Secondary battery manufacturing device and secondary battery manufacturing method

Abstract

A secondary battery manufacturing device relating to an embodiment of the present invention is a device configured to fold a separator in a zigzag manner such that different electrode plates are alternately stacked. The secondary battery manufacturing device may comprise: a table; a separator supply device provided to supply the separator to the table and arranged to sequentially repeat a swing operation for unfolding the separator and a folding operation for switching the direction in which the separator is unfolded; a suction plate provided to suction the electrode plate and place the electrode plate onto the table and having an insertion hole recessed inward from an edge portion adjacent to a non-electrode side of the suctioned electrode plate; and a mandrel provided to press and fix the electrode plate covered with the separator by being inserted into the insertion hole after the folding operation of the separator supply device in a state in which the suction plate has placed the electrode plate onto the unfolded separator.

Description

Secondary battery manufacturing apparatus and secondary battery manufacturing method

[0001] The present invention relates to an apparatus for manufacturing a secondary battery and a method for manufacturing a secondary battery, and more specifically, to an apparatus for manufacturing a secondary battery and a method for manufacturing a secondary battery for manufacturing an electrode assembly using a Z-stacking method.

[0002] Rechargeable batteries are batteries that can be charged and discharged. Active research and production of rechargeable batteries are underway due to developments in advanced fields such as digital cameras, cellular phones, laptop computers, hybrid cars, and electric vehicles. Examples of rechargeable batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-hydrogen batteries, and lithium-ion batteries.

[0003] The methods for manufacturing internal cell stacks of such secondary batteries are broadly divided into two types. For small secondary batteries, a commonly used method involves placing the negative and positive plates on a separator and winding them into a jelly-roll form.

[0004] For medium to large-sized secondary batteries, a manufacturing method involving stacking negative plates, positive plates, and separators in an appropriate order is widely used.

[0005] Figure 1 schematically illustrates an electrode assembly fabricated using the Z-stacking method.

[0006] As illustrated in FIG. 1, the Z-stacking method is a method in which the separator (1) is folded in a zigzag shape, and the negative plate (2) and the positive plate (3) are stacked sequentially through the separator (1). In the case of Z-stacking, since the separator (1) is folded in a zigzag shape in a single electrode assembly to maintain continuity, there is an advantage that there is no need to cut the separator (1) or stack the cut separator.

[0007] The conventional Z-stacking method proceeds as follows.

[0008] FIG. 2 is a diagram illustrating the process of manufacturing an electrode assembly using a conventional Z-stacking method, FIG. 3 is a diagram illustrating the process of a mandrel being retracted from an electrode plate after the separator is folded, FIG. 4(a) is a cross-sectional view of a normal electrode assembly (10) in which the separator, the negative plate, the separator, and the positive plate are aligned in the correct position along the longitudinal direction (L) of the electrode plate, FIG. 4(b) is a schematic cross-sectional view of a defective electrode assembly (10) in which the separator (1) is displaced from the correct position along the longitudinal direction (L) of the electrode plate.

[0009] First, as shown in FIG. 2(a), the separator (1) is placed on a table (not shown). Then, one end of the separator (1) is fixed to the table (not shown) by a second mandrel (52).

[0010] Next, as shown in FIG. 2(b), the cathode plate (2) is placed on the separator (1a) while adsorbed to the adsorption plate (30). Then, the first mandrel (51) moves in the longitudinal direction (L) of the electrode plate from a position spaced apart from the table (not shown) and moves in a direction closer to the short side of the adsorption plate (30).

[0011] The first mandrel (51) serves to restrict the movement of the cathode plate (2) when the separator (1b) is folded along the non-electrode boundary of the cathode plate (2) to cover the cathode plate (2).

[0012] The first mandrel (51) is spaced apart from the second mandrel (52) in the width direction (W) of the electrode plate. The first mandrel (51) is a mandrel for fixing the negative electrode plate (2) onto the separator (1), and the second mandrel (52) is a mandrel for fixing the positive electrode plate (3) onto the separator (1).

[0013] FIG. 2(g) is a diagram showing the arrangement of the adsorption plate (30), the first mandrel (51), and a pair of feeding rolls (41, 42) in which the first mandrel (51) shown in FIG. 2(b) enters the adsorption plate (30) to fix the cathode plate (2) onto the separator (1).

[0014] For example, as illustrated in FIG. 2(g), in order to fix the cathode plate (2) onto the separator (1), as the first mandrel (51) moves in a direction (L1) toward the adsorption plate along the length of the electrode plate and enters the adsorption plate (30), the first mandrel (51) may collide with the cathode tab (2a) and cause damage to the cathode tab (2a).

[0015] This may occur when the cathode tab (2a) of the cathode plate (2) is positioned so as to be offset in the direction of entry of the first mandrel (51), and the cathode tab (2a) is located in the entry path of the first mandrel (51).

[0016] FIG. 2(c) is a diagram illustrating the process in which the first mandrel (51) presses the cathode plate (2) against the separator (1) and the adsorption plate (30) returns to its original position, and FIG. 2(g) is a diagram showing the arrangement of the first mandrel (51) and a pair of feeding rolls (41, 42) while the first mandrel (51) is pressing the coating layer (2b) of the cathode plate (2).

[0017] Referring to FIG. 2(c), the conventional first mandrel (51) presses the cathode plate (2) onto the separator (1) while in direct contact with a portion of the coating layer (2b) of the cathode plate (2) adjacent to the cathode tab (2a) of the cathode plate (2).

[0018] Referring to FIG. 2(f), the conventional first mandrel (51) presses the cathode plate (2) onto the separator (1) while in direct contact with the coating layer (2b) of the cathode plate (2), and as a result, the first mandrel (51) may cause damage such as a scratch on the area (C1) in direct contact with the coating layer (2b) of the cathode plate (2).

[0019] Referring to FIGS. 2(d) and FIGS. 2(e), with the first mandrel (51) fixed to the cathode plate (2) on the separator (1), a pair of feeding rolls (41, 42) move away from the first mandrel (51) in the width direction (W) of the electrode plate. At this time, the separator (1) can be folded to cover the cathode plate (2).

[0020] Afterward, before the anode plate (3) is laminated on the cathode plate (2) after the separator (1) is folded to cover the cathode plate (2), as shown in FIG. 3(a), the conventional first mandrel (51) is covered by the separator (1) and can be returned to its original position by retracting in the longitudinal direction (L) of the electrode plate at a position adjacent to the first non-electrode side (2c) and the cathode tab (2a) of the cathode plate. The separator can be folded along the first non-electrode side (2c) of the cathode plate.

