WO2022092570A1 - Method for manufacturing pocketed positive electrode plate, pocketed positive electrode plate, and electrode assembly including pocketed positive electrode plate - Google Patents

Abstract

A method for manufacturing a pocketed positive electrode plate according to an embodiment of the present invention comprises the steps of: forming or applying a positive electrode active material on the surface of a positive electrode current collector; punching or cutting the positive electrode current collector to form a positive electrode having the same shape; preparing a separator; positioning an insulating member on one surface of the separator; arranging the positive electrode in a positive electrode receiving portion of the insulating member; folding the separator in a state in which the positive electrode is arranged in the positive electrode receiving portion, and attaching the separator to the insulating member; and cutting the insulating member and the separator to form a pocketed positive electrode plate.

Description

Method for manufacturing a pocketing anode body, an electrode assembly comprising a pocketing anode body and a pocketing anode body

The present invention relates to a method for manufacturing a pocketing positive electrode body, to an electrode assembly including a pocketing positive electrode body and a pocketing positive electrode body, and more particularly, to a method for manufacturing a pocketing positive electrode body capable of improving the capacity of a lithium secondary battery , to an electrode assembly comprising a pocketing anode body and a pocketing anode body.

With the recent development of the high-tech electronic industry, the use of portable electronic devices and various types of mobile devices is increasing as electronic equipment can be made smaller and lighter. As the need for a battery having a high energy density as a power source for such portable electronic devices and mobile devices is increasing, research on lithium secondary batteries is being actively conducted.

In particular, the rapid thinning and miniaturization of electronic devices and mobile devices is rapidly expanding the demand for thin-walled lithium secondary batteries, while the structure and/or manufacturing method of the existing cylindrical or prismatic lithium secondary batteries has made the battery thinner. There is a limit that it is not excellent in terms of energy density per volume according to the Accordingly, when a thin battery having a thickness of 5 mm or less is used for high-performance portable electronic devices such as mobile phones, camcorders, and notebook computers, it is difficult to obtain sufficient driving time.

Specifically, the prismatic lithium secondary battery has poor battery efficiency compared to the volume due to the electrode body structure having a jelly roll shape, and due to technical restrictions on reducing the wall thickness of the metal packaging material manufactured by low-temperature stretching, the battery thickness is decreases and the energy density decreases.

On the other hand, in the case of a pouch-type lithium secondary battery formed by sealing the stacked electrode assembly with an aluminum laminate packaging material, the waste of space generated by the jelly roll can be reduced, but the internal space of the battery is consumed due to the uncoated area of the electrode. As a result, there is a problem in that the capacity of the battery is damaged. That is, the uncoated area to which the active material is not applied of the electrode is formed to protrude from the electrode, and the uncoated area is also accommodated in the pouch, but the space accommodating the uncoated area is a wasted space.

The present applicant has proposed the present invention in order to solve the above problems.

The present invention has been proposed to solve the above problems, and by forming an electrode uncoated part on which an electrode active material is not formed so as not to protrude from the electrode, a pocketing method for manufacturing a positive electrode body, which can reduce wasted space in the electrode, pocketing An electrode assembly including an anode body and a pocketing anode body is provided.

The present invention provides a method for manufacturing a pocketing positive electrode body capable of improving or improving the capacity of a lithium secondary battery, and an electrode assembly including the pocketing positive electrode body and the pocketing positive electrode body.

Since the present invention includes a pocketing positive electrode body formed in a pocketing structure with the electrode uncoated part not protruding from the edge of the electrode, pocketing positive electrode body capable of improving the energy density of a lithium secondary battery including the same It provides an electrode assembly comprising a manufacturing method, pocketing anode body and pocketing anode body.

A method of manufacturing a pocketing positive electrode body according to an embodiment of the present invention for achieving the above object includes the steps of forming or applying a positive electrode active material on the surface of a positive electrode current collector; forming a positive electrode having the same shape by punching or cutting the positive electrode current collector; providing a separation membrane; positioning an insulating member on one surface of the separator; disposing the positive electrode in the positive electrode receiving portion of the insulating member; adhering the separator to the insulating member by folding the separator in a state in which the anode is disposed in the cathode accommodating part; and forming a pocketing anode body by cutting the insulating member and the separator.

In the step of forming or applying the positive electrode active material on the surface of the positive electrode current collector, the positive electrode active material may or may not be formed on the plurality of positive electrode uncoated portions formed at regular intervals along the longitudinal edge of the positive electrode current collector.

The positive electrode uncoated portion may be formed inside the longitudinal edge of the positive electrode current collector and not protrude outward from the edge.

The plurality of positive electrode uncoated portions disposed along the longitudinal direction of the positive electrode current collector may be alternately removed and cut.

In the step of preparing the separator, a plurality of holes are formed along the longitudinal center line of the separator and are formed at positions coincident with the positions of the anode uncoated parts, and both longitudinal ends of the separator and the holes are symmetrical with respect to the center line. It can be formed so that

In the step of locating the insulating member on one surface of the separator, the insulating member is provided to surround the thickness surface of the anode except for one side where the anode uncoated part is located, and one end of the insulating member is a longitudinal centerline of the separator It may be adhered to the separator in a state consistent with the

In the step of disposing the positive electrode in the positive electrode receiving portion of the insulating member, the positive electrode is placed in the positive electrode receiving portion so that the positive negative electrode uncoated portion is positioned in the hole of the separator, and the positive uncoated portion includes a cut portion and a removed portion Alternately, the holes may be located.

