JP3471764B2 - Method for manufacturing lithium battery element - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a lithium battery element.

[0002]

2. Description of the Related Art In a lithium battery element, a positive electrode sheet and a negative electrode sheet, which are formed to extend in substantially the same strip shape, are stacked with a separator interposed therebetween, and the positive electrode sheet, the negative electrode sheet and the separator are extended in the extending direction. It is manufactured by forming an electrode laminated body, which is formed into a cylindrical shape having an elliptical cross section by rolling, into a flat shape. The conventional method for manufacturing a lithium battery element is as follows. Step 1) The electrode laminate having the elliptical cross section is placed in a molding recess formed in a plurality of aluminum plates. Step 2) The aluminum plate on which a plurality of electrode laminates are set is put in a vinyl bag, and air is blown from the opening of the vinyl bag so that the electrode laminate does not come off from the aluminum plate in the vinyl bag. And then the opening of the vinyl bag is closed by heat welding. In addition, putting the electrode laminate in the vinyl bag is
When the electrode laminate is heated and pressed in step 3 described below,
This is to prevent it from adhering to the upper mold. Step 3) A vinyl bag containing the electrode laminate is placed on the surface of the lower mold of the press machine. The upper and lower molds of the pressing device are flat and equipped with a heater and a thermocouple inside.
It is heated to a constant temperature between ° C and 120 ° C. The pressing device is provided with a stopper so that when the size between the upper and lower dies becomes constant during pressurization, further pressurization is not possible. Step 4) The electrode laminate is molded into a flat shape by pressing the vinyl bag containing the electrode laminate while heating with the pressing device for a certain period of time. Step 5) A vinyl bag containing the electrode laminate is placed on the surface of the lower mold of a pressing device different from the pressing device. The upper and lower dies of this pressing device have a flat surface and cooling air is passed through the inside of the dies, and the electrode laminate formed in step 3 is pressed for a certain period of time so that the electrode laminate is 40 It is cooled below ° C so that the formed shape does not return to the original cylindrical shape. Step 6) The vinyl bag is broken and the flatly laminated electrode laminate is taken out.

[0003]

As described above, the conventional manufacturing is performed.
In the method , there is a problem that it takes time to set the electrode laminated body in the vinyl bag, suck out air, take out the bag by breaking it, and increase the manufacturing cost. The present invention has been made to solve the above conventional problems, and an object of the present invention is to provide a method for manufacturing a lithium battery element, which can shorten the manufacturing time and reduce the manufacturing cost.

[0004]

In order to achieve the above-mentioned object, the manufacturing method of the present invention is such that a positive electrode sheet and a negative electrode sheet which are formed in a strip shape are superposed with a separator interposed therebetween, and the positive electrode sheet, the negative electrode sheet and the separator are laminated. In a method for manufacturing a lithium battery element, in which an electrode laminate having an oval-shaped cross section is formed by rounding and in an extending direction, an upper mold having a pressing surface, A heating and pressurizing device having a lower die having a mounting surface and configured to move the upper die and the lower die in a vertical direction so as to come in contact with and separate from each other in a heated state, and a molding concave portion which is open upward. There is provided a mold that is placed on the mounting surface before formed in plurality, a first transfer device and for conveying the mold to the outside of the lower mold, the heating and pressing device
According to the above, the electrode laminated body housed in each forming recess of the forming die placed on the placing surface is heated and pressed by the upper die and the lower die to form the electrode laminated body into a flat shape.
Then , before the transfer of the mold by the first transfer device,
Applying a force in a direction orthogonal to the up-down direction to the portion of the forming die by the first conveying device in a state where the upper die and the lower die formed by flattening the electrode laminated body are slightly separated from each other. in, characterized in that the electrode laminate adhered to the pressing surface of the upper mold was set to disconnect from the pressurized pressure surface.

