KR20220126349A - Method of manufacturing pocketing positive electrode body and pocketing positive electrode body - Google Patents

Abstract

A pocketing positive electrode body according to an embodiment of the present invention comprises: a positive electrode including a positive electrode collector coated or formed with a positive electrode active material and a positive electrode uncoated portion on which the positive electrode active material is not coated or formed; an insulating member provided to surround a thickness surface of the positive electrode at an upper end of the positive electrode in which the positive electrode uncoated portion is located or at a lower end of the positive electrode facing the positive electrode uncoated portion; and first and second separators adhered to the insulating member to cover upper and lower surfaces of the positive electrode. The positive electrode can be provided to be prevented from moving left and right in a state of being provided between the insulating members even when there is no insulating members on left and right sides of the positive electrode. The present invention can improve the capacity of a lithium secondary battery.

Description

Manufacturing method of pocketing anode body and pocketing anode body

The present invention relates to a method for manufacturing 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 and a pocketing positive electrode body.

With the recent development of the high-tech electronic industry, small-scale and lightweight electronic equipment are made possible, and the use of portable electronic devices and various types of mobile devices is increasing. 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, whereas 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 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 its 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.

In addition, in the case of a positive electrode body that surrounds the positive electrode using a polymer insulating film and a separator, stacking and alignment with the negative electrode body are convenient, but due to the polymer insulating film surrounding the positive electrode along the thickness direction of the positive electrode, the capacity of the battery is reduced. In addition to the reduction, there may be a problem in that the rate at which the electrolyte is impregnated into the positive electrode is slowed by the polymer insulating film.

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

Korean Patent Registration No. 10-1168651 (Registration Announcement 2012.07.25.)

The present invention has been proposed to solve the above problems, and provides a method for manufacturing a pocketing positive electrode body capable of improving or improving the capacity of a lithium secondary battery and a pocketing positive electrode body.

The present invention provides a method for manufacturing a pocketing positive electrode body and a pocketing positive electrode body capable of reducing waste of an insulating member surrounding a positive electrode and increasing the area or size of the positive electrode by the reduced area of the insulating member.

The present invention provides a method for manufacturing a pocketing anode body and a pocketing anode body that can prevent the impregnation rate of the electrolyte from being slowed by the insulating member because the electrolyte is impregnated into the anode through the left and right sides of the anode in which the insulating member is not present to provide.

A method for manufacturing a pocketing positive electrode body according to an embodiment of the present invention for achieving the above object includes: providing a positive electrode; forming an anode accommodating part in the insulating member; providing a first separator; adhering a lower surface of the insulating member to one surface of the first separator; disposing the positive electrode in the positive electrode receiving portion of the insulating member; adhering the upper surface of the insulating member and the second separator such that a second separator covers the anode in a state in which the cathode is disposed in the cathode receiving part; and forming a pocketing anode body by cutting the insulating member and the separator.

In the step of forming the positive electrode accommodating portion on the insulating member, the positive electrode position is fixed at an edge of the positive electrode accommodating portion adjacent to either an upper end of the positive electrode in which the positive electrode uncoated portion of the positive electrode is located or a lower end of the positive electrode opposite to the positive uncoated portion An addition may be formed.

In the step of preparing the positive electrode, a matching portion matching the positive electrode position fixing portion may be formed at either one end of the upper end of the positive electrode where the positive electrode uncoated portion is located or the lower end of the positive electrode opposite to the positive electrode uncoated portion.

The positive electrode position fixing part and the mold fitting part may be formed at one end or an edge facing the positive electrode uncoated part.

In the step of forming the pocketing positive electrode body by cutting the insulating member and the separator, the insulating member may be cut so that the insulating member is not present at left and right ends of the positive electrode.

In the step of forming the pocketing anode body by cutting the insulating member and the separator, the insulating member adjacent to the upper end and the lower end of the anode may be cut to maintain the state in which the anode position fixing part is formed.

On the other hand, according to another field of the invention, the present invention, a positive electrode comprising a positive electrode current collector coated or formed with a positive electrode active material and a positive electrode uncoated portion on which the positive electrode active material is not coated or formed; an insulating member provided to surround a thickness surface of the positive electrode at an upper end of the positive electrode where the positive electrode uncoated portion is located or at a lower end of the positive electrode facing the positive electrode uncoated portion; and first and second separators adhered to the insulating member to cover the upper and lower surfaces of the positive electrode, wherein the positive electrode is provided between the insulating members even if the insulating member is not present on the left and right sides of the positive electrode It is possible to provide a pocketing anode body that does not move left and right.