In the step of forming the pocketing anode body by cutting the insulating member and the separator, the separator is folded along the longitudinal center line of the separator and adhered to the upper surface of the insulating member. A direction crossing the longitudinal center line A central portion of the insulating member positioned along the longitudinal direction may be cut.

On the other hand, according to another field of the invention, the present invention, a positive electrode current collector on which a positive electrode active material is applied or formed; an insulating member formed integrally with the positive electrode current collector and provided to surround the thickness surface of the positive electrode current collector on three surfaces except for the positive electrode uncoated portion on which the positive electrode active material is not applied; and a separator adhered to the insulating member to cover the upper and lower surfaces of the positive electrode current collector, wherein the separator is adhered to the upper and lower surfaces of the insulating member and integrally formed on the upper and lower surfaces of the positive electrode current collector A pocketing anode body may be provided.

The separator may be provided to cover the thickness of the positive electrode current collector on the side where the positive electrode uncoated part is located, and upper and lower surfaces of the positive electrode current collector.

The positive electrode uncoated part may be formed so as not to protrude outwardly from an edge of the positive electrode current collector or not to protrude outwardly from the separator.

A hole through which the anode uncoated part is exposed may be formed in the separator.

The two holes may be formed along one side of the positive electrode current collector, and one hole of the two holes may be formed so that the positive electrode uncoated portion is exposed, and the other hole may be formed such that the positive electrode unpainted portion is not removed and positioned.

Both ends of the positive electrode uncoated portion positioned to be exposed to the hole in the width direction may be cut to be separated from the positive electrode current collector.

In addition, the present invention, the pocketing positive electrode body; and a negative electrode body alternately stacked with the pocketing positive electrode body, wherein the negative electrode body is integrally formed with a negative electrode current collector on which a negative electrode active material is applied or formed and the negative electrode current collector, and the negative electrode active material is not applied or formed It is possible to provide an electrode assembly including an uncoated negative electrode, wherein the negative electrode uncoated portion is provided so as not to protrude outward from the edge of the negative electrode current collector.

The negative electrode uncoated part is located above or below the hole of the separator where the anode uncoated part is not located, and the negative electrode uncoated part located above or below the positive uncoated part exposed to the hole of the separator is removed so that it does not exist can be formed.

Both ends of the negative electrode uncoated portion positioned above or below the hole of the separator may be cut to be separated from the negative electrode current collector.

The electrode assembly including the pocketing positive electrode body manufacturing method, pocketing positive electrode body and pocketing positive electrode body according to the present invention forms the uncoated area on which the electrode active material is not formed so as not to protrude from the edge of the electrode, thereby reducing the space wasted in the electrode. can be reduced

The electrode assembly including the pocketing positive electrode body manufacturing method, pocketing positive electrode body and pocketing positive electrode body according to the present invention can improve or improve the capacity of a lithium secondary battery.

The method for manufacturing a pocketing anode body according to the present invention, the pocketing anode body and the electrode assembly including the pocketing anode body have a shape in which the uncoated part does not protrude from the edge of the electrode and surrounds the anode body with a separator and an insulating film Since the pocketing anode body formed in the pocketing structure is included, the energy density of the lithium secondary battery can be improved.

1 is an exploded perspective view of a lithium secondary battery according to an embodiment of the present invention.

2 and 3 are views for explaining a method of manufacturing a positive electrode body and a negative electrode body of a lithium secondary battery according to an embodiment of the present invention, and are views showing a positive electrode current collector and a negative electrode current collector provided in a band shape.

4 to 7 are views showing positive and negative electrodes formed by cutting the strip-shaped positive electrode current collector and the negative electrode current collector according to FIGS. 2 and 3 .

8 is a view showing a separator used in a pocketing anode body according to an embodiment of the present invention.

9 and 10 are views showing an insulating member used in a pocketing anode body according to an embodiment of the present invention.

11 is a view showing a state in which the insulating member according to FIG. 10 is placed on the separator according to FIG. 8 .

12 is a view showing a state in which an anode is placed on the insulating member shown in FIG. 11 .

13 is a view showing a state after folding the upper portion of the separator shown in FIG. 12 .

14 and 15 are views showing a pocketing anode body and a cathode body according to an embodiment of the present invention.

16 and 17 are cross-sectional views taken along cut lines A1-A1 and A2-A2 of FIG. 14 .

18 to 20 are views showing an electrode assembly formed by alternately stacking the pocketing positive electrode body and the negative electrode body shown in FIGS. 14 and 15 .

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited or limited by the examples. Like reference numerals in each figure indicate like elements.

