Device and method for producing laminate for secondary battery

Abstract

The present invention provides an efficient manufacturing technology for a secondary battery stack having a separator and an electrode, which can continuously and efficiently manufacture a stacked secondary battery. The manufacturing device for the secondary battery stack of the present invention comprises: an electrode roll, which is formed by rolling a long electrode roll into a roll; a separator roll, which is formed by rolling a long separator roll into a roll; a bonding mechanism, which bonds the separator roll unwound from the separator roll and the electrode roll unwound from the electrode roll in a state where the separator roll is folded or bent to form a convex portion extending over the entire width of the separator roll, in a manner where the convex portion is located on the opposite side of the electrode roll side; and a cutting mechanism, which cuts at least the electrode roll portion of the bonded body of the separator roll and the electrode roll at the portion where the convex portion is provided.

Description

Technical Field

[0001] The present invention relates to an apparatus for producing a stacked body for a secondary battery and a method for producing a stacked body for a secondary battery. Background Art

[0002] Secondary batteries such as lithium-ion secondary batteries are small and light, have high energy density, and can be repeatedly charged and discharged, and are used in a wide range of applications. In addition, secondary batteries generally have battery components such as a positive electrode, a negative electrode, and a separator that separates the positive electrode from the negative electrode to prevent a short circuit between the positive electrode and the negative electrode.

[0003] Here, as the structure of the secondary battery, there are known a stacked type in which a positive electrode, a separator and a negative electrode are alternately stacked, and a winding type in which a long positive electrode, a separator and a negative electrode are stacked and rolled into concentric circles. In recent years, stacked secondary batteries have attracted particular attention from the perspective of excellent energy density, safety, quality and durability.

[0004] Moreover, as a manufacturing method of a stacked secondary battery, for example, a method of alternately stacking a first electrode and a second electrode wrapped with a spacer is proposed (for example, refer to Patent Document 1). Specifically, in Patent Document 1, a strip-shaped spacer coil having a plurality of mountain folds formed in the short side direction is used, a first strip-shaped electrode coil is clamped from both sides, and the contact portion of the first strip-shaped electrode coil and the strip-shaped spacer coil is bonded, and then the first strip-shaped electrode coil and the strip-shaped spacer coil are cut at the position of the mountain fold, and then the cut piece (first electrode) of the first strip-shaped electrode coil is sealed at the portion of the mountain fold constituting the spacer, and the obtained spacer seal of the first electrode is alternately stacked with the second electrode, thereby manufacturing a stacked secondary battery.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent document 1: Japanese Patent Application Publication No. 2017-63002. Summary of the invention

[0008] Problem that the invention aims to solve

[0009] However, in the manufacturing method of the stacked secondary battery described in Patent Document 1, the first strip electrode coil and the strip separator coil with the same length in the long side direction prepared in advance are bonded and cut to produce a stack of the first electrode and the separator. Therefore, in the technology described in Patent Document 1, when a plurality of stacks are required in order to continuously manufacture a stacked secondary battery, it is necessary to alternately and repeatedly prepare, bond and cut each component (coil), and the stacked secondary battery cannot be manufactured continuously and efficiently.

[0010] For such a problem, it is also possible to consider using a long strip of electrode coil and a long strip of separator coil rolled into a roll, and using a roll-to-roll method to manufacture a laminate of electrodes and separators. However, in a stacked secondary battery, from the perspective of safety such as preventing short circuits, a laminate with a separator size larger than the electrode is usually required. When the laminate is manufactured using a roll-to-roll method, the overlapping electrode coil and separator coil are cut, so there is a problem that the size of the electrode and the separator between the cutting positions is the same.

[0011] Therefore, an object of the present invention is to provide an efficient method for producing a stacked body for a secondary battery having a separator and electrodes, which can continuously and efficiently produce a stacked type secondary battery.

[0012] Solutions for solving problems

[0013] The object of the present invention is to solve the above-mentioned problems advantageously. The manufacturing device of the secondary battery stack of the present invention is characterized by having: an electrode roll, which is formed by rolling a long electrode roll into a roll; a separator roll, which is formed by rolling a long separator roll into a roll; a bonding mechanism, which bonds the separator roll unwound from the separator roll and the electrode roll unwound from the electrode roll in a state where the separator roll is bent or curved to form a convex portion extending over the entire width of the separator roll, in a manner where the convex portion is located on the opposite side of the electrode roll side; and a cutting mechanism, which cuts at least the electrode roll portion of the bonded body of the separator roll and the electrode roll at the portion where the convex portion is provided. In this way, by providing the bonding mechanism and the cutting mechanism, the separator roll unwound from the separator roll and the electrode roll unwound from the electrode roll are bonded and cut, so that the secondary battery stack can be continuously manufactured. In addition, in the laminating mechanism, the spacer coil is laminated to the electrode coil in a state where a convex portion (bend or bend portion) is formed on the spacer coil, and the cutting mechanism cuts at least the electrode coil portion at the portion where the convex portion is provided, so that a secondary battery stack having a spacer having a larger size than the electrode can be obtained. Therefore, a secondary battery stack can be efficiently manufactured, and the secondary battery stack can continuously and efficiently manufacture a stacked secondary battery.