A positive electrode position fixing unit may be formed on an edge or one surface of the insulating member facing either one of an upper end of the positive electrode where the positive electrode uncoated portion is positioned or a lower end of the positive electrode facing the positive electrode uncoated portion.

A molded portion matching the positive electrode position fixing portion may be formed at either one end of the upper end of the positive electrode where the positive electrode uncoated portion is located or the lower end of the positive electrode facing the positive electrode uncoated portion.

The molded portion may be formed only on one end of the positive electrode opposite to the positive electrode uncoated portion, and the positive electrode position fixing portion may be formed only on an edge of the insulating member facing the one end of the positive electrode opposite to the positive electrode uncoated portion.

The insulating member positioned on the left and right sides of the positive electrode uncoated part may be bent and extended along the longitudinal direction of the positive electrode uncoated part or may be formed to contact left and right ends of the positive electrode uncoated part.

The first and second separators are adhered to the insulating member positioned at an upper end or lower end of the positive electrode, and the insulating member is disposed between the first separator and the second separator positioned at left and right ends of the cathode. It can be formed so that it does not exist.

In the method for manufacturing a pocketing anode body and pocketing anode body according to the present invention, since there is no insulating member on the left and right sides of the positive electrode, the area or size of the positive electrode can be enlarged by that amount, and as the size of the positive electrode increases, the pocketing positive electrode body It is possible to improve or improve the capacity of the lithium secondary battery including the sieve.

In the method for manufacturing a pocketing anode body and pocketing anode body according to the present invention, since the pocketing anode body can be formed without insulating members on the left and right sides of the anode, waste of the insulating member can be reduced.

In the method for manufacturing a pocketing anode body and pocketing anode body according to the present invention, since the electrolyte is impregnated into the anode through the left and right sides of the anode in which the insulating member is not present, the impregnation rate of the electrolyte by the insulating member (the rate at which the electrolyte permeates into the anode) ) can be prevented from slowing down and the impregnation rate of the electrolyte can be increased.

1 is a plan view of an electrode assembly including a pocketing anode body according to an embodiment of the present invention.
2 is a side view and a bottom view of the electrode assembly according to FIG. 1 .
FIG. 3 is a plan perspective view of the pocketing anode body according to FIG. 1 ;
4 is a cross-sectional view and a bottom view taken along the cut line “CC” of FIG. 3 .
FIG. 5 is a view showing an insulating member used in the pocketing anode body according to FIG. 3 .
6 is a view showing a positive electrode disposed in the positive electrode receiving portion of the insulating member according to FIG. 5 .
FIG. 7 is a view showing a state in which the positive electrode according to FIG. 6 is placed in the positive electrode receiving part of the insulating member according to FIG. 5 .
8 is a view showing a state in which cut lines are drawn on the insulating member and the anode shown in FIG. 7 .
9 is a plan perspective view showing another embodiment of the pocketing anode body shown in FIG.

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 a plan view of an electrode assembly including a pocketing positive electrode body according to an embodiment of the present invention, FIG. 2 is a side view and a bottom view of the electrode assembly according to FIG. 1, and FIG. 3 is a pocketing positive electrode body according to FIG. A plan perspective view, FIG. 4 is a cross-sectional view and a bottom view taken along line “C-C” of FIG. 3 , FIG. 5 is a view showing an insulating member used in the pocketing anode body according to FIG. 3 , FIG. 6 is an insulating member according to FIG. 5 A view showing a positive electrode disposed in the positive electrode receiving portion of the, FIG. 7 is a view showing a state that the positive electrode according to FIG. 6 is placed in the positive electrode receiving portion of the insulating member according to FIG. 5, FIG. 8 is the insulating member and the positive electrode shown in FIG. FIG. 9 is a plan perspective view showing another embodiment of the pocketing anode body shown in FIG. 3 .

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

Hereinafter, with reference to the drawings, the pocketing positive electrode body 150 and the pocketing positive electrode body 150 manufacturing method according to an embodiment of the present invention, the electrode assembly 110 including the pocketing positive electrode body 150 Describe in detail.

1 is a plan view of an electrode assembly 110 including a pocketing anode body 150 according to an embodiment of the present invention.

The lithium secondary battery according to an embodiment of the present invention may include an electrode assembly 110 accommodated in a pouch-shaped battery case (not shown).