1 is an exploded perspective view of a lithium secondary battery according to an embodiment of the present invention, FIGS. 2 and 3 are views for explaining a method of manufacturing a positive electrode body and a negative electrode body of a lithium secondary battery according to an embodiment of the present invention. , a view showing a positive electrode current collector and a negative electrode current collector prepared in a band shape, FIGS. 4 to 7 are views showing a positive electrode and a negative electrode formed by cutting the band-shaped positive electrode current collector and the negative electrode current collector according to FIGS. 2 and 3; FIG. 8 is a view showing a separator used in a pocketing anode body according to an embodiment of the present invention, FIGS. 9 and 10 are views showing an insulating member used in a pocketing anode body according to an embodiment of the present invention, FIG. 11 is a view showing a state in which the insulating member according to FIG. 10 is placed on the separator according to FIG. 8, FIG. 12 is a view showing a state in which an anode is placed on the insulating member shown in FIG. 11, and FIG. 13 is the separator shown in FIG. A view showing a state after folding the upper part, FIGS. 14 and 15 are views showing a pocketing anode body and a cathode body according to an embodiment of the present invention, FIGS. 16 and 17 are cut lines A1-A1 and A2 of FIG. 14 A cross-sectional view taken along line A2, FIGS. 18 to 20 is a view showing an electrode assembly formed by alternately stacking the pocketing anode body and the cathode body shown in FIGS. 14 and 15 .

The electrode assembly including the pocketing positive electrode body, the pocketing positive electrode body and the pocketing positive electrode body manufacturing method according to an embodiment of the present invention described below is used in a lithium secondary battery, and is of a pouch type. The lithium secondary battery 100 is described as an example, but is not limited thereto.

Hereinafter, with reference to the drawings, the pocketing positive electrode body 120 and the method for manufacturing the electrode assembly 110 including the same according to an embodiment of the present invention, and the pocketing positive electrode body 120 and the electrode assembly 110 manufactured thereby ) will be described in detail.

First, referring to FIG. 1 , a lithium secondary battery 100 according to an embodiment of the present invention may include a pouch-type battery case 101 and an electrode assembly 110 accommodated in the battery case 101 . can

The battery case 101 is a pouch made of a flexible material. In addition, the battery case 101 accommodates and seals the electrode assembly 110 so that a portion of the positive and negative leads 210 and 310 (refer to FIG. 20 ), that is, the terminal portion is exposed. As shown in FIG. 1 , the battery case 101 includes an upper pouch 102 and a lower pouch 103 . A cup portion 105 is formed in the lower pouch 103 to provide an accommodating space 104 capable of accommodating the electrode assembly 110 , and the upper pouch 102 has the electrode assembly 110 in the battery case 101 . The accommodating space 104 is covered from the top so as not to be separated to the outside. In FIG. 1 , the cup portion 105 is illustrated as being formed only in the lower pouch 103 , but the present invention is not limited thereto and may be formed in various ways, such as may be formed in the upper pouch 102 . The upper pouch 102 and the lower pouch 103 may be manufactured with one side connected to each other as shown in FIG.

1 and 20, anode leads and cathode leads 210 and 310 are connected to the electrode tabs 200 and 300 of the electrode assembly 110, and insulating parts 220 and 320 are formed on a portion of the anode and cathode leads 210 and 310. formed, the electrode assembly 110 is accommodated in the receiving space 104 provided in the cup portion 105 of the lower pouch 103 , and the upper pouch 102 covers the receiving space 104 from the top. Then, the electrolyte is injected therein and the sealing part formed on the edges of the upper pouch 102 and the lower pouch 103 is sealed. The electrolyte is for moving lithium ions generated by the electrochemical reaction of the electrode during charging and discharging of the lithium secondary battery 100, and uses a non-aqueous organic electrolyte or polymer electrolyte, which is a mixture of lithium salt and high-purity organic solvents. It may include a polymer. Through this method, the pouch-type lithium secondary battery 100 can be manufactured.

Hereinafter, with reference to FIGS. 2 to 20 , the pocketing positive electrode body 120 used in the electrode assembly 110 and the electrode assembly 110 of the lithium secondary battery 100 according to an embodiment of the present invention and its manufacture A method will be described.

2 to 17 , the pocketing positive electrode body 120 according to an embodiment of the present invention includes the steps of forming or applying a positive electrode active material on the surface of the positive electrode current collector 121 ; forming a positive electrode 122 of the same shape by punching or cutting the positive electrode current collector 121; providing a separation membrane 160; adhering the lower surfaces of the insulating members 170 and 180 to one surface of the separator 160; disposing the positive electrode 122 in the positive electrode receiving portions 171 and 181 of the insulating member 170 and 180; Folding the separator 160 in a state in which the positive electrode 122 is disposed in the positive electrode accommodating portions 171 and 181 and adhering it to the upper surfaces of the insulating members 172 and 181; and forming the pocketing anode body 120 by cutting the insulating members 170 and 180 and the separator 160 .

2 and 3 show the positive electrode current collector 121 and the negative electrode current collector 141 in a band shape, respectively.

In the step of forming or applying the positive electrode active material on the surface of the positive electrode current collector 121 , first, the strip-shaped positive electrode current collector 121 is supplied in the longitudinal direction, and in this process, the positive electrode active material is applied to both surfaces of the positive electrode current collector 121 . (top and bottom) or it can be applied or coated on either side. The strip-shaped positive electrode current collector 121 may be supplied or transferred from left to right or from right to left along its longitudinal direction by a roll to roll method.

The negative electrode current collector 141 may be made of a metal having a long band shape like the positive electrode current collector 121 . As the negative electrode current collector 141 is transported (supplied) along the longitudinal direction, the negative electrode active material may be applied or coated on both surfaces or one surface thereof.