[0014] Here, in the manufacturing device of the laminate for secondary battery of the present invention, it is preferred that the laminating mechanism has: a crimping machine, which clamps the spacer coil and the electrode coil with a spacer coil side pressing member and an electrode coil side pressing member to laminate the spacer coil and the electrode coil, and the spacer coil side pressing member has: a concave portion of a shape corresponding to the convex portion, and a suction portion that sucks the spacer coil and adsorbs it into the concave portion. By using a spacer coil side pressing member having a concave portion and a suction portion, the spacer coil and the electrode coil can be continuously laminated more efficiently in a state where a convex portion (bend or curved portion) is formed in the spacer coil.

[0015] In the manufacturing apparatus for the secondary battery laminate of the present invention, the separator web side pressing member and the electrode web side pressing member are preferably pressure rollers. The use of pressure rollers allows for more efficient continuous lamination of the separator web and the electrode web.

[0016] Furthermore, in the manufacturing device of the secondary battery stack of the present invention, it is preferred that the spacer coil side pressing member has a plurality of recesses arranged in an array, and the surface area of ​​each recess gradually increases or decreases toward the arrangement direction of the recess. By using a spacer coil side pressing member having a plurality of recesses arranged in an array and the surface area of ​​each recess gradually increases or decreases toward the arrangement direction, a stack can be obtained in which a plurality of electrodes are attached to a long spacer and the distance between the electrodes gradually increases or decreases. Moreover, using this stack, a stacked secondary battery can be manufactured efficiently and easily.

[0017] Furthermore, in the manufacturing device for the secondary battery laminate of the present invention, the convex portion preferably includes: a first convex portion and a second convex portion extending over the entire width of the spacer coil, and a valley portion located between the first convex portion and the second convex portion. If the convex portion includes the first convex portion, the second convex portion and the valley portion, the laminated body of the spacer coil and the electrode coil can be easily cut at the valley portion.

[0018] In addition, the present invention aims to advantageously solve the above-mentioned problems. The method for manufacturing a laminate for a secondary battery of the present invention is characterized by comprising: step A, in which a spacer coil unwound from a spacer roll formed by rolling a long spacer coil and an electrode coil unwound from an electrode roll formed by rolling a long electrode coil are laminated in a state where a convex portion extending over the entire width of the spacer coil is formed by bending or curving the spacer coil, and the convex portion is located on the opposite side of the electrode coil side; and step B, in which at least the electrode coil portion of the laminate of the spacer coil and the electrode coil obtained in step A is cut at a portion where the convex portion is provided. In this way, the spacer coil unwound from the spacer roll and the electrode coil unwound from the electrode roll are laminated and cut, so that the laminate for a secondary battery can be continuously manufactured. In addition, in step A, the spacer coil is attached to the electrode coil in a state where a convex portion (bend or curved portion) is formed on the spacer coil, and in step B, at least the electrode coil is partially cut at the portion where the convex portion is provided, so that a secondary battery stack having a spacer having a larger size than the electrode can be obtained. Therefore, a secondary battery stack capable of continuously and efficiently manufacturing a stacked secondary battery can be efficiently manufactured.

[0019] Here, the manufacturing method of the laminate for secondary battery of the present invention is preferably that, in the step A, an electrode coil side pressing member and a concave portion having a shape corresponding to the convex portion and a spacer coil side pressing member having a suction portion that attracts the spacer coil so that it is adsorbed in the concave portion are used, and the spacer coil and the electrode coil are sandwiched by the electrode coil side pressing member and the spacer coil side pressing member while attracting the spacer coil so that it is adsorbed in the concave portion so that the spacer coil and the electrode coil are bonded. By using a spacer coil side pressing member having a concave portion and a suction portion, the spacer coil and the electrode coil can be bonded more efficiently in a state where the spacer coil forms a convex portion (bend or curved portion).

[0020] In the method for producing a secondary battery laminate of the present invention, the separator web side pressing member and the electrode web side pressing member are preferably pressure rollers. The use of pressure rollers allows for more efficient continuous lamination of the separator web and the electrode web.

[0021] Furthermore, the manufacturing method of the secondary battery laminate of the present invention is preferably such that in the step A, the plurality of convex portions are formed so that the surface area of ​​each convex portion gradually increases or decreases toward the conveying direction of the spacer coil. In step A, a plurality of convex portions whose surface area gradually increases or decreases toward the conveying direction are formed, and in step B, the electrode coil is partially cut, so that a laminate in which a plurality of electrodes are attached to a long spacer and the distance between the electrodes gradually increases or decreases can be obtained. Moreover, using the laminate, a stacked secondary battery can be manufactured efficiently and easily.

