JP2006004687A - Manufacturing method and manufacturing device of lamination type secondary battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method and a manufacturing device for lamination type secondary battery in which adhesion strength is stabilized and manufacturing time is shortened. <P>SOLUTION: In the manufacturing device 10 for lamination type secondary battery, the peripheral portions of two sheets of laminated outer package 3 interposing a generating element are overlapped and while pressurizing and interposing the peripheral portions, they are heated and sealed by adhesion. At least one of the pair of pressing members 11, 12 which interpose the peripheral portions is a laser transmitting pressing member 12, and the manufacturing device 10 is provided with a laser irradiation means 13 for irradiating laser beams on the peripheral portion through the laser transmitting pressing member 12 and a pressurizing means for pressurizing and interposing the peripheral portion to the pressing member. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a battery in which a power generation element is stored in a laminate film (hereinafter referred to as “laminated secondary battery”) and a manufacturing apparatus therefor, and more specifically, the sealing portion of the laminate film has a high strength. The present invention relates to a manufacturing method and a manufacturing apparatus for a laminate type secondary battery having a stable welding structure.

In recent years, laminated secondary batteries have attracted attention as power sources for not only electronic devices such as portable PCs and mobile phones, but also hybrid vehicles and electric vehicles. This laminate type secondary battery is manufactured through steps such as sealing a power generation element with a laminate film as a laminate outer package, and then injecting an electrolyte at room temperature.
As shown in FIG. 8, the laminated secondary battery includes a power generation element 110 and a pole terminal 111 in contact with the power generation element 110, and these are sandwiched from above and below by two laminate films 101. The power generation element 110 is formed in a flat shape by being wound with a separator sandwiched between bipolar sheets. The electrode terminal 111 is disposed so as to protrude from the laminate film 101. In the laminate film 101 in which the resin is coated on both surfaces of the metal foil, the periphery of the sandwiched power generation element 110 is sealed by heat welding.

In the manufacture of such a laminate type secondary battery, conventionally, when sealing the periphery of the laminate film, for example, a method described in Patent Document 1 below has been employed. 9 and 10 are diagrams showing the welding method described in the publication. This shows the production of a flat battery, and the surrounding heat welding is also used for welding a laminate film of a laminated secondary battery.
Here, the resin layer 122 is provided on the peripheral edge of the positive terminal plate 121, the positive electrode 131 is disposed on the trapezoidal portion, and the separator 132 and the negative electrode 133 are laminated thereon. The power generation element 130 is configured by the positive electrode 131, the separator 132, and the negative electrode 133. Further, a negative electrode terminal plate 124 provided with a resin layer 123 at the peripheral edge is overlaid thereon.

The laminated positive electrode terminal plate 121 and negative electrode terminal plate 124 are sandwiched between a lower mold 140 and a heating body 150 as an upper mold, and pressed with a predetermined pressure. Then, a current is passed through the heating element 150 and heated to 250 ° C., the resin layers 122 and 123 are melted, and the peripheral edge is welded. Thereafter, the heating is stopped and the resin layers 122 and 123 are cooled and solidified by the air injected from the low temperature air injection devices 160 and 170 while maintaining the pressurized state of the lower mold 140 and the heating body 150.
Therefore, even in the method for manufacturing a laminate type secondary battery, when the laminate film is sealed, the peripheral portion of the laminated laminate film 101 is similarly sandwiched between the lower mold 140 and the heating body 150 and heated. It cools after both sides to weld.
JP-A-1-213955 (page 3, FIGS. 1 and 2)

  In such a conventional method for manufacturing a laminated secondary battery, the low-temperature air injection devices 160 and 170 are used as cooling means. However, since the welded portion is kept pressed by the heating body 150 having the heat immediately after the heating at the time of cooling, the low-temperature air injection devices 160 and 170 simultaneously cool the heating body 150 in order to cool the resin layers 122 and 123. It had to be cooled and the energy loss was great. Therefore, even if the low-temperature air injection devices 160 and 170 are used, it is difficult to instantaneously cool the resin layers 122 and 123 including the heating body 150. And such a delay in cooling has caused a decrease in productivity.