In this case, the positive electrode active material and the negative electrode active material are not applied or coated on the positive electrode uncoated portion 127 and the negative negative electrode uncoated portion 147 , respectively. That is, the positive electrode current collector 121 and the negative electrode current collector 141 may include a positive electrode uncoated portion 127 and a negative electrode uncoated portion 147 to which a positive electrode active material and a negative electrode active material are not applied, respectively.

Here, a plurality of positive electrode uncoated parts 127 and negative negative electrode uncoated parts 147 may be formed at the edges of the positive electrode current collector 121 and the negative electrode current collector 147 in the longitudinal direction, respectively, at regular intervals. In this case, the anode uncoated portion 127 and the negative uncoated portion 147 may be formed on only one of the longitudinal edges, or may be formed on both sides, respectively. 2 and 3, the anode uncoated part 127 and the negative electrode uncoated part 147 are formed on one side in the longitudinal direction, respectively.

In this way, in the step of forming or applying the positive electrode active material on the surface of the positive electrode current collector 121 , the positive electrode non-coating portion 127 formed at regular intervals along the longitudinal edge of the positive electrode current collector 121 includes the positive electrode. The active material may or may not be formed.

Meanwhile, the positive electrode uncoated part 127 may be formed inside the longitudinal edge of the positive electrode current collector 121 and not protrude outward from the edge. Referring to FIG. 2 , it can be seen that the positive electrode uncoated portion 127 is formed to be located inward from the longitudinal edge of the positive electrode current collector 121 and is not formed to protrude outward from the edge.

Similarly, the negative electrode uncoated portion 147 may be formed inside the longitudinal edge of the negative electrode current collector 141 and not protrude outward from the edge (see FIG. 3 ).

In the lithium secondary battery 100 according to an embodiment of the present invention, the positive electrode uncoated portion 127 and the negative negative electrode uncoated portion 147 to which the active material is not applied are the edges of the positive electrode current collector 121 and the negative electrode current collector 147, respectively. Because it is located inside the current collector without protruding from the outside, the internal space of the battery wasted due to the protruding uncoated region can be eliminated, and the battery capacity can be increased by that amount.

In the state shown in FIG. 2 , the plurality of positive electrode uncoated parts 127 disposed along the longitudinal direction of the positive electrode current collector 121 may be alternately removed and cut. That is, referring to FIG. 2 , a plurality of positive electrode uncoated portions 127 are formed at regular intervals along the longitudinal edge of the positive electrode current collector 121 , and any one of the positive electrode uncoated portions 127 is cut and removed. do. At this time, the edge of the anode uncoated portion 127 is cut to remove the anode uncoated portion 127 . The anode uncoated parts 127 positioned on both sides of the removed anode uncoated parts 127 are not removed.

The anode uncoated portion 127 positioned on both sides of the removed positive electrode uncoated portion 127 is cut along the edge of the positive uncoated portion 127 instead of being removed. At this time, both sides of the positive electrode uncoated part 127 are cut in the width direction, and the other side is not cut. In this case, only the lower end in the longitudinal direction of the positive electrode uncoated part 127 is connected to the positive electrode current collector 121 .

In the state shown in FIG. 3 , the anode uncoated part 147 also removes the plurality of negative uncoated parts 147 arranged along the longitudinal direction of the anode current collector 141 in turn, and can be cut

On the other hand, the positive and negative electrodes alternately stacked to form the electrode assembly 110 of the lithium secondary battery 100 according to an embodiment of the present invention are not band-shaped electrodes, but as shown in FIGS. 4 and 5 . It may be formed by alternately stacking the anode 122 and the cathode 142 having the same shape.

An anode 122 is shown in FIG. 4 , and a cathode 142 is shown in FIG. 3B . The positive electrode 122 illustrated in FIG. 4 includes a portion 125 from which the positive electrode uncoated portion 127 is removed and a positive uncoated portion ( If the 127) is cut to be included one by one, the positive electrode 122 shown in FIG. 4 can be obtained.

Similarly to the positive electrode 122 , the negative electrode 142 shown in FIG. 5 is a portion 145 from which the negative electrode non-coating part 147 is removed from the band-shaped negative electrode current collector 141 shown in FIG. 3 . ) and the negative electrode uncoated portions 147 cut on both sides in the width direction are cut to include one negative electrode 142 shown in FIG. 5 .

4 and 5 , it can be seen that the anode uncoated portion 127 and the negative uncoated portion 147 are positioned inside from the edges L1 and L2 of the electrodes, respectively, and do not protrude out of the edges L1 and L2. there is.

4 to 7 show the relative positions when the anode 122 and the cathode 142 are alternately stacked to form the electrode assembly 110 . The anode uncoated portion 127 corresponds to the removed portion 145 of the negative electrode uncoated portion 147 , and the negative uncoated portion 147 corresponds to the removed portion 125 of the positive uncoated portion 127 . The electrode assembly 110 may be obtained by alternately stacking the cathodes 142 . That is, the anode uncoated part 127 is located above or below the removal part 145 of the negative electrode uncoated part 147 , and the negative electrode uncoated part 147 is located above or below the removal part 125 of the positive electrode uncoated part 127 . The electrode assembly 110 may be obtained by alternately stacking the positive electrode 122 and the negative electrode 142 to be positioned at the lower side.

