JP3845283B2 - Laser welding jig for electrode winding body and current collector plate in cylindrical electric double layer capacitor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a laser welding jig for an electrode winding body and a current collector plate in a cylindrical electric double layer capacitor, in particular, a belt-like positive electrode, a belt-like negative electrode, and two belt-like separators sandwiching one of them. A superposed product in which one end edge along the longitudinal direction of the strip-shaped current collector foil and the other end edge along the longitudinal direction of the strip-shaped current collector foil in the strip-shaped negative electrode are respectively projected from both end edges along the longitudinal direction of both strip-shaped separators. A spirally wound electrode winding body, and two current collector plates each welded to both connecting portions by winding the other end edge along the longitudinal direction of both current collector foils The present invention relates to a jig for obtaining a body.
[0002]
[Related technologies]
At present, electric double layer capacitors are highly expected as clean power sources for automobiles. In order to cope with the mass production of the electric double layer capacitor, it is important to improve the productivity of the joined body. For this purpose, a suitable laser welding jig is indispensable.
[0003]
[Problems to be solved by the invention]
This type of jig has a good current collection work in order to improve the positioning work efficiency, the workability of assembling the electrode winding body and both current collector plates, and the yield of the joined body. Before laser welding the plate to the connection, it is required that the same state as after welding appears and it can be confirmed that there is no contact between the positive and negative current collector foils at each connection, that is, no short circuit has occurred. The
[0004]
[Means for Solving the Problems]
It is an object of the present invention to provide the laser welding jig that can satisfy the requirements and is suitable for improving the productivity of the joined body.
[0005]
In order to achieve the above object, according to the present invention, a first cylindrical body having an end wall having an opening at one end and a welding work hole for irradiating a laser beam at the other end, and the first cylinder at one end. A second cylindrical body having an opening that matches the opening of the cylindrical body, an end wall having a welding work hole for irradiating a laser beam at the other end, and both openings of the first and second cylindrical bodies; The one current collector plate is pressurized by the one end wall to one of the connection portions of the electrode winding body placed in them, and the other connection portion has the other current collector. Electrically insulates the connecting member that connects the first and second cylindrical bodies with the electric plate pressed by the other end wall, and the first and second cylindrical bodies that are in a connected state. An electrode winding body and a current collector plate in a cylindrical electric double layer capacitor Laser welding jig is provided.
[0006]
When the first and second cylindrical bodies configured in a two-divided manner as described above are combined and the electrode winding body and both current collector plates are held therein, the electrode winding body for the jig, etc. Assembling workability is improved. In addition, both current collector plates are pressed against both connecting portions by both end walls, and thus both cylindrical bodies, and the pressed state is held by a connecting member, so that both current collector plates can be securely attached to both connecting portions. it can.
[0007]
Since laser welding is performed in the pressure holding state, the pressure holding state is almost the same as that after laser welding. In addition, since the two cylinders are electrically insulated, by measuring the resistance between the current collector plates before laser welding, contact between the positive and negative current collector foils, especially at the two connections The presence or absence of a short circuit can be checked.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2, a cylindrical electric double layer capacitor 1 has a cylindrical sealed container 2 in which an electrode winding body 3, two disk-shaped current collector plates 4, 5 and an electrolytic solution are accommodated. Has been.
[0009]
As shown in FIG. 3, the electrode winding body 3 is configured as follows. That is, the strip-shaped positive electrode 6, the strip-shaped negative electrode 7, and one of them, in the embodiment, two strip-shaped separators 8 and 9 sandwiching the strip-shaped positive electrode 6, and one end of the strip-shaped positive electrode 6 along the longitudinal direction of the Al strip-shaped current collector foil 10. A superposition product in which the other end edge portion 11b along the longitudinal direction of the Al strip-shaped current collector foil 11 in the edge portion 10a and the strip-like negative electrode 7 is protruded from both edge portions along the longitudinal direction of both the strip-like separators 8 and 9, respectively. The belt-shaped positive electrode 6 is wound in a spiral shape around an Al core 12 so that one strip-shaped separator 8 located inside the strip-shaped positive electrode 6 is positioned on the innermost side. In this case, the other strip separator 9 existing between the strip-shaped positive and negative electrodes 6 and 7 extends from the end of the strip-shaped negative electrode 7 by approximately one turn so as to cover the outermost strip-shaped negative electrode 7.
