KR101891864B1 - Apparatus for Shaping Separator and Battery Cell Manufactured by Using the Same - Google Patents

Abstract

The present invention relates to an apparatus for shaping a separation membrane of an electrode assembly in which a plurality of electrodes and separation membranes are stacked in a height direction with respect to a plane,
At least one heating section for melting and shrinking the separator to shape the shape; And
At least one transferring unit for moving the heating unit forward and backward to approach the separation membrane;
The present invention provides a separator shape processing apparatus for a battery cell.

Description

TECHNICAL FIELD [0001] The present invention relates to a separator shape machining apparatus and a battery cell manufactured using the separator shape machining apparatus.

The present invention relates to a separator shape machining apparatus and a battery cell manufactured using the same.

In recent years, the demand for environmentally friendly alternative energy sources has become an indispensable factor for the future, as the increase in the price of energy sources due to depletion of fossil fuels and the interest in environmental pollution are amplified. Various researches on power generation technologies such as nuclear power, solar power, wind power, and tidal power have been continuing, and electric power storage devices for more efficient use of such generated energy have also been attracting much attention.

Particularly, as technology development and demand for mobile devices increase, the demand for batteries as energy sources is rapidly increasing. Recently, the use of secondary batteries as a power source for electric vehicles (EV) and hybrid electric vehicles (HEV) In addition, the use area has been expanded for use as a power auxiliary power source through a grid, and accordingly, a lot of researches on a battery that can meet various demands have been conducted.

Typically, in terms of the shape of a battery, there is a high demand for a prismatic secondary battery and a pouch-type secondary battery which can be applied to products such as mobile phones with a small thickness, and has advantages such as high energy density, discharge voltage, There is a high demand for lithium secondary batteries such as lithium ion batteries and lithium ion polymer batteries.

FIG. 1 schematically shows an exploded perspective view showing a general structure of a typical conventional pouch type secondary battery.

1, a pouch type secondary battery 10 includes a stacked electrode assembly 20 having a plurality of electrode tabs 21 and 22 protruding therefrom, two stacked electrode assemblies 20 and 22 connected to the electrode tabs 21 and 22, And a battery case 40 having a structure in which the stacked electrode assembly 20 is received and sealed such that a part of the electrode leads 30 and 31 and a part of the electrode leads 30 and 31 are exposed to the outside.

The battery case 40 includes a lower case 42 including a concave shaped storage portion 41 on which the stacked electrode assembly 20 can be placed and a stacked electrode assembly 20 And an upper case 43 for sealing the upper case 43. The upper case 43 and the lower case 42 are thermally fused together with the stacked electrode assembly 20 so that the upper end sealing portion 44 and the side sealing portions 45 and 46 and the lower end sealing portion 47 ).

On the other hand, along with the recent miniaturization of mobile devices, consumers are increasingly inclined to prefer products with various designs. Accordingly, products with diversified designs are being released. However, when a battery including a conventional electrode having a uniform shape is applied to a mobile device of a new design, the shape of the battery and the device do not match, and it is difficult to efficiently utilize the internal space of the mobile device. Accordingly, it is required that the battery mounted on the mobile device has various shapes.

In order to manufacture such various shapes of cells, it is necessary to further shape the shapes of existing electrodes or separators, which are the structures of the battery, in consideration of the design of the apparatus. At this time, as a method of processing the shape of the separation membrane, for example, there is a molding method or a laser molding method using a mold cutter.

However, when a plurality of laminated separators are formed by using a mold cutter, steps are easily generated between the formed separators, so that it is difficult to precisely mold and defective. In particular, The phenomenon became even more intense.

Further, when the laser molding method is used to form such a separation membrane, a large number of carbonization is generated in the separation membrane during molding, which may adversely affect the performance of the separation membrane.

Therefore, there is a high need for a technique capable of fundamentally solving such problems.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and the technical problems required from the past.

The inventors of the present application have conducted intensive research and various experiments, and as described later, the separating membrane processing apparatus for a battery cell has at least one heating section for melting and shrinking the separating membrane to form a shape, It is possible to reduce the cost of the apparatus as compared with the molding method or the laser molding method using the conventional metal mold cutter and the step difference between the formed separating membranes is generated when one or more transferring units for forward movement and return to the home position are included And it is possible to perform precise molding, and carbonization of the separator does not occur during molding, so that the risk of reduction in the performance of the battery can be reduced, and the present invention has been accomplished.

