JP2009032544A - Manufacturing method and device of laminated battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method and device of a laminated battery which has no possibility of mixing of foreign matters and which is superior in reliability. <P>SOLUTION: Portions in which a first pawl 1a, a second pawl 1b, a third pawl 1c, and a fourth pawl 1d, give a retaining force to a laminate in the time of laminating operation are always only at two places on the laminate, and that, a bearing 3, a robot 10, a cylinder 5, and a roller 4 which are a driving part of the pawl are installed at a lower part than the laminate, and furthermore, operation of the first pawl 1a, the second pawl 1b, the third pawl 1c, and the fourth pawl 1d has a degree of freedom in a perpendicular direction and in a parallel direction to a laminating face. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method and apparatus for manufacturing a stacked battery, and more particularly to a method and apparatus for maintaining the stack position of a stacked battery element.

  2. Description of the Related Art As a laminated battery such as a lithium ion secondary battery, a battery in which a battery element made of a laminate in which a flat positive electrode and a negative electrode are laminated via a separator is housed in an outer container is known. FIG. 4 shows the structure of a general stacked battery. As shown in FIG. 4, in such a stacked battery, a pair of positive foil 14 and separator 13 is laminated on a pair of negative electrode foil 12 and separator 13 in the lowermost layer, and then they are alternately laminated. In this structure, the negative electrode foil 12 is disposed in the upper layer.

  Conventionally, when stacking such stacked batteries, a method of preventing stacking deviation by fixing the stacked body after bringing the electrode end face into contact with a certain reference surface (for example, Patent Document 1) ).

  FIG. 5 is an explanatory diagram of a conventional method for manufacturing a stacked battery. As shown in FIG. 5, first, the negative electrode foil 16 is placed so that the reference surfaces 21 </ b> A and 21 </ b> B of the battery assembly jig 20 are used as a reference and the end surfaces of the negative electrode foil 16 are in contact with both reference surfaces. Next, in order to prevent the displacement of the separator 17 from the positive foil and the negative foil, the separator 17 is bonded to the insulating material layers 20A and 20B (not shown) previously applied to the positive electrode active material non-applied portion of the positive foil 15. Then, the end surfaces of the insulating material layers 20A and 20B (not shown) are placed in contact with the reference surfaces 21A and 21B, respectively. As described above, after a predetermined number of positive foils 15 and negative electrode foils 16 to which the separators 17 are bonded are laminated, the fixing tapes 23 attached to the fixing tape holes 22A and 22B are fixed so as not to be displaced.

JP 2006-236994 A

  However, in the conventional stacking method of the stacked battery, there is a problem that foreign matter is mixed into the laminate, and the separator is damaged by the foreign matter. In particular, if a drive unit is present above the laminated body, it becomes a dust generation source, and foreign matter is easily mixed. Furthermore, the active material layer applied to the electrode foil is easily peeled off from the electrode body, and is peeled off most remarkably at the electrode foil end face. When this is mixed between laminates, short-circuit between different electrodes and electric discharge occur, so that when contacting the electrode foil, it is necessary to minimize the contact area and minimize the peeling of the active material layer.

  However, in the conventional laminating method using the jig shown in FIG. 5, the electrode foil end face is pressed against the positioning reference surface, so that the above-mentioned active material layer is easily peeled off. However, foreign matter was mixed into the laminate.

  Accordingly, an object of the present invention is to solve the above-described problems and provide a highly reliable manufacturing method and apparatus for a stacked battery in which foreign matter is not mixed into the stacked body.

  The method for producing a laminated battery according to the present invention is a method for producing a laminated battery having a structure in which positive and negative foils are alternately laminated and a separator is sandwiched between positive and negative electrodes. Two claws and a laminated base are provided, and the claws during the laminating operation apply a holding force only to two places on the laminated body. Further, the present invention is characterized in that the movement of the claw has a degree of freedom in a direction perpendicular to and parallel to the laminated surface. Further, the present invention is characterized in that the trajectory of the vertical movement of the claw can also draw an arc or an elliptical arc. Further, the present invention is characterized in that the claw has at least two or more driving parts, and the driving parts are installed below the laminated body. In addition, the present invention is characterized by comprising a claw for maintaining the laminated state of the laminated battery, a laminated base, and a drive unit for operating the claw.