According to the present invention, the electrode laminate housed in each of the molding recesses of the molding die placed on the mounting surface is pressed by the upper die and the lower die while being heated. The laminated body is formed into a flat shape. Then, before the forming die is conveyed by the first conveying device, the electrode die is formed into a flat shape with a slight gap between the upper die and the lower die. By applying a force in a direction orthogonal to the vertical direction by the first transport device, the electrode stack attached to the pressing surface of the upper die is separated from the pressing surface. Therefore, the electrode laminate attached to the upper die is reliably released from the attachment to the upper die and is housed in the forming die.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a method for manufacturing a lithium battery element according to the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment of the present invention applied.
FIG. 2 is a perspective view showing a configuration of the manufacturing apparatus, FIG. 2 is an explanatory view showing a manufacturing procedure of the electrode laminate, and FIG. 3 is a perspective view of a molding die. First, an outline of a procedure for manufacturing a lithium battery element will be described with reference to FIG. As shown in FIGS. 2A and 2B,
The positive electrode sheet 51 and the negative electrode sheet 52, which are formed in a strip shape, are stacked with the separator 53 interposed therebetween. Then, FIG.
As shown in (C1) and (C2), these positive electrode sheets 5
By rolling the No. 1, the negative electrode sheet 52, and the separator 53 in the extending direction, the electrode laminated body 54 having an oval cross section is formed. Then, as shown in FIG. 2 (C3), the electrode laminated body 54 is molded into a flat shape to form an electrode laminated body 55.
(Lithium battery element) is obtained. The method for manufacturing a lithium battery element according to the present invention includes, in the above-described steps, the electrode laminate 54.
The those pertaining to a step of molding into a flat shape.

As shown in FIG. 1, the first embodiment is suitable.
The manufacturing apparatus 1 for a used lithium battery element has a base 102.
, Supply device 2, preheating device 3, and heating / pressurizing device 4
The cooling and pressurizing device 5, the transfer 40 (first transfer device), the molding die 60, the start switch 10, and a control mechanism (not shown).

As shown in FIG. 3, the molding die 60 is composed of a metal plate 61, an aluminum plate 62, and a plurality of molding recesses 63. The metal plate 61 has a rectangular plate shape. The aluminum plate 62 is fixed to the upper surface of the metal plate 61, has a thickness, and is formed in a rectangular plate shape smaller than the metal plate 61. The molding recesses 63 have a rectangular shape in a plan view, penetrate the aluminum plate 62 in the thickness direction, and are arranged side by side at equal intervals in the vertical and horizontal directions. That is, the molding recesses 63 are formed by being opened upward on the upper surface of the aluminum plate 62, and the aluminum plate 62 is fixed to the upper surface of the metal plate 61, so that the molding recesses 63 are formed.
The bottom part of is closed by the metal plate 61. Each of the molding recesses 63 is configured to accommodate one of the electrode laminated bodies 54, and the electrode laminated body 54.
While being accommodated in the molding recess 63, a portion of the electrode laminate 54 is configured to project upward from the upper surface 6202 of the aluminum plate 62. Further, the dimension of each of the molding concave portions 63 in the depth direction is configured to be smaller than the dimension of the flat electrode-shaped electrode laminate 55 in the thickness direction.

As shown in FIG. 1, the base 102 is provided with a rectangular plate-shaped upper plate 104, and on the upper plate 104, the supply device 2, the preheating device 3, and the heating / pressurizing device 4 are provided. A cooling and pressurizing device 5 and a start switch 10 are provided,
The transfer 40 is disposed below the upper plate 104.

The supply device 2 includes a mold detection sensor (not shown) for detecting the mold 60 set in the supply device 2, and a pneumatic cylinder 11 for supplying the mold 60 to the preheating device 3. It has and.

The preheating device 3 includes a molding die detection sensor (not shown), an upper die 12, a lower die 13, and a heater 14.
, Thermocouple 15, temperature controller 16, pneumatic cylinder 17,
And a cylinder holding member 18. The upper die 12 and the lower die 13 are configured to be movable in the vertical direction in which they come into contact with and separate from each other. The molding die detection sensor (not shown) is the lower die 13
It is provided on the upper plate 104 so as to detect the molding die 60 set on the above. The heater 14 and the thermocouple 15 are provided in the upper mold 12 as well as in the lower mold 13. The temperature controller 16 is provided on the base 102 and controls the heaters 14 based on the temperatures detected by the thermocouples 15, and the surface temperature of the upper mold 12 and the lower mold 13. Is controlled to a constant value in the range of 40 ° C to 100 ° C. The pneumatic cylinder 17
Is for moving the upper die 12 in the vertical direction with respect to the lower die 13. The cylinder holding member 18 is provided on the upper plate 104 and is configured to hold the pneumatic cylinder 17.