On the other hand, the electrode assembly 110 of the lithium secondary battery 100 according to an embodiment of the present invention is not obtained by alternately stacking the positive electrode 122 with the negative electrode 142, but insulating members 170 and 180 and the separator. It may be obtained by making the pocketing positive electrode body 120 surrounding the positive electrode 122 with 160 and alternately stacking the pocketing positive electrode body 120 and the negative electrode body 140 .

In order to obtain the pocketing anode body 120 , the anode 122 , the separator 160 , and the insulating members 170 and 180 are required.

In the step of preparing the separator 160 in the method of manufacturing the pocketing anode body 120 , the separator 160 as shown in FIG. 8 may be provided.

Referring to FIG. 8 , a plurality of holes 162 may be formed in the separation membrane 160 along the longitudinal center line C1 of the separation membrane 160 . Here, the hole 162 may be formed at a position coincident with the position of the anode uncoated part 127 or the portion 125 from which the anode uncoated part 127 is removed. In addition, both ends (edges of both sides of the long length) and the hole 162 in the longitudinal direction of the separation membrane 160 may be formed to be symmetrical with respect to the center line C1.

The anode 122 and insulating members 170 and 180 to be described later are placed on the separator 160 as shown in FIG. 8 .

9 and 10 show insulating members 170 and 180 . The insulating members 170 and 180 are members surrounding the thickness surface of the anode 122 . 9 and 10 , the insulating members 170 and 180 may include horizontal members 173 and 183 and a plurality of vertical members 171 , 172 , 181 , 182 connected to the horizontal members 173 and 183 .

Here, the vertical members 171 , 172 , 181 , and 182 may include the first vertical members 171 and 181 positioned at both ends of the horizontal members 173 and 183 and the second vertical members 172 and 182 positioned between the first vertical members 171 and 181 . The horizontal members 173 and 183 and the vertical members 171 , 172 , 181 , and 182 may be formed separately from each other, and the horizontal members 173 and 183 and the vertical members 171 , 172 , 181 and 182 may be integrally formed.

The thickness of the insulating members 170 and 180 is preferably the same as the thickness of the anode 122 . Anode accommodating portions 175 and 185 in which the anode 122 is positioned may be formed between the vertical members 171 , 172 , 181 , and 182 . The width of the anode accommodating portions 175 and 185 is preferably the same as or slightly larger than the width of the anode 122 . In addition, it is preferable that the width, length, and area of all the anode accommodating parts 175 and 185 are formed to be the same.

In the insulating member 170 shown in FIG. 9 , the widths of the first vertical member 171 , the second vertical member 172 , and the horizontal member 173 are the same. On the other hand, in the case of the insulating member 180 shown in FIG. 10 , the first vertical member 181 and the horizontal member 183 have the same width, but the second vertical member 182 has the first vertical member 181 . There is a difference in that it is formed to have a width that is twice that of . Therefore, in the case of the insulating member 180 shown in FIG. 10 , if the second vertical member 182 is cut along the middle portion in the longitudinal direction, a second vertical member 182 having the same width as that of the first vertical member 181 is obtained. can

In the case of the insulating member 180 shown in FIG. 10 , even if the width of the second vertical member 182 is twice that of the first vertical member 181 , the width or size of the positive electrode accommodating part 185 is preferably the same.

Meanwhile, the length of the horizontal members 173 and 183 of the insulating members 170 and 180 is preferably the same as the length of the separator 160 shown in FIG. 8 .

In the step of adhering the lower surfaces of the insulating members 170 and 180 to one surface of the separator 160, the insulating members 170 and 180 surround the thickness surface of the positive electrode 122 except for one side on which the positive electrode uncoated portion 127 is located. provided, and one end of the insulating members 170 and 180 may be adhered to the separator 160 in a state in which one end coincides with the longitudinal center line C1 of the separator 160 .

In FIG. 11 , a state in which the insulating member 180 shown in FIG. 10 is adhered to the separator 160 is illustrated. Referring to FIG. 11 , the horizontal member 183 of the insulating member 180 is provided with the same length as that of the separator 160 and is attached to the separator 160 so as to be positioned at either end of both longitudinal ends of the separator 160 . can be

In the case of FIG. 11 , the horizontal member 183 is adhered to the lower end of both ends of the separator 160 in the longitudinal direction. The lower ends of the vertical members 181 and 182 are connected to the horizontal member 183 or formed integrally with the horizontal member 183, and the upper ends of the vertical members 181 and 182 are provided to coincide with the longitudinal center line C1 of the separator 160. can be As described above, when the insulating member 180 is adhered to the separator 160 , two holes 162 of the separator 160 are positioned in each of the positive electrode receiving units 185 . In the state shown in FIG. 11 , the positive electrode 122 is placed in the positive electrode receiving part 185 .

In the step of disposing the positive electrode 122 in the positive electrode receiving portion 181 of the insulating member 180 , the positive electrode uncoated portion 127 and the portion 125 from which the positive electrode uncoated portion 127 is removed is formed of the separator 160 . The anode 122 is placed in the anode receiver 185 to be positioned in the hole 162 . In this case, the anode uncoated portion 127 from which both sides are cut in the width direction and the portion 125 from which the anode uncoated portion 127 is completely removed may be alternately positioned in the hole 162 .