In order to achieve the above object, a separation membrane shape processing apparatus for a battery cell according to the present invention comprises:

An apparatus for shaping a separation membrane of an electrode assembly in which a plurality of electrodes and separation membranes are stacked in a height direction with respect to a plane,

At least one heating section for melting and shrinking the separator to shape the shape; And

At least one transferring unit for moving the heating unit forward and backward to approach the separation membrane;

And a control unit.

Accordingly, the separation membrane shape processing apparatus for a battery cell according to the present invention includes at least one heating section for processing the shape of the separation membrane by melting and shrinking the separation membrane, and at least one transfer section for forward movement and returning the heating section to the separation membrane, Compared with the molding method or the laser molding method using a mold cutter, it is possible to reduce the cost of equipment, prevent a step between the molded separators from being generated, enable precise molding, So that the risk of reducing the performance of the battery can be reduced.

In one specific example, the battery cell has an electrode assembly having a structure in which a separator is interposed between an anode and a cathode, and the battery case includes an upper case and a lower case. The upper case and / A battery case including a housing portion for mounting the electrode assembly; And an electrode assembly in which a plurality of electrodes and separation membranes are stacked in a height direction with respect to a plane, and the electrodes and the separation membranes are polygonal in plan view.

In addition, the electrode assembly may include a separating portion that protrudes outwardly in a shape that is inconsistent with the outer shape of the electrode. In particular, the electrode may be hexagonal in plan view, and the separator may be rectangular in plan view. Therefore, the heating section of the separation membrane shape processing apparatus for a battery cell of the present invention can melt-shrink the separation membrane-processed portion such that the separation membrane corresponds to the peripheral shape of the electrode.

In addition, the separation membrane may be a flat polygonal sheet, and more specifically, a rectangular sheet.

In one specific example, the transfer section can move the heating section in a direction that is horizontal with or perpendicular to the plane of the sheet-like separation membrane.

That is, when the heating section is moved in the direction parallel to the plane of the sheet-shaped separator, the conveying section can process the shape of the separator while melting and shrinking the periphery of the sheet-shaped separator. Particularly, Processing can be performed.

Conversely, when the conveying portion is moved in a direction perpendicular to the plane of the sheet-like separating film, the conveying portion can be applied to form a shape on a part of the sheet.

In addition, the heating unit may form the separation membrane using a non-contact method in which the processing region of the separation membrane is indirectly heated while being separated from the separation membrane.

In one specific example, the plurality of electrodes may be a hexagonal structure including first to sixth sides in a plane, and specifically, the first side is a side where electrode tabs are formed, The two sides and the third sides are respectively right and left sides adjacent to the first side and are perpendicular to the first side and the sixth side is located opposite to the first side and parallel to the first side, The second side and the sixth side are connected by an oblique line, and the fifth side may be a structure connecting the third side and the sixth side by an oblique line.

Further, a separation membrane processing portion may be located at a portion corresponding to at least one of the fourth side and the fifth side of the electrode, and the transfer portion may move the heating portion toward the separation membrane processing portion.

On the other hand, the separation membrane is interposed between the anode and the cathode, and an insulating thin film having high ion permeability and mechanical strength can be used. Specifically, the pore diameter of the separation membrane is generally 0.01 to 10 mu m, and the thickness may be generally 5 to 300 mu m. Such separation membranes include, for example, olefinic polymers such as polypropylene, which are chemically resistant and hydrophobic; A sheet or nonwoven fabric made of glass fiber, polyethylene or the like; Kraft paper and the like are used. Representative examples currently on the market include the Celgard ^R 2400, 2300 (from Hoechest Celanese Corp.), polypropylene separator (from Ube Industries Ltd. or Pall RAI), and polyethylene series (from Tonen or Entek).

In one specific example, the heating temperature of the heating section may be 130 to 180 degrees Celsius. Specifically, when the heating temperature of the heating unit is less than 130 degrees Celsius, the separation membrane can be heated to a temperature lower than the melting temperature, so that the molding is delayed in speed and the molding is difficult to uniformly cause defects. Conversely, if the heating temperature of the heating section exceeds 180 degrees Celsius, it may be difficult to control the molding to the intended shape due to excessive heating.