The electrode assembly 110 may be formed by alternately stacking pocketing anode bodies 150 and cathode bodies 160 . That is, the electrode assembly 110 may include a plurality of pocketing anode bodies 150 and cathode bodies 160 alternately stacked on each other.

As will be described later, in the pocketing positive electrode body 150 , the positive electrode 120 is provided in a shape surrounded by the separator 140 and the insulating member 130 , and the negative electrode body 160 is the pocketing positive electrode body 150 and Otherwise, it is not surrounded by the separator 140 and the insulating member 130 and may include the negative electrode current collector 161 and the negative electrode uncoated part 162 .

In the electrode assembly 110, when the pocketing positive electrode body 150 and the negative electrode body 160 are alternately stacked, the edges of the remaining three places except for the positive electrode uncoated portion 122 and the negative electrode uncoated portion 162 are The edges of the separator 140 and the insulating member 130 of the pocketing positive electrode body 150 and the edges of the negative electrode current collector 161 coincide with each other.

A fixing tape ( 112) can be added.

Meanwhile, FIG. 2A is a side view viewed from the direction B1 or B2 shown in FIG. 1 , and FIG. 2B is a bottom view viewed from the direction A2 shown in FIG. 1 .

1 and 2, in the electrode assembly 110 according to an embodiment of the present invention, two pocketing positive electrode bodies 150 and negative electrode bodies 160 are alternately stacked, respectively. The number of the positive electrode body 150 and the negative electrode body 160 may be determined according to the required battery capacity.

Referring to FIGS. 2A and 2B , in the case of the pocketing positive electrode body 150 , the separators 141 and 142 are positioned on the upper and lower surfaces of the positive electrode 120 or the positive electrode current collector 121 and the positive electrode 120 . The insulating member 130 is positioned at the upper end and lower end of the . That is, the insulating member 130 is not located at the left and right ends of the positive electrode 120 in the width direction, but the insulating member 130 is located at the top or the bottom of the positive electrode 120 where the positive electrode uncoated part 122 is located. It is preferable to have a form that

As such, in the pocketing positive electrode body 150 according to an embodiment of the present invention, unlike the conventional pocketing positive electrode body, the insulating member 130 is provided in a form that does not surround the entire side of the thickness surface of the positive electrode 120 . can

3 and 4, in the pocketing positive electrode body 150 according to an embodiment of the present invention, the positive electrode current collector 121 on which a positive electrode active material (not shown) is coated or formed, and the positive electrode active material is coated or formed. At the upper end of the anode 120 including the uncoated anode uncoated section 122, the upper end of the anode 120 where the anode uncoated section 122 is located, or the lower end of the anode 120 facing the anode uncoated section 122, the anode ( It may include an insulating member 130 provided to surround the thickness surface of the 120 , and first and second separators 141 and 142 attached to the insulating member 130 to cover the upper and lower surfaces of the anode 120 .

Here, the positive electrode 120 provides a pocketing positive electrode body 150 that does not move left and right in a state provided between the insulating members 130 even if the insulating member 130 is not present on the left and right sides of the positive electrode 120 . can do. In this case, left and right refer to the left and right sides in the x-axis direction shown in FIG. 3 , and upper and lower ends mean the upper and lower ends in the y-axis direction shown in FIG. 3 .

For reference, the insulating member 130 is formed of a material having the same material or properties as the insulating polymer film disclosed in Korean Patent Registration No. 10-1168651 of the applicant, and the separator 140 is also disclosed in Korean Patent Registration No. 10-1168651 It is preferably formed of a material having the same material or properties as the separator disclosed in .

FIG. 3 is a perspective view of the pocketing anode body 150 according to an embodiment of the present invention, and is a second second covering the upper surface of the anode 120 (that is, one of the widest flat surfaces of both surfaces). It is a view showing the inside of the separation membrane 142 .

As can be seen from FIG. 2 , in the pocketing positive electrode body 150 according to an embodiment of the present invention, the first separator 141 is disposed on the lower surface of the positive electrode 120 and the second separator 142 is located on the upper surface of the positive electrode 120 . ) is located. The positive electrode uncoated part 122 to which the positive electrode active material is not applied is exposed to the outside of the separator 140 rather than located inside the first and second separators 141 and 142 .