  According to the present invention, in a method for manufacturing a stacked battery including a laminate in which a rectangular positive foil and a negative foil are laminated via a separator, the positive foil, the negative foil, and the Among the four claws that hold the four corners of the separator, two positive claws alternately hold the positive foil, the negative foil, and the separator at diagonal positions, and the positive foil, the negative foil, A laminated battery manufacturing method is obtained, wherein the separator is laminated to form the laminated body.

  In addition, according to the present invention, there is provided the method for manufacturing a stacked battery as described above, wherein the claw operates in a direction perpendicular to and parallel to the stacked surface of the base.

  Further, according to the present invention, there is obtained the above-described method for manufacturing a stacked battery, wherein the trajectory of the movement of the claw draws an arc or an elliptical arc.

  Further, according to the present invention, there is obtained the above-described method for manufacturing a stacked battery, wherein the driving unit is installed below the stacked body.

  In addition, according to the present invention, in the laminated battery manufacturing apparatus including a laminate in which a rectangular positive electrode foil and a negative electrode foil are laminated via a separator, the base on which the positive electrode foil, the negative electrode foil, and the separator are laminated. And four claws for holding the four corners of the positive foil, the negative foil and the separator, and a drive unit for operating the four claws, respectively, and by two claws among the four claws, A laminated battery manufacturing apparatus is obtained in which the positive electrode foil, the negative electrode foil, and the separator are alternately held at diagonal positions to form the laminate.

  In addition, according to the present invention, there is obtained the above-described laminated battery manufacturing apparatus, wherein the claw operates in a direction perpendicular to and parallel to the laminated surface of the base.

  In addition, according to the present invention, the stacked battery manufacturing apparatus described above is characterized in that the trajectory of the movement of the claws draws an arc or an elliptical arc.

  Further, according to the present invention, there is obtained the above-described stacked battery manufacturing apparatus, wherein the driving unit is installed below the stacked body.

  By adopting the configuration as described above, the present invention can provide a highly reliable method for manufacturing a stacked battery in which no foreign matter is mixed into the stack of battery elements.

  Further, by adopting the configuration as described above, in the present invention, there is no need for a pre-process for fixing between the separator and the positive electrode foil for preventing the misalignment of the stacking position, so that the manufacturing cost can be greatly reduced.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view showing a transfer state of a positive electrode foil in a stack position holding mechanism in a stacked battery manufacturing apparatus of the present invention, and FIG. 1 (a) shows a state immediately after the positive electrode foil has been transferred. 1B is a side view of the state immediately after the positive foil has been transferred, FIG. 1C is a plan view of the state where the first and fourth claws have moved, and FIG. (D) is a side view of a state in which the first and fourth claws have moved. FIG. 2 is an explanatory view showing a separator transfer state in the stack position holding mechanism in the stacked battery manufacturing apparatus of the present invention, and FIG. 2 (a) is a plane showing a state immediately after the separator is transferred. 2 is a side view showing a state immediately after the separator has been transferred, FIG. 2C is a plan view showing a state in which the second claw and the third claw have moved, FIG. (D) is a side view which shows the state which the 2nd nail | claw and the 3rd nail | claw moved. FIG. 3 is an explanatory view showing the state of transfer of the negative electrode foil in the stack position holding mechanism in the stacked battery manufacturing apparatus of the present invention, and FIG. 3A shows the state immediately after the negative electrode foil has been transferred. 3B is a side view showing a state immediately after the negative electrode foil has been transferred, and FIG. 3C is a plan view showing a state in which the first and fourth claws have moved. FIG. 3D is a side view showing a state in which the first and fourth claws have moved.