  Therefore, in order to improve productivity, it is conceivable that after the heat welding, the pressing by the heating body 150 is released, and the welded portion having the resin layers 122 and 123 is cooled by the low-temperature air jet devices 160 and 170. However, in this case, the resin layer after melting is in an open state, and when cooling is performed in this state, the molten resin layer is still peeled off or swollen. In this case, the stability of the final shape of the welded portion is deteriorated, and the thickness is varied to cause a decrease in strength. This is because the welding strength of the laminate film greatly depends on the welding thickness. Therefore, the management of the thickness of the welded portion of the laminate film is the most important point in managing the welding strength. If the thickness varies, the pressure resistance performance of the product cannot be guaranteed.

From this, it is conceivable to pressurize with a cooling pressing member instead of the heated body 150, but opening the resin layer immediately after melting causes the resin layer to swell even if the opening is temporary. It will solidify in the state where it has been. Therefore, replacement with a cooling pressing member is not a preferable method because the thickness of the welded portion of the laminate film becomes insufficiently controlled and the stability of the final shape is impaired.
In view of the above, in the conventional method of manufacturing a laminate type secondary battery, instantaneous cooling is performed to improve productivity, and the pressure state after welding is maintained to obtain a high quality product. It is desired to stabilize the shape.

  Accordingly, an object of the present invention is to provide a manufacturing method and a manufacturing apparatus of a laminate type secondary battery that stabilizes the welding strength and shortens the manufacturing time in order to solve such problems.

The method for manufacturing a laminate type secondary battery according to the present invention includes a method in which the peripheral portions of two laminate outer bodies sandwiching a power generation element are overlapped, and the peripheral portions are pressed and sandwiched by heat welding in a state of being sandwiched. A heating step of sandwiching at least one surface of the peripheral portion with a laser transmitting member and irradiating a laser beam through the laser transmitting member to melt the peripheral portion, and after the heating step. A cooling step of cooling the peripheral edge by continuing to sandwich the peripheral edge by the laser transmitting member.
In addition, the method for manufacturing a laminate type secondary battery according to the present invention is characterized in that a peripheral portion of the laminate outer package is sandwiched between a pair of laser transmissive members and laser light is irradiated from both sides.

An apparatus for manufacturing a laminate type secondary battery according to the present invention is a method in which a peripheral portion of two laminate outer bodies sandwiching a power generation element is overlapped, and the peripheral portion is pressed and sandwiched by heat welding in a state of being sandwiched. And at least one of a pair of pressing members sandwiching the peripheral portion is a laser transmissive pressing member, and a laser irradiation means for irradiating the peripheral portion with laser light through the laser transmissive pressing member; And pressurizing means for pressurizing and sandwiching the peripheral edge portion with respect to the pressing member.
Further, in the laminate type secondary battery manufacturing apparatus according to the present invention, both of the pair of pressing members sandwiching the peripheral edge portion are laser transmitting pressing members, and the laser irradiation means is applied to both laser transmitting pressing members. Is provided.

Also, in the laminated secondary battery manufacturing apparatus according to the present invention, the laser irradiating means lays out a high-power semiconductor laser and irradiates a laser beam having a shape matching the peripheral edge of the laminated outer package. It is characterized by being.
In the laminated secondary battery manufacturing apparatus according to the present invention, the laser-transmitting pressing member and the laser irradiating means are stacked, and the laser-transmitting member is formed with a uniform thickness. It is characterized by that.
Moreover, in the apparatus for manufacturing a laminate type secondary battery according to the present invention, the pressing member is a part of which is cut off, or a part of which a groove having a predetermined depth is formed. It is characterized by.

Further, in the laminated secondary battery manufacturing apparatus according to the present invention, the laser-transmitting pressing member is formed wider than the laser irradiation means placed thereon, and is supported by a portion protruding from the laser irradiation means. Alternatively, the force from the pressurizing means is transmitted at a portion protruding from the laser irradiation means.
In the laminate type secondary battery manufacturing apparatus according to the present invention, the laser transmissive pressing member is formed of a laser transmissive glass.