Referring to FIG. 12 , four positive electrodes 122 are placed in the positive electrode receiving part 185 of the insulating member 180 . The positive electrode uncoated portion 127 of the positive electrode 122 does not cross the line connecting the upper ends of the vertical members 181 and 182 or the longitudinal center line C1 of the separator 160 . In the case of FIG. 12 , the positive electrode uncoated portion 127 is positioned on the upper left side of each positive electrode 122 , and the positive electrode uncoated portion 127 is completely removed and does not exist on the right side opposite to the positive electrode uncoated portion 127 .

In the state shown in FIG. 12 , the separator 160 is adhered to the upper surface of the insulating member 180 by folding the upper portion of the separator 160 downward in the direction of the arrow. 13 illustrates a state in which the upper portion of the separator 160 is folded and adhered to the upper surface of the insulating member 180 .

In the step of forming the pocketing anode body 120 by cutting the insulating member 180 and the separator 160 , the separator 160 is folded along the longitudinal center line C1 of the separator 160 to form the insulating member 180 . ) may be cut in the longitudinal direction of the insulating member 182 positioned along a direction crossing the longitudinal center line C1 of the separator in a state where it is adhered to the upper surface. That is, the insulating member 180 may be cut so that one positive electrode 122 is included in one pocketing positive electrode body 120 .

Referring to FIG. 13 , when cutting along the cutting line C2 positioned in the longitudinal center of the relatively wide second vertical member 182 of the insulating member 180 , the pocketing anode body 120 is obtained. can Here, the cutting line C2 is positioned in a direction crossing or perpendicular to the longitudinal center line C1 of the separator 160 .

In the case of FIG. 13, when cutting along three cutting lines C2, four pocketing anode bodies 120 shown in FIG. 14 may be made. Since the second vertical member 182 must be cut along, the width of the second vertical member 182 should be twice that of the first vertical member 181 .

In the pocketing positive electrode body 120 obtained by cutting along the cutting line C2, the widths of the insulating members 181 and 182 located on both sides of the pocketing positive electrode body 120 in the width direction are the same, and located at the bottom It is also equal to the width of the insulating member 183 .

14 shows the pocketing positive electrode body 120 obtained by the method for manufacturing the pocketing positive electrode body according to an embodiment of the present invention described above.

Referring to FIG. 14 , the anode 122 is positioned in a space formed or surrounded by the insulating member 180 and the separator 160 . This type of anode is referred to as a pocketing anode body 120 , and the encapsulation anode It may also be referred to as an encapsulation positive electrode body.

15 shows the pocketing positive electrode body 120 and the negative electrode body 140 alternately stacked. The negative electrode body 140 may be formed by applying or coating the negative electrode active material 149 on one or both surfaces of the negative electrode current collector 141 .

16 and 17 are cross-sectional views of the pocketing anode body 120 according to FIG. 14 . 16 is a cross-sectional view when the central portion of the pocketing anode body 120 is cut in the width direction. Referring to FIG. 116 , it can be seen that the positive electrode current collector 121 or the positive electrode 122 is surrounded by vertical members 181 and 182 of the separator 160 disposed on the top and bottom and the insulating member 180 disposed on the left and right. . That is, the positive electrode current collector 121 or the positive electrode 122 is positioned in a space formed by the separator 160 and the vertical members 181 and 182 , that is, a pocket, thereby forming the pocketing positive electrode body 120 .

17 is a cross-sectional view when the portion of the pocketing positive electrode body 120 where the positive electrode uncoated portion 127 is located is cut in the width direction. Referring to FIG. 17 , since the separator 160 is not positioned on the upper and lower surfaces of the anode uncoated portion 127 , the anode uncoated portion 127 is exposed, and nothing exists in the portion 125 from which the positive electrode unpainted portion 127 is removed. It can be seen that it does not

The pocketing positive electrode body 120 obtained by the manufacturing method of the pocketing positive electrode body 120 according to an embodiment of the present invention described above includes a positive electrode current collector 121 coated with or formed with a positive electrode active material; Insulative members 170 and 180 that are formed integrally with the positive electrode current collector 121 and are provided to surround the thickness surface of the positive electrode current collector 121 on three sides except for the positive electrode uncoated portion 127 on which the positive electrode active material is not applied or formed. ; and a separator 160 attached to the insulating members 170 and 180 to cover the upper and lower surfaces of the positive electrode current collector 121 . Here, the separator 160 may be adhered to the upper and lower surfaces of the insulating members 170 and 180 and integrally provided on the upper and lower surfaces of the positive electrode current collector 121 to form the pocketing positive electrode body 120 .

In the pocketing positive electrode body 120 according to an embodiment of the present invention shown in FIG. 14 , a separator 160 covering the upper and lower surfaces of the positive electrode current collector 121 or the positive electrode 122 is integrally formed. That is, a separator that covers the upper surface of the positive electrode current collector 121 or the positive electrode 122 and a separator that covers the lower surface of the positive electrode collector 121 or the positive electrode 122 are provided, respectively, so that two separators are not used, but one separator A structure that covers both the upper and lower surfaces of the positive electrode current collector 121 or the positive electrode 122 by using 160 .

Accordingly, one separator 160 includes the thickness side of the positive electrode current collector 121 or the positive electrode 122 on the side where the positive electrode uncoated part 127 is located, and the upper and lower surfaces of the positive electrode current collector 121 or the positive electrode 122 . may be provided to cover the On the other hand, the separator 160 is not located on the lower end of the positive electrode current collector 121 or the positive electrode 122 , that is, on the thickness surface of the horizontal members 173 and 183 of the insulating members 170 and 180 .