[0022] In addition, in the method for manufacturing a secondary battery laminate of the present invention, the convex portion preferably includes a first convex portion and a second convex portion extending over the entire width of the spacer coil, and a valley portion located between the first convex portion and the second convex portion. If the convex portion includes a first convex portion, a second convex portion, and a valley portion, the laminated body of the spacer coil and the electrode coil can be easily cut at the valley portion in step (B).

[0023] Effects of the Invention

[0024] According to the present invention, a stacked secondary battery can be manufactured continuously and efficiently, and a stacked body for a secondary battery having a separator and electrodes can be manufactured efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 (a) is a cross-sectional view along the longitudinal direction of an example of a laminate of a separator coil and an electrode coil, Figure 1 (b) is a cross-sectional view along the long side direction of another example of a laminate of a separator coil and an electrode coil, Figure 1 (c) is a cross-sectional view along the longitudinal direction of another example of a laminate of a separator roll and an electrode roll.

[0026] Figure 2 (a) is a cross-sectional view along the stacking direction of an example of a stacked body for a secondary battery, Figure 2 (b) is a cross-sectional view along the stacking direction of another example of the stacked body for a secondary battery.

[0027] Figure 3 This is a cross-sectional view along the longitudinal direction of still another example of the laminate for secondary batteries.

[0028] Figure 4 It means use Figure 2 1 is an explanatory diagram of the structure of an example of an electrode structure formed of a laminate for a secondary battery shown in FIG.

[0029] Figure 5 It means use Figure 3 1 is an explanatory diagram of a process of forming an electrode structure from a laminate for a secondary battery shown in FIG.

[0030] Figure 6 (a) to (c) are cross-sectional views along the longitudinal direction of the spacer roll, showing the shapes of modified examples of the convex portion formed by folding or bending the spacer roll.

[0031] Figure 7 It is an explanatory diagram showing a schematic structure of a first example of an apparatus for producing a laminate for a secondary battery.

[0032] Figure 8 It is an enlarged representation Figure 7 A perspective view of the crimping roller of the manufacturing apparatus shown.

[0033] Fig. 9 (a) is a perspective view of a first modified example of the pressure-bonding roller. Fig. 9 (b) is a perspective view of a second modification of the pressure contact roller.

[0034] Fig.10 It is an explanatory diagram showing a schematic structure of another example of the manufacturing apparatus for the laminated body for secondary batteries. DETAILED DESCRIPTION

[0035] The method for producing a secondary battery laminate of the present invention can be used, for example, when producing a secondary battery laminate using the apparatus for producing a secondary battery laminate of the present invention. The produced secondary battery laminate is suitable for use in producing a laminated secondary battery.

[0036] Here, in the manufacturing device and manufacturing method of the secondary battery stack of the present invention, an electrode roll formed by rolling a long electrode raw material into a roll and a spacer roll formed by rolling a long spacer raw material into a roll are generally used to continuously manufacture the secondary battery stack. Specifically, in the manufacturing device and manufacturing method of the present invention, for example, a laminating mechanism is used to laminate the spacer roll released from the spacer roll and the electrode roll released from the electrode roll, and the spacer roll is bent or bent to form a convex portion extending over the entire width of the spacer roll, so that the convex portion is located on the opposite side of the electrode roll side. The laminate of the spacer roll and the electrode roll is laminated, thereby making a laminate of the spacer roll and the electrode roll. Moreover, thereafter, by using, for example, a cutting mechanism, both the spacer roll and the electrode roll or only the electrode roll are cut at the portion where the convex portion is provided, so that the secondary battery stack can be manufactured.

[0037] <Electrode Coil>

[0038] In addition, the electrode roll is not particularly limited, and for example, an electrode roll having an electrode composite material layer containing an electrode active material and a binder formed on one or both sides of a long current collector can be used. Moreover, known materials can be used as materials for the current collector and the electrode composite material layer.

[0039] <Spacer Coil>

[0040] The separator web is not particularly limited, and a long porous member made of an organic material such as a microporous film or nonwoven fabric containing a resin such as a polyolefin resin (eg, polyethylene, polypropylene, etc.) or an aromatic polyamide resin can be used.

[0041] In addition, the spacer roll preferably has a tensile modulus of 400 MPa or more and 4500 MPa or less in the direction in which the spacer roll is unwound (transportation direction). In addition, the thickness of the spacer roll is usually more than 0.5 μm, preferably more than 1 μm, usually less than 40 μm, preferably less than 30 μm, and more preferably less than 20 μm. Here, in the present invention, "tensile modulus of spacer roll" refers to the tensile modulus at a temperature of 23°C measured in accordance with JIS K7127.

[0042] <Fitting body>

[0043] In the manufacturing apparatus and manufacturing method of the present invention, the laminated body formed by the above-mentioned electrode coil and separator coil is not particularly limited, and for example, it has the following structure: Figure 1 The structures of the cross sections along the long side direction in (a) to (c).

[0044] Here, Figure 1 The laminate 1 shown in (a) has an electrode coil 10 ( Figure 1 The upper surface of (a) is adhered to a spacer roll 20, wherein the electrode roll 10 is formed by forming an electrode composite material layer 12 on both sides of a collector 11, and the spacer roll 20 is formed by forming a plurality of convex portions (bend portions) 21 with a semicircular arc-shaped cross-section extending across the entire width at specified intervals.