  Therefore, according to the method and apparatus for manufacturing a laminated secondary battery according to the present invention, the peripheral edge of the laminate outer package is pressed with a laser-transmitting pressing member, and the laser beam transmitted through the laser-transmitting pressing member is used. Heat welding. That is, the laser transmissive pressing member functions as a pressurizing unit from the heating step to the subsequent cooling step and also functions as a cooling unit. Therefore, since the peripheral edge part which becomes a sealing part can be pressed down continuously, the thickness of the welding part can be reduced, the welding strength can be stabilized, and the pressure resistance performance of the product can be guaranteed. Further, by functioning as a cooling means, the cooling time can be shortened, that is, the manufacturing time can be shortened.

  Further, in the laminate type secondary battery manufacturing apparatus according to the present invention, the laser irradiation means is formed by laminating high-power semiconductor lasers. Therefore, a complicated and small optical system is not required, and a small and simple configuration can be obtained. In addition, since the laser beam is irradiated to the seal portion at a time, heat welding can be performed in a short time. Further, by making the thickness of the laser transmissive member uniform, it is possible to perform laser irradiation while maintaining a stable focal length.

Next, an embodiment of a method and apparatus for manufacturing a laminated secondary battery according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a laminated secondary battery.
In the laminated secondary battery 1 of the present embodiment, the power generation element 2 is housed in a laminate film 3. The power generation element 2 is obtained by winding a positive electrode sheet and a negative electrode sheet together with a separator and winding them. Specific examples of the members constituting the power generating element 2 include, for example, lithium cobaltate as a positive electrode sheet, a graphitized carbon material as a negative electrode sheet, a resin such as polyethylene as a separator, and a lithium salt as an electrolyte. Is an organic solvent in which is dissolved.

  Here, FIG. 2 is a view showing a cross-section of the heat-laminated laminate film 3. The laminate film 3 has an aluminum layer 32 as a substrate, coated with an adhesive layer (PP layer) 13 such as PP on the welding surface side, and a surface protective layer (nylon layer) 11 such as polyamide on the opposite surface side. Has been. The laminate film 3 is formed by superimposing PP layers 33 and melting and bonding them together. And the positive electrode terminal 5 and the negative electrode terminal 6 protrude from the peripheral part 3a of the laminate film 3 welded so as to wrap the power generation element 2.

  Further, a safety valve portion 7 is provided in part on the seal portion of the laminate film 3. When the pressure in the laminate film 3 reaches a predetermined value (for example, 0.55 ± 0.1 MPa in this embodiment), the safety valve portion 7 has a structure that opens when the seal is broken. When the battery is overcharged, the laminate film 3 is filled with the decomposition gas of the electrolytic solution, and the pressure in the laminate film 3 is increased. Therefore, when the inside of the laminate film 3 rises to a predetermined pressure, the gas filled inside is determined, that is, the safety valve portion 7 is discharged. The released gas can be recovered appropriately.

In order to manufacture the laminate type secondary battery 1, first, a power generation element 2 in which a positive electrode sheet and a negative electrode sheet and a separator are overlapped and wound into a flat shape is prepared. The positive terminal 5 is attached to the positive electrode sheet, and the negative terminal 6 is attached to the negative electrode sheet. The power generation element 2 is sandwiched between two laminate films 3, and the peripheral edge 3a of the laminate film 3 is sealed by heat welding. As a result, the power generating element 2 is housed in the laminate film 3.
However, only the part which becomes the safety valve part 7 is in an open state without being welded. This is because the electrolytic solution is injected into the bag-like laminate film 3 from the opening. When the electrolytic solution is injected, the opening is closed by heat welding and becomes the safety valve 7. After that, conditioning as a storage battery by charging and discharging is performed, and the laminated secondary battery 1 is completed.