The heating / pressurizing device 5 includes an upper mold 20, a lower mold 21, a hydraulic cylinder 22, a heater 23, a thermocouple 24, a temperature controller 25, a stopper block 26, and an intermediate sensor 27. , And a cylinder holding member 28.
The upper mold 20 has a pressing surface, and the lower mold 21 has a mounting surface. The upper mold 20 and the lower mold 21 have a rectangular shape in a plan view and are configured to be movable in the vertical direction in which they come in contact with and separate from each other. The heater 23 and the thermocouple 24 are provided in the upper mold 20 while being built in the lower mold 21.
It is also built in. The temperature controller 25 is provided on the base 102 and controls each heater 23 based on the temperature detected by each thermocouple 24. The surface temperature of the upper mold 20 and the lower mold 21 is controlled by the temperature controller 25. 40 ° C ~ 1
It is configured to control to a constant value in the range of 00 ° C.

The hydraulic cylinder 22 moves the upper die 20 in the vertical direction with respect to the lower die 21. The stopper block 26 is provided on the upper plate 104 so as to abut two points on the diagonal line of the upper mold 20,
When the distance between the upper die 20 and the lower die 21 reaches a predetermined set dimension, the upper die 20 and the lower die 21 are brought into contact with each other so that they do not come closer to each other than the set dimension. The intermediate sensor 27 is provided on the upper plate 104, and is configured to detect that the upper die 20 is lifted to a position slightly separated from the lower die 21. The cylinder holding member 28 is provided on the upper plate 104 and is configured to hold the hydraulic cylinder 22.

The cooling / pressurizing device 5 includes an upper die 30, a lower die 31, a hydraulic cylinder 32, and a stopper block 33.
, An intermediate sensor 34, and a pneumatic cylinder 35 (second transfer device). The upper mold 30 has a pressing surface, and the lower mold 31 has a mounting surface. These upper molds 3
The 0 and the lower mold 31 have a rectangular shape in a plan view and are configured to be movable in the vertical direction in which they approach and separate from each other. An air flow passage (not shown) is formed in the upper mold 30 and the lower mold 31,
Compressed air supplied from a compressed air supply source (not shown) blows out between the upper mold 30 and the lower mold 31 through the air flow passage so that the molding mold is positioned above the lower mold 31. 6
It is configured to cool the electrode stacks 65 housed in 0.

The hydraulic cylinder 32 moves the upper die 30 in the vertical direction with respect to the lower die 31, and is held by the cylinder holding member 28. The stopper block 33 is provided on the upper plate 104 so as to come into contact with two locations on the diagonal line of the upper die 30, and when the distance between the upper die 30 and the lower die 31 becomes a predetermined set dimension. By contacting the upper mold 30, these are prevented from approaching each other by the set dimension or more. The intermediate sensor 34 is provided on the upper plate 104 and includes the upper mold 30.
Is elevated to a position slightly separated from the lower die 31. The pneumatic cylinder 35 is provided on the upper plate 104, and applies a force in a direction orthogonal to the vertical direction to a portion of the molding die 60 on the lower die 31 to move the molding die 60 to the lower die. It is configured to move to the outside of 31, that is, toward the discharge position 6.

The preheating device 3, the heating / pressurizing device 4, and the cooling / heating device 5 are arranged in a straight line.
The transfer 40 is a transfer body 400.
2, the first holding member 4008, and the second holding member 4012
And pneumatic cylinders 41 and 42. The transfer body 4002 is arranged below the preheating device 3, the heating / pressurizing device 4, and the cooling / heating device 5. The transfer body 4002 connects two horizontal columns 4004 that extend along the arrangement direction of the preheating device 3, the heating / pressurizing device 4, and the cooling / heating device 5 and are arranged at intervals. It is composed of a connecting member 4006. A lower end of the first holding member 4008 is attached to each of the horizontal columns 4004, and an upper end of the first holding member 4008 is formed in the molding die 6.
It is composed of four columns 4010 provided so as to hold the portions near the four corners of the zero metal plate 61. Similarly, the lower ends of the second holding members 4012 have the horizontal pillars 400.
4 struts 4 attached to 4 and provided so that the upper ends hold the portions near the four corners of the metal plate 61 of the molding die 60.
010.