[0021] As shown in FIG. 3, the conventional first mandrel (51) retracts in a direction (L2) away from the cathode plate (2) along the length direction (L) of the electrode plate, and at this time, the separator (1) covering the upper surface of the cathode plate (2) can be pulled in the retraction direction (L2).

[0022] Accordingly, as shown in part A of FIG. 4(b), the separator (1) covering the upper surface of the cathode plate (2) moves in the retraction direction (L2) of the first mandrel (51), thereby misaligning the electrode side of the cathode plate (2) and the short side of the separator (1) in the longitudinal direction (L) of the electrode plate. The electrode side of the cathode plate (2) is the part where the cathode tab (2a) of the cathode plate (2) is provided.

[0023] As shown in FIG. 4(a), the normal electrode assembly (10) must have the gap between the short side of the separator (1) and the electrode side of the negative plate (2) and the gap between the short side of the separator (1) and the electrode side of the positive plate (3) aligned evenly in the longitudinal direction (L) of the electrode plate.

[0024] As shown in FIG. 4(b), if the alignment between the electrode side of the cathode plate (2) and the short side of the separator (1) is misaligned, the separator (1) may not be able to partition the entire area of ​​the cathode plate (2) and the anode plate (3), and as shown in part B of FIG. 4(b), the coating layer (2b) of the cathode plate (2) may be electrically contacted with the anode tab (3a) of the anode plate (3).

[0025] If the negative plate (2) and the positive plate (3) are in contact with each other when making a secondary battery, there is a high possibility that short circuits will occur during the charging and discharging of the secondary battery later.

[0026] The present invention was devised to solve problems such as damage to the electrode tab and / or coating layer of the electrode plate that occur when a conventional mandrel fixes the electrode plate onto a separator in a manner where the electrode plate is in direct contact with the coating layer of the electrode plate at the electrode edge of the electrode plate provided with the electrode tab during the process of manufacturing an electrode assembly by a Z-stacking method.

[0027] The present invention aims to provide a secondary battery manufacturing apparatus capable of preventing damage to the electrode tab caused by the mandrel by improving the structure to provide an insertion opening at the edge of the adsorption plate, thereby allowing the mandrel to press the electrode plate together with the separator against the table at a position where it does not interfere with the electrode tab of the electrode plate.

[0028] The present invention aims to provide a secondary battery manufacturing apparatus capable of preventing damage to the coating layer of an electrode plate caused by a mandrel, wherein the mandrel enters the insertion opening in a direction different from the longitudinal direction of the electrode plate while the separator covers the insertion opening of the adsorption plate, and pressurizes the non-electrode side of the electrode plate covered by the separator.

[0029] In addition, the present invention aims to provide an apparatus for manufacturing a secondary battery and a method for manufacturing a secondary battery, wherein the mandrel is configured to retract into the insertion opening of the adsorption plate in a direction different from the longitudinal direction of the electrode plate, thereby enabling the short side of the separator and the electrode side of the electrode plate to be aligned at a constant interval, which is caused by the conventional mandrel pulling the separator in the longitudinal direction of the electrode plate.

[0030] A secondary battery manufacturing device according to one embodiment of the present invention is a device configured to cross-stack different electrode plates by folding a separator in a zigzag manner, and may include a table; a separator supply device configured to supply the separator to the table and configured to sequentially repeat a swinging motion for unfolding the separator and a folding motion for changing the direction in which the separator is unfolded; an adsorption plate configured to adsorb the electrode plate and feed it into the table, having an insertion opening recessed inwardly at a rim portion adjacent to the non-electrode side of the adsorbed electrode plate; and a mandrel configured to be inserted into the insertion opening after the folding motion of the separator supply device while the adsorption plate feeds the electrode plate onto the unfolded separator, and to press and fix the electrode plate covered by the separator.

[0031] The above mandrel can press the non-electrode side of the electrode plate covered by the separator by pressing the separator at the insertion port.

[0032] The above-described membrane supply device includes a pair of feeding rolls arranged to contact both sides of the membrane, and the pair of feeding rolls may be configured to perform the folding operation and the swing operation while moving between both sides of the table.

[0033] The above pair of feeding rolls may be configured to perform the folding operation by moving toward the insertion opening of the adsorption plate at a position spaced apart from the edge of the adsorption plate so that the separator is folded along the edge of the adsorption plate.

[0034] The above pair of feeding rolls may be stopped at a position spaced apart from the upper part of the insertion opening so that the separator membrane is stretched toward the upper part of the adsorption plate.

[0035] The above pair of feeding rolls can perform a swinging motion so that the separator covers the upper surface of the electrode plate as it moves away from the mandrel after the mandrel is inserted into the insertion port.

[0036] The adsorption plate can be operated to release adsorption to the electrode plate and return to its original position before the swinging motion of the pair of feeding rolls.

[0037] The above-mentioned adsorption plate can return to its original position along a path that does not collide with a pair of feeding rolls.

[0038] The electrode plate has an electrode portion having an electrode tab and a non-electrode portion not having the electrode tab, and the adsorption plate may be configured so that the non-electrode portion of the electrode plate is exposed to the outside through the insertion opening.

[0039] The above insertion opening may be provided to be recessed inward from the edge portion of the adsorption plate in the width direction of the electrode plate connecting the two non-electrode sides of the electrode plate.

[0040] The above-described adsorption plate has an adsorption surface provided to adsorb the electrode plate, and the insertion opening may be provided to be open in a height direction perpendicular to the adsorption surface.

[0041] The above insertion opening may be provided to be open in the width direction and the height direction of the electrode plate at the edge portion of the above adsorption plate.

[0042] The above-described adsorption plate may be provided with insertion holes on both edges parallel to the length direction of the electrode plate, so that they are opened in opposite directions in the width direction of the electrode plate.

[0043] The above insertion opening is an opening having a cross-sectional area smaller than the area of ​​the adsorption surface, and may be provided to include a portion of the boundary of the adsorption surface.

[0044] The above insertion opening may be smaller than the width of the adsorption surface in the width direction of the electrode plate and smaller than the length of the adsorption surface in the length direction of the electrode plate perpendicular to the width direction of the electrode plate.

[0045] The above insertion port may be configured to allow the insertion of multiple mandrels.

[0046] The above mandrel is installed adjacent to the table and can be configured to enter and retract into the table in a height direction perpendicular to the floor surface on which the table is placed and in a width direction perpendicular to the height direction of the table.

[0047] The above mandrel can advance from a waiting position spaced apart from the table along the width direction of the table toward the upper part of the insertion opening, and then descend from the upper part of the insertion opening to enter the insertion opening.

[0048] The above mandrel can move up and down in the height direction from the position placed in the insertion opening, and then move backward in the width direction of the table from the top of the insertion opening to return to its original position.