Here, FIG. 3 is a perspective view conceptually showing the laminated secondary battery manufacturing apparatus of the first embodiment.
A laminated secondary battery manufacturing apparatus 10 includes a lower mold 11 which is a lower pressing member on which two laminate films 3 stacked with a power generation element 2 (not shown) interposed therebetween, and the lower mold 11. A pressing block 12 is provided between which the peripheral edge portion 3 a of the laminate film 3 is sandwiched, and a heating unit 13 is placed on the pressing block 12. The lower mold 11, the pressing block 12, and the heating unit 13 have a square C shape in accordance with the shape of the peripheral edge portion 3 a of the laminate film 3 excluding the safety valve portion 7. The upper surface of the lower mold 11 and the lower surface of the pressing block 12 are formed as flat surfaces so that the sandwiched laminate film 3 can be pressed with an equal force.

  In the laminate type secondary battery manufacturing apparatus of the present embodiment, a semiconductor laser is used as the heating means. Therefore, the heating unit 13 is configured by integrating semiconductor lasers. As the semiconductor laser constituting the heating unit 13, for example, a high-power semiconductor laser manufactured by Nippon Steel Technoresearch Corporation is used. Here, FIGS. 4 and 5 are perspective views showing the structure of the heating unit 13 constituted by the high-power semiconductor laser.

  As shown in FIG. 4, the heating unit 13 has a laser diode bar 51 as a basic structure, and the laser diode bar 51 is paired with a heat sink 52. A plurality of laser beams 50 are emitted from the laser diode bar 51 at equal intervals from the emission end face as shown in the figure. The output laser beam 50 spreads as it propagates. However, since the beam shape of the laser beam 50 in the vicinity of the emission end is preserved, the beam can be arbitrarily compared with the case where it is condensed using a lens or the like. The shape can be designed.

  A plurality of laser diode bars 51 paired with the heat sink 52 are stacked to form a laser diode array 53 as shown in FIG. Accordingly, the laser diode array 53 emits laser light 50 having a shape formed by superimposing a plurality of laser diode bars 51 as shown in the figure. That is, the laser diode array 53 shown in FIG. 5 has a rectangular shape in which three laser diode bars 51 are stacked, and the laser light 50 is also irradiated in a rectangular shape according to the shape.

In the heating unit 13, a plurality of laser diode bars 51 paired with a heat sink 52 are stacked, and a laser diode array 53 is formed in the shape shown in FIG. Therefore, the laser beam 50 is irradiated from the heating unit 13 in a square C shape that matches the shape of the peripheral edge portion 3 a of the laminate film 3 excluding the safety valve portion 7.
On the other hand, the pressing block 12 is formed of laser transmissive glass so that the laser light 50 irradiated from the heating unit 13 is transmitted and the lower laminate film 3 is heated. The pressing block 12 is formed to have a uniform thickness over the whole so that the irradiation distance from the heating unit 13 to the laminate film 3 is uniform.

  Next, FIG. 6 is a diagram conceptually showing the manufacturing process of the laminated secondary battery. In the manufacturing apparatus 10, the lower mold 11, the pressing block 12, and the heating unit 13 are overlapped as described above. It is configured to be performed by a cylinder 15 which is a pressure unit. That is, the pressing block 12 is formed wider on the outside than the heating unit 13 mounted thereon, and the cylinder 15 is connected to the pressing block 12 so that no load is applied to the heating unit 13.

  By the way, the force from the cylinder 15 needs to be applied evenly to the peripheral edge portion 3 a of the laminate film 3 through the pressing block 12. Accordingly, the arrangement of the cylinder 15 and the connection between the cylinder 15 and the pressing block 12 are taken so that force is equally applied from the cylinder 15 to the pressing block 12. However, in the manufacturing apparatus 10 shown in FIG. 6, it is shown for convenience so that the operation of the cylinder 15 can be understood without considering this point. That is, in this example, a pair of cylinders 15 are vertically arranged and arranged on the left and right, and they are configured to move the pressing block 12 up and down and press against the lower mold 11 by the expansion and contraction operation of the piston rod. Yes. The heating unit 13 is mounted on the pressing block 12 and moves up and down according to the expansion and contraction operation of the cylinder 15.