The edge of the separator 140 shown in FIG. 3 coincides with the edge of the negative electrode body 160 stacked or positioned on the upper and lower portions of the pocketing anode body 150 . Therefore, if the edge of the pocketing anode body 150, that is, the edge of the separator 140 and the edge of the cathode body 160 are stacked to match, a separate alignment operation is performed to make the electrode assembly 110. You do not have to do. That is, as long as the edge of the separator 140 and the edge of the negative electrode body 160 are aligned, the positive electrode 120 is positioned inside the edge of the negative electrode.

Referring to FIG. 3 , the insulating member 130 is not located on the left and right sides of the positive electrode 120 , and the upper end (ie, one end of the positive electrode uncoated portion 122 ) or the lower end (ie, the positive electrode) of the positive electrode 120 . Insulative members 131 and 133 may be positioned at one end (one end facing or opposite to the uncoated region 122 ). Like the anode 120 , the insulating members 131 and 133 may have first and second separators 141 and 142 on their lower and upper surfaces, respectively. The insulating member 130 and the separation layers 140 , 141 , and 142 may be bonded to each other by thermal bonding.

As such, the first and second separators 141 and 142 are adhered to the insulating member 130 positioned at the upper end or lower end of the cathode 120 , and the first separator positioned at the left and right ends of the cathode 120 ( The insulating member 130 may not be formed between the 141 and the second separator 142 .

As mentioned above, in the pocketing positive electrode body 150 according to an embodiment of the present invention, although the insulating members 131 and 133 are located only at the top or bottom of the positive electrode 120 , the insulating member 130 and the separator In a state in which the anode 120 is positioned in the space (pocketing space) surrounded by 140 , the anode 120 does not move left or right. If, in this state, the positive electrode 120 moves to the left or right, a part of the left or right side of the positive electrode 120 may be exposed from the edge of the separator 140 , and the positive electrode 120 exposed from the separator 140 may be When in direct contact with the cathode body 160, a short circuit may occur. However, the pocketing positive electrode body 150 according to an embodiment of the present invention can prevent the occurrence of a short circuit because the positive electrode 120 does not move to the left or right. In addition, since the insulating members positioned on the left and right sides of the positive electrode 120 can be removed, the length of the left and right sides of the positive electrode 120 can be increased by as much as the missing insulating member, and the capacity of the battery can be increased by that amount.

In the pocketing positive electrode body 150 according to an embodiment of the present invention, one end (top) of the positive electrode 120 on which the positive electrode uncoated portion 122 is positioned or one end of the positive electrode 120 opposite to the positive uncolored portion 122 is provided. Anode position fixing parts 132 and 134 may be formed on edges or one surface of the insulating members 131 and 133 facing one end of the (lower end).

In addition, at either one end of the upper end of the positive electrode 120 where the positive electrode uncoated portion 122 is positioned or the lower end of the positive electrode 120 opposite to the positive electrode uncoated portion 122, a matching portion ( 123,124) may be formed.

The pocketing anode body 150 according to an embodiment of the present invention is an anode by means of anode position fixing parts 132 and 134 and mating parts 123 and 124 respectively formed on one surface of the insulating members 131 and 133 and the anode 120 facing each other. 120 can be prevented from moving left or right.

Referring to FIG. 3 , the positive electrode position fixing units 132 and 134 are provided in the form of protrusions protruding toward the positive electrode 120 , and the molded portions 123 and 124 are provided in the form of concave grooves for accommodating the positive electrode position fixing units 132 and 134 . can be At this time, it is preferable that the anode position fixing parts 132 and 134 are provided in a form that is engaged with the mold parts 123 and 124 or accommodated in the mold parts 123 and 124 . In addition, it is preferable that the anode position fixing parts 132 and 134 protrude to a sufficient length so that the anode 120 does not move to the left or right, and the fitting parts 123 and 124 are also formed to be concave with a sufficient length.

In the case of FIG. 3 , the anode position fixing units 132 and 134 are formed at one location on the insulating member 130 , but two or more locations may be provided to prevent left or right movement of the anode 120 . That is, the positive electrode position fixing parts 132 and 134 are preferably formed in at least one or more places on the insulating member 130, and in accordance with this, the molded parts 123 and 124 are also formed in at least one or more places at the upper end or the lower end of the anode 120. have.

Referring to FIG. 3 , the first insulating member 131 positioned at the upper end of the anode 120 , that is, one end at which the anode uncoated portion 122 is formed, is a second insulating member 133 positioned at the lower end of the cathode 120 . and its shape is different.