[0010]
In the belt-like positive and negative electrodes 6 and 7, a pair of polarizable electrodes 13 are laminated on both surfaces of the belt-like current collecting foils 10 and 11, respectively. However, in both current collector foils 10 and 11, there is no electrode on the one and the other end edges 10a and 11a along the longitudinal direction protruding from both separators 8 and 9, and both end edges 10a and 11a are The connecting portions 14 and 15 with the current collector plates 4 and 5 are formed by winding.
[0011]
As shown in FIGS. 1, 2, and 4, the sealed container 2 includes an Al-bottomed cylindrical main body 2 a and a lid 16 that closes its opening, and the lid 16 is configured as follows. The lid 16 has an Al alloy short cylindrical body 17, one end of which is fitted into the opening of the cylindrical main body 2 a, and an annular protrusion 18 existing on the outer peripheral surface in the vicinity of the one end is laser welded to the cylindrical main body 2 a. Is done. Further, an outer peripheral groove 21 of an annular plate 20 made of an electrically insulating resin is fitted into an annular protrusion 19 existing on the inner peripheral surface in the vicinity of one end of the short cylindrical body 17, and an Al alloy is formed in an inner peripheral groove 22 of the annular plate 20. An annular protrusion 24 existing on the outer peripheral surface of the cylindrical positive terminal 23 is fitted.
[0012]
As shown also in FIG. 5, in one Al alloy disk-shaped current collector plate 4, the boss 26 at the center is inserted into the center hole 27 of the cylindrical positive terminal 23 and laser welded thereto. Further, the disk portion 28 has a plurality of concave stripes 29 that are arranged radially and project downward, and in the embodiment, have six U-shaped cross sections. Laser welding is performed in a crushed state.
[0013]
In this laser welding, the current collector plate 4 is applied to the connection portion 14 of the electrode winding body 3 as shown in FIG. 6, and then the current collector plate 4 is directed to the connection portion 14 as shown in FIG. Under pressure, the bottom of each recess 29 is squeezed into the connecting portion 14 while crushing it. In this state, the bottom of the recess 29 is irradiated with a laser beam from the opening side of the recess 29 and the bottom of the connecting portion 14. The corresponding part is melted and joined. The reason for crushing the connecting portion 14 in this way is as follows. That is, when a single foil is irradiated with a laser beam, the molten metal flows out and cannot be joined to the bottom, but if the foil is overlapped by crushing, the molten metal is removed from the vicinity of the recess 29. It can be fused with the molten metal at the bottom.
[0014]
As shown in FIG. 8, in the other Al alloy disk-shaped current collector plate 5, the boss 30 at the center of the bottomed cylindrical main body 2a, which is the negative electrode terminal 32, is also shown in FIG. It is inserted into the center hole 33 in the bottom wall and laser welded. The disk portion 34 has a plurality of ridges 35 that are arranged radially and protrude upward, and in the embodiment, have six ridges 35 having an inverted U-shaped cross section. The part 15 is laser welded in a crushed state for the same reason as described above. An annular protrusion 36 surrounding the center hole 33 exists on the outer surface of the bottom wall.
[0015]
Both the disk portions 28 and 34 of the positive current collector 4 and the negative current collector 5 have the same shape, and are used for passing the electrolyte between the adjacent ridges 29 and between the ridges 35. A through hole 37 is formed.
[0016]
The electrolytic solution is injected into the sealed container 2 from the injection hole 38 formed in the boss 30 of the negative electrode side disk-shaped current collector plate 5, and then the injection hole 38 is sealed with a rubber stopper (not shown).
[0017]
When the electric double layer capacitor 1 is assembled, as shown in FIG. 10 (see also FIGS. 6 and 7), the electrode winding body 3 and the current collector plates 4 and 5 are connected to each other. 14 and 15 are used as a joined body 39 obtained by laser welding the current collector plates 4 and 5 respectively.
[0018]
Hereinafter, a laser welding jig used to obtain the joined body 39 will be described.
[0019]
11 to 15, the jig 40 includes a first cylindrical body 41, a second cylindrical body 42 that coaxially matches the first cylindrical body 41, and the first and second cylindrical bodies 41, 42. And a means for electrically insulating the first and second cylindrical bodies 41 and 42 in the connected state.