Therefore, according to the manufacturing apparatus 10 configured in this way, the manufacturing method of the laminated secondary battery, in particular, the welding of the laminated film 3 is performed as follows.
In order to manufacture the laminate type secondary battery 1 shown in FIG. 1, as described above, the power generation element 2 is prepared, and the positive electrode terminal 5 and the negative electrode terminal 6 are respectively attached to the electrode sheet. Sandwiched. Laminate films 3 are each formed with a dent in the upper or lower direction, leaving the peripheral edge 3a, and the power generation element 2 is placed there. In the manufacturing apparatus 10, as shown in FIG. 6A, the laminate film 3 is stacked one above the other, and the peripheral edge 3 a is placed on the lower mold 11. At this time, the pressing block 12 and the heating unit 13 are waiting at an upper position by the cylinder 15 in an expandable state.

Next, the cylinder 15 is extended, and the pressing block 12 and the heating unit 13 are lowered as shown in FIG. Then, the pressing block 12 receiving the force from the cylinder 15 pressurizes and sandwiches the peripheral edge portion 3 a of the laminate film 3 on the lower mold 11. The laminating film 3 is pressed by the lower mold 11 and the pressing block 12 at the peripheral edge 3a which is a seal portion. Then, the laser beam 50 is irradiated from the heating unit 13 as shown in FIG.
The heating unit 13 is composed of a laser diode array 53 formed by laminating a plurality of laser diode bars 51 as shown in FIG. And since the shape is a square C shape, a laser beam is also irradiated according to the shape, and the peripheral part 3a of the laminate film 3 is heated.

  The laser beam 50 irradiated from the heating unit 13 passes through the laser transmitting glass pressing block 12 and reaches the laminate film 3. As shown in FIG. 2, the cross section of the laminate film 3 is a nylon layer 31, an aluminum layer 32, and a PP layer 33 from the top. Therefore, since the laser light 50 irradiated from the nylon layer 31 side has a small wavelength, it passes through the nylon layer 31 and is absorbed by the aluminum layer 32. Therefore, according to the heating unit 13 using a semiconductor laser as in the present embodiment, the aluminum layer 32 can be efficiently heated because the absorption into the aluminum layer 32 is high. When the aluminum layer 32 is heated, the lower PP layer 33 is melted by heat conduction.

The laser beam 50 is emitted from the heating unit 13 for a certain time. Thereby, in the laminate film 3 in which the aluminum layer 32 is heated, the PP layers 33 of the peripheral edge portion 3a directly superposed are melted and welded to each other.
When heat welding is performed in this manner, in this embodiment, as shown in FIG. 6D, cooling is performed with the pressing block 12 pressed against the lower mold 11 as it is. The laser transmitting glass pressing block 12 passes through the laser even in the heating step of FIG. 6C, so that it remains cooled without being heated.

Therefore, in the subsequent cooling step, the pressing block 12 becomes a heat sink, and the pressing block 12 pressing the peripheral edge portion 3a of the laminate film 3 takes away the heat of welding of the seal portion. Note that the lower lower mold 11 also serves as a heat sink and takes heat of welding from the peripheral edge 3 a of the laminate film 3. Therefore, copper or aluminum having good thermal conductivity is suitable for the lower mold 11.
By this cooling step, the peripheral edge 3a is cooled and solidified, whereby the sealing of the laminate film 3 is completed. After that, as shown in FIG. 6E, the pressing block 12 and the heating unit 13 are raised by the contraction operation of the cylinder 15 to release the pinching.