  In this embodiment, as shown in FIGS. 1 to 3, an example in which a rectangular positive electrode foil 8, a separator 6, a negative electrode foil 7, and a separator 6 are stacked in this order on a base 9 is shown. As shown in FIG. 1, the stack position holding mechanism in the stacked battery manufacturing apparatus of the present invention includes a base 9, four claws 1, and a drive unit that drives these claws. The claw 1 includes a first claw 1a, a second claw 1b, a third claw 1c, and a fourth claw 1d. The first claw 1a and the fourth claw 1d are provided on one long side of the rectangular positive foil 8 or the like, and the second claw 1b and the third claw 1c are provided on the other long side. Yes. Further, the first claw 1a and the second claw 1b, and the third claw 1c and the fourth claw 1d are positioned so as to face each other with respect to the longitudinal center axis of the rectangular positive electrode foil 8 or the like. Yes. The surface where the first claw 1a to the fourth claw 1d are in contact with the electrode and the separator is processed to Ra (arithmetic average surface roughness) = 0.2 μm, and the electrode is generated by the frictional force caused by the thrust of the robot 10. In addition, the separator is prevented from being damaged, and at the same time, scattering of the active material layer is prevented. Further, a low dust generation type grease is used for lubricating the bearing 3 and the roller 4 to reduce dust generation due to grease scattering during operation. The robot 10 and the cylinder 5 use parts having a cleanness of ISO class 4 or less that suppresses dust generation from inside the parts.

  The drive unit includes a bearing 3, a robot 10, a cylinder 5, and a roller 4, and is disposed below the laminated body. A shaft 2 is attached to the lower part of the first claw 1 a to the fourth claw 1 d in parallel to the stacking direction, and this shaft 2 is attached to be rotatable along the bearing 3. A robot 10 is attached to the other lower part of the claw 1. The robot 10 can move vertically with respect to the stacking direction, and the operation end of the robot 10 can hold an arbitrary position by the multi-point positioning function. Therefore, by operating the robot 10, the first claw 1 a to the fourth claw 1 d can be moved and held at any height in the stacking direction along the bearing 3. An attachment bracket 11 of the cylinder 5 is connected to the attachment end side of the robot 10 via a roller 4 so as to be horizontally rotatable. Accordingly, by operating the cylinder 5, the first claw 1 a to the fourth claw 1 d held at an arbitrary height can be moved along the roller 4 to a predetermined position horizontally in the stacking direction. . The shaft 2, the robot 10, the bracket 11, the roller 4, and the cylinder 5 are provided on the first claw 1a to the fourth claw 1d, respectively. With the above mechanism, the first claw 1a to the fourth claw 1d can be independently operated in the horizontal and vertical directions with respect to the laminated surface of the laminated body. Further, by performing circular interpolation of the operations of the robot 10 and the cylinder 5, the trajectory of each operation of the first claw 1a to the fourth claw 1d can draw an arc or an elliptical arc.

  Next, a stacking operation in the stacked battery manufacturing apparatus of the present invention will be described with reference to FIGS. First, the positive foil is transferred to the apparatus. FIG. 1A and FIG. 1B show a state immediately after the positive foil 8 has been transferred. The positive electrode foil 8 may be adsorbed and held on the base 9, for example. Next, as shown in FIGS. 1C and 1D, the robot 10 lifts the first claw 1a and the fourth claw 1d, and the cylinder 5 moves to the first claw 1a and the fourth claw 1d. Is moved parallel to the laminated surface. Further, as shown in FIGS. 2A and 2B, the robot 10 moves vertically with respect to the laminated surface, and the first claw 1 a and the fourth claw 1 d hold the positive foil 8. At the same time, the separator 6 is transported, and as shown in FIGS. 2C and 2D, the second claw 1b and the third claw 1c are connected to the first claw 1a and the fourth claw 1d. The separator 6 is held by the same operation. Next, as shown in FIGS. 3 (a) and 3 (b), the first claw 1a and the fourth claw 1d move to the left and right of the figure, and the claw shown in FIG. 3 (c) and FIG. 3 (d). As shown, the conveyed negative foil 7 is held by the aforementioned operation. During the left and right operations, the first claw 1a to the fourth claw 1d are raised by about 1 mm to prevent the electrode foil, the separator from being damaged, the stacking error, and the active material layer from being scattered. By repeating such an operation, the positive foil, the separator, and the negative foil are sequentially laminated.

