Device and method for producing electrode stacks

Abstract

The invention relates to a stacking device and a method for stacking flat materials, e.g. electrodes having a separation film (1) interposed in a zigzag manner by means of a guiding device (8). The stacking device comprises a stacking table (11), a holder (4; 5) for immobilizing the stack, and grippers (6, 7) for picking the electrodes (2, 3) up and putting them down in a defined manner, said grippers having an excess pressure module (9) for the targeted shaping of a defined film pocket (17) in the separation film (1).

Claims

1. A device for producing electrode stacks having positive and negative electrodes (2, 3) and interposed separation film (1), to be arranged by means of a zig-zag folding, having at least one guiding device (8) for feeding the separation film (1) from an endless roll, having a stacking table (11) for receiving the electrode stack and at least one gripper (6, 7) for picking up and putting down the electrodes (2, 3), characterized in that an excess pressure module (9) is arranged at the gripper (6, 7) for generating a directed gas flow (10) such that the gas flow (10) exiting from the excess pressure module (9) forms a film pocket (17) through the redirection of the separation film (1), and that holders (4, 5) are arranged on each side of the stacking table (11), wherein a holder (4, 5) serves for the purpose of immobilizing the formed film pocket (17).

2. The device for producing electrode stacks according to claim 1, characterized in that the holders (4, 5) have at least the same width as the separation film (1).

3. The device for producing electrode stacks according to claim 1, characterized in that the gripper (6, 7) is implemented narrower than the electrodes (2, 3) to be picked up and put down, and an overhang (18) of the electrodes (2, 3) arises.

4. The device for producing electrode stacks according to claim 1, characterized in that the guiding device (8) can be movable alternatingly.

5. The device for producing electrode stacks according to claim 1, characterized in that the gas flow (10) is an air flow, preferably cleaned and ionized.

6. The device for producing electrode stacks according to claim 1, characterized in that the gripper (6, 7) is arranged parallel to the stacking table (11).

7. The device for producing electrode stacks according to claim 1, characterized in that the gripper (6, 7) is arranged inclined, wherein the lowest point of the incline is located in the direction of the pocket (17) forming in the separation film (1).

8. The device for producing electrode stacks according to claim 1, characterized in that the holders (4, 5) can be moved in the x-z planes to the stacking table (11).

9. The device for producing electrode stacks according to claim 1, characterized in that the separation film (1) can be immobilized at a fixing point (13) by means of the guiding device (8).

10. The device for producing electrode stacks according to claim 1, characterized in that a low pressure module (15) for further shaping of the film pocket (1) is arranged beneath the holder (4, 5).

11. The device for producing electrode stacks according to claim 1, characterized in that the holders (4, 5) are provided on the inside facing toward the separation film (1), with redirection rollers (19) for supporting the folding of the separation film (1).

12. The device for producing electrode stacks according to claim 1, characterized in that an outflow nozzle (20) for a gas flow (21) is provided on the inside of each holder (4, 5) facing toward the separation film (1), wherein the gas flow (21) supports the folding of the separation film (1) due to the effects thereof.

Description

(1) The subject matter of the invention is described in the following in more detail using the FIGS. 1 to 8, without limiting the invention to the types of embodiments shown there as an example.

(2) The figures show:

(3) FIG. 1 a representation in principle of the device according to the invention in the situation of putting down the first electrode 2,

(4) FIG. 2 the device after putting down the first electrode, during turning over the separation film 1 (with immobilized first electrode 2),

(5) FIG. 3 a representation in principle of the device according to the invention in the situation of putting down the second electrode 3,

(6) FIG. 4 the device after putting down the second electrode 3, during turning over the separation film 1 onto the other side (with immobilized first and second electrode 2, 3),

(7) FIG. 5 a representation in principle of the device according to the invention in the situation of putting down the third electrode 2,

(8) FIG. 6 design of the device according to the invention with support of the turning over and folding of the separation film 1 from outside by means of a low pressure module 9 at the holders 4, 5,

(9) FIG. 7 the device with support of the turning over and folding of the separation film 1 by means of a gas flow 21 from outflow nozzles 20 at the holders,

(10) FIG. 8 the device with support of the turning over and folding of the separation film 1 by means of redirection rollers 19 at the holder 4, 5.