In this way, the laminate film 3 containing the power generation element 2 is filled with electrolyte from the opened safety valve portion 7, and then the safety valve portion 7 is sealed and charged and discharged to perform conditioning as a storage battery. The laminate type secondary battery 1 is completed.
By the way, the safety valve part 7 needs to reduce welding strength rather than the other peripheral part 3a. Therefore, when sealing the safety valve portion 7, an annular lower mold and a pressing block are prepared so that a shallow step is formed in the safety valve portion 7 so that the load during pressurization is smaller than other portions. To do. As a result, even when heat welding is similarly performed using a semiconductor laser, the thickness of the safety valve portion 7 is increased, and the welding strength is lowered to function as an explosion-proof valve.

As described above, the laminate type secondary battery manufacturing apparatus 10 according to the present embodiment and the method for manufacturing the laminate type secondary battery by the manufacturing apparatus 10 have been described. According to such a manufacturing apparatus and the manufacturing method, the following effects can be obtained. can get.
First, in this embodiment, the peripheral edge 3a of the laminate film 3 is pressurized with a pressing block 12 formed of laser-transmitting glass, and is heat-welded with laser light transmitted through the pressing block 12. In other words, the pressing block 12 functions as a pressure unit as well as a cooling unit from the heating process to the subsequent cooling process. Therefore, since the seal part can be pressed down continuously, the thickness of the welded part can be reduced, the weld strength can be stabilized, and the pressure resistance performance of the product can be guaranteed. Further, the cooling time can be shortened by functioning as a cooling means.

  Further, in the present embodiment, the heating unit 13 is stacked on the pressing block 12, but by making the thickness of the pressing block 12 uniform, the peripheral portion 3 a of the laminate film 3 from the laser head of the laser diode bar 51. The distance up to can be kept constant. Therefore, the laminate film 3 can be irradiated with laser while maintaining a stable focal length. As a result, the seal portion can be sufficiently melted, and the seal portion can be prevented from being wrinkled and uneven, thereby improving airtightness and appearance.

  Furthermore, in this embodiment, the heating unit 13 is assembled by laminating the laser diode bars 51 as shown in FIG. Therefore, the heating unit 13 can be formed into a free shape such as a square C shape as shown in FIG. 3 within a range in which the laser diode bar 51 can be assembled. And since the heating unit 13 can irradiate the laser beam 50 according to the shape, it is not necessary to perform scanning laser irradiation by forming according to the welding shape. Therefore, the manufacturing apparatus 10 according to the present embodiment does not require a complicated optical system for scanning, and can have a small and simple configuration, and also irradiates the seal portion with laser light at one time. Heat welding can be performed in a short time.

  Next, FIG. 7 is a perspective view conceptually showing the laminated secondary battery manufacturing apparatus of the second embodiment. In the embodiment, heat welding was performed by irradiating laser light only from one side of the laminated film 3 that was overlapped. However, the manufacturing apparatus 20 of the present embodiment is configured to perform laser welding by irradiating laser light from both sides.

  In the manufacturing apparatus 20 of the present embodiment, since laser welding is performed by irradiating laser beams from both sides, the same configuration is taken up and down across the laminate film 3. That is, the pressing blocks 21 and 22 are arranged above and below, the upper heating unit 23 is placed on the upper surface of the pressing block 21, and the heating unit 24 is attached to the lower surface of the pressing block 22. The upper and lower pressing blocks 21 and 22 and the heating units 23 and 24 are formed in a square C shape in accordance with the shape of the peripheral edge portion 3a of the laminate film 3 excluding the safety valve portion 7 (see FIG. 1). And the lower surface of the pressing block 21 and the upper surface of the pressing block 22 are formed in a plane so that the peripheral edge part 3a of the sandwiched laminate film 3 can be pressed with an equal force.

  The pressing blocks 21 and 22 are made of laser transmissive glass, and the heating units 23 and 24 are formed by laminating laser diode bars 51 as shown in FIG. The pressing blocks 21 and 22 are formed wider outside the heating units 23 and 24, the pressing block 22 is supported from below so that no load is applied to the heating units 23 and 24, and the pressing block 21 is Similar to the pressing block 12 of the first embodiment, the cylinders are connected so that a force is applied from above by a cylinder.