[0049] A secondary battery manufacturing device according to one embodiment of the present invention is a device configured to cross-stack different electrode plates by folding a separator in a zigzag manner, and may include an adsorption plate configured to adsorb the electrode plates and having an insertion opening recessed inwardly at a rim portion adjacent to a non-electrode side of the adsorbed electrode plate, and a mandrel configured to press the electrode plate covered by the separator by being inserted into the insertion opening while the adsorption plate is placed on the expanded separator.

[0050] In addition, a method for manufacturing a secondary battery according to one embodiment of the present invention is a method for cross-stacking different electrode plates by zig-zag folding a separator, and may include the steps of: a pair of feeding rolls performing a swinging motion so that the separator is spread out on the table; a step of a suction plate adsorbing one electrode plate and then placing the electrode plate on the table so that the electrode plate is placed on the separator; a step of the pair of feeding rolls moving toward an insertion opening provided on the edge of the suction plate and performing a folding motion so that the separator is folded along the edge of the suction plate; and a step of a mandrel entering the insertion opening covered by the separator and pressing the separator to press a portion of the non-electrode side of the electrode plate onto the table.

[0051] In addition, the method for manufacturing the secondary battery may include the step of performing the swing operation while the mandrel presses the non-electrode side of the electrode plate covered with the separator.

[0052] The above pair of feeding rolls can repeatedly perform the swing motion and the folding motion along a first direction from one side of the table to the other and a second direction opposite to the first direction, so that the separator can be folded in a zigzag pattern.

[0053] The above mandrel may include a first mandrel installed spaced apart from one side of the table and configured to press the first non-electrode side of the electrode plate covered with the separator in conjunction with the folding operation of the pair of feeding rolls in the first direction, and a second mandrel installed spaced apart from the first mandrel on the other side of the table parallel to the first mandrel and configured to press the second non-electrode side of the electrode plate covered with the separator in conjunction with the folding operation of the pair of feeding rolls in the second direction.

[0054] When either of the first mandrel and the second mandrel is operated to press the non-electrode side of the electrode plate, the other mandrel may wait at a position spaced apart from the table.

[0055] A secondary battery manufacturing device having the configuration and structure as described above can have the following effects.

[0056] The present invention can prevent damage to the electrode tab caused by the mandrel by improving the structure to provide an insertion opening at the edge of the adsorption plate, thereby allowing the mandrel to press the electrode plate together with the separator against the table at a position where it does not interfere with the electrode tab of the electrode plate.

[0057] The above-described adsorption plate is configured such that a portion of the area including the non-electrode side of the electrode plate can be exposed to the insertion opening. Furthermore, the mandrel can enter the insertion opening of the adsorption plate in a direction different from the longitudinal direction of the electrode plate while the insertion opening is covered by the separator, thereby pressurizing the non-electrode side of the electrode plate. Accordingly, damage to the electrode tab caused by the mandrel colliding with the electrode tab during the process in which a conventional mandrel pressurizes the coating layer of the electrode plate in the longitudinal direction at a position adjacent to the electrode tab of the electrode plate can be prevented.

[0058] Furthermore, the mandrel of the present invention does not come into direct contact with the coating layer of the electrode plate by applying pressure to a portion including the non-electrode side of the electrode plate located at the insertion opening while the separator covers the insertion opening of the adsorption plate. Accordingly, damage to the coating layer of the electrode plate caused by direct contact with the mandrel can be prevented. In addition, since the separator and the electrode plate are pressed together, the bonding strength between the separator and the electrode plate can be increased.

[0059] That is, the present invention can fix the non-electrode side of the electrode plate in a state where the mandrel is in non-contact with the coating layer of the electrode plate through the separator, thereby preventing damage to the coating layer of the electrode plate caused by the mandrel.

[0060] In addition, the present invention is configured such that the mandrel can retract into the insertion opening of the adsorption plate in a direction different from the longitudinal direction of the electrode plate, thereby preventing conventional problems that may occur when the negative and positive plates come into direct contact as the conventional mandrel pulls the separator in the longitudinal direction of the electrode plate, such as the risk of a short circuit in a secondary battery due to direct contact between the positive and negative plates.

[0061] Figure 1 schematically illustrates an electrode assembly fabricated using the Z-stacking method.

[0062] Figure 2 is a diagram illustrating the process of manufacturing an electrode assembly using a conventional Z-stacking method.

[0063] Figure 3 is a diagram illustrating the process in which a mandrel is retracted from the electrode plate after the conventional separator is folded.

[0064] FIG. 4(a) is a cross-sectional view of a normal electrode assembly in which the separator, cathode plate, separator, and anode plate are aligned in the longitudinal direction of the electrode plate, and FIG. 4(b) is a schematic cross-sectional view of a defective electrode assembly in which the separator is displaced from the longitudinal direction of the electrode plate.

[0065] FIG. 5 schematically illustrates a configuration diagram of a secondary battery manufacturing apparatus according to one embodiment of the present invention.

[0066] FIG. 6 schematically illustrates a rear view of an adsorption plate according to one embodiment of the present invention.

[0067] FIG. 7 schematically illustrates the arrangement of an adsorption plate and a mandrel according to another example of the present invention.

[0068] FIG. 8 schematically illustrates the arrangement of an adsorption plate and a mandrel according to another example of the present invention.

[0069] FIG. 9 is a flowchart of a method for manufacturing a secondary battery according to one embodiment of the present invention.

[0070] FIGS. 10 to 18 schematically illustrate the operating state diagram of a secondary battery manufacturing apparatus according to a method for manufacturing a secondary battery according to one embodiment of the present invention.

[0071] Hereinafter, a secondary battery manufacturing apparatus according to one embodiment of the present invention will be described with reference to the attached drawings.

[0072] FIG. 1 schematically illustrates an electrode assembly manufactured by a Z-stacking method, FIG. 4(a) is a cross-sectional view of a normal electrode assembly in which a separator, a negative electrode plate, a separator, and a positive electrode plate are aligned in a fixed position along the length direction of the electrode plate, FIG. 5 schematically illustrates a configuration diagram of a secondary battery manufacturing apparatus according to an embodiment of the present invention, and FIG. 10 to 17 schematically illustrate an operating state diagram of a secondary battery manufacturing apparatus according to a secondary battery manufacturing method according to an embodiment of the present invention.

[0073] The secondary battery manufacturing apparatus (100) of the present invention is for manufacturing an electrode assembly by folding a separator in a zigzag pattern using a Z-stacking method and cross-stacking different electrode plates between the separators.