Explanatory drawing which shows the transfer state of the positive electrode foil in the lamination position holding mechanism in the manufacturing apparatus of the laminated battery of this invention. Fig.1 (a) is a top view which shows the state immediately after the positive electrode foil has been transferred. FIG.1 (b) is a side view which shows the state immediately after the positive electrode foil has been transferred. FIG.1 (c) is a top view which shows the state which the 1st nail | claw and the 4th nail | claw moved. FIG.1 (d) is a side view which shows the state which the 1st nail | claw and the 4th nail | claw moved. Explanatory drawing which shows the transfer state of the separator in the lamination position holding mechanism in the manufacturing apparatus of the laminated battery of this invention. FIG. 2A is a plan view showing a state immediately after the separator has been transferred. FIG. 2B is a side view showing a state immediately after the separator has been transferred. FIG.2 (c) is a top view which shows the state which the 2nd nail | claw and the 3rd nail | claw moved. FIG.2 (d) is a side view which shows the state which the 2nd nail | claw and the 3rd nail | claw moved. Explanatory drawing which shows the transfer state of the negative electrode foil in the lamination position holding mechanism in the manufacturing apparatus of the laminated battery of this invention. FIG. 3A is a plan view showing a state immediately after the negative electrode foil has been transferred. FIG. 3B is a side view showing a state immediately after the negative electrode foil has been transferred. FIG.3 (c) is a top view which shows the state which the 1st nail | claw and the 4th nail | claw moved. FIG.3 (d) is a side view which shows the state which the 1st nail | claw and the 4th nail | claw moved. Explanatory drawing which shows the structure of a laminated battery. Explanatory drawing of the manufacturing method of the conventional laminated type battery.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Claw 1a 1st claw 1b 2nd claw 1c 3rd claw 1d 4th claw 2 Shaft 3 Bearing 4 Roller 5 Cylinder 6 Separator 7 Negative electrode foil 8 Positive electrode foil 9 Base 10 Robot 11 Bracket 12 Negative electrode foil 13 Separator 14 Positive electrode foil 15 Positive electrode foil 16 Negative electrode foil 17 Separator 18 Positive electrode extraction terminal 19 Negative electrode extraction terminal 20 Battery assembly jig 20A Insulating material layers 21A and 21B Reference surfaces 22A and 22B Fixing tape hole 23 Fixing tape

Claims (8)

  In a manufacturing method of a stacked battery including a laminate in which a rectangular positive foil and a negative foil are laminated via a separator, the positive foil, the negative foil, and the four corners of the separator, which are respectively operated by a drive unit, are held. Of the four claws, the two positive claws alternately hold the positive foil, the negative foil and the separator at diagonal positions, and stack the positive foil, the negative foil and the separator on a base, A method for producing a laminated battery, comprising forming the laminate.   The method for manufacturing a stacked battery according to claim 1, wherein the claw operates in a direction perpendicular to and parallel to a stacked surface of the base.   The method for manufacturing a stacked battery according to claim 1, wherein the trajectory of the movement of the claw draws an arc or an elliptical arc.   The method for manufacturing a stacked battery according to claim 1, wherein the driving unit is installed below the stacked body.   In a laminated battery manufacturing apparatus including a laminate in which a rectangular positive electrode foil and a negative electrode foil are laminated via a separator, the positive electrode foil, a base on which the negative electrode foil and the separator are laminated, the positive electrode foil, and the negative electrode Four claws for holding the four corners of the foil and the separator, and a drive unit that operates the four claws, respectively, and the positive clad foil, the negative foil, and the four claws by two of the four claws. An apparatus for manufacturing a stacked battery, wherein the separators are alternately held at positions diagonal to each other to form the stacked body.   6. The apparatus for manufacturing a stacked battery according to claim 5, wherein the claw operates in a direction perpendicular to and parallel to the stacked surface of the base.   The stacked battery manufacturing apparatus according to claim 5 or 6, wherein the movement trajectory of the claw draws an arc or an elliptic arc.   The said drive part is installed in the lower part from the said laminated body, The manufacturing apparatus of the laminated battery in any one of Claims 5-7 characterized by the above-mentioned.

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