Therefore, in the manufacturing method of the laminate type secondary battery 1 by the manufacturing apparatus 20, as in the case of the embodiment described with reference to FIG. 6, the peripheral edge portion 3a of the laminated laminate film 3 is heated and welded, and the positive electrode The power generation element 2 is accommodated by protruding the terminal 5 and the negative electrode terminal 6.
At this time, in the present embodiment, the peripheral edge portion 3a of the laminate film 3 is sandwiched between the pressing blocks 21 and 22, and in this state, laser light is irradiated from the heating units 23 and 24 disposed above and below. The laser beams irradiated from the heating units 23 and 24 pass through the pressing blocks 21 and 22 made of laser transmissive glass, respectively, and reach the laminate film 3.

Since the laser light applied to the laminate film 3 has a small wavelength, it passes through the nylon layer 31 shown in FIG. 2 and is absorbed by the aluminum layer 32. Then, when the upper and lower aluminum layers 32 are heated, the PP layer 33 superposed by heat conduction is melted.
After the PP layer 33 is melted and heated and welded, the peripheral edge portion 3a of the laminate film 3 as a seal portion is cooled while being sandwiched between the pressing blocks 21 and 22 as they are. The laser transmitting glass pressing blocks 21 and 22 are still cooled because the laser light is transmitted through the heating process. Therefore, in the cooling process, the upper and lower pressing blocks 21 and 22 serve as heat sinks and take heat of welding from the peripheral edge portion 3a of the laminate film 3 as a seal portion. And the seal | sticker is completed when the welding in the peripheral part 3a of the laminate film 3 cools and solidifies.

As described above, the laminate type secondary battery manufacturing apparatus 20 of this embodiment and the method of manufacturing the laminate type secondary battery by the manufacturing apparatus 20 have been described. According to such a manufacturing apparatus and the manufacturing method, the following effects can be obtained. can get.
That is, since the pressing blocks 21 and 22 function as a pressurizing unit and a cooling unit at the same time from the heating step to the subsequent cooling step, the seal portion can be pressed down continuously. The pressure resistance of the product can be guaranteed by stabilizing the welding strength.

Moreover, in this embodiment, since it heats by irradiating a laser beam from both upper and lower sides, the melting time could be shortened. In addition, since the pressing blocks 21 and 22 cool the sealing portion from above and below, the cooling time can be shortened, and the manufacturing time can be shortened as a whole.
Further, although the heating units 23 and 24 are stacked on the pressing blocks 21 and 22, the peripheral portions 3a of the laminate film 3 from the laser head of the laser diode bar 51 are made uniform by making the thickness of the pressing blocks 21 and 22 uniform. The distance up to can be kept constant. Therefore, the laminate film 3 can be irradiated with laser while maintaining a stable focal length. As a result, the seal portion can be sufficiently melted, and the seal portion can be prevented from being wrinkled and uneven, thereby improving airtightness and appearance.

  Furthermore, the heating units 23 and 24 are assembled by laminating laser diode bars 51 as shown in FIG. Accordingly, since the heating units 23 and 24 formed in the square C shape are irradiated with laser light corresponding to the shape, there is no case of performing scanning laser irradiation by making the welding shape. Therefore, the present manufacturing apparatus 20 does not require a complicated optical system for scanning, and can be configured to be small and simple, and further, since the laser beam is irradiated to the joint portion at a time, the heat welding is performed. It can be done in a short time.

As mentioned above, although one embodiment was shown and demonstrated about the manufacturing method and manufacturing apparatus of the lamination type secondary battery concerning the present invention, the present invention is not limited to this but various in the range which does not deviate from the meaning. It can be changed.
For example, although laser transmissive glass is used as the pressing blocks 12, 21, and 22 in the above embodiment, the present invention is not limited to this as long as it has laser transmission and cooling ability.
Moreover, you may make it actively cool using a low temperature air injection apparatus etc. like a prior art example.