[0074] The above secondary battery manufacturing device (100) is devised to solve problems such as damage to the electrode tab (2a) and / or coating layer (2b) of the electrode plate (e.g., 2) and short circuit of the secondary battery caused by the misalignment of the separator (1) and the contact between the different electrode plates (2, 3) due to misalignment of the separator (1), which occur when the mandrel (121) fixes the electrode plate (e.g., 2) on the separator (1) in a manner of direct contact with the coating layer (e.g., 2b) of the electrode plate at the electrode edge of the electrode plate (e.g., 2) that has an electrode tab, during the process of cross-stacking different electrode plates (2, 3) while zig-zag folding the separator (1).

[0075] The above electrode plate (e.g., 2) includes a coating layer coated with an electrode active material and an electrode tab (e.g., 2a) not coated with the electrode active material. The above electrode plate (e.g., 2) may have an electrode side provided with an electrode tab (e.g., 2a) and a non-electrode side (2c, 2d) not provided with the electrode tab.

[0076] In this embodiment, for convenience of explanation, the different electrode plates (2, 3) are referred to as the first electrode plate (2) and the second electrode plate (3).

[0077] The first electrode plate (2) may be a negative electrode plate. The first electrode plate (2) has a negative electrode coating layer (2b) and a negative electrode tab (2a). The second electrode plate (3) may be an positive electrode plate. The second electrode plate (3) has a positive electrode coating layer (3b) and a positive electrode tab (3a).

[0078] Referring to FIGS. 1 and FIGS. 4, the electrode assembly (10) is formed by the first electrode plate (2) and the second electrode plate (3) being alternately stacked through the separator (1).

[0079] As illustrated in FIG. 5, a secondary battery manufacturing apparatus (100) related to one embodiment of the present invention is a device configured to fold a separator (1) in a zigzag manner so that different electrode plates (2, 3) are stacked in an alternating manner, comprising: a table (190); a separator supply device configured to supply the separator (1) to the table (190) and configured to sequentially repeat a swinging motion for unfolding the separator (1) and a folding motion for changing the direction in which the separator (1) is unfolded; an adsorption plate (110) configured to adsorb the electrode plate (e.g., 2) and feed it into the table (190), and having an insertion opening (e.g., 111) that is recessed inwardly at a rim portion (e.g., 117) adjacent to a non-electrode side (e.g., 2c) of the adsorbed electrode plate; and the separator supply device in a state where the adsorption plate (110) feeds the electrode plate (e.g., 2) onto the unfolded separator (1). It may include a mandrel (e.g., 121) provided to press and fix an electrode plate (e.g., 2) covered with the separator (1) after the folding operation by being inserted into the insertion port (e.g., 111).

[0080] The secondary battery manufacturing apparatus (100) of the present invention may include a pickup unit (SR) including an adsorption plate (110), a first mandrel unit (120) including the first mandrel (121), a second mandrel unit (130) including the second mandrel (131), a pair of feeding rolls (141, 142), a controller (180), and a table (190).

[0081] The above pickup unit (SR) may include the adsorption plate (110) and the vacuum pressure supply pipe (119). The vacuum pressure supply pipe (119) is a pipe for supplying vacuum pressure (P0) to the adsorption plate (110).

[0082] The above pickup unit (SR) is configured to adsorb the electrode plate (e.g., 2) through the adsorption plate (110) and transport it to the table (190). The above pickup unit (SR) may be a SCARA robot equipped with the adsorption plate (110). Multiple pickup units (SR) may be configured to transport different electrode plates (2, 3) separately to the table (190).

[0083] The adsorption plate (110) according to the present embodiment has an insertion opening (111, 112) into which a mandrel (121 or 131) is inserted, provided on both edge portions (117, 118), so that the mandrel (121 or 131) can press the electrode plate (2 or 3) at a position where it does not interfere with the electrode tab (2a or 3a).

[0084] FIG. 6 schematically illustrates a rear view of an adsorption plate according to one embodiment of the present invention, FIG. 7 schematically illustrates an arrangement state diagram of an adsorption plate and a mandrel according to another example of the present invention, and FIG. 8 schematically illustrates an arrangement state diagram of an adsorption plate and a mandrel according to yet another example of the present invention.

[0085] Below, the structure of the adsorption plate (110) will be described.

[0086] As illustrated in FIG. 5, the adsorption plate (110) is configured so that the mandrel (121 or 131) can enter the edge portion (117 or 118) of the adsorption plate (110).

[0087] The edge portions (117, 118) of the adsorption plate (110) may be parallel to the longitudinal direction (L) of the electrode plate. The longitudinal direction (L) of the electrode plate is a direction parallel to the non-electrode side of the electrode plate (2).

[0088] The above adsorption plate (110) may be configured so that the non-electrode portion (e.g., 2c) of the electrode plate is exposed to the outside through the insertion opening (e.g., 111).

[0089] As illustrated in FIG. 6, the adsorption plate (110) is provided with an adsorption surface (113) having a plurality of vacuum holes (114). The adsorption surface (113) is provided on the lower surface of the adsorption plate (110). The adsorption surface (113) can be provided to be in surface contact with the electrode plate (e.g., 2).

[0090] The above-mentioned adsorption plate (110) may be provided with a pair of insertion holes (111, 112) on both side edge portions (117, 118) parallel to the length direction of the electrode plate (e.g., 2), which are opened in opposite directions in the width direction (W) of the electrode plate.

[0091] The above insertion openings (111, 112) may be formed to be recessed into the inner side of the edge portions (117, 118) of the adsorption surface (113) in the width direction (W) of the electrode plate connecting the non-electrode side of the electrode plate (2).

[0092] One insertion opening (e.g., 111) may be formed to be recessed inward from the edge portion (e.g., 117) of the adsorption plate (110) in the width direction (W) of the electrode plate connecting the two non-electrode sides (2c, 2d) of the electrode plate (e.g., 2). Additionally, another insertion opening (e.g., 112) may be formed to be recessed inward from the edge portion (e.g., 118) of the adsorption plate (110) in the width direction (W) of the electrode plate.

[0093] The above insertion opening (e.g., 111, 112) may be provided to be open in the width direction (W) and the height direction (H) of the electrode plate at the edge portion (e.g., 117, 118) of the adsorption plate (110).

[0094] The above insertion opening (e.g., 111) is an opening having a cross-sectional area smaller than the area of ​​the adsorption surface (113) and may be provided to include a portion of the boundary of the adsorption surface (113). The above insertion opening (e.g., 111) may be provided to be smaller than the width of the adsorption surface (113) in the width direction (W) of the electrode plate and smaller than the length of the adsorption surface (113) in the length direction (L) of the electrode plate (e.g., 2) perpendicular to the width direction (W) of the electrode plate.