In addition, the moving speed of the transfer part may be 5 mm / s to 40 mm / s.

Specifically, when the moving speed of the conveying unit is less than 5 mm / s, the time required for the separation membrane forming process is increased and the production efficiency is lowered. On the contrary, when the moving speed of the conveying unit exceeds 40 mm / It is likely that the shape adhered to the heating portion is generated, and the portion that has not been melted due to a rapid approach speed is generated, so that the separation membrane may not be processed into an intended shape.

In one specific example, one or more stoppers may be further included to limit the range of movement of the heating section. Specifically, the stopper may be located on the boundary between the separation membrane processing region and the non-processing region to prevent the non-processing region other than the processing region of the separation membrane to be melted and shrunk from being melted and shrunk. More specifically, The boundary between the machining portion and the non-machining portion may be spaced apart from the fourth side or the fifth side of the electrode.

In addition, the stopper may be formed in a structure including an opening through which a processing region of the separation membrane corresponding to the fourth or fifth side of the electrode can be inserted and fixed. In particular, the stopper may be in the form of a square frame made up of square pillars.

In one specific example, the heating unit may include a molding unit that approaches the separation membrane to conduct heat, and the transfer unit may be formed on one side or both sides of the molding unit.

Specifically, the forming unit may be a rectangular plate having a hexagonal shape, and the prismatic plate may have a structure in which a front surface and a rear surface of the prismatic plate are formed to have a wider area than the remaining side surfaces, with reference to a moving direction of the heating unit.

The prismatic plate may have a structure in which a transfer part is coupled to the center of the rear surface, and a plurality of electric heaters and temperature measurement sensors are installed.

In another specific example, the shaping portion may be a cylindrical roll, a rotation shaft is formed at the center of the roll, and a support base is formed on both sides of the rotation shaft to support left and right sides of the rotation shaft Lt; / RTI >

A plurality of electric heaters and temperature measuring sensors may be installed in the inner space between the roll and the rotating shaft.

On the other hand, in the separation membrane shape processing apparatus for a battery cell according to the present invention, when the distribution of heat shrinkage ratio differs at the processing portion of the separation membrane when the separation membrane is processed, or when the heating portion approaches the separation membrane at a relatively high speed, The molten separation membrane may stick to the surface of the molding part.

Therefore, the cylindrical roll can rotate about the central axis of the roll when approaching the separator, and the heating part for rotating the roll may further include a motor. That is, it is possible to prevent the separation membrane melted by the centrifugal force generated by the rotation of the cylindrical roll from adhering to the cylindrical roll.

In one specific example, the transfer part may be in the form of a cylindrical bar, but is not limited thereto, and any structure suitable for effectively transferring the transfer force is applicable.

Further, the forming part may be made of metal, and more specifically, may be stainless steel.

In one specific example, the heating section may further include a protective film added on the surface of the forming section facing the separating membrane to remove foreign matter adhering to the surface of the forming section.

In this case, the protective film may be any material that does not denature at the heating temperature of the heating portion and can not be bonded to the separation film. For example, the protective film may be a polyolefin film, a polyethylene film, a polycarbonate film, have.

In addition, the heating unit may further include a scraper for removing foreign matter adhering to the surface of the molding part. Such a scraper can remove foreign matter adhering to the surface of the forming part while scraping down the surface of the forming part after the forming operation of the separating film is completed.

In addition, the heating unit may further include an air injection device including an air injection nozzle for removing foreign matters adhering to the surface of the molding part. After the forming operation of the separation membrane is completed, the air injection device can remove foreign matter adhering to the surface of the molding part by injecting high-pressure air onto the surface of the molding part.

In one specific example, the battery cell may be a rechargeable lithium secondary battery, which is formed by impregnating and sealing an electrode assembly with an electrolyte embedded in a battery case.

The battery case may be a battery case of a laminate sheet including a resin layer and a metal layer and having flexibility characteristics of a battery that can be easily mounted in devices of various designs, It can be bent or bent.

At this time, the laminate sheet may be an aluminum laminate sheet, more specifically, a resin outer layer having excellent durability is added to one surface (outer surface) of the metal layer, and a thermally fusible resin sealant layer is added to the other surface Structure.