The pneumatic cylinder 41 is provided on the base 102 so as to move the transfer body 4002 in the vertical direction by, for example, 1 mm. The pneumatic cylinder 42 is provided on the base 102 so as to reciprocate the transfer body 4002 in the horizontal direction. That is, the pneumatic cylinder 42 moves the molding die 60 held by the first holding member 4008 from the position of the preheating device 3 to the position of the heating / pressurizing device 4 and, at the same time, moves the second holding member. The mold 60 held by the member 4012 is configured to be moved from the position of the heating / pressurizing device 4 to the position of the cooling / pressurizing device 5. Further, the pneumatic cylinder 42 is configured to move the transfer main body 4002 in a direction opposite to the movement.

The control mechanism (not shown) uses the pneumatic cylinders 1 based on the detection results of the molding die detection sensors.
1, 17, 35, 41, 42 and the hydraulic cylinders 2
The control unit 2 and 32 are configured to include a timer for controlling the operating time of the pneumatic cylinder and the hydraulic cylinder. A preset time is preset in these timers. The start switch 10 is configured to input a signal instructing the control mechanism to start the operation of the manufacturing apparatus.

Next, the operation of the manufacturing apparatus 1 to which the first embodiment is applied will be described with reference to the flowcharts of FIGS. 4 and 5. First, the manufacturing apparatus 1 is turned on, and the upper and lower heaters of the preheating device 3 and the heating / pressurizing device 4 are operated to raise the temperature to the temperature set by the temperature controller ( Step 10). When the electrode stack 54 is set on the mold 60 (step 12), the mold 60 on which the electrode stack 54 is set is set on the supply device 2 (step 14), and the start switch 10 is pressed, The automatic operation of the manufacturing apparatus 1 starts (step 16).

When the forming die detection sensor of the supplying device 2 detects the forming die 60, the supplying device 2
Pneumatic cylinder 11 pushes the mold 60 and sets it on the mounting surface of the lower mold 13 of the preheating device 3 (step 18), and the pneumatic cylinder 11 returns to its original position (step 20). . Next, the pneumatic cylinder 17 is operated to lower the upper die 12 to be positioned above the electrode laminated body 54, and the pressing surface of the upper die 12 is stopped at a position separated from the upper surface of the electrode laminated body 54 by several mm. Yes (Step 2
2). The timer of the preheating device 3 is started (step 24). When the set time set in the timer is exceeded, the pneumatic cylinder 17 is operated to raise the upper die 12 (step 26). This allows
The electrode laminates 54 set in the molding die 60 are heated by the upper die 12 and the lower die 13 for a certain period of time at a certain temperature. This completes the preheating step.

Pneumatic cylinder 4 of the transfer 40
1 is operated to move the molding die 60 to the first holding member 400.
It is held by 8 and raised by 1 mm from above the lower mold 13 (step 28). Then, the transfer 40
The pneumatic cylinder 42 is operated to move the molding die 60 from above the lower die 13 to above the mounting surface of the lower die 21 of the heating and pressurizing device 4 (step 30), and the pneumatic cylinder 41 is moved. It is operated to lower the forming die 60 by 1 mm and place it on the placing surface of the lower die 21 (step 32). Then, the pneumatic cylinder 42 of the transfer 40 is operated to return the transfer body 4002 to the original position (step 34).

The mold 6 moved to the mounting surface of the lower mold 21 by the mold detection sensor of the heating and pressurizing device 4.
When 0 is detected, the hydraulic cylinder 22 is operated,
By lowering the upper mold 22, heating and pressurization of the electrode laminate 54 housed in the molding mold 60 is started (step 3
6) Then, the timer of the heating / pressurizing device 4 is started (step 38). When the set time set in the timer is exceeded, the hydraulic cylinder 22 is actuated to start raising the upper die 20 (step 40). On this occasion,
Since the upper die 20 abuts on the stopper block 23, the electrode laminated body 54 has a certain time between the pressing surface of the upper die 20 and the bottom of the molding recess 63 of the molding die 60.
It is heated at a constant temperature and pressurized at a constant pressure. As a result, the electrode laminated body 54 becomes an electrode laminated body 55 formed in a flat shape. This completes the heating and pressurizing step.