[0045] also, Figure 1 The laminated body 1A shown in (b) has a structure in which a separator coil 20 is laminated on both sides of an electrode coil 10, wherein the electrode coil 10 is formed by forming an electrode composite material layer 12 on both sides of a current collector 11, and the separator coil 20 is formed by forming a plurality of convex portions (curved portions) 21 with a semicircular arc-shaped cross section extending across the entire width at a predetermined interval. In addition, in the laminated body 1A, the formation position of the convex portion 21 of the separator coil 20 laminated on one surface of the electrode coil 10 is consistent with the formation position of the convex portion 21 of the separator coil 20 laminated on the other surface of the electrode coil 10. That is, the convex portion 21 of the separator coil 20 laminated on one surface of the electrode coil 10 faces the convex portion 21 of the separator coil 20 laminated on the other surface of the electrode coil 10, sandwiching the electrode coil 10. In addition, the portion between the convex portions 21 of the separator coil 20 is bonded to the electrode coil 10.

[0046] and then, Figure 1 The laminated body 1B shown in (c) has one ( Figure 1 The electrode roll 10 is formed by forming an electrode composite material layer 12 on both sides of the current collector 11, and the separator roll 20 is formed by forming a plurality of convex portions (bend portions) 21 with a semicircular arc shape in cross section extending across the entire width at predetermined intervals. In addition, in the laminated body 1B, the convex portions 21 are repeatedly provided with a size that increases from one side in the long side direction ( Figure 1 (c) to the left) towards the other side ( Figure 1 The electrode material roll 10 is bonded to the portion between the protrusions 21A, 21B, and 21C in the spacer material roll 20 (for example, a pattern consisting of a combination of three protrusions 21A, 21B, and 21C that become larger in sequence in the example).

[0047] In addition, Figure 1 In (a) to (c), the electrode roll 10 is shown to have the electrode composite material layer 12 on both sides of the current collector 11, but the electrode roll may also have the electrode composite material layer formed only on one surface of the current collector.

[0048] In addition, Figure 1 In (a) to (c), the convex portion 21 is shown to have a semicircular arc cross section, but the shape of the convex portion can be Figure 6 Any shape such as the shapes shown in (a) to (c) of FIG. Figure 6 The convex portion 21D shown in (a) is triangular in shape. Figure 6 The convex portion 21E shown in (b) is a quadrilateral, Figure 6 The convex portion 21F shown in (c) has a shape including a first convex portion 21a, a second convex portion 21c, and a valley portion 21b located between the first convex portion 21a and the second convex portion 21c. Figure 6 In the case of a shape having the first convex portion 21a and the second convex portion 21c adjacent to each other and the valley portion 21b located between the first convex portion 21a and the second convex portion 21c as shown in (c), the spacer roll 20 can be easily cut at the valley portion 21b.

[0049] <Laminate for secondary battery>

[0050] Furthermore, in the manufacturing device and manufacturing method of the present invention, the secondary battery stack obtained by cutting at least the electrode roll portion of the above-mentioned laminated body at the portion where the convex portion is provided has the following structure: a spacer formed by the cut piece of the spacer and having a larger size than the electrode is laminated on one side or both sides of the electrode formed by the cut piece of the electrode roll, or a plurality of electrodes formed by the cut piece of the electrode roll are laminated on one surface of a long spacer formed by the cut piece of the spacer roll. Specifically, the secondary battery stack is not particularly limited, and for example, it has the structure shown in Figure 2 The structure of the cross section along the stacking direction in (a) and (b), or Figure 3 The structure of the cross section along the long side.

[0051] Here, Figure 2 The secondary battery stack 2 shown in (a) can be formed by Figure 1 The electrode roll 10 and the separator roll 20 of the laminated body 1 shown in (a) are cut at the approximately center (top) position of the protrusion 21. In addition, the secondary battery laminate 2 has: an electrode 10a, which is formed by the cut pieces of the electrode roll 10, and an electrode composite material layer 12a is provided on both sides of the collector 11a; a separator 20a, which is formed by the cut pieces of the separator roll 20, has a larger size than the electrode 10a and is laminated to one ( Figure 2 (a) upper side) surface.

[0052] In addition, Figure 2 In (a), the length of the spacer 20a protruding from both ends of the electrode 10a is approximately 1 / 2 of the difference between the length of the protrusion 21 cut in the laminate 1 and the length of the electrode roll 10 at the position facing the protrusion 21.

[0053] also, Figure 2 The secondary battery stack 2A shown in (b) can be formed by Figure 1 The electrode roll 10 and the separator roll 20 of the laminated body 1A shown in (b) are cut at the approximately center (top) position of the protrusion 21. In addition, the secondary battery laminate 2A has: an electrode 10a, which is formed by the cut pieces of the electrode roll 10, and an electrode composite material layer 12a is provided on both sides of the collector 11a; a separator 20a, which is formed by the cut pieces of the separator roll 20, has a larger size than the electrode 10a and is laminated to both sides of the electrode 10a.