Since the resin outer layer has excellent resistance from the external environment, it is necessary to have a tensile strength and weather resistance of a predetermined level or higher. In this respect, polyethylene terephthalate (PET) and stretched nylon film can be preferably used as the polymer resin of the resin outer layer.

The metal layer may be made of aluminum so as to exhibit a function of improving the strength of the battery case, in addition to a function of preventing foreign matter such as gas and moisture from leaking or leaking.

As the polymer resin of the resin sealant layer, a polyolefin resin having a low heat absorbing property (heat adhesion property) and low hygroscopicity in order to suppress penetration of an electrolyte solution and not being swollen or eroded by an electrolytic solution is preferably used And more particularly, lead-free polypropylene (CPP) may be used.

In general, a polyolefin resin such as polypropylene has a low adhesive force with a metal. Therefore, as a method for improving the adhesion with the metal layer, more specifically, an adhesive layer is additionally provided between the metal layer and the resin sealant layer, The characteristics can be improved. Examples of the material of the adhesive layer include a urethane-based material, an acryl-based material, a composition containing a thermoplastic elastomer, and the like, but are not limited thereto.

The electrode assembly embedded in the cell case, which is embedded in the electrolyte solution in a state of being impregnated with the electrolytic solution, is not particularly limited as long as it is a plate-like structure in which a plurality of electrode tabs are connected to form an anode and a cathode. However, It is preferable that a stacked electrode assembly in which a plurality of positive electrodes and negative electrodes cut in a predetermined size unit are sequentially stacked with a separator interposed therebetween, A stack / folding type electrode assembly in which a Bi-cell or a full cell stacked with a separator interposed therebetween is wound up as a separation film.

At this time, the bi-cell has a stacked structure in which the cells of the same kind are located on both sides, for example, a cell having a stack structure such as a cell comprising a cathode-separator-cathode- separator- anode or cathode- separator- anode- to be. The pull cells have a stacked structure in which different types of electrodes are located on both sides of the cell, and are, for example, cells made of a cathode-separator-cathode.

On the other hand, the present invention also provides a method for shaping a separator for a battery cell using the separator shape processing apparatus for a battery cell.

The method for shaping the separator for a battery cell includes:

(a) activating a heater to heat one or more heating units;

(b) disposing the electrode assembly so that the one or more stoppers are positioned on the boundary between the membrane processing portion and the non-processing portion of the electrode assembly;

(c) advancing the transporting portion so that the forming portion of the heating portion approaches the separation membrane;

(d) melting and shrinking the separator until the heated portion is stopped by the stopper; And

(e) moving the conveying unit backward to return the heating unit to the home position;

And is characterized by comprising:

The present invention also provides a battery cell manufactured by a separation membrane shape processing apparatus for a battery cell, and further provides the battery pack including the battery cell as a unit cell.

The present invention also provides a device including the battery pack as a power source.

The device may be selected from, but not limited to, a mobile phone, a portable computer, a smart phone, a tablet PC, a smart pad, or a netbook in consideration of mounting efficiency and structural stability.

The structure and manufacturing method of such a device are well known in the art, so a detailed description thereof will be omitted herein.

As described above, the separation membrane shape processing apparatus for a battery cell according to the present invention comprises at least one heating unit for processing a shape by melting and shrinking a separation membrane, and at least one transfer unit for advancing and returning the heating unit to the separation membrane It is possible to reduce the cost of the equipment and to prevent the step between the formed separation membranes from being generated as compared with the molding method or the laser molding method using the conventional metal mold cutter, Carbonization of the separator is not generated and the risk of performance degradation of the battery is reduced.