When the intermediate sensor 24 detects the upper die 20, the hydraulic valve of the hydraulic cylinder 22 is switched to stop the flow of oil and stop the rising of the upper die 20 (step 42). Thereby, the upper mold 20
Is stopped at an intermediate stop position slightly separated from the lower mold 21 (for example, about 2 mm to 3 mm). When the electrode laminated body 55 adheres to the pressing surface of the upper mold 20, the electrode laminated body 55 adhered to the upper mold 20 enters the molding concave portion 63 of the molding die 60 at the intermediate stop position, for example, in the thickness direction. Half the part remains. Next, the pneumatic cylinder 41 of the transfer 40 is operated to raise the molding die 60 by 1 mm while being held by the second holding member 4012 (step 44).
In this state, the portion of the electrode laminate 55 remains in the molding recess 63 of the molding die 60.

Then, the pneumatic cylinder 42 is operated to convey the molding die 60 held by the second holding member 4012 along the horizontal direction to the mounting surface of the lower die 31 of the cooling / pressurizing device 5 ( Step 46). Here, before the molding die 60 is conveyed to the mounting surface of the lower die 31 of the cooling / pressurizing device 5 by the second holding member 4012, the molding die 6 is formed.
0, a force in a direction orthogonal to the moving vertical direction of the upper die 20 is applied by the second holding member 4012, so that the electrode stack 55 attached to the pressing surface of the upper die 20 is A force in the shearing direction is applied from the portion (side surface) of the molding recess 63 of the molding die 60 to separate the adhesion from the pressing surface, and the molding die 63 is accommodated in the molding recess 63. Then, the molding die 60 is removed by the second holding member 4012.
Are conveyed to the mounting surface of the lower mold 31 of the cooling and pressurizing device 5. Next, the pneumatic cylinder 4 of the transfer 40
1 is operated to move the molding die 60 to the second holding member 40.
The lower mold 31 is lowered by 1 mm while being held by 12.
It is placed on the placing surface of (step 48). Next, the pneumatic cylinder 42 of the transfer 40 is operated to return the transfer body 4002 to the original position (step 50).

Next, when the molding die detection sensor of the cooling / pressurizing device 5 detects the molding die 60 moved to the mounting surface of the lower die 31, the hydraulic cylinder 32 is actuated to move the upper die. By lowering the mold 30, the molding mold 60
The cooling / pressurization of the electrode laminated body 55 housed in (1) is started (step 52) and the timer of the cooling / pressurizing device 5 is started (step 54). When the set time set in the timer is exceeded, the hydraulic cylinder 32 is operated to start the lifting of the upper mold 30 (step 56). At this time, since the upper die 30 contacts the stopper block 33, a constant pressure is applied to the electrode laminated body 55. As a result, the electrode laminate 55 is cooled by the compressed air blown from the upper mold 30 for a certain period of time between the pressing surface of the upper mold 30 and the bottom of the molding recess 63 of the molding mold 60. , Pressurized with a constant pressure. As a result, the electrode laminate 55 is surely molded into a flat shape without returning to the state before the heating and pressing step. This completes the cooling / pressurizing step.

When the intermediate sensor 34 detects the upper mold 30, the hydraulic valve of the hydraulic cylinder 32 is switched to stop the flow of oil and stop the rising of the upper mold 30 (step 58). Thereby, the upper mold 30
Is stopped at an intermediate stop position slightly separated from the lower mold 31 (for example, about 1 mm to 2 mm). When the electrode laminate 55 adheres to the pressing surface of the upper die 30, the electrode laminate 55 attached to the upper die 30 is approximately half in the thickness direction in the molding recess 63 of the molding die 60 at the intermediate stop position. Remains.