[0054] In addition, Figure 2 In (b), the length of the spacer 20a protruding from both ends of the electrode 10a is approximately 1 / 2 of the difference between the length of the protrusion 21 cut in the laminate 1 and the length of the electrode roll 10 at the position facing the protrusion 21.

[0055] Furthermore, when the above-mentioned secondary battery laminate 2 and secondary battery laminate 2A are used, for example Figure 4 By stacking as shown, an electrode structure that can be used in a stacked secondary battery can be produced.

[0056] Here, in Figure 4 In the figure, symbol 2' is the negative electrode laminate, 10a' is the negative electrode, 11a' is the negative electrode collector, 12a' is the negative electrode composite material layer, 2" is the positive electrode laminate, 10a" is the positive electrode, 11a" is the positive electrode collector, 12a" is the positive electrode composite material layer, and 20a is the separator. In addition, in this example, from the viewpoint of improving the safety of the secondary battery, the size of the positive electrode 10a" is smaller than that of the negative electrode 10a'. In addition, 11b is a positive electrode collector with a current lead-out terminal, and 11c is a negative electrode collector with a current lead-out terminal.

[0057] and then, Figure 3 The secondary battery laminate 2B shown can be obtained by the following method: Figure 1 The laminated body 1B shown in (c) is formed by cutting the electrode roll 10 and the separator roll 20 at the approximately center (top) position of the protrusion 21A, and only cutting the electrode roll 10 at the position facing the approximately center (top) position of the protrusion 21B and the protrusion 21C. In addition, the secondary battery laminate 2B has the following structure: a plurality of (in the example, three are bonded to the lower surface) electrodes 10a are bonded to one surface of a long spacer 20a formed by a cut piece of the separator roll 20, and the electrode 10a is formed by the cut piece of the electrode roll 10, and an electrode composite material layer 12a is provided on both sides of the collector 11a.

[0058] In addition, Figure 3 In FIG. 1 , the distances L1 and L2 of the electrode 10a correspond to the lengths of the protrusions 21B and 21C that are not cut in the laminated body 1B, respectively.

[0059] Furthermore, when the above-mentioned secondary battery laminate 2B is used, for example Figure 5By stacking and winding as shown, an electrode structure that can be used in a stacked secondary battery can be produced. The electrode structure has a structure in which n first electrodes (negative electrodes or positive electrodes; in the example, negative electrodes 10a') and n-1 second electrodes (positive electrodes or negative electrodes; in the example, positive electrodes 10a") are alternately stacked, and has a structure in which the first stack and the second stack are stacked in a manner in which the first electrode is located at one end of the long side of the first stack via a separator of the first stack, and the second electrode is located at the other end of the long side of the second stack and faces each other, and is wound toward the other end in the long side direction, wherein the first stack is formed by laminating n-1 first electrodes at a predetermined interval on one surface of a long strip separator, and the second stack is formed by laminating n-1 second electrodes at a predetermined interval on one surface of a long strip separator, and laminating a first electrode on the other surface of the separator in a manner in which the first electrode is located at one end of the long side of the separator and faces the second electrode.

[0060] In other words, Figure 5 The electrode structure shown has: a first stacked body formed by laminating a plurality of first electrodes on one surface of a long first separator in a direction of a long side of a first separator so as to be separated from each other; and a second stacked body formed by laminating a plurality of second electrodes on one surface of a long second separator in a direction of a long side of a second separator so as to be separated from each other; and a first electrode is laminating on the other surface of the second separator in a manner facing the second electrode located at one end of the long side of the second separator; from the first electrode of the second stacked body toward one side of the laminating direction, the second separator, the second electrode, the first separator, and the first electrode are sequentially laminated in the order; from the first electrode of the second stacked body toward the other side of the laminating direction, the second separator, the second electrode, the first separator, and the first electrode are sequentially laminated in the order. In addition, the first separator and the second separator are wound around the first electrode of the second stacked body as the winding center.

[0061] In addition, when forming an electrode structure, the spacer can be loosened or tightened during winding, but the so-called "predetermined interval" between adjacent electrodes generally refers to the length that allows the first electrode and the second electrode to be arranged in the vertical direction, which is greater than the total thickness of all electrodes and spacers sandwiched between the electrodes during winding.

[0062] Here, in Figure 5In the figure, symbol 2' is the negative electrode stack, 10a' is the negative electrode, 2" is the positive electrode stack, 10a" is the positive electrode, and 20a is the separator. In addition, in this example, the negative electrode 10a', which is located on one end side of the positive electrode stack 2" and faces the positive electrode 10a" with the separator 20a sandwiched therebetween, can be arranged on the separator 20a using any method used in the manufacture of secondary batteries. In addition, the distance between each electrode (negative electrode 10a', positive electrode 10a") can be a length that is greater than the total thickness of the negative electrode 10a', the positive electrode 10a" and the separator 20a sandwiched between the electrodes during winding, and that allows the negative electrode 10a' and the positive electrode 10a" to be arranged in the vertical direction. Moreover, in this example, from the viewpoint of improving the safety of the secondary battery, the size of the positive electrode 10a" is smaller than the size of the negative electrode 10a'.