[0020]
The first cylindrical body 41 is made of synthetic resin so as to embody the electrical insulation means, and has a hollow cylindrical body 44 that is open at both ends, and an opening at one end of the hollow cylindrical body 44. And an end plate 45 which is attached so as to cover the end wall and constitutes an end wall. The hollow cylindrical main body 44 has a narrow annular end surface 46 at one end thereof, a large annular projecting portion 47 projecting from the inner peripheral side thereof, and a wide annular end surface 48 at the other end thereof, It has an annular small-diameter protruding portion 49 protruding from the inner peripheral side thereof. The annular small-diameter protrusion 49 forms the opening 50 of the first cylindrical body 41.
[0021]
An end plate 45 is fitted into an annular recess 51 existing on the inner peripheral side of the large-diameter protrusion 47 and fixed to the large-diameter protrusion 47 by a plurality of small screws 52. As clearly shown in FIG. 11, the end plate 45 has a center hole 53 that can receive the bosses 26, 30 of the current collector plates 4, 5, and extends radially from the center hole 53. In order to match the six slot-shaped welding work holes 54 that can be matched with the concave ridges 29 and the convex ridges 35, the respective welding work holes 54, and the respective concave ridges 29 and the respective ridges 35, the center hole 53, two positioning holes 55 formed on both sides of the positioning hole 53, and two positioning pins 56 fitted into the positioning holes 55, respectively. Both positioning pins 56 are inserted into the two through holes 37 at the positions where the bosses 26 and 30 are sandwiched between the current collecting plates 4 and 5. Each welding work hole 54 is used to irradiate each concave strip 29 and each convex strip 35 of each current collector plate 4, 5 with a laser beam. The second cylindrical body 42 is made of a synthetic resin like the first cylindrical body 41, and covers the opening at one end of the hollow cylindrical main body 57 that is open at both ends. And an end plate 45 having the same structure as described above. The hollow cylindrical main body 57 has a narrow annular end surface 58 at one end thereof, a large annular projection 59 projecting from the inner peripheral side thereof, and a wide annular end surface 60 at the other end, It has an annular small-diameter recess 61 that falls from its inner peripheral side. The annular small-diameter recess 61 forms an opening 62 of the second cylindrical body 42 by the annular bottom inner peripheral portion.
[0022]
An end plate 45 is fitted into an annular recess 63 existing on the inner peripheral side of the large-diameter protruding portion 59 and fixed to the large-diameter protruding portion 59 by a plurality of small screws 52. The sizes of the large-diameter protruding portion 59, the narrow annular end surface 58, and the annular recess 63 are the same as those 47, 46, and 51 in the first cylindrical body 41, respectively. The annular small-diameter recess 61 is in a fitting relationship with the annular small-diameter protrusion 49 of the first cylindrical body 41, but the depth of the recess 61 is greater than the height of the protrusion 49.
[0023]
One positioning pin 64 is provided on the second cylindrical body 42 so as to protrude from the wide annular end surface 60 thereof. On the other hand, the first cylindrical body 41 is provided with one positioning hole 65 so as to open to the wide annular end surface 48 thereof. By fitting the positioning hole 65 and the positioning pin 64, the cylindrical bodies 41 and 42 are positioned relative to each other, and the welding work holes 54 and the positioning pins 56 of the both end plates 45 are aligned.
[0024]
Moreover, as the connection member 43 which connects between the 1st, 2nd cylindrical bodies 41 and 42, as shown in FIG.14, 15, the simple connection metal fitting using a toggle mechanism is used. The connecting member 43 includes a member main body 69 having a movable side engaging claw 68 disposed on a flat surface portion 66 of the outer peripheral surface of the second cylindrical body 42 via an Al alloy mounting base 67, and the first cylindrical body 41. It consists of a fixed-side engaging claw 72 disposed on an outer peripheral flat surface portion 70 via an Al alloy mounting base 71. In the member main body 69, it has a support body 74 fixed to the mounting base 67 and having a pair of rising portions 73, and a support shaft 75 erected on the compatible rising portion 72 on both side plate portions 77 of the operation element 76. One end side is rotatably attached. Long holes 78 are formed on the other end sides of the both side plate portions 77, and both end portions of a movable engagement hole 68 having a U-shape are rotatably attached to a sliding shaft 79 installed in the long holes 78. . A retainer portion 80 is formed as a part of the operation element 76 so as to be positioned between the both side plate portions 77 on the support shaft mounting portion side of the both side plate portions 77. Two coil springs 82 are held in a compressed state between the shaft 79 and the retainer portion 81 integrated.