Next, the pneumatic cylinder 35 is operated,
The molding die 60 is installed in the cooling / pressurizing device 5 along the horizontal direction.
The lower die 31 is conveyed to the discharge position 6 from above the mounting surface (step 60). Here, before the molding die 60 is conveyed to the discharge position 6 by the pneumatic cylinder 35, the molding die 60 receives a force in a direction orthogonal to a vertical direction in which the upper die 30 moves. Since the pressure is applied by the pressure cylinder 35, the electrode laminated body 55 adhering to the pressing surface of the upper die 30 has the molding recess 63 of the molding die 60.
By receiving a force in the shearing direction from the portion (side surface), the attachment to the pressing surface is separated, and it is housed in the molding recess 63. Then, the molding die 60 is conveyed to the discharge position 6 by the pneumatic cylinder 35. This completes the cooling / pressurizing step. The electrode laminates 55 housed in the molding die 60 pushed to the discharging position 6 are taken out at the discharging position 6. The mold 60 emptied here is set by the operator to the base 1
02 is slid on the upper plate 104 and fed to the front of the supply device 2, and the unprocessed electrode laminate 54 is set and supplied to the supply device 2.

According to the first embodiment detailed above,
When the electrode stack 54 is deformed, a plastic bag for preventing the electrode stack 54 from adhering to the upper mold is not required, so that the working time can be greatly reduced and the manufacturing cost can be reduced. Can be reduced.

Conventionally, in order to secure the number of processing of the heating / pressurizing device, the heating / pressurizing device has to be large in size. The apparatus for manufacturing the electrode stack 54 had to be installed in a separate place. Therefore, it is necessary to convey the electrode laminated body between the devices, and it takes a wasteful conveying time. However, according to the manufacturing method of the present embodiment, since the preheating is performed by the preheating device 3, the heating and pressing time for the electrode stack 54 by the heating and pressing device 4 is higher than that in the conventional case. Can be shortened. Therefore, the number of processings per unit time can be increased, so that the number of the electrode laminates to be simultaneously heated and pressed by the heating and pressing device 4 can be reduced as compared with the conventional case. That is, it is possible to reduce the number of the electrode laminated bodies to be placed on one molding die, so that the manufacturing apparatus 1 can be downsized. Therefore, the manufacturing apparatus 1 only needs to occupy the same space as one conventional heating / pressurizing apparatus or cooling / pressurizing apparatus. Therefore, the manufacturing apparatus 1 and the electrode laminate before being deformed 5
4 can be connected to a device for manufacturing with a single line, wasteful transfer processing can be eliminated, the number of workers for transfer can be reduced, and the manufacturing cost can be reduced. Further, in the present embodiment, since both the heating and pressurizing device 4 and the cooling and pressurizing device 5 are provided in the manufacturing apparatus 1, for example, the number of workers is 2 compared to the case where both are provided independently. The manufacturing cost can be reduced by reducing the number of people from one to one.

Next, a manufacturing apparatus 1A to which the second embodiment is applied will be described. FIG. 6 is a perspective view showing the configuration of a manufacturing apparatus to which the second embodiment of the present invention is applied . As shown in FIG. 6, the second embodiment differs from the first embodiment in that the supply device 2A is provided on the upper plate 104 of the base 102, and the first and second preheating devices are provided. 3a and 3b are provided, and the electrode stack 54 housed in the mold 60 is preheated twice.

The supply device 2A is provided with a pneumatic cylinder 9, and the pneumatic cylinder 9 is used to set the molding die 60 in the first preheating device 3a. The first preheating device 3a includes a molding die detection sensor (not shown),
The pneumatic cylinder 11, the upper mold 12a, the lower mold 13a, the heater 14a, the thermocouple 15a, the temperature controller 16a, the pneumatic cylinder 17a, and the cylinder holding member 18a are provided. The upper die 12a and the lower die 13a are configured to be movable in the up-and-down direction in which they come into contact with and separate from each other.

The molding die detection sensor (not shown) is the lower die 1
It is provided on the upper plate 104 so as to detect the molding die 60 set on the 3a. The heater 14
The a and the thermocouple 15a are provided inside the upper mold 12a and also inside the lower mold 13a. The temperature controller 16a is provided on the base 102 and controls each heater 14 based on the temperature detected by each thermocouple 15a.
a, the surface temperature of the lower mold 13a is controlled to be a constant value in the range of 40 ° C to 100 ° C. The pneumatic cylinder 17a moves the upper die 12a in the vertical direction with respect to the lower die 13a. The cylinder holding member 18a is provided on the upper plate 104 and is configured to hold the pneumatic cylinder 17a.