[0063] <Manufacturing device and manufacturing method of laminate for secondary battery>

[0064] Furthermore, the laminate for secondary battery as described above can be used, for example Figure 7 The manufacturing device 100 shown is used for manufacturing.

[0065] Figure 7 The manufacturing device 100 shown has: an electrode roll 10', which is formed by rolling a long electrode roll 10 into a roll; a spacer roll 20', which is formed by rolling a long spacer roll 20 into a roll; a rubber roller 30 and an adsorption roller 40, which serve as crimping rollers for clamping the electrode roll 10 and the spacer roll 20 for crimping; and a cutting mechanism 50, which cuts the laminated body of the spacer roll 20 and the electrode roll 10. In addition, the manufacturing device 100 also has a conveying roller 60 for conveying the electrode roll 10 and the spacer roll 20, a tension buffer 70 for adjusting the tension of the spacer roll 20, and an acceleration device 80 for increasing the conveying speed of the spacer roll 20. Moreover, according to the manufacturing device 100, it is possible to form, for example Figure 1 The laminated body 1 shown in (a) is cut by a cutting mechanism 50 to obtain Figure 2 The secondary battery stack 2 shown in (a) .

[0066] Here, the suction roller 40 has a concave portion 41 having a shape (semicircular arc shape) corresponding to the convex portion 21 of the laminated body 1 formed and cut in the manufacturing device 100, and a suction portion (not shown) that sucks and adsorbs the spacer roll 20 in the concave portion 41. Figure 8 The rubber roller 30 and the suction roller 40 are shown in an enlarged manner, and the concave portion 41 of the suction roller 40 is provided over the entire width of the suction roller 40 .

[0067] Furthermore, the tension buffer 70, the acceleration device 80, the metal roller 30, and the suction roller 40 function as a bonding mechanism, and bond the spacer coil 20 unwound from the spacer roll 20' and the electrode coil 10 unwound from the electrode roll 10' in a state where the spacer 20 is bent by suctioning it to the concave portion 41 of the suction roller 40 to form a convex portion 21 extending over the entire width of the spacer coil 20, in such a manner that the convex portion 21 is located on the opposite side to the electrode coil 10 side. In addition, in the bonding mechanism, the rubber roller 30 and the suction roller 40 function as a pressing member on the electrode coil side of the pressing member, and the suction roller 40 is a pressing member on the spacer coil side of the pressing member.

[0068] According to the manufacturing device 100, the spacer coil 20 unrolled from the spacer roll 20' and the electrode coil 10 unrolled from the electrode roll 10' can be bonded together in a state where the convex portion 21 extending over the entire width of the spacer coil 20 is formed by adsorbing the spacer 20 on the concave portion 41 of the adsorption roller 40, so that the convex portion 21 is located on the opposite side of the electrode coil 10 (step (A)). In addition, by cutting the bonded body of the spacer coil 20 and the electrode coil 10 obtained in the step (A) at the portion where the convex portion 21 is provided, a Figure 2 (a) shows the stacked body 2 for secondary batteries (step (B)). Therefore, it is possible to continuously manufacture stacked bodies for secondary batteries in which the size of the separator is larger than that of the electrode. And, as a result, it is possible to continuously and efficiently manufacture stacked secondary batteries.

[0069] Here, in the manufacturing apparatus 100, in order to form Figure 1 The laminated body 1 shown in (a) is cut by the cutting mechanism 50 to produce Figure 2 The secondary battery stack 2 shown in (a) uses a suction roller 40 having four concave portions 41 of the same shape, but in the formation of Figure 1 The laminated body 1B shown in (c) is manufactured Figure 3 In the case of the secondary battery laminate 2B shown in the figure, the suction roller 40 is replaced with Fig. 9 The suction roller 40A shown in (a) may be used.

[0070] The suction roller 40A has a plurality of (four in the example) recesses 41A, 41B, 41C, and 41D arranged in the circumferential direction of the suction roller 40A, and the surface area of ​​each recess 41A, 41B, 41C, and 41D gradually increases or decreases (gradually increases in the counterclockwise direction in the example) toward the arrangement direction of the recesses 41A, 41B, 41C, and 41D. That is, in the suction roller 40A, the sizes of the recesses 41A, 41B, 41C, and 41D increase in sequence.