The first insulating member 131 positioned on the upper end of the positive electrode 120 having the positive electrode uncoated portion 122 is preferably divided to be positioned on both sides of the positive electrode uncoated portion 122 . However, in some cases, a single first insulating member 131 may be provided in a form positioned on either one of the left side or the right side of the positive electrode uncoated unit 122 . When the first insulating member 131 is located only on either one side of the left or right side of the positive electrode uncoated unit 122 , the length of the upper end of the positive electrode 120 located on the left and right sides of the positive electrode uncoated unit 122 is relatively long. It is preferable to be located in the long part.

On the other hand, the first insulating member 131 positioned on the upper end of the positive electrode 120 having the positive electrode uncoated portion 122 is in contact with the left or right end of the positive electrode uncoated portion 122 as well as the positive electrode position fixing portion 132 . It may include a bent part 136 (refer to FIG. 5).

Here, the bent portion 136 is not formed in the left and right or horizontal directions along the upper end of the positive electrode 120 , but is bent vertically or vertically along the left end or the right end of the positive electrode uncoated portion 122 , or the positive uncoated portion It may be formed to extend so as to be close to the left and right sides of 122 . The length or shape of the bent portion 136 is preferably such that the left and right ends of the anode uncoated portion 122 are in contact with the bent portion 136 so that the positive uncoated portion 122 does not move left or right. do.

The bent part 136 may prevent the anode 120 from moving to the left or right like the anode position fixing part 132 . That is, it is possible to prevent the positive electrode 120 from moving left or right while the left or right end of the positive electrode uncoated portion 122 collides with the bent portion 136 .

3 and 5 , when the bent portion 136 is on the left and right sides of the positive electrode uncoated portion 122 , the positive electrode uncoated portion 122 or the upper portion of the positive electrode 120 is prevented from moving to the left or right. can As such, the anode position fixing part 132 may be omitted from the insulating member 130 in which the bent parts 136 positioned on the left and right sides of the anode uncoated part 122 are formed. This is because it is possible to prevent the upper portion of the positive electrode uncoated portion 122 or the positive electrode 120 from moving to the left or right by the bent portion 136 . When the anode position fixing part 132 is not provided, the matching part 123 corresponding thereto may also be omitted.

As described above, the first insulating member 131 positioned on the left and right sides of the positive electrode uncoated part 122 is bent and extended along the longitudinal direction of the positive electrode unpainted part 122 or the left end of the positive electrode unpainted part 122 and It may include a bent portion 136 formed to contact the right end.

On the other hand, the second insulating property located at the lower end of the positive electrode 120 , that is, one end of the positive electrode 120 opposite to the positive electrode uncoated portion 122 or one end of the positive electrode 120 where the positive electrode uncoated portion 122 is not formed. The member 133 must include the positive electrode position fixing part 134 , and the mating part 124 , which matches the positive electrode position fixing part 134 , must also be located at one end (lower end) of the positive electrode 120 . If there is no matching portion 124 at the lower end of the positive electrode 120 and the positive electrode position fixing portion 134 matching the second insulating member 133 is not provided, the lower end of the positive electrode 120 moves to the left or right. can't stop moving

In this way, the molded portion 124 is formed only on one end (lower end) of the positive electrode 120 opposite to the positive electrode uncoated portion 122 , and the positive electrode position fixing portion 134 engaged with or mating with the molded portion 124 is the positive electrode. It may be formed only on the edge of the second insulating member 133 facing the one end (lower end) of the positive electrode 120 facing the uncoated region 122 .

However, in the first insulating member 131 positioned at one end (top) of the positive electrode 120 provided with the positive electrode uncoated portion 122 , a bent portion 136 for preventing the left or right movement of the positive electrode uncoated portion 122 . In the absence of , the anode position fixing part 132 should be formed on the first insulating member 131 positioned on the upper end of the anode 120 , and the fitting part 123 should also be formed on the upper end of the cathode 120 .

Fig. 4 (a) is a cross-sectional view taken along the cutting line C-C of Fig. 3, and Fig. 4 (b) is a bottom view viewed from the D direction of Fig. 3 . Referring to FIGS. 4A and 4B , the insulating member 130 is not present on the left and right sides of the positive electrode 120 , and the insulating member 130 is present at the upper or lower ends of the positive electrode 120 . can be found

Hereinafter, a method of manufacturing the pocketing positive electrode body 150 according to an embodiment of the present invention will be described with reference to FIGS. 5 to 8 .