[0025]
In FIGS. 11, 12, and 13, the laser welding nozzle moves along the longitudinal direction of one welding work hole 54, and after welding one welding work hole 54, In order to perform the welding operation on the welding work hole 54, the jig 40 must be rotated by 60 °. Therefore, the jig 40 is erected on a holding member 84 attached to the chuck 83 of the rotating device. The holding member 84 includes a cylindrical portion 86 having a shallow concave portion 85 that opens upward, and a flange portion 87 existing on the outer periphery thereof. The flange portion 87 sandwiches the center and protrudes from the annular end surface. Two positioning pins 88 are provided. Correspondingly, two positioning holes 89 are formed in the first and second cylindrical bodies 41 and 42 so as to open to the narrow end faces 46 and 58 with the axis therebetween.
[0026]
In manufacturing the joined body 39, in FIGS. 13 and 16, first, the second cylindrical body 42 which is not connected to the first cylindrical body 41 is operated with its annular large-diameter protruding portion 59 on the lower side. Standing on a table, the current collector plate 5 on the negative electrode side is inserted into the second cylindrical body 42 from the opening 62 with the boss 30 facing downward, for example, by tweezers, and the boss 30 is inserted into the end plate 45. The two through holes 37 are fitted into the two positioning pins 56. Thereby, each welding work hole 54 and each protruding item | line 35 correspond. Next, the electrode winding body 3 is placed in the second cylindrical body 42, one connection portion 15 is applied to the current collector plate 5, and the positive current collector plate 4 is placed on the other connection portion 14 of the electrode winding body 3. The first boss 41 is placed on the electrode winding body 3 and the current collector plate 4 so that the center hole 53 of the end plate 45 is fitted to the boss 26, and the second cylindrical body 42 is mounted. The positioning hole 65 of the first cylindrical body 41 is fitted to the positioning pin 64, and the annular small-diameter protruding portion 49 is fitted into the annular small-diameter concave portion 61 so that the openings 50 and 62 are aligned. The two through holes 37 are fitted to the two positioning pins 56 by moving as necessary, and the respective welding work holes 54 and the respective concave stripes 29 are matched. In this state, the connecting portions 14 and 15 are hardly crushed, and the wide annular end surface 48 of the first cylindrical body 41 is not in contact with the wide annular end surface 60 of the second cylindrical body 42.
[0027]
Therefore, the movable side engaging claws 68 of the respective connecting members 43 are engaged with the fixed side engaging claws 72, and then the operation element 76 is rotated in a clockwise direction in FIG. , The first and second cylindrical bodies 41 and 42 are connected as shown in FIG. Thus, the current collector plate 4 existing between the positive electrode side connection portion 14 and the end plate 45 is connected to the connection portion 14, and the current collector plate 5 existing between the negative electrode side connection portion 15 and the end plate 45 is connected to the connection portion 15. By being pressurized, each concave line 29 and each convex line 35 bite into the connection parts 14 and 15 and the connection parts 14 and 15 are crushed.
[0028]
In this state, the resistance between the bosses 26 and 30 of the current collector plates 4 and 5 is measured. In this case, for example, if there is a short circuit such as contact between the positive and negative current collector foils 10 and 11 at both the connecting parts 14 and 15, it is possible to know that the resistance value decreases.
[0029]
When no short circuit occurs, for example, as shown in FIG. 12, the annular large-diameter protruding portion 59 of the second cylindrical body 42 is fitted into the concave portion 85 of the holding member 84 and the positioning holes 89 are formed in the positioning pins 88. Fit each one. Thus, one welding work hole 54 on the positive electrode side is positioned with respect to the laser welding nozzle.
[0030]
A laser beam is irradiated to the bottom wall of the concave strip 29 of the current collector plate 4 from the laser welding nozzle through the welding work hole 54, and the bottom wall and the connection portion 14, and thus the overlapping current collector foils are welded. Thereafter, the jig is intermittently rotated to 60 °, and laser welding is performed in the same manner as described above.