[0071] Furthermore, when using the suction roller 40A to manufacture Figure 3 In the case of the secondary battery laminate 2B shown in the figure, for example, the rubber roller 30 and the suction roller 40A form convex portions using the concave portions 41A, 41B, 41C, and 41D while attaching the spacer roll 20 and the electrode roll 10. The cutting mechanism cuts the electrode roll 10 and the spacer roll 20 at the portion where the smallest convex portion formed by the smallest concave portion 41A is located, and the cutting mechanism only cuts the electrode roll 10 at the portion where the convex portion formed by the concave portions 41A, 41B, 41C, and 41D is located. In this way, it is possible to efficiently obtain Figure 3 The secondary battery laminate 2B shown in FIG. Figure 5 The electrode structure shown is used to continuously and efficiently manufacture stacked secondary batteries.

[0072] The cutting mechanism cuts only the electrode coil 10 , for example by providing a cutting blade (not shown) on the opposite side of the electrode coil 10 to the separator coil 20 and moving the cutting blade to a position between the convex portions of the electrode coil 10 and the separator coil 20 .

[0073] In addition, in the formation of Figure 6 The laminated body of the convex portion 21F shown in (c) is manufactured Figure 2 In the case of the secondary battery stack 2 shown in (a), the suction roller 40 is replaced with Fig. 9 The suction roller 40B shown in (b) may be used.

[0074] The suction roller 40B has a recess 41F including first and second recesses 41a and 41c having shapes corresponding to the first and second projections 21a and 21c and a top 41b having a shape corresponding to the valley 21b located between the first and second recesses 41a and 41c adjacent to each other.

[0075] Furthermore, when the suction roller 40B is used to form Figure 6 The laminated body of the convex portion 21F shown in (c) is manufactured Figure 2 In the case of the secondary battery stack 2 shown in (a), for example, the rubber roller 30 and the adsorption roller 40B form the convex portion 21F using the concave portion 41F while attaching the spacer coil 20 and the electrode coil 10, and the cutting mechanism cuts the electrode coil 10 and the spacer coil 20 at the position of the valley 21b of the convex portion 21F. In this way, a secondary battery stack in which the size of the spacer is larger than that of the electrode can be continuously and efficiently manufactured. Moreover, as a result, a stacked secondary battery can be continuously and efficiently manufactured.

[0076] In addition, in the above description, although the case where a laminated body formed by laminating the separator roll 20 on one surface of the electrode roll 10 and cutting it with a cutting mechanism to manufacture a secondary battery laminated body formed by laminating the separator on one surface of the electrode is described, in the case where a laminated body formed by laminating the separator roll 20 on both surfaces of the electrode roll 10 is manufactured Figure 2 In the case of the secondary battery laminate 2A shown in (b), for example, Fig.10 The manufacturing apparatus 100A is shown.

[0077] Here, in Fig.10 In the Figure 7 Add the same structural components Figure 7 The same symbols are omitted in the following description.

[0078] Furthermore, according to the manufacturing device 100A, a pair of suction rollers 40 as pressure-bonding rollers can be used to bond the spacer coil 20 unrolled from the two spacer coils 20' and the electrode coil 10 unrolled from the electrode coil 10' and located between the spacer coils 20, with the protrusion 21 being located on the opposite side of the electrode coil 10 side, while the spacer coil 20 is bent by the concave portion 41 of the suction roller 40 to form a protrusion 21 extending over the entire width of the spacer coil 20 (process (A)). In addition, by cutting the bonded body of the spacer coil 20 and the electrode coil 10 obtained in process (A) at the portion where the protrusion 21 is provided, it is possible to obtain Figure 2 The secondary battery stack 2A shown in (b) (step (B)). Therefore, it is possible to continuously manufacture a secondary battery stack having a spacer size greater than the electrode size. And, as a result, it is possible to continuously and efficiently manufacture a stacked secondary battery.

[0079] In the manufacturing apparatus 100A, the conveyance of the laminate having the protrusions 21 on both surfaces is not particularly limited, and can be carried out using, for example, a lifting conveyance mechanism such as a conveyance roller having a concave portion having a shape corresponding to the shape of the protrusion 21 or an air lift roller.

[0080] As mentioned above, the manufacturing apparatus and the manufacturing method of the laminated body for secondary batteries of the present invention have been described using examples, but the manufacturing apparatus and the manufacturing method of the laminated body for secondary batteries of the present invention are not limited to the above examples.

[0081] For example, a die or the like may be used as a crimping machine for sandwiching and bonding the spacer coil and the electrode coil. In this case, a recess having a shape corresponding to the convex portion and a suction portion for sucking and adsorbing the spacer coil in the recess may be formed in the die portion that serves as a pressing member on the side of the spacer coil.

[0082] In addition, the convex portion is formed by using the concave portion, and the spacer coil can also be made to follow the concave surface by using pressing and / or static electricity. Furthermore, in the case where the tensile elastic modulus in the conveying direction of the spacer coil is greater than 400MPa and less than 4500MPa, and / or the thickness of the spacer coil is greater than 0.5μm and less than 40μm, etc., when it is difficult to form, convey and cut the laminate while maintaining the shape of the convex portion due to the softness of the spacer coil, the spacer coil can be heated in the concave portion to add folding, or a shape retaining member for retaining the convex portion can be arranged between the spacer coil and the electrode coil.