1 is an exploded perspective view showing a general structure of a typical pouch type secondary battery of the related art;
2 is a plan view showing a separator shape forming apparatus for a battery cell and an electrode assembly before and after the process according to an embodiment of the present invention;
3 is a plan view A, a front view B, and a side view C and a front view D of a stopper of a separator shape processing apparatus for a battery cell according to an embodiment of the present invention;
4 is a perspective view of a separator shape processing apparatus for a battery cell according to an embodiment of the present invention;
5 is a plan view showing a separator shape forming apparatus for a battery cell and a battery cell before being processed according to still another embodiment of the present invention;
6 is a plan view showing a scraper of a separator shape processing apparatus for a battery cell according to an embodiment of the present invention;
7 is a plan view showing an air injection device including an air injection nozzle of a separation membrane shape processing apparatus for a battery cell according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

FIG. 2 is a schematic plan view showing a separator shape forming apparatus 100 for a battery cell and an electrode assembly 200 before and after the process according to an embodiment of the present invention. FIG. 3 shows one embodiment A plan view A, a front view B, and a side view C and a front view D of a stopper 130 of the apparatus for processing a shape of a separator for a battery cell 100 according to an example are schematically shown.

2 and 3, a separator shape processing apparatus 100 for a battery cell according to the present invention includes a cathode 221, an anode 211, and a separator 240 stacked in a height direction with respect to a plane And is a device for shaping the separation membrane 240 of the electrode assembly 200.

The separator forming apparatus 100 for a battery cell includes two heating units 110 for processing the shape of the separating film 240 by melting and shrinking the separating film 240 and a plurality of heating units 110 for advancing each heating unit 110 to the separating film 240 And two transferring portions 120 for returning to the home position.

The electrode assembly 200 includes electrodes 211 and 221 and a separator 240 stacked in a height direction with respect to a plane and the electrodes 211 and 221 are formed in a hexagonal shape in plan view. On the other hand, the separator 240 is formed in the shape of a rectangular sheet in plan view.

That is, the separation membrane 240 includes a processing portion 242 having a rectangular shape in plan view and having an outwardly protruding shape inconsistent with the peripheral shape of the electrode.

Therefore, the heating unit 110 of the apparatus for processing a shape of a separator for a battery 100 according to the present invention melts and shrinks a processed portion of the separating film 240 to correspond to the outer shape of the electrode.

In addition, the transfer unit 120 moves the heating unit 110 in a direction that is horizontal with the plane of the sheet-like separation membrane 240.

When the transferring unit 120 moves the heating unit 110 in a direction parallel to the plane of the sheet-like separation membrane 240, the shape of the separation membrane 240 is processed while melting and shrinking the outer periphery of the sheet-like separation membrane 240 , It is possible to perform more precise processing than in the case of forming the edge portion of the separation membrane 240.

Also, the heating unit 110 forms the separation membrane 240 using a non-contact method that indirectly heats the processing region of the separation membrane 240 in a state of being separated from the separation membrane 240.

The electrodes 211 and 221 are formed in a hexagonal shape including a first side to a sixth side 212, 213, 214, 215, 216 and 217 in a plan view, And the second side 213 and the third side 214 are perpendicular to the first side 212 as the left and right sides adjacent to the first side 212 and the sixth side 217, Is located opposite to the first side 212 and parallel to the first side 212 and the fourth side 215 connects the second side 213 and the sixth side 217 with an oblique line And the fifth side 216 connects the third side 214 and the sixth side 217 with diagonal lines.

Separated membrane processing portions 242 and 243 are located at the fourth sides 215 and the fifth sides 216 of the electrode 211. The processing portions 242 and 243 are formed by the transfer portion 120 And is melted and shrunk by moving the heating part 110 toward the separation membrane processing parts 242 and 243.

At this time, the heating temperature of the heating unit 110 is 130 to 180 degrees Celsius, and the moving speed of the transfer unit 120 is 5 to 40 mm / s.

Further, it further includes one or more stoppers 130 for limiting the range of movement of the heating unit 110. The stopper 130 is located in the boundary surface 244 between the separation membrane processing zone 242 and the non-processing zone to prevent the non-processing zone other than the processing zone 242 of the separation membrane 240 to be melted and shrunk from being melted and shrunk And the boundary 242 between the membrane processing portion 242 and the non-processing portion is spaced apart from the fourth side 215 or the fifth side 216 of the electrode.

The stopper 130 is formed with an opening 135 through which the processing portion of the separation membrane 240 corresponding to the fourth side 215 or the fifth side 216 of the electrode can be inserted and fixed. The stopper 130 is in the form of a square frame made up of square pillars.

Fig. 4 schematically shows a perspective view of a separator shape forming apparatus 100 for a battery cell according to an embodiment of the present invention.