A method of manufacturing the pocketing positive electrode body 150 according to an embodiment of the present invention includes: providing the positive electrode 120; forming an anode accommodating part 139 on the insulating member 130 ; providing a first separation membrane 141; adhering a lower surface of the insulating member 130 to one surface of the first separator 141; disposing the positive electrode 120 in the positive electrode receiving portion 139 of the insulating member 130 ; adhering the upper surface of the insulating member 130 to the second separator 142 so that the second separator 142 covers the anode 120 in a state in which the cathode 120 is disposed in the cathode accommodating part 139; and forming the pocketing anode body 150 by cutting the insulating member 130 and the separators 141 and 142 .

In the step of preparing the positive electrode 120 , 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 or coated on both sides (top and bottom) or either side of the positive electrode current collector 121 . can be 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.

At this time, the positive electrode active material is not applied or coated on the positive electrode uncoated portion 122 . That is, the positive electrode current collector 121 may include the positive electrode uncoated portion 122 to which the positive electrode active material is not applied. As described above, the positive electrode 120 can be obtained by punching the positive electrode 120 from the strip-shaped positive electrode current collector 121 coated with the positive electrode active material.

When the positive electrode 120 is punched out in the step of preparing the positive electrode 120 , molded portions 123 and 124 may be formed at the upper end or lower end of the positive electrode 120 .

In the step of forming the positive electrode receiving part 139 on the insulating member 130 , as shown in FIG. 5 , the insulating member 130 supplied in a band shape has the same or similar shape as the edge of the positive electrode 120 . This is the stage of punching or cutting. As such, the punched or cut out portion corresponds to the positive electrode receiving portion 139 .

At an upper end of the positive electrode accommodating part 139 , the uncoated part accommodating part 135 , in which the positive electrode uncoated part 122 is accommodated, may be integrally formed with the positive electrode accommodating part 139 . Here, when the positive electrode accommodating part 139 and the uncoated part accommodating part 135 are cut out or punched out of the strip-shaped insulating member 130 , the insulating member 130 shown in FIG. 5 is left, and the first insulating member 131 is ) and the second insulating member 133 are originally formed integrally, but as a result of punching or cutting, they are positioned at the upper and lower sides of the anode 120, respectively.

In addition, in the step of forming the positive electrode receiving portion 139 in the insulating member 130 , the positive electrode uncoated portion 122 of the positive electrode 120 is positioned at the upper end of the positive electrode 120 or opposite to the positive uncoated portion 122 . Anode position fixing parts 132 and 134 may be formed at an edge of the anode receiving part 139 adjacent to any one end of the lower end of the anode 120 . That is, when punching the anode accommodating part 139 to the insulating member 130 , the anode position fixing parts 132 and 134 are formed at the top or bottom of the anode accommodating part 139 .

5, in the step of forming the positive electrode receiving portion 139 in the insulating member 130, the insulating member 130 is punched so that there is not much between the adjacent positive electrode receiving portions 139. it is preferable That is, it is preferable to punch the positive electrode accommodating parts 139 adjacent to each other so that the anode accommodating parts 139 are as close to each other as possible. The reason is that the insulating member 130 should not exist on the left and right sides of the positive electrode 120 in the pocketing positive electrode body 150 .

On the other hand, it is preferable to punch the positive electrode accommodating part 139 so that the insulating members 131 and 133 are sufficiently left at the upper end and the lower end of the positive electrode accommodating part 139 .

In addition, in the step of forming the positive electrode accommodating part 139 on the insulating member 130 , the positive electrode accommodating part 139 and The uncoated region receiving part 135 may be punched.

On the other hand, in the step of preparing the positive electrode 120 , the positive electrode is located at either the upper end of the positive electrode 120 where the positive electrode uncoated portion 122 is located or the lower end of the positive electrode 120 opposite to the positive uncolored portion 122 . Mating parts 123 and 124 that match the fixing parts 132 and 134 may be formed.

Here, the positive electrode position fixing parts 132 and 134 and the molded parts 123 and 124 may be formed at one end or an edge facing the positive electrode uncoated part 122 . That is, in the step of preparing the positive electrode 120 , the molded part 124 is formed only at the lower end of the positive electrode 120 , and in the step of forming the positive electrode receiving part 139 in the insulating member 130 , the positive electrode receiving part ( It is preferable to form the anode position fixing part 134 at the lower end of the 139). In this case, the bent portion 136 should be formed at the lower left and lower right sides of the uncoated region accommodating portion 135 .