The positive electrode uncoated portion 127 of the pocketing positive electrode body 120 may be formed so as not to protrude outward from the edge of the positive electrode current collector 121 or the positive electrode 122 or to protrude outward from the separator 160 .

The pocketing anode body 120 may include one anode uncoated portion 127 and one portion 125 from which the anode uncoated portion 127 is removed.

A hole 162 through which the anode uncoated portion 127 is exposed is formed in the separator 160 , and the anode uncoated portion 127 may be provided in a form exposed through the hole 162 of the separator 160 .

Two holes 162 formed in the separator 160 are formed along one side of the positive electrode current collector 121 or the positive electrode 122 , and the positive electrode uncoated portion 127 is exposed in one of the two holes 162 . It may be positioned so as to be positioned so that the anode uncoated part 127 is not positioned in the remaining holes 162 . That is, the portion 125 from which the positive electrode uncoated portion 127 is removed may be located in the remaining hole 162 .

The positive electrode uncoated portion 127 exposed through the hole 162 of the separator 160 may be separated from the positive electrode current collector 121 or the positive electrode 122 by cutting both ends thereof in the width direction. 13 or 14 , only the lower end of the positive electrode uncoated part 127 exposed through the hole 162 of the separator 160 is connected to the positive electrode current collector 121 or the positive electrode 122 .

On the other hand, if the pocketing anode body 120 and the cathode body 140 are alternately stacked in the state shown in FIGS. 14 and 15 , the electrode assembly 110 according to an embodiment of the present invention can be obtained. That is, the anode uncoated part 127 is located above or below the removal part 145 of the negative electrode uncoated part 147 , and the negative electrode uncoated part 147 is located above or below the removal part 125 of the positive electrode uncoated part 127 . If the pocketing anode body 120 and the cathode body 140 are alternately stacked to be positioned at the lower side, the electrode assembly 110 as shown in FIGS. 18 to 20 can be obtained.

The electrode assembly 110 according to an embodiment of the present invention shown in FIGS. 18 to 20 includes the aforementioned pocketing anode body 120 ; and a cathode body 140 alternately stacked with the pocketing anode body 120 . Here, the negative electrode body 140 is integrally formed with the negative electrode current collector 141 and the negative electrode collector 141 on which the negative electrode active material 149 is applied or formed, and the negative electrode uncoated part ( 147 ), and the negative electrode uncoated part 147 may be provided so as not to protrude outward from the edge of the negative electrode current collector 141 .

In the electrode assembly 110 according to an embodiment of the present invention, the negative electrode uncoated portion 147 of the negative electrode body 140 has a hole 162 in the separator 160 that is not located because the positive uncoated portion 127 is removed. The negative electrode uncoated portion 147 located above or below the positive electrode uncoated portion 127 exposed through the hole 162 of the separator 160 may be removed so as not to exist.

In other words, when the pocketing positive electrode body 120 and the negative electrode body 140 are alternately stacked, the negative electrode uncoated portion 147 is removed above and below the positive uncoated portion 127 exposed through the hole of the separator 160 . The electrode assembly 110 as shown in FIG. 18 can be obtained by stacking the portion 145 on which the uncoated portion 145 is located and the portion 125 from which the anode uncoated portion 127 is removed so that the negative electrode uncoated portion 147 is positioned above and below the portion 125 . there is.

Similar to the positive electrode uncoated portion 127 of the pocketing positive electrode body 120 , the negative electrode uncoated portion 147 positioned above or below the hole 162 of the separator 160 is cut at both ends in the width direction, so that the negative electrode current collector (141) and can be separated. Referring to FIG. 15 , the negative electrode uncoated unit 147 may be provided in a state where only the lower end thereof is connected to the negative electrode current collector 141 .

19 shows an electrode assembly 110 in which all the anode uncoated parts 127 are pressed downward to connect them, and all the anode uncoated parts 147 are pressed downward to connect them together. As described above, since the positive electrode uncoated portion 127 and the negative electrode uncoated portion 147 are provided in a cantilever shape connected to the positive electrode current collector 121 and the negative electrode current collector 141 only at the lower ends, respectively, all the stacked positive electrode uncoated parts It is possible to form the positive electrode tab 200 by pressing 127 downward, and to form the negative electrode tab 300 by pressing all the stacked negative electrode uncoated parts 147 downward.

Referring to FIG. 20 , the electrode assembly 110 is illustrated in which the positive lead 210 is connected to the positive electrode tab 200 and the negative lead 310 is connected to the negative electrode tab 300 . When the electrode assembly 110 shown in FIG. 20 is put into the battery case 101 and the battery case 101 is sealed, a lithium secondary battery 100 can be obtained. In this case, the insulating portions 220 and 320 respectively formed on the positive lead 210 and the negative lead 310 may be adhered to the battery case 101 .

The electrode assembly 110 according to an embodiment of the present invention may be used not only in a pouch type lithium secondary battery but also in a release cell type lithium secondary battery. Here, the term “heterogeneous cell” refers to a battery in which the shape of the battery is not determined or in various shapes.

As described above, in the embodiments of the present invention, specific matters such as specific components, etc., and limited embodiments and drawings have been described, but these are only provided to help a more general understanding of the present invention, and the present invention is limited to the above embodiments Various modifications and variations are possible from these descriptions by those of ordinary skill in the art to which the present invention pertains. Therefore, the spirit of the present invention should not be limited to the described embodiments, and not only the claims described below, but also all of the claims and equivalents or equivalent modifications will fall within the scope of the spirit of the present invention.

