bonding of the primary bonded electrode and the separator transferred by the transfer member to complete a stacked secondary battery,
In the laminated secondary battery by the laminator, both sides of the electrode are covered with a separator, and at the same time, the separator is joined by a fusion splicing portion in which a gap is provided around the electrode, and the inner periphery, outer periphery, or adjacent fusion junction portion of the fusion junction portion A lamination device for a secondary battery in which the separator accommodating the electrode is sealed by providing a fusion bonding portion continuously fused therebetween. 16. The method of claim 15,
The matching member includes a first heating part for heating the separator supplied by the separator supply device, and at the same time matching the separator heated by the first heating part and the electrode supplied by the electrode supply device 1 A lamination device for a secondary battery comprising a first pressure roller for secondary bonding.

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