It is the perspective view which showed the lamination type secondary battery. It is the figure which showed the cross section of the laminate film heat-welded. It is the perspective view which showed notionally the manufacturing apparatus of the lamination type secondary battery of 1st Embodiment. It is the perspective view which showed the high output semiconductor laser which comprises a heating unit. It is the perspective view which showed the assembly state of the high output semiconductor laser which comprises a heating unit. It is the figure which showed notionally the manufacturing process of the lamination type secondary battery. It is the perspective view shown notionally of the manufacturing apparatus of the lamination type secondary battery of 2nd Embodiment. It is the figure which showed the cross section of the seal | sticker part of a lamination type secondary battery. It is the figure which showed the manufacturing process for heat-welding the peripheral part of a flat battery. It is the figure which showed the manufacturing process for heat-welding the peripheral part of a flat battery.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminate type secondary battery 3 Laminate film 3a Peripheral part 10 Manufacturing apparatus 11 Lower metal mold 12 Pressing block 13 Heating unit 15 Cylinder 31 Nylon layer 32 Aluminum layer 33 PP layer 50 Laser beam 51 Laser diode bar 52 Heat sink 53 Laser diode array

Claims (9)

In the method of manufacturing a laminate type secondary battery in which the peripheral portions of two laminate outer bodies sandwiching a power generation element are overlapped, and the peripheral portions are pressed and sandwiched while being heat-welded and sealed,
A heating step in which at least one surface of the peripheral portion is sandwiched between laser transmissive members, and the peripheral portion is melted by irradiating laser light through the laser transmissive member;
A cooling step of cooling the peripheral edge by continuing to sandwich the peripheral edge by the laser transmissive member even after the heating step;
A method for producing a laminated secondary battery, comprising: In the manufacturing method of the laminate type secondary battery according to claim 1,
A method for producing a laminate type secondary battery, wherein a peripheral portion of the laminate outer package is sandwiched between a pair of laser transmissive members and laser light is irradiated from both sides. In an apparatus for manufacturing a laminate type secondary battery in which the peripheral portions of two laminate outer bodies sandwiching a power generation element are overlapped, and the peripheral portions are pressed and sandwiched while being heat-welded and sealed,
At least one of the pair of pressing members sandwiching the peripheral portion is a laser transmissive pressing member, a laser irradiating means for irradiating the peripheral portion with laser light through the laser transmissive pressing member, and the pressing member And a pressurizing means for pressurizing and sandwiching the peripheral portion. In the manufacturing apparatus of the laminate type secondary battery according to claim 3,
A pair of pressing members sandwiching the peripheral portion are both laser-transmitting pressing members, and the laser irradiation means is provided for both laser-transmitting pressing members. Battery manufacturing equipment. In the manufacturing apparatus of the laminate type secondary battery according to claim 3 or 4,
The apparatus for manufacturing a laminate type secondary battery, wherein the laser irradiating means is configured such that a high-power semiconductor laser is stacked and irradiated with a laser beam having a shape matched to a peripheral edge of the laminate outer package. . In the manufacturing apparatus of the laminate type secondary battery according to claim 5,
An apparatus for manufacturing a laminate type secondary battery, wherein the laser transmissive pressing member and the laser irradiating means are overlapped, and the laser transmissive member is formed with a uniform thickness. In the laminated secondary battery manufacturing apparatus according to any one of claims 3 to 6,
An apparatus for manufacturing a laminate type secondary battery, wherein the pressing member is partly cut or formed with a groove having a predetermined depth. In the laminated secondary battery manufacturing apparatus according to any one of claims 3 to 6,
The laser transmissive pressing member is formed wider than the laser irradiation means placed thereon and is supported by a portion protruding from the laser irradiation means, or the pressing means at a portion protruding from the laser irradiation means A device for manufacturing a laminate type secondary battery, wherein the force from the power is transmitted. In the laminated secondary battery manufacturing apparatus according to any one of claims 3 to 8,
The apparatus for manufacturing a laminated secondary battery, wherein the laser transmissive pressing member is formed of a laser transmissive glass.

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