4, the heating unit 110 includes a forming unit 112 that conveys heat by approaching the separating film 240, and the transferring unit 120 includes a structure that is coupled to one side of the forming unit 112 Respectively.

The prismatic plate 112 is formed of a square plate having a hexagonal shape and the prismatic plate is formed such that the front surface 113 and the rear surface 114 of the prismatic plate have a larger area As shown in FIG.

The forming portion 112 is made of stainless steel.

In addition, the transfer unit 120 is formed of a cylindrical bar.

A transfer unit 120 is coupled to the center of the rear surface 114 of the rectangular plate and two electric heaters 140 and a temperature measurement sensor 150 are installed.

5 is a plan view showing a separator shape forming apparatus 100 for a battery cell and a battery cell before being processed according to still another embodiment of the present invention.

5, the forming part 410 is formed of a cylindrical roll 412 and a rotating shaft 415 is formed at the center of the roll 412. The rotating shaft 415 is provided with a rotating shaft 415 And support rods 430 for supporting the right and left sides are formed on both sides of the roll 412.

An electric heater (not shown) and a temperature measuring sensor (not shown) are provided in the inner space portion between the roll 410 and the rotating shaft 415.

In addition, the cylindrical roll 410 rotates about the center axis of the roll 410 when approaching the separation membrane 240 by the electric motor 440. That is, the separation membrane 240 melted by the centrifugal force generated by the rotation of the cylindrical roll 410 is prevented from sticking to the cylindrical roll 410.

At this time, the heating unit 410 includes a protective film 460 added on the surface of the forming unit 112 facing the separating film 240.

6 is a plan view showing a scraper 500 of a separator shape forming apparatus 100 for a battery cell according to an embodiment of the present invention.

Referring to FIG. 6, the heating unit 110 further includes a scraper 500 for removing foreign matter adhering to the surface of the forming unit 112. The scraper 500 scrapes the surface of the forming part 112 and removes the adhering foreign material after the forming operation of the separating film (not shown) is completed.

7 is a plan view schematically showing an air injection device 600 including an air injection nozzle of a separation membrane shape processing apparatus for a battery cell 100 according to an embodiment of the present invention.

Referring to FIG. 7, the heating unit 110 further includes an air injection device 600 including an air injection nozzle for removing foreign matter adhering to the surface of the forming part 112. [0064] As shown in FIG. After the forming operation of the separation membrane (not shown) is completed, the air injector 600 injects high-pressure air to the surface of the molding part 112 to remove foreign matter adhering to the surface of the molding part 112.

As described with reference to the drawings, a separator shape processing apparatus for a battery cell according to the present invention includes at least one heating unit for processing a shape by melting and shrinking a separation membrane, and at least one transfer unit for advancing and returning the heating unit to the separation membrane It is possible to reduce the cost of the equipment and to prevent a step between the formed separation membranes from occurring as compared with the molding method or the laser molding method using the conventional metal mold cutter, The separation membrane is not carbonized, thereby reducing the risk of performance degradation of the battery.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (27)