[0031]
After the laser welding on the positive electrode side is completed, the jig 40 is turned upside down and laser welding is performed on the negative electrode side in the same manner as the positive electrode side. In this case, the protruding amount of the boss 26 in the positive current collecting plate 4 is large, but the tip end side from the end plate 45 is received in the through hole 90 formed in the bottom wall of the holding member 84.
[0032]
【The invention's effect】
According to the present invention, the construction as described above makes it possible to improve the assembly workability of the electrode winding body and both current collector plates and improve the positioning work efficiency. In a cylindrical electric double layer capacitor that can be securely attached to both connecting parts of a rotating body, and that the yield of the bonded body can be improved by checking for short-circuits in the electrode winding body before laser welding. It is possible to provide a jig for laser welding between the electrode winding body and the current collector plate.
[Brief description of the drawings]
FIG. 1 is a front view of a cylindrical electric double layer capacitor.
FIG. 2 is a sectional view taken along line 2-2 of FIG.
FIG. 3 is a fragmentary perspective view for explaining a structure of an electrode winding body.
4 is a view taken in the direction of arrow 4 in FIG.
FIG. 5 is a perspective view when a disc-shaped current collector on the positive electrode side is viewed from above.
FIG. 6 is a partial front view showing a state in which a current collector plate is placed on a connection portion.
FIG. 7 is a partial front view showing a state in which a connection portion is crushed through a current collector plate.
FIG. 8 is a perspective view of the negative electrode disc-shaped current collector plate as viewed from below.
FIG. 9 is a view taken along arrow 9 in FIG. 1;
FIG. 10 is a front view of a joined body.
11 is a plan view of the jig and corresponds to a view taken in the direction of arrow 11 in FIG.
12 is a sectional view taken along line 12-12 of FIG.
FIG. 13 is an exploded perspective view of a jig in which a connecting member is omitted.
FIG. 14 is an enlarged side view of the connecting portion of the jig.
FIG. 15 is an enlarged perspective view of a connecting portion of a jig.
16 is a cross-sectional view showing a state in which the electrode winding body and both current collector plates are assembled to a jig, and corresponds to FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ......... Cylinder-type electric double layer capacitor 3 ............... Wound bodies 4,5 ......... Disc-shaped current collector plate 6 ............... Strip-shaped positive electrode 7 ............... Strip-shaped negative electrode 8 , 9... Strip separators 10 and 11... Strip current collector foil 10 a... One end edge portion 11 a. 43 ………… Connecting member 45 ………… End plate (end wall)
50 ………… Opening 54 ………… Welding work hole 62 ………… Opening

Claims (1)

One end of the strip-shaped positive electrode (6), the strip-shaped negative electrode (7), and two strip-shaped separators (8, 9) sandwiching one of them, and the strip-shaped positive electrode (6) along the longitudinal direction of the strip-shaped current collector foil (10) The other end edge (11a) along the longitudinal direction of the strip-shaped current collector foil (11) in the edge portion (10a) and the strip-shaped negative electrode (7), respectively, both end edges along the longitudinal direction of the strip-shaped separators (8, 9) And the other end edge (10a, 11a) along the longitudinal direction of the strip-shaped current collector foil (10, 11). ) Is a jig for obtaining a joined body (39) having two current collector plates (4, 5) each laser welded to both connection portions (14, 15) by winding of Part (50), welding work hole (54 for irradiating the other end with a laser beam) A first cylindrical body (41) each having an end wall (45) having an opening, an opening (62) matching the opening (50) of the first cylindrical body (41) at one end, and a laser at the other end. A second cylindrical body (42) having end walls (45) each having a welding work hole (54) for irradiating a beam, and both openings (50) of the first and second cylindrical bodies (41, 42). 62) and the one current collector plate (4) to the one end wall (45) to one of the connection portions (14) of the electrode winding body (3) placed inside them. ) And the first and second cylindrical bodies (41, 4) in a state where the other current collector plate (5) is pressurized to the other connecting portion (15) by the other end wall (45). 42) between the connecting member (43) connecting the two and the first and second cylindrical bodies (41, 42) in the connected state. And having a means for insulating, the cylindrical electric double electrode winding body in layer capacitor and laser welding jig with the current collector plate.

Images