(11) According to FIG. 1, a holder 5 according to the invention initially immobilizes the start of the separation film 1 on the stacking table 11 while a gripper 6 places an electrode 2, removed from a supply stack of electrodes, not shown in more detail, onto the separation film 1 on the stacking table 11. The gripper 6 for handling the electrodes can be, for instance a typical suction gripper.

(12) An excess pressure module 9 according to the invention is arranged at the gripper 6 laterally in the direction of the supplied separation film 1. A film pocket 17 is formed where the fold of the separation film 1 is to be attained with the help of a gas flow 10 out of the excess pressure module 9 arranged at the gripper 6. The feeding of the separation film 1 from a supply roll, not shown in more detail, to the guiding device 8 is realized in a customary manner. The drive technology with drive rolls, tension rollers, idle rollers, redirection rollers, required for this purpose is technically conventional and is not described specifically.

(13) FIG. 2 shows the device after putting down the first electrode 2 during turning over the separation film 1 (with immobilized first electrode 2).

(14) After the holder 4 has immobilized the folded separation film 1 on the electrode 2, the electrode 2 is covered with the separation film 1 with the help of the guiding device 8 moved on the left side. The holder 5 exposes the region for forming a new film pocket 17.

(15) As shown in FIG. 3, in a mirror-image to FIG. 1, a further electrode 3 is put down on the stack by means of a gripper 7, and in doing so a new film pocket 17 is formed for the wrapping of the separation film 1.

(16) Advantageously, during positioning and putting the electrodes 2, 3 down, the gripper 6, 7 with the retained electrode 2, 3 is inclined slightly laterally in the direction of the film pocket 17, in order to attain an improved positioning in the region of the forming film pocket 17, and to avoid a collision of the electrode 2, 3 with the holder 4, 5 lying opposite (shown in FIGS. 1 and 5).

(17) Further, in the device according to the invention, the width of the gripper 6, 7 is formed such that an overhang 18 of the electrode 2, 3 arises in the direction of the film pocket 17 and in the opposite direction, that is, the electrode 2, 3 extends beyond the gripper 6, 7. The size of the film pocket 17 formed depends on the free separator length between the fixed points 13 on the guiding device 8 and 14 on the holder 4, 5.

(18) As shown in FIG. 4, after putting the electrode 3 down onto the electrode stack, the holder 5 located over the formed film pocket 17 immobilizes the electrode stack, including the newly put down electrode 3 and the last formed film pocket 17 of the separation film 1. The opposite holder 4 is moved into a rest position outside of the stacking table 11. For the next electrode to be put down, after removing the grippers 6, 7 out of the putting down area over the electrode stack, the separation film 1 is guided onto the other side of the stacking table 11 by means of the guiding device 8.

(19) FIG. 5 shows the placement of the next electrode 2, wherein again using the gas flow 10 out of the excess pressure module 9 located on the gripper 6, the next film pocket 17 is formed of the separation film 1.

(20) In a further embodiment of the invention shown in FIG. 6, a low pressure module 15 is arranged beneath the holder 4, 5. The low pressure module 15 advantageously serves for further forming the film pocket 17, wherein a suction nozzle 22 is arranged at the low pressure module 15 in the direction of the film pocket 17 to be formed.

(21) FIG. 7 shows an embodiment of the invention in which the film folding is supported by a gas flow 21 out of an outflow nozzle 20 at the holders 4, 5.

(22) FIG. 8 shows an embodiment of the invention in which the holders 4, 5 are equipped with redirection rollers 19 for gentle placement onto the electrode stack.

REFERENCE LIST

(23) 1 separation film

(24) 2 electrode

(25) 3 electrode

(26) 4 right holder

(27) 5 left holder

(28) 6 gripper, excess pressure module, right

(29) 7 gripper, excess pressure module, left

(30) 8 guiding device

(31) 9 excess pressure module with outflow nozzle

(32) 10 gas flow

(33) 11 stacking table

(34) 12 movement direction of the guiding device

(35) 13 immobilizing point of the film guide

(36) 14 immobilizing point of the holder

(37) 15 low pressure module

(38) 16 feeding of separation film

(39) 17 film pocket

(40) 18 overhang of the electrodes

(41) 19 redirection roller at the holder

(42) 20 outflow nozzle at the holder

(43) 21 gas flow out of the holder

(44) 22 suction nozzle