The second preheating device 3b is provided adjacent to the preheating device 3a. The second preheating device 3b includes a molding die detection sensor (not shown) and an upper die 12
b, lower mold 13b, heater 14b, thermocouple 15b
And a temperature controller 16b, a pneumatic cylinder 17b, and a cylinder holding member 18b. The upper mold 12b and the lower mold 1
3b is configured to be movable in the up-and-down direction so as to approach and separate from each other.

The molding die detection sensor (not shown) is the lower die 1
It is provided on the upper plate 104 so as to detect the molding die 60 set on the 3b. The heater 14
The b and the thermocouple 15b are provided in the upper mold 12b as well as in the lower mold 13b. The temperature controller 16b is provided on the base 102 and controls each heater 14b based on the temperature detected by each thermocouple 15b.
b, the surface temperature of the lower mold 13b is controlled to be a constant value in the range of 40 ° C to 100 ° C. The pneumatic cylinder 17b moves the upper die 12b in the vertical direction with respect to the lower die 13b. The cylinder holding member 18b is provided on the upper plate 104 and is configured to hold the pneumatic cylinder 17b.

Next, the operation will be described. When the molding die 60 on which the electrode laminate 54 is set is set in the supply device 2A and the start switch 10 is pressed, the molding die detection sensor of the supply device 2 detects the molding die 60,
In the pneumatic cylinder 9, the lower mold 13 of the preheating device 3a is
Set on a. When the forming die detection sensor of the preheating device 3a detects the forming die 60, the pneumatic cylinder 9 returns to the original position, the pneumatic cylinder 14a descends, and the lower surface of the upper die 12a is the electrode laminated body. Stop at a position several mm away from the upper surface of 54, and start preheating. First
When heated at a constant temperature for a certain period of time as in the above embodiment, the pneumatic cylinder 14a raises the upper mold 12a and the preheating by the preheating device 3a is completed.

Next, the molding die 60 is set on the lower die 13b of the second preheating device 3b by the pneumatic cylinder 11. When the forming die detection sensor of the preheating device 3b detects the forming die 60, the pneumatic cylinder 11 returns to the original position, the pneumatic cylinder 14b descends, and the lower surface of the upper die 12b is the electrode laminated body. Stop at a position several mm away from the upper surface of 54, and start preheating. Similar to the first preheating device 3a, when heated at a constant temperature for a certain time, the upper die 12 is heated by the pneumatic cylinder 14b.
b rises, and the preheating by the preheating device 3b ends. The subsequent operation is similar to that of the first embodiment.

According to the second embodiment, in addition to the effect of the first embodiment, the preheating is performed twice, so that a longer time is required as compared with the case of the first embodiment. ,
Since each of the electrode laminates 54 can be heated, the heating / pressurizing time in the heating / pressurizing device 4 can be further shortened, and the manufacturing time for each electrode laminate 54 can be shortened. There is an effect.

[0038]

As described above, according to the method of manufacturing a lithium battery element of the present invention, the electrode laminate is formed into a flat shape before the forming die is conveyed by the first conveying device. With the space between the mold and the lower mold slightly separated,
By applying a force in a direction perpendicular to the vertical direction to the portion of the molding die by the first transfer device, the electrode stack adhered to the pressing surface of the upper die is separated from the pressing surface. Therefore, the electrode laminate attached to the upper mold is surely released from the attachment to the upper mold, and is accommodated in the forming die. Therefore, a vinyl bag for preventing the electrode laminate from attaching to the upper mold. Is unnecessary, the working time can be significantly reduced, and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a manufacturing apparatus to which a first embodiment of the present invention has been applied .

FIG. 2 is an explanatory diagram showing a manufacturing procedure of an electrode laminated body.

FIG. 3 is a perspective view of a molding die.

FIG. 4 is an operation flowchart of the manufacturing apparatus to which the first embodiment of the present invention is applied .

FIG. 5 is a flowchart following FIG.

FIG. 6 is a perspective view showing a configuration of a manufacturing apparatus to which a second embodiment of the present invention has been applied .