In the step of preparing the first separator 141 , a band-shaped first separator 141 is supplied, and in the step of bonding the lower surface of the insulating member 130 to one surface of the first separator 141 , the first The punched insulating member 130 shown in FIG. 5 is placed on one surface of the separator 141 and both are adhered to each other.

In the step of disposing the positive electrode 120 in the positive electrode receiving part 139 of the insulating member 130 , as shown in FIG. 7 , the positive electrode receiving part 139 and the uncoated part receiving part ( 139 ) of the insulating member 130 . The positive electrode 120 and the positive electrode uncoated part 122 are disposed on the 135 . In this case, the first separator 141 is positioned on the lower surfaces of the insulating member 130 and the anode 120 .

The step of adhering the upper surface of the insulating member 130 and the second separator 142 so that the second separator 142 covers the anode 120 in a state in which the anode 120 is disposed in the cathode accommodating part 139 is , in a state in which the positive electrode 120 and the positive electrode uncoated portion 122 are placed on the positive electrode receiving portion 139 and the uncoated region receiving portion 135 of the insulating member 130 , the second separator 142 is formed between the insulating member 130 and the insulating member 130 . The second separator 142 is supplied to cover the anode 120 , and the insulating member 130 and the second separator 142 are adhered to each other.

The step of forming the pocketing anode body 150 by cutting the insulating member 130 and the separators 141 and 142 may be performed in the state shown in FIG. 8 .

For ease of understanding, the second separator 1142 is omitted in FIG. 8 . The pocketing anode body 150 is obtained by punching or cutting along the cutting line CL while the second separator 142 is covered.

Referring to FIG. 8 , the cutting line CL is provided along a portion where the insulating member 130 is not present on the left and right sides of the positive electrode 120 , and the insulating member 130 is cut at the upper and lower ends of the positive electrode 120 . may be arranged to do so.

At this time, a cutting line CL is formed at the upper end of the anode 120 so that the first insulating member 131 having the bent part 136 or the anode position fixing part 132 is present, and at the lower end of the anode 120 . The cutting line CL may be formed so that the second insulating member 133 on which the anode position fixing part 134 is formed exists. Here, in the case of the first insulating member 131 , if there is a bent part 136 , the anode position fixing part 132 may be omitted.

In the step of forming the pocketing anode body 150 by cutting the insulating member 130 and the separators 141 and 142 , when the insulating member is cut along the cutting line CL, an insulating member is formed at the left end and the right end of the cathode 120 . The insulating member 130 may be cut so that the 130 does not exist.

In addition, in the step of forming the pocketing anode body 150 by cutting the insulating member 130 and the separators 141 and 142 , when the cutting line CL is cut, the second adjacent to the upper and lower ends of the anode 120 . The first and second insulating members 131 and 133 may cut the insulating member 130 so that the anode position fixing part 132.134 is maintained.

Meanwhile, FIG. 9 is a plan perspective view showing another embodiment of the pocketing anode body shown in FIG. 3 . Referring to FIG. 9A , the positive electrode 220 and the positive electrode uncoated part 222 are accommodated in the positive electrode receiving part (not shown) and the uncoated part receiving part 235 formed in the insulating member 230 , respectively. is shown. A bent portion 236 for limiting movement of the positive electrode uncoated portion 222 in a left or right direction may be formed at the lower left and rear lower ends of the uncoated region receiving portion 235 .

3, in the case of FIG. 9, the mating parts 223 and 224 of the anode 220 are provided in the form of protrusions protruding toward the insulating member 230, and the anode position fixing parts 232 and 234 are the mating parts ( 223,224) may be provided in the form of a concave groove for accommodating.

When the state shown in (a) of FIG. 9 is cut along the same cutting line CL as in FIG. 8 together with the separator 140, the pocketing anode body 250 shown in FIG. 9(b) can be obtained. have. A bent part 236 and a positive electrode position fixing part 232 are formed in the first insulating member 231 positioned at the upper end of the anode 220 , and the second insulating member 233 positioned at the lower end of the anode 220 . Only the anode position fixing part 234 may be formed in the .

When the first insulating member 231 has the bent part 236 , the anode position fixing part 232 may be omitted.

Reference numeral 221 in FIG. 9 denotes a positive electrode current collector.