Claims (17)

1. forming or applying a positive electrode active material on the surface of a positive electrode current collector;

   forming a positive electrode having the same shape by punching or cutting the positive electrode current collector;

   providing a separation membrane;

   positioning an insulating member on one surface of the separator;

   disposing the positive electrode in the positive electrode receiving portion of the insulating member;

   adhering the separator to the insulating member by folding the separator in a state in which the anode is disposed in the cathode accommodating part; and

   forming a pocketing anode body by cutting the insulating member and the separator;

   A method of manufacturing a pocketing anode body comprising a.
2. According to claim 1,

   In the step of forming or applying a positive electrode active material on the surface of the positive electrode current collector,

   The method of manufacturing a pocketing positive electrode body, characterized in that the positive electrode active material is not formed or applied to a plurality of positive electrode uncoated portions formed at regular intervals along the longitudinal edge of the positive electrode current collector.
3. 3. The method of claim 2,

   The positive electrode uncoated portion is formed inside the longitudinal edge of the positive electrode current collector and is formed so as not to protrude outward from the edge.
4. 4. The method of claim 3,

   A method of manufacturing a pocketing positive electrode body, characterized in that alternately removing and cutting the plurality of positive electrode uncoated parts arranged along the longitudinal direction of the positive electrode current collector.
5. 5. The method of claim 4,

   In the step of preparing the separation membrane,

   A plurality of holes are formed along the longitudinal center line of the separator and are formed at positions coincident with the positions of the anode uncoated parts,

   Both longitudinal ends of the separator and the hole are formed to be symmetrical with respect to the center line.
6. 6. The method of claim 5,

   In the step of adhering the lower surface of the insulating member to one surface of the separator,

   The insulating member is provided to surround the thickness surface of the positive electrode except for one side where the positive electrode uncoated part is located,

   The method of manufacturing a pocketing positive electrode body, characterized in that the one end of the insulating member is adhered to the separator in a state in which it coincides with the longitudinal center line of the separator.
7. 7. The method of claim 6,

   In the step of disposing the positive electrode in the positive electrode receiving portion of the insulating member,

   The positive electrode is placed on the positive electrode receiving part so that the positive electrode uncoated part is positioned in the hole of the separator, and the cut and removed part of the positive electrode uncoated part is alternately positioned in the hole. manufacturing method.
8. 8. The method of claim 7,

   In the step of forming a pocketing anode body by cutting the insulating member and the separator,

   In a state in which the separator is folded along the longitudinal center line of the separator and adhered to the upper surface of the insulating member, the lengthwise middle portion of the insulating member positioned along the direction intersecting the longitudinal center line is cut. A method for manufacturing a capped anode body.
9. a positive electrode current collector on which a positive electrode active material is applied or formed;

   an insulating member formed integrally with the positive electrode current collector and provided to surround the thickness surface of the positive electrode current collector on three surfaces except for the positive electrode uncoated portion on which the positive electrode active material is not applied or formed; and

   and a separator attached to the insulating member to cover the upper and lower surfaces of the positive electrode current collector;

   wherein the separator is adhered to the upper and lower surfaces of the insulating member and is integrally formed on the upper and lower surfaces of the positive electrode current collector.
10. 10. The method of claim 9,

    The separator is a pocketing positive electrode body, characterized in that it is provided to cover the thickness of the positive electrode current collector on the side where the positive electrode uncoated part is located, and the upper and lower surfaces of the positive electrode current collector.
11. 11. The method of claim 10,

    The positive electrode uncoated portion, pocketing positive electrode body, characterized in that formed so as not to protrude outward from the edge of the positive electrode current collector or to the outside from the separator.
12. 12. The method of claim 11,

    A pocketing anode body, characterized in that the separator has a hole through which the anode uncoated part is exposed.
13. 13. The method of claim 12,

    Two holes are formed along one side of the positive electrode current collector, and one hole of the two holes is positioned so that the positive electrode uncoated portion is exposed, and the other hole is formed so that the positive electrode unpainted portion is not removed and located. Pocketing anode.
14. 14. The method of claim 13,

    The pocketing positive electrode body, characterized in that both ends of the positive electrode uncoated portion positioned to be exposed to the hole are cut and separated from the positive electrode current collector.
15. The pocketing anode body according to claim 13; and

    Including; a cathode body alternately stacked with the pocketing anode body;

    The negative electrode body includes a negative electrode current collector on which a negative electrode active material is applied or formed, and a negative electrode uncoated portion formed integrally with the negative electrode current collector and on which the negative electrode active material is not applied or formed,

    The negative electrode uncoated part is provided so as not to protrude outward from the edge of the negative electrode current collector.
16. 16. The method of claim 15,

    The negative electrode uncoated part is located above or below the hole of the separator where the positive electrode uncoated part is removed and is not located,

    The electrode assembly, characterized in that the negative electrode uncoated portion positioned above or below the anode uncoated portion exposed through the hole of the separator is removed so as not to exist.
17. 17. The method of claim 16,

    Both ends of the negative electrode uncoated portion positioned above or below the hole of the separator are cut and separated from the negative electrode current collector.

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