[0095] In this document, the first insertion port (111) and the second insertion port (112) are distinguished and referred to according to the position of the insertion ports (111, 112).

[0096] The first insertion opening (111) and the second insertion opening (112) may be provided to be open in opposite directions in the width direction (W) of the adsorption plate. The first insertion opening (111) and the second insertion opening (112) may be provided symmetrically in the width direction (W) of the adsorption plate. The first insertion opening (111) and the second insertion opening (112) may be provided parallel to each other on both edge portions (117, 118) of the adsorption plate (110).

[0097] The first insertion opening (111) is an opening formed by perforating a portion of the first edge portion (117) of the adsorption plate (110). The first insertion opening (111) is an opening into which a first mandrel (121) is inserted. The first insertion opening (111) is an opening having a cross-sectional area larger than the cross-sectional area of ​​the first mandrel (121). The first insertion opening (111) may be configured to allow multiple first mandrels (121) to be inserted.

[0098] The second insertion opening (112) is an opening formed by perforating a portion of the second edge portion (118) of the adsorption plate (110). The second insertion opening (112) is an opening into which a second mandrel (131) is inserted. The second insertion opening (112) is an opening having a cross-sectional area larger than that of the second mandrel (131). The second insertion opening (112) may be configured to allow multiple second mandrels (131) to be inserted.

[0099] For example, as shown in FIGS. 5 to 7, the first insertion port (111) and the second insertion port (112) may each be provided on the adsorption plate (110, 110a).

[0100] As illustrated in FIG. 8, in an adsorption plate (110b) according to another example, the first insertion holes (111) are provided in a plurality on the first edge portion (117) of the adsorption plate (110), and the second insertion holes (112) may be provided on the second edge portion (118) of the adsorption plate (110) symmetrically with respect to each of the first insertion holes (111).

[0101] As illustrated in FIG. 5, the mandrel portion (120) may include a mandrel (121) provided to be insertable into the insertion opening (111) of the adsorption plate (110) and a position adjustment portion (124) provided to adjust the position of the mandrel (121).

[0102] In this document, the at least one mandrel part (120, 130) is referred to as a first mandrel part (120) and a second mandrel part (130) depending on the installation location.

[0103] The first mandrel part (120) is installed on one side of the table (190). The second mandrel part (130) may be installed on the other side of the table (190) at a distance parallel to the first mandrel part (120).

[0104] The first mandrel part (120) may include a first mandrel (121) and a first position adjustment part (124).

[0105] The first mandrel (121) can be mounted on the first position adjustment part (124). The first mandrel (121) can be provided to be insertable into the first insertion opening (111).

[0106] The first mandrel (121) can advance along the width direction (W) of the table (190) toward the upper part of the first insertion opening (111) from a standby position spaced apart from the table (190), and then descend from the upper part of the first insertion opening (111) to enter the first insertion opening (111).

[0107] The first mandrel (121) can move up and down in the height direction (H) from the position where it is placed in the first insertion opening (111), and then move backward in the width direction (W) of the table (190) from the top of the first insertion opening (111) to return to its original position.

[0108] The first mandrel (121) may be provided to press the first non-electrode side (2c) of the first electrode plate (2) when the separator (1) is folded along the first non-electrode side (2c) of the first electrode plate (2).

[0109] As shown in FIG. 5, the first mandrel (121) can be provided to be able to enter a first insertion hole (111).

[0110] As shown in FIG. 7, a plurality of first mandrels (121) may be arranged to be able to enter the first insertion opening (111) of the adsorption plate (110a) according to another example at different positions spaced apart in the longitudinal direction (L) of the electrode plate.

[0111] As another example, as shown in FIG. 8, a plurality of first mandrels (121) may be provided to be able to enter each of the first insertion holes (111) of the adsorption plate (110b) provided according to another example.

[0112] The first position adjustment unit (124) may be configured so that the first mandrel (121) can enter and retract into the table (190) in the height direction (H) and the width direction (W) of the table (190). The first position adjustment unit (124) may include a first forward / backward movement unit (125) and a first lifting unit (127).

[0113] The first lifting unit (127) is for adjusting the position of the first mandrel (121) in the height direction (H). The first lifting unit (127) may use a driving source such as a linear motor or a reciprocating cylinder.

[0114] The first forward and backward moving part (125) is mounted on the first lifting part (127). The first mandrel (121) may be mounted on the first forward and backward moving part (125). The first forward and backward moving part (125) may be configured to move the first mandrel (121) in the width direction (W) of the electrode plate. A driving source such as a linear motor or a reciprocating cylinder may be used for the first forward and backward moving part (125).

[0115] The first mandrel portion (120) can be operated so that the first mandrel (121) enters the first insertion opening (111) while the first insertion opening (111) is covered by the separator (1) and presses a portion of the first non-electrode portion (2c) of the first electrode plate (2) covered by the separator (1b).

[0116] The second mandrel section (130) may include a second mandrel (131) and a second position adjustment section (134). The second position adjustment section (134) may include a second forward / backward movement section (135) and a second lifting section (137). The second mandrel section (130) has the same structure and operation method as the first mandrel section (120).

[0117] The second mandrel (121) can advance along the width direction (W) of the table (190) toward the upper part of the second insertion opening (111) from a standby position spaced apart from the table (190), and then descend from the upper part of the second insertion opening (111) to enter the second insertion opening (111).

[0118] The second mandrel (121) can move up and down in the height direction (H) from the position where it is placed in the second insertion opening (111), and then move backward in the width direction (W) of the table (190) from the top of the second insertion opening (111) to return to its original position.

[0119] The second mandrel (131) may be provided to press the second non-electrode side (3d) of the second electrode plate (3) when the second electrode plate (3) is laminated onto the first electrode plate (2) covered with the separator (1) and then the separator (1) is folded along the second non-electrode side (3d) of the second electrode plate (3).

[0120] The above pair of feeding rolls (141, 142) may be arranged to reciprocate on both sides of the table (190) in the width direction (W) of the table while holding both sides of the separator (1). The width direction (W) of the table may be a direction parallel to the width direction of the electrode plate when the electrode plate (2) is placed on the table (190).

[0121] A pair of feeding rolls (141, 142) may be provided to adjust the position of the separator (1) in the height direction (H) perpendicular to the bottom surface and the width direction (W) of the table (190) so that the separator (1) is zigzag folded along the first non-electrode side (2c) of the first electrode plate (2) and the second non-electrode side (3d) of the second electrode plate (3).

[0122] The above pair of feeding rolls (141, 142) can move in a direction closer to the first insertion opening (111) from the first edge portion (117) of the adsorption plate (110), thereby causing the separator (1) to be folded along the edge portion (117) of the adsorption plate (110).

[0123] The above pair of feeding rolls (141, 142) may be stopped at a first position (P1) spaced apart from the upper part of the first insertion opening (111) so that the separator (1) is stretched to the upper part of the adsorption plate (110).

[0124] The above pair of feeding rolls (141, 142) can move away from the first mandrel (121) while the first mandrel (121) is pressing the non-electrode side (2c) of the first electrode plate (2) so that the separator (1) covers the upper surface of the first electrode plate (2).

[0125] The above separator (1) can be zigzag folded along the boundary between the first non-electrode side (2c) of the first electrode plate (2) and the second non-electrode side (3d) of the second electrode plate (3) through the above pair of feeding rolls (141, 142).

[0126] The controller (180) may be configured to individually control the operation of the pickup unit (SR), the pair of feeding rolls (141, 142), and the at least one mandrel unit (120, 130) so that the separator (1) is zigzag folded along the boundary of the first non-electrode side (2c) of the first electrode plate (2) and the second non-electrode side (3d) of the second electrode plate (3).

[0127] Hereinafter, with reference to FIGS. 9 to 18, a method for manufacturing a secondary battery related to an embodiment of the present invention will be described.

[0128] FIG. 9 is a flowchart of a method for manufacturing a secondary battery according to one embodiment of the present invention, and FIGS. 10 to 18 schematically illustrate the operating state diagram of a secondary battery manufacturing apparatus (100) according to a method for manufacturing a secondary battery according to one embodiment of the present invention.

[0129] A method for manufacturing a secondary battery according to an embodiment of the present invention is a method for cross-stacking different electrode plates (2, 3) by zig-zag folding a separator (1), comprising: a step (S1) in which a pair of feeding rolls (141, 142) perform a swinging motion so that the separator (1) is spread out on the table (190); a step (S2) in which an adsorption plate (110) adsorbs one electrode plate (e.g., 2) and the electrode plate (e.g., 2) is placed on the separator (1); and a step (S3) in which the pair of feeding rolls (141, 142) move toward an insertion opening (e.g., 111) provided on the edge portion (e.g., 117) of the adsorption plate (110) so that the separator (1) is folded along the edge portion (e.g., 117) of the adsorption plate (110). The method may include a step (S4) in which a mandrel (e.g., 121) enters the insertion port (e.g., 111) covered by the separator (1) and presses the separator (1) to press a portion of the non-electrode side (e.g., 2c) of the electrode plate onto the table (190); and a step (S5) in which, while the mandrel (e.g., 121) presses the non-electrode side (e.g., 2c) of the electrode plate covered by the separator (1), the pair of feeding rolls (141, 142) move away from the mandrel (e.g., 121) to perform the swing operation so that the separator (1) covers the upper surface of the electrode plate (e.g., 2) while the pair of feeding rolls (141, 142) move away from the mandrel (e.g., 121).

[0130] The above pair of feeding rolls (141, 142) can repeat the swinging motion and the folding motion along a first direction (W1) from one side of the table (190) toward the other side and a second direction (W2) opposite to the first direction (W1), so that the separator (1) can be folded in a zigzag pattern.

[0131] In the above S1 step, the separator (1) is supplied to the table (190) through the pair of feeding rolls (141, 142) and can be placed on the table (190). The end of the separator (1) can be fixed to the table (190) by the second mandrel (131). At this time, the pair of feeding rolls (141, 142) are positioned spaced apart from one side of the table (190) opposite the second mandrel (131).

[0132] As shown in FIG. 10, the adsorption plate (110) can be placed on the table (190) so that the first electrode plate (2) is placed on the separator (1) while adsorbing the first electrode plate (2) (S2).

[0133] Referring to FIG. 11, in step S2, the lower surface of the first electrode plate (2) is placed on the separator (1). The upper surface of the first electrode plate (2) is adsorbed to the adsorption plate (110), and a portion of the first electrode plate (2) is exposed to the first insertion port (111) and the second insertion port (112).

[0134] In the above S2 step, the first mandrel (121) waits at a waiting position spaced apart from the first edge portion (117) of the adsorption plate (110) on one side of the table (190). And, a pair of feeding rolls (141, 142) are positioned spaced apart from the first edge portion (117) of the adsorption plate (110).

[0135] Referring to FIG. 12, the pair of feeding rolls (141, 142) can perform a folding operation so that the separator (1) is folded along the first edge portion (117) of the adsorption plate (110) while moving toward the first insertion opening (111) provided in the first edge portion (117) of the adsorption plate (110) in the first direction (W1) (S3).

[0136] Referring to FIGS. 12 and 13, the pair of feeding rolls (141, 142) can be moved to a first position (P1) where the separator (1) covers the first insertion opening (111) of the adsorption plate (110). Then, in step S3, the pair of feeding rolls (141, 142) can be stopped at the first position (P1).

[0137] In the above S3 step, the separator (1) is moved by a pair of feeding rolls (141, 142) to cover the first insertion opening (111) at the first edge portion (117) of the adsorption plate (110).

[0138] Referring to FIG. 13, the first mandrel (121) can enter the first insertion port (111) covered by the separator (1) and press the separator (1) to press a portion of the non-electrode side (e.g., 2c) of the electrode plate onto the table (190) (S4).

[0139] In the above S4 step, the first mandrel (121) can press the first non-electrode side (2c) of the first electrode plate (2) covered with the separator (1) in conjunction with the folding operation of the pair of feeding rolls (141, 142) in the first direction (W1).

[0140] Specifically, the first mandrel (121) moves forward in the first direction (W1) toward the first edge portion (117) of the adsorption plate (110) from a standby position spaced apart from the first edge portion (117) of the adsorption plate (110) by the first front and rear moving part (125).

[0141] Next, the first mandrel (121) enters the first insertion opening (111) by descending in the height direction (H) from the upper part of the first insertion opening (111) of the adsorption plate (110). The first mandrel (121) can press a portion of the first non-electrode side (2c) of the first electrode plate (2) covered with the separator (1b) against the table (190).

[0142] In the above S4 step, the first mandrel (121) can fix the first electrode plate (2) to the table (190) together with the separator (1) in a state where it does not come into direct contact with the coating layer (2b) of the first electrode plate (2) through the separator (1), thereby preventing damage to the coating layer (2b) of the first electrode plate (2) caused by the first mandrel (121).

[0143] Additionally, the first mandrel (121) is provided to be able to enter and retract into the insertion opening (111, 112) from the edge portion (117, 118) of the adsorption plate (110), thereby preventing damage to the electrode tab (2a) caused by the mandrel (51, see FIG. 2(f)) hitting the electrode tab (2a) at a position adjacent to the electrode tab of the electrode plate (e.g., 2) in the longitudinal direction (L) of the electrode plate.

[0144] Before step S5, while the first mandrel (121) is pressing the first non-electrode side (2c) of the first electrode plate (2), the adsorption plate (110) can release the adsorption of the first electrode plate (2) and return to its original position. The adsorption plate (110) can return to its original position along a path that does not collide with a pair of feeding rolls (141, 142).

[0145] Referring to FIGS. 14 and 15, while the first mandrel (121) is pressing the first non-electrode side (2c) of the first electrode plate (2), the pair of feeding rolls (141, 142) can perform the swing operation so that the separator (1) covers the upper surface of the electrode plate (e.g., 2) while moving away from the mandrel (e.g., 121) (S5).

[0146] After the first electrode plate (2) is laminated on the separator (1a) of the table (190), the process of laminating the second electrode plate (3) onto the first electrode plate (2) via the separator (1) can be carried out.

[0147] As shown in FIG. 16, the adsorption plate (110) adsorbs the second electrode plate (3) and transports it to the table (190).

[0148] At this time, the first mandrel (121) is in a state of pressing a portion of the first non-electrode side (2c) of the first electrode plate (2) covered with the separator (1b), and the second mandrel (131) is in a state of being spaced apart from the second non-electrode side (2d) of the first electrode plate (2).

[0149] As illustrated in FIG. 17, with the separator (1) covering the upper surface of the first electrode plate (2), the second electrode plate (3) can be stacked on the first electrode plate (2) while adsorbed to the adsorption plate (110). The first mandrel (121) can be raised to the upper part of the first insertion opening (111) and then returned to its original position.

[0150] The first mandrel (121) can ascend to the top of the table (190) and then retract in the second direction (W2) to return to its original position, which is spaced apart from the table (190). That is, when the adsorption plate (110) on which the second electrode plate (3) is adsorbed enters the table (190), the first mandrel (121) can ascend to the top of the table (190) along the first path from the first position (P1) and then move in a direction away from the first position (P1) to return to its original position.

[0151] As illustrated in FIG. 18, the separator (1) can be folded by the pair of feeding rolls (141, 142) to cover the second insertion opening (112) at the second edge portion (118) of the adsorption plate (110).

[0152] The above pair of feeding rolls (141, 142) can move from the upper part of the adsorption plate (110) placed on the table (190) in a second direction (W2) toward the first edge portion from the second edge portion (118) of the adsorption plate (110) to a second position (P2) where the separator (1) covers the second insertion opening (112) of the adsorption plate (110). Then, the above pair of feeding rolls (141, 142) can stop at the second position (P2).

[0153] The second mandrel (131) can press the second non-electrode side (3d) of the second electrode plate (2) covered with the separator (1) in conjunction with the folding operation of the pair of feeding rolls (141, 142) in the second direction (W2).

[0154] The second mandrel (131) moves forward in the second direction (W2) toward the second edge portion (118) of the adsorption plate (110) from a standby position spaced apart from the second edge portion (118) of the adsorption plate (110) by the second front and rear moving part (135).

[0155] And, the second mandrel (131) enters the second insertion opening (112) by descending in the height direction (H) from the upper part of the second insertion opening (112) of the adsorption plate (110). And, the second mandrel (131) can press a portion of the second non-electrode side (3d) of the second electrode plate (3) covered with the separator (1b) against the table (190).

[0156] Next, while the second mandrel (131) is pressing a portion of the second non-electrode side (3d) of the second electrode plate (3) covered by the separator (1b) at the second position (P2), the adsorption plate (110) can release the adsorption to the second electrode plate (3) and return to its original position. The adsorption plate (110) can return to its original position along a path that does not collide with a pair of feeding rolls (141, 142) at the second position (P2).

[0157] With the second mandrel (131) pressing the second non-electrode side (3d) of the second electrode plate (3), the separator (1) can be folded to cover the second upper surface by the pair of feeding rolls (141, 142).

[0158] The above separator (1) is folded along the second non-electrode side (3d) of the second electrode plate (3) by the above pair of feeding rolls (141, 142) and moved toward the first non-electrode side (3c) of the second electrode plate (3) to cover the upper surface of the second electrode plate (3).

[0159] When the adsorption plate (110) on which the first electrode plate (2) is adsorbed enters the table (190), the second mandrel (131) can move up from the second position (P2) to the top of the table (190) and then move away from the second position (P2) to return to its original position.

[0160] Through the above process, the first electrode plate (2) and the second electrode plate (3) can be cross-stacked via the separator (1).

[0161] Through the above process, the present invention can produce an electrode assembly (10) in which a separator (1), a first electrode plate (2), and a second electrode plate (3) are stacked sequentially in the correct positions as shown in FIG. 4(a).

[0162] The first mandrel (121) and the second mandrel (131) according to the present invention can be retracted in a direction different from the longitudinal direction (L) of the electrode plate during the process of folding the separator (1), thereby allowing the short side of the separator (1) and the electrode side of the electrode plate (e.g., 2) to be aligned at a constant interval.

[0163] That is, unlike conventional mandrels (51, 52, see FIG. 2), the first mandrel (121) and the second mandrel (131) according to the present invention do not pull the separator (1) in the longitudinal direction (L) of the electrode plate, thereby preventing the separator (1) from moving out of position in the longitudinal direction (L) of the electrode plate.

[0164] Accordingly, the present invention is configured such that the mandrel can be retracted into the insertion opening (111, 112) of the adsorption plate (110) in a direction different from the longitudinal direction (L) of the electrode plate, thereby preventing the conventional problem that occurs when the negative plate (2) and the positive plate (3) come into direct contact as the conventional mandrel pulls the separator (1) in the longitudinal direction (L) of the electrode plate, such as the risk of a short circuit in the secondary battery due to the direct contact between the positive plate (3) and the negative plate (2).

[0165] The preferred embodiments of the present invention described above are disclosed for illustrative purposes only, and those skilled in the art with ordinary knowledge of the present invention will be able to make various modifications, changes, and additions within the spirit and scope of the present invention, and such modifications, changes, and additions should be considered to fall within the scope of the following claims.

[0166] As described in the detailed description of the invention.

Claims

1. A secondary battery manufacturing apparatus configured such that different electrode plates are cross-stacked by folding a separator in a zigzag manner, table; A separator supply device configured to supply the separator to the table above, and configured to sequentially repeat a swinging motion for unfolding the separator and a folding motion for changing the direction in which the separator is unfolded; A suction plate arranged to adsorb the electrode plate and insert it into the table, and having an insertion opening recessed inwardly at a rim portion adjacent to the non-electrode side of the adsorbed electrode plate; and A secondary battery manufacturing apparatus comprising a mandrel configured to press and fix the electrode plate covered by the separator after the folding operation of the separator supply device, while the adsorption plate is inserted onto the electrode plate unfolded on the separator.

2. In Paragraph 1, A secondary battery manufacturing apparatus characterized by the above mandrel pressing the separator at the insertion port, thereby pressing the non-electrode side of the electrode plate covered by the separator.

3. In Paragraph 1, The above separator supply device comprises a pair of feeding rolls arranged to contact both sides of the separator, and the manufacturing device for a secondary battery is configured such that the pair of feeding rolls move between both sides of the table to perform the folding operation and the swing operation.

4. In Paragraph 3, A secondary battery manufacturing apparatus configured such that the above pair of feeding rolls perform the folding operation by moving toward the insertion opening of the adsorption plate at a position spaced apart from the edge of the adsorption plate so that the separator is folded along the edge of the adsorption plate.

5. In Paragraph 4, A secondary battery manufacturing apparatus characterized by the above pair of feeding rolls stopping at a position spaced apart from the upper part of the insertion opening so that the separator is stretched toward the upper part of the adsorption plate.

6. In Paragraph 4, A secondary battery manufacturing apparatus characterized by the above pair of feeding rolls performing a swinging motion such that the separator covers the upper surface of the electrode plate while moving away from the mandrel after the mandrel is inserted into the insertion port.

7. In Paragraph 6, A secondary battery manufacturing apparatus characterized by the adsorption plate being operated to release adsorption to the electrode plate and return to its original position before the swinging operation of the pair of feeding rolls.

8. In Paragraph 7, A secondary battery manufacturing apparatus characterized by the above-mentioned adsorption plate returning to its original position along a path that does not collide with a pair of feeding rolls.

9. In Paragraph 1, The above electrode plate has an electrode side provided with an electrode tab and a non-electrode side not provided with the electrode tab, and A secondary battery manufacturing apparatus characterized in that the above-described adsorption plate is arranged so that the non-electrode portion of the above-described electrode plate is exposed to the outside through the insertion port.

10. In Paragraph 9, A secondary battery manufacturing apparatus characterized by the fact that the above-mentioned insertion opening is formed to be recessed inward from the edge portion of the adsorption plate in the width direction of the electrode plate connecting the two non-electrode sides of the electrode plate.

11. In Paragraph 10, The above adsorption plate has an adsorption surface provided to adsorb the above electrode plate, and A secondary battery manufacturing apparatus characterized by the fact that the above-mentioned insertion opening is provided to be open in a height direction perpendicular to the above-mentioned adsorption surface.

12. In Paragraph 11, A secondary battery manufacturing apparatus characterized in that the above-mentioned insertion opening is provided to be open in the width direction and the height direction of the electrode plate at the edge portion of the above-mentioned adsorption plate.

13. In Paragraph 12, A secondary battery manufacturing apparatus characterized by the fact that the above-described adsorption plate is provided with insertion holes on both edges parallel to the length direction of the electrode plate, which are opened in opposite directions in the width direction of the electrode plate.

14. In Paragraph 11, The above insertion opening is an opening having a cross-sectional area smaller than the area of ​​the adsorption surface, and is configured to include a portion of the boundary of the adsorption surface, in a secondary battery manufacturing device.

15. In Paragraph 14, A secondary battery manufacturing apparatus characterized by the fact that the insertion opening is smaller than the width of the adsorption surface in the width direction of the electrode plate and smaller than the length of the adsorption surface in the length direction of the electrode plate perpendicular to the width direction of the electrode plate.

16. In Paragraph 9, A secondary battery manufacturing device characterized by the above-mentioned insertion port being configured to allow the insertion of a plurality of mandrels.

17. In Paragraph 1, A secondary battery manufacturing apparatus characterized by the above mandrel being installed adjacent to the table and configured to be able to enter and retract into the table in a height direction perpendicular to the floor surface on which the table is placed and in a width direction perpendicular to the height direction of the table.

18. In Paragraph 17, A secondary battery manufacturing apparatus characterized in that the above mandrel moves forward toward the upper part of the insertion opening along the width direction of the table from a standby position spaced apart from the table, and then descends from the upper part of the insertion opening to enter the insertion opening.

19. In Paragraph 18, A secondary battery manufacturing apparatus characterized by the above mandrel moving up and down in the height direction from the position placed in the insertion opening, and then moving backward in the width direction of the table from the upper part of the insertion opening to return to the original position.

20. A secondary battery manufacturing apparatus configured such that different electrode plates are cross-stacked by folding a separator in a zigzag manner, An adsorption plate provided to adsorb the above electrode plate and having an insertion opening recessed inwardly at a rim portion adjacent to the non-electrode side of the adsorbed electrode plate; and A secondary battery manufacturing apparatus comprising a mandrel inserted into the insertion port and configured to press the electrode plate covered by the separator while the adsorption plate is inserted onto the expanded separator.

21. A method for manufacturing a secondary battery for cross-stacking different electrode plates by zig-zag folding a separator, A step in which a pair of feeding rolls perform a swinging motion so that the above-mentioned separator is spread out on the table; A step of placing the electrode plate on the table so that the electrode plate is placed on the separator while the adsorption plate adsorbs one of the electrode plates; A step of performing a folding operation such that the separator is folded along the edge of the adsorption plate while the above pair of feeding rolls moves toward an insertion opening provided at the edge of the adsorption plate; and A method for manufacturing a secondary battery comprising the step of a mandrel entering the insertion port covered with the separator and pressing the separator to press a portion of the non-electrode side of the electrode plate onto the table.

22. In Paragraph 21, A method for manufacturing a secondary battery, further comprising the step of performing the swing operation while the above mandrel presses the non-electrode side of the electrode plate covered with the above separator.

23. In Paragraph 21, A method for manufacturing a secondary battery, characterized in that the above pair of feeding rolls repeatedly perform the swing motion and the folding motion along a first direction from one side of the table to the other and a second direction opposite to the first direction, so that the separator is zigzag folded.

24. In claim 21, the mandrel A first mandrel spaced apart from one side of the table and configured to press the first non-electrode side of the electrode plate covered with the separator in conjunction with the folding operation of the pair of feeding rolls in the first direction; and A method for manufacturing a secondary battery comprising a second mandrel installed spaced apart from the other side of the table parallel to the first mandrel and configured to press the second non-electrode side of the electrode plate covered with the separator in conjunction with the folding operation of the pair of feeding rolls in the second direction.

25. In Paragraph 24, A method for manufacturing a secondary battery, characterized in that when one of the first mandrel and the second mandrel is operated to pressurize the non-electrode side of the electrode plate, the other mandrel waits at a position spaced apart from the table.

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