[Explanation of symbols]

1, 1A ... Lithium battery element manufacturing device, 2, 2A ...
… Supply device 3, 3a, 3b …… Preheating device, 4 ……
Heating / pressurizing device, 5 ... Cooling / heating device, 40 ... Transfer, 60 ... Mold, 63 ... Molding recess.

Claims (11)

(57) [Claims] 1. An electrode having an oval cross section formed by stacking a strip-shaped positive electrode sheet and a negative electrode sheet on top of each other with a separator interposed therebetween, and rolling the positive electrode sheet, the negative electrode sheet, and the separator in the extending direction. In a method for manufacturing a lithium battery element in which a laminated body is molded into a flat shape, an upper mold having a pressing surface and a lower mold having a mounting surface are provided,
A heating and pressurizing device configured to move the upper mold and the lower mold in a vertical direction so as to come into contact with and separate from each other in a heated state, and a plurality of open molding concave portions are formed above and placed on the mounting surface. A forming die to be placed and a first conveying device that conveys the forming die to the outside of the lower die are provided , and each forming of the forming die placed on the placing surface by the heating and pressurizing device. said electrode stack housed in the recess under pressure while heated by the upper and lower molds to mold the electrode stack into a flat shape, before the transport of the mold by the first conveyor device, wherein By applying a force in the direction perpendicular to the vertical direction to the portion of the molding die by the first transfer device in a state where the upper die and the lower die formed by flattening the electrode laminate are slightly separated from each other. , Separating the electrode stack attached to the pressure surface of the upper mold from the pressure surface Was to way, the manufacturing method of a lithium battery cell, characterized in that. 2. When the upper die and the lower die of the heating and pressurizing device are slightly separated from each other, a part of the electrode laminate adhered to the pressurizing surface of the upper die is positioned in the molding recess. The method for manufacturing a lithium battery element according to claim 1, which is characterized in that. 3. A lithium battery device according to claim 1, characterized in that a smaller than the dimension in the thickness direction of the molded recess in the depth direction of the dimension the electrode laminate molded into a flat shape Manufacturing method . 4. A cooling / pressurizing device having an upper die having a pressing surface and a lower die having a mounting surface, and configured to move the upper die and the lower die in a vertical direction in which they come in contact with and separate from each other. And a second transfer device configured to transfer the molding die that houses the electrode laminate and is placed on the lower mold of the cooling and pressurizing device to the outside of the lower mold, the cooling pressure device,
Lithium battery element according to claim 1, wherein the cooling with pressurizing the electrode stack housed in the placed the mold on the mounting surface of the lower mold by the upper and lower molds Manufacturing method . 5. Before the molding die is conveyed by the second conveying device, the cooling pressurizing device is attached to the pressing surface of the upper mold with a slight gap between the upper mold and the lower mold. method for producing a lithium battery cell of claim 4, wherein the separating the electrode stack from the pressurized pressure surface has. 6. When the upper die and the lower die of the cooling and pressurizing device are slightly separated from each other, a part of the electrode laminate adhered to the pressurizing surface of the upper die is positioned in the molding recess. The method for manufacturing a lithium battery element according to claim 5, which is characterized in that. Wherein said mold, characterized in that the depth dimension of the forming recess is smaller than the thickness dimension after the electrode stack is pressurized by the cooling pressure device The method for manufacturing a lithium battery element according to claim 5. 8. The method for manufacturing a lithium battery element according to claim 4, wherein the cooling of the electrode stack by the cooling / pressurizing device is performed by blowing compressed air to the electrode stack. 9. provided preheating device for heating pre said electrode stack housed in the molding recess of the mold, the heating and pressurizing the electrode stack which is heated by the preheater together with the mold The method for manufacturing a lithium battery element according to claim 1, wherein the method is carried to an apparatus. 10. A first preheating device for heating the electrode laminate in a state where the electrode laminate is accommodated in a forming recess of the forming die, and the electrode laminate heated by the first preheating device. And a second preheating device for further heating the electrode stack, and the electrode laminate heated by the second preheating device is conveyed to the heating and pressurizing device together with the forming die. Manufacturing method of lithium battery element. 11. The method for manufacturing a lithium battery element according to claim 1, wherein the molding recess of the molding die has a rectangular shape in plan view.