As described above, the embodiment of the present invention has been described with specific matters such as specific components and limited embodiments and drawings, 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. Accordingly, 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 all equivalents or equivalent modifications thereof will fall within the scope of the spirit of the present invention.

110: electrode assembly 150,250: pocketing anode body
121,221: positive electrode current collector 120,220: positive electrode
122,222: anode uncoated part 123,124,223,224: molded part
130,230: insulating member 131,231: first insulating member
132,134,232,234: positive pole position fixing part
133,233: second insulating member 136,236: bent part
140: separation membrane 141: first separation membrane
142: second separator 150,250: pocketing anode body
160: negative electrode body 161: negative electrode current collector
162: negative electrode uncoated part

Claims (12)

providing an anode;
forming an anode accommodating part in the insulating member;
providing a first separator;
adhering a lower surface of the insulating member to one surface of the first separator;
disposing the positive electrode in the positive electrode receiving portion of the insulating member;
adhering the upper surface of the insulating member and the second separator such that a second separator covers the anode in a state in which the cathode is disposed in the cathode receiving 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.
According to claim 1,
In the step of forming a positive electrode receiving portion on the insulating member,
A pocketing positive electrode body, characterized in that a positive electrode position fixing part is formed at an edge of the positive electrode receiving part adjacent to either one of an upper end of the positive electrode in which the positive electrode uncoated part of the positive electrode is located or a lower end of the positive electrode opposite to the positive electrode uncoated part. manufacturing method.
3. The method of claim 2,
In the step of providing the positive electrode,
A method of manufacturing a pocketing positive electrode body, characterized in that at either one end of the upper end of the positive electrode where the positive electrode uncoated portion is located or the lower end of the positive electrode opposite to the positive electrode uncoated portion, a matching portion for matching with the positive electrode position fixing portion is formed. .
4. The method of claim 3,
The method for manufacturing a pocketing positive electrode body, characterized in that the positive electrode position fixing part and the mold-fitting part are formed at one end or an edge facing the positive electrode uncoated part.
5. The method of claim 4,
In the step of forming a pocketing anode body by cutting the insulating member and the separator,
The method of manufacturing a pocketing positive electrode body, characterized in that the insulating member is cut so that the insulating member is not present at the left and right ends of the positive electrode.
6. The method of claim 5,
In the step of forming a pocketing anode body by cutting the insulating member and the separator,
The method for manufacturing a pocketing positive electrode body, characterized in that the insulating member adjacent to the upper end and the lower end of the anode is cut so that the state in which the anode position fixing part is formed is maintained.
a positive electrode including a positive electrode current collector to which a positive electrode active material is applied or formed, and a positive electrode uncoated portion to which the positive electrode active material is not applied or formed;
an insulating member provided to surround a thickness surface of the positive electrode at an upper end of the positive electrode where the positive electrode uncoated portion is located or at a lower end of the positive electrode facing the positive electrode uncoated portion; and
and first and second separators adhered to the insulating member and covering the upper and lower surfaces of the positive electrode;
The anode is a pocketing anode body, characterized in that even if the insulating member does not exist on the left and right sides of the anode, it is provided between the insulating members and does not move from side to side.
8. The method of claim 7,
A pocketing positive electrode body, characterized in that a positive electrode position fixing unit is formed on an edge or one surface of the insulating member facing either one of the upper end of the positive electrode where the positive electrode uncoated portion is located or the lower end of the positive electrode facing the positive electrode uncoated portion .
9. The method of claim 8,
A pocketing positive electrode body, characterized in that at one end of the upper end of the positive electrode where the positive electrode uncoated portion is located or the lower end of the positive electrode opposite to the positive electrode uncoated portion, a matching portion for matching with the positive electrode position fixing portion is formed.
10. The method of claim 9,
The molded portion is formed only on one end of the positive electrode opposite to the positive electrode uncoated portion, and the positive electrode position fixing portion is formed only on an edge of the insulating member facing the one end of the positive electrode opposite to the positive electrode uncoated portion Pocketing anode.
11. The method of claim 10,
The insulating member positioned on the left and right sides of the positive electrode uncoated part is bent and extended along the longitudinal direction of the positive electrode unpainted part or is formed to contact left and right ends of the positive electrode uncoated part.
12. The method according to any one of claims 7 to 11,
The first and second separators are adhered to the insulating member positioned at the upper end or lower end of the positive electrode;
The pocketing positive electrode body, characterized in that the insulating member does not exist between the first separator and the second separator positioned at left and right ends of the positive electrode.

Images