An apparatus for shaping a separation membrane of an electrode assembly in which a plurality of electrodes and separation membranes are stacked in a height direction with respect to a plane,
At least one heating section for melting and shrinking the separator to shape the shape; And
And one or more transferring portions for moving the heating portion forward and backward to approach the separation membrane,
Further comprising at least one stopper for limiting a moving range of the heating unit. The electrode assembly according to claim 1, wherein the electrode assembly includes a separator-processed portion of a shape protruding outwardly from an outer periphery of the electrode, and the heating portion melts and shrinks the separator-processed portion so that the separator corresponds to the outer shape of the electrode Wherein said separating film shape processing device for a battery cell is characterized by comprising: 2. The separation membrane shape processing apparatus for a battery cell according to claim 1, wherein the heating section indirectly heats the processing region of the separation membrane in a state of being separated from the separation membrane. The separation membrane shape processing apparatus for a battery cell according to claim 1, wherein the separation membrane is a rectangular sheet. The separation membrane shape processing apparatus for a battery cell according to claim 4, wherein the transfer section moves the heating section in a direction parallel or perpendicular to a plane of the sheet-like separation membrane. [2] The apparatus of claim 1, wherein the plurality of electrodes are formed in a hexagonal shape including a first side to a sixth side in a plane, the first side is a side where electrode tabs are formed, Wherein the third side is perpendicular to the first side as left and right sides adjacent to the first side, the sixth side is positioned opposite to the first side and parallel to the first side, And the sixth side is connected to the sixth side by an oblique line, and the fifth side connects the third side and the sixth side by an oblique line. The separator for a battery cell according to claim 6, wherein a separation membrane processing portion is located at a portion corresponding to at least one of the fourth side and the fifth side of the electrode, and the transfer portion moves the heating portion toward the separation membrane processing portion Shape processing device. The apparatus for processing a shape of a separation membrane for a battery cell according to claim 1, wherein the heating temperature of the heating unit is 130 to 180 degrees centigrade. The apparatus for processing a shape of a separation membrane for a battery cell according to claim 1, wherein a moving speed of the conveyance unit is 5 mm / s to 40 mm / s. delete The separator for a battery cell according to claim 1, wherein the stopper is located on a boundary between a separating-processed portion and a non-processed portion in order to prevent a non-processed portion other than a processed portion of the separating membrane to be melted and shrunk from being melted and shrunk Shape processing device. 12. The apparatus for processing a shape of a separation membrane for a battery cell according to claim 11, wherein a boundary between the separation membrane processing part and the non-processing part is spaced apart from a fourth side or a fifth side of the electrode. The separation membrane shape processing apparatus for a battery cell according to claim 1, wherein the stopper includes an opening through which a processing portion of a separation membrane corresponding to a fourth side or a fifth side of the electrode can be inserted and fixed. The separation membrane shape processing apparatus for a battery cell according to claim 1, wherein the heating section includes a molding section that approaches the separation membrane and conducts heat, and the transfer section is formed on one side or both sides of the molding section. 15. The method according to claim 14, wherein the shaping portion is a rectangular plate having a hexagonal shape, and the front and rear surfaces of the rectangular plate are formed to have a larger area than the remaining side surfaces of the rectangular plate with respect to the moving direction of the heating portion Device. The apparatus for processing a shape of a separator for a battery cell according to claim 15, wherein a transfer part is coupled to a center of a rear surface of the prismatic plate, and a plurality of electric heaters and a temperature measurement sensor are installed. The separator for a battery cell according to claim 14, wherein the shaping portion is a cylindrical roll, a rotation shaft is formed at the center of the roll, and a support base for supporting right and left sides of the rotation shaft is formed on both sides of the roll Shape processing device. 18. The separation membrane shape processing apparatus for a battery cell according to claim 17, wherein a plurality of electric heaters and temperature measuring sensors are provided in an internal space portion between the roll and the rotating shaft. 18. The separation membrane processing apparatus for a battery cell according to claim 17, wherein the cylindrical roll rotates about a central axis of the roll when approaching the separation membrane. The separation membrane shape processing apparatus for a battery cell according to claim 1, wherein the transfer section is in the form of a cylindrical bar. 15. The separation membrane shape processing apparatus for a battery cell according to claim 14, wherein the heating section further comprises a protective film added on a surface of the molding section facing the separation membrane. 15. The apparatus for processing a shape of a separator for a battery cell according to claim 14, wherein the heating unit further comprises a scraper for removing foreign matters adhering to the surface of the molding part. 15. The apparatus for processing a shape of a separation membrane for a battery cell according to claim 14, wherein the heating unit further comprises an air injection device including an air injection nozzle for removing foreign matter adhering to the surface of the molding part. At least one heating section for melting and shrinking the separator to shape the shape; And at least one transfer unit for moving the heating unit forward and backward to approach the separation membrane, and a plurality of electrodes and separators arranged in a height direction with respect to the plane, the battery assembly comprising: A method for shaping a separation membrane for a battery cell using a separation membrane shape processing apparatus,
(a) activating a heater to heat one or more heating units;
(b) disposing the electrode assembly so that the one or more stoppers are positioned on the boundary between the membrane processing portion and the non-processing portion of the electrode assembly;
(c) advancing the transporting portion so that the forming portion of the heating portion approaches the separation membrane;
(d) melting and shrinking the separator until the heated portion is stopped by the stopper; And
(e) moving the conveying unit backward to return the heating unit to the home position;
Wherein the separating film for a battery cell is formed on a surface of the separator. delete delete delete

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