[0083] Possible industrial applications

[0084] According to the manufacturing apparatus and manufacturing method of the present invention, a stacked secondary battery can be manufactured continuously and efficiently, and a stacked body for a secondary battery having a separator and an electrode can be manufactured efficiently.

[0085] Description of Reference Numerals

[0086] 1.1A, 1B Fitting

[0087] 2, 2A, 2B Secondary battery laminate

[0088] 2' Negative electrode stack

[0089] 2” positive electrode stack

[0090] 10 Electrode coil

[0091] 10a Electrode

[0092] 10a' negative electrode

[0093] 10a” positive

[0094] 10' Electrode Roll

[0095] 11. Current Collector

[0096] 11a Current Collector

[0097] 11a' Negative electrode collector

[0098] 11a” positive electrode collector

[0099] 11b Positive electrode current collector with current extraction terminal

[0100] 11c Negative electrode current collector with current extraction terminal

[0101] 12 Electrode composite material layer

[0102] 12a Electrode composite material layer

[0103] 12a' Negative electrode composite material layer

[0104] 12a” positive electrode composite material layer

[0105] 20 Spacer Coil

[0106] 20a Spacer

[0107] 20' Spacer Roll

[0108] 21 convex part

[0109] 21A, 21B, 21C, 21D, 21E, 21F convex part

[0110] 21a first convex part

[0111] 21b Valley

[0112] 21c second convex part

[0113] 30 Rubber Roller

[0114] 40, 40A, 40B suction roller

[0115] 41, 41A, 41B, 41C, 41D, 41F concave part

[0116] 41a first recess

[0117] 41b Top

[0118] 41c second recess

[0119] 50 Cutting mechanism

[0120] 60 conveyor roller

[0121] 70 Tension buffer

[0122] 80 Accelerator

[0123] 100, 100A manufacturing equipment

Claims

1. A manufacturing device for a secondary battery stack, comprising: Electrode coil, which is formed by rolling a long strip of electrode coil material into a roll; A spacer roll, which is formed by rolling a long strip of spacer roll material into a roll; a bonding mechanism for bonding the spacer material roll unwound from the spacer roll and the electrode material roll unwound from the electrode roll in a state where the spacer material roll is folded or bent to form a convex portion extending over the entire width of the spacer material roll, so that the convex portion is located on the opposite side of the electrode material roll; as well as a cutting mechanism for cutting at least the electrode roll portion of the laminated body of the separator roll and the electrode roll at the portion where the protrusion is provided, The laminating mechanism comprises: a crimping machine which sandwiches the spacer coil and the electrode coil with a spacer coil side pressing member and an electrode coil side pressing member to laminate the spacer coil and the electrode coil. The separator web-side pressing member includes a recessed portion having a shape corresponding to the raised portion, and a suction portion that sucks the separator web to be adsorbed into the recessed portion.

2. The manufacturing device of the laminate for secondary battery according to claim 1, wherein: The spacer coil side pressing member and the electrode coil side pressing member are pressure contact rollers.

3. The manufacturing device of the laminate for secondary battery according to claim 1 or 2, wherein: The spacer coil side pressing member has a plurality of recessed portions arranged in an array, The surface area of ​​each recess gradually increases or decreases toward the arrangement direction of the recess.

4. The manufacturing device of the laminate for secondary battery according to claim 1 or 2, wherein: The convex portion includes a first convex portion and a second convex portion extending across the entire width of the spacer web, and a valley portion located between the first convex portion and the second convex portion.

5. A method for manufacturing a laminate for a secondary battery, comprising: Step A: a spacer coil unwound from a spacer coil formed by rolling a long spacer coil and an electrode coil unwound from an electrode coil formed by rolling a long electrode coil, in a state where the spacer coil is folded or bent to form a convex portion extending over the entire width of the spacer coil, and the convex portion is located on the opposite side of the electrode coil side. Step B, cutting at least the electrode material roll portion of the laminated body of the separator material roll and the electrode material roll obtained in step A at the portion where the protrusion is provided, In the process A, an electrode roll side pressing member, a recessed portion having a shape corresponding to the protrusion and a spacer roll side pressing member having a suction portion that attracts the spacer roll to make it adsorbed in the recessed portion are used. While attracting the spacer roll to make it adsorbed in the recessed portion, the electrode roll side pressing member and the spacer roll side pressing member are used to clamp the spacer roll and the electrode roll so that the spacer roll and the electrode roll are bonded together.

6. The method for producing a laminate for a secondary battery according to claim 5, wherein: The spacer coil side pressing member and the electrode coil side pressing member are pressure contact rollers.

7. The method for producing a laminate for a secondary battery according to claim 5 or 6, wherein: In the step A, the plurality of protrusions are formed so that the surface area of ​​each protrusion gradually increases or gradually decreases toward the conveying direction of the spacer roll.

8. The method for producing a laminate for a secondary battery according to claim 5 or 6, wherein: The protrusions include a first protrusion and a second protrusion extending across the entire width of the spacer web, and a valley between the first protrusion